US154221A - Improvement in elevators - Google Patents

Description

J. B CHYNDWET-H.

Elevators.

NOII5422I, Patented Aug.181,1874.

UNITED STATES PATENT OFFICE.

JAMES B. CHYNOWETH, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN ELEVATORS.

Specification forming part of Letters Patent No. 154,221, dated August 18, 1.874; application filed August 1, 1874.

To all whom zt may concern Be it known that I, J AMES B. CHYNOWETH, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Elevators and I do hereby declare that the following is a full, clear, and exact description thereof, which will 'enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings and to the letters of reference marked thereon, which form a part of this specification.

My invention relates to hand-elevators for stores, &c., dumb-waiters, or other hoisting apparatus; and it consists in the combination, with the car, rope, or cable, and counterpoise-weight; of a series of pulleys constructed with grooves to receive the rope or cable, and

thcir'faces impinging against each other. It also consists in the construction of a brake mechanism, all of which will be hereinafter more fully set forth.

In the accompanying drawing, Figure 1 is a longitudinal vertical section of a hand elevator embodying my invention. Fig. 2 is a side view of the large wheel with the brake mechanism. Fig. 3 is a side view of one of the series of pulleys used.

A represents the frame-work of a hand-elevator or other similar device. B represents the large wheel for the hand-rope C. On the shaft of the wheel B is 4secured a pinion, a, which gears with a cog-wheel, D. Upon 4the same shaft as this cog-wheel is secured a pulley, G, around which the rope or cable b passes, one end of said rope being secured to the car E, and the other end passes over two other pulleys, G1 and G2, and has the counterpoise-weightH attached to it. The pulleys G G1 G2 are made of wood, paper, or iron, of uniform size, and are grooved on their v,faces to receive a little less than one-half the diameter of the rope b, causing said rope or cable to be firmly held in the grooves, while is a great adhesion of the cable to the pulleys. The use of drums having several turns of the cable have partially overcome this difficulty; but therwinding and unwinding of the cable causes it to be continually deviating from the perpendicular, causing a large amount of friction both on the car and counterpoise-weight, which is veryY objectionable.

These difficulties are entirely obviated byV my invention, as I obtain a sufcient amount of traction to the cable to prevent slipping, and also preserve the perpendicular position of the cable.

This part of my invention is also applicable wherever power is transmitted by wire cables to prevent the loss of motion.

' On the outer side of the wheel B is a circular flange, d, concentric with the Wheel and its shaft. To the frame A are pivoted two segments, h h, which are'cam-shaped on their inner sides, as shown in Fig. 2. J represents a lever placed upon the shaft of the wheel B, and provided with two projections, z' c', which extend within the cam-shaped segments h h. One end of this lever J is weighted and suspended by a cord, m, which prevents that end of the lever from falling down more than what is suicient to release the segments h from contact with the flan ge d. To the other end of the lever is attached a rope, n. By pulling this rope the projections i t' spread the segments h h and force them against the inner surface of the ilange el, thereby regulating the motion of the wheel B during the descent of the car. To the weighted end of the lever is "attached a rack-bar or block, p, into v car E, rope or cable b, and weight H, of a series of pulleys, G Gl G2, constructed, as described, with grooves to receive the rope, and their faces impinging against each other, substantially as and for the purposes herein set forth.`

2. The lever J, Withprojcetons i and segments h, in combination with circular ange d; Wheel B, and cords m and n, all constructed A as and for the purpose set forth.

3. The ratchet-block p, pawl s, and brakelever J in combination with cords m and n, projections i, segments h, Bange d, and wheel B, all as and for the purpose herein described.

In testimony that I claim the foregoing as my own I alfx my signature in presence of two Witnesses.

JAMES B. GHYNOWETH.

Witnesses:

CHAs. H. MITCHELL, C. O. THOMPSON.

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