US1588276A - Hoist for power loaders - Google Patents

Description

June 8 1926 S. SHAFER. J.R., ET AL HOIST FOR POWER LOADERS Fild A ril 9. 1924 2 Sheets-Sheet. 1

wi d u m flvzoid Fen 5 s.

Patented June 8, 1926..

UNITED STATES SAMUEL SHAIER, JR, AND ARNOLD nnuss, or MILWAUKEE, WISCONSIN, ASSIGNORS:

PATENT OFFICE- TO CHAIN BELT COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION'OF WIS- CONSI N.

HOIST FOR POWER LOADERS.

Application filed April 9, 1924. Serial No. 705,271.

This invention relates to loading apparatus in which a vessel that receives theload or charge is periodically moved from a re,- ceiving to a discharging position,and the invention has for its object to apply the,

power that moves said charging vessel to advantage Our invention is primarily intended for use in connectionwith a charging or loading skip for a concrete mixer, whose movements are controlled by a cable connected with the skip; although the invention in its useful applications is not limited to the particular use referred to, nor to the specific mechanism which we have shown in the drawings as embodying the invention.

In the accompanying drawingsf Figure 1 is a side view of a loading skip or hopper for aooncrete mixing machine, to which our invention is applied, the receiving position of the skip and its associated and cooperating parts, being represented in full lines, the discharging position thereof by dotted lines, and anfintermediate position by dot and dash lines.

Fig. 2 is a rear elevation of the apparatus. 'Fig. 3 is a side elevation of a concrete mixin machine with a loading apparatus embo ying the present invention, of somewhat difierent construction from that shown in Figs. 1 and 2. I a

Fig. 4 is rear elevation of the apparatus shown in Fig. 3. f Intheaccompanying drawings, A designates the framework of a concrete mixing machine, the drum of which'is designated 13'. C represents the loading skip or hopper into which, when resting upon the ground or in a lowered position, a charge of materials tobe mixed is delivered, andwhich when moved to the position indicated by dotted lines in Fig. 1, discharges such charge into the drum B. The spout portion 0 of the skip has secured toits opposite sides the bars D which are pivotally connected, at E, E, with the frame of the machine. The parts thus far described are well'known in the art and serve to locate the pivot of the skip in advance of the nose or forward end of the spout section 0 thereof.

2, 2, indicate a pair of stiffiegs pivotally secured, at 3, to the opposite sides of the frame of the machine, they constituting a boom, and being located such distance apart as to ermit the spout section of the loading skip to lie and move between them. At

the upper ends of the stifllegs are supported pulleys or idler sheaves): over which pass the cable or cables 5 through which the movements of the skip C are controlled; The cable passes from the pulleys 4, over' pulleys 15 located on the upper portion of the framework A and thence to differential winding mechanism located, preferably, on the lower portion of the framework "A. This mechanism is represented as compris ing a pair of winding drums 6 anda drum 7, of larger sizethan the drums 6,around' which is wound a cable 8 that is secured also to a power driven drum 9 mountedoni a shaft 10 geared to a motor or engine. The. cable passes from one of'the winding drums 6 over idler pulleys 15 andl to, aside of the skip or loading vessel C, under the same, thence across theopposite side thereof,to and past the idler ulleys at and 15, an-d' thence to the windingdrum 6 on the side of the machine opposite the first v mentioned winding drum. The arrangementjustldescribed is employed ',in view of the large size of the skip. and the'fact that it is fre-' quently unevenly loaded, making it, desirable that the cable5 should have .twostr'ands connected respectively with theskipat its opposite sides. It will'be understood that each strand of thecable 5;.operates incon trolling the movements of the skip, and that if it were arranged at the central longitudinal axis of the skip asingle'strand of cable would be sufficient.

The support 14is represented. as atriangu- 'lar frame secured to a bar D. The parts of the loading mechanism being in thepositions represented in full lines in Fig. 1, if power be applied to the cablef), winding it upon the drums'6, it [will be drawn across the idler pulleys'or sheaves i and 15, shortening thoseportions' of the cable between the pulleys and their points of attachment to the skip, thus causing the latter to belifted and tilted about its pivotal axis E. As the skip. moves upwardly toward its discharging position, the frame 14 moves therewith, carrying the. pivoted end 13 of the link along the path indicated by the curved line a. This causes the opposite ends of thelinks, which are pivotally con? nocted with the stifi'legs 2, to follow the paths indicated by the curved line b and to swing the stifilegs 2 forwardly or in the general directi'onin which the loading skip ismoving, and in' advance of the latter, although at a slower speed. The result is that the parts assume successively the positions indicated by the dot and dash lines, and the dotted lines, in Fig. 1. It will be observed that the several parts of the loading mechanism described are sol-elated to each other that the cable 5, when'the parts are in the position for loading the skip or vessel 0, occupies a line that approximates being tan gential to the circle described by the part of the skip to which the cable is attached; in'other words, the'pul'l of the cableapplies power to lift the skip andits load to the greatest advantage. As the parts assume tlie intermedi'ate positionsbetween the skipcharging there is some variation in the angular relation of the cable to the skip, but this varia tion' is not great and the force transmitted through the cable to move the skip and its load is always'applied to advantage.

"It will be seen that in the arrangement described the parts of the mechanism employed for controlling the movements of the skip do not extend much, if any, above the framework A of the machine which is a fact of much practical importance since it permits the machine to be moved into positions that could not be occupied were thersupports for the operating cables lo cated at points high .above the drum or other operating part of the mechanism with which the loader is associated. v

' It will also beobserved that the pivots 3', uniting the stifflegs to the frame, are to the rear of the pivots E of the skip and that the pivotal connections-'13between the links 11 and the'skip are located to the rear of the pivots E and in advance of the pivots 3; and also that the pivot 13 is at less distance from the pivot '15 than is pivot 12 from pivot 3. The result of this arrange- .ment is that the stifflegs move through l'ess angularz distances'than does the skip, and

'the pulleys 4 which when the skip is in loading position are" above the hopper of the'skip, and a considerable distance in advance thereof, are'but little in advance of the skip when the hopper reaches its discharging positionfas represented by the dotted lines in Fig. 1. The path of the pulleys a is indicated by the dotted lines 0.

In Figs. 3 and 4 We illustrate an embodiment of the invention different from that illustrated in Figs. 1 and 2, corresponding parts of the two machines illustrated being designated by the same reference characters. The form of invention shown in Figs. 3 and ljfdiflersfrom theother in that the links .11,

corresponding with the links 11 of Figs.

and skip-discharging positions 1 .and 2, are pivotally connected with the stiff legs at 12 and with the skip C at 13, the latter connection taking the place of the connection 13. The movements ofthe several parts are illustrated in Fig. 3 by full lines, dot-and-dash lines, and dotted ;lines.

the same as'in Fig. 1.

What we claim is.

1." The combination with a tiltable vessel, of a cable connected thereto for operating it, a winding drum for the cable, a guide across which the cable passes in it's' course from the winding drum to the .vessel, a movable support carrying the said guide", and a permanent connection between the vessel .and support arranged to cause'the to cause the support to move in the same general direction as the vessel movesand simultaneouslytherewith.

3. The combination with a supporting frame and a loading skip pivotally united thereto, of a cable for controllingthe movements of the skip, a winding drum on the frame to which the cable is connected, a support pivoted to the frame and extending above the skip, a cable guide carried by the upper portion of the said support,across which the cable passes, and a rigidgcon- I nection pivotally united to boththe skip and the support arranged to cause the said support to be shifted. whenever the skip is moved by the cable. V

4. The combination stated in claim 3, having the connections between'the skip and support so related that the are through which the skip moves is' greate'r than that through "which the support is moved.

5. The' combination with a supporting frame and .a pivoted loading skip united thereto, of a cable by which the movements of the skip are controlled, a winding 'mechs anism for the cable upon the frame, a stilfleg pivotally supported on the frame and extending above the skip, and idler pulley supported at the upper end of the stiflleg and across which thecable passes, and a link pivoted at one endto the stiflleg, and at the other end having. pivotal connection with the skip. i

6. The combination statedin claim 5 when the stiff legs are duplicated, one being'on each side of the skip, and the connecting links are duplicated, one being associated with each stifi leg and extending to a side of the skip.

7 The combination with a supporting frame and aloading skip having a discharge spout and a loading hopper to the rear of the spout, the skip being pivotally supported upon the frame adjacent to its spout portion, of a cable controlling the movements of the skip, a Winding drum upon the frame by which the cable is controlled, a stii'Heg pivotally supported on the frame at a point in rear of the pivotal support of the skip, a guide over which the cable passes carried by the stiflieg and located above the upper portion of the skip, and a link having pivotal connection with the .stiffleg and with the skip, the latter connection being in advance of the pivot of the stifileg and to the rear of the pivot of the skip.

8. The combination with a supporting frame and a loading skip pivotally united thereto, of astiflleg pivoted to the frame, a rigid connection pivotally uniting the stiffleg and the skip arranged to cause the two united parts to move simultaneously and in the same general direction, a cable for controlling the movements of the stiflleg and skip, and a Winding mechanism for the cable.

SAMUEL SI-IAFER, JR. ARNOLD REUSS.

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