US121910A - Improvement in hoisting apparatus - Google Patents

Description

THEODORE T'ERRELL.

Improvement n Hosting Apparatus.

Patented nec. 12,1871.

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, v l) l y UNITED STATES PATENT OFFICE.

THEODORE TERRELL, OF YONKERS, NEW YORK.

IMPROVEMENT IN HOISTING APPARATUS.

Specification forming part of Letters Patent No. 121,910, dated December 12, 1871 To all lwhom it may concern:

Be it known that I, THEoDoRE TERRELL, of Yonkers, in the county of Westchester and State of New York, have invented a new and useful Improvement in Hoisting Apparat-us; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing forming part of this specifica-tion, and in which- Figure 1 represents a partly sectional side elevation of a hoisting-apparatus constructed in accordance with my improvement; Fig. 2, an exterior view, seen at right angles to Fig. l, of one of the uprights or posts of the hoist-way, showing devices by which a governor carried by the platform may be operated 5 Figs. 3 and 4 are sectional views at right angles to each other, upon a larger scale, of the devices by which the governor trips the lifting-rope; and Fig. 5 is a face view of a clutch, whereby the governor is only operated during the descent of the platform.

Similar letters of reference indicate corresponding parts throughout the several iigures of the drawing.

`My invention consists in a combination, with the platform or car, of stops, pawls, or clutches, operated either by springs or weights, or both, for arresting the platform in case of the breakage or derangement of the lifting-rope, when said stops, pawls, or clutches, which bite into or onto racks, rails, or devices up the sides of the hoistway, as in other hoisting apparatus, are arranged in the lower portion of the platform or belovT its base, whereby, in case of the separation of the head of the platform or its breakage, or rupture of the uprights connecting the head with the base, said stops, pawls, or clutches operate to hold the platform or its base, which, under like conditions, they necessarily fail to do when arranged in the head or upper portion of the up rights of the platform. My invention also consists in a novel combination of a governor and tripping mechanism, carried by the platform for tripping t-he lifting-rope if dragging when broken, and so allowing of the stops, pawls, or clutches arresting the platform, said governor preferably only being operated during the descent of the platform.

in its travel. B is the base of the platform B1, its head; and Bz B2, its uprights. C is the lifting-rope, provided with a hook, b, atits lower end for connection with the platform by or through the intervention of stop mechanism or safety devices, that, in case of the lifting-rope breaking or becoming deranged, arrest the platform in its descent; but which are held out of action by the lifting-rope When the latter is not ruptured and is Working perfectly. Stops, pawls, or clutches operating on or in racks or rails of the hoist-way, may be used for such purpose, as in other hoist ing apparatus, and the same be controlled or thrown into action. either by springs or weights, or both. In the drawing, pawls controlled both by springs and weights are shown. It is an important feature, however, of the combination shown in the drawing that said pawls D D are arranged in or under the base B of the platform, so that in case of the head B1 becoming broken or separated or uprights B2 B2 breaking, as not unfrequently occurs, said pawls will as effectually operate to hold the base Where the load is as if there had been no such breakage, and whereby the platform or its uprights and head may be constructed lighter than is usually regarded necessary. The pawls D D are shown as controlled by springs c c and weights d d, the latter operating by means of ropes or chains and pulleys to lift on rods c e connected with the pawls below and with leversff above. These levers fj', which Work on fulcrums intermediate of their length, are connected at their inner ends by a loose or swinging link g with the hook b of the lifting-rope. E E are the ratchets or racks into which the pawls l) D, when liberated, bite to arrest the platform. So long as there is no interruption to the proper suspension of the platform by the lifting-rope the pawls D D are held out of gear with said racks; but, in case of breakage or derangement of the rope, then the springs c c and weights d d throw the pawls into lock with the racks, as readily understood by those acquainted with other hoisting apparatus carrying stop or safety mechanism. F is a governor, carried by the platform and set in motion during the travel or descent of the platform by any suitable mechanism; as, for instance, by a pinion, h, Working in a rack, i, on one of the iixed uprights A, said pinion setting in motion a shaft, 7c, thathas its bearings in the platform, and which may either he eonneeted directly with the hevel- ,l Lear m n that aetnates the governor, or indirect ly as by intermediate gear for speeding' up the governor. In either case, however, it is desira ble that while the pinion la is rotated in both the upanddown travel oftheplatform.motion should only be communicated to the g1rvernorduringg; the descent of the platform, as it is only durilr;v such lattertlarel that the governorrequires to be called into action. This may he done by arranging; on the shaft a ratchet or other eluteh, o, which will cause motion tobe conveyed to the governor only duringl the rotation of the pinion Iz in its one direction-that is, as the platform descends. The object of this eovernor F is to trip the liftinga'ope in ease ot' the latter dragging', as is not unlikely to happen when said rope breaks at or near the hoisting-drum and when it is of considsiderable length. Any draggingot the rope unY der these eirenmstanees interferes with or prevents the action ofthe safetystops or pawls. To obviate this the governor F, it' commencing to run at a more than ordinary speed in thedeseent of the platform, immediately lifts on a level', r, which trips the link q from ott' the hook b, and so clears the platform of connection with the lift ing-rope.

What is here claimed, and desired to he secured by Letters latent. is-

1. The combination, with the ear or traveling platform, of pawls or stops controlled by springs or weights, or botli,when said stops are arranged in the base of said platform substantially as specilied.

L. The combination ofthe pawls D D and springs r e or weights (l (l, or both, with the rods e e and levers fj', with which the liftingrope C connects, when said devices are arranged in relation with the base B and head Bl of the car or traveling platform, essentially as described.

J5. The combination, substantially as herein described, with the car or traveling-platform of a hoisting apparatus, of a governor attached to and carried by said car or platform, and deriving motion through the descent thereof, and a tripping device forming;` a connection between the hoistingrope and the stop mechanism applied to the ear or platform, said governor operating', as herein set forth, on said tripping device to release the stop mechanism from the rope.

4. The combination ot' the governor l and its lever r with the link g, the lifting-rope hook I), the leversj'j', the rods e e, and the pawls D D, substantially as speciied.

THEODORE TERRELL.

Vvvitnesses:

SAMUEL L. NVHALEY,

RAJfFAnLLE COBB. (49)

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