Abstract:
The instant invention is directed to method and apparatus for securing an implement to a transporter. The transporter has rigid hooks affixed thereto adjacent the platforms upon which the wheels of the implement rest during transport. The implement has horizontally protruding cross pins that rise as the header on the implement is lowered to the transport position. By directing the wheels of the implement onto the transporter, the cross pins are moved into the mouths of the hooks and then, upon lowering of the implement header, the pins are directed into the throats of the hooks, securing the implement to the transporter.

Description:
FIELD OF THE INVENTION  
         [0001]    The instant invention relates generally to transporters for crop harvesting implements, and more particularly to method and apparatus for securing an implement to such a transporter.  
         BACKGROUND OF THE INVENTION  
         [0002]    Generally, harvesting equipment, particularly hay harvesting equipment, has been designed and manufactured with a transverse width that would permit transport thereof over the highway and through farm gates. Although the hay harvesting machines commonly referred to as pivot tongue windrowers, such as those shown in U.S. Pat. No. 4,081,946, granted in 1978 to Philip J. Ehrhart, were generally wider in a transverse direction than previous pull-type hay harvesting machines, the centrally mounted pivoted drawbar permitted towing of the harvester directly behind the tractor in a centrally located position and, therefore, transport of the harvester in a normal operational orientation was possible.  
           [0003]    Increasing transverse widths of such harvesting machines, however, prevents harvesters from being towed over the highway and through restrictive openings behind the tractor in a normal orientation, necessitating the provision of alternative means of transport. Two methods of transporting such implements in a transverse orientation are shown in U.S. Pat. Nos. 3,962,853 and 3,721,461. Such apparatus requires a movement of wheels, hitches, jacks, etc. to equip the harvester for movement in a transverse direction, including the disconnection and reconnection of appropriate hitches to the tractor.  
           [0004]    The development of the pivot tongue harvester with a laterally extendible drawbar, as disclosed in U.S. Pat. No. 4,558,560, permits the harvester to be mounted on a transporter and transported in a lateral orientation by utilizing the drawbar of the harvester as the hitch connection to the tractor. Such a transporter utilizes transversely extending load ramps to permit the harvester to be elevated from the ground onto the transporter. For example, U.S. Pat. No. 4,607,996, granted to Earl E. Koch in 1986, discloses a transporter developed for carrying an implement of the type including a pivot tongue arched over the crop cutterhead of the implement and pivoted at is rear end to a location midway between the opposing side ends of the wheel-supported frame from which the cutterhead, or header, is suspended. The transporter includes an over-the-center latch adjacent each platform to engage special brackets affixed to the harvester frame to secure the harvester to the transporter. This is a very functional and reliable system; however, it does employ parts and components that are relatively expensive and moderately complex.  
           [0005]    Another example of a transporter is U.S. Pat. No. 5,975,829, issued to Walters et al. in 1999. The transporter shown in the &#39;829 patent, while very similar to the Koch patent mentioned above, differs, inter alia, in the method by which the implement is secured to the transporter. In the &#39;829 patent, upwardly facing latch hooks are affixed to the rear of the implement and, after loading onto the transporter, rise into engagement with bumper/latch bars on the transporter as the header is lowered for transport. This system is not quite so complex as the earlier machine, but does require specially bent and formed parts that require more skill and labor to manufacture than those required by the instant invention.  
           [0006]    It would be desirable and beneficial to provide an apparatus for securing the implement to the transporter that is simpler to manufacturer and easier to assemble than those used in prior art machines.  
         SUMMARY OF THE INVENTION  
         [0007]    It is an object of this invention to provide an implement transporter that employs simple hooks affixed to the transporter and cross pins on the implement to securely fasten the implement to the transporter.  
           [0008]    It is another object of this invention to provide fixed hooks, open toward the ramps, and cross pins on the implement arranged so that the cross pins enter the mouths of the hooks and then fully engage the throats thereof when the header on the implement is lowered to the transport position.  
           [0009]    It is a broad object of this invention to provide an improved implement transporter of the type described herein that is reliable and stable in design and simple in construction.  
           [0010]    It is a further object of this invention to provide a method for securing an implement to a transporter, the steps of which are simple and easy to follow, and result in a reliable locking of the implement to the transporter time after time.  
           [0011]    It is a feature of this invention to provide a method and apparatus for securing an implement to a transporter that does not rely upon complex or expensive to produce components.  
           [0012]    It is a still further object of this invention to provide a lateral transporter for carrying a harvesting machine in a transverse orientation that is durable in construction, inexpensive of manufacture, low in maintenance, facile in assemblage, and simple and effective in use.  
           [0013]    These and other objects, features and advantages are accomplished according to the instant invention by providing a method and apparatus for securing an implement to a transporter. The transporter has rigid hooks affixed thereto adjacent the platforms upon which the wheels of the implement rest during transport. The implement has horizontally protruding cross pins that rise as the header on the implement is lowered to the transport position. By directing the wheels of the implement onto the transporter platforms, the cross pins are moved into the mouths of the hooks and then, upon lowering of the implement header, the pins are directed into the throats of the hooks, securing the implement to the transporter. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0014]    The advantages of this invention will become apparent upon consideration of the following detailed disclosure of the invention, especially when taken in conjunction with the accompanying drawings wherein:  
         [0015]    [0015]FIG. 1 is a top plan view of the crop harvesting implement of the type to be transported, showing the rear end of a tractor connected thereto, the operative tongue positions and the relative transport positions of the tractor and implement (without the transporter);  
         [0016]    [0016]FIG. 2 is a top plan view of the transporter of the instant invention and a tractor attached for empty towing of the transporter;  
         [0017]    [0017]FIG. 3 is a front elevation view of the transporter (relative to the normal empty towing direction) to a larger scale than FIG. 2 and taken on the line  3 - 3  of FIG. 2;  
         [0018]    [0018]FIG. 4 is a top plan view of the implement and tractor preparing to back the implement onto the transporter; the removable tongue of the transporter has been moved to its storage position adjacent the rearmost ramp;  
         [0019]    [0019]FIG. 5 is an enlarged front elevation view taken on the line  5 - 5  of FIG. 4 showing (in phantom) the implement approaching the ramps and after it has been moved off the ramps onto the platform, ready to raise the ramps;  
         [0020]    [0020]FIG. 6 is a front elevation view of the transporter, similar to FIG. 5, indicating how further backing motion of the implement after it has moved off the ramps onto the platform affects raising of the ramps from the solid line (ground-engaging) position to the final phantom line (transport) position;  
         [0021]    [0021]FIG. 7 is a fragmentary elevation view, similar to FIG. 6, but with parts broken away to better reveal the relationship of the disclosed cross pins of the implement with the securing hooks of the transporter frame (lift cylinder extended);  
         [0022]    [0022]FIG. 8 is a view, like FIG. 7, but with the implement lift cylinder retracted from the FIG. 7 position to cause the implement to lower onto the platform and elevate the cross pins into the throats of the securing hooks while lowering the implement header onto the support plates;  
         [0023]    [0023]FIG. 9 is a rear elevation view, like FIGS. 5 and 6, with the implement in the full transport position;  
         [0024]    [0024]FIG. 10 is a top plan view of the tractor, implement and transporter assembly in the loaded and secured mode of FIG. 9;  
         [0025]    [0025]FIGS. 11 and 12 are sequential plan views of the assembly of FIG. 10 showing the loaded transporter being oriented from loading position to towing position relative to the tractor by manipulation of the implement tongue pivoting cylinder;  
         [0026]    [0026]FIG. 13 is an enlarged plan view of the transporter alone in the mode illustrated in FIG. 12;  
         [0027]    [0027]FIG. 14 is an enlarged detail view taken on the line  14 - 14  of FIG. 13 showing the ramp and main frame structure in the area where the implement wheel moves from the ramp onto the platform;  
         [0028]    [0028]FIG. 15 is a fragmentary elevation view of the ramp latch mechanism taken on the line  15 - 15  of FIG. 13;  
         [0029]    [0029]FIG. 16 is a view of the structure of FIG. 15 taken at the right angle thereto as shown by the line  16 - 16  of FIG. 15;  
         [0030]    [0030]FIG. 17 is a view similar to FIG. 15, %With the selection arm thrown over to the locking position;  
         [0031]    [0031]FIG. 18 is a vertical elevation view taken on the line  18 - 18  of FIG. 13 showing the fold-up jack drawn to an enlarged scale;  
         [0032]    [0032]FIG. 19 is a vertical sectional view of the jack taken on the line  1919  of FIG. 18;  
         [0033]    [0033]FIG. 20 is a view similar to FIG. 19, but showing the jack parts in locked condition when the main frame is under downward loading; and  
         [0034]    [0034]FIG. 21 is a view similar to FIGS. 19 and 20 with the weight load removed from the main frame, as in FIG. 19, and the jack stand swung upwardly in response to forward transport of the implement and contact with the ground or any object on the ground. 
     
    
     DETAILED DESCRIPTION OF THE INVENTION  
       [0035]    Referring now to the drawings, and particularly FIG. 1, a pivot tongue mower-conditioner  10  suitable for use with the transporter of the instant invention is shown. As discussed above in the BACKGROUND OF THE INVENTION, this is a well-known hay harvester and includes, in pertinent part, a centrally mounted pivot tongue  12  connected to tractor  5 , a header  14  (see FIGS. 5 through 9) with a cutterbar  16 , conditioner rolls  18  and support wheels  20  and  22 . The mower-conditioner may be operated in any of the three positions shown in FIG. 1 as  1 ,  2  and  3 . For purposes of clarity, FIG. 1 also shows the tractor  5  in the lateral position  4 , which is the position it would be in for pulling the implement after loading onto the transporter.  
         [0036]    Since the drawbar, or tongue, of the implement is used to pull the load during the transport mode, some other arrangement has to be made for empty movement. FIG. 2 shows the transporter ready for movement without a loaded implement. For purposes of understanding, reference will be made herein to the “forward” and “rearward”, “front” and “rear” directions. Forward is the direction of travel of the transporter when loaded, which would be to the right in FIG. 2. Reverse is the opposite direction, or the direction that the transporter is moved when unloaded. A secondary tongue  26  attaches to a yoke  53  on the rearmost ramp  60  by pins or bolts  54  and  55 . Tongue  26  has a storage location on the transporter that can be seen in FIG. 4, where it is safely secured when not in use. Note that when moving the transporter without the implement, secondary tongue  26  is attached such that the direction of travel is the opposite of that when loaded.  
         [0037]    Referring again to FIG. 2, and to FIG. 13, the basic transporter  30  can be seen to comprise a main frame that includes a longitudinal box beam  32 , a shorter longitudinal box beam  34  held in spaced apart relation to beam  32  by two additional generally transverse box beams  36  and  38 . The main frame is supported for movement by wheel sets  40  and  42  (in both cases, only one reference number is used to designate the wheel pair), though single wheels would also provide the adequate support, however, perhaps without the desired load carrying capabilities, especially in wet, muddy field conditions often encountered on the farm. As can be seen more clearly in other figures, a caster wheel  44  is attached to beam  32  at the rear end thereof for additional support during loading and unloading and for assistance in moving the implement tongue  12  from the loading to the transport position. Caster wheel  44  is in common usage and standard construction and style.  
         [0038]    A pair of ramps,  60  and  61 , are pivotably attached to the main frame, as will be discussed in more detail further below. Attached to the transverse beams  36  and  38 , and extending above the level of the raised ramps, are two header supports. These supports are comprised of beams  46  and  47  and generally flat support plates  48  and  49 . When the header  14  of implement  10  is lowered for transport, as will also be discussed further below, the header rests on these support plates.  
         [0039]    Referring now to FIGS. 3 through 5,  13  and  14 , the operation of the ramps will be described. During the loading operation, the implement is pushed by the tractor up the ramps onto a platform, after which continued pushing by the tractor results in the ramps being raised from the loading position to the transport position. More specifically, a pair of independently movable ramps,  60  and  61 , pivot between a loading position where one end of the ramp is in contact with the ground and a transport position where the ramps are in a generally horizontal position. Perhaps as best seen in FIG. 13, ramps  60  and  61  are generally mirror images of each other (so a description of one is applicable to the other). They are each comprised of two lateral C-shaped channels,  62  and  64 , which are side members for a plurality of support members  66  that extend between the two side members part way along the length thereof, stopping at the support  66   a . Thereafter, the distance between the two side members is increased slightly when member  64  takes a jog inwardly. A cross bar  67  interconnects the upper ends of side members  62  and  64 . As can best be seen in FIG. 14, cross bar  67  is comprised of a rod  68  enclosed in loosely fitting tube  69 .  
         [0040]    Affixed to beam  32  are a pair of platform supports,  70  and  72 , that extend transversely from beam  32 . On the underside of each of these supports is a flange,  74  and  76 , that is pivotably pinned to a matching flange,  77  and  78 , on the side members  62  and  64  of the ramp. Thus, the ramps pivot vertically about pivot point  80  between the loading and transport positions.  
         [0041]    Extending between the platform supports  70  and  72  are platform braces  82  and  84  which, together with the top of beam  32  form a platform to support the wheels of the implement during transport. There is additionally provided a small wheel guide  86  that assures proper placement of the wheel during loading and unloading and additionally prevents the tires from rubbing against frame members, impeding pivoting of the ramps.  
         [0042]    Thus, in loading, the implement is put into the raised position (header up) and the tractor backs the implement wheels onto support member  66  of ramps  60  and  61 . When the tires pass over support member  66   a , they move off the ramps and onto the platform made up of platform braces  82  and  84  and beam  32 . As the tractor continues to push the implement onto the transporter, the tires come into contact with cross bar  67  where, as can perhaps best be seen in FIGS. 5 and 6, the rearward force causes the ramps to pivot upwardly and into the transport position because the cross bar is located above the pivot point  80  of the ramp. The tires contact the loose fitting tube  69  of cross bar  67  and may spin or rotate tube  69  as they force the ramp into the transport position. In this way, the tires do not grip the cross bar and resist the pivoting of the ramp.  
         [0043]    Referring to FIGS. 6 through 9, the locking of the implement to the transporter will be described. Looking at the phantom partial showing of the implement in FIG. 7, it can be seen that the header  14  is raised and lowered through the action of hydraulic cylinder  90 . Wheel  22  (and this is true of the other end of the implement also as both sides of the implement are similar in construction and operate off of a single hydraulic system) is attached at its axis  93  to implement frame  92  by a wheel arm  94 . With wheel arm  94  pivotally attached to frame  92  at pivot point  96 , cylinder  90  works to either raise or lower the frame, and thus the header, relative to the ground. Affixed to the wheel arm  94  is a latch  97  that includes at one end there of a cross pin  98  that extends between the two side plates of latch  97  on an axis parallel to that of the spindle of wheel  22 . There is rigidly affixed at each end of beam  32 , adjacent the platforms a hook  100  (most clearly seen in FIG. 14) that includes a mouth  102 , opening generally downwardly and toward the platform, and a throat  104 . The physical arrangement between cross bar  67 , hook  100 , cross pin  98  and wheel  22  is such that during the loading operation, the wheel  22  comes into contact with cross bar  67  at approximately the same time that cross pin  98  approaches the mouth of hook  100 . As the tractor forces the implement back against the cross bar  67 , the pin  98  enters the mouth of hook  100 . Then, cylinder  90  is contracted, lowering the header and raising cross pin  98  solidly into the throat of hook  100 , securing the implement on the transporter. At that same time, the wheels are pulled tightly against the cross bar, solidly holding the ramps in the transport position.  
         [0044]    [0044]FIGS. 13 through 17 show, inter alia, the locks for securing the ramps in the raised position when moving the empty transporter. There are separate and generally identical locks on each ramp, only one of which will be described. The lock has two basic positions that are manually set by the operator-an unlocked position where the ramp is free to move between the loading and transport positions, and the locking position where the ramp is either locked in the transport position or movable into the locked position.  
         [0045]    The lock itself is comprised of a latch  110  pivotally affixed to beam  32  by pin  112  that extends through latch  110 . Spacer  113  holds the latch and other mechanisms a small distance away from beam  32  to help prevent the build up of debris that could interfere with operation. An angular selection arm  114  extends through a hole in pin  112  and is pivotable approximately 180° relative to the plane of the latch. Pin  112  also serves as a fastener to hold the latch, pin, spacer, and selection arm structure together. A tension spring  116  is attached at to latch  110  at point  118  and to the selection arm at point  120 . Since the relative positions of attachment points  118 ,  120  and pin  112  (pivot point for latch  110 ) can be changed by pivoting selection arm  114  between the two positions shown in FIG. 17, the spring and selection arm are in reality an over-the-center mechanism that will bias latch  110  into the two positions-unlocked and locking. A stop  122 , in the form of an angled plate is affixed to the beam  32  to stop the latch at a selected maximum open position, as shown in FIG. 15, and a maximum closed position, as shown in FIG. 17.  
         [0046]    In FIG. 15, side member  64  of the ramp is shown solid in the transport position and the loading position in phantom. Latch  110  is shown in this figure to be in unlocked position, i.e., selection arm  114  is pivoted to the right and the over-the-center mechanism is biasing the latch into the unlocked position and in contact with stop  122 —the latch will not lock onto member  64 , so the ramp is free to move between the loading and transport positions. In FIG. 17 the selection arm  114  has been moved manually by the operator 180° from that shown in FIG. 15 and latch  110  is biased toward the locking position. The angled leg of stop  122  is in contact with latch  110 . As the ramp is raised, it locks under the latch  110  as shown in phantom in this figure.  
         [0047]    Latch  110  has a hook-shaped mouth  124  open toward the point at which member  64  contacts the top surface of beam  32 . The surface of latch  110  closest to the path of movement of member  64 , adjacent to mouth  124 , is an inclined surface  128  which, when contacted by member  64  as it moves toward the raised position (downwardly in this figure), will serve to push the latch clockwise, as viewed in FIG. 17, toward the unlocked position; however, since the over-the-center mechanism is biasing the latch to the locked position, the latch will merely move clockwise until member  64  clears the edge of mouth  124 , and then spring back to the locked position, securing the ramp in the transport position.  
         [0048]    During the loading process it is possible to encounter difficulties with balance, so it is advantageous to have a support at each end of the transporter. At one end of the frame member  32  there is a caster wheel, as described above, and at the other end there is provided a fold-up jack  130  that can best be seen in FIGS. 18 through 21. Jack  130  is comprised of three primary elements—a bracket to affix it to the transporter, a telescoping ground-engaging member and an over-the-center mechanism to bias the ground-engaging member into either the up or down position.  
         [0049]    More specifically, there is provided a three-sided channel shaped bracket  132 , with the open side facing the rearward direction. The opposing lower edges of the bracket have formed therein opposing notches  134 . An outer tube  136  is pivotally affixed to the bracket by bolt  138  for movement through the open side of the bracket between the down, ground-engaging position and the up disengaged position. An inner tube  140  is telescopically and movably fitted within the outer tube  136 . On the lower end of inner tube  140  is a ground-engaging foot  142 , while on the other end is a stop  144  affixed near the end of the tube and rigidly supporting a guide rod  146 . Fitted around the guide rod  146  is a pair of concentric compression springs  148  that extend between the stop  144  and bolt  138  to bias the two tubes apart, i.e., bias the inner tube longitudinally away from bolt  138 . An additional bolt  150 , with spacers  151  and  152  thereon, extends through the inner tube in a position to engage the notches  134  in bracket  132 . The holes in outer tube  136  through which bolt  150  extends are actually longitudinal slots that allow adequate longitudinal movement of bolt  150  to engage and disengage spacers  151  and  152  with notches  134 . A tension spring  154  is connected at one end to flange  156  and at the other end to handle  158 . The relationship between the connection points of spring  154  and the pivot point  138  of outer tube  136  establish an over-the-center mechanism that will bias the two tubes either in the down position or the up position.  
         [0050]    In operation, before loading the implement onto the transporter, the operator will move jack  130  into the ground-engaging position, shown in FIG. 19, with handle  158 . In this position, spring  154  holds jack  130  in the down position for potential ground engagement. The implement is then backed onto the transporter as shown in FIG. 10, causing the wheels to engage the cross bars, raising the ramps to the transport position and securing the ramps in position. The implement is lowered and cross pins  98  move into the throat of hook  100 , securing the implement to the transporter. The end-to-end location of the ramps are such that, when loaded with the implement tongue straight in front of the implement, the weight of the implement will tip the transporter frame toward the castor wheel  44 . As the operator swings the transporter around to the transverse position as shown in FIGS. 11 and 12, the castor wheel  44  rolls on the ground, thus preventing turf damage (damage to the ground).  
         [0051]    In the full transport position, the weight of the implement comes off the castor wheel and the transporter tips the other direction, thus raising the castor wheel to clear the ground for transporting.  
         [0052]    It is possible to load the implement with the tongue extending to the left of the implement instead of in the straight-ahead position as recommended. If this happens, the weight of the implement will tip the transporter toward the end opposite the castor wheel. The jack  130  is provided to support this end of the transporter until the operator can swing the tongue to a straight-ahead position, or extending to the right of the implement such that the weight shifts onto the castor wheel.  
         [0053]    When under load, the tube  136  overcomes the force of the internal springs  148 , and forces the bolt  150  into the notches  134  of the bracket  132 , thus preventing the jack from folding up into its raised position.  
         [0054]    When the weight comes off of the jack, the inner tube will be pushed back out by the force of springs  148  and the spacers will slide back down out of the notches  134 , thus freeing the jack to pivot back up to the retracted position as the transporter moves forward and the jack contacts the ground or a bump or other fixed object. The preload on springs  148  prevents the inner tube from sliding back up into the notches when it encounters an obstacle. Properly set, very little horizontal force is required to pivot the jack into its raised position compared to the vertical force required to overcome the spring force.  
         [0055]    It will be understood that changes in the details, materials, steps and arrangements of parts, which have been described and illustrated to explain the nature of the invention will occur to and may be made by those skilled in the art upon a reading of this disclosure within the principles of the scope of the invention. The foregoing description illustrates the preferred embodiment of the invention; however, concepts, as based upon the description may be employed in other embodiments without departing from the scope of the invention. Accordingly, the following claims are intended to protect the invention broadly, as well as in the specific form shown.