US 3702662 A
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Description (OCR text may contain errors)
Nov. 14, 1972 F- K. DAVIEAU 3,702,662
LIFT AND DUMP APPARATUS Filed Sept. 30, 1971 2 Sheets-Sheet 1 INVENTOR.
FEZ/X A. DAV/40 A T TOR/VE Y FIIE- NOV. 14, 1972 DAWEAU 3,702,662
LIFT AND DUMP APPARATUS Filed Sept. 50, 1971 2 Sheets-Sheet 2 F'L/X K. DAV/[4U /Lw i fuJ United States Patent US. Cl. 214-302 4 Claims ABSTRACT OF THE DISCLOSURE A lift and dump means for rear end opening collectors wherein fixed identical cam plates are secured rearwardly at either side of the collector in a vertical plane, the cam plates being formed with an upstanding finger immediately adjacent a short inwardly cut throat. A transverse rotating shaft journalled in said cam plates rotated by any suitable means from the side only; a pair of depending arms rigidly connected at their lower extremities with a rigid transverse rod which are all mounted as a unit on and for rotation with said shaft. A pair of hook members also mounted on and for rotation with said shaft at either side and in juxtaposition with said cams, said hooks adapted to engage horizontal extensions on a refuse container, guiding them over the cam surfaces and locking them in the said throat during dumping.
BACKGROUND OF THE INVENTION There have been numerous attempts to solve the increasingly important problems of refuse collection. The advent of a relatively standard individual refuse container having a rectangular cross-section with horizontal extensions at either side at the front thereof, has greatly aided the service of storage and collection.
The dumping or emptying of these containers into collection units was first done manually. It required two men to lift and empty the container and its contents into a back-loading collection truck. This work was time consuming and exhausting. Then came semi-automatic means, leading onward to automatic lifting and dumping means. Automatic means still required two men to attach the container and the same two men to operate the lifting and dumping mechanism-one at either side. The
work was much less fatiguing but became more dangerous from side slippage and dropping. Time studies showed that the operation took more than two minutes per container to attach, dump and detach.
Safety devices were added in the form of chains and locks. This increased the weight of the equipment and pay load, with more power required to lift and dump and the whole situation became ponderous and expensive. The time to handle each container increased significant- 1y.
SUMMARY OF THE INVENTION The present invention provides a simple inexpensive means for handling the lifting and dumping of standard refuse containers. The positive action locks the container to the vehicle or collector so there is no danger from side slippage or dropping. In this manner all of the safety requirements and more are embodied in the structure and operation.
The simplicity of the equipment has reduced the weight and ponderousness of the structure so that very little additional weight is added to the collection unit making more power for less weight to carry out the lifting and dumping operation.
Power for the lifting, dumping and handling of refuse containers is by hydraulic means, although any suitable source of power may be employed. The power is at one side of the collection unit only and can be 3,702,662 Patented Nov. 14, 1972 'ice operated by only one man. In fact the whole operation can be carried out by one man, who merely guides the refuse container to the collection unit with the lateral members abutting the cam surfaces, then initiates the power and the apparatus does all of the rest including the return of the empty container to the position where it can be rolled away.
All of this is done by one man only, safely and in less than half a minute per container. Easy extrapolation will demonstrate the far reaching benefits.
Further objects are to provide a construction of maximum simplicity, economy and ease of assembly and disassembly, also such further objects, advantages and capabilities as will fully appear and as are inherently possessed by the device and invention described herein.
The invention further resides in the combination, construction and arrangement of parts illustrated in the accompanying drawings, and while there is shown therein a preferred embodiment thereof, it is to be understood that the same is illustrative of the invention and that the invention is capable of modification and change and comprehends other details of construction without departing from the spirit thereof or the scope of the appended claims.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective fragmentary rear portion of a dump truck or refuse truck, with a refuse container to be emptied.
FIG. 2 is a horizontal sectional view taken on the line II-II of FIG. 1 and also showing in broken lines the juncture of the container with the dumping mechanism in operative position.
FIG. 3 is an enlarged side elevational view of the engaged position of the container with the dumping mechanism, showing in broken lines the engagement of the hook-cam which initiates the dumping operation; and
FIG. 4 is a similar fragmentary side elevation showing the container in the dumping position and locked by the hook-cam arm in this position.
DESCRIPTION OF PREFERRED EMBODIMENTS Referring now to the drawings and with particular reference to FIG. 1, there is shown in fragmentary perspective the rear dumping mechanism of a standard refuse truck 10. Particularly the entire rear end of the truck opens up to provide a receiving chamber 11. This chamber is defined by the side walls of the truck 12 and 14. There is a heavy gauge cross brace member 15 which is part of the structural strength of the truck itself. At either side and along the marginal edges of the rear portions of walls 12 and 14, are parallel and rearwardly extending cam plates 16 and 17. These cam plates are identical and are shaped to perform the functions required of the dumping operation. -Each of the cam plates 16 and 17 have upwardly extending thumbs 18. The outer edge 20 of the thumbs 1-8 are curved inwardly and downwardly and terminate smoothly in an open U-shape socket 21. The opposite wall of the socket 21 extends upwardly and outwardly a shorter distance to a slightly curving and rearwardly sloping cam face 22. Surface 22 is substantially flat during the main course of travel. Cam plates 16 and 17 then extend downwardly and inwardly as at 23 in a curve, which adds strength and rigidity to the paltes and their intended functions. Cam plates 16 and 17 are, of course, rigid and do not move. Each plate 16 and 17 is drilled through at 24 to permit the passage of the shaft 25 therethrough and the shaft 25 is journalled for rotation therein, the ends of said shaft projecting outwardly beyond both cam plates 16 and 17. The shaft 25 has central support braces 27 with suitable bearings 26, said supports 27 being welded to the transverse truck frame member 15.
At either side and outwardly of the walls 12 and 14, there is a spaced support arm 28 at the forward end of which a spacer 30 secures it in any suitable manner, to the outside of the Wall 12 (or 14) and its framing. The rearward end of the arm 28 provides conventional journalling for the outer end of shaft 25. The spacer 30 is so constructed as to pivotally receive the forward end of a hydraulic cylinder 31 so that it may move in a vertical arc. The piston 32 of the hydraulic cylinder 31 is attached to linkage 33 at one end. The other end of linkage 33 is secured in any suitable manner to the shaft 25 for rotation thereof and therewith, just inside the bearing of arm 28. Thus by movement of the piston 32 of the hydraulic cylinder 31 the linkage is moved rearwardly and rotates the shaft 25 in a counter-clockwise movement.
Secured in any suitable manner to the shaft 25 just inwardly of the inner faces of the plates 16 and 17 are a pair of U-shaped cam-hook arms 34 which rotate with the shaft 25. These are sickle-like in shape and terminate with a hook portion 35.
Also attached to the shaft 25 for rotation therewith are a pair of downwardly extending arms 37 connected at the bottom or terminating ends to a rod 36 to form a rigid construction. The rotation of the shaft 25, by means of hydraulic cylinder 31, not only rotates the cam-hook arms 34 but also the arms 37 with their rigid connecting cross bar 36.
The container 40 can be any standardized container. It is usually a rectangular container preferably tapered toward the bottom. It is mounted on casters 49, or other suitable means, so that it does not have to be lifted or moved other than by positioning the container 40 by rolling it to meet the truck for emptying and returning it to the receiving placement. Of prime importance are the laterally extending rod members 41 at either side adjacent the front thereof. Obviously these rod members may be a single bar which is secured at this location in the front of the container and can be welded or secured thereto in any suitable manner. The members 41 do have to have lateral strength sufficient to accommodate the purposes of this invention. At the outer ends of 41 are secured knobs or buttons 42 which prevent any possible lateral disengagement. The hydraulic controls for the operation of cylinder 31 are accomplished through connections 43 and 44 and are conventional. It is also apparent that the controls can be operated from either side of the truck without any wasting of time in moving from one side to the other.
OPERATION The operation of this dumping mechanism is quite simple and effective. It is possibly best seen and described with reference to FIGS. 3 and 4 wherein the outer protective arm 28 has been removed to expose the hydraulic cylinder 31, the piston 32 and the operative linkage 33. The container 40 is rolled to and positioned up to the cam plates 16 and 17 so that the rods 41 on the container engage the beginning of the flattened portion of the cam surface 22 of these plates. When this has been done the dumping operation is ready to begin. The hydraulic cylinder 31 is activated to push the piston rod 32 outwardly and rearwardly. By outward movement of the piston 32 the linkage is moved in an arc downwardly and outwardly, the straight line thrust position of the piston being maintained by the pivot 45 which is not shown in FIGS. 3 and 4. As the shaft 25 is rotated counter-clockwise, the cam-hook arms 34 are also rotated with it in a counter-clockwise direction. The hook 35 at the end of these hook-arms engages the underside of the rods 41, as shown in dotted lines in FIG. 3. Continued rotation of the cam-hook arms 34 results in engagement with rods 41 causing the lifting operation of the container 40 to commence. The rotation of the cam-hook arms 34 pushes the rods 41 upwardly along the cam surface 22 until the rods 41 drop into engagement with the U-shape receivers 21. The
drop is sufiicient to disengage the hook 35 from the rods 41. In the meantime the arms 37 with their cross bar and brace 36 are also moving with the rotation of the shaft 25. After the hook 35 has engaged the rods 41, the cross bar 36 is sequentially moved into engagement with the lower portion of the container 40 along its face 46. The movement of the parallel arms 37 with the cross bar 36 hearing on the face 46 of the container, causes the container to rise in an arc with the pivot being the rods 41 retained within the socket position 21 of the side plates 16 and 17.
As is best shown in FIG. 4, as the lateral rods 41 are dropped or moved into place within the U-shaped receiver 21, the inner face 48 of the cam-hook 34 slides over the exposed surface of the rods 41 to lock them securely within the sockets 21, at either side. The heads or buttons 42 prevent any later dislodgment of the rods 41 and keep them within the operative surface so there is no danger of lateral slippage or disengagement. The container 40 by means of the continued extension of the piston rod 22, raises the container 40 into the dumping position shown in FIG. 4. Emptying of the container 40 can be accomplished by moving the controls for the hydraulic system 31, back and forth in quick succession, thus shaking everything free.
The weight of the empty container 40 as shown in FIG. 4 is sufficient so that when the hydraulic pressure is released in cylinder 31, its own weight will cause exactly the reverse of the movement described above, to bring the container 40 back to the disengaged position shown in FIG. 3. This then allows the empty container 40 to be withdrawn from the engaged position with the truck 10 and be returned to its usual place of service.
It is to be understood that this equipment can be added to any rear opening refuse truck without adding any substantial amount of weight or expensive mechanism. The operation is so simple that its very simplicity represents the success which this invention has had over its predecessors which are complicated and costly. Further this equipment can be used with any of the standardized containers which have heretofore been used on more expensive and involved equipment. It will be observed that this is a great labor saving device because the operation requires no lifting or work of any kind. It completely eliminates the fatigue and the slowing down of effective effort where any of this work is done mechanically. In many devices in use at the present time, the refuse containers are literally chained to either side of the dumping device for emptying. This takes at least two to three minutes to dump a single refuse container. With the equipment described herein there is nothing to get out of order, and the dumping is accomplished in a matter of seconds. It completely eliminates men at either side of the truck and can be operated by one man from either side of the truck. The saving in man-hours, and prevention of accidents caused by the fatigue of the men are most impressive.
1. lift and dump apparatus for rear end opening collector units for use with standard refuse containers having lateral extending members at either side, a pair of identical cam plates rigidly attached at either side of the collector unit, said cam plates being mounted in parallel vertical planes and each having an upstanding finger immediately adjacent a short inwardly cut throat, a transverse rotating shaft journalled for rotation in said cam plates, power means mounted on the collector unit for controlled rotation of said shaft, a pair of spaced depending arm members rigidly connected at their lower extremities with a rigid transverse rod which are all mounted as a unit on and for rotation with said shaft, and a pair of spaced hook members also mounted on and for rotation with said shaft, said hook members adapted to engage the lateral extensions at either side of a refuse container lifting and guiding them over the said cam surfaces and locking them in the said cam throat during dumping.
6 2. The apparatus of claim 1 wherein the power means References Cited is at one side only and the bar engages and moves along the front face of a refuse container to aid the lift and UNITED STATES PATENTS dumping of the refuse containen 3,147,870 9/1964 Urban 6t al 214302 3. The apparatus of claim 1 wherein there is no attach- 5 3,458,071 7/1969 Smlth 214'-302 ment of the refuse container to the lifting and dumping means prior to initiation of the lifting and dumping cycle. GERALD FORLENZA Pnmary Exammer 4. The apparatus of claim 1 wherein the pivoting of L. J. ORESKY, Assistant Examiner the refuse container moves in a curve controlled by the race of the cams during the lifting, dumping and return 10 US Cl. X.R.