US1962445A - Dumping vehicle hoist - Google Patents

Description

June 12, 1934. c. F. HIGGINS DUMPING VEHICLE HOIST Original Filed April 3, 1925 2 Sheets-Sheet 1 Wp'mess June 12, 1934. Q F, H|GG|N$ 1,962,445

DUMPING VEHICLE HOIST Original Filed April 5, 1925 2 Sheets-Sheet 2 55 at its free end with a hoist arm 42.

Patented June 12, 1934 PATENT OFFICE DUMPING VEHICLE HOIST Clark F. Higgins, Melrosc;. Mass, assignor, by mesne assignments, to General Body & Hoist Company, Everett, Mass, a corporation of Massachusetts Original application April 3, 1925, Serial No. 20,379. Divided and this application April 25,

1930, Serial No. 447,144

2 Claims.

The present invention relates to dumping vehicle hoists, and is herein disclosed as embodied ina hoisting mechanism which is operated by power supplied by the engine of the vehicle.

The object of the invention is to provide a hoisting mechanism particularly adapted for power operation having its parts, so constructed and arranged as to. accomplish an efficient and uniform actuation of the hoisting means in liftm ing the body of the vehicle.

With this object in view, a feature of the invention resides in. the employment of a. winding shaft and hoisting chains operatively connected with the body and with? the shaft and formed with offset links to cause the chains to be wound up helically upon the shaft. The provision of a plurality of such chains insures a regular and uniform winding of the chains and uniform lifting stresses on the body at all points in the hoisting operation.

Other features of the invention consist in the novel features of construction, combinations, and arrangements of parts hereinafter described and particularly defined in the claims.

In the accompanying drawings, Figure 1 is a side elevation of a portion of a vehicle provided with a hoisting mechanism embodying the features of the present invention; and Figure 2 is a plan View, partly in section, showing the hoisting mechanism.

In the form of the invention illustrated in Figs. 1 and 2, the vehicle 10, having an engine (not shown), is provided with a clutch 12 consisting of opposed conical elements of the usual form, one

i 5 of which is connected with the usual clutch pedal 14 through a link 16, the clutch members being normally urged toward closed position by a spring 18. The clutch connects through a transmission indicated generally at 20 with a drive of any suitable form leading to the rear wheels of the vehicle. Connected with the transmission casing is a power take-01f 22 connecting through a shaft 24 and universal joints 26 and 28 with a hoist gearing mechanism contained in the eas- 5 ing 30. The hoist gearing when operatively connected with the transmission through the power take-off 22, operates to rotate a chain shaft or Winding shaft 32 journaled in bearings 34 at opposite sides of the vehicle frame, the shaft being i .59 held from endwise movement by caps 36 secured thereto outside the bearings. Secured to the shaft at opposite sides of the gearing casing are chain-connecting lugs 38 to each of which is attached the end of a chain 40 which is connected The hoist armmay beof any usual or preferred form adapted for connection withthe body 33 of the vehicle to elevate the body as the chain is wound upon the shaft by rotation of the latter. In the preferred form of the invention, the hoist in general form is similar to that shown in the patent to Lally, No. 1,387,413, the arms on opposite sides of the vehicle being connected by a depending strut 44 having enlarged bearing surfaces 46 under which the chains lead to impart an initial upward thrust to the body upon the start of the winding operation.

As shown in Fig. 2, the chains are of multiple link type with the links arranged in successive groups and the successive groups being offset the width of one link. With this construction the adjacent convolutions of each chain lie closely side by side and the chains wind helically in a smooth and even manner in contact with the shaft. Due to the uniform winding of both chains on the shaft, this construction insures regular and uniform tensions on both chains during the entire hoisting operation so that the body is lifted uniformly and without being subjected to objectionable side stresses.

From an inspection of Fig. 2 it will also be noted that the chain connecting lugs 38 are formed on sleeves secured to the shaft 32 and are each provided with a plurality of slots to re-- ceive the terminal group of links at the inner end of a chain. These lugs constitute what may be termed slot-ted anchors for the inner ends of the chains. The outer ends of the chains are attached to hauling blocks one of which is indicated at 41 on Fig. 2. These blocks are mounted upon a cross shaft connecting the pivotally mounted arms 42 and are each provided with a plurality of slots to receive the links of the terminal group at the outer end of a chain. As the shaft 32 rotates, the chains wind outwardly in 95 opposite directions on the shaft. The chains thus diverge from the shaft towards their points of connection with the arms 42 and act as guys to prevent the arms 42 from twisting laterally in either direction.

The power take-off 22, as shown in Fig. 1, comprises two gears 50 and 52 adapted for permanent meshing with suitable gears of the transmission 20 and arranged so that they are rotated in reverse directions. The gears are loosely mounted on a shaft 54 to which either the gear'50 or the gear 52 may be splined by means of a yoke 56 connected through a rod 58 with a hand lever 60 at the operators seat in any suitable manner, as will be obvious to those skilled in the art. It

will be seen that upon proper manipulation of the hand lever 60, the shaft 54 and consequently the shaft 24 may be caused to rotate in either direction. The shaft 24 connects through the universal joint 28 with a shaft 62 in the gearing casing, which shaft carries a worm 64 meshing with a worm gear 66 on a shaft 68 journaled in the casing. The shaft 68 is formed with a pinion gear '70 which meshes with a chain shaft driving gear '72 secured to the chain shaft 32. Upon rotation of the shaft 24 in one direction due to the connection of one of the gears of the power takeoff therewith the chain shaft 32 is rotated to elevate the body, and upon rotation of the shaft in the opposite direction the body is connected with the hoisting mechanism to be returned to its original position.

The power take-off and the mechanism for rotating and controlling the chain shaft form the subject-matter of an application filed April 3, 1925, Serial No. 20,379, patented May 6, 1930, No. 1,757,191 of which the present application is a division.

The nature and scope of the present invention having been indicated, and mechanism embodying the invention having been specifically described, what is claimed is:

l. A dumping hoist comprising a frame, a body, means for raising said body relatively to said frame including a pair of separated hoist arms pivotally mounted at their lower ends upon said frame and flexibly connected at their upper ends to said body, a Winding shaft, means for rotating the same, slotted anchor-blocks secured to the central portion of said winding shaft at symmetrical distances from said hoisting arms, and a pair of multiple link chains each consisting of a succession of groups of fiat links progressively offset to enable the chain to be wound helically and uniformly outwardly upon said shaft and having the group of links at its inner end pivotally mounted in the slots in said anchor-block and the group of links at its outer end flexibly connected to the upper end of the adjacent hoisting arm.

2. A dumping hoist comprising a frame, a body, means for raising said body relatively to said frame including a pair of Widely separated hoist arms pivotally mounted at their lower ends upon said frame and flexibly connected at their upper ends to said body, a cross shaft connecting the upper ends of said hoisting arms, slotted hoisting blocks mounted on said cross shaft in proximity to the respective hoisting arms, a winding shaft mounted on said frame, means for rotating said winding shaft, slotted anchor-blocks secured to the central portion of said winding shaft at symmetrical distances from said hoisting arms, and a pair of multiple link chains each consisting of a succession of groups of flat links progressively offset to enable the chain to be wound helically and uniformly outwardly upon said shaft and having the group of links at its inner end pivotally mounted in the slots in said anchor-block and the group of links at its outer end pivotally mounted in the slots of said hoisting block.

CLARK F. HIGGINS.

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