US2508537A - Wagon hoist - Google Patents

Description

May 23, 1950 Filed Dec. 9, l19616 E. C. POLLARD WAGONHOIST 2 Sheets-Sheet l May 23, 1950 E. c. PoLLARD WAGON HOIST 2 Sheets-Sheet 2 Filed Dec. 9, 1946 Patented May 23, 1950 WAGON HOIST Ernest C. Pollard, Welcome, Minn., assignor to Super Six Mfg. Inc., Minneapolis, Minn., a corporation of Minnesota Application December 9, 1946, Serial No. 715,024

(Cl. 21d-46.5)

2 Claims. l

This invention relates to a hoisting and tilting device to be used primarily in the unloading of vehicles.

Formerly such tilting devices were of a nonportable type generally actuated by a hydraulic cylinder in combination with a weighing scale platform or a permanent unloading platform, Such tilting devices could not readily be moved from one location to another.

If such devices were portable, they had heavy overhead superstructures which made them topheavy and cumbersome for moving and could not readily be moved over the ground.

' It is an object of the present invention to provide a novel and improved hoisting and tilting device of relatively simple construction which can be used as a hoist and is primarily designed to tilt load-carrying vehicles which are not adapted with a dumping mechanism, thus facilitating easier unloading of such vehicles.

It is a further object of the present invention to provide a novel and improved hoisting and tilting device of relatively simple and compact construction having a low center oi gravity adapted to be movable from one locality to another over reasonably rough ground without diiculty.

It is a further object of the present invention to provide a novel and improved safety device for retaining the front wheels of the vehicle to be unloaded, which safety device also forms a ramp when in lowered position making the carriage easily accessible.

A further object is to provide a novel and improved hoisting and tilting device having an easily operated single control for elevating, lowering, or retaining in elevated position the carriage, thus reducing the danger of fracture of the parts by instantaneous reaction to this control.

Another object is to provide a novel and improved hoisting and tilting device having in combination with a vertically movable carriage mounted in a, supporting frame, a rotary driving element, a retaining element in spaced relation thereto, and a shiitable driven element selectively engageable with either said driving element or said retaining element.

These and other objects and advantages of my invention will more fully appear from the following description made in connection with the accompanying drawings wherein like reference characters refer to similar parts throughout the several views and in which:

Fig. 1 is a perspective view showing the entire structure with a movable carriage in raised position.

Fig. 2 is an end elevation view showing carriage elevating and retaining mechanism, its mounting on the support frame, and also showing in dotted lines the front wheels and parts of the tilted vehicle with carriage in raised position.

Fig. 3 is a vertical central sectional view of the operating end, showing the operating mechanism in greater detail.

Fig. 4 is a transverse Vertical sectional view looking toward the right as viewed in Fig. 1; and

Fig. 5 is a section view through the line 5-5 in Fig. 3 showing in detail the end mounting of the carriage in the vertical support members.

My improved hoisting and tilting device includes a pedestal type supporting frame designated in its entirety by the letter S, shown in Fig. 1, a carriage C having its end portions mounted for vertical movement in said supporting frame S, said carriage being adapted to receive and elevate the front wheels of a vehicle for tilting said vehicle, a rotary driving member E mounted on said supporting frame S, a retaining member R mounted on said support S in spaced relation to said rotary driving member E. and a shiftable rotary driven member M interposed between said driving member E and said retaining member R., and means for exibly connecting said driven member M with said carriage C.

The frame assembly S comprises a base B shown in Fig. l adapted to be moved over the ground in a sled-like manner, two vertical support posts Pn and Pf attached to said base B and comprising spaced vertical guide members 5U. and 5b, which in the form shown are merely two steel angles. There is also a machinery support frame F attached to support post Pn and to the base adjacent to the post P11. and on the opposite side thereof from the carriage. Attached near the center to the base B are sheaves and 34 as shown in Fig. 1. Also as shown in Fig. l sheaves 35 and 36 are attached at the top of Pf and Pn respectively.

The carriage C comprises a rectangular carria-ge frame 6 having a carriage platform or plate i mounted thereon and having longitudinal wheel retaining wing members W attached for oscillation on rocker arms 8, bestvshown by Fig. 4. A pair of rocker arms 8 are mounted transversely on each end of the carriage C adapted to oscillate about pivot pins 9, beveled edges In of rocker arms 8 abutting against the top flat surface of the transverse carriage frame members Il thus limiting rotation about pins 9. f

Pivotally connected to the free ends of rocker arms 8 are the lower ends of toggle arms I2 having their free ends pivotally connected to sheaves I4.

As shown in Fig. on each end of the carriage 6 mounted midway on transverse members l I are support angles Ila for attaching short vertical channel members* I5 whichare adapted to slide between thevertical guide members 5a and 5b of each of the supporting posts Pn and Pf.

The rotary driving member E as shown comprises a rotary shaft I6 mounted transversely for rotation in bearings l1 on supporting frame' F near the base B as shownv infFig. 2, said shaft being connectible with an external independent power source at either end. Shaft l5 as shown has a medially disposed friction driving. wheel i8.

fixedV thereto. The retaining element R, as shown in Fig. 3, is mounted on supporting'frame F in spaced relation to said driving wheel iS and as show-n comprises a brake shoe I9.

interposed between. said driving wheel I3 and saidfbrake shoe hib-for selectively engaging either driving. wheel t8 or brake shoe I-, vthere is a driven wheelVZil journaled for rotation on crank shaftA 2l. TheY said crank shaft 2l Vas shown is adapted to be oscillated on its offset extremitiesor trunnion stub shafts 21a, whichy are mounted transversely on `supporting frame F in bearings '23. A lever Lis-.fixed to trunnion stub shaft 21a for oscillating said crank shaft 2| in bearings Spring 24 is-provided'tourge wheel 2@ in braking engagement with brake shoe |=9, said brake shoe i9 being adaptedy to receive and* retain said driven wheel 2.8. Alsojournaled on the crank shaft 2| and fixed to driven Wheel 2U for rotation therewith is a small sprocketwheel 25, which drives an endless driving chain 26. The chain 28 as shown is trained.- about a larger sprocket wheel 21 and a belt tightener 26a ris provided to maintain tension upon driving chain 26- urged against the intermediate portionof chain. 25- by a coil spring 2th. Sprocket wheel 21 is xed; to ashaft 28, saidshaft being mounted onthe supportingframe F for rotation in bearings 29. Also.. fixed to shaft 28 for rotation withv sprocketwheel 2'!l is a cablewinding drumA 3Q.

Y When the carriage. lC is in loweredv position,

wheelV retaining wing. members W form short ramps facilitating access to the carriage Cv of theY front wheels of. .the vehicle to be tilted and unloaded. I'f. such Vehicle is bei-ng towed, the tractor may run over the carriage C', pulling the trent wheels of the loaded vehicleY on to the said carriage C and. thenv the tractor maybe unhitched and the vehicleY tilted and unloaded. When the front wheelsy of they vehicle to be yunloaded are in place on thev carriage platform 1.,

external rotary power. can be employed` at eitherY end of the driving. shaft I6.

When this external. rotary power is appliedr to shaft l5 thus rotating driving wheel I8, driven wheel. 20 may be shifted into driving position by manually operating lever L. Lever L controls the engagement of. drivenwheel 20 with. either the driving wheel L8. or thel brake shoe t9; The driven wheel 2t inV the structure shown is the only shiftable member. Boththe brake shoe i9 and; the rotary driving wheel I8V have xed relations on frame F.

Whenl drivenwheel Zuis engaged withthe con-v stantly rotating. driving wheel I8, theY small sprocket wheel. 25. drives chain 2t, which rotatesI the. larger sprocket wheel 2.1? which turns winding drum 30. Thusr the cablest 31t and 32 are wound on drum 301 at the same rate and` both ends of 4 the carriage C are raised at equal rates. When the cables 3l and 32 are Wound on drum 30, the sheaves I4 at each end of the carriage C are elevated, thus pulling up on the toggle arms I2, which in turn rotate the rocket arms 8 through a limited angle about pins 9, said rotation being limited by the abutting ofbeveled edges In of the rocker arms 8 against theftop nat-surface of carriage transverse frame members I l. This limited rotation of rocker arms 8 about pins 9 swings the wheel embracing wing members W into raised position before the carriage platform 1 can be elevated' at all. When wing members W have been raised as far as is permitted by rocker arms 8, additional. elevating force if applied will raise lthe carriage C and thus elevate the front portion of the vehicle which is to be tilted.

It'rwill: be noted that the structure described provides a very responsive finger-tip control .for applying elevating. power yand'rfor releasing the same and simultaneously retaining the winding drum with the carriage at a desired elevated position. In this connection control lever Ly is urged by the spring 2liA to normally engage the .driven element or wheel-2 against the brake. shoe and, when. manually pulled outwardly, simultaneously disengagesthe brake and friction-r ally connects the wheel 20 with theV driving ele ment i8 on the rotary shaft i3..

.Attention is called to. the stable portability of my device. The structurevof the 'base and open-top frameprovided by the 'basev and its twoupstanding posts and the low `center of gravity ofthe shaft IVG; which is connected tothe externalsource of rotary power', as wellf asl the positioning. of the shiftable dri-venelement; all combinatively produce'a highly simplified, eicient device, eliminating the necessity .for overhanging supports-1 and adapted to be easily moved' from place to` place by travel over the ground.

From the foregoing description it willl be seen that I have providedv 'acompact, easily portable4v mechanism particularly adapted for tilting. farm vehicles to facilitate unloading them.

lt will of course be understood that' variouschanges may be made in the form, details, arrangement, and proportions of the various parts' without departing from the scope of the present invention which, generally stated, consists in the matter shown and described Vand set forth in the appended claims.

What Iclaim is:y

1. A hoisting andV tilting device adapted to elevate the wheels VVat one end of a vehicle for tilting the body'V of said vehicle, having in com.- bination an. uprightV SupportV comprising a base and spaced vertical guides rising therefrom., a carriage having its end portions mounted in said guides for vertical. movement, power driven elevating and carriage supporting mechanisml mounted on said support, said carriage providing a. vehicle-wheel-engaging platform .ha-ving. at the longitudinal. edgesthereof upwardly shiftable wheel retaining elements. adapted: when raised. to retain the supported wheels of the vehicle to be tilted, said. retaining elements being shaped toV form short rampsA leading to said platfornr when the carriage is in lowered position, flexible* plied to said flexible elements and to thereafter elevate said carriage.

2. A hoisting and tilting device having in combination an upright supportl having spaced vertical guides, a carriage having its end portions mounted for vertical movement in said guides and adapted to receive, retain, and raise to an.

elevated position the front wheels of a vehicle to be unloaded, said carriage comprising a front tire-engaging and supporting platform, a pair of swingable wheel-retaining wing members pivotally connected to said platform and disposed longitudinally thereof respectively adjacent the.

side portions thereof, a pair of rocker arms ref.y

spectively fixed at the ends of each of said wing members, a pair of toggle arms respectively connected at their lower ends to the rocker armskat each end of said carriage and having their upper end portions pivotally interconnected, stop means for limiting the swinging movement of said'win'g members, a rotary driving element mounted onf said support, a retaining element mounted `in. xed spaced relation to said driving element,

a rotary driven element interposed between said 6 driving element and said iixed retaining element, means for laterally shifting saidv driven element for selectively engaging either said driv- REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Dato 397,243 Mason Feb..5, 1889 833,980 Sester Oct. 23j 1906 1,288,567 Hall Dec. 24, 1918 1,519,357 Campbell Dec. 16. 1924 2,349,91'1 Neighbour et al. May 30, 1944

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