US2020245A - Apparatus for handling material - Google Patents

Description

Nov. 5, 1935 w, s HOWARD 2,020,245

APPARATUS FOR HANDLING MATERIAL 5 Sheets-Sheet 1 Filed Dec. 14, 1932 llulllyl INVENTOR Wi/fiam 6. Howardp WM ATTORNEYS.

NOV. 5, 1 935. w 5 HOWARD 2,020,245

APPARATUS FOR HANDLING MATERIAL. v

Filed 1290514, 1952 5 Shets-Sheet 2 ATTORNEYi w. s. HOWARD ,U2,$

APPARATUS FOR HANDLING MATER Filed Dec. 14, 1932 5 Sheets-Sheet 3 INVENTOR W/Y/IO/m 6'- Howara! $15M WoQuavs Patented Nov. 5, 1935 PATENT OEF'F-IQE APPARATUS FOR HANDLING MATERIAL William S. HowardyNew York, N. Y., assignor to B. Nicoll..& 00., Inc, New York, N. Y., a corporation of N ew, York Application December 14, 1932, Serial No. 647,141

7 Claims.

J This invention relates to material handling aprparatus and hasforan object the provision of improved apparatus for loading an elevated con- ,tainer suchas the body. of a vehicle and for tiltingthe body to dump material therefrom.

Sanitary requirements have led in recent years to the development of enclosed bodies for ash and refuse collecting vehicles in order to.minin1ize the dissemination of dust and odors when the vehicle is being loaded or when. it is traveling alongthe streets. largesize and have their filling openings near the tense that manual loadingis inadvisable. It is preferable, since motive power is available on the automotive vehicles now in general use, to elevate and load material bypower taken off from the powenpnit of the vehicle. Would. require considerable time and effort to These bodies are usually of Moreover, since it unload the body by manual labor, it is also usual to ,unload by power, as by tilting the body to ,j dump @the material.

- Automotive vehicles with power loading and dumping, means have been built or proposed heretofore. but many of them because of unsatis- .25

failed to achieve their intended purpose. What- 'factory operation or expensive construction have ever may have been the reasons, such vehicles have not come into very general use, and it is the purpose of the present invention to provide a vehicle of this general type which will be sufficiently simple, reliable and inexpensive to. recommend itself to the trade.

-A selected embodiment of the invention will .now be described in order to explainthe principles and advantages of the invention. In the accompanying drawings which illustrate this embodiment:

Fig. 1 is a partial side elevation of a truck embodying the invention;

Fig. 2 is a front elevation taken behind the cab and in front of the hoist cylinder.

A Fig. 3 is a front'elevation partly in section =-taken behind the hoist cylinder with the body loader in elevated position;

, Fig; 4 is a longitudinal section on an enlarged scaletaken on the line 4+4 of Fig. 2, showing ---mechanism for holding the body loader in elei 5-5 of Fig. 4;

Fig. 6 is a transverse section taken on the line Fig. 7 is a horizontal enlarged section taken on theline 1-'-1 of Fig. 2;

Fig. 8 is an enlarged vertical section taken on the line 8-8 of Fig. 3;

Fig; 9 is a side elevation with the body in dumping position.

.As shownin Fig. 1, the vehicle or truck on which the improved apparatus is mounted according to. the illustrative embodiment, comprises a chassis l 8, wheels I2, cab 13, motor and power take-oil (not shown), body frame l4, hydraulic hoist i5 supp-lied with fluid by a pump it (Fig. 2) which is driven by the power takeoff, and a dump body H. The body is pivoted on each side' to turn about the axis It for dumping.

The rear door l9 of-the body is held closed except when dumping by the latches 26 at either side.

Means are provided for loading material into the body by power. As shown in Figs. 1, 2 and 3, such power loading means in the present case is mounted on the side of the vehicle and comprises tracks 23 mounted near each end of the body and extending from a point near the ground to the top of the inclined side 28 of the body. The top 25 of the body overhangs the side '24 and covers an opening at the outer side of the body for receiving a bucket 26 employed for loading the body. The bucket extends substantially the full length of the body and-is providedwith wheels 21 at each end which ride in grooves in the tracks. Theends of the bucket opening of the body-between the side 24 and the top 25 are closed at the front end by the end plate of the body and at the rear end by a smaller plate (not shown) at the upper corner of the rear door [9.

The bucket is raised by flexible tension devices such as cables 28 attached at 29 to each end of the bucket. The cables pass over idler sheaves 36 mounted on shafts 35 above the upper end of the track and are attached to large pulleys 32 rigidly mounted on the longitudinal hoist shaft 33. The upper ends of the tracks are formed as separate sections and are hinged at their upper ends so as to lift with the bucket as it is being emptied. The bucket and rail sections may be returned by gravity or by auxiliary means such as springs (not shown). -The travelling position of the bucket is shown; in Fig. 3. This figure also shows the emptying position of the bucket in dotted lines. Here it is held withinthe entrance to thefhood so as substantially to fill the same and prevent the spread of dust and odors. The bucket is maintained in this raised position by a dog 36 (Figs. 4 and 6) provided with a lug 3'1 adapted to engage a lug 38 on the front end of the pulleys 32. The dog36 is slidable along the shaft 33 and is held against rotation by engagement with some fixed part of the body. The dog is operated by a control rod (with suitable linkage if desired) from a manual operator arranged at some convenient place on the body.

The shaft 33 at its front end is provided with a pulley 4| to which is attached one end of a cable 42 and upon which the cable is wound when the bucket descends. The cable 42 passes over a sheave 43 on the front end of the body, thence downward beneath a sheave 44 of a yoke frame 45, up over a sheave 46 secured to the upper end of the hydraulic hoist plunger 41, and finally downward to a fixed point of attachment 48 to the truck chassis. The yoke frame 45 is associated with the body and moves therewith when the body is being dumped but at the time now being considered, i. e., when the bucket is being operated, the frame is securely anchored to the truck chassis by latches 49.

The hydraulic piston has a limited stroke in order to prevent it from rising to an undesirable height. Its upward movement is limited to a height about the same as the top of the body so that the body will protect the piston in case the truck should ever be driven along the street with the piston raised. If an overhead obstruction were encountered while the truck was moving it is evident that the hydraulic hoist would be damaged. The bucket, however, has a greater travel than the hoist would normally provide even after taking into consideration the doubled loop of cable upon which the hoist piston operates. That is, the length of bucket movement is more than twice the length of the piston movement. This difference in lengths of strokes is taken care of by making the pulleys 32 for the bucket cables 23 larger than the pulley 46 for the hoist cable 42. A greater length of the cables 28 will thus be wound up for each revolution of the shaft 33 than will be pulled out in the cable 42 from the small pulley 4|.

It has been noted that the bucket is carried in an elevated position beneath the hood when the truck is travelling. It is ordinarily kept there while the body is being dumped. The hoist piston is lowered at such times so that there is a tendency for the formation of slack in the cable 42. Means are herein provided, however, for taking up this slack. The means adopted comprises (Figs. 4 and 5) a convolute spring 52 attached at its imier end to a sleeve 53 which is fast on the shaft 33 and attached at its outer end to the pulley 4| which is rotatable about the shaft 33. A disc 54 is rigidly secured to the shaft and is provided with a lug 55 interacting with a lug 56 on a loose intermediate disc 51. The disc 51 is provided with a lug 58 interacting with a lug 59 formed on the pulley 4|. This mechanism provides free movement of the pulley 4| to enable the spring to take up slack in the cable while at the same time providing a positive drive of the shaft 33 in the direction to raise the bucket. The intermediate disc is provided to permit more than one complete revolution of the pulley 4| on a the shaft 33. If more turns are needed more discs may be built into the mechanism.

The one hoist is employed for dumping the body as well as for raising the bucket. The same cable (42) is also employed. This is accomplished as follows. The yoke frame 45, which is movable with the body and through which the body is raised, is disconnected from the chassis and connected to the cable 42. The cable is provided with a fixed collar 62 which is adapted to be engaged by a forked hook 63 mounted on the frame. The hook 63 and the latches 49 are interconnected by rods 64 whereby they are operated coordinately when the operator moves the manual control rod 65, the hook engaging when 5 the latches disengage and vice versa. When the hook 63 engages the cable 42 the hoist piston is in its lowermost position to insure that the collar 62 is below the hook.

Now, if it be assumed that the frame 45 is attached directly to the body, it will be seen that when the piston is again raised it will raise the body since one end of the cable is still attached to the chassis at 48. The other end of the cable beyond the collar 62 has no movement relative to the sheave 44 of the yoke frame 45 so it will raise the yoke frame to raise the body.

Actually in the present embodiment this simple movement does not take place because the mechanism is designed to multiply the effective length of piston stroke as applied to the body. An increased lift or distance advantage is desired, first, because the piston stroke is limited and second, because the body is long and requires a high elevation of the front end to give the proper dumpingangle. If the body were shorter this might not be required. Herein the yoke frame is provided with depending tension links 66 which are attached by pivot pins 61 to the lower ends of I-bars 68 which are slidably mounted in guides 69, 10 on the front end of the body. The lower guides 10 are provided with rollers 1| to permit easy sliding movements of the bars therethrough. Cables I2 are attached at one end to the upper portion of the bars 68 and at the other end to the chassis side frames at a point forward of the hinge axis of the body. Intermediately the cables pass under sheaves 15 mounted on the front end of the body.

Normally the body when down rests directly on the chassis but in all raised positions the weight of the body is borne by the cables 12 through the sheaves T5. The cables 12 tend to straighten as the body is raised and lift the body relative to the bars 68. Thus the body is raised higher than the yoke frame and I-bars are raised by the hoist. The tendency of the cables to straighten out is due to the location of the cable anchorage on the chassis frame. When the body is down the lower portion of the cables between the sheaves 5'0 15 and the point of attachment to the chassis constitutes the side of a triangle; whereas when the body is raised the corresponding portion constitutes the longer side of a triangle. Consequently this portion of the cables must increase in length, which decreases the length between the sheaves and the point of attachment to the I-bars and hence raises the body relative to the I-bars. Of course, if the cables were attached to the chassis. at the hinge axis of the body there would be no advantage in length and the body would be raised only as much as the I-bars were raised, for in this case the triangle becomes an isosceles triangle.

After dumping and when the body is lowered the hook 63 is disengaged from the cable and the latches 49 are simultaneously engaged with the chassis to hold the yoke frame down in preparation for operation of the bucket.

Considering the operation in review and starting with the body, bucket and hoist all in their 70 lowermost positions, the operators fill the bucket with material. The hoist is operated to raise the bucket to its upper position to load the material into the body. The upper end of the track partakes of this upward movement and assists in the 7 5 with the bucketdown ii there are no obstructions butfor longer drives or when there are obstruc-- tions the-bucket is carried in its upper position.

It maybe held in upper position either by leaving fluidthe hoist cylinder or by latching the bucket in raised position by the dog 36 asdesoribed. When taking-long trips and especially after the-body is loaded it is much better to latch the bucket up and allow the piston to retract;

When the piston retracts while the bucket is raised the spring device takes up the slack in the cable 42 to bring the collar 62 on the cable beneath the hook 63.

When ready to dump the body, the yoke frame latches 49 are released from the chassis and the hook 63 is engaged with the cable 42. The hoist is operated and through the mechanism described raises the body relative to the chassis and relative to the yoke frame and I-bars.

After dumping, the parts are returned and the yoke frame is again secured to the chassis. To begin loading, the hoist is operated to elevate the bucket and the dog is released to allow the bucket to descend. The loading is conducted as before.

From the above description it will be seen that the single power hoist and certain mechanism associated therewith is used both for loading the body and for dumping the body. Also that improved mechanism is provided whereby the lift distance of the hoist is increased both for loading and for dumping. Furthermore, improved means are provided for taking slack fromthe hoisting cable and for holding the bucket in elevated position independently of the hoist. The invention resides in various features and combinations which have been concretely illustrated herein but which it is realized may be variously modified. The invention is, therefore, not to be regarded as limited except by the prior art and the scope of the subjoined claims.

I claim:

1 In a material handling device in combination, a base frame, an elevating body mounted on said base frame, a body loader mounted for vertical movement relative to said body, a power hoist mounted on said base frame, a sheave on said hoist, a lifting frame provided with means for selectively attaching it to said base frame or releasing it therefrom, said lifting frame being mounted upon said body and adapted to raise the same, a sheave on said lifting frame, a hoist shaft on said body, a power pulley on said shaft, a flexible tension member attached to the base frame at one end, passing over said hoist sheave, passing beneath said lifting frame sheave and being wound upon and attached to said power shaft pulley at its other end, means for attaching said lifting frame to said tension member when released from said base frame, and means for raising said body loader from said power shaft.

2. In a self-loading vehicle in combination, a chassis frame, a body mounted thereon, a body loader, a power shaft on the body, flexible lifting connectors between said loader and said shaft, a flexible power connector for operating said shaft, means for locking said loader in elevated position independently of said flexible power device,.andmean.s for taking up slack in said flexible power. device.

3.jIn a self-loading vehicle in combination, a chassis frame, a body mounted thereon, a body loader, a power shaft on the body, flexible lifting connectors between said loader and said shaft, a flexible power connector for operating said shaft, means for locking said loader in elevated position independently of said flexible power connector, and means for taking up slack in said {0i flexible power connector, said siack-take-up comprising a pulley on said shaft for said flexible power connector, a spring for rotating said pulley independently of the shaft and means for positively limiting the-movement of said pulley in the driving direction.

4. In a material handling device in combination, a base frame, a dump body on the frame hinged at its rear end, a body-loading bucket mounted for vertical movement relative to the body, a power device including a reciprocable plunger mounted on said base frame, a sheave on the outer end of said plunger, a yoke frame provided with means for selectively attaching it to the base frame or releasing it therefrom, a sheave on said yoke frame, a pulley shaft on said body, cables for lifting said bucket by the rotation of said shaft, a power sheave on said shaft, a power cable secured at one end to said main frame, thence passing over the sheave on said plunger, thence under the'sheave on said yoke frame and thence to said power sheave where its other end is attached, means for selectively attaching said power cable to said yoke frame at a point along the length of the cable, and means for operatively connecting the yoke frame to the front end of the dump body.

5. In a material handling device in combination, a base frame, a dump body on the frame hinged at its rear end, a body-loading bucket mounted for vertical movement relative to the body, a power device including a reciprocable plunger mounted on said base frame, a sheave on the outer endof said plunger, a yoke frame provided with means for selectively attaching it to the base frame or releasing it therefrom, a sheave on said yoke frame, a pulley shaft on said body, cables for lifting said bucket by the rotation of said shaft, a power sheave on said shaft, a power cable secured at one end to said 5 main frame, thence passing over the sheave on said plunger, thence under the sheave on said yoke frame and thence to said power sheave where its other end is attached, means for selectively attaching said power cable to said yoke frame at a point along its length, and means for operatively connecting the yoke frame to the front end of the dump body, said connecting means comprising links pivoted to the yoke frame and extending downward below the main frame when the body is down, slidable bars mounted on the front end of the body and pivotally attached to said links at their lower ends, sheaves on the lower front end of the body, cable anchorages on said main frame at a distance from the hinge line 65 of the body thereon, and body-lift cables attached to said anchorages at one end, passing under said sheaves and attached at their other ends to the slidable bars at a point which is considerably above the lower edge of the body when 7 it is down.

6. In .a material handling device in combination, a base frame, a dump body on the frame hinged at its rear end, a body-loading bucket mounted for vertical movement relative-to the body, a power device including a reciprocable plunger mounted on said base frame, a sheave on the outer end of said plunger, a yoke frame provided with means for selectively attaching it to the base frame or releasing it therefrom, a sheave on said yoke frame, a pulley shaft on said body, cables for lifting said bucket by the rotation of said shaft, a power sheave on said shaft, a power cable secured at one end to said main frame, thence passing over the sheave on said plunger, thence under the sheave on said yoke frame and thence to said power sheave where its other end is attached, means for selectively attaching said power cable to said yoke frame at a point along the length of the cable, and means for operatively terlocking elements for causing the cable to be i detached from the yoke frame when the latter is attached to the main frame and vice versa.

WILLIAM S. HOWARD.

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