US68794A - Improvement in hoisting apparatus - Google Patents

Description

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'Be it known that I, WILLIAM Rune, of the city, county, and State of New York, have inventeda new and improved Hoisting Apparatus; and I do hereby declare thatl the following is a full, clear, and exact description thereof, which will enable others skilled in the art'to make and use the same, reference being had to the aecompanying drawings, forming part of this specification, in which- Figure 1 represents an inverted plan view of:4 my improved hoisting apparatus.

Figure 2 is a side view of the same partly in section, the plane of section being indicated by the linezz, fig. 1.

Similar letters of reference indicatev` corresponding parts.

This invention relates to a hoisting apparatusin which by an endless chain motion is imparted to a shaft en which an endless screw is arranged which meshes into a worm-wheel that is mounted on another shaft, The latter is'conneeted by differential gearing with two shafts, on which the drumsl over which the endless hoisting chain passes are mounted. l One of the drum-shaftscan be easily thrown out of gear for the purpose of lower- -i-ng the hook pulley which slides in the lower part of thehoisting chain. The four shafts are hung in a casing which is suspended from a stationary frame, and which is provided with suitable. lids for giving access to the shafts for lubricating-and cleaning purposes, Provision is made that the hoisting `chain cannot slip'on or get off the drum. i l i A represents acuse or box, made of sheet metal or other suitable marial, open at the under side, and closed on top to keep the dust out. The central portion a of the cover is fixed between -the side pieces b of the case, while the ends c andl d of the cover are hinged to the centre a, their swinging ends resting upon the end pieces e andf of the ease, respectively. To the top of the stationary cover ais secured a swivel hook, B, by whichv the case can be suspended from .a stationary frame or beam. G is a shaft, which has its bearings in the end piecef, and in a plate, g, which is suspended' from the cover a. On itsouter end is mounted alarge pulley, h, while its inner end is provided with an endless screw, ,as is clearly shown the drawing. D, E, and F are three horizontal shafts, which have their bearings in the side pieces b b of the case, and which are arranged on the same level with each other, as is clearly shown in fig. 2. The shaft E is in the centre between D andF, whichare equally distant from it. A worm-wheel, j,is mounted on the shaft E, and meshes into the worm z. On each end of the shaft E is mounted a pinion, 7c, as is clearly shown in fig. 2. Thesepinions mesh into gear-wheels l and m that arev arranged on theshsfts D and F, respectively. Motion is thus transmitted to the shafts D and F from the shaft C by means of an endless chain, G, 'which passes over the pulley h. The trans'- tnission is such that with little power applied to the shaft G, greatpowcr will be imparted to the shafts D and F, so that heavy weights can be elevated with the-application of but a small amount of muscular power.' H is an endless hoisting chain, which is laid over two pulleys n and o, whichare mounted on the shafts D andF, respect` ively. This-chain is so arranged that two loops hang down from the case A, in one of which the hook pulley isarranged. The pulleys n and o have anges which are notched or recessed to receive and hold' the links of the chain H to prevent the same from slipping. By turning the shaft C from-left to right, the shafts D and F will be revolved in the direction of the arrows shown in g. 2, thereby drawing the ends of that loop in which the hook pulley is arranged up, and elevating the weight that may be suspended from the latter. The thread of'the screw z' is arranged so little inclined that when the parts are left unmoved the weight on the hook pulley will not be able to draw the loop of the chain in which it is arranged down again, the` flanges -of the screwz acting as effectual brakes to prevent the shaft E, and with it the shafts D and F, from turning. The pulleyh is also like the pulleys n and o, to prevent the chain G from slipping. The gear-wheel Z on the shaft D ismade so as to slide on vthe shaft, and is connected with a clutch, p, and lever g, the latter being pivoted to` the end strip c. By this means thewhecl lean be thrown out of gear, whereby the shaft D is allowed to turn ,indepene dent of the other shafts.A Thus when' the shaft D is thrown out of gear, the hook pulley canbe easily andV quickly lowered, by drawing it down, so that the chain H will be drawn over the pulley on D, its other side p being held fixed on the shaft F. r r are Z-shapedarms, which aie secured to the case A, andere made tort around the rim of the pulley lz'to prevent the chain from running out of the groove. The pulleys n and o are protected in a similar manner by arms s s. Thepeculiur mode of drawing the chain H over the pulleys n and o, so that both ends of the loop inA whichthe hook pulley hangs, are drawn `up at the same time, gives a greater -steadiness to the weight hoisted. L L are four (more or less) plates orflugs, projecting from the sides of the case A, and serve to support the latter when the same is not to be suspended. Boltsmay be arranged through these plates L, whereby the device may be secured on a suit-able bed of suiicient strength. rIhis arrangement- `will be of special value for elevating very heavy weights.'

Having thus described my invention, what I` claim as new, and desire to secure by Letters Patent, is-

1. Soarranging theA hoisting chain andthe device for operating it, that two loops are suspended from the latter, in one of .which the hook-pulleyis arranged, the arms of this loop being laid over'pulleys on two shafts D and F, which are both revolved with exactly equal velocity and in the same direction, as set forth.

2. The Worm z' and vworm-wheel j, in combination with the shafts D, E, and F, and gear-wheels c,-Z, and m, all made and operating substantially as herein shown and described. i Y

-' 3. Providing the case A with folding lids o and d, substantially as and for the purpose herein shown and described'. l

' 4. The guards r and a, in combination with the grooved pulleys z and'nl o, respectively, for the purposes herein shownv and described.

5. The projecting lugs L L, when arranged on the'vcase A of ahoisting apparatus, substantially as and for tbs*- purposes herein shown and described.

' WILLIAM- RUN G.

Witnesses:

WM. F, MCNAMARA, ALEX. F. ROBERTS.

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