US279243A - Assigedb of two-thieds to pldsty - Google Patents

Description

(No Model.)

T. HILL.

POWER ELEVATOR. o. 279,243. Patented June 12,1883

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- 1 UNITED STATES.

PATENT OFFICE.

THOMAS HILL, OF QUIN CY, ILLINOIS, ASSIGNOR OF TVVO-THIRDS TO PLINY B. WILLIAMS AND CEYLON SMITH, OF SAME PLACE.

POWER-ELEVATO R.

SPECIFICATION forming part of Letters Patent No. 279,243, dated June 12, 1883.

- Application filed November 29, 1882. (N model.)

act description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and

to letters of reference marked thereon, which form a part of this specification.

The object of my invention is to prevent accidents caused by the unwinding of an elevator-rope on the drum when the truck or cage is accidentally retarded or stopped in its descent. This I accomplish by utilizing the slack of the rope to operate a weighted roller press.

ing against it, which, through the medium of the mechanism hereinafter described, reverses the motion of the drum or stops it.

In the drawings, Figure 1 is a side elevation. Fig. 2 is an end view. v

A represents the elevator rope or cable, one end of which is fixed to the elevator truck or cage, and the other is wound around the drum A, which is fast on the shaft B. This drum- ,shaft B is journaled in a hanger at one end and in the case B at the other end, which extends through and beyond said case.

Fast 011 the shaft B, withinthe case, is a worm-wheel, b, which is engaged and driven by a worm, c, on the counter-shaft (3, having bearings in hangers c c, and in a suitable formation depending from the case B.

On the shaft 0, between the hangers c, are the. pulleys 1, 2, and 3, the central pulley, 2, being tight on the shaft, and pulleys 1 and 3 being engaged by belts having contrary mo tions, so that when the belts are shifted the one engaging pulley 1 and the one engaging pulley 3 will alternately engage the tight'pulley, thus unwinding or winding the rope on the drum at the will of the operator, 'or automatically, in the manner hereinafter set forth.

Loose on the end of the shaft B is the lever D, composed of two arms extending in oppo-.

site directions from the sameboss, the upperof which is shorter ,and is set farther back than the lower arm. Pivoted and, when in its first position, projecting at right angles to the end of the upper arm is the pawl d, provided with a tooth, d, to engage the corresponding teeth of the ratchet-wheel E, which is fast on the drum-shaft B, between the lever D and case B, immediately under said pawl. Pawl d is provided with a laterally-projecting finger, e, which is engaged by the arm F. This arm is rigidly fastened tothe end of the rock -shaft H, and is adapted to automatically lift the pawl d and disengage the ratchet E, ordrop the same and engage said ratchet, according to the oscillations of the rock-shaft. This rock-shaft is j ournaled in suitable bearings, h, and is parallel to and a little above the plane of the shaft B. WVithin the bearings h on the rock-shaft are the arms k, which have suitable bearings in or near their extremities for the weighted roller L. These arms areinclined toward the rope A, against which the weighted roller bears. Thus it will be ob served that when, from any cause whatever, the rope A becomes slack-for instance, when the elevator truck or cage catches or is retarded in its descentand the rope becomes slack-the weighted roller bearing against it falls to the position shown in dotted lines in Fig. 1, thus oscillating the rock-shaft and dropping the arm F, taking away the support it furnished to the pawl d, which drops upon and engages the ratchet. The ratchet carries the pawl forward a short distance sufficient to oscillate the lever D. The lever D has a stud projecting laterally from its lower end, which passes through the slot 8 in the link P, the

other end of which is pivoted to the shiftingh bar 1), which reciprocates in suitable guides projecting from the hangers c c, and is provided with two yokes, as shown, through which the belts driving the adjacent pulleys pass.

The length of the slot 8 corresponds to the extreme end of the slot, as at r, so that the instant the rope slacks the belts will be shifted one-half the throw of the shifter-bar, so that both belts will be upon the loose pulleys 1 and 3, thus stopping the machine, or be shifted the entire throw of the shifter-bar from pul leys 1 and 2 to 2 and 3, thus reversing the motion of the same.

What I claim as new, and wish to secure by Letters Patent, is

1. The combination, with an elevator-rope, A, of an actuating device for stopping or reversing the motion of the drum upon which said rope is wound whenever said rope is slack, consisting ofa weighted roller journaled in arms k, a rock-shaft, H, from which said arms extend, and an arm, F, on the end thereof for transmitting the motion of said rock-shaftto the rest of the mechanism.

2. The combination of the arm F, operated as hereinbefore described, with the pawl d, pro- -vided with a lateral finger, e, the lever D, and

the ratchet 'E, as and for the purpose set forth.

3. The link I, pivoted to a belt-shifting device, having a slot long enough to allow the 25 belt-shifter to move the belts from pulleys 1 and 2 to 2 and 3. without moving the lever D, as hereinbefore specified.

4. The combination, with the drum,weighted roller, arm, lever, pawl, and ratchet, of a belt- 0 shifting device, substantially as described, connected to the lower end of said lever by a link, in the manner and for the purpose hereinbefore set forth.

In testimony that I claim the foregoing as 3 5 my own I hereunto affix my signature in presence of witnesses.

THOMAS HILL.

Witnesses:

JAMES H. OoYNE, FRANK THOMASON,

J. O. HARTLEY, CHAS. H. BAGBY.

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