US302150A - Gar-brake - Google Patents

Description

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CAR BRAKE. 1

No. 302,150. Patented Jul 15 1884.

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GAR BRAKE.

Patented Jul 15, 1884.

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THOMAS L. MOKEEN, OF EASTON, PENNSYLVANIA.

,CAR-BRAKEL SPECIFICATION forming part of Letters Patent No. 302,150, dated July 1884.

Application filed May 7, 1884, (No model.)

To all whom, it may concern.-

Be it known that I, THOMAS -L. McKEEN,a citizen of the United States, and a resident of Easton, in the county of Northampton and Stateof Pennsylvania, have invented certain,

new and useful Improvements in Brakes for Railway-0ars; and Ido hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains 'tornake and use the same, reference being had to the accompanying drawings, which form apart of this specification, and in which-- Figurel is a side view of as much of a railway-car as will show my improved brake-operating mechanism, the wheels on one side be ing broken. away. Fig. 2 is a bottom view of the same. Fig. 3 is a detail view of the sleeve upon the axle and a portion of the axle.

Fig. 4. is a view of the spring upon the brakechain. Fig.5 is a view of a modification of thefriction-pulley, and Figs. 6 and 7 are views of modifications of the means for forcing the outer end of the pulley-bearing lever down.

Similar'letters of reference indicate corresponding parts in all the figures.

My invention has relation to that class of brake-operating mechanisms in which a friction-pulley is brought to bear against and to revolve with the axle of the car, winding the brake-chain; and it consists in the improved construction and combination of parts of the same, as hereinafter more fully described and claimed.

In the accompanying drawings the letter A indicates the axle, which is provided with a sleeve, B, composed of two halves secured together bymeans of screw-bolts O, passing through perforated lips D at the ends of the sleeve, causing the two halves to clamp the axle. A lever, E, is pivoted at or near its middle under the. car, rocking in a vertical plane, and its inner end is bifurcated, as shown at F, and two pulleys, G G, connected with the chain from breaking.

brake-chain and the brakes, when the pulleys pressed by a steep-threaded screw, J, turn- I ing in a threaded perforation in the car-platform, provided with a hand-wheel at its upper end, and bearing against the outer end of thelever with its lower end, or the lever may be depressed, as shown in Figs. 6 and 7, by a vertically-sliding rod, K, pivoted at its lower end to the lever, and pivoted at its upper end to a lever, L, pivoted upon an upright upon .the platformof the car, or by a verticallysliding rod, M, pivoted to the lever at its lower end, and provided at its upper end with aplate or treadle, N.

Forthe purpose of preventing the brakechain from drawing too hard upon the brakes 5 if the friction-pulleys continue to wind the said chain, the end of the chain is attached to a yoke, 0, connecting the ends of two parallel rods P, projecting from the ends of a yoke or plate, Q, having aperforation or bearing at its middle, and a yoke, R, having perforations S at its ends, slides upon the rods, and has the end of a rod, T, sliding in the central bearing of the yoke upon the ends of the parallel rods secured to its middle, and a spring, U, is wrapped;around the end of this sliding rod, bearing with its ends against the stationary and the sliding yoke. This spiral spring is sufficiently strong to allow the chain to operate the brakes without yielding; but if the strain should for any reason become too hard the spring will yield, and thus prevent The same result may be accomplished by allowing the frictionpulleys to turn loosely upon their shaft, and

attachinga strong helical spring, V, with one end to the shaft and with the other end to the pulley, and this spring is sufficiently strong toallow the friction-pulleys to turn their shaft and wind the brake-chain,-while it will yield if a too great strain is made upon the chain.

Having thus described my invention, I claim and desire to secure by Letters Eatent of the United States:

The combination of the car-axle having the friction-sleeve, the lever pivoted under the of the lever, as and for the purpose shown 10 car to rock in a vertical plane, the frietionand set forth.

pulleysjonrnaled between the bifurcated in- In testimony that I claim the foregoing as ner ends of the lever and connected by ashai't my own I have hereunto al'lixed my signature 5 between them, the brake-chain secured to the in presence of'two witnesses.

said shaft, and a screw having steep threads THOMAS L. MUKEEN. provided with a handwvheel at its upper end, i \Vitnesses:

turning in a threaded perforation in the ear- I S. L. FISHER, platform, and bearing against the outer end \VM. H. IIULIeK.

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