US404076A - donohoe - Google Patents

Description

(No Model.) 2 SheetsSheet 1.

H. DONOI-IOE.

v BRAKE FOR DUMB WAITERS. N0. 404,07 Patented May 28, 1889.

WITNESSES: INVENTOR,

Ju A014 A TTOIMIEYS,

N. PErtRs. PholoLithognpher. Washington 0.0

(No Model.) 2 Sheets-Sheet 2.

H. DONOHOE.

BRAKE FOR DUMB WAITERS. No. 404076. Patented May 28, 1889.

WITNESSES: lNI/E/V A TTOR/VEYJ,

UNITED STATES PATENT OFFICE.

I'IUGII DONOHOE, OF NEIV YORK, N. Y.

BRAKE FOR DUMB-WAITERS.

SPECIFICATION forming part of Letters Patent No. 404,076, dated May 28, 1889.

Application filed February 15, 1889. Serial No. 300,012. (No model.)

To ctZZ whom it may concern:

Be it known that I, HUGH DONOHOE, of the city, county, and State of New York, have invented certain new and useful Improvements in Brakes for Dumb-Waiters, of which the following is a full, clear, and exact description.

The invention relates to brake mechanisms for dumb-waiters; and its object is to furnish a simple and reliable device for conveniently and rapidly braking the main pulley carrying the carriage.

The invention consists of certain parts and details and combinations of the same, as will be fully described hereinafter, and then pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a sectional side elevation of the improvement as applied and with parts in section. Fig. 2 is an enlarged plan view of the improvement with the pin in section, and Fig. 3 is a sectional side elevation of the same with parts broken out.

In the dumb-waiter shaft A is held near its upper end the usual frame-work, A, in which is mounted to turn in suitable bearings the shaft B, carrying the carriage-pulley C, over which passes the rope D, supporting the carriage E, mounted to travel vertically in the shaft A on suitable guides and provided with the usual counter-weights to counterbalance the carriage; On the shaft B is also secured a brake-wheel, F, in line with which is held a similarly-shaped wheel, G, secured on a shaft, G, mounted to turn in suitable bearings 011 the frame-work A. The shafts B and G are placed in a horizontal line, as shown, and sufficient space is left between the peripheries of the wheels F and G for the admission of the pin H, provided with a wedge or cone, I, held above the horizontal center of the wheels F and G. The pin H is preferably made of rubber; but other 1naterial-such as iron or wood-will also answer the purpose.

From the top of the Wedge or cone I extends a pin, H, passing loosely through a suitable guide, H held in the shaft A. The lower end of the pin H rests in a socket, J, formed on the free end of a brake-shoe, J, fulcrumed at J 2 to the main frame A. The

brake-shoe J operates against the periphery of the brake-wheel F. The under side of the free end of the brake-shoe J is engaged by the inner end of the lever K,fulerumed at K in the shaft A, and connected at its outer end with a rope, L, extending downward in the front opening of the shaft, as is shown in Fig. 1. The rope L passes in the bottom of the shaft over a pulley, N, and then extends horizontally to pass under a pulley, N, and up over a pulley, N and then hangs down to support a weight, 0, as shown in said Fig. 1. To the outer end of the lever K is also secured one end of a rope, P, which extends upward and passes over a pulley, Q, then extends horizontally and passes over a pulley, Q, from which the rope extends downward and carries a weight, R. The weights R and 0 counterbalance the lever K and the brake-shoe J, and the rope L serves to move the lever K to any desired position.

The operation is as follows: When the brakeshoe J and the lever K are in the position shown in Fig. 1-that is, the brake-shoe J is disengaged from the brake-wheel Fthen the weighted carriage E is locked in place by the wedge or cone I passing against the peripheries of the wheels F and G and preventing a rotary motion of the wheel F. The heavier the weight in the carriage E, the tighter the wedge I will be drawn down between the pulleys F and G. Then the operator desires to lower the carriage E with its contents, he pulls slightly on the rope L, so that the lever K, engaging the free end of the brake-shoe J, causes the latter to swing upward, thereby raising the pin II and disengaging the wedge I from contact with the peripheries of the wheels F and G. The wheel F, the shaft B, and the pulley C are now permitted to turn, so that the rope D, with the carriage E, moves downward. The operator usu. lly has hold of the front of the rope D to lower the carriage at any desired rate of speed. The moment he releases his pull 011 the rope L and lifts the latter to raise the counterbalancing-weight O the brake-shoe J drops downward, so that the pin I'I slides in the same direction and the wedge I again engages the peripheries of the wheels F and G. The wheel is thus again braked.

When the operator hoists the carriage in the usual. manner, the pin II is always ready to drop between the two pulleys F and G whenever the operator releases his hold on the rope, so that the carriage is held in place by pin H engaging the pulleys. llhe operator can apply the brake-shoe J very suddenly whenever he desires bypulling hard on the rope L, so that the inner end of the lever K throws the brake-shoe J in contact with the periphery of the wheel F. The wedge I is then completely disengaged from the wheels F and G, as is plainly shown in Figs. 2 and Thus it will be seen that by a very simple device I am enabled to brake the main shaft carrying the pulley supporting the carriage Whenever desired.

Having thus fully described my invention, I claim as newand desire to secure byLetters Patent 1. The combination, with two aligning wheels, one of which is secured on a shaft to be controlled, of a brake-shoe held below one of said wheels, and a .pin provided with a wedge supported on the free end of the brakeshoe to extend between said wheels, substantiallyas shown and described.

2. In a dumb-waitenthe combination, with a main shaft supporting the carriage-pulley, of a brake-wheel secured on the said shaft, a second wheel held in line with the said brakewheel, a :pinprovided with a wedge and held between thesaid two pulleys, and a brake-shoe supporting the said pin, and a lever operating on the said brake-shoe and under the control of the operator, substantially as shown and described.

4:. In a dumb-waiter, the combination, with a main shaft supporting the carriage-pulley, of a brake-wheel secured on the said shaft, a second wheel held in line with the saidbrakewheel, a-pin provided with a wedge and held between the said two pulleys, a brake-shoe adapted to engage the said brake-wheel and supporting the said ,pin,a lever operating on the said brake-shoe, and weighted ropes connected with the said lever to counterbalance and operate the same, substantially as shown and described.

HUGH DONOHOE.

Witnesses:

THEo. G. HOSTER, C. SEDGWIOK.

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