US436517A - Car-brake - Google Patents

Description

(No Model.)

J. G. ZIMMERMANN. Jr.,

J. J. ZIMMEBMANN &

R. A. STILES.

GAB. BRAKE.

Patented Sept. 16,

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UNITED STATES:

PATENT OFFICE.

JOHN G. ZIMMERMANN, J R, JOHN J. ZIMMERMANN, AND RIVINGTON A.

STILES, OF WEST TROY, NEW YORK.

CAR-BRAKE.

SPECIFICATION forming part of Letters Patent No. 436,517, dated September 16, 1890.

Application filed July 2, 1890. Serial No. 357,541. (No model.)

.To all whom it may concern:

Be it known that we, JOHN G. ZIMMERMANN, J r., JOHN J. ZIMMERMANN, and RIVINGTON A. STILEs, all of West Troy, in the county of Albany and State of New York, have invented new and useful Improvements in Car- Brakes, of which the following is a specification.

Our invention relates to improvements in car-brakes; and the object of our invention is to provide a simple, effective, and reliable mechanism for checking the movement of railway-cars. This object we attain by the mechanism illustrated in the accompanying drawings, which are herein referred to and form part of this specification, and in which- Figure 1 is a longitudinal section of the lower part of a street-car, on the line X X of Fig. 2. Fig. 2 is an inverted plan view of the same. Fig. 3 is an inverted plan view of a modified form of our invention as adapted for applying the brakes at diametrically opposite sides of the same pair of wheels; and Fig. 4. is an inverted plan view of another modified form of our invention.

As represented in the drawings, A designates the bottom of a railway-car; B, the Wheels and axles for same; 0, the brake-beams suspended from the bottom of the car by means of links D, and E brake-shoes attached to said brake-beams and fitted to be moved into contact with the periphery of the car-wheels. All of said parts being old and of a wellknown construction, constitute no part of our invention.

F is a rocker-shaft journaled in hangers G, secured to the bottom of the car andprovided with arms H, which are located near the opposite ends of said shaft, one of said arms projecting from the upper side of said shaft in a radial line, and the other projecting in like manner from the lower side of the shaft F. Between the arms II there is a pair of eccentrics I, secured to the shaft F, and so arranged that the throw of one eccentric will be in a reversed direction in respect to the other. Said eccentrics are provided with the usual eccentric hooks, and each of the latter is provided with an eccentric-rod J, which is preferably provided with a right-and-left nut K, for the purpose of adjusting the length of each of said rods with exactness. Said eccentric-rods lead in opposite directionsone leading toward the forward end of the car and the other toward the rearward endand each is connected by a j oint-piece L to the particular brake-beam O to which it is appropriated. At each end of the car there is a vertical shaft M, provided with a lever, hand-wheel, or other suitable appliance for imparting a rotatory tion to said shaft, and to the lower end of said'shaft an arm N is secured. Each of the latter has a rod 0 jointed thereto, and the opposite end of said rod is jointed to the rockshaft arm H, to which it is especially appropriated.

Our invention operates in the following manner: hen the'brake-shoes E are drawn back from the periphery of the wheels, as

shown in Fig. 1, the brake can be applied by partially rotating the shaft M at either end of the car. Thereby the rock-shaft F will receive a partial rotation, which will move the eccentrics I, so as to draw the brake-beams 0 toward the wheels B, thereby bringing the brake-shoes E into frictional contact with the periphery of the wheels, and thereby preventing the latter from rotating. This prevention will continue during the time that the brakeshoes remain in contact with the periphery of the wheels, and it can only be terminated by turning one of the shafts Min a reverse direction. In this respect our brake operates differently from those commonly used, which are provided with ratchet wheels and pawls for holding the operating-shafts while the brake-shoes are in frictional contact with the wheels, and in which a releasement of the pawl from the teeth of the ratchet-wheel effects the removal of the brake shoes from the wheels.

In the modification of our invention shown in Fig. 3, in which the eccentric-rods J are not connected directly to the brake-beams, and which is especially designed for use on electric or other cars where it is preferred to apply the brake-shoes to opposite sides of the periphery of each wheel, a horizontal lever P is suspended from the bottom of the car over each of the axles, said lever being arranged transversely to the center line of the car. The eccentric-rod J appropriated to operating said foo lever is connected, as at I, to one extremity of said lever, and two links Q are jointed to said lever, so as to extend laterally from opposite sides thereof. The point of connection of one of said links to said lever is at the extremity that is opposite to the one to which the eccentric-rod J is connected, and the other link is connected to said lever at a point that is intermediate between the connection of said eccentric-rod and the first-named link. The latter and the eccentric-rod lead from the same side of said lever, but the other link leads from the opposite side, as shown in the drawings. Two brake-beams O are employedone diametrically opposite to the other in respect to the wheels on which the brake mechanism is to operate-and each is provided with brake-shoes E. The rocker-shaft F and the appurtenances thereto belonging are substantially the same as the like parts shown in Figs. 1 and 2, and they operate in a like manner. On applyinga strain to the lever P by means of the eccentric connected thereto, said lever will be moved to draw the two brakebeams 0 toward the wheels, the pivots of the links Q in said lever operating as fulcrums for said lever, and thereby the wheels will be-irnmovably clamped between the brake.- shoes E.

In the modification shown in Fig. 4, which is designed for use on passengercars and freight-cars which are provided with independent trucks at each end, the brake-shoes E are fitted to bear against the periphery of the truck-wheels, a pair of said shoes bearing at one side of the periphery of one pair of the wheels of a truck, and the other pair of the shoes bearing at the opposite side of the periphery of the other wheels. In this modification the lever P is preferably fulcru med to a hanger S,-secured to the bottom of the under side of the car, and thereby a fixed fulcrum is obtained, so that in case the brakeshoes for one pair of the wheels'become inoperative those for the other pair of wheels will be serviceable for the purpose of arresting the motion of the car; but, when preferred in this modification, the lever P may be suspended from the bottom of the car, as in the other modification; but in such cases said 1e- Ver should be located intermediately between the two axles instead of directly over either.

WVhat we claim as our invention, and desire to secure by Letters Patent, is-

1. In acar-brake, the combination of brakebeams provided with brake-shoes, a rockershaft provided with a pair of eccentrics whose centers are arranged at opposite sides of said shaft, said eccentrics being connected to said brake-beams so as to move the latter relatively in opposite directions, and mechanism whereby a rocking motion can be imparted to said shaft from opposite ends of a car, as and for the purpose herein specified.

2. In a car-brake, the combination of brakebeams provided with brake-shoes, a rockershaft provided with a pair of eccentrics whose centers are arranged at opposite sides of said shaft, horizontal levers arranged adjacently to said brake-beams and connected to said eccentrics and brake-beams, so as to move the latter relatively in opposite directions, and

mechanism whereby a rocking motion can be imparted to said shaft from opposite ends of the car, as and for the purpose specified.

JOHN G. ZIMMERMANN, JR. JOHN J. ZIMMERMANN. RIVINGTON A. STILES.

lVitnesses:

WM. H. Low, S. B. BREWER.

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