US472768A - Elevator - Google Patents

Description

(No Model.)

- A. MOEAGHRAN,

ELEVATOR,

Patented Apr. 12, 1892.

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ANDREW MCEACI-IRAN, OF FITOHBURG, MASSACHUSETTS.

ELEVATOR.

SPECIFICATION forming part of Letters Patent N0. 472,? 68, dated April 12, 1892.

Application filed January 18, 1892- Serial No. 418,399. (No model.)

To all whom it may concern.-

Be it known that I, ANDREW MoEAoHRAN,

of Fitchburg, in the county of Worcester, State of Massachusetts,have invented certain new and useful Improvements in Elevators, of which the following is a description sufficiently full, clear, and exact to enable any person skilled in the art or science to which said invention appertains to make ,and use the same, reference being had to the accompany-v ing drawings, forming part of this specification, in which Figure l is an elevation of an elevator well and car provided with my improvement; Fig. 2, a vertical transverse section of the same, showing the safety-clutch in operation; Fig. 3, a like View showing the clutch mechanism in its normal position; and Fig. 4, a horizontal section of the well, taken above the car.

Like letters of reference indicate corresponding parts in the different figures of the drawings.

My invention relates especially to a safetyclutch lifting mechanism for elevator-cars; and it consists in certain novel features hereinafter fully set forth and claimed, the object being to produce a simpler, cheaper, and more effective device of this character than is now in ordinary use.

The nature and operation of the improvement will be readily understood by all conversant with such matters from the following explanation.

In the drawings, A represents the well, at opposite sides of which vertical ways I) are formed by a partition d. A vertical slot f is formed centrally in each partition cl, opening into the chambers b.

The car B may be of any desired form, and is provided at each side with a vertically-arranged fiange g, which slide in the slots f of the partition d. Above each flange g and in alignment therewith there are spring-supported arms h, which slide in the slots f, the springst'being interposed between said arms and the flanges g and the car-walls being grooved to direct vertical play of said arms. On top of the car there are two vertical lifting-loops j, and through said loops two levers is project loosely, the inner ends on thereof overlapping the vertical center of the car. The lifting-cord O incloses said overlapping lever ends. The levers project through the respective way-slots f, and are fulcrumed at p on the upper end of the spring-supported arms h, which are sharpened to form a bearing therefor. Within the chambers 19 a shoe (1 is pivoted eccentrically on the ends of said levers in position to engage the inner faces of the partitions 01. Outside said chamber a similar shoe r is pivoted eccentrically to each lever in a horizontal plane below that of the pivot of the shoes q. The f ulcru ms p are thus diposed centrally between said pivots.

In the normal position of the parts, the lifting-cord 0 being taut, the weight of the car is supported by the loopsj on the long arm of the levers, said levers being fulcrumed on the arms h on said car and the springs 7; compressed, as shown in Fig. 3. In this position the shoes q r are out of engagement with the partition d and do not interfere with the sliding of the car in either direction. Should the lifting-cord 0 break, the springs 'i, actingexpansively, force the fulcrum-arms h upward, the loops j depressing the long arm of the levers, as shown in Fig. 2. This forces the shoes q 1 into engagement with opposite faces respectively of the partitions d, causing them to grip the same and arrest the downward movement of the car by frictional contact.

As soon as tension is again exerted on the lifting-cord elevating the long arms of the levers the contact of the shoes with the walls d of the partition is broken and the car permitted to slide freely. A single lever 70 may be employed to effect the result described by mounting the loop j centrally of the car and disposing the lifting-cord eccentrically thereof.

It will be understood that a hook or other suitable device may be substituted for the loops j on the car, if desired.

I do not confine myself to mounting the spring-supported fulcrum in alignment with the flanges g, as they may be supported on the ends of flat springs secured to the car-top or in any other suitable manner if adapted to change the position vertically of the fulcrum in relation to the car-body when the strain is relieved on the rope.

Having thus explained my invention, what I claim is- 1. A safety-clutch for elevator-cars, comprising a lever mounted on a spring-pushed fulcrum on the car and projecting through a slot in the carways, two clamping-shoes pivoted-to said lever respectively-at opposite sides of its fulcrum and in position to engage opposite faces of said ways, the shoe-pivots being in different horizontal planes, a liftingrope secured to the innerend of said lever, and a connection between the lever and carbody disposed between said rope and fulcrum, substantially as described.

2. In an elevator, the combination, with the car and well having the slotted ways, of the spring-supported arms fitted to slide on the ANDREW MoEAOI-IRAN.

Witnesses:

ALIoE M. LAMB, OHAs. E. VVARE.

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