US657815A - Hoist. - Google Patents

Description

Patented sept. n; |900.

W. T. EADES & E. ALLDAY.

HOIST.

(Application filed May 3, 1900.)

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(No Model.)

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No. 657,8I5. Patvented Sept. ll, |900. W. T. EADES &. E. ALLDAY.

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(Application filed Muy 3, 1900.)

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TTnn STATES PATENT OFFICE.

WILLIAM THOMAS EADES AND EDMUND ALLDAY, OF SMALL HEATH, NEAR BIRMINGHAM, ENGLAND.

HOIST.

SPECIFICATION forming part of Letters Patent No. 657,815, dated September 11, 1900.

Application filed May 3, 1900.

f To @ZZ whom it' may concern:

Be it known that we, WILLIAM THOMAS EADns and EDMUND ALLDAY, manufactu rers, subjects of the Queen of Great Britain, residing at Sydenham road, Small Heath, near the city of Birmingham, England, have invented certain new and useful Improvements in Hoists, of which the following is a specication. v

This invention relates to hoists or lifts principally for use in Warehouses and the like, and has for its object to construct a lift or hoist adapted to raise various loads at different speeds and provided with automatic lowering-gear and also with an automatic brake by which the hoist is made to efficiently sustain its load at all speeds of lifting.

Figure l of the accompanying drawings represents a side elevation of a self-sustaining Warehouse-hoist designed for lifting varied loads and having an automatic brake in accordance with one form of our invention. This apparatus is designed to lift at three different speeds, (or two speeds beyond the ordinary speed,) according to the weight of the load to be raised.-viz., a slow speed for heavy loads, an intermediate speed (about four times faster than the slow speed) for raising moderate loads, and a high speed for dealing with light loads, which are lifted at a rate about eight times faster than is obtained with the slow-speed gear. This View clearly shows the arrangement of the brake, the automatic means for sustaining the load, and the means for disengaging the brake to permit of automatic running down or lowering. Fig. 2 represents an end elevation of the said hoist; and Fig. 3 represents a transverse vertical section of the same upon the dotted lines 5c, Fig. l.

The same letters of reference indicate corresponding parts in the figures.

According to this form of the invention the axle or shaft a of the hoist-or lift is supported at one end ct in an open-topped bearing b', carried by the fixed framing b of the hoist, while the other end a2 has mounted loosely upon it a brake-wheel c, having a central boss c', whose sleeved extension c2 lies within an open-topped bearing b2, located on the opposite side of the fixed framing and constituting the second support for the said axle,

Serial No. 15,394. (No model.)

which is capable of rotating in either direction.

The periphery of the brake-drum normally has a bearing upon the inside of a friction brake band or sling (l, suspended at its ends from hanger-brackets d4', secured to the side framings, while this end a2 of the shaft and the whole of the parts of the hoist carried by it are capable of being bodily lifted, so as to take the periphery of the wheel out of contact with the braking-band by means of a long lever e, pivoted at e' to a separate bracket e2 on the side framing, with its short arm coming underneath the extending end part c3 of the said shaft e3, while the longer arm is provided with a pull-cord e4. Loosely mounted upon a part of the shaft immediately inward of the brake-drum is a smallload wheel or slow-speed pulley f for heavyweight lifting,having arranged in conjunction jwith itafriction-clutch g, ofthe rolleror other type, located within the recessed boss of the :brake-wheel and adapted to act in such a manner as to permit of the rotation of the said pulley in one direction, (for lifting,) but to render it incapable of rotation independent of the said brake-wheel in the other direction, so that when the pulley is clutched to the brake-wheel no running down of the load being lifted by the slow-speed pulley can occur. Also loosely mounted upon the said shaft, but adjacent to the bearing b', is i another and larger pulley or intermediatespeed load-wheel h for quickly raising moderate loads provided with an integral or attached ratchet-Wheel t', Whose teeth are engaged by a pawl t', carried on the framing and actingin such a manner as will permit of its pulleyrotating for lifting in an opposite direction to that in which the smaller vpulley turns for lifting, but .will prevent it running down in the other direction by coupling it to the frame of the hoist. Either the :one or the other of these lifting-pulleys,which are confined against outward movement by 4stop-collars f h', keyed upon the shaft, is actuated by means of a hand-wheelj, operated by an endless rope or chain j' and travgersed along the shaft7 so as to come into operative frictional contact with the opposed face of either pulley by means of a screw or IOO helix a5 on the said shaft and a screw-boxj2, formed in the boss of Ithe said hand-wheel, which is rotated and traversed either to the right or to the left, according to which pulley is to be thrown into gear. An endless chain k passes over both the load-pulleys, with one of the loops k thereof directed around the sheave of the hooked block k2.

Operation: Assuming that a moderate load is required to be lifted at the intermediatev speed, the endless rope passing around the hand-wheel is pulled at the side marked A in Figs. l and 2, and the said hand-wheel is thereby rotated in the direction indicated by the full arrow in Fig. l and is at the same time made to traverse from right to left along its shaft through the medium of the helix a5 and screw-box j?, and thus the said handwheel and the pulley h are clutched together by the friction exerted between their opposed faces and are made to rotate in unison for raising the load, the said load being meanwhile sustained and the running back of the we desire to claim and secure by Letters Patsaid pulley h Vbeing prevented by the pawl t" engaging one of the teeth of the ratchet-wheel t', while the turning backward of the slowy centrally with a helix, a hand-wheel mounted on the helix of the shaft, and a loadpulley loosely mounted upon said shaft at each side l of said wheel and adapted to be operated by frictional engagement with said wheel.

Then as the rotation of the hand-wheel andL i pulley h in the aforesaid direction proceeds- J on the helix of the shaft, a pair of load-pulleys suitably arranged upon said shaft and i adapted to be operated by the frictional enspeed pulleyf is at the same time prevented by the pull exerted by the weight of the load upon the side of the chain marked o in Fig. 1, actuating the clutch g, by which the said pulley f is coupled to the brake-wheel.

the load is lifted by the chain passing over the said pulley at a speed four times faster than would be obtained by the small pulley or at any other desired speed, according to the diameter of the pulley over which the chain passes. Assuming now that the hoist is required to lift a heavy weight at a slow speed, the endless rope is pulled at the side wheel in the reverse direction, as indicated by the dotted arrow, when the hand-wheel is disconnected from the large-load pulley and traversed by the screw on the shaft from left to right along the said shaft into operative connection with the sm all-load pulley f, which is thereby liberated from the brake-drum and rotated with the hand-wheel for lifting the load which is sustained during the hoisting operation by the clutch g, preventing the running back of the small-load pulley, and by the pawl t" and ratchet-wheel t', holding the large-load wheel stationary in opposition to the pull exerted upon it by the load and chain. The lifting of very light loads at the less chain la at the side marked C in Fig. l, when the load is lifted at a speed proportionate to the diameter of the large-load wheel, which acts as a simple pulley, thel running back of the load being prevented, as before, by the clutch g and brake-wheel and the pawl t" and ratchet 't'. To permit of the running down of the load, the endless rope is pulled at B, if necessary, to disengage the handwheel from the small-load pulley, and then the brake-release cord e is pulled down, when the lever e is turned, and its short arm lifts the adjacent end of the axle out of its bearingand takes the periphery of the brakewheel more or less out. of contact with the Abrake-band, when the brake-wheel and pulley rotate together around the axle and the load is run down, lout is under control, and the speed of running down is regulated b v the attendant releasing the brake-cord e4 when necessary and allowing the brake to act. The large pulley is kept stationary during the descent of the load by the pawl-andratchet arrangement.

In some instances instead of obtaining the varying lifting speeds (according to the weights to be raised) by the employment of load-pulleys of different diameters, as in the last-described arrangement, the same result may be obtained by differential-toothed gearing.

Having fully described our invention, what ent is l. In a hoisting device, a shaft provided 2. In a hoisting device, a shaft provided centrally with a helix, a hand-wheel mounted gagement therewith of the said wheel, a brakl ing means suitably connected to one of said pulleys, a ratchet-wheel carried by the other l of said pulleys, and a pawl adapted to engage said ratchet-wheel. marked B in Fig. l, so as to rotate the handi 3. In a hoisting device, a pair of load-pul- 1 leys of different diameters suitably mounted upon a shaft, a hand-wheel adapted to frici tionally engage said pulleys for operating the v same, an endless cable for operating said hand-wheel in either direction, a brake-wheel l resting upon a braking expedient, a frictionl clutch adapted tobe broughtinto engagement vwith one of sadpulleys by means of said y brake-wheel, means for releasing said brakewheel to permit of the running down of said pulley, a pawl-and-ratchet means connected to the other of said pulleys to prevent the running down thereof, and an endless chain operating over the said pulleys, substantially as described.

highest speed is effected by pulling the endl 4. In a hoisting device, a pair of load-pulleys of different diameters suitably mounted upon a shaft, a` hand-wheel adapted to frictional-ly engage said pulleys for operating the same, a brake-wheel resting upon a braking expedient, a friction-clutch adapted to be brought into engagement with one of said pulleys by means of said brake-wheel, means for releasing the said brake-wheel to perm-it the running` down of said pulley which is IOO IIO

adapted to be connected thereto, and :t pawland-ratchet means connected to the other of snid pulleys and adapted to prevent the running down of the same.

5. In a hoisting device, a shaft journaled at each end in open-topped bearings, a loadpnlley mounted thereon, operating means therefor, a brake-Wheel resting upon a, braking expedient, a clutch adapted to connect said brake-Wheeland said pulley and a lever adapted to engage and elevate one end of said shaft forreletsing said brake-Wheel from the braking expedient.

6. In u hoisting` device, a shaft provided centrally with a helix, a hand-Wheel mounted upon the helix, a load-pulley carried by said shaft at each side of the wheel and adapted to be operated by frictional engagement with said wheel, a paWl-and-ratohet means for preventing the running down of said pulleys, a braking means for preventing the running down of the other of said pulleys, and a lever adapted to engage said shaft to release i said braking means.

In testimony whereof We have hereunto set our hands in presence of tWo subscribing Witnesses.

WILLAM THOMAS EADES. EDMUND ALLDAY. Witnesses:

HY. SKERRETT, ARTHUR T. SADLER.

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