USRE12758E - Safety-valve fob air-brakes - Google Patents

Description

EEIssUEE MAE. 10.1908.

T. lEEHANl SAFETY VALVE EOE AIE BRAKES.

APPLIGATIOE 'FILED NOV. 26, 1907.

Iliff 'AAA' me/who n THOMAS BEHAN, or ALIQUIPPA, PENNSYLVANIA.

SAFETY-VALVE FOR AIR-BRAKES.

Specification of Reissued Letters Patent.

ReissuedMar. 10, 1908.

Original No. 867,234, dated October 1, 1907, Serial No. 383,432. Application for reissue filed November 26, 1907.

' sen'ai No. 403,992.

To all whom it may concern:

Be it known that l, THOMAS BEI-IAN, a citizen of the United States of America, residing at Aliquippa, in the county of Beaver and State of Pennsylvania, have invented certain new and useful Improvements in Safety-Valves for Air-Brakes, of which the following is an amended specification.

This invention relates to safety valves for air brakes, and is designed as an improvement upon the invention disclosed in United' States Letters Patent No. 852,157, granted to me under date of April 30th, 1907. The primary object of the present improvement is, to provide an attachment for the lever employed in the patented ydevice above referred to, to prevent the entire closing of the safety valve in case of an accidental break in the train pipe.

The construction of the improvement will be fully described hereinafter, in connection with the accompanying drawing, and its novel features will be deiined in the appended claims.

In the drawing: Figure 1 is a plan view partly broken away and partly in section of the invention applied to the train pipes, and hose connections of an air brake system, Fig. 2 is a view partly in plan, and partly in longitudinal section, Fig. 3 is a detail side elevation, Fig. 4 is a transverse section on the linel 4 4 of Fig. 3, Fig. 5 is a side elevation of the valve operating lever and its depending pivoted arm, Fig.'6 is a sectional view illustrating the pivotal connection of the depending arm of the lever, and Fig. 7 is a plan of one of the hose couplers showing a hose attached thereto and broken away.

The reference numeral 1 designates a sec tion of pipe one end of which is bent downward at an angle as at 2, and provided with internal screw threads 3 and a hose seat 4. The pipe section 1 conforms substantially to an elongated angle cock 5 which controls the passage of air through said pipe. The pipe 1 is provided with a longitudinal bore 6 which extends from the angle end of the pipe to the opening which receives the valve 5 and within the bore 6 is a piston 7 provided adjacent one end with packing rings 8. The opposite end of the piston 7 is provided with a U- shaped head 9 adapted to span and engage the angular end 10 of a lever 11 fulcrumed upon the squared end 12 of the plug or cock 5.

The piston 7 is provided with a longitudinal groove 14 and engaging in said groove is a ,screw 13 carried by the pipe 1 said screw acting as a stop to limit the movement of the piston within the bore 6 and also to guide the piston therein.

Engaging inthe end 2 of the pipe 1 is a nipple 16, having a tapering end 17 upon which a section of hose 18 is secured by a suitable clamp 19, and surrounding the hose 18 is another hose 20 of larger diameter than the lhose 18 providing an annular space 21 between the two hose sections, said space communicating with the bore 6 of the pipe 1. The end of the hose 20 is secured upon the Aseat 4 by a clamp 22.

One of the hose couplings employed in connection with my improved safety valve is illustrated in Fig. 7 of the drawing, said coupling being of the ordinary type except that its face 23 is provided -with an auxiliary portn 24, communicating by a port 25Vwith the-annular space 21.

he pipe sections lare suitably connected tothe respective sectionsof the train line .pipe 26 as shown. n Y,

One end of the lever 11 is bifurcated tol provideY ears 27 which are perforated Ato receivea Vpivot pin 28 from which is suspended an arm 29. A split lwasher 30 isinterposed between one side of the arm 29 and the adjacent ear 27 of the lever to vmaintain said arm in proper'relation with the lever.

In operation, the air of one train line has direct passage through the hose 18 and the pipe 1 to another train tline when connections are established between two cars. Should the hose 18 burst, the air entering the annular space 21 will pass into the bore 6, and force the piston head 8 outwardly causing the head 9 of the piston to-strike the end 10 of the lever 11 of the valve 5, thus operating said valve and shutting off the air of the train pipes.

To effect a gradual setting of the brakes I provide the pipe section 1 with a projecting lug a formed with an air passage b. When the valve 15 is turned to the position shown in Fig. 4 a portion` of the air entering the bore 6 will escape to the atmosphere and the volume of this escaping air is regulated byA turning the valve 15 to permit more or less air to escape through the assage b. lt will thus be apparent that t s feature of the invention affords4 a means whereby the air will escape and allow a gradual setting of the I brakes, which will notify the engineer that there is a defect in the air pipes.

The ordinary plug valves will be used in connection with the train pipe 26, whereby a train pipe n the last car may be closed to preventthe air from escaping when the train 1s 1n operation.

. The arm 29 depending from the lever 11 limits the movement of the said lever, and

prevents the complete closing of the valve 5,

which will permit sufficient air to pass through the partlyclosed valve 5 and escape through the valve or vent to permit the brakes to set or close slowly.

Having fully described my invention what I claim and desire to secure by Letters Patl ent, is

l. In a coupling for air brake systems, the

A combination with two train pipe sections, of

angle pipe sections connected to the adjacent ends of the train pipe sections, a valve in the passage-wa said coupling members with the angle pipe sections, the space between said hose sections communicating with the auxiliary passage- Way in the angle pipes, and an arm 29 depending from each of said levers.

2. In a coupling for air brake systems, the combination with two train pipe sections, of

angle pipe sections connected to the adjacent ends of the train pipe sections, a valve in each angle pipe section, an auxiliary'passageway in each angle pipe section, a projection from each angle pipe formed wlth an air passage communicating with said auxiliary passage-way, and a valve seat, a valve 'or vent within said seat having a transverse bore, a piston in each of said auxiliary passage-ways having one end extending outside the passage-Way, and provided with a head or lever on the valve engaged by said head, an arm pivotally secured to said lever and serving to limit its movement, coupling members, coupling pipes connecting said coupling members with the angle pipe sections, and air-tight pipes surrounding the coupling pipes.

3. A traln pipe safety device, comprising an angle pipe section, a plug valve therein, an auxiliary passage-way in the pipe section, a projection from each angle pipe formed with an air passage communicating with said auxiliary passage-way, and a valve seat, a valve or vent within said seat having a transverse bore, a piston in said auxiliary passageway, having one end extending outside of the passage-way, a U-shaped head on said end, a lever on said valve, engaged by said head, a stoprcarried by the angle pipe section engaging in a groove in the piston and limiting the travel of said piston, an arm pivotally secured to said lever, and a split washer on the pivotal support of said arm.

In testimony whereof I have hereunto set my hand this 9th day of October, 1907.

THOMAS BEHAN.

In presence of-- JOHN A. KRAUs, 1,; WILLIAM FLINN.

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