IMPROVEMENTS RELATING TO THE CUTTING OF BRUSH VEGETATION

Abstract: A control assembly for a brush cutting machine is described, together with a method for controlling the movement of a blade assembly of a brush cutting machine. A flail cutter for a brush cutting machine and a method for providing the same are described, along with a blade assembly for a brush cutting machine and a method for cutting brush using the improved machine. A blade for a flail type brush cutting machine is described, as well as a method for producing such a blade.

Description: IMPROVEMENTS RELATING TO THE CUTTING OF BRUSH VEGETATION Field of the Invention The present invention relates to apparatus and methods for cutting brush vegetation. More particularly, the invention provides a control assembly and method, a flail cutter, a blade assembly and a flail blade for a brush cutting machine. Methods for providing and operating the apparatus are also provided. General Description of the Invention and Prior Art In conventional brush cutting technology, the boom of a standard brush cutting machine is located either to the side or the front of the cutting machine. A standard boom consists of two booms which appear as two arms of one boom. The first arm is located closest to the cutting machine and is fixedly attached thereto. The second arm is attached to the first arm and is called the dipper boom. In prior art blade assemblies for a brush cutting machine the blade is positioned at the distal end of the dipper boom. A conventional blade assembly is covered by a sheath which has an opening on its forward facing side. As the blades rotate the brush in front of the opening is cut. If the boom is turned the opening in the sheath moves, thus the blades opening would move away from the brush to be cut thereby cutting a narrower area. If the boom was rotated 90 degrees forwardly, the opening in the sheath would move such that the side of the sheath would replace the opening and the opening would move completely away from the brush and there would be no brush cut. In the prior art, the blade therefore can only be positioned at the side of the machine when cutting brush. So, in order to position the blade so that it is forward facing into the material to be cut, the prior art requires the physical movement of the machine to move the blade so that it will be presented in a proper cutting position to cut brush. It can be seen that this is a very labour intensive operation requiring much manoeuvring by the operator and considerable fuel consumption by the cutting machine with the required movement of the machine. Further, in the prior art, with the blade assembly attached directly to the distal end of the dipper boom, the blade assembly is rigid and flat against a ground surface that is most often not flat. It can be seen therefore, that in the prior art as the blade assembly moves evenly across the brush and the uneven ground that there will be an uneven cut of the brush, higher where there are depressions in the ground and lower where there is a raised area in the ground. Also, as the conventional rigid blade assembly strikes raised earth or large rocks there will be an abrupt jolt to the blade assembly and consequently to the cutting machine and machine operator. U.S. Patent 3,824,674 to Inoyama et al discloses an automatic assembly control for controlling a positioning mechanism in response to signals representative of the displacement or deflection of an elastic coupling means. U.S. Patent 4,414,750 to DeFazio discloses a remote center compliance device having two plates with elements interposed between, each element being axially compressible and laterally deformable. U.S. Patent 4,848,757 to DeFazio discloses a remote center compliance device having two plates with coil springs interposed there between for providing rotational and translational compliance. In order to overcome or at least alleviate problems inherent in the prior art there is provided in a first aspect of the present invention a rotating, floating and quick attaching control assembly enabling improvement in the general brush cutting operation. The rotating, floating and quick attaching control assembly of the present invention is located at the distal end of the second or dipper boom and is positioned between the dipper boom and the blade assembly. The control assembly of the present invention is used to control and attach a variety of blade assemblies such as a flail cutter, rotary blade assembly, etc. to the boom of a brush cutting machine. In this regard, the control assembly of the present invention functions as a coupling means serving to connect the blade assembly to the dipper boom of the cutting machine. The control assembly of the present invention includes a center mounting member for attaching the control assembly to the center of the blade assembly. The center mounting member serves to lift the blade assembly over rocks and debris and makes the control assembly more efficient by centering the control functions, the rotating and swivelling adjustment of the blade assembly, over the mechanism to be controlled. The control assembly of the present invention rotates at substantially 180 degrees allowing the control assembly to be rotated in the opposing direction of the boom thereby maintaining a forward facing cutter or blade position such that the blade is facing into the material to be cut. This is a substantial advantage over the prior art which only allows the blade to be at the side of the cutting machine. The rotating, floating control assembly of the present invention includes an upper rotation plate and a lower rotation plate having a plurality of coil springs therebetween. The upper and lower plates comprise the rotating means of the present invention. These two plates rotate together in the same direction around a 180 degree semicircular path at the distal end of the dipper boom. The rotating means of the present invention is caused to rotate by a hydraulic cylinder system but can be rotated by any suitable means. The coil springs comprise the adjusting means of the present invention and serve to adjust the vertical movement of blade assembly relative to the ground. The object of the springs is to change short abrupt jolts received from depressions and high spots on the ground into softer, smoother movements received by the brush cutting machine, to reduce wear and tear on the machine and the operator. In addition, the springs of the rotating, floating control assembly allow the blade of the brush cutting machine to follow the lay of the ground. This is particularly useful on uneven ground where most of the brush to be cut would be growing. There is thereby a closer cut of the brush and less stress on the machine and operator. The control assembly of the present invention also includes a combination angling and attaching means which allows the swivelling and angular movement of the control assembly to thereby control the swivelling and angular movement of the blade assembly. As an attaching means, the combination angling and attaching means serves as the center shaft member which holds the rotating and adjusting means together. The first angling end of the combination angling and attaching means includes a first right and second left generally semicircular plates having mating holes positioned therethrough for receiving a pin. The pin is positioned through the mating holes in the semicircular plates of the first angling end of the combination angling and attaching means and through a swivelling means thereby attaching the swivelling means between the first right and second left semicircular plates of the angling end of the combination angling and attaching means. The angling end of the combination angling and attaching means also comprises the swivelling means which is a generally ball shaped member and is attached to the lower rotation plate of the control assembly. The second shaft and attaching end of the combination angling and attaching means extends upward from the swivelling means, through the lower and upper surfaces of the upper rotation plate of the control assembly, through a first thrust bearing, the bushing which is attached to the dipper boom, and through a second thrust bearing whereupon it is secured with a bolted nut. The control assembly of the present invention also has a unique quick attachment means which is used to release and attach the rotating, floating control assembly to the dipper boom and to the blade assembly. The attachment means of the present invention includes a securing member which is attached to the top of the blade assembly. The bottom of the control assembly is configured to be in mating attachment with the securing member. The pins which are part of the attachment means are used to attach the bushing which is part of the top of the control assembly to the distal end of the dipper boom. The bottom surface of the lower rotation plate of the rotating, floating control assembly is positioned over the securing member and a centering pin on the bottom surface of the lower rotation plate of the control assembly is inserted into a centering hole in the securing member. Two straight sides on the securing member are configured to line up with two corresponding lines on the bottom surface of the lower rotation plate of the control assembly. When the rotating, floating control assembly and the securing member are joined together, the rotating means and consequently the lower rotation plate of the bottom of the control assembly is rotated 90 degrees in either direction thereby locking the securing member and the bottom of the control assembly together. This 90 degree rotation to lock the securing member and the bottom of the control assembly together is accomplished by the same hydraulic cylinder system which rotates the rotating means but can also be accomplished by other suitable means. The two securing pins are then inserted into any two of the securing holes, which are through both the lower rotation plate and the securing member. The aspect of the invention described above is defined in the appended claims. Specific features of those claims are noted and elaborated in the following Statements (a) to (r) : (a) The control assembly as defined in claim 1 may further comprise adjusting means positioned between the top and bottom of the rotating means for adjusting the vertical movement of the control assembly to thereby adjust the vertical movement of the blade assembly relative to the ground. (b) The control assembly as defined may further comprise a combination angling and attaching means for swivelling the control assembly to thereby adjust the angle of the blade assembly relative to the ground and for attaching the control assembly to the brush cutting machine. (c) The control assembly as defined may further comprise a center mounting member for mounting the control assembly over the center of the blade assembly. (d) The control assembly as defined may be such that the adjusting means comprises a plurality of coil springs adjustable on a vertical plane around an entire 360 degree circumferential path of the blade assembly. (e) The control assembly as defined may be such that the rotating means rotates the blade assembly at 360 or less degrees relative to the boom forming a 360 degree circumferential path of the blade assembly. (f) The control assembly as defined may further comprise releasible attachment means having a top and a bottom, the bottom of the attachment means being fixedly attached to the upper surface of the blade assembly, the top of the attachment means being releasibly attached to the bottom of the rotating means. (g) The control assembly as defined may be such that the bottom of the attachment means further comprises a securing means having a plurality of holes therein fixedly attached to the upper surface of the blade assembly and wherein the attachment means further comprises a mating securing receiver integral with the lower surface of the bottom of the rotating means; and whereby the lower surface of the bottom of the rotating means is attached to the blade assembly by rotating the rotating means in locking arrangement with the bottom of the attachment means. (h) The control assembly as defined may be such that the securing means comprises two straight sides which mate with two pre-determined corresponding lines on the bottom of the rotating means; and whereby the lower surface of the bottom of the rotating means is attached to the blade assembly by rotating the rotating means to thereby line up the two pre-determined straight lines on the bottom of the rotating means with the two straight sides of the securing means. (i) The control assembly as defined may be such that the attachment means further comprises at least one attaching bolt; and whereby the attachment means attaches the distal end of the boom to the upper surface of the top of the rotating means by securing at least one of the attaching bolts through one of the holes in the top of the attachment means. ( ) The control assembly as defined may be such that the control means is a hydraulic cylinder system. (k) The method for controlling the movement of a blade assembly of a cutting machine with the control assembly as defined in claim 2 may further comprise the steps of: a) providing an adjusting means positioned between the top and bottom of the rotating means; and b) adjusting the vertical movement of the control assembly to thereby adjust the vertical movement of the blade assembly relative to the ground. (1) The method for controlling the movement of a blade assembly of a cutting machine using the control assembly as defined may further comprise the steps of providing a combination angling and attaching means for swivelling the control assembly to thereby adjust the angle of the blade assembly relative to the ground and for attaching the control assembly to the brush cutting machine. (m) The method for controlling the movement of a blade assembly with the control assembly as defined may further comprise the step of: c) providing a center mounting member for mounting the control assembly over the center of the blade assembly. (n) The method for controlling the movement of a blade assembly of a cutting machine using the control assembly as defined may further comprise the step of c) providing the adjusting means comprising a plurality of coil springs. (o) The method for controlling the movement of a blade assembly of a cutting machine using the control assembly as defined may further comprise the steps of: c) providing a releasable attachment means having a first lower surface and a second upper surface; d) releasibly attaching the first lower surface to the top of the blade assembly using the releasable attachment means; and e) releasibly attaching the second upper surface to the bottom of the rotating means. (p) The method for controlling the movement of a blade assembly of a cutting machine using the control assembly as defined may further comprise the step of: d) providing a mating attaching receiver integral with the lower surface of the bottom of the rotating means; and whereby the lower surface of the bottom of the rotating means is attached to the blade assembly by rotating the rotating means in locking arrangement with the top of the attachment means. (q) The method for controlling the movement of a blade assembly of a cutting machine using the control assembly as defined may further comprise the steps of: d) providing at least one attaching bolt; e) providing two straight sides positioned on the releasable attachment means which line up with two predetermined straight lines on the bottom of the rotating means; and whereby the bottom of the rotating means is rotated to lock the attaching means to the bottom of the rotating means and secured by at least one attaching bolt. (r) The method for controlling the movement of a blade assembly of a cutting machine using the control assembly as defined may further comprising the step of: e) providing at least one attaching bolt; and whereby the attachment means attaches the distal end of the boom to the upper surface of the top of the rotating means by securing at least one of the attaching bolts through one of the holes in the top of the attachment means. A flail cutter is generally a shaft type cutter having a plurality of hangers welded around the outside perimeter of the shaft. A plurality of small blades are hooked onto the hangers by means of a bolt positioned through a pair of hangers, the bolt holding a ring which in turn holds a pair of blades. As the shaft is rotated and carried over the ground on a roller or skid shoes, the blades slash into the brush to be cut. A problem with the conventional prior art flail cutter is that it takes a very long time to replace these blades on the flail cutter. In the prior art, since each pair of blades is held in place by a pin or bolt, in order to change all the blades, scores of pins or bolts must be removed. This becomes very tedious as while the blades are in use, the nuts for the pins or bolts have become peened to a round shape and the pins or bolts have become bent. A socket wench does not work on these domed nuts so what would have been an arduous task becomes worsened by the time and effort spent trying to remove the damaged nuts and bolts that attach the blades to the shaft. The prior art also typically uses a V-belt drive system to power and rotate the shaft. These V-belts have a tendency to slip and/or break which causes much down time for the brush cutting machine and the operator. U.S. Patent 2,669,819 to Sawyer discloses a stalk shredder with hammers having independent lateral deflection to reduce breakage of the hammers. U.S. Patent 2,711,067 to Mott discloses a flail mower with the blades hung on C-rings. U.S. Patent 3,004,765 to Wilkes discloses beater chains that extend through holes in a cylindrical sleeve. A rod is located in the center of the sleeve. U.S. Patent 3,161,412 to Ferris discloses a spreader with flails driven by a tube that has notches that are engaged by clutch pins extending from a central shaft. U.S. Patent 3,167,318 to Ferris teaches flexible flails extending from a shaft and through a tube. The flexible flails are in the form of chains that are wound around the shaft, the chains unwinding during unloading of material. U.S. Patent 4,587,800 to Jimenez discloses a grass trimming and edging device which allows the motor to be mounted in two positions, one to present the cutting element in a substantially vertical plane and one to present the cutting element in a substantially horizontal plane. U.S. Patent 5,353,881 to Lee, et.al., discloses a twin shaft system for a lawn mower type device where each shaft rotates in opposite directions. In order to overcome or at least alleviate problems inherent in the prior art there is provided in a second aspect of the present invention an improved flail cutter for a brush cutting machine. Unlike the prior art, the flail cutter of the first preferred embodiment of this aspect of the present invention does not use any pins or bolts to hold the plurality of blades in place on the shaft. The flail cutter of the present invention uses a locking means in the form of an outer cylinder that is positioned over a long steel shaft to lock the blades in place. In the first preferred embodiment of this aspect of the present invention, hangers are inserted into mating holes cut in the long steel shaft and through a second plurality of mating holes in the outer cylinder. The hangers of the present invention are designed to receive a ring which holds a pair of blades back to back. The hangers are inserted into the holes in the outer cylinder and the shaft. After all the blades are installed on the hangers with the rings, the cylinder is slid across the long shaft, the cylinder having a very close inside and outside diameter tolerance with the shaft. This outer cylinder or sheath serves as the locking means for the blades. The sheath slides back and forth horizontally across the inner shaft. When the sheath is slid in one direction, the blades are locked in place and in the opposite direction the blades are released. So that after all the blades are installed on the hangers with the rings thereby attaching the blades to the shaft, the outer sheath is slid, thus locking all the blades in place. This results in a much quicker attachment of the blades as they become dulled thereby greatly decreasing maintenance time and expense. The plurality of blades can thus be changed in minimal time on the flail cutter of the present invention. In the second preferred embodiment of this aspect of the present invention, the hangers are bolted or otherwise suitably attached directly onto the shaft. The rings are inserted into the hangers in a manner similar to the first preferred embodiment, the rings holding a pair of blades back to back. When it is desired to change the blades in the second preferred embodiment, the bolts that attach the hangers to the shaft are unbolted, the pair of blades are remov: and new blades are replaced on the ring. The ring with the new blades is inserted into the hanger and the hanger is rebolted to the shaft. In the second preferred embodiment of this aspect of the present invention, the use of the outer sheath is eliminated as the hangers are attached directly to the outer perimeter of the shaft. This is an improvement over the prior art in that, by attaching the hangers directly onto the shaft with bolts that are perpendicular to the outer perimeter of the shaft and not facing parallel to the outer perimeter of the shaft, the bolt heads and nuts are not exposed to flying stones or debris that would peen and damage the nuts and bolts. Thus, the hangers and hence the blades. Are much easier to remove and re-attach. The flail cutter of the present invention also uses a chain drive system instead of a V-belt drive system employed by the prior art. Unlike the prior art, the chain drive system used with the present flail cutter does not use belts that can slip and/or break thereby increasing maintenance time and expense. The hydraulic motor used to power the flail cutter of the present invention is mounted on the housing of the chain drive system. This housing and hence the hydraulic motor is removable from the flail cutter so as to provide easy maintenance on the motor, sprockets and chain. It can also be removed and mounted on other flail cutters as an emergency replacement part. The housing of the chain drive system of the flail cutter is designed to provide an oil bath for the chain and sprocket to run in. This is accomplished by seals around both the motor shaft and the axle of the flail cutter and a gasket between the chain drive cover and the housing. The aspect of the invention described above is defined in the appended claims. Specific features of those claims are noted and elaborated in the following statements (a) to ( ) : (a) The flail cutter for a brush cutting machine as defined in claim 3 may be such that the plurality of attaching means are U-shaped hangers. (b) The flail cutter for a brush cutting machine as defined may be such that the plurality of holding means are C-shaped rings. (c) The flail cutter for a brush cutting machine as defined in claim 4 may be such that the plurality of first receiving means are holes positioned through the generally cylindrical member. (d) The flail cutter for a brush cutting machine as defined may be such that wherein the plurality of second receiving means are holes positioned through the locking means. (e) The flail cutter for a brush cutting machine as defined may be such that the attaching means are removably attached to the first and second receiving means. (f) The flail cutter for a brush cutting machine as defined may be such that the locking means is a slidable sheath to slide over the generally cylindrical member to thereby lock the blades in place attached to the generally cylindrical member. (g) The flail cutter for a brush cutting machine as defined may be such that the generally cylindrical member is powered by means of a chain drive system. (h) The flail cutter for a brush cutting machine as defined may be such that the holes of the plurality of first receiving means are generally L-shaped; and whereby the L-shaped holes of the plurality of first receiving means receive the attaching means in removable engagement. (i) The flail cutter for a brush cutting machine as defined may be such that the holes of the plurality of second receiving means are generally L-shaped; and whereby the L-shaped holes of the plurality of second receiving means receive the attaching means in removable engagement. ( ) The flail cutter for a brush cutting machine as defined may be such that the attaching means are hangers, each hanger having a first and second ends, the hangers each removably attached to one of the first and second receiving means at the first end, the hangers each attached to one of the holding means at the second end thereby holding a blade at the second end. (k) The flail cutter for a brush cutting machine as defined may be such that the hangers are removably inserted into the first and second receiving means and wherein the holding means is in the form of a C ring. (1) The flail cutter for a brush cutting machine as defined may be such that the attaching means are hangers, the hangers each having a first and second ends, the hangers each removably inserted into one of the first and second receiving means at the first end, the hangers each attached to one of the holding means at the second end thereby holding a blade at the second end. (m) The flail cutter for a brush cutting machine as defined may be such that the chain drive system is portable and removable from the flail cutter. (n) The method of providing a flail cutter for a brush cutting machine as defined in claim 5 may be such that the plurality of first receiving means are holes positioned through the generally cylindrical member. (o) The method of providing a flail cutter for a brush cutting machine as defined may be such that the plurality of second receiving means are holes positioned through the locking means, (p) The method of providing a flail cutter for a brush cutting machine as defined may be such that the attaching means are removably attached to the first and second receiving means. (q) The method of providing a flail cutter for a brush cutting machine as defined may be such that the locking means is a slidable sheath to slide over the generally cylindrical member to thereby lock the blades in place attached to the generally cylindrical member, (r) The method of providing a flail cutter for a brush cutting machine as defined may be such that wherein the generally cylindrical member is powered by means of a chain drive system. (s) The method of providing a flail cutter for a brush cutting machine as defined may be such that wherein the holes of the plurality of first receiving means are generally L-shaped; and whereby the L-shaped holes of the plurality of first receiving means receive the attaching means in removable engagement. (t) The method of providing a flail cutter for a brush cutting machine as defined may be such that the holes of the plurality of second receiving means are generally L- shaped; and whereby the L-shaped holes of the plurality of second receiving means receive the attaching means in removable engagement, (u) The method of providing a flail cutter for a brush cutting machine as defined may be such that the attaching means are hangers, the hangers each having a first and second ends, the hangers each removably attached to one of the first and second receiving means at the first end, the hangers each attached to one of the holding means at the second end thereby holding a blade at the second end. (v) The method of providing a flail cutter for a brush cutting machine as defined may be such that wherein the hangers are removably inserted into the first and second receiving means and wherein the holding means is in the form of a C clip. (w) The method of providing a flail cutter for a brush cutting machine as defined may be such that the attaching means are hangers, the hangers each having a first and second ends, the hangers each removably inserted into one of the first and second receiving means at the first end, the hangers each attached to one of the holding means at the second end thereby holding a blade at the second end. (x) The method of providing a flail cutter for a brush cutting machine as defined may be such that the chain drive system is portable and removable from the flail cutter. In the field of brush cutting using a riding type machine such as a tractor, conventional machines use a blade assembly which generally includes a blade having two ends with a double sided cutting edge on one end. A crossbar is used also having two ends, each end having one position for attaching a blade to the crossbar. This blade is attached at the top surface of the crossbar at one end of the crossbar with the blade in use presenting a forward facing blade to the material to be cut. A similar blade is attached at the other end to the upper surface of the crossbar with a rearward facing blade presented to the material to be cut. As the crossbar rotates around a horizontal plane, the blade having the rearward facing cutting edge moves into the position of the forward facing cutting edge so that the two blades cut the material in a circular fashion. At the attachment position where the prior art . blade attaches to a crossbar there is no cutting edge. The prior art blade then is turned over when the cutting edge on one side is dulled and the second cutting edge is used. In the prior art, a bolt is positioned through a hole in the distal end of the blade and into a corresponding hole in the crossbar. A nut is attached to the bolt at the top of the crossbar thus attaching the blade to the crossbar. During brush cutting, as the blade is presented to the ground the head of the bolt protrudes from the bottom surface of the blade. In another embodiment of the prior art, there is an offset in the form of a curve in the blade which allows the blade to be presented closer to the ground than the generally flat blade to thereby provide a closer cut. There are a number of problems in the prior art blade assemblies used for brush cutting. With the double sided cutting edge on one end there are only two useable cutting surfaces on each blade. The prior art blade is not resharpenable so that once the two cutting edges have been dulled the blade must be permanently replaced. These cutting surfaces are dulled rather quickly requiring much maintenance and expense to replace the blade. Further, with the nut and bolt attachment of the blade to the crossbar in the prior art, the head of the bolt protrudes from the lower surface of the blade. The lower surface of the blade is presented to the ground during brush cutting and if the blade strikes a rock or the like, hitting the head of the bolt, the bolt will most often be chipped, compromising the integrity of the bolt. This suggests a possible dangerous situation if the blade were to become unattached from the crossbar, and requires frequent replacement of the bolt with corresponding maintenance and expense. U.S. Patent 1,622,611 to Sera discloses a lawn mower with blades that rotate in a horizontal plane to cut grass in a circular path. U.S. Patent 2,786,322 to McEvers discloses a power mower rotary blade with four cutting edges that is horizontally rotatable so that two different sets of blades can be used in rotary operation. The blades are attached to a cutter bar using countersunk screws. U.S. Patent 3,395,522 to Zweegers teaches a mowing machine which includes a rotatable cutting device having drums with multiple blades attached that roll along the ground to cut grass, hay or the like. U.S. Patent 3,507,104 to Kline et al discloses a knife mounting for a rotary mower whereby two knives on one cutter can be removed and substituted for two knifes on an adjacent rotor so more knives can be used in the field before the knives are resharpened. U.S. Patent 3,762,138 to Michael discloses a mower blade assembly with cutter elements removably attached to a blade bar with flush mounted attachment pins. U.S. Patent 4,611,459 to Cartner discloses a blade assembly having four cutting edges, whereby the blade is attached to the upper surface of the crossbar. This configuration requires a stop mechanism so that as the crossbar rotates, the blades do not cut through the drive shaft that connects the blade assembly to the boom of the cutting machine. U.S. Patent 4,922,698 to Taylor discloses a cutter bar for a rotary lawn mower which has a plurality of indexable blades, whereby the cutter bar may be replaced without removing the blades or up-ending the mower. In order to overcome or at least alleviate problems inherent in the prior art, there is provided in a third aspect of the present invention a unique blade assembly for use on a brush cutting machine. The blade of the present blade assembly comprises a two sided cutting edge on both ends of the blade. With each end of the blade having two cutting edges there are thereby formed four cutting edges on each blade. In operation, this four sided cutting edge blade is attached to the bottom surface of the crossbar on a first far end of the crossbar so that the cutting edge in use will be forward facing. In a like manner, a similar blade is attached to the bottom surface of the crossbar on a second far end of the crossbar so that its cutting edge in use will be rearward facing. As the crossbar rotates around 360 degrees in a horizontal plane, the rearward facing cutting edge of the blade at the second far end of the crossbar is rotated to be positioned as the forward facing cutting edge so that the two blades on the crossbar serve to alternate having a forward facing and rearward facing cutting edge. In this way, the brush is cut in a circular motion. The advantage of mounting the blades to the bottom surface of the crossbar is that this allows the blades to be free swinging around the entire 360 degree cutting circle. A stop mechanism is also thus not required to prevent the blade from cutting through the drive shaft that connects the blade assembly to the boom of the cutting machine. Each blade portion of the subject blade assembly comprises two counter-bored holes on a first and second ends so that the blade can be reversed, both from front to back and side to side, taking full advantage of the four cutting edges provided on the blade. The counter-bored holes in the blade portion of the blade assembly allows the head of the attaching bolt to be flush with the bottom surface of the blade, thereby increasing the shearing surface capacity of the attaching bolt. This is an advantage over the prior art since, if the bottom surface of the blade strikes a rock or the like the recessed head of the attaching bolt will not be chipped. The blade portion of the present invention is formed from thicker metal than that of the prior art so that in addition to the head of the bolt being recessed into the lower surface of the blade, the head of the bolt is surrounded by thicker metal thereby protecting it even further. The thicker metal of the subject blade also allows it to be resharpened. More specifically, as the cutting edge of the blade dulls, instead of resharpening the existing edge of the blade, because of the thicker metal of the subject invention, a new edge entirely is re-cut with a torch. A new edge can be re-cut at least once. Because of its generally flat, downward sloping bevel, it can easily be re-cut to have the same general bevel, contrary to the prior art which cannot be resharpened. In the preferred embodiment of this aspect of the present invention, the crossbar portion of the subject blade assembly comprises two counter-bored holes on its first and second ends for attaching the blade to the crossbar which correspond to the counter-bored holes in the first and second ends of the blade. As one blade is attached to each end of the crossbar, thereby attaching a first blade to the first end of the crossbar and a second blade to the second end of the crossbar, the two counter bored holes on the first end of the crossbar correspond to the four counter bored holes in the first blade for positioning one of the four cutting edges of the first blade forwardly. In a similar manner, the two counter bored holes on the second end of the crossbar correspond to the four counter bored holes in the second blade for positioning one of the four cutting edges of the second blade rearwardly. In use, when one of the four available cutting edges on each blade is chosen to be put in the using position, an abruptly graduated diameter attaching bolt is positioned through the counter-bored hole in the opposite end of the blade so that the head of the bolt is recessed from the lower surface of the blade that is presented to the ground. The portion of the bolt that exits from the upper surface of the blade is then positioned through the corresponding counter-bored hole in the crossbar such that the smallest diameter of the hole in the blade matches the largest diameter of the corresponding counter-bored hole in the crossbar. In this way, a bolt is used with a large diameter at its top closest to its head for a strong, secure attachment, while having a smaller diameter at its screw end for easy securement of the bolt at the upper surface of the crossbar with a more conventional sized nut. In a second embodiment of this aspect of the present invention there is provided an alternative crossbar having a curve in its horizontal plane to provide an offset for the cutting edge, so that the cutting edge is brought closer to the ground and to the material to be cut. This is an advantage over the prior art since the improved blade assembly of this aspect of the present invention can be used while still maintaining the closer cut provided by the offset. In this way, the operator does not have to bring along a conventional blade should the closer cutting offset be desired. The aspect of the invention described above is defined in the appended claims. Specific features of those claims are note and elaborated in the following statements (a) to (r) : (a) The blade assembly as defined in claim 6 may be such that there are two cutting edges positioned on the first end of the metal member including a forward facing cutting edge and a rearward facing cutting edge and two cutting edges positioned on the second end of the metal member, including a forward facing cutting edge and a rearward facing cutting edge. (b) The blade assembly as defined may be such that the metal member is formed of at least 7/8 inch metal. (c) The blade assembly as defined may be such that the bevel of each of the cutting edges is re-cuttable. (d) The blade assembly as defined may be such that the attaching means is flush with the lower surface of the metal member. (e) The blade assembly as defined may be such that the first end of the metal member is the cutting edge using end and wherein the attaching means comprises at least one counter-bored hole positioned on the second end of the metal member and a bolt having a head and a body, the bolt being positioned through the counter-bored hole in the metal member and positioned through the hole in the crossbar and secured at the top surface of the crossbar with a nut, the head of the bolt thereby being flush with the lower surface of the metal member. (f) The blade assembly as defined may be such that the attaching means further comprises a crossbar having two ends and having at least one counter-bored hole positioned therethrough; and the body of the bolt has a graduated diameter with a large diameter at an end proximate to its head and a small diameter at an end distal to its head; and whereby the bolts large diameter body proximate to its head is used to attach the metal member to the crossbar for a secure attachment. (g) The blade assembly as defined may be such that the bolts small diameter body distal to its head is used to secure the bolt with a nut at the top surface of the crossbar, (h) The blade assembly as defined may be such that the crossbar has four counter-bored holes positioned therethrough for positioning the metal member outward from the end of the crossbar to which it is attached, thereby positioning the metal member outward from the sides of the cutting machine. (i) The blade assembly as defined may be such that the crossbar is curved to thereby position the cutting edge using end of the metal member close to the brush to be cut. ( ) The method of cutting brush as defined in claim 7 may be such that there are two cutting edges positioned on the first end of the metal member including a forward facing cutting edge and a rearward facing cutting edge and two cutting edges positioned on the second end of the metal member including a forward facing cutting edge and a rearward facing cutting edge further comprising the step of: e) inverting the metal member from the upper surface of the metal member to the lower surface of the metal member after the forward facing cutting edge thus positioned as a result of step d is dulled, thereby positioning the rearwardly facing cutting edge on the second end of the metal member forwardly in cutting position, (k) The method of cutting brush as defined may be such that the metal member is formed of at least 7/8 inch metal. (1) The method of cutting brush as defined may be such that the bevel of each cutting edge is re-cuttable. (m) The method of cutting brush as defined may be such that the attaching means is flush with the lower surface of the metal member. (n) The method of cutting brush as defined may be such that the first end of the metal member is the cutting edge using end and further comprising the step of: e) providing the attaching means of step b with at least one counter-bored hole positioned on the second end of the metal member and a bolt having a head and a body, the bolt being positioned through the counter-bored hole in the metal member and positioned through the hole in the crossbar and secured at the top surface of the crossbar with a nut, the head of the bolt thereby being recessed from the lower surface of the metal member. (o) The method of cutting brush as defined may further comprise the step of: f) providing the attaching means of step e with a crossbar having two ends and having at least one counter- bored hole positioned therethrough and wherein the body of the bolt has a graduated diameter with a large diameter at an end proximate to its head and a small diameter at an end distal to its head; and whereby a bolt having a large diameter body is used to attach the metal member to the crossbar for a secure attachment. (p) The method of cutting brush as defined may be such that the crossbar has an top surface and a bottom surface and wherein the bolts small diameter body distal to its head is used to secure the bolt with a nut at the top surface of the crossbar. (q) The method of cutting brush as defined may be such that the crossbar has four counter-bored holes positioned therethrough for positioning the metal member outward from the end of the crossbar to which it is attached, thereby positioning the metal member outward from the sides of the cutting machine. (r) The method of cutting brush as defined may be such that the crossbar is curved to thereby position the cutting edge using end of the metal member close to the brush to be cut. In general, a flail type brush cutting machine is a tractor having a flail cutter attachment attached to the front of the tractor. The flail cutter attachment is generally a shaft member having a plurality of receiving holes on its outside perimeter for receiving a plurality of hangers, a pair of hangers each holding a pair of blades. As the shaft is carried over the ground, the blades slash into the brush to be cut. Typically, in the prior art, the blades used on the flail cutter are an obtuse angled member having a stem; with an attaching hole which attaches to a hanger, and a floor; angled at greater than ninety degrees from the stem, the floor having a cutting edge for cutting brush as the blades are thrust into the brush as the shaft rotates near the ground. Generally, the prior art blades are formed from a relatively thin, flexible metal cut into strips and bent to form the obtuse angle. These thin metal strips have poor integrity due to the forced bend in this relatively thin metal, resulting in excessive breakage of the blades with resultant down time required to change the blades. The prior art blades are not bent to have a full right angle between the stem and the floor of the blade because to do so would reduce the integrity of the blade even more. U.S. Patent 2,691,262 to Swertfeger discloses a brush clearing machine with flails that are cast. The flail blades are chisel shaped and have an angle other than 90 degrees. U.S. Patent 2,812,701 to Weaver, Jr. discloses a rotary hoe with teeth that are forged from angled stock. U.S. Patent 2,938,326 to Lundell discloses a hay chopper having radially positioned members for chopping and gathering hay. U.S. Patent 3,177,640 to Mott, Jr. discloses a mower blade construction with reversible and resharpenable blades. Elliptical mounting holes are used to attach the blades to a link which attaches to a roller. The blades are bent to form and thus would be vulnerable to breakage. U.S. Patent 4,259,834 to Lambert et.al. discloses a synchronized flail that uses strengthened flail blades. U.S. Patent 4,434,642 to Rasmussen discloses a welded replacement grouser bar for an agricultural implement. U.S. Patent 5,293,734 to Mills discloses a bottom blade for a grass cutting unit which is formed by bending a steel mounting plate to form a lip. In order to overcome or at least alleviate problems inherent in the prior art there is provided in a fourth aspect of the present invention an improved blade for a flail type brush cutting machine. In this aspect of the present invention, the blade, its attaching hole in the stem for attaching the blade to a hanger, and the cutting edge of the blade are all torch cut from a thicker sheet of metal into any configuration desired. It is also within the spirit and scope of the invention to cast the blade into any desired configuration. In the preferred embodiment of this aspect of the present invention, the stem of the blade and the floor of the blade are torch cut as a one piece member having a ninety degree angle between them. In this way, a stronger blade is formed having the optimum angle for cutting the brush closely. Thus, without a forced bend in the metal of the blade, there is increased integrity in the blade with less breakage and consequent down time. The blade of the present invention also cuts heavier brush because of its thicker metal and is resharpenable and renewable also because of the thicker metal and the cutting edge formed by the torch cut process. The cutting edge of the present blade can be re-cut with a torch after the cutting edge has dulled, thus reducing replacement costs for dulled blades as well as replacement costs from breakage of the blade. By re-cutting the cutting edge of the blade, any nicks or other flaws that may effect the cutting efficiency of the blade are eliminated. In operation, two blades are attached back to back onto the rotating flail cutter. It is therefore also, within the spirit and scope of the invention to torch cut or cast two or more blades together in a one piece integral unit. The aspect of the invention described above is defined in the appended claims. Specific features of those claims are noted and elaborated in the following statements (a) to (r) : (a) A blade for a flail type brush cutting machine as defined in claim 8 may be such that the attaching means is a hole in the stem of the blade for attaching the blade to a flail cutter. (b) A blade for a flail type brush cutting machine as defined may be such that the angle between the stem and floor of the blade is less than one hundred eight degrees. (c) A blade for a flail type brush cutting machine as defined may be such that the cutting edge on the floor of the blade is torch cut or cast. (d) A blade for a flail type brush cutting machine as defined may be such that the attaching hole in the stem of the blade is generally elliptical; and, whereby the blade can easily slide on a hanger to thereby flail more past the brush. (e) A blade for a flail type brush cutting machine as defined may be such that the attaching hole in the stem is generally circular. (f) A blade for a flail type brush cutting machine as defined may be such that the generally elliptical hole in the stem is torch cut or cast. (g) A blade for a flail type brush cutting machine as defined may be such that the generally circular hole in the stem is torch cut or cast. (h) A blade for a flail type brush cutting machine as defined may be such that the stem and floor are torch cut or cast to form a blade that is at least 5/16 inch thick, (i) A blade for a flail type brush cutting machine as defined may be such that the cutting edge is resharpenable and renewable by repeat torch cutting. (j ) The method for producing a blade for a flail type cutting machine as defined in claim 9 may be such that the attaching means is a hole in the stem of the blade for attaching the blade to a flail cutter. (k) The method for producing a blade for a flail type utting machine as defined may be such that the angle between the stem and floor of the blade is less than one hundred eight degrees. (1) The method for producing a blade for a flail type brush cutting machine as defined may further comprise the step of: d) torch cutting or casting the cutting edge on the floor of the blade. (m) The method for producing a blade for a flail type brush cutter as defined may be such that the attaching hole in the stem of the blade is generally elliptical; and, whereby the blade can easily slide on a hanger to thereby flail freely. (n) The method for producing a blade for a flail type brush cutting machine as defined may be such that the attaching hole in the stem is generally circular. (o) The method for producing a blade for a flail type brush cutting machine as defined may further comprise the step of: torch cutting or casting the generally elliptical hole in the stem. (p) The method for producing a blade for a flail type brush cutting machine as defined may further comprise the step of: torch cutting or casting the generally circular hole in the stem. (q) The method for producing a blade for a flail type brush cutting machine as defined may be such that the stem and floor are torch cut or cast to form a blade that is at least 5/16 inch thick. (r) The method for producing a blade for a flail type brush cutting machine as defined may be such that the cutting edge is resharpenable and renewable by repeat torch cutting. Industrial Applicability It is therefore an aim of the present invention to go at least some way towards providing a rotating, floating control assembly for a brush cutting machine that allows the blade to follow the lay of the ground where brush is to be cut providing a closer cut of the brush. It is another aim of the present invention to go at least some way towards providing a rotating, floating control assembly for a brush cutting machine that allows an improved cut of brush with less stress imposed on the machine and the operator. It is yet another aim of the present invention to go at least some way towards providing a rotating, floating control assembly for a brush cutting machine that allows a forward facing blade to be positioned into the material to be cut without movement of the brush cutting machine. It is still yet another aim of the present invention to go at least some way towards providing a combination angling and attaching means for the control assembly which allows for the vertical and angular movement of the control assembly and hence the vertical and angular movement of the blade assembly. It is still yet another aim of the present invention to go at least some way towards providing a center mount on the blade assembly for the rotating, floating control assembly for a brush cutting machine so that as the control assembly moves over rocks and debris, the movement of the blade assembly is controlled in an efficient manner. It is still yet another aim of the present invention to go at least some way towards providing a quick attachment means for attaching the rotating, floating control assembly to the blade assembly and to the boom of a cutting machine thereby reducing time and expense in a brush cutting operation and increasing convenience for the operator. It is an aim of the present invention to go at least some way towards providing a flail cutter with a quick and easy blade replacement for low maintenance time and expense. It is another aim of the present invention to go at least some way towards providing a flail cutter powered by a chain drive system to improve the dependability of the cutter by eliminating belts that can slip and/or break. It is another aim of the present invention to go at least some way towards providing a flail cutter with Securely attached blades and attaching means so that the blades do not fly off the flail cutter upon hitting a hard object. It is still yet another aim of the present invention to go at least some way towards providing a flail cutter with a portable hydraulic motor for easy maintenance on the motor, sprockets and chain. It is still yet another aim of the present invention to go at least some way towards providing a flail cutter with a portable motor to be used as an emergency replacement part for another flail cutter. It is an aim of the present invention to go at least some way towards providing a blade assembly for a brush cutting machine that is safer, easier and less expensive in its operation and maintenance. It is another aim of the present invention to go at least some way towards providing a blade assembly having free swinging blades around an entire 360 degree cutting radius. It is yet another aim of the present invention to go at least some way towards providing a blade assembly having blades which do not interfere with the drive shaft connecting the blade assembly to the boom of the cutting machine. It is still yet another aim of the present invention to go at least some way towards providing a blade assembly that has more cutting edges and is thereby less expensive in its use and maintenance and more convenient for the operator. It is still yet another aim of the present invention to go at least some way towards providing a blade assembly that has an attaching means for attaching the blade to the crossbar that is recessed from the surface of the blade that is presented to the ground thereby making the blade assembly safer to use and less vulnerable to breakage and consequent expense. It is still yet another aim of the present invention to go at least some way towards providing a blade assembly that has an attaching means that provides for use of a graduated diameter bolt so a large diameter bolt is used for a secure attachment while still allowing a smaller diameter screw end to be secured with a nut, thereby providing a secure and convenient attachment. It is still yet another aim of the present invention to go at least some way towards providing a blade assembly that is re-cuttable and therefore much longer lasting with less expense and more convenience. It is still yet another aim of the present invention to go at least some way towards providing a blade assembly with an alternate embodiment having an offset in the crossbar so that a closer cut of brush is accomplished without a change in blade. It is an aim of the present invention to go at least some way towards providing a blade for a flail type brush cutting machine which cuts brush closely. It is another aim of the present invention to go at least some way towards providing a blade for a flail type brush cutting machine with high integrity and low breakage characteristics. It is yet another aim of the present invention to go at least some way towards providing a blade for a flail type brush cutting machine with a resharpenable and renewable cutting edge to thereby reduce replacement costs, and improve the efficiency of the blade. It is still yet another aim of the present invention to go at least some way towards providing a blade for a flail type brush cutting machine which cuts heavy brush due to its heavier metal composition. Detailed Description of Embodiments of the Invention For ease of understanding of the invention, and to illustrate how the same may be put into effect, embodiments will now be described, purely by way of example and without limitation, with reference to the accompanying drawings. Brief Description of the Drawings Figure 1 is a front perspective view showing the control assembly of the first aspect of the present invention positioned on a brush cutting machine and used to control the movements of a conventional blade assembly. Figure 2 is a front perspective view showing the control assembly of the present invention positioned on a brush cutting machine and used with the improved blade assembly of the third aspect of the present invention. Figure 3 is an enlarged perspective view showing the attachment of the upper and lower rotation plates of the present control assembly in greater detail. Figure 4 is a top perspective view showing the control assembly of the present invention in greater detail. The control assembly being used with the improved blade assembly of Figure 2. Figure 5, the control assembly being used with the improved blade assembly of Figures 2 and 4 is a bottom perspective view showing the control assembly of the present invention in greater detail, and showing the quick attachment feature of the present control assembly. Figure 6 is an exploded perspective view showing the combination angling and attaching means of the present control assembly in greater detail. Figure 7 is a perspective view of the present control assembly showing the center mounting member which mounts the control assembly over the center of the blade assembly as showing how the center mounting member lifts the blade assembly over rocks and debris. Figure 8 is a front perspective view showing how the flail cutter of a first preferred embodiment of the second aspect of the present invention is attached to an existing brush cutting machine. Figure 9 is a front perspective view of the first preferred embodiment of the flail cutter of the present invention having a cut out portion showing how the blades are attached to the flail cutter in the present invention. Figure 10 is an exploded isometric view of the first preferred embodiment of the flail cutter of the present invention showing also how the blades are attached to the flail cutter of the present invention. Figure 11 is an enlarged exploded isometric view of the first preferred embodiment of the flail cutter of the present invention showing how the blades are easily attached to the shaft of the flail cutter and showing the blades before they are locked into place by the locking sheath of the present invention. Figure 12 is an enlarged exploded isometric view of the first preferred embodiment of the flail cutter of the present invention showing how the blades have been easily attached to the shaft of the flail cutter and showing the blades after they have been locked into place by the locking sheath of the present invention. Figure 13 is a cross-sectional view taken through line 6-6 of Figure 11 showing how the blades are attached to the shaft of the flail cutter of the first preferred embodiment of the present invention before the blades have been locked into place by the locking sheath of the present invention. Figure 14 is a cross-sectional view taken through line 7-7 of Figure 12 showing how the blades have been attached to the shaft of the flail cutter of the first preferred embodiment of the present invention after the blades have been locked into place by the locking sheath of the present invention. Figure 15 is an enlarged isometric view similar to Figure 12 of the flail cutter of the second preferred embodiment of the second aspect of the present invention showing how the blades have been easily attached to the shaft of the flail cutter with the hangers bolted or otherwise suitably attached to the shaft of the flail cutter. Figure 16 is an enlarged exploded isometric view showing in greater detail the chain drive system that powers and rotates the shaft of the flail cutter of the present invention. Figure 17 is a front plan view showing how the blade assembly of the third aspect of the present invention is positioned on an existing cutting machine. Figure 17A is an enlarged top perspective view of the blade assembly of the present invention. Figure 18 is an exploded bottom perspective view showing how the blade assembly of the present invention is attached together in operation. Figure 19 is a side plan view of the blade assembly after the blade is attached to the crossbar. Figure 20A is a bottom perspective view of the blade assembly after the blade is attached to the crossbar when the first cutting edge is used. Figure 20B is an exploded bottom perspective view of the blade assembly when the first cutting edge is used. Figure 21A is a bottom perspective view of the blade assembly after the blade is attached to the crossbar when the second cutting edge is used. Figure 21B is an exploded bottom perspective view of the blade assembly when the second cutting edge is used. Figure 22A is a bottom perspective view of the blade assembly after the blade is attached to the crossbar when the third cutting edge is used. Figure 22B is an exploded bottom perspective view of the blade assembly when the third cutting edge is used. Figure 23A is a bottom perspective view of the blade assembly after the blade is attached to the crossbar when the fourth cutting edge is used. Figure 23B is an exploded bottom perspective view of the blade assembly when the fourth cutting edge is used. Figure 24 is a top perspective view of the blade assembly of the present invention. Figure 25 is a top perspective view of a second embodiment of the third aspect of the present invention, showing an alternative crossbar. Figure 26 is a front perspective view showing how the blade of the fourth aspect of the present invention is positioned on the flail cutter of an existing cutting machine. Figure 27 is a side perspective view of the prior art showing how prior art blades are typically formed to have an obtuse angle formed between the stem of the blade and the floor of the blade. Figure 28 is a side perspective view of a preferred embodiment of the fourth aspect of the present invention showing the right angle formed between the stem of the blade and the floor of the blade and showing an elliptical attaching hole in the stem of the blade. Figure 29 is a side elevation view of the present invention also showing the right angle formed between the stem of the blade and the floor of the blade. Figure 30 is a side plan view showing how the preferred embodiment of the fourth aspect of the present invention is torch cut from a thicker metal into any desired configuration. Figure 31 is a side perspective view showing how the flail blades of the present invention are attached to an existing flail cutter. Figure 32 is a side perspective view of another preferred embodiment of the fourth aspect of the present invention showing the right angle formed between the stem of the blade and the floor of the blade and showing a round attaching hole in the stem of the blade. Detailed Description of the Drawings Referring now to Figures 1 to 7 of the drawings, and firstly to Figure 1 of the drawings, there is shown a front perspective view of the present rotating, floating and quick attaching control assembly for a brush cutting machine shown as it is positioned on a brush cutting machine and used to control the movements of a conventional blade assembly. In Figure 1 the brush cutting machine is shown generally by the number 10a and the rotating, floating control assembly is shown generally by the number 12a. In Figure 1 it can be seen that extending from the side 14a of the brush cutting machine 10a is a boom 16a having two arms 18a and 20a. The first arm 18a of the boom 16a is located closest to the cutting machine 10a and is attached to the side 14a of the cutting machine 10a. The second arm 20a of the boom 16a is attached to the first arm 18a and is referred to as the dipper boom. Positioned between the distal end 21a of the dipper boom 20a and the blade assembly 22a of the cutting machine 10a is the control assembly 12a of the present invention. At the top 23a of the control assembly 12a there is an upper rotation plate 24a having an upper surface 26a and a lower surface 28a as seen most clearly in Figure 3. A tower 30a is welded to the upper surface 26a of the upper rotation plate 24a. Extending upward from the tower 30a is a center shaft member 32a which holds the upper rotation plate 24a and the lower rotation plate 34a together. Two plates 38a and 40a comprise the two sides 42a and 44a of the bushing 40a as seen most clearly in Figure 6. Positioned over the center shaft member 32a is the cylindrical part 36a of the bushing 46a, the two sides 42a and 44a of the bushing 46a are attached together at the rear 48a of the bushing 46a. Attached below the bushing 46a is the hydraulic cylinder housing 49a which holds the hydraulic cylinder 50a that causes the control assembly 12a to rotate. The two sides 42a and 44a of the bushing 46a positioned at the top of the control assembly 12a are attached to the distal end 21a of the dipper boom 20a with two securing pins 52a and 54a. Two other pins 56a and 58a serve as pins through a hinge 59a as seen most clearly in Figure 6. The hinge 59a provides bending action for the control assembly 12a relative to the dipper boom 20a. The top 23a of the control assembly 12a generally comprises the upper rotation plate 24a and everything above it up to the dipper boom 20a. Above the top 23a of the control assembly 12a is a conventional hydraulic cylinder 60a that is mounted on the dipper boom 20a and causes the dipper boom 20a to dip. At the bottom 61a of the control assembly 12a is the lower rotation plate 34a which is attached to the top 62a of the blade assembly 22a by an attachment means 64a as will be described in greater detail hereinafter, the bottom 61a of the control assembly 12a thereby generally comprising the lower rotation plate 34a and everything below it to the top 62a of the blade assembly 22a. In the preferred embodiment of the present invention, the control assembly 12a includes a center mounting member 66a for attaching the control assembly 12a to the center 68a of the top 62a of the blade assembly 22a as seen in Figure 4. In Figure 1, the bottom 61a of the control assembly 12a is shown attached by the center mounting member 66a to the center 68a of the top 62a of a conventional blade assembly 22a. The control assembly 12a of the present invention can be used with numerous conventional blade assemblies, such as a flail cutter and others. For purposes of illustration the control assembly 12a will be described used with a conventional rotary blade assembly. A conventional blade assembly 22a generally includes a blade or cutting portion 70a generally having two identical blades 72a, a crossbar 74a, and a sheath 76a positioned over the blade or cutting portion 70a of the blade assembly 22a, the sheath 76a having a forward facing opening 78a with the blades 72a rotating out of the opening 78a to cut brush 80a in front of the opening 78a, the sheath 76a thereby forming the top 62a and sides 82a of the blade assembly 22a. The center mounting member 66a in the form of a generally U shaped bracket is secured to the center 68a of the top 62a of the sheath 76a forming the top 62a of the blade assembly 22a. It is seen in Figure 1 that the control assembly 12a of the present invention is used with a conventional blade assembly 22a, the only adaptation being required to use the control assembly 12a with a conventional blade assembly 22a is that the center mounting member 66a be attached to the center 68a of the top 62a of the sheath 76a. This generally inverted U shaped bracket 66a is positioned under the attachment means 64a which attaches the control assembly 12a to the blade assembly 22a and is positioned on the top 62a of the blade assembly 22a as seen most clearly in Figure 5. As seen in Figures 5 and 7a, the upper portion 84a of the inverted U shaped bracket or center mounting member 66a is sloped downwardly toward the leading edge end 86a of the blade assembly 22a as seen most clearly in Figure 7. This downward sloping of the upper portion 84a of the center mounting member 66a causes a constant counter lifting condition on the leading edge end 86a of the blade assembly 22a. This lifting ensures that as the leading edge end 86a of the blade assembly 22a encounters rocks 88a, debris or the like that it will lift gently over the top of these obstacles while still presenting the cutting blades 72a of the blade or cutting portion 70a of the blade assembly 22a forwardly to the brush 80a around them as shown most clearly in Figures 1 and 7. Further, the specific control functions afforded by the present control assembly 12a, i.e. rotating, and vertical swivelling or angular adjustment of the blade assembly 22a, are accomplished more efficiently with the use of the center mounting member 66a as movements and adjustments start at the center 68a of the blade assembly 22a and move outwardly allowing finer movements to accomplish the various control adjustments. Figure 3 is an enlarged perspective view showing the attachment of the upper and lower rotation plates of the control assembly of the present invention in greater detail. As seen in Figure 3, the rotating, floating control assembly 12a comprises generally an upper rotation plate 24a which is part of the top 23a of the control assembly 12a, the upper rotation plate 24a having an upper surface 26a and a lower surface 28a. A lower rotation plate 34a which is part of the bottom 61a of the control assembly 12a also has an upper surface 90a and a lower surface 92a. This upper rotation plate 24a and lower rotation plate 34a generally comprise the rotating means 94a of the present control assembly 12a. The upper rotation plate 24a of the rotating means 94a is attached to the lower rotation plate 34a of the rotating means 94a by means of four winged tabs 96a, 98a, 100a, and 102a that extend from the upper surface 26a of the upper rotation plate 24a and form a right angle to extend past the lower rotation plate 34a. Each winged tab 96a, 98a, 100a and 102a has a slot 104a for positioning a bolt 106a therethrough. Each bolt 106a is positioned through each slot 104a in each winged tab 96a, 98a, 100a and 102a at the outer surface 108a of the winged tabs 96a, 98a, 100a and 102a. At the inner surface 110a of each winged tab 96a, 98a, 100a and 102a each of the bolts 106a is secured with a combination mating nut and stop, each combination mating nut and stop 112a in turn is attached at its lower surface 114a for the entire length 116a of the combination mating nut and stop 112a to the upper surface 90a of the lower rotation plate r _o of the control assembly 12a. The winged tab 96a with the bolt 106a is an example of how all the winged tabs 96a, 98a, 100a and 102a with all four bolts 106a are attached. As the bolt 106a is positioned through the outer surface 108a of the winged tab 96a and into engagement with the corresponding combination mating nut and stop 112a serves to stop the screw end 118a of the bolt 106a so that the bottom surface 120a of the bolt head 122a remains flush with the outer surface 108a of the winged tab 96a. Figure 4 is a top perspective view showing the control assembly of the present invention in greater detail. In the preferred embodiment of this aspect of the present invention, there are a plurality of coil springs 124a positioned between the upper rotation plate 24a and the lower rotation plate 34a of the control assembly 12. The upper 24 and lower 34 rotation plates comprise the rotating means 94a and the plurality - f coil springs 124a generally comprise the adjusting means 126a of the control assembly 12a as seen most clearly in Figure 6. Each coil spring 124a is secured to the upper surface 90a of the lower rotation plate 34a by a spring retainer 125a, the spring retainers 125a each being positioned around a securing hole 127a used as part of the attachment means 64a as will be described hereinafter with reference to Figure 5. In general, in the preferred embodiment of this aspect of the present invention, and as seen most clearly in Figure 6, the two rotation plates 24a and 34a are caused to rotate together in the same direction by the hydraulic cylinder 50a or control means 128a. The cylinder 50a of the control means 128a is encased in a metal housing 49a, the bottom 130a of the metal housing 49a is welded to the upper surface 26a of the upper rotation plate 24a. The top 132a of the metal housing 49a is fixedly attached to the lower surfaces 134a of the plates 38a and 40a that form the sides 42a and 44a of the bushing 46a that is in turn attached to the distal end 21a of the dipper boom 20a. This cylinder 50a has a first chain 136a attached to the first end 138a of the horizontal hydraulic cylinder 50a, and a second chain 140a attached to the second end 142a of the horizontal hydraulic cylinder 50a. The chains 136a and 140a are attached to the tubular tower 30a which extends upwardly from the upper rotation plate 24a of the control assembly 12a. The first chain 136a is wrapped in a clockwise direction around the tower 30a, and the second chain 140a is wrapped in a counter-clockwise direction around the tower 30a. When the horizontal hydraulic cylinder 50a is extended in either the clockwise or counter-clockwise direction, the upper 24a and lower 34a rotation plates are rotated in the same direction. The rotation of the upper rotation plate 24a and the lower rotation plate 34a that comprise the rotating means 94a cause the blade assembly 22a to rotate in the same direction. In the preferred embodiment then, the two rotation plates 24a and 34a are caused to rotate together in the same direction by the hydraulic cylinder 50a or control means 128a positioned on the control assembly 12a just behind the tower 30a and attached to the upper surface 26a of the upper rotation plate 24a of the rotating means 94a, but it is to be understood that other suitable methods of causing rotation of the rotating means 94a of the present invention are within the spirit and scope of the invention. As seen in Figure 1 and in more detail in Figures 4 and 6, the upper surface 26a of the upper rotation plate 24a is attached to the tower 30a, the tower 30a is attached to the center shaft member 32a which extends from the lower rotation plate 34a up through the upper rotation plate 24a, and through the tower 30a. The center shaft member 32a attaches to both sides 42a and 44a of the bushing 46a which in turn attach to the distal end 21a of the dipper boom 20a. The lower surface 92a of the lower rotation plate 34a is releasibly attached to the top 62a of a blade assembly 22a. As described hereinbefore, the control assembly 12a of the present invention is shown used with a conventional blade assembly 22a in Figure 1. In operation of the preferred embodiment, the rotating, floating control assembly 12a rotates at plus or minus 180 degrees allowing the control assembly 12a to be rotated in the opposing direction of the boom 16a thereby maintaining a forward facing cutting position 144a so that the blade assembly 22a and hence the blades 72a are facing into the brush 80a to be cut. It is nwever, within the spirit and scope of the present -vention to rotate the control assembly 12a around an entire 360 degree or less radius. Conventional blade assemblies 22a are covered by a sheath 76a having an opening 78a. As the blades 72a rotate, the brush 80a in front of the opening 78a is cut. If the boom 16a is turned, the opening 78a in the sheath 76a moves, thus the opening 78a would move away from the brush 80a to be cut thereby cutting a narrower area. If the boom 16a was rotated 90 degrees forwardly, the opening 78a in the sheath 76a would move such that the side 82a of the sheath 76a would replace the opening 78a and the opening 78a would move completely away from the brush 80a and there would be no brush 80a cut. Therefore, prior art blade assemblies positioned at the distal end 21a of the dipper boom 20a allow the blade assembly 22a to only be positioned at the side 14a of the cutting machine 10a. It can be seen therefore that in order to position the blade assembly 22a so that it is forward facing into the material to be cut, the prior art requires the physical movement of the cutting machine 10a to move the blade assembly 22a. Figure 2 is a front perspective view showing the control assembly of the present invention positioned on a brush cutting machine 10a and used with the improved blade assembly 146a of the third aspect of the present invention (described below in more detail with reference to Figures 17 to 22) . As seen in Figure 2 and in Figure 5, the control assembly 12a of the present invention can also be used with this improved blade assembly 146a generally including two identical improved blades 148a, a crossbar 150a and attachment means 152a for attaching the blades 148a to the crossbar 150a with no changes to its operation as described hereinbefore or after. In the present application then, descriptions relating to the use of the conventional blade assembly 22a are interchangeable with descriptions relating to the use of the improved blade assembly 146a and vice versa. Figure 5 is a bottom perspective view showing the control assembly of the present invention in greater detail. As described previously, the rotating, floating control assembly 12a of the present invention generally includes an upper rotation plate 24a and a lower rotation plate 34a comprising the rotating means 94a and a plurality of coil springs 124a therebetween. The coil springs 124a comprise the adjusting means 126a of the control assembly 12a and adjust the vertical movement of the blade assembly 22a relative to the ground 154a and brush 80a as seen most clearly in Figure 7. The coil springs 124a thereby act as shock absorbers and change short abrupt jolts received by the blade assembly 22a as it strikes uneven ground into softer, smoother movements as received by the brush cutting machine 10a, thus reducing stress on the brush cutting machine 10a and the operator. This plurality of coil springs 124a that comprise the adjusting means 126a, positioned between the upper rotation plate 24a and the lower rotation plate 34a that comprise the rotating means 94a serve to allow adjustment of the position of the blade assembly 22a and hence the blades 72a relative to the ground 154a in a longitudinal plane that extends around the entire circumference of the upper 24a and lower 34a rotation plates. It can be seen therefore, that the control assembly 12a of the present invention allows very fine adjustment of the blade 72a position relative to the ground 154a such that adaptations are made to the position of the blade assembly 22a and hence to the blades 72a through- use of the present control assembly 12a for very minor changes in the ground 154a being covered. With the plurality of coil springs 124a used in the present invention these adjustments are made in quick response to the up and down movement of the blade assembly 22a across the ground 154a. Referring now to Figure 6 of the drawings there is shown an exploded perspective view showing the combination angling and attaching means of the present control assembly in greater detail. The combination angling and attaching means 156a allows the swivelling and angular movement of the control assembly 12a to thereby control the swivelling and angular movement of the blade assembly 22a. As an attaching means 158a, the combination angling and attaching means 156a serves as the center shaft member 32a which holds the rotating means 94a and adjusting means 126a together. The angling means 160a positioned at the first angling end 162a of the combination angling and attaching means 156a comprises a first right plate 164a and a second left plate 166a which are generally semicircular plates with mating holes 168a and 170a positioned therethrough for receiving a bolt 172a. The bolt 172a is positioned through the mating hole 168a in the first right plate 164a of the combination angling and attaching means 156a, through a swivelling means 174a, and through the mating hole 170a in the second left plate 166a to thereby attach the swivelling means 174a between the first right 164a and the second left 166a semicircular plates of the angling end 162a of the combination angling and attaching means 156a. The angling means 160a of the combination angling and attaching means 156a also comprises the swivelling means 174a which is a generally ball shaped member 176a, a washer 178a to the left of the second left plate 162a, and a mating hollow threaded pin 180a to the left of the washer 178a. The threaded bolt 172a goes through the washer 178a, and into the hollow threaded pin 180a, the washer 178a serving to secure the threaded pin 180a in the holes 168a and 170a of the semicircular plates 164a and 166a. The hollow threaded pin 180a has a threaded diameter hole that receives the screw end 182a of the bolt 172a to allow the ball shaped member 176a to swivel on the axis formed by the body 184a of the bolt 172a through the center 186a of the swivelling means 174a. The swivelling means 174a is attached at its lower surface 187a to the upper surface 90a of the lower rotation plate 34a of the control assembly 12a. In operation, the ball shaped member 176a swivels in between the two left and right plates 164a and 166a in a similar fashion to a universal joint to provide angular adjustment of the control assembly 12a and consequently of the blade assembly 22a. The attaching means 158a of the combination angling and attaching means 156a generally comprises the center shaft member 32a and a bolted nut 188a. The attaching means 158a is positioned on the second shaft and attaching end 190a of the combination angling and attaching means 156a. The center shaft member 32a extends upward from the swivelling means 174a, through the lower 28a and upper 26a surfaces of the upper rotation plate 24a of the control assembly 12a, through a first thrust bearing 192a, the bushing 46a attached to the dipper boom 20a, and through a second thrust bearing 194a. The top 196a of the center shaft member 32a is secured with the bolted nut 188a. Positioned through the top 196a of the center shaft member 32a is a hole 198a with a bolt 200a therethrough secured with a corresponding nut 202a which acts as a stop for the bolted nut 188a so that the bolted nut 188a does not back off the top 196a of the center shaft member 32a in operation. Figure 5 of the drawings is a bottom perspective view showing the control assembly of the present invention in greater detail and showing the quick attachment means of the present control assembly. In Figure 5 it can be seen that the lower surface 92a of the lower rotation plate 34a of the control assembly 12a is positioned over a securing means 204a in the form of a plate 206a, the lower surface 207a of the plate 206a being integral with the upper portion 84a of the center mounting member 66a which is fixedly attached to the top 62a of the center 68a of the blade assembly 22a. Since the securing means plate 206a is fixedly attached to the upper portion 84a of the center mounting member 66a, the securing means plate 206a will slope downwardly during operation as the center mounting member 66a lifts the leading edge end 86a of the blade assembly 22a over rocks 88a and debris as described with reference to Figure 7. A centering pin 208a on the lower surface 92a of the lower rotation plate 34a of the control assembly 12a is inserted into a centering hole 210a in the securing means plate 206a as seen most clearly in Figure 4. The two straight sides 212a and 214a of the securing means plate 206a line up with the two straight lines 216a and 218a shown in phantom on the lower rotation plate 34a of the control assembly 12a. When the lower surface 92a of the lower rotation plate 34a of the rotating control assembly 12a and the securing means plate 206a are joined together, the rotating control assembly 12a is rotated 90 degrees in either direction thereby locking the curved members 220a and 222a of the attachment means 64a on the lower rotation plate 34a of the rotating control assembly 12a and the curved edges 224a and 226a of the securing means plate 206a together. Two securing pins 228a and 230a at the upper surface 90a of the lower rotation plate 34a of the control assembly 12a are then inserted into any two securing holes 127a, which are through both the lower rotation plate 34a and the securing means plate 206a to secure the securing means plate 206a to the bottom 61a of the control assembly 12a. In the preferred embodiment of this aspect of the present invention, the 90 degree rotation of the rotating control assembly 12a for attachment purposes is accomplished by the same hydraulic cylinder 50a that rotates the present control assembly 12a plus or minus 180 degrees to position the blade assembly 22a in a forward facing position relative to the brush 80a to be cut, but it is within the spirit and scope of the present invention to accomplish this 90 or 180 or more degree rotation by any similar means. It can be seen from the foregoing that a control assembly has been provided which rotates the blade assembly of the machine so that it is forward facing into the material to be cut for an improved cut with less time and more efficient use of the cutting machine. An adjusting means has been provided for adjusting the vertical movement of the blade assembly relative to the ground for an improved cut and less stress on the cutting machine and the operator. A center mounting member has been provided for mounting the control assembly to the center of the top of the blade assembly for efficient control of the movement of the blade assembly and for moving the blade assembly lightly over rocks and debris with less stress on the cutting machine and the operator. A combination angling and attaching means is provided to attach the rotating means and the adjusting means together and to swivel and angle the control assembly and hence the blade assembly relative to the ground. A quick attachment means has been provided for attaching a variety of blade assemblies to the dipper boom in a quick and efficient manner. Referring now to Figures 8 to 16 of the drawings, and firstly to Figure 8 of the drawings, there is shown a front perspective view of how the flail cutter of the first preferred embodiment of the second aspect of the present invention is attached to a conventional brush cutting machine. The flail cutter of the present invention is shown generally by the number 10b. The flail cutter 10b is attached to the boom 12b of a tractor 14b by the attaching plate 15b positioned on the flail cutter 10b as seen in Figure 9. As seen most clearly in Figures 10 and 11, the flail cutter 10b generally comprises a generally cylindrical member 16b, the generally cylindrical member 16b having a plurality of first receiving means 18b positioned thereon. A locking means 20b having a plurality of second receiving means 22b positioned thereon is positioned over the generally cylindrical member 16b whereby the plurality of first receiving means 18b line up with the plurality of second receiving means 22b as seen most clearly in Figure 11. Each of the first receiving means 18b and the second receiving means 22b has one of a plurality of attaching means 24b attached thereto. At least one of a plurality of blades 26b is attached to one of the attaching means 24b. The second plurality of receiving means 22b on the locking means 20b is positioned over the first plurality of receiving means 18b on the cylinder 16b to thereby lock the blades 26b in attached engagement to the generally cylindrical member 16b. In the preferred embodiment of this aspect of the present invention, the generally cylindrical member 16b is in the form of a shaft 28b. As seen most clearly in Figure 10, the plurality of first receiving means 18b are in the form of generally L-shaped holes 30b positioned through the shaft 28b. The plurality of second receiving means 22b on the locking means 20b are lined up with the plurality of first receiving means 18b and are also generally L-shaped holes 32b. The plurality of attaching means 24b are in the form of generally U-shaped hangers 34b. On each of the U-shaped hangers 34b, at the top 36b of both sides 38b of the U-shape there are protrusions 40b as seen most clearly in Figure 11. Directly under the two protrusions 40b are two notches 42b. Each of these two protrusions 40b is adapted to fit in locking engagement with the two sides 44b of the top 46b of the upside-down L-shaped hole 30b in the shaft 28b as seen in Figures 10 and 11. The shaft 28b slides into the notches 42b on the hangers 34b and the locking means 20b slides over the thicker part 48b on both sides 38b of the U- shaped hanger 34b. In this way, each of the plurality of hangers 34b is inserted through a mating L-shaped hole 32b through the outside perimeter 50b of the locking means 20b and through another mating L-shaped hole 30b in the shaft 28b also as seen in Figures 10 and 11. In operation, when it is desired to change any or all of the flail blades 26b in a quick and simple fashion, the hangers 34b are slid out of their locked engagement in the mating L-shapes holes 30b and 32b. As best seen in Figure 11, a holding means 52b in the form of a C-shaped ring 54b which is known in the art, is positioned through an attaching hole 56b in the stem 58b of the blade 26b whereby a pair of blades 60b are positioned back to back on the C-shaped ring 54b. The U-shaped hanger 34b is then positioned onto the combination of the C ring 54b and the pair of blades 60b, the C-shaped ring 54b serving to hold the blades 26b on the U-shaped hanger 34b. The U-shaped hanger 34b with the C ring 54b and the blades 26b attached, is then slid back into engagement with the protrusions 40b on the U-shaped hanger 34b fitting snugly into the two sides 44b of the top 46b of the upside down L-shaped hole 30b in the shaft 28b as described earlier. The purpose of the C-shaped ring 54b is to allow the pair of blades 60b to flail freely from the hanger 34b and to position the pair of blades 60b perpendicular to the hanger 34b so that the blades 26b are facing forwardly in the proper cutting position. When each of the hangers 34b has been inserted into each of the holes 30b in the shaft 28b and each of the holes 32b in the locking means 20b, with the locking means 20b positioned over the shaft 28b; the pairs of blades 60b on the C ring 54b inserted through the hangers 34b has thereby attached the blades 26b to the shaft 28b. In the preferred embodiment of this aspect of the present invention, the locking means 20b is in the form of a slidable sheath 62b. The slidable sheath 62b is designed to have a very close inside and outside diameter tolerance with the shaft 28b and further to slide back and forth horizontally across the shaft 28b. When the sheath 62b is slid in either horizontal direction across the shaft 28b, the blades 26b as they are attached to the shaft 28b as described earlier, are all locked in place. As the sheath 62b is slid in the opposite horizontal direction across the shaft 28b, the blades 26b are released. For purposes of illustration, in Figure 11, there is shown an enlarged exploded isometric view with motion arrows 64b showing the motion of the sheath 62b across the shaft 28b and showing how the blades 26b have been inserted into the C rings 54b, hangers 34b, holes 32b on the outside perimeter 50b of the sheath 62b and holes 30b in the shaft 28b before the blades 26b have been locked in place by the locking sheath 62b. If the locking sheath 62b then is slid across the shaft 28b in the direction of the motion arrows 64b as shown in Figure 11 then the blades 26b will be locked in place as shown in the enlarged exploded isometric view of Figure 12. It is to be understood that Figures 11 and 12 are illustrative only and if the sheath 62b were to be slid across the shaft 28b in the horizontal direction opposite the motion arrows 64b in Figure 11 to unlock the blades 26b, then the sheath 62b could be slid in the direction of the motion arrows 64b to lock the blades 26b into position. In other words, the directions the sheath 62b is slid in to lock and unlock the blades 26b are interchangeable. Referring now to Figure 10 of the drawings there is shown an exploded isometric view of the first preferred embodiment of the flail cutter 10b of the second aspect of the present invention showing how the blades 26b are attached to the flail cutter 10b of the present invention and showing the chain drive system 66b that powers the shaft 28b of the present invention as will be described in greater detail later. Figure 10 shows the locking sheath 62b as it is positioned over the rotatable shaft 28b of the present invention. The locking sheath 62b is attached to the shaft 28b by means of the bolts 68b but can be attached by any suitable means. The bolts 68b are inserted through the slots 69b in the locking sheath 62b and through the holes 70b in the shaft 28b. After the locking sheath 62b has been slid into the locked position as described previously, the locking bolt 71b is inserted into the hole 72b and secures the locking sheath 62b in place. Positioned near one end 73b of the locking sheath 62b is a false end 74b. This false end 74b secures a first hub 75b to the end 76b of the cover or shroud 77b of the flail cutter 10b as seen in Figure 9. When removed, this false end 74b allows the shaft 28b and the locking sheath 62b to be removed out through the end 76b of the flail cutter shroud 77b. The first hub 75b has within a plurality of bearings (not shown), as known in the art and as may be used in a standard trailer axle housing. Four bolts 78b are positioned through four mating holes 80b in the false end 74b to attach the false end 74b to the shroud 77b of the flail cutter 10b as seen in Figure 9. The first hub 75b is attached to the cutter axle 82b and to the false end 74b. Within the shaft 28b is the axle 82b, the axle 82b having four plugs 84b positioned thereon. The plugs 84b are welded to the inside of the shaft 28b, the plugs 84b having the same diameter as the inside diameter 86b of the shaft 28b to hold everything tightly in place inside the shaft 28b. At the end 88b of the combination shaft and locking sheath 62b opposite to the end 73b of the combination shaft 28b and locking sheath 62b near the first hub 75b there is a second hub 90b, the second hub 90b being attached on one side 91b to the axle 82b and on the second side 92b to the cutter shaft 93b, the cutter shaft 93b serving to rotate the shaft 28b by means of the chain drive system 66b. The second hub 90b also has a plurality of bearings within (not shown) similar to the first hub 75b. The second hub 90b is attached to the end 94b of the shroud 77b opposite to the end 76b of the shroud 77b that carries the false end 74b. The second hub 90b is attached to the end 94b of the shroud 77b by four bolts 95b positioned through four holes 96b in the second hub 90b and four tapped mating holes 97b in the end 94b of the shroud 77b. The cutter shaft 93b is positioned through the chain drive housing 98b and seal 99b of the chain drive system 66b as shown by the dashed line in Figure 10, the chain drive system 66b to be described in greater detail hereinafter. Figure 15 is an enlarged isometric partial view of the flail cutter of the second preferred embodiment of the second aspect of the present invention showing how the blades 26b have been easily attached to the shaft 28b of the flail cutter with the hangers 34b bolted or otherwise suitably attached to the shaft 28b. In the second preferred embodiment of this aspect of the present invention as shown in Figure 15, it can be seen that the locking means 20b in the form of a slidable sheath 62b as shown in Figure 10 has been removed and the U-shaped hangers 34b have been attached by bolts 100b or other suitable means directly to the outside perimeter 102b of the shaft 28b. The same C-ring 54b as shown in the first preferred embodiment of the present invention has been inserted through the U-shaped hanger 34b and the C ring 54b holds the pair of flail blades 60b positioned back to back. To change the blades 26b in the second preferred embodiment as shown in Figure 15, the U-shaped hangers 34b are unbolted, the C-ring 54b and blades 26b are removed from the hanger 34b, the blades 26b are replaced with new ones and returned to the C-ring 54b, the C-ring 54b is slipped back into engagement with the U-shaped hanger 34b, and the U-shaped hanger 34b is rebolted to the shaft 28b. This is an improvement over the prior art since in the present invention the hangers 34b are attached directly onto the shaft 28b such that the bolts 100b are positioned perpendicularly into the shaft 28b so they are against the shaft 28b instead of sticking out away from and parallel to the shaft 28b as in the prior art, thus keeping the bolt heads 101b from being exposed to stones or other flying debris. The bolts 100b and bolt heads 101b therefore do not become peened or damaged and are much easier to remove. It is within the spirit and scope of the present invention to attach the hangers 34b to the outside perimeter 102b of the shaft 28b in any suitable manner other than by the bolts 100b shown in Figure 15. In operation, the flail cutter 10b of the present invention is powered and caused to rotate near the ground 104b as seen in Figure 8 by means of a chain drive system shown generally by the number 66b as shown in Figure 10 and Figure 16. As the shaft 28b is rotated and carried over the ground 104b on skid shoes 106b or a roller (not shown), the rotation of the shaft 28b of the flail cutter 10b causes the blades 26b to slash into the brush 108b to be cut as seen also in Figure 8. The prior art generally uses a V-belt system to rotate the flail cutter. As these belts turn, they are caused to slip and/or break; in both instances resulting in down time for the machine and operator and resultant excess maintenance time and expense. To the contrary, the flail cutter 10b of the present invention is powered by the chain drive system 66b as shown most clearly in Figure 10 and in Figure 16. In the chain drive system 66b of the present invention the hydraulic motor 110b for the flail cutter 10b is removably mounted or bolted on the chain drive housing 98b, the chain drive housing 98b having a first hole 114b for receiving the motor shaft 116b and a second hole 118b for receiving the cutter shaft 93b. Attached to and integral with the hydraulic motor 110b is a pad or flange 120b for the motor 110b. The motor shaft 116b is positioned through the housing 98b, a seal 122b, a sprocket 124b and a locking ring 126b for locking the sprocket 124b on the motor shaft 116b. Mating holes 112b on the chain drive housing 98b match up to mating holes 112b on the flange 120b wherein the hydraulic motor 110b is bolted to the chain drive housing 98b through the mating holes 112b. The bolts 113b positioned through the flange 120b and the chain drive housing 98b are seen in Figure . As described previously with reference to Figure 10, the cutter shaft 93b is positioned as shown by the dashed lines in Figure 10 through the hole 118b in the chain drive housing 98b, a seal 99b, a sprocket 128b and a locking ring 130b for locking the sprocket 128b onto the cutter shaft 93b. Positioned between the chain drive housing 98b and a cover 132b for the chain drive system 66b is a gasket 134b. The chain drive system 66b is removable from the flail cutter 10b so as to provide easy maintenance on the motor 110b, sprockets 124b and 128b and chain 136b as seen also in Figures 10 and 16. The chain drive system 66b for the flail cutter 10b is removably mounted to the end 94b of the shroud 77b opposite the first end 76b of the shroud 77b of the flail cutter 10b by means of four bolts 138b positioned through four holes 140b in the chain drive housing 98b, four spacers 142b and four tapped mating holes 144b in the end 94b of the shroud 77b. It can also be removed and mounted on other flail cutter as an emergency replacement part. The chain drive housing 98b is also designed to provide an oil bath for the chain 136b as seen in Figure 16 and sprockets 124b and 128b to run in. This is accomplished by providing the seals 99b and 122b around both the motor shaft 116b and the cutter shaft 93b; and the gasket 134b that is positioned between the cover 132b of the chain drive system 66b and the chain drive housing 98b. Bolts 146b are inserted through tapped winged tabs 148b to hold the cover 132b in place on the chain drive system 66b. In operation, as the tractor 14b is started and the flail cutter 10b is lowered close to the ground 104b by the boom 12b of the tractor 14b as seen in Figure 8 the chain drive system 66b transfers the power provided by the hydraulic motor 110b of the flail cutter 10b to the cutter shaft 93b. Spinning the cutter shaft 93b at high revolutions per minute gives a flailing motion to the blades 26b. From the foregoing it can be seen that the applicant's invention provides an improved flail cutter for a brush cutting machine that uses a removable attaching arrangement for attaching the numerous flail blades to the rotating shaft that turns to present the blades to the brush to be cut. A locking means also insures that all the blades are held tightly in place after they have been attached to the shaft. In this way, what had been a tedious and time consuming job in the prior art has been eliminated. The flail cutter for a brush cutting machine of the present invention also powers and rotates the shaft by means of a chain drive system to provide a less maintenance intensive power system for the flail cutter. Referring now to Figures 17 to 22 of the drawings, and firstly to Figure 17 of the drawings, there is shown a front plan view of the blade assembly of the third aspect of the present invention as it is positioned on a typical brush cutting machine. Also shown in Figure 17A is an enlarged top perspective view showing the blade assembly of the present invention. In Figure 17, the brush cutting machine is shown generally by the number 10c, the brush cutting machine 10c having a front lie and sides 12c. Positioned at the side 12c of the brush cutting machine 10c is a boom 14c, having two arms 16c and 18c. The first arm 16c is closest to the brush cutting machine 10c, the second arm 18c is attached to the first arm 16c and is referred to as the dipper boom. Attached to the distal end 20c of the second arm 18c is the drive shaft 22c which attaches the blade assembly 24c to the second arm 18c or dipper boom. Attached to the drive shaft 22c is the blade assembly 24c which generally includes in part a conventional covering shroud 26c. As seen in Figures 17 and 17A, positioned under the covering shroud 26c is a crossbar 28c having a top surface 30c and a bottom surface 32c. The crossbar 28c has a first far end 34c, a second far end 36c, and a first 38c and second 40c intermediate attachment positions for attaching the blades to the crossbar 28c, as seen in Figure 18. The crossbar 28c is attached to the drive shaft 22c which rotates the crossbar 28c during operation. Attached to the bottom surface 32c of the crossbar 28c on the first far end 34c is a first blade 42c. In a similar manner, attached to the bottom surface 32c of the crossbar 28c on the second far end 36c of the crossbar 28c is a second blade 44c. The first blade 42c first utilizes the forward facing cutting edge 46c and the second blade 44c first utilizes the rearward facing cutting edge 48c, as seen in Figure 18. In operation, as the crossbar 28c rotates around a horizontal plane, the second blade 44c having the rearward facing cutting edge 48c moves into the position of the forward facing cutting edge 46c of the first blade 42c so that the two blades 42c and 44c cut the material in a circular fashion. With the blades 42c and 44c attached to the bottom surface 32c of the crossbar 28c, it can be seen in Figure 17 that the blades 42c and 44c do not swing into the drive shaft 22c that rotates the blades 42c and 44c during operation. This is an improvement over the prior art which requires a stop mechanism so that the blades do not hit the drive shaft and does not allow the free-swinging movement of the blades around an entire 360 degree cutting radius. The blades 42c and 44c of the present invention are allowed a free swinging movement around an entire 360 degree cutting radius relative to the crossbar 28c. It is, therefore, within the spirit and scope of the present invention for the blades 42c and 44c to be free-swinging relative to the crossbar 28c at any angle. The first 42c and second blades 44c attached to the bottom surface 32c of the crossbar 28c alternate between having a forward facing cutting edge 46c and a rearward facing cutting edge 48c. The following descriptions often refer to the cutting edge of the forward facing cutting edge 46c of the first blade 42c for purposes of illustration. It is to be understood however, that the same descriptions apply to the cutting edge 48c on the second blade 44c since after rotation of the blades 42c and 44c the rearward facing cutting edge 48c of the second blade 44c will be in the position of the cutting edge 46c on the first blade 42c. Figure 18 is an exploded bottom perspective view showing the blade assembly of the present invention. On Figure 18 it can be seen that the blade 42c of the blade assembly 24c is a generally rectangular metal member having two ends 50c and 52c. On each end 50c and 52c of the blade 42c there is formed a double sided cutting edge. On the one first end 50c of the blade 42c there is thus a forward facing cutting edge 46c and a rearward facing cutting edge 54c. In a similar manner, on the other second end 52c of the blade 42c there is a forward facing cutting edge 56c and a rearward facing cutting edge 58c that are reversed in vertical position from the forward facing cutting edge 46c and rearward facing cutting edge 54c on the first end 50c of the blade 42c. In operation, the forward facing cutting edge 46c of the first end 50c of the blade 42c is first presented to the ground 60c and to the brush 62c to be cut, as seen in Figure 17. A single cutting edge on each of the two blades 42c and 44c is therefore used at any given time in the operation. In Figures 17 and 18 it can further be seen that the blade 42c carries two holes proximate to each end 50c and 52c. The first end 50c of the blade 42c has counter bored holes 64c and 66c which go unused when the forward facing cutting edge 46c is the cutting edge in service. The counter-bored hole 64c is drilled to have its diameter 68c at the lower surface 70c of the blade 42c to be larger than its diameter 72c at the upper surface 74c of the blade 42c. The counter-bored hole 66c is drilled to have its diameter 76c at the lower surface 70c of the blade 42c to be smaller than its diameter 78c at the upper surface 74c of the blade 42c. In a similar fashion the second end 52c of the blade 42c also has counter-bored holes 80c and 82c proximate thereto. The counter-bored hole 80c is drilled to have its diameter 84c at the lower surface 70c of the blade 42c to be larger than its diameter 86c at the upper surface 74c of the blade 42c. And, the counter-bored hole 82c is drilled to have its diameter 88c at the lower surface 70c to be smaller than its diameter 90c at the upper surface 74c of the blade 42c. When the cutting edge 46c is used, it can be seen in Figures 18, 20A and 20B that the counter-bored hole 82c is the corresponding hole used to attach the blade 42c to the crossbar 28c. The counter- bored hole 82c having a larger diameter 90c at the lower surface 70c of the blade 42c than at the upper surface 74c of the blade 42c serves to recess the head 92c of the attaching bolt 94c from the lower surface 70c of the blade 42c. When the forward facing cutting edge 46c is the cutting edge in service, the blade 42c is attached to the crossbar 28c by the attaching bolt 94c being positioned through the lower surface 70c of the blade 42c, at the hole 80c in the blade 42c and then through the bottom 32c and top 30c surfaces of the crossbar 28c. The blade 44c is the same as the blade 42c in reversed or turned over position. So the hole 64c in the blade 42c is the same as hole 64'c in the blade 44c if the blade 42c were turned over; the hole 66c in the blade 42c is the same as the hole 66'c in blade 44c if blade 42c were turned over; the hole 80c in the blade 42c is the same as hole 80'c in the blade 44c if the blade 42c were turned over; and the hole 82c in the blade 42c is the same as hole 82'c in the blade 44c if the blade 42c were turned over. In the preferred embodiment of the present invention, the crossbar portion 28c of the subject blade assembly 24c is attached to the drive shaft 22c of the brush cutting machine 10c by four securing bolts 96c, 98c, 100c, 102c, positioned through corresponding holes 97c, 99c, 101c and 103c in the crossbar 28c, the drive shaft 22c serving to rotate the crossbar 28c and consequently the blades 42c and 44c. Surrounding the holes 97c, 99c, 101c, and 103c, the top surface 30c of the crossbar 28c has a recess 104c for attaching the crossbar 28c to the drive shaft 22c such that the shock from operation of the brush cutting machine 10c is absorbed by the drive shaft 22c instead of the bolts 96c, 98c, 100c and 102c. The recess 104c is shown in the top perspective views of Figures 24 and 25. The crossbar 28c includes a counter-bored hole 105c at its first far end 34c and a counter-bored hole 106c at its first intermediate attachment position 38c, the counter-bored holes 105c and 106c corresponding to the counter-bored holes 64c, 66c, 80c and 82c in the first blade 42c. Similarly, the crossbar 28c has a counter- bored hole 108c at its second intermediate attachment position 40c and a counter-bored hole 110c at its second far end 36c which correspond to the holes 64'c, 66'c, 80'c, and 82'c in the second blade 44c. Since the crossbar 28c is not turned when a cutting edge is changed, the counter bored holes 105c, 106c, 108c and 110c in the crossbar 28c all have the larger diameter 112c of the hole at the bottom surface 32c of the crossbar 28c and the smaller diameter 114c at the top surface 30c of the crossbar 28c. The four counter-bored holes 105c, 106c, 108c and 110c in the crossbar 28c are provided to maintain the length of the blade 42c at the same length relative to the cutting machine 10c regardless of which cutting edge 46c, 54c, 56c, 58c is the cutting edge in use. The hole 105c is positioned at the first 34c far end of the crossbar 28c and is used when the cutting edge in use utilizes the hole 66c or 80c in the first blade 42c that is inward from the ends 50c or 52c of the blade 42c. The hole 106c is positioned in the first 38c intermediate attaching position and is used when the cutting edge in use utilizes a hole 64c or 82c in the first blade 42c that is outward to the ends 50c or 52c of the first blade 42c. Similarly, the hole 110c is positioned at the second far end 36c of the crossbar 28c and is used when the cutting edge in use utilizes the hole 66'c or 80'c in the second blade 44c that is inward from the ends 50'c or 52'c of the second blade 44c. The hole 108c is positioned in the second intermediate attachment position 48c and is used when the cutting edge in use utilizes a hole 64'c or 82'c in the second blade 44c that is outward to the ends 50'c or 52'c in the second blade 44c. This serves to position the blades 42c and 44c away from the sides 12c and tires 116c of the cutting machine 10c as the blades 42c and 44c are rotated. In use, when one of the four available cutting edges 46c, 54c, 56c, and 58c is chosen to be put in the using position as cutting edge 46c in Figures 18 and 20A and 20B, an abruptly graduated diameter attaching bolt 94c is positioned through the counter-bored hole 82c in the second end 52c of the blade 42c opposite the cutting edge 46c in use, so that the head 92c of the bolt 94c is recessed from the lower surface 70c of the blade 42c that is presented to the ground 60c. The portion 118c of the bolt 94c that exits from the upper surface 74c of the blade 42c is then positioned through the corresponding counter-bored hole 106c in the first intermediate attaching position 38c of the crossbar 28c such that the smallest diameter 84c of the hole 82c in the blade 42c matches the largest diameter 112c of the corresponding counter-bored hole 106c in the crossbar 28c. In this way, a bolt 94c is used with a large diameter 120c at its top 122c closest to its head 92c for a strong, secure attachment, while having a smaller diameter 124c at its screw end 126c for easy securement of the bolt 94c at the top surface 30c of the crossbar 28c with a more manageably sized nut 128c. The top surface 30c of the crossbar 28c, the upper surface 74c of the blade 42c and the engagement of the nut 128c over the attaching bolt 94c is seen most clearly in the side plan view of Figure 19. Figure 18 of the drawings is an exploded bottom perspective view of the present blade assembly 24c as it fits together during operation. The attaching bolt 94c used in the present blade assembly 24c has a head 92c that is recessed into the lower surface 70c of the blade 42c so that the top 130c of the bolt head 92c is flush with the lower surface 70c of the blade 42c, as described with reference to Figure 17. The lower surface 70c of the blade 42c is presented to the ground 60c during use and as the blade 42c moves along the ground 60c it will strike hard material such as rocks or debris. With the head 92c of the bolt 94c recessed into the lower surface 70c of the blade 42c, the head 92c of the bolt 94c will not be chipped, cracked or otherwise compromised upon hitting a hard object. In the preferred embodiment of this aspect of the present invention, at least 7/8 inch metal is used to form the blade 42c. In this way, with the head 92c of the bolt 94c being recessed into the lower surface 70c of the blade 42c, the head 92c of bolt 94c is surrounded by thick metal protecting the head 92c of the bolt 94c even further. There is thereby afforded greater safety to the machine operator, and bystanders. Frequent replacement of a damaged bolt or consequently damaged blade is avoided reducing maintenance and expense and providing greater convenience for the operator. As explained with reference to Figure 17, and shown more clearly in Figure 18, the body 132c of the attaching bolt 94c used in the present blade assembly 24c has a larger diameter 120c at its top 122c, near the head 92c of the bolt 94c, than at its screw end 126c. The body 132c of the attaching bolt 94c has an abrupt change in diameter at a position 134c in its length that corresponds to and is slightly longer than the depth 136c of the blade 42c. In assembly and operation then, the counter-bored hole 82c used in the blade 42c has an upper diameter 88c slightly larger than the diameter 138c of the head 92c of the bolt 94c to recess the head 92c of the bolt 94c into the lower surface 70c of the blade 42c. The body 132c of the bolt 94c has a diameter 120c at its top 122c near the head 92c of the bolt 94c, which corresponds to the smaller diameter 86c of the counter- bored hole 80c inside the blade 42c at the upper surface 74c of the blade 42c. The attaching bolt 94c of the blade assembly 24c is then positioned through the corresponding hole 106c in the bottom surface 32c of the crossbar 28c. The larger diameter 112c of the hole 104c at the bottom surface 32c of the crossbar 28c is the same as the diameter 90c of the hole 82c in the upper surface 74c of the blade 42c which corresponds to the smaller diameter 124c of the screw end 126c of the bolt 94c. The body 132c of the bolt 94c then has an abrupt change in diameter so that the screw end 126c of the bolt 94c that comes out through the top surface 30c of the crossbar 28c is smaller than the diameter 120c of the bolt 94c that goes through the bottom surface 32c of the crossbar 28c. This graduation in the diameters of the holes 104c, 106c, 108c, and 110c in the crossbar 28c is done to accommodate the substantial body of the bolt 94c or pin used to hold the blade 42c in place for safety reasons, while at the same time allowing a reasonably sized nut 128c to be used to secure the screw end 126c of the bolt 94c which comes out through the top surface 30c of the crossbar 28c. The attaching bolt 94c and the configuration of counter-bored holes in the blade 42c and the crossbar 28c generally comprise the attaching means of the present blade assembly 24c. As described with reference to Figures 17, 18 and 19 then, when the cutting edge 46c is being used as shown with the cutting edge 46c in the using position in Figures 20 and 20B, the attaching bolt 94c is positioned through the corresponding and counter-bored hole 82c in the blade 42c and then positioned through the corresponding and counter-bored hole 106c in the first far end 34c of the crossbar 28c. Similarly, to attach the second blade 44c to the second far end 36c of the crossbar 28c, using the cutting edge 48c, the attaching bolt 94c is positioned through the counter-bored hole 82'c in the blade 44c and then positioned through the corresponding and counter-bored hole 110c in the crossbar. When the cutting edge 46c has dulled and it is desired to alternate the cutting edge on the job before the cutting edge 46c can have its bevel re-cut to provide a resharpened cutting edge, the blade 42c can be rotated from side to side or front to back to take advantage of any of the three remaining cutting edges 54c, 56c, and 58c. When it is desired to use the cutting edge 54c, as seen in Figures 21A and 21B, the attaching bolt 94c is removed and the blade 42c is turned over in a vertical plane from top to bottom so that the cutting edge 54c is now forward facing. The counter-bored hole 80c in the blade 42c that will be used to attach the blade 42c to the crossbar 28c when the cutting edge 54c is being used, has a reverse counter-bore of that described with reference to hole 82c in the blade 42c. With the blade 42c turned over then, the hole 80c now has the same counter-bore configuration as that described with reference to Figure 17 and hole 82c. In order to complement the hole 80c in the blade 42c, with the hole 105c in the crossbar 28c as described with reference to Figures 17, 18 and 19 the counter-bored hole 105c used in the crossbar 28c has the larger diameter 112c at the bottom surface 32c of the crossbar 28c to accept the corresponding diameter 120c in the body 132c of the bolt 94c as it is positioned through the upper surface 74c of the blade 42c. In a like manner, to attach the second blade 44c to the second far end 36c of the crossbar 28c, using the cutting edge 54'c, the attaching bolt 94c is positioned through the counter-bored hole 80'c in the blade 44c and then positioned through the corresponding and counter-bored hole 110c in the crossbar 28c. Similarly, when the cutting edge 54c is dulled and it is desired to rotate the blade 42c from side to side to now use the cutting edge 58c, the attaching bolt 94c and the blade 42c are removed, the blade 42c is turned end over end in a horizontal plane and the cutting edge 58c is now facing forward, ready for use in the cutting position. When the cutting edge 58c is being used, it can be seen then in Figures 22A and 22B that the attaching bolt 94c and the blade 42c are first removed, the blade 42c has been turned over from end to end and then the attaching bolt 94c is positioned through the counter-bored hole 64c in the blade 42c and through the corresponding counter-bored hole 106c in the first far end 34c of the crossbar 28c. To attach the second blade 44c to the second far end 36c of the crossbar 28c, using the cutting edge 58 'c, the attaching bolt 94c is positioned through the counter-bored hole 64'c in the blade 44c and then positioned through the corresponding and counter-bored hole 108c in the crossbar 28c. Also, in a similar fashion, to take advantage of the yet unused cutting edge 56c, the attaching bolt 94c and blade 42c are again removed, the blade 42c is turned in a vertical plane from top to bottom and then the attaching bolt 94c is positioned through the counter- bored hole 66c in the blade 42c and through the corresponding counter-bored hole 105c in the crossbar 28c, as seen in Figures 23A and 23B. To attach the second blade 44c to the second far end 36c of the crossbar 28c, using the cutting edge 56'c, the attaching bolt 94c is positioned through the counter-bored hole 66 'c in the blade 44c and then positioned through the corresponding and counter-bored hole 110c in the crossbar 28c. In the use of all four of the cutting edges 46c, 54c, 58c and 60c then, the cutting edge is forward facing from the front end lie of the machine 10c. When the blade 42c is turned either from front to back or side to side then, the hole in the blade 42c which has the largest lower diameter and is on the opposite end of the blade 42c away from the cutting edge in use, will be used to position the attaching bolt 94c through and into the crossbar 28c. The attaching bolt 94c will always go through the lower surface 70c of the blade 42c having the head 92c of the bolt 94c recessed from the lower surface 70c of the blade 42c, no matter which cutting edge is in use. The attaching bolt 94c is then positioned through the bottom surface 32c of the crossbar 28c and will exit through the top surface 30c of the crossbar 28c where the nut 128c will be secured to the screw end 126c of the bolt 94c. It can be seen therefore that with a minimum of time and expense, the operator has four cutting edges available on each blade 42c or 44c at the job while having only two blades attached to the cutting machine 10c. When the four cutting edges 46c, 54c, 56c and 58c or 48c, 54'c, 56'c and 58'c on either blade 42c or 44c of the present blade assembly have all been dulled and consequently rotated or inverted so that all' four cutting edges 46c, 54c, 56c and 58c have been used, the blades 42c and 44c can be returned to the shop where each one of the cutting edges 46c, 48c, 54c, 56c, 58c, 54'c, 56'c and 58'c can have a new bevel cut thereby providing four new cutting edges to each blade 42c or 44c. Because of the thicker metal of the present blade 42c, it is possible to re-cut a new bevel for each cutting edge 46c, 54c, 56c and 58c at least once thereby making the present blade assembly 24c even more convenient and economical to use. In a second embodiment of the present blade assembly as seen in Figure 25, there is shown an alternative crossbar to that shown in Figures 17 and 18. In Figure 25 the alternative crossbar 140c is curved in its horizontal plane to provide offsets 141c and 142c for the cutting edges 46c and 48c in use so that the cutting edges 46c and 48c in use are brought closer to the ground 60c and to the brush 62c to be cut. In this way, it can be seen that the curved crossbar arrangement 140c of Figure 25 provides a closer cut of the brush 62c. An advantage of this second embodiment is that should the operator wish to have the option available at the site of the closer cutting second embodiment or the more generous cut with the first embodiment, the improved blade or a thinner version thereof of the present invention, can be used for either cut desired. Thus, the operator does not have to bring along a more conventional blade with an offset if he wishes to take advantage of the closer cutting offset. From the foregoing it can be seen that the applicant's invention provides an improved blade assembly that provides four cutting edges on each blade that are rotatable and invertible to take advantage of all four cutting edges; the cutting edges are re-cuttable providing resharpened cutting edges; a counter-bored attachment configuration has been provided so that the top of the head of the attaching bolt is flush with the lower surface of the blade prolonging the life of the attaching bolt; and a graduated diameter bolt is used having a large diameter body for a secure attachment of the blade to the crossbar while having a smaller diameter screw end for receiving a bolt. Referring now in general to Figures 26 to 32 of the drawings, and firstly to Figure 26 of the drawings, there is shown a front perspective view showing how the blade of the fourth aspect of the present invention is positioned on a conventional flail cutter of an existing brush cutting machine. In Figure 26 the brush cutting machine is shown generally by the number lOd and the flail cutter is shown generally by the number 12d. It can be seen in Figure 26 that the conventional flail cutter 12d generally comprises a shaft 14d having a plurality of holes 16d positioned through the outer surface 18d of the shaft 14d. This plurality of holes 16d holds a plurality of tabs or hangers 20d, the hangers 20d in turn each holding blades 22d of the present invention. These hangers 20d are positioned on the shaft 14d in pairs and hold two blades 22d back to back. In Figures 26 and 28, it can be seen that the blade 22d of the present invention is a generally L-shaped member comprising a stem 24d and a floor 26d, the blades 22d being attached to a hanger 20d by the attaching means 28d in the form of a hole 30d in the stem 24d of the blade 22d. In Figure 26 showing a conventional flail cutter, it can be seen that the hangers 20d are each welded onto the shaft 14d in pairs. The hangers 20d provide a means for attaching the blades 22d to the shaft 14d as will be shown and described in greater detail with reference to Figure 31. In the preferred embodiment of this aspect of the present invention, the blade 22d is torch cut such that there is a ninety degree angle 32d between the stem 24d and floor 26d of the blade 22d. The floor 26d of the blade 22d carries the cutting edge 34d of the blade 22d; thus the floor 26d and the cutting edge 34d of the blade 22d are presented parallel to the ground 36d and the brush 38d to be cut, thereby cutting the brush 38d evenly and close to the ground 36d. The advantage of the right angle 32d configuration of the present blade becomes clear when the right angle 32d configuration of the present blade as shown in Figures 28 and 29 is compared to the obtuse angle 40d configuration of the prior art blade 42d as shown in Figure 27. The prior art blade 42d for a flail cutter as shown in Figure 27 is generally formed by strips cut out of a relatively thin piece of metal. These strips are then bent to form the obtuse angle 40d between the stem 44d and floor 46d of the prior art blade 42d. By forcing a bend in the metal, the prior art blade 42d thus lacks integrity and is easily broken or bent entirely out of useable shape upon hitting a rock or other hard object. It can also be seen in Figure 27 that the prior art blade is bent to have an obtuse angle 40d between its stem 44d and floor 46d since to bend it further into the right angle configuration 32d of the blade 22d of the present invention would only reduce the already poor integrity of the prior art blade 42d even more. Thus, it can be seen that the prior art blade 42d is caused to be angled up and away from the ground 36d and the brush 38d to be cut thereby causing an uneven and not close cut of the brush 38d. By contrast, the blade 22d of the present invention is formed by torch cutting the blade 22d, cutting edge 34d and attaching hole 30d from a thicker piece of metal. In this way, any desired angle can be cut between the stem 24d and floor 26d of the blade 22d; any desired configuration can be formed for the attaching means 28d in the form of an attaching hole 30d in the stem 24d of the blade 22d; and any desired cutting edge 34d can be formed. It is also within the spirit and scope of the invention to cast the blade 22d, to have any desired angle between the stem 22d and floor 26d of the blade, any desired configuration for the attaching means 28d in the form of an attaching hole 30d in the stem of the blade 22d; and any desired cutting edge 34d can also be formed by casting. Referring now to Figure 28 of the drawings, there is shown a side perspective view of the present invention. It can be seen in the preferred embodiment of Figure 28 that a ninety degree angle 32d is formed between the stem 24d and floor 26d of the blade 22d of the present invention. This ninety degree angle 32d is the most beneficial for achieving a close cut of the brush 38d. The ninety degree angle 32d cut is therefore preferred for airports, golf courses and the like. It is, however, within the spirit and scope of the invention to have any desired angle between the stem 24d and floor 26d of the blade 22d. For example, an angle of greater than ninety degrees can be used to cut heavier brush where a less close cut is desired. The preferred angle of ninety degrees 32d will still cut the heaviest of brush 38d, however, and will cut the brush 38d closest to the ground 36d. It can be seen further in Figure 28 that on the floor 26d of the blade 22d there is also torch cut the cutting edge 34d of the blade 22d. Because of the torch cut process by which the blade 22d is formed, the cutting edge 34d of the blade 22d can also be cut to any configuration desired. Also, because the cutting edge 34d is torch cut from a thicker metal, the cutting edge 34d of the present flail blade 22d is resharpenable or more specifically completely renewable. By re-torch cutting the blade 22d, the cutting edge 34d of the blade 22d becomes completely renewable. In removing part of the material of the cutting edge 34d by torch cutting a new cutting edge, any nicks or other missing chunks of metal in the existing cutting edge 34d are removed. This is an obvious advantage over the prior art which if it is resharpenable, it only resharpens the existing cutting edge with a grinder or other similar means, leaving the cutting edge as it is with all nicks and other cut reducing flaws intact. Renewing the blade 22d of the present invention is accomplished by removing the dull blade 22d, again torch cutting a new cutting edge 34d and returning the blade 22d to the flail cutter 12d. This represents a distinct advantage over the prior art blade 42d which must be replaced after it is dulled with associated maintenance time and expense. Also seen in Figure 28 is the attaching means 28d in the form of an attaching hole 30d on the stem 24d of the blade 22d for attaching the blade 22d onto a hanger 20d which in turn attaches to the shaft 14d of the flail cutter 12d as seen in Figure 26. There are a plurality of hangers 20d welded to the shaft 14d. These hangers 20d are positioned on the shaft 14d in pairs and each pair of hangers 48d holds two blades 22d back to back, so that each of the two blades 22d can, be reversed, to present a new cutting edge 34'd. These pairs of hangers 48d are spaced an equal distance apart between rows 50d and are staggered intermittently as between columns 52d. Each pair of hangers 48d has a hole 54d therethrough for receiving a bolt 56d which in turn is inserted through a C-ring 58d and the pair of hangers 48d as seen in Figure 31. The C-rings 58d each carry a pair of blades 22d positioned back to back. In the preferred embodiment of this aspect of the present invention, the attaching means 28d in the form of an attaching hole 30d in the blade 22d for attaching the blade 22d to the C-ring 58d is an elliptical shape 60d to provide more room for the blade 22 to slide on the ring portion 62d of the hanger 20d. An elliptical shape 60d for the attaching hole 30d which attaches the blade 22d to the flail cutter 12d, allows the blade 22d to swing back and forth more readily as it swings by the brush 38d to be cut. With more movement of the blade 22d accomplished in this way a more certain cut of the brush 38d is assured. Since the attaching hole 30d part of the blade 22d is also torch cut, it too can be cut to any shape desired. It is therefore, also within the spirit and scope of the invention to form the attaching hole 30d into any desired shape. For example, a round hole 63d would be used to accommodate existing flail cutters 12d that use a round attaching hole 63d for attaching the blade 22d to the hanger 20d as seen in Figure 32. Since, in operation, the blades 22d are positioned back to back in pairs it is also within the spirit and scope of the invention to torch cut or cast two or more blades 22d together in a one piece integral unit. It can be seen therefore in Figure 30 that to produce the blade 22d of the present invention is a simple and inexpensive procedure. In practice, the blades 22d of the present invention are very simply torch cut from a sheet of one and one half inch metal, although any suitable width and type of metal can be used. In the preferred embodiment of this aspect of the present invention the blade 22d formed is at least 5/16 inch thick, thus providing a thicker and more substantial blade capable of cutting thicker and heavier brush. Also, in the preferred embodiment, with a ninety degree angle 32d cut between the stem 24d and floor 26d of the blade 22d, a number of blades 22d are easily cut from the same piece of metal. Also, as seen in Figure 30, the back 64d of one blade 66d provides the front 68d for the next blade 70d to be cut thereby assuring little waste and a minimum of torch cuts to provide the most blades 22d. From the foregoing it can be seen that the applicant's invention provides an improved blade for a flail type brush cutting machine that is formed of heavy metal and thereby cuts heavier brush; the blade provides a ninety degree angle between the stem and the floor of the blade to insure a close cut of the brush with greater integrity and less breakage of the blade; a resharpenable and renewable cutting edge on the blade is provided to reduce maintenance and replacement costs and improve the efficiency of the blade; and an attaching means in the form of an attaching hole for attaching the blade to a hanger is provided in any desired shape for easy and efficient attachment of the blade to the flail cutter. Variation in the structure of the invention and the arrangement of the various parts are within the spirit and scope of the applicants invention. The embodiments given have been given only by way of illustration and the applicant is not to be limited to the embodiments shown and described.

Claims: CLAIMS 1. A control assembly for controlling the movement of a blade assembly of a cutting machine, the blade assembly having a center portion and a cutting portion, the blade assembly being used to cut brush on the ground, comprising: rotating means having a top and a bottom, the top having an upper surface and a lower surface, the top of the rotating means being releasibly attached to a boom, the bottom having an upper surface and a lower surface, the bottom of the rotating means being attached at its upper surface to the top of the rotating means and at its lower surface to the blade assembly, the top and bottom of the rotating means being caused to rotate together by a control means, the rotating means rotating in response to and together with the top of the rotating means, the bottom of the rotating means in turn causing the blade assembly to rotate; and whereby the rotating means rotates the blade assembly relative to the boom so that the cutting portion of the blade assembly faces forwardly into the material to be cut. 2. A method for controlling the movement of a blade assembly of a cutting machine with a control assembly, the blade assembly having a center portion and a cutting portion, the blade assembly being used to cut material on the ground comprising the steps of: a) providing a rotating means, the rotating means having a top and bottom, the top of the rotating means being releasibly attached to the boom, the bottom of the rotating means being attached at a first side to the top of the rotating means and at a second side to the blade assembly; b) rotating the control assembly with the rotating means, the top of the rotating means being caused to rotate by a control means, the bottom of the rotating means rotating in response to and together with the top of the rotating means, the bottom of the rotating means in turn causing the blade assembly to rotate; and whereby the blade assembly is rotated by the rotating means so that the cutting portion of the blade assembly faces forwardly into the material to be cut. 3. A flail cutter for a brush cutting machine, the flail cutter having blades and comprising: a) a rotatable generally cylindrical member; b) a plurality of one piece attaching means, each of the one piece attaching means attached to the generally cylindrical member; and c) a plurality of holding means removably attached to the attaching means, each holding means holding at least one blade of the flail cutter. 4. A flail cutter for a brush cutting machine, the flail cutter having blades and comprising: a) a rotatable generally cylindrical member having a plurality of first receiving means positioned thereon; b) a locking means having a plurality of second receiving means positioned thereon, the plurality of second receiving means positioned over the plurality of first receiving means; c) a plurality of attaching means, each attaching means attached to one of the first and second receiving means; and d) a plurality of holding means, each holding means removably attached to one of the attaching means, each holding means holding at least one blade, each holding means thereby attaching at least one blade to each of the attaching means. 5. A method for providing a flail cutter for a brush cutting machine, the flail cutter having blades, comprising the steps of: a) providing a rotatable generally cylindrical member having a plurality of first receiving means positioned thereon; b) providing a locking means having a plurality of second receiving means positioned thereon, the plurality of second receiving means positioned over the plurality of first receiving means; c) providing a plurality of attaching means; d) attaching each attaching means to one of the first and second receiving means; e) providing a holding means; and f) removably attaching each of the attaching means to one of the holding means, each holding means holding at least one blade, each holding means thereby attaching at least one blade to each of the attaching means. 6. A blade assembly for a brush cutting machine, the cutting machine having two sides and a crossbar, the crossbar having a top surface, a bottom surface and at least one hole positioned therethrough, the blade assembly comprising: a) a generally rectangular metal member having a first and second ends, an upper surface and a lower surface, and having at least two cutting edges on the first end, including one forward facing cutting edge and one rearward facing cutting edge, and at least one cutting edge on the second end, including a forward facing cutting edge, the cutting edges each having a bevel; b) an attaching means for attaching the metal member to the bottom surface of the crossbar, the metal member being free swinging relative to the crossbar; and whereby the metal member is rotatable from the first end to the second end and is invertible from the upper surface to the lower surface. 7. A method for cutting brush using a brush cutting machine, the brush cutting machine having two sides and a crossbar, the crossbar having a top surface, a bottom surface and at least one hole positioned therethrough comprising the steps of: a) providing a blade assembly comprising a generally rectangular metal member having a first and second ends, an upper surface and a lower surface; i) providing at least two cutting edges on the first end of the metal member, including one forward facing cutting edge and one rearward facing cutting edge, the cutting edges each having a bevel; ii) providing at least one cutting edge on the second end of the metal member, including a forward facing cutting edge, the cutting edge having a bevel; b) providing an attaching means for attaching the metal member to the bottom surface of the crossbar, the metal member being free swinging relative to the crossbar; c) inverting the metal member from the upper surface of the metal member to the lower surface of the metal surface after the forward facing cutting edge on the first end of the metal member is dulled, thereby positioning the rearward facing cutting edge on the first end of the metal member forwardly in cutting position; and d) rotating the metal member from the first end to the second end after the forwardly facing cutting edge thus positioned as a result of the step c is dulled, thereby positioning the forwardly facing cutting edge on the second end of the metal member forwardly in cutting position. 8. A blade for a flail type brush cutting machine comprising: a metal member comprising; a) a torch cut or cast floor extending horizontally in parallel relationship to a ground surface, the floor having a cutting edge; b) a torch cut or cast stem integral with the floor, extending generally vertically at any angle from the floor, the stem having a attaching means for attaching the blade to a flail cutter; and whereby more than one blade may be integrally formed together in a one piece unit by the torch cut or cast process. 9. A method for producing a blade for a flail type brush cutting machine comprising the steps of: a) providing a metal member; b) torch cutting or casting the metal member to form a floor of the blade extending horizontally in parallel relationship to a ground surface, the floor having a cutting edge; c) further torch cutting or casting the metal member to form a stem of the blade integral with the floor of the blade, the stem extending generally vertically at any angle from the floor of the blade, the stem having an attaching means for attaching the blade to a flail cutter; and whereby the cutting edge on the floor of the blade is disposed on the same plane and even with the brush to be cut, and whereby more than one blade may be integrally formed together in a one piece unit by the torch cut or cast process.

Inventors: DALLMAN JIMMIE JAY, DALLMAN, JIMMIE, JAY
Applicants: DALLMAN JIMMIE JAY, DALLMAN, JIMMIE, JAY
Application year: 1995
Main classification: A01D34
IPC codes: A01D34