US1312453A - Pressure-retaining- valve - Google Patents

Description

A. B. MYERS.

PRESSURE RETAINING VALVE, APPLICATION man NOV. 10. um. RENEWED OCT. 29.1918.

Patented A 1 2 SHEETS SHEET MO p A. B. MYERS.

,PRESSURE RETAINING VALVE. APPLICATlON FILED NOV-10' 1917- RENEWED OCT-29,1918. 1,312,453.

Patented Aug. 5, 1919.

2 SHEETSS- EEEE 2.

UNITED STATES rarer nnrnn.

ALFRED B. MYERS, OF GATES, OREGON.

PRESSURE-RETAINING VALVE.

Application filed November 10, 1917, Serial No. 201,332. Renewed October 29, 1918.

To all whom it may concern:

Be it known that I, ALFRED B. lvlYnRs, a citizen of the United States, residing at Gates, in the county of Marion and State of Oregon, have invented new and useful Improvements in Pressure-Retaining Valves, of which the following is a specification.

This invention relates to new and useful improvements in pressure retaining valves for use in connection with air brakes and the principal object of the invention is to provide means which will enable the engineer to retain the brakes in braking position on the cars and to reduce the pressure of said brakes whenever necessary.

Briefly, the invention comprises a valve connected With the retaining chamber and having a plunger for operating the valve, means for operating the plunger by the pressure from an auxiliary pressure tank and .means for controlling said pressure by a valve in the cab of the engine.

Another object of the invention is to provide a device of this character which is simple and durable in construction, reliable and eflicient in operation and one which can be manufactured and placed upon the market at a minimum cost.

The invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claims.

In describing my invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which Figure 1 is a diagrammatic view illustrating the arrangement of the various parts of the invention.

Fig. 2 is an enlarged longitudinal sectional view taken through the pressure retaining valve.

Fig. 3 is a longitudinal section of the engineers valve.

Fig. 4 is a cross sectional view on line 4-4 of Fig. 3.

In these views 1 represents the main reservoir which is connected with the train pipe 2 in the ordinary manner and connection between the two is controlled by the usual engi neers valve 3. The train pipe is connected with the brake cylinders as usual and as these elements form no part of my invention they Specification of Letters Patent.

will not be described further. at indicates the auxiliary reservoir which is connected with the main reservoir by pipe 5 in which is a reducing valve 6. 8 indicates a part of the retaining chamber which is suitably connected with the brake cylinders as usual. To this chamber is secured my improved air retaining valve indicated generally by the numeral 9. As shown this valve comprises a body part 10 having the chamber 11 therein and the passages 12 and 13 extending from each end of the body and communicating with the chamber 11. As will be seen the passage 13 is in a diiferent longitudinal plane from the passage 12 so that said passages are out of alinement, the passage 12 communicating with the chamber 10 at the upper end thereof and the top of said chamer having a groove 11 therein which forms a continuation of the passage 12 and communicates with an oil passage 15 centrally arranged and leading from the top of the chamber through the body. 16 indicates a valve seat adapted to rest on the top of the chamber and provided with a central hole 17 of tapered formation on its lower edge to receive a ball valve 18. This valve seat is in the form of a plate and I prefer to have the same provided with screw threads on its edges to engage with screw threads formed on the wall of the chamber. As will be seen the groove 14 passes under the valve seat and communicates with the opening therein so that the air passing through the passage 12 must pass through the hole 17 in the valve seat and as the passage 13 is located below the valve seat the air passing through said seat will flow through the said passage 13 which leads to the atmosphere by means of the bent pipe 19. 20 indicates a cylinder having its end screwed into the lower end of the chamber 11 so that said cylinder extends at right angles to the body 10. 21 indicates a piston in said cylinder provided with the usual packing rings 22 and having its upper end provided with a rounded depression adapted to engage the ball valve 18. The lower end of this cylinder is closed by the cap 23 into which a pipe 944: is tapped. This pipe leads to the reservoir 4.

25 indicates the controlling valve for the pipe 24 which is located in the cab of the engine and this valve comprises the cupshaped shell 26 connected at different points to parts of the pipe 24 leading respectively from the auxiliary reservoir and the retaining valve and it is also provided with a. third port 27 leading to the atmosphere. 28 indicates the valve body fitting in the shell and provided with the two ports 29 and 30 which are arranged at right angles to each other and have their inner ends in communication. 31 is a screw cap fitting over said shell and 32 is a handle connecting with the projecting part of the body for operating the same. It will be seen that by moving the valve body the auxiliary reservoir may be put into communication with the cylinder 20 or said cylinder may be put into communication with the atmosphere by way of the port 27. 33 indicates a cut-off valve placed in the pipe 2% so the pipe with the retaining valve on any particular car may be cut out of the system. 34-. is a hand retaining valve located on the pipe 19. This valve is normally in open position.

It will thus be seen thta after an application has been made of the brakes the engineer may retain the brakes in said position by turning the valve 25 so as to put the cylinder 20 in connnunication with the auxiliary tank l. This will cause the piston to move upwardly so as to force the valve 18 on its seat and thus retain the air in the cylinders. When the brakes are to be released the engineer may do this by operatin g the valve 25 to put the cylinder in co1n-- municati on with the atmosphere. The valve 18 together with the piston will be forced away from the seatby the pressure in the retaining chamber or by the action of gravity so that the air may escape through the passages 12 and 13 and the pipe 19. Or if the engineer simply wishes to reduce the pressure of the brakes upon the wheels he may do this by quickly manipulating the valve 25 to reduce the pressure in the braking" chambers.

I utilize the passage 15 as an oil-duct and close the same by a plug 15. As will be seen a few drops of oil placed in this passage will pass through the opening in the valve seat so as to thoroughly lubricate the different partsincluding the piston.

It is thought from the foregoing description that the advantages and novel features of my invention will be readily apparent.

I desire it to be understood that I may make slight changes in the construction and in the combination and arrangement of the several parts, provided that such changes fall within the scope of the appended claims.

What I claim 1s:-

1. A device of the class described comprising a body having a central chamber and ports passing longitudinally through the body and having their inner ends connecting with said chamber, a removable valve seat having an opening therein located in said chamber and situated between said inner ends of the ports, a valve in said chamher, a cylinder connected with said chamber, a piston in said cylinder engaging with the valve to force the same onto its seat, an air pipe connected with said cylinder, and a valve in the engine-cab for controlling said pipe.

2'. A device of the class described comprising a body having a chamber therein and longitudinal ports having their inner ends communicating with said chamber, a valve seat having screw threaded engagement with the walls of-said chamber and located between the ends of the ports, a cylinder having screw threadedengagement with said chamber and extended 6 at right angles from said body, a ball valve in said chamber, a piston in the cylinderfor forcing the valve onto its seat, an air pressure pipe connected with said cylinder, and means in he engine-cab for controlling said pipe.

3. A device of the class described comprising a body having a passage-Way therethrough, a valve controlling said, passageway, a piston for forcing said valve onto its seat, a cylinder for receiving said piston, an air pipe connected with said cylinder, an air reservoir connected with said pipe, a three-way valve in said pipe for placing the cylinder in communication with the reservoir or with the atmosphere.

In testimony whereof I aflix my signature.

ALFRED B. MYEns.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.

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