USRE5506E - Improvement in steam-power car-brake apparatus - Google Patents

Description

G. WESTINGHOUSE, .|r. Steam-Power Car-Brake Apparatus. No. 5,506.

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i the escape-port a.

UNITED STATES PATENT OFFICE.

GEORGE WESTINGHOUSE, JR., OFPITTSBURG, PENNSYLVANIA..

IMPRC'VEMENT IN S-TEAM-POWER CAR-BRAKE APVPRATUS.

Specification forming part of Letters Patent No. 115,667', dated June 6, 1871; reissue No. 5,506, dated July 29, 1873 application ledMay 26, 1873.

To all whom it may concern:

- Be it known that I, GEORGE WEsTING- HOUSE, Jr., of Pittsburg, iu the county of Alle! gheny and State of Pennsylvania, have invented aA new and useful Improvement in- Steam-Power Gar-Brake Apparatus. I do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawing, showing, by views partly in section and partly in plan, certain detached parts of my air-brake apparatus, already patented to me, and illustrative of the improvement for which I now desire Letters Patent.

' My present invention-relates to certain improvements inthe steam-power air-brake patented to me 13th April, 1869.v Of the parts described in that patent the accompanying drawing contains the three-way cock A A',

vshown in horizontal sections through the ports, the air-pipes B .leading thence to the brake-cylinder (l, which latter, as in that patent, is furnished with a piston, piston-stem D, and bifurcated head D', all operated asin said patent set forth. In the patent referred tothe brakes are described as being released or let oi' simply by turning the three-way cock to the position'shown in the accompanying drawing. The air in the. cylinder C in front of the piston then passes out by the pipes B' B through the inlet-port c and out at I have found in practice that while the c ompressedair readily escapes in this way, it4 does not always release the brake-shoes from their hold on the wheels as instantaneously as could be desired on a train which has onlyl time to-make short stoppages, in case the piston and stem happen to Work with some friction. For the purpose of guarding against the occurrence of this I have combined with the devices named what'is coinmonly known as the steam Siphon-pump, by the `action of which the air is almost instantaneously exhausted from the cylinders down 'to or below ordinary atmospheric pressure,

and thereby the brake-piston is forced backby th'e pressure on the-opposite side thereby, and brakes are instantaneously released or let oli'.

Toeuable others skilled in the art to'make and use my improvement, I will proceed to describe its construction and mode of operation.

rIhe waste-pipe b: communicates` directly with the escape-port a.V On the outerend of it is aT-pipe, b", in one end of which I screw` the nozzle c, which, by a pipe, c', communicates with either the steam-boiler for the injection of steam, or with the air-reservoir .described in my'patent of 13th April, 1869, for the injection of air.

The arrangement of the conical nozzle c with reference tothe waste-pipe may be varied at pleasure, according to the known lawsgov-V erniug the operation of such devices. The nozzle\ c may be arranged directly in vthe waste-pipe b, but discharging in the direction ofthe ontwardflow of air.

' When it is desired' to let ofi' the brakes the cock A is turned to the position shown. A jet of steam .or compressed air, preferably the former, is turned into thepipe c", which, passing out through the nozzle. c, exhausts the air from the brake-cylinder G through the communicating pi-pes and ports, and almost instantaneously lets off the brakes.

As a modification thereof I have shown a pipe, d, leading direct from'the end of the cy-linder C in front .of the piston, onto which is fastened a T-pipe, d'. In the latter is arranged a nozzle, e, similar in construction to that last described,taking steam or compressed air through a pipe, e', in like manner and with like eii'ect, andcapable of like modifications las to form and arrangement.. By reversing the arrangementgof the brake-levers this combination may also be;v applied to put on as well as let oi' the brakes.

AThe steam Siphon-pump may be otherwise combined with the brake-cylinder so as to apply or put on the brakes by means ofA the ex-A haustion of the air from the cylinder back ot' the pistoni. c., on the side toward which it moves 'in applying the brakesinstead ofthe compression of the air inthe cylinder in front ofthe piston.l

To illustrate this I .have shown a pipe, f, leading from the end of the cylinder G toward whichit is desired the piston should travel in applying the brakes. communicates' with a T-pipe, f, in which is arranged 'a conical nozzle, g, as already described, and capable of like. modifications.

Compressed air or steam then being passed The Vouter end of this l vthrough the pipe g and nozzleyptlxe air will b e exhausted from the cylinder O back of the piston, which will -cause the latter to travel back, and, through its stem D, to operate the brakelevers and apply the brakes, asin my previous patent set forth.

If steam be used in exhausting the air from the cylinder C, it will be found sometimes that vafter the exhaustion has been carried below` atmospheric pressure, a reaction will take place, which, if not provided against, will carry some of the steam back through the airouttlow pipes into the cylinder C, Where it condenses, and where the presence of water is objectionable. To prevent this-inflow of steam I arrange, at any desired point back of the steam-discharging, pipe, and between. it and the cylinder C, a checkwalve, m., seat it in a diaphragm, m', and guide it by a stem, n, or

in other known way. l

As shown, the valve m seats itself by its ownweight; but itmay be A plaeed in any l other desired position, and be seated byv a spring or other equivalent device. Such avalve may be arranged in any of the pipes b df. -As thus arranged it permits the outflow of air, but prevents the inflow of steam when the reaction ofatmospheric pressure takes place.

That I claim as my invention, and desire t-o secure by Letters Patent, is-

l. A steam or ,air dischargingnozzle, arranged in the air-outow pipe of a oar-brake cylinder, discharging in the direction of the outflow of air from the cylinder, and in ,com-Y bination with such cylinder, substantially as described. Y

l2. In combina-tion with the subjectmatter oi'lthe previous claim, a check-valve, m, ar-L ranged substantially as set forth..

3. In a power-brake apparatus, abrakecylinder and piston in which air pressure is applied to one side of the piston 1n order to a-pply the brakes, and to the opposite side to release them. l Y

In witness whereof I, the said GEORGE WnsrrNGHoUsn, .J r., lhave' hereunto set my hand. x

GEORGE WES'DINGHOUSE, JR. Witnesses:

T. B. KERK, G. H. UrmIsrY.

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