Abstract:
A tool and method for making precision cuts with conventional saws and other woodworking machines. The shape of an inside or outside corner of a construction, such as a wall construction, is obtained with the tool, and the tool is used to as a guide to set the blade of the cutting apparatus to the proper cutting position. The tool may be used to indicate the miter cuts for both inside and outside wall corners without having to measure the angle with a measuring tool and determine the precise degrees of the angles to be cut.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation-in-part of U.S. Ser. No. 12/831,236, filed on Sep. 24, 2010, which is a continuation-in-part of U.S. Ser. No. 12/694,523, filed on Jan. 27, 2010, both of which are incorporated by reference in their entireties. 
    
    
     TECHNICAL FIELD 
     Disclosed is a tool for use with construction projects. The tool may be used in the field of carpentry to indicate accurate wall corner shapes for cutting mitres, such as baseboard molding, chair rail molding, crown molding, and the like. 
     BACKGROUND 
     Carpenters must frequently join materials at an angle in a manner commonly known as a mitre or coped joint. A mitre joint typically consists of two pieces of material that are joined at a corner, where each of the pieces is cut at a bisecting angle of the corner shape requiring the mitre joint. Mitre joints are used on molding surrounding doors, windows, floor bases, and stair cases as well as in other locations. As doors, windows, walls, and staircases are frequently not perfectly square due to natural imperfections, the actual angle required for the mitre joint must first be determined and then the materials cut to this angle. 
     Problems exist with current methods with regards to translating the measured mitre angle into a finish cut on the material to be joined. Imprecision between the scales of the device used for measuring the required mitre angle and of the cutting apparatus can result in inaccurate mitre cuts, resulting in mitre joints that are not mated properly. Also, human imprecision is added when the operator must read one scale on the measurement device and transfer the value to another scale on the cutting machine. 
     For many years, baseboard moldings, chair rail molding, cornice molding, etc. have been cut on a fixed mitre box. Some of the known fixed mitre boxes were manufactured from wood, steel, aluminum, or plastic. Fixed mitre boxes are virtually useless in making most angled mitre cuts accurately. In addition, the fixed mitre boxes only include precut mitre angle slots designed to cut 45, 60 and 90 degree angles. After several cuts through the same precut angle slot on a fixed mitre box, the angle slots become wider and wider until it is impossible to cut an accurate mitre. 
     More recently, circular adjustable angle mitre saws and radial arm saws have been used for cutting mitre angles. The latest generation of circular adjustable mitre saws also includes laser projection of the saw blade plane in attempt to guide the user in making more precise cuts. Prior to the use of the circular adjustable angle mitre saws, a pivoting manual saw was also used for cutting mitre angles. 
     Adjustable angle saws, both circular and manual, and radial arm saws still require that one first determine the angle of the corner in degrees and then set the mitre saw at the proper mitre cut line. If one does not accurately determine the angle of the corner in degrees, then the mitre cut will be incorrect and the piece of cut molding will be scrap material. Thereafter, the person making the mitre cuts must proceed to make further adjustments on the degree cut line with the hope that eventually an accurate mating joint will be cut. 
     It has always been an educated guess to determine the inside or outside angle of room corners in degrees, which is followed by a few trial and error cuts until one achieves an accurate mitre joint. The intersecting walls forming room corners should be 90 degrees, however, in many wall constructions this may not be entirely true. In fact, the room corners may often be up to 2 or 3 degrees off square. Consequently, if one cut perfect 45 degrees intersecting mitre cuts, the cut pieces of molding would not mate accurately. 
     As shown in  FIG. 13 , up to the present time, a very tedious and time consuming method used to determine a mitre cut without estimating or otherwise guessing at the angle of the corner is to use a 3″ or 4″ wide board placed flat on the floor against one wall and scribe a line on the floor away from the corner along the outside edge of the board. The same tedious method would then need to be performed on the other wall to scribe a line intersecting the scribe line from the first wall. The line drawn from the corner of the wall to the intersecting scribe lines on the floor is the mitre cut line that one would then need transfer to the saw deck using an adjustable square with or without an angle scale in degrees. A more tedious method of cutting 90 degree inside corner mitres was to trace the molding scroll pattern on one member and cut out the scroll pattern with a coping saw to mate with the other member. This method could only be used on 90 degree inside corners. 
     Because of the difficulty in judging the proper angles for the mitre cuts, one would be forced to make multiple cuts to arrive at accurate mating mitres, or simply caulk the inaccurate mitre to cover up a bad mitre joint. 
     The national average for carpenter wages is estimated to be about $30 per hour. Inaccurate mitre cuts result in increased labor costs and wasted material, which severely affect the profitability of a particular construction job for the carpenter. In addition, the wasted wood material also has a detrimental impact on the environment. 
     What is still needed in the art is a tool to accurately and easily determine the proper molding mitre cut plane without the need for measuring angles in degrees in order to achieve accurate and precise mitre cuts for both inside and outside corners. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1A  is a plan view of an illustrative embodiment of the mitre tool arranged for indicating the shape of inside wall corners and subsequent mitre cut plane. 
         FIG. 1B  is a plan view of an illustrative embodiment of the mitre tool arranged for indicating the shape of outside wall corners and subsequent mitre cut plane. 
         FIG. 1C  is another plan view of an illustrative embodiment of the mitre tool in another position and showing a slide arm held by guides mounted at pivot points. 
         FIG. 1D  is a plan view of another illustrative embodiment of the mitre tool showing of an alternative embodiment of the slide arm. 
         FIG. 1E  is a fragmentary side view of one illustrative slide arm guide in combination with a slotted slide arm. 
         FIG. 1F  is a plan view of another illustrative embodiment of the mitre tool without a slide arm. 
         FIG. 1G  is a fragmentary side view of one illustrative lockable member in combination with the arms of the mitre tool. 
         FIG. 2A  is a plan view of an illustrative embodiment of the mitre tool at various positions on a saw deck for making left hand and right hand inside wall corner mitre cuts. 
         FIG. 2B  is a plan view of an illustrative embodiment of the mitre tool positioned on a saw deck for making right hand inside wall corner mitre cuts. 
         FIG. 2C  is a plan view of an illustrative embodiment of the mitre tool positioned on a saw deck for making left hand inside wall corner mitre cuts. 
         FIG. 2D  is a plan view of the illustrative embodiment of the mitre tool incorporating a slotted slide arm as shown in  FIG. 1D  positioned on a saw deck for making right hand inside wall corner mitre cuts. 
         FIG. 2E  is a plan view of the illustrative embodiment of the mitre tool incorporating a slotted slide arm as shown in  FIG. 1D  positioned on a saw deck for making right hand inside wall corner mitre cuts. 
         FIG. 2F  is a plan view of the illustrative embodiment of the mitre tool as shown in  FIG. 1G  in an inverted position on a saw deck for making right hand inside wall corner mitre cuts. 
         FIG. 2G  is a plan view of the illustrative embodiment of the mitre tool as shown in  FIG. 1F  in an inverted position on a saw deck for making left hand inside wall corner mitre cuts. 
         FIG. 3A  is a plan view of the space adapter for the mitre tool and is used for positioning the mitre tool on the saw deck when cutting outside wall corner shapes and is attached to one of the pivotable arms of the mitre tool. 
         FIG. 3B  is an end view of an arm of the space adapter shown in  FIG. 3A . 
         FIG. 3C  is an end view of an arm of the space adapter shown in  FIG. 3A . 
         FIG. 3D  is a perspective view of another illustrative embodiment of the space adapter. 
         FIG. 3E  is a side view of the illustrative embodiment of the space adapter. 
         FIG. 3F  is a fragmentary view of a portion of the illustrative embodiment of the spacer adapter shown in  FIGS. 3D and 3E . 
         FIG. 4A  is a top view of a portion of the slide arm and slide arm guides of an illustrative embodiment of the mitre tool. 
         FIG. 4B  is a side view of the slide arm guide assembly of an illustrative embodiment of the mitre tool. 
         FIG. 4C  is a side view of the slide arm guide assembly of an illustrative embodiment of the mitre tool. 
         FIG. 4D  is a plan view of the slide arm of an illustrative embodiment of the mitre tool. 
         FIG. 4E  is a side view of the slide arm of an illustrative embodiment of the mitre tool. 
         FIG. 4F  is a top view of a portion of the slide arm and slide arm guides of another illustrative embodiment of the mitre tool. 
         FIG. 4G  is a side view of the slide arm guide of another illustrative embodiment of the mitre tool. 
         FIG. 4H  is a side view of the slide arm guide of an illustrative embodiment of the mitre tool. 
         FIG. 4I  is a plan view of the slide arm of another illustrative embodiment of the mitre tool. 
         FIG. 5A  shows top plan view of the pivotable arms of the mitre tool. 
         FIG. 5B  shows end views of the pivotable arms  20  and  25  of the mitre tool. 
         FIG. 5C  shows top plan view of the pivotable arms of the mitre tool. 
         FIG. 5D  shows side view of the pivotable arms of the mitre tool. 
         FIG. 6  is a plan view showing the position of an illustrative embodiment of the mitre tool engaged with an inside wall corner. 
         FIG. 6A  is a plan view showing the position of another illustrative embodiment of the mitre tool engaged with an inside wall corner. 
         FIG. 6B  is a plan view showing the position of the illustrative embodiment  FIG. 1F  of the mitre tool engaged with an inside wall corner. 
         FIG. 7  is a plan view showing the position of an illustrative embodiment of the mitre tool engaged with an outside wall corner. 
         FIG. 7A  is a plan view showing the position of another illustrative embodiment of the mitre tool engaged with an outside wall corner. 
         FIG. 7B  is a plan view showing the position of the illustrative embodiment of  FIG. 1F  of the mitre tool engaged with an outside wall corner. 
         FIG. 8A  is a perspective view of an illustrative embodiment of the mitre tool with space adapter attached positioned on a saw deck for cutting right hand outside corner mitres. 
         FIG. 8B  is a perspective view of an illustrative embodiment of the mitre tool with space adapter attached positioned on a saw deck for cutting left hand outside corner mitres. 
         FIG. 8C  is a perspective view of another illustrative embodiment of the mitre tool with space adapter attached positioned on a saw deck for cutting right hand outside corner mitres. 
         FIG. 8D  is a perspective view of another illustrative embodiment of the mitre tool with space adapter attached positioned on a saw deck for cutting left hand outside corner mitres. 
         FIG. 8E  is a perspective view of the illustrative embodiment of  FIG. 1F  of the mitre tool with space adapter attached positioned on a saw deck for cutting right hand outside corner mitres. 
         FIG. 8F  is a perspective view of the illustrative embodiment of  FIG. 1F  of the mitre tool with space adapter attached positioned on a saw deck for cutting left hand outside corner mitres. 
         FIG. 8G  is a perspective view of the illustrative embodiment of  FIG. 1F  in an inverted position on a saw deck for cutting right hand inside corner mitres. 
         FIGS. 9-12  show examples of certain mitre table saw apparatuses for use with the mitre tool. 
         FIG. 13  shows a prior art method for determining the proper mitre cut angles. 
     
    
    
     DETAILED DESCRIPTION 
     Provided is a useful tool to achieve accurate mitre cuts of baseboard moldings, chair rail moldings, wood or plaster cornice moldings for either inside or outside corner shapes of any given construction. The use of the tool and method to determine mitre cuts would greatly reduce cost of scrap material and lost labor resulting from multiple inaccurate cuts. This mitre tool can accomplish an accurate mitre cut for most acute and obtuse corner shapes and does not require measurement in degrees of the corner shape mitre to be cut. 
     The mitre tool and associated space adapter are mechanical tools that do not require any electronics to determine inside and outside wall corner shapes and to properly set the saw blade of a mitre saw to make an accurate and precise mitre cut. 
     The mitre tool broadly comprises a plurality of pivotably connected arms, at least one base member attached to at least one arm of said plurality of arms, and an elongated member slidably engaged with at least two said base members. The mitre tool includes at least locking mechanisms for releasably locking the arms in a desired position. When the pivoting arms of the tool are locked into position, the elongated slide arm bisects the corner shape formed by surfaces of certain of the arms. When the mitre tool is adjusted to fit the wall corner shape, the slide arm is held in a north-south position by the slide arm guides at pivot points. Thus, the mitre tool can accurately determine the shape of wall corner shapes based on a well known geometric principle in bisection of any angle without knowing the angle in degrees using a mechanical measuring device, such as a compass. 
     The mitre tool can determine the bisection of any corner shape. This bisection, indicated by the slide arm member is the cut line that is transferred to the mitre saw deck and aligned with the saw blade plane. The mitre tool can mirror all wall corner shapes and indicate the mitre cut line automatically for most corner shapes in any residential or commercial construction. 
     According to certain illustrative embodiments, the plurality of pivotably connected arms comprises a first set and a second set of pivotably attached arms. Without limitation, the first set of arms is pivotably engaged with a first base member and the second set of arms is pivotably engaged with a second base member. The first set of arms and the second sets of arms are also pivotably attached to each other. The slide arm is slidably engaged with the first and second base members. 
     According to illustrative embodiments, the mitre tool comprises a first set of pivotably connected arms, wherein the first set of arms are curved alongtheir respective longitudinal axis, a second set of pivotably connected arms, wherein the arms of the second set of arms is substantially straight along at least a portion of their lengths, and at least one tightening member engaged with the at least one of the sets of first or second pivotably connected arms. 
     According to certain embodiments, the arms of the first set of arms are substantially planar. These arms may comprise a number of non-limiting cross sectional shapes that will permit pivoting of the arms at the pivot point(s) to effect the expansion and contraction function of the tool. 
     The arms of the second set of arms may comprise a planar portion and a bend portion. The bend portion of the arms of the second set of arms may comprise a substantially 90 degree bend along at least a portion of the longitudinal axis of said arms. 
     According to certain illustrative embodiments, first ends of each of the arms of the first set of arms are pivotably engaged with a first base member and the second ends of each of the arms of the first set of arms are pivotably engaged to one of the arms of the second set of arms. The first ends of each of the arms of the second set of arms are pivotably engaged with a second base member and each of the arms of the second set of arms are pivotably engaged to one of the arms of the first set of arms. According certain embodiments, the mid-portion between opposite ends of each of the arms of the second set of arms is pivotably engaged to an end of one of the arms of the first set of arms. 
     According to certain embodiments, the first set of arms comprises two arms. According to other embodiments, the second set of arms comprises two arms. However, many embodiments of the tool include both the first set of arms and the second set of arms each comprises two arms. 
     At least one of the first and second base members of the tool are translatable along at least a portion of the longitudinal axis of the elongated member. According to certain embodiments, both of the first and second base members are translatable along at least a portion of the length of the elongated member. 
     According to certain illustrative embodiments, elongated slide arm of the tool may include at least one horizontal flange portion and a upstanding fin portion. The upstanding fin portion comprises a cut line guide for the saw blade of any table saw. The slide arm is engaged with the slide arm guide assemblies. The slide arm is engaged to the slide arm guide assemblies in a manner such that the slide arm is free to translate between these components. The slide arm may further include a stop for retaining the horizontal flange portion of the slide arm between slide arm guides of the base member assemblies. 
     According to further illustrative embodiments, the elongated slide arm of the mitre tool may comprise an elongated and substantially planar bar. The elongated and substantially planar bar further includes a slot extending substantially along the entire longitudinal axis of the elongated bar. The longitudinally extending slot communicates though the entire thickness of the elongated and substantially planar slide arm. The elongated and slotted slide arm is not fixedly attached to any of the other pivotable arms of the mitre tool. Consequently, the elongated and slotted arm can slide in the direction of its longitudinal axis to points beyond the pivot point at which the ends of the first set of pivotably attached arms are pivotably attached to one another, and the pivot point at which the ends of the second set of pivotably attached arms are attached to one another. 
     The mitre tool includes two locking mechanisms for releasably locking the first set of arms and second set of arms in a desired position. As described above, the slide arm bisects the angle formed by surfaces of the arms of the second set of arms when the first set of arms and the second set of arms are locked in the desired position. 
     According to the embodiments of the mitre tool that include the elongated and slotted slide arm, the first set of arms and the second set of arms are locked into a desired position by lockable guide members that are engaged with the slotted slide arm and the ends of the first set of pivotably attached arms. A first lockable guide member is engaged with the elongated and slotted slide arm and the first set of arms. Likewise, a second lockable guide member is engaged with the elongated and slotted slide arm and the second set of arms. According to this construction of the mitre tool, the connections between the first set of arms and the second set of arms do not require additional locking mechanisms to maintain the arms of the mitre tool in the desired position for bisecting an angle. The first set of arms and the second set of arms may be connected by rivets, pins, rods, dowels, shafts and the like which permit free rotation of the arms. However, if desired, alternative embodiments of the mitre tool may include further locking mechanisms for attached the first set of arms to the second set of arms to one another. 
     Without limitation, the lockable guide members may comprise a threaded bolt or stud in combination with an internally threaded cylinder, such as an internally threaded sleeve nut. A washer, such as a polymeric washer may surround a portion of the external diameter of the sleeve nut. Without limitation, and only by way of illustration, the polymeric washer may comprise a nylon washer. The internally threaded cylinder is passed through bore holes formed in the arms of the mitre tool. The threaded bolt or stud is threaded into the cylinder to secure the arms of the mitre tool in proper position for bisecting any angle. 
     According to other illustrative embodiments, a first tightening member is engaged with the first ends of the arms of the first set of pivotably connected arms and a second tightening member is engaged with the second ends of the second set of pivotably connected arms. The first and second tightening members comprise a substantially cone-shaped lockable knob. Without limitation, the diameter of the base of the cone-shaped knobs is about ¾ of an inch. A threaded stud extends from the base of the cone-shaped tightening knob. The knob is engaged to the arms of the mitre tool by passing the stud through apertures on the arms of the tool and threading the stud through an internally threaded nut. 
     The mitre tool may be used to indicate outside wall corner shapes for cutting with a cutting machine. In order to accurately cut outside corner shapes, a space adapter must be engaged with the mitre tool. The space adapter includes a plurality of pivotably connected spacer arms. Without limitation, the space adapter comprises first and second sets of pivotably connected space adapter arms. Each of first and second sets of pivotably connected space adapter arms may comprise two arms. For embodiments where the space adapter includes two sets of arms, the first ends of the first set of space adapter arms are attached to a first space adapter arm of the second set of space adapter arms and the second ends of the first set of space adapter arms are attached to a second space adapter arm of the second set of space adapter arms. One arm of the second set of pivotably engaged arms is releasably connected to an arm of the space adapter. 
     In certain embodiments, the mitre tool is comprised of four arms or linkages that form two unique triangle shapes that are joined at the common base of each triangle with a slide arm member that is commonly engaged to both triangles. There are four pivot points, all bolted at two points along the east-west line with suitable mechanical fasteners. Two pivot points on the north-south line in the horizontal plane have slide arm guide assemblies also bolted at or near each of the two pivot point. These two slide arm guides are used to guide and hold the slide arm which functions as the cut line indicator of all corner shape mitres. 
     The method of using the mitre tool utilizes a geometric principle for bisecting any acute or obtuse corner wall shapes without requiring measurement devices to obtain the specific angles in degrees. The mitre tool eliminates the requirement to calculate angles for cutting mitre joints. By using the mitre tool, there is no need ever to determine the angle in degrees. 
     The mitre tool may be manufactured from metals, metal alloys, plastics, composite materials, or wood. According to certain embodiments, the mitre tool maybe manufactured from a rigid plastic material. The use of a plastic material is of a benefit being lightweight and less expensive to manufacture and ship. 
     The mitre tool is placed into or around a wall corner and the arms of the tool are made to come into contact with the wall surfaces comprising the corner. To obtain the shape of the corner, the arms of the tool are locked into position at pivot points  31  and  32 . When the mitre tool is secured in this position, it can then be used to scribe the miter angle onto the material to be cut, onto a work surface, or be used as a guide to set the cutting position of the saw blade of a mitre saw. 
     The mitre tool may be used the mitre cut for most wall corner shapes. The mitre tool may also be used to determine mitre cuts for in cabinet and furniture trim moldings. The mitre tool can be used indicate mitre cuts for cutting plaster cornice moldings as well as wood and composite molding materials. 
     According to certain illustrative embodiments, the mitre tool comprises a slide arm that includes a stop for retaining the slide arm in position between spaced-apart slide arm guides. 
     According to other illustrative embodiments, the mitre tool comprises a slide arm that is held and directed by two slide arm guides. The slide arm guides guide the slide arm, without angular deviation, in bisecting the corner shape determined by the mitre tool. 
     The mitre tool will now be further described in connection with certain illustrative embodiments depicted in the drawing Figures. It should be noted that the mitre tool should not be limited to the illustrative embodiments depicted by the Figures. 
     As shown in  FIGS. 1A-1C ,  2 A- 2 C,  4 A- 4 E,  5 A- 5 D,  6  and  7 , the mitre tool  10  comprises an elongated slide arm  15 , four elongated pivotable arms  20 ,  25 ,  30 , and  35 , two slide arm guide assemblies  6 ,  7  and two bases  18 . The slide arm guides are shown as an assembly of angled guide portions that are attached to a base member. However, it should be noted that the slide arm guide assembly may be provided as a single piece, such as a single piece of molded plastic. The slide arms, pivotable arms, and slide arm guides may be manufactured from metals, metal alloys, plastic, wood, or composite materials of a rigid plastic, steel or wood materials. 
     Arm  20  includes opposite first  41  and second  21  ends. Likewise, arm  25  includes opposite first  43  and second  22  ends. The second ends  21  and  22  of arms  20  and  25  are pivotably secured to one another and the underside of base  18  by a mechanical fastener. Without limitation, mechanical fasteners may include a bolt, screw, hinge, rivet, tack, or dowel. The arms  20  and  25  comprise vertical portions  40  and  42  that are joined to the horizontal portions  44  and  46  of the arms  20  and  25  at substantially right angles. The vertical portions  40  and  42  include outer abutment surfaces  47  and  48  for contacting the surfaces of wall corners as shown in  FIGS. 6 and 7  and for contacting the vertical fence  100  of a table saw  110  as shown in  FIGS. 2A-2C . 
     The vertical portions  40  and  42  of arms  20  and  25  also include inner abutment surfaces  96  and  97  for contacting the abutment surface  94  of the separately attached mitre tool space adapter  50  as shown in  FIG. 3A . The vertical portions  40  and  42  comprise apertures, such as holes  51 ,  52  and  53 ,  54 , respectively, that provide for removably securing the mitre tool  10  to the space adapter  50 . 
     As shown in  FIGS. 1A and 1C , the proximal portions  23  and  24  of arms  30  and  35  are pivotably secured to one another and the underside of base  18  by a mechanical fastener  33 . The mechanical fasteners used to secure arms  30  and  35  to base  18  may be the same as the fasteners used to secure arms  20  and  25  to base  18 . The distal portions  26  and  27  of arms  30  and  35  are pivotably secured to arms  20  and  25  by fasteners  31  and  32  at pivot points  28  and  29 . The mechanical fasteners used to secure arms  30  and  35  to arms  20  and  25  may be the same as the fasteners used to secure arms  20 ,  25  and  30 ,  35  to bases  18 . According to the illustrative embodiment shown in  FIGS. 1A and 1C , the mechanical fastener used comprises an assembly of a bolt, washer and wing nut. 
       FIG. 1D  shows a top plan view of another illustrative embodiment of the mitre tool  10  having an elongated and slotted slide arm  180 . Elongated slide arm  180  includes an elongated slot  182 . Elongated slot  182  extends substantially along the entire longitudinal axis of elongated arm  180 . That is, the slot  182  extends along almost the entire length of the elongated slide arm  180 . In the embodiment shown in  FIG. 1D , the elongated slot  182  of the slide arm  180  extends through the entire thickness of the arm  180 . Four elongated pivotable arms  184 ,  186 ,  188 , and  190 , and two lockable slide arm guides  200 ,  210  are also depicted in  FIG. 1D . 
     Still referring to  FIG. 1D , arm  184  includes opposite first  185  and second  187  ends. Likewise, arm  186  includes opposite first  189  and second  191  ends. The second ends  187  and  191  of arms  184  and  186  are pivotably secured to one another and the underside of slide arm  180  with a lockable slide guide  200  at pivot point  201 . Arm  188  includes opposite first  193  and second  195  ends. Likewise, arm  190  includes opposite first  197  and second  199  ends. The ends  193  of arm  188  and end  197  of arm  190  are pivotably secured to one another and the underside of arm  180  by a second lockable guide member  210  at pivot point  202 . 
     As shown in  FIG. 1E , without limitation, the lockable guides  200 ,  210  may comprise a threaded stud  212  with a knob  214  attached to one end of the threaded stud  212 . The threaded stud  212  is threaded into a sleeve nut  216 . A washer  218  is positioned between a surface of the slide arm  180  and a surface of pivotable arm  190 . The washer  218  is positioned in a manner to surround a portion of the sleeve nut  216 . While  FIG. 1E  depicts an embodiment of the locking slide guides  200 ,  210  of the mitre tool  10  using a threaded stud and sleeve nut, it should be noted that any suitable locking mechanism may be employed so long as the locking mechanism can work in conjunction with the slotted slide arm  180  to provide guidance for the slidable arm  180  and is able to lock the arms  184 ,  186 ,  188 ,  190  of the mitre tool  10  in a desired position when bisecting an angle. 
       FIG. 1F  shows a top plan view of another illustrative embodiment of the mitre tool  10 . Mitre tool  10  includes four pivotable arms  300 ,  302 ,  304 , and  306 . Arm  300  includes opposite first  308  and second  310  ends. Likewise, arm  302  includes opposite first  312  and second  314  ends. First ends  308  and  312  of arms  300  and  302  are pivotably secured to one another with the tightening member  316  at pivot point  318 . 
     Still referring to  FIG. 1F , arm  304  includes opposite first  320  and second  322  ends. Likewise, arm  306  includes opposite first  324  and second  326  ends. The end  322  of arm  304  and end  326  of arm  306  are pivotably secured to one another by a second tightening member  328  at pivot point  330 . End  310  of arm  300  is pivotably connected to arm  304  at pivot point  332 . End  314  of arm  302  is pivotably connected to arm  306  at pivot point  334 . 
     As shown in  FIG. 1G , without limitation, the tightening members  316 ,  328  may comprise a threaded stud  350  with a knob  352  attached to one end of the threaded stud  350 . The threaded stud  350  is threaded into a sleeve nut  354 . While  FIG. 1G  depicts an embodiment of the tightening members  316 ,  328  of the mitre tool  10  using a threaded stud and sleeve nut, it should be noted that any suitable tightening mechanism may be employed so long as the tightening mechanism is able to tighten the arms  300 ,  302 ,  304 ,  306  of the mitre tool  10  in a desired position. The knob  352  of the tightening members  316 ,  328  is provided with a substantially conical shape. Once the desired angle to be cut is determined and the tightening members  316 ,  328  lock the arms  300 ,  302 ,  304 ,  306  into position, then the mitre tool  10  is inverted and placed on the saw deck. The cone-shaped knobs  352  of the tightening members  316 ,  328  are positioned within slot located on the mitre saw deck to ensure that the proper angles are cut. The cone-shaped knobs  352  are provided specifically to accommodate a wide variety of slot widths on various mitre saw deck. 
     As shown in  FIGS. 4A-4C , according to certain embodiments, the two slide arm guide  6 ,  7  are mounted to the bases  18 . In the illustrative embodiment, guides  6 ,  7  are secured to the bases  18  by mechanical fasteners. For example, one pair of fasteners  12 ,  13  may be used to secure the slide arm guides  6 ,  7  to the bases  18 . The elongated slide arm  15  engages two pairs of slide arm guides  6 ,  7  in a slidable engagement. The slide arm  15  includes a pair of stops  2  and  4 . It should be noted that the slide arm  15  may be provided as separate pieces that are attached to one another or may be provided as a single integral tee piece. According to  FIGS. 4A-4C , the slide arm guides are shown as an assembly of angled guide portions that are attached to a base member. As shown in  FIGS. 4F-4H , it should be noted that the slide arm guides may be provided as a single piece, such as a single piece of molded plastic. 
     As shown in  FIGS. 4F-4H , the slide guide  220  includes a single internal piece, such as an integrally molded piece. Slide arm guide  220  may include a base portion  222  with a tab portion  224 . Base portion  222  further includes tab portions  226 ,  228  on an upper portion of the base portion  222 . Tabs  226 ,  228  define channels  230 ,  232  for accepting the horizontal flange portion and upstanding fin portion of one embodiment of the elongated slide arm of  FIGS. 4D and 4E . 
       FIG. 4I  depicts an illustrative embodiment of the slotted slide arm  180 . Slide arm  180  includes opposite first  181  and second  183  ends. Opposite ends  181 ,  183  may be rounded or otherwise tapered. Slide arm  180  includes an elongated slot  182  that extends along at least a portion of the longitudinal axis of the arm  180 . In the embodiment shown in  FIG. 4I , elongated slot  182  extends substantially along the entire longitudinal axis of slidable arm  180 . communicates 
     As shown in  FIGS. 3A ,  3 B and  3 C, the mitre tool space adapter  50  comprises two spaced-apart elongated arms  55  and  60 . Two further elongated arms  65  and  70  extend between and connect bars  55  and  60 . As shown in  FIG. 3B , the arm  55  comprises a vertical portion  87  joined to the horizontal portion  88  of the arm  55  at a substantially right angle. The vertical portion  87  includes an abutment surface  89  for contacting the vertical fence  100  of a table saw  110  as shown in  FIGS. 10 and 11 . 
     As shown in  FIG. 3C , the arm  60  comprises a vertical portion  90  joined to the horizontal portion  92  of the arm  60  at a substantially right angle. The vertical portion  90  includes an abutment surface  94  for contacting the abutment surfaces  47  and  48  of the mitre tool  10 . The vertical portion  90  provides for removably securing the space adapter  50  to the mitre tool  10  when setting the mitre saw blade in the same plane as the slide arm plane for outside corners. 
     The proximal portions  66  and  71  of bars  65  and  70  are pivotably secured to the ends  61  and  62  of arm  60  by suitable mechanical fasteners  63  and  64 . The distal portions  67  and  72  of arms  65  and  70  are pivotably secured to the mid-portions  56  and  57  of arm  55  by fasteners  73  and  74 . 
     As shown in  FIG. 3C , the arm  60  is provided with a pair of notches  84  and  86  to provide clearance for  31  and  32  respectively when the space adapter  50  is attached to either arm  20  or  25 . The arm  60  is further provided with a pair of fasteners  80  and  82  for firmly securing the arm  60  to arms  20  and  25  to allow the mitre tool  10  to be positioned against a fence  100  of a table saw  110 . 
     Another illustrative embodiment of the space adapter is shown in  FIGS. 3D-3F . Referring to  FIGS. 3D-3F , space adapter  240  comprises elongated arm  242  that is spaced-apart from a staggered set of two elongated arms  244 ,  246 . Two further elongated arms  248  and  250  extend between and connect arms  242 ,  244 ,  246 . As shown in  FIGS. 3D and 3E , the arm  242  comprises a vertical portion  243  joined to the horizontal portion  245  of the arm  242  at a substantially right angle. The vertical portion  243  includes an abutment surface for contacting the vertical fence of a table saw. 
     In use, the mitre tool  10  is placed into or around a corner as shown in  FIGS. 6 and 7  respectively and the abutment surfaces  47  and  48  of the arms  20  and  25  are made to contact the surfaces comprising the corner in order to determine the mitre or bisecting angle. As shown in  FIGS. 1A ,  1 B,  6  and  7 , the tool  10  is capable of manipulation such that pivotably rotatable movement around fasteners  31 ,  32  allows arms  20  and  25  to move toward or away from the elongated slide arm  15  (i.e., the wall corner shapes  140  and  150  decreases or increases respectively) when determining inside and outside corner shapes (whether the corners have acute or obtuse angles), while at the same time allows the slide arm  15  to remain in a north-south position bisecting the corner shape moving through two slide arm guides  6 ,  7  with which it is engaged. Similarly as shown in  FIGS. 1A ,  1 B,  1 C,  6  and  7 , manipulation of the tool  10  results in arms  30  and  35  to move toward or away from the elongated slide arm  15  (i.e., the wall corner shape  160  decreases or increases respectively) when determining inside and outside corner shapes (whether the corners have acute or obtuse angles), while at the same time allows the slide arm  15  to move through two slide arm guides  6 ,  7  with which it is engaged. 
     The arms  20  and  25  are made to come into contact with the walls of a corner. Once the abutment surfaces  40  and  42  of arms  20  and  25  are brought into contact with walls, then fasteners  31  and  32  located at the east-west pivots are tightened to set and lock the arms  20 ,  25 ,  30  and  35  in position. 
     The mitre tool  10  is then removed from the corner and placed onto the saw deck of a suitable saw, such as an adjustable circular mitre saw as shown in  FIGS. 10 and 11  or a manually adjusted mitre saw as shown in  FIGS. 9 and 12 . The mitre tool  10  is positioned on the saw deck  105  with either one of the outer abutment surfaces  47  and  48  of arms  20  and  25  respectively contacting the mitre saw vertical fence guide  100  for inside corners or abutment surface  89  of the space adapter  50  contacting the mitre saw vertical fence guide  100 . Subsequently, the mitre saw blade is rotated to a position such that the blade and slide arm  15  are aligned in the same plane. Once the saw blade is moved into proper cutting position, then the tool  10  is removed from the saw deck. After the mitre tool  10  is removed, the molding to be cut is positioned against the vertical fence  100  for either right or left hand cuts and the molding is cut with the saw blade. 
     To specifically create a mitre joint at an inside corner  130  as shown in  FIG. 6 , the user first ensures that the tool  10  is in a position such that stop  2  of the one end of slide arm  15  is in contact with slide arm guides  6  and  7  as shown in  FIGS. 4B and 4C . Stop  4  of the opposite end of slide arm  15  is located closer to, but not in contact with, slide arm guides  6 ,  7 . Next, the user positions the abutment surfaces  47  and  48  of tool  10  against the inside corner walls. The user locks both sets of arms  20  and  25 , and  30  and  35  by tightening the fasteners  31 ,  32 , thereby creating the requisite inside corner angle  140 . 
     Subsequent to determining and locking the desired inside corner wall shape  140 , the tool  10  is placed onto the deck  105  of a mitre saw  110 , whereby the abutment surfaces  47  and  48  of arms  20  and  25  respectively are separately placed against the vertical fence  100  as shown in  FIGS. 2A-2C . The mitre saw blade is then rotated to a position such that the blade and slide arm  15  ( FIGS. 2A-2C ) are aligned in the same plane. After the mitre tool  10  is removed, the molding to be cut is positioned against the vertical fence  100  for either right or left hand cuts. 
     According to  FIGS. 2D and 2E , subsequent to determining and locking the desired inside corner wall shape  140 , the tool  14  is placed onto the deck  105  of a mitre saw  110 , whereby the abutment surfaces arms  184  or  186  are separately placed against the vertical fence  100 . The mitre saw blade is then rotated to a position such that the blade and slide arm  180  are aligned in the same plane. After the mitre tool  14  is removed, the molding to be cut is positioned against the vertical fence  100  for either right or left hand cuts. 
     Turning to  FIGS. 2F and 2G , subsequent to determining and tightening the desired inside corner wall shape  140 , the tool is inverted with the cone-shaped knobs facing toward the mitre saw deck, then the tool  10  is placed onto the deck  105  of a mitre saw  110  with the cone-shaped knobs positioned at least partially within the saw deck slot. The abutment surfaces arms  304  or  306  of the mitre tool are separately placed against the vertical fence  100 . The mitre saw blade is then rotated to a position such that the blade of the mitre saw  110  is aligned in the same plane as the cone-shaped knob  352  of the tightening members  316 ,  328 , which are positioned within the saw deck slot. After the mitre tool  10  is removed, the molding to be cut is positioned against the vertical fence  100  for either right or left hand cuts. 
     To specifically create a mitre joint at an outside corner  120  as shown in  FIG. 7 , operation of the mitre tool  10  requires attachment of the space adapter  50 , which is shown in  FIGS. 3A-3C . As with measuring inside corner wall shapes, the user ensures that the tool  10  is in a position such that stop  2  of the one end of slide arm  15  is in contact with slide arm guide assemblies  6  and  7 . Stop  4  of the opposite end of slide arm  15  is located closer to, but not in contact with, slide arm guides  6 ,  7 . The user positions the abutment surfaces  47  and  48  of tool  10  against the outside corner walls. The user sets and locks both sets of arms  20  and  25 , and  30  and  35  by tightening the fasteners  31 ,  32  at the east-west pivot points, thereby creating the requisite outside corner shape  150 . 
     Subsequent to determining and locking the desired outside corner wall angle  150 , the slide arm  15  on the tool  10  is moved to a position such that stop  4  is in contact with slide arm guides  6 ,  7 . Then, the tool  10  is attached to the space adapter  50  prior to being placed onto the deck  105  of a mitre saw  110 . Accordingly, vertical portions  40  and  42  of arms  20  and  25  of the mitre tool  10  comprise two pairs of holes  51 - 52  and  53 - 54  respectively. Similarly, vertical portion  90  of bar  60  of the space adapter  50  comprises a pair of fasteners  80  and  82 . Therefore, mitre tool  10  can be mated with the space adapter  50  through the use of fasteners  80  and  82  that are in communication with holes  51 ,  52  and  53 ,  54  respectively resulting in contact between the inner abutment surfaces  96  and  97  of the mitre tool  10  and abutment surface  94  of the space adapter  50 . 
     After attachment of the space adapter  50  to the mitre tool  10 , the assembly is positioned onto the deck  105  of a mitre saw  110 , whereby the abutment surface  89  of the arm  55  of the space adapter  50  is placed against the vertical fence  100  of a table saw  110  (as shown in  FIGS. 8A and 8B ). Slide the combined mitre tool  10  and space adapter  50  along the east-west vertical fence until the saw blade and slide arm  15  are aligned in the same plane. The mitre tool  10  is then removed from the saw deck. After the mitre tool  10  is removed, the molding to be cut is positioned against the vertical fence  100  for either right or left hand cuts and the molding is cut with the saw blade. 
     To specifically create a mitre joint at an inside corner  130  as shown in  FIG. 6A  using the embodiment of the device incorporating a slotted slide arm, the user first positions the abutment surfaces of arms  184 ,  186  of the mitre tool  14  against the inside corner walls. The user then locks both the first set of arms  184  and  186  with lockable guide  200  at pivot point  201 , and second set of arms  188 ,  190  with lockable guide  210  a pivot point  202 , thereby creating the requisite inside corner angle  140 . 
     Subsequent to determining and locking the desired inside corner wall shape  140 , the tool  10  is placed onto the deck  105  of a mitre saw  110 , whereby the abutment surfaces of arms  184 ,  186  are separately placed against the vertical fence  100  as shown in  FIGS. 2D and 2E . The mitre saw blade is then rotated to a position such that the blade and slide arm  180  are aligned in the same plane. After the mitre tool  14  is removed, the molding to be cut is positioned against the vertical fence  100  for either right or left hand cuts. 
     To specifically create a mitre joint at an inside corner  130  as shown in  FIG. 6B , the user first positions the abutment surfaces of arms  304 ,  306  of the mitre tool  10  against the inside corner wall. The user then tightens both the second set of arms  304 ,  306  with tightening member  328  at pivot point  330 , and first set of arms  300 ,  302  with tightening member  316  a pivot point  318 , thereby creating the requisite inside corner angle  140 . 
     To create an inside corner mitre cut, the cone-shaped locking members are loosened to permit pivoting of the arms of the tool. The arms of the mitre tool are positioned against each corner wall and the tightening members are tightened. The mitre tool is then removed from the wall. The mitre tool is inverted to position the cone-shaped knobs in a face-down position. The mitre tool is placed on the saw deck of the mitre saw with the cone-shaped knobs being inserted at least partially into the saw deck blade slot. The user then loosens the mitre saw deck locking mechanism and, while holding the mitre tool against the saw deck slot with one hand, rotates the saw deck right or left until the mitre tool arm rests against the vertical fence of the saw deck. The saw deck is locked into position with the saw deck locking mechanism and the mitre tool is removed from the saw deck. The molding to be cut is placed on the same side as the mitre tool placement (right or left) and the molding is cut. 
     Subsequent to determining and locking the desired inside corner wall shape  140 , the tool  10  is inverted and placed onto the deck  105  of a mitre saw  110 , whereby the abutment surfaces of arms are separately placed against the vertical fence  100  as shown in  FIGS. 2F and 2G . By inverting the tool, the cone-shaped knobs  352  of the tightening members  316 ,  318  are inserted into the slot of the mitre saw deck  105 . The mitre saw blade is then rotated to a position such that the blade and the tightening members  316 ,  328  are aligned in the same plane. After the mitre tool  10  is removed, the molding to be cut is positioned against the vertical fence  100  for either right or left hand cuts. 
     To specifically create a mitre joint at an outside corner  120  as shown in  FIG. 7A  using the embodiment of the device incorporating a slotted slide arm, operation of the mitre tool  14  requires attachment of the space adapter  50 ,  240 , which is shown in  FIGS. 3A-3F . The user first positions the abutment surfaces of arms  184 ,  186  of the mitre tool  14  against the inside corner walls. The user then tightens both the first set of arms  184  and  186  with tightening member  200  at pivot point  201 , and second set of arms  188 ,  190  with tightening member  210  a pivot point  202 , thereby creating the requisite outside corner shape  150 . 
     Subsequent to determining and locking the desired outside corner wall angle  150  and prior to being placed onto the deck  105  of a mitre saw  110 , the mitre tool  14  is attached to the space adapter  50 ,  240 . After attachment of the space adapter  50 ,  240  to the mitre tool  14 , the assembly is positioned onto the deck  105  of a mitre saw  110 , whereby the abutment surface of the arm  55  of the space adapter  50 ,  240  is placed against the vertical fence  100  of a table saw  110  (as shown in  FIGS. 8C and 8D ). Slide the combined mitre tool  14  and space adapter  50 ,  240  along the east-west vertical fence until the saw blade and slide arm  180  are aligned in the same plane. The mitre tool  14  is then removed from the saw deck. After the mitre tool  14  is removed, the molding to be cut is positioned against the vertical fence  100  for either right or left hand cuts and the molding is cut with the saw blade. 
     To specifically create a mitre joint at an outside corner  120  as shown in  FIG. 7B , operation of the mitre tool  10  requires attachment of the space adapter  50 ,  240 , which is shown in  FIGS. 3A-3F . The user first positions the abutment surfaces of arms  304 ,  306  of the mitre tool  10  against the inside corner walls. The user then locks both the first set of arms  300 ,  302  with lockable guide  316  at pivot point  330 , and second set of arms  304 ,  306  with lockable guide  328  a pivot point  334 , thereby creating the requisite outside corner shape  150 . 
     To create an outside corner mitre cut, the cone-shaped tightening members are loosened to permit pivoting of the arms of the tool. The arms of the mitre tool are positioned against each corner wall and the tightening members are tightened. The mitre tool is then removed from the wall. The mitre tool is inverted to position the cone-shaped knobs in a face-down position. The mitre tool is placed on the saw deck of the mitre saw with the cone-shaped knobs being inserted at least partially into the saw deck blade slot. The double angled arm of the space adapter is engaged with the vertical flange of the arms (right or left) of the mitre tool. The width of the space adapter is adjusted to approximate the alignment with the mitre tool fulcrum. The user then loosens the mitre saw deck locking mechanism and, while holding the mitre tool against the saw deck slot with one hand, rotates the saw deck right or left until the mitre tool arm rests against the vertical fence of the saw deck. If the space adapter was placed on the right side vertical flange of the mitre tool, then the user loosens and rotates the mitre saw deck to the right vertical fence on the saw deck until the space adapter flanges is against the vertical fence of the saw deck. The saw deck is locked into position with the saw deck locking mechanism and the mitre tool is removed from the saw deck. The molding to be cut is placed on the opposite side as the mitre tool placement (right or left) and the molding is cut. 
     Subsequent to determining and tightening the desired outside corner wall angle  150  and prior to being placed onto the deck  105  of a mitre saw  110 , the mitre tool  10  is inverted and attached to the space adapter  50 ,  240 . After attachment of the space adapter  50 ,  240  to the mitre tool  10 , the assembly is positioned onto the deck  105  of a mitre saw  110 . The space adapter is manipulated so that the abutment surface of the arm  55  of the space adapter  50 ,  240  is positioned against the vertical fence  100  of a table saw  110  (as shown in  FIGS. 8E and 8F ), and is aligned with the fulcrum of the mitre tool. The mitre tool  10  is then removed from the saw deck. After the mitre tool  10  is removed, the molding to be cut is positioned against the vertical fence  100  for either right or left hand cuts and the molding is cut with the saw blade. 
     When using the embodiment of the mitre tool shown in  FIG. 1F  to cut inside mitre cuts, the mitre saw deck slot is used to determine the mitre cut plane. The cone-shaped knobs of the tightening members are placed into the mitre saw deck slot, and the saw deck is rotated either left or right while holding the mitre tool down against the saw deck slot until one of the arms of the mitre tool rests against the vertical fence of the mitre saw. The mitre saw blade is now in position to cut the right or left moldings, depending on which side of the mitre saw deck the mitre tool was placed. The mitre tool is then removed from the saw deck, the molding to be cut is placed onto the saw deck against the vertical fence, and the molding is cut. Using the same mitre tool setting, place the cone-shaped tightening member knobs into the saw deck slot and while holding the mitre tool against the saw deck, rotate the saw deck to the opposite side of the previous cut made and lock the deck into position. The mitre tool is removed, the molding to be cut in place against the vertical fence of the saw deck, and the molding is cut. When using the embodiment of the mitre tool shown in  FIG. 1F  to cut outside mitre cuts, the user must attach the space adapter to the mitre tool to properly position the mitre tool against the vertical fence of the mitre saw deck. 
     While the tool and method have been described above in connection with the certain illustrative embodiments, as shown in the drawing Figures, it is to be understood that other similar embodiments may be used or modifications and additions may be made to the described embodiments for performing the same function of the tool without deviating therefrom. Further, all embodiments disclosed are not necessarily in the alternative, as various embodiments may be combined to provide the desired characteristics. Variations can be made by one having ordinary skill in the art without departing from the spirit and scope of the disclosure.