US117841A - Improvement in steam-power air-brake devices - Google Patents

Description

` GEORGE WESTINGHOUSE, Jr.

Steam-Power Air-Brake Devics.

Patentgd August 8, 1871.

SHQ. 3.

UNITED STATES PATENT @Frio/n1.

GEORGE VVESTINGHOUSE, JR., OF PITTSBURG, PENNSYLVANIA.

IMPROVEMENT IN STEAM-POWER AIR-BRAKE DEVICES.

Specification forming part of Letters Patent No. 117,841, dated August 8, 1871.

ATo all whomy it may concern.-

Be it known that I, GEORGE VnsTINGHoUsE, J r., of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Steam-Power Air-Brake Devices 5 and I do hereby decla-re the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawing making a part of this specification, in which- Figure 1 is a plan view of an inverted half of a railway car illustrative of my improvement. Fig. 2 is an enlarged detached view of the car ends, more particularly illustrative of the double coupling arrangement; and Fig. 3 is a detached view of the form of lever, shown in Fig. I, ar ranged with a spring for more perfectly and eX- peditiously causing the brake-shoes to clear the wheels when the brakes are let off.

Like letters of reference indicate like parts in each. Y

The present invention relates more particularly to an improvement on the invention secured to me by Letters Patent of the United States, dated April I3, 1869; and consistsin an improved construction and combination of devices for operating the brakes by the power of compressed air, .substantially as hereinafter described and claimed. A

To enable others skilled in the art to make and use my invention, I will proceed to describe its contruction and operation.

rThe frame-work A A of the car, thewheelsB, brake-bars b', rubbers or shoes 1),'and truck-frame B', are of the usual or any known construction. Power is communicated to the brakes by any suitable arrangement of rods a and levers a. The brake-cylin der D receives compressed air by the air-pipe d, and power is communicated from it by a piston-stem, in the manner described in the patent hereinbefore mentioned. Connection is made from the piston-stein to the rod c by means of a hollow sleeve, D, which permits the rod c to play back and forth, when the brakes are being operated by hand, without destroying the power connection. A connecting-rod, c, leads forward to the brake-lever, as shown.

In applying car-brakes it is desirable that the movement of the brakeshoes at first be rapid, so that they shall engage the wheels as quickly as possible, and after they have enga-ged the wheels that they be pressed against them with great force. Before they touch the wheels they o'er no great resistance. After they engage the wheels their motion is little, but the resistance is great. Now, in order to apply the power rapidly at first, while the resistance is small, and with greater force afterward when the shoes engage the wheels, I introduce between the rods c c the ordinary form of bent lever e e', or make it triangular in shape, as shown, by connecting the outer ends of the longer and shorter arms. This lever is pivoted to the car at the junction ofthe arms e e. The connectingrod o that leads to the brake-lever is pivoted to the outer end of thelon ger arm e and the rod c leading from the pistonstem in the sleeve D is pivoted to the outer end of the shorter arm e. It will now be obvious tha-t the power acting on the end of the shorter arm e will, at first, give a rapid throw to the rod c and cause the brake-shoes to approach the wheels rapidly; and that, as the rods e e come into line and the brake-shoes engage the wheels, the power will be applied more slowly, (the leverage being lessened,) but with greater effect.

It is also important, in the operation of carbrakes, that, when released, they clear the wheels quickly and entirely. To secure this I connect a spring, j', of any suitable form, (but preferably a spiral, as shown,) with the longer arm e, substantially in the manner shown in Fig. 3. During the first part ofthe outward thrust of the rod e the spring, while being compressed, comes gradually into line with its own pivotingpoint j" and the pivoting-pointj" of the bent lever; and the power expended in compressing it lessens at the very timewhen the maximum of power is required ou the brake-shoes. When the bra-kes are let oft' the shoes partially clear themselves at once from the wheels. The object of the spring fis to cause them to clear the wheels entirely. As the lever comes back the power, or leverage of the spring on it, increases, since the spring acts 011 the lon ger arm e more nearly at right angles to its length. Consequently the power of the spring is applied with greatest eect at the time it is most needed, viz., as that part of the clearing orreleasin g move ment of the brake-shoes at which they have the least tendency to release themselves and clear the wheels entirely. By this means I have found that I can almost instantly bring' the brake-shoes back entirely clear of the wheels as soon as th air is let oit' from the cylinder D.

In Fig. 1, which represents the apparatus as applied to only half a car, I have shown the airpipe d as branching, toward. the end of the car, into two pipes, el d, with ilexible ends. The same pipe d branches at the other end of the car in the same way. In Fig. 2 I have shown these branching pipes in an enh rged view as they are applied on the opposite ends of the same car, and with an arrangement of male and female couplings presently to be explained.

If a single pipe, d, extended from end to end of each car, and had a male coupling at the forward end and a female coupling at the rear end, or vice versa, it is obvious that, in ease any one car was turned end for end, its pipes would not couple into the pipes of the next car at either end, since two male and two female couplings would come together. Now, by branching the pipe d, as set forth, and putting a male coupling, n, on the right-hand pipe d at each end, and a female coupling, u', on the left-hand pipe d at cach end, or vice versa, (either arrangement being followed in all cascs,) it will be seen that each car will have a right-hand male for the left-hand female, an d a left-hand female for the ri ght-h and male of the next car at each end, or vice versa if thereverse arrangementbe adopted; and also that, no matter if any or all the cars of atrain be turned end for end, the couplings will alw. ys have the same relative arran gement 5 and this arrangement of the couplings, diagonally opposite 011 branching pipes, I include as a part of this invention. As shown in Fin'. 3, the couplings at each end are united together. This is usually done when the cars are not in use, and is also done on the rear end of the last car of a train, the better to exclude dust and preserve the couplings from injury.

What I claim as my invention, and desire t0 secure by Letters Patent, is-

l. A bent lever, receiving power, by its shorter arm, from the piston-stem, and communicating the same from its longer arm to the brake-lever, arranged and combined substantially as described.

2. A spiral 0r other suitable form of spring, arranged, in connection with the longer arm of a bent lever, in a power car-brake apparatus, so that the spring will act with a continually-increasing power in causing the brake-shoes to clear the wheels, substantially as described.

3. In a power car-brake apparatus, the diagonally-opposite arrangement of the male and female couplings on the branching air-pipe, substantially as described.

In testimony whereof I, the said GEORGE WEST INGHOUSE, Jr., have hereunto set my hand.

GEORGE WESTINGI-IOUSE, JR. lVitnesses:

W. N. PAxToN, G. H.` CHRISTY.

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