US2647649A - Trash moving fork for tractors - Google Patents

Description

Aug. 4, 1953 o. MAYNARD TRASH MOVING FORK FOR TRACTORS 2 Sheets-Sheet 1 Filed June 28, 1951 INVENTOR. ONNO L. MAYNARD AT TOR NEY o. MAYNARD TRASH MOVING FORK FOR TRACTORS Aug. 4, 1953 2 Sheets-Sheet 2 Filed June 28, 1951 INVENTOR. ONNO L. MAYNARD "II H AT TORNEIY Patented Aug. 4, 1953 UNITED STATES- PATENT OFFICE TRASH MOVING FORK FOR TRACTORS ()nno L. Maynard, Portland, Oreg.

Application June 28, 1951, Serial No. 234,057

This invention relates to trash moving forks, which are particularly adapted to tractors for the moving of limbs, stumps and the like in land clearing.

The primary object of my invention is to provide a fork to be attached to bulldozers of tractors adapted to move limbs, stumps and other trash, piling the same on piles for burning.

My new and improved fork is adapted to be operated from a hoisting drum associated with the tractor. This new fork is adapted to pass underneath a pile of trash, picking the same up and elevating it to a high level from where it can be dumped on to a pile of trash to be burned.

My new and improved lifting fork is so designed as to be easily attached to the bulldozer on the tractor.

These and other incidental objects will be apparent in the drawings, specification and claims.

Referring to the drawings:

Figure 1 illustrates my new and improved lifting fork in its relation to a bulldozer, the tractor unit, the tractor and bulldozer being illustrated in broken lines, the fork unit being partially broken away for the saving of space on the drawing.

Figure 2 is a plan View of Figure 1, parts broken away for convenience of illustration.

Figure 3 is a fragmentary enlarged sectional detail, taken on line 3-3 of Figure 2.

Figure 4 is an enlarged fragmentary sectional view, taken on line 44 of Figure 2.

Figure 5 is a front elevation of Figure 1, partially broken away to save space on the drawings.

Figure 6 is an exploded perspective view of the fork assembly, parts broken away in the saving of space on the sheet.

Figure 7 is an enlarged fragmentary sectional view, taken on line '|l of Figure 5.

Figure 81s a plan sectional view, taken on line 8-8 of Figure 4. I

Figure 9 is an enlarged fragmentary detail side view of the frame and the fork assembly illustrating the automatic locking mechanism.

Referring more specifically to the drawings:

My new and improved lifting fork consists of a frame Lhaving brackets 2 forming part thereof and adapted to be removably secured to the bulldozer blade 3 as by bolts 4, the said bulldozer blade being shown in broken lines.

The fork unit itself consists of a hollow cross frame member 5, having forks 6 extending forwardly therefrom and forming part thereof. Upwardly extending brackets 1 form part of the fork assembly and have trunnion wheels 8 jour- 3 Claims. (01. 214-514) nalled thereto. These trunnion wheels are adapted to work up and down within the tracks 9 formed within the vertical uprights ill of the frame I. The trunnion wheels run up and down within the said tracks 9 and have flanges II, which are adapted to embrace the sides of the tracks 9 as best illustrated in Figures 2 and 5. This design tends to stabilize the movement of the forks up and down within the side frames [0.

Slidably mounted on the top of the forks 6 is a plow l2 for removing the trash from the forks when dumping the same on to a pile of trash. This plow consists of a base plate I3 and a back l4.

Referring to Figure 2, trunnion wheels l5 are journalled to the bottom of the base plate 13 and are adapted to be guided along the edges l6 of the fork l1. These trunnions stabilize the position and movement of the plow in its operation, and also maintain the said plow in contact with the topsurface of the forks, best illustrated in Figure 3.

Extending down and forming part of the base plate of the plow I2 is a boss or clamp l3 to which the cable I9 is dead-ended to by way of the usual cable ferrule 20. The cable [9 is trained about the sheaves 2| located at the point of the fork l1, and is brought back into the cross frame member 5 best illustrated in Figure '7, where it is trained about the sheave 22 and brought up through the opening 23 and trained about the sheave 24 located on the upper cross frame 25 of the main frame I, then trained over the sheave 26 and down to the hoisting drum 21 forming part of the tractor. The operation of this cable will be later described.

The plow I2 is maintained in the retracted position as illustrated in Figures 1, 2, 5 and '7 by the action of the springs 28, which are deadended within the cross frame 5 at 29 at their one end and connected to the cables 30 at their opposite end, the cable Silhaving its opposite ends connected to the plow l2 at 3|, referring particularly to Figures 2 and 4, the said cable operating over theidler sheaves 32 and 33. The plow is locked in this position by the dogs 34 engaging the latches 35, the said latches being part of the plow. The dogs 34 formpart of the cranks 3B, which are journalled within the brackets I at 31.

A spring 38 causes the dogs 34 to engage the latches 35, the forward movement of the latches being arrested by the cam 39 forming part of the crank which engages the stops 40, forming part of the bracket 1 as best illustrated in Figure 2.

I will now describe the operation of my new and lifting fork. The tractor is moved forward while the fork is in the position illustrated in Figure 1. The fork being raised or lowered by the usual lifting cylinder 4| on the tractor, which raises and lowers the bulldozer blade 3 by way of the side members 42. The fork is forced underneath a pile of trash after which the hoisting drum 2! is started to revolve, reeling up the cable 19 lifting the forks to the broken line position.

At this point the arm 43 of the crank 36 engages the stops 44 located on the vertical frames 10. This unlatches the dog 34 from the latch 35 releasing the plow, and on further operation of the hoist 27 the plow will be forced forward by the pull of the cable forcing the load of trash off the ends of the forks. The pull of the cable in operating the plow is of sufiicient pressure to maintain the forks in their raised position until the plow reaches the endof its travel as indicated by the position in Figures 1 and 6.

Referring to Figures 1, 2, and particularly 9, a positive means of holding the forks in the broken line position as indicated in Figure l is provided by a spring hanger 50 which is secured to the uprights 9 at 51. When the fork is raised to the position shown in Figure 1, the bell crank 43 strikes the stop 44, this 'disengages the hook 34 from the dog 35 permitting the plow l2 to travel towards the dotted position from the position shown in Figure 9 to the dotted position shown in Figure 1. The arms 54 carried by the plow 12 also strike the hook 50 of the hanger at the same time the bell crank 43 engages the stop 44. This moves the hanger to the position illustrated in Figure 9, and when the plow moves away forward, these arms will permit the hook 50 to engage the pin 52, which will support the fork assembly until the plow is returned to the position shown in Figure 9, when it will engage the hook 511 unlatching the same from the pin 52 and allowing the fork assembly to lower, at which time the hook 34 will engage the dog 35 holding the plow in this position until again disengaged by the arm 43 engaging the stop 44.

The fork l 7, referring to Figure 3, is so shaped as to protect the cable I9 and provide tracks 45 on which the trunnion wheels I5 operate.

What I claim is:

1. Apparatus for moving trash, comprising a frame, a hollow casing from which project a series of forks, flanges projecting from the casing, rollers on the flanges, said rollers operating in the guideways, a plow slidably mounted on the forks, means for locking the plow to the series of forks including triggers, trips on the frame with which the triggers cooperate to release the latches when the forks and plow are elevated, means between the frame and the forks for holding the latter in elevated position, means for elevating the forks and plow to latch releasing position and by continued operation slide the plow outwardly on the forks, means for returning the plow to the rear of the forks while elevated, after the elevating means has been released, and means for freeing the forks and plow from the frame to permit same to drop by gravity to normal position.

2. Apparatus for moving trash comprising a frame having a pair of vertical guides, a series of connected forks including a rear hollow cross bar and a pair of flanges, rollers on the flanges to operate in the vertical guides, a plow supported on the forks, latches between the hollow cross bar and the plow, the latches having spring actuated triggers, pins extending outwardly from the flanges, projections extending rearwardly from the plow, a cable attached at one end to the plow and trained over pulleys to a point above where the forks are to be elevated, means between the plow and the hollow cross bar for returning the plow to the rear of the forks after the plow has been advanced to a forward position on the forks, logs on the side of the frame in the path of movement of the triggers, spring catches on the front of the frame in the path of movement of the rearwardly ex ending projections, and means for-pulling the cable, whereby, when the cable is operated the forks and plow will be elevated together until the triggers contact with the lugs to release the latches and the pins engage the catches, while continued pull on the cable will project the plow forwardly on the forks, slacking of the cable permitting return of the plow to the rear of the forks for the projections to contact with the catches to release said catches from the pins to permit the forks and plow to fall by gravity.

3. Apparatus for moving trash comprising a frame having a pair of vertical guides, a series of connected forks slidably mounted in the vertical guides, a plow mounted to slide on the forks, means to normally retract the plow against the frame, catches near each end of the plow, latches mounted on the forks to engage the catches to lock the plow to the forks until the forks reach an elevated discharge position, the latches having rearwardly extending arms, springs on the latches to retain them in engaged position with the catches, lugs on the frame to engage the arms to disengage the latches when the forks and plow have reached elevated discharge position, pins extending from the sides of the forks, yielding supports projecting from the frame to engage under the pins and hold the forks and plow in elevated discharge position, projections on the plow to disengage the yielding supports from the pins when the plow is retracted from discharge position and a single cable attached to the bottom of the plow and trained over rollers under the forks and connected to a source of power to elevate the forks and plow and thereafter slide the plow on the forks, the plow being retracted on the forks when the cable is slackened and the projections engaging the yielding supports to disengage the same from the pins to allow the plow and forks to fall by gravity and the latches to engage the catches to hold the plow and forks together.

ONNO L. .MAYNARD.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 2,306,474 Tieslau Dec. 29, 1942 2,387,764 Maxwell Oct. 30, 1945 2,397,045 Richey Mar. 19, 1946 2,418,661 Palm Apr. 8, 1947 2,421,472 Way June 3, 1947 2,460,544 Smith Feb. 1, 1949 2,468,378 Scofield Apr. 26, 1949 2,485,110 Pokorny Oct. 18, 1949

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