US269776A - cannon - Google Patents

Description

(No Model.)

G. W. CANNON. BRAKE FOB. BLEVATURS 0R DUMB WAITERS.

jPatented Deo. 26, 1882.

[nue/72 Z107?- llista STATES PATENT trice.

BRAKE FOR ELEVATORS OR DUlViB-WAITERS.

SPECIFICATION forming part of Letters vPatent No. 269,776, dated December 26, 1882.

Application filed September 13, 1882. (No model.)

To all ywhom it may concern:

Be it known that l, GEORGE W. CANNON, a citizen ofthe United States, residing at Poughkeepsie, in the county ot' Dutchess and State ot' New York, have invented a new and usef'ul Brake for Elevators or Dumb-Waiters which are operated by an endless rope and wheel, (and for which no patent has been granted in any other country, uor has the same been in use in this or any other country, to the'knowledge of applicant,) ot' which the following is a specification.

Figure l on the drawings represents a seetioual view, and Fig. 2 the manner of hanging` the pulleys P.

illy invention relates to improvements in brakes applicable to dumb-waiters and all ele vators that are operated b v an endless rope and wheel. The object that I attain is the holding ofthe hoisting-wheel rm by a brakelever, which is shown in Fig. 1 of drawings at F. 'Ihis rod or lever is hung upon the pivot L, and is so arranged as to impinge in the groove of t'ne hoisting-wheel A at a point distant about one-sixth the diameter otl the hoisting-wheel from the foot of its perpendicular diameter on the side thereof that enables the brake to resist the descending motion ot' the wheel to best advantage.

The brake F swings on the strong pivotal bolt L, and is forced against the rim ot' -the wheel A by the spring G bearing against the lower arm ot' the brake, and the hoisting-wheel by such application is held firmly in its position, though the waiter or elevator may be overloaded, or I can attain the same action of the brake lever F and dispense with the spring G by attachinga weight to the lower end ofthe leverbrake, thus making its action automatic. I attain this object withoutany additional brakeropo by the arrangements shown iu the accompanying drawings.

Like letters indicate like parts.

For this purpose I place directly below the hoisting-wheel a plank or board as a platform, fastened rmly to the sides of frame ot' the waiter or elevator, sufficiently wide to sustain the mechanism hereinafter described, which hoard is shown at H H in the said drawings. On this platform I place two pulleys, B B, which are about four to six inches in diameter, andwhose grooves are in the same plane as that ofthe hoisting-wheel A, and so placed as to deflect inward the hoisting-ropes by passing inside of them a distance equal to the diameter of the pulleys C O on each side, as shown, Fig. l. The pulleys C C are slightly larger than the others, and have an oblong plate, D, for the back, and the plate P I broken around the pulley and secured to the plate D, and forming on one side a slot for the hoisting-rope and on the other presenting a square face to the ends ofthe levers E E, and these pulleys are hung upon the flange Q, as shown at Q, Fig. 2, at the' point I l, which is located horizontally a little outside of the center of the upper part of the plate D and ilange Q, so as to sustain the weight of the. rope without detiecting the pulleys against the levers E E, and the height ofthe ilange Q and disk D is such as to raise the rope slightly above the horizontal line in passing from beneath the pulleys B B over the pulleys C (l. The pulleys GO are sustained by the bolts I I, on which they swing easily in the plane of the hoisting-rope, and by the bolts J-J, passing through the curved slots K K, so that when they swing inward they impiuge `upon the ends ot' the levers E E E, Fig. l, are levers attached at one end by rivet M M to the brake F above and below the fulcrum of the brake, and operating in ditfereut directions to produce the same motion inthe brake, and at the other ends fast ened to the plank H H by rivets O O passing through the slots N N, so as to permit a horizontal motion ot' the levers when impiuged by the swinging pulleys C C. When there is no force applied to the hoisting-rope R the brake F holds the hoisting-wheel rinly; but when either rope is pulled downward the swinging pulley C is deected inward, and at the point P impinges against and moves-the levers E E and moves the brake out of contact with the hoisting-Wheel, and thereby allows the wheel A to move freely, andthe wheel A will revolve in either direction While such force is applied, and the instant such force ceases the brake is set again by vthe spring G or by the weight on the lower end ot' the lever.

In elevators or dumb-waiters where the hoisting-wheel is made of aseries of armswith V-shaped guards to catch the rope the upper pulleys B B and C G and the levers E E and ro end ofthe brake can be furnished with a slioe the brake F, the spring G, with the hoistinglong enough to impinge upon at least two of wheel A, and endless rope R, all substantially such arms of the wheel. as set forth.

Having thus described my invention and the manner of constructing and operating the saine, what I claim, and desire to secure a patk Yitnesses:

GEORGE V. CANNON.

ent for, is- FREDERICK W. lUGsLEY,

The combination und arrangement of tile MICHAEL J. LAWLOR.

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