US1212726A - Locomotive drifting device. - Google Patents

Description

G. w.-wYMAN.

LocoMonvE nmmNG DEVICE. APPLICATION'FILED APR. I9. 1916.

Patented Jan. 16, 1917.

omen.

GEORGE W. WYMAN, OF WILMINGTON, DELAWARE.

LOCOMOTIVE DBIFTING DEVICE.

Specification of Lettersr Patent.

Patented Jan. 1e, 1917.

Application illed April 19, 1916. Serial No. 92,120.

To all whom it may concern Be it known that I, GEORGE W. WYMAN, a citizen of the United States, residing at Vilmington, in the county of New Castle and State of Delaware, have invented a certain new and useful Improvement in Locomotive Drifting Devices, of which the following is a specification.

The invention relates to devices for permitting a limited supply of steam to flow to the steamchests and cylinders of the locomotive when the throttle-valve is closed and the engine is drifting. By this introduction of steam the formation of a vacuum in the cylinder and chest is avoided, the desired lubrication is insured and carbonizing is prevented. It is generally recognized that such auxiliary supply is desirable in all types of locomotives and especially in-engines using superheated steam. It-is also desirable under certain conditions that such supply shall cease when the locomotive is stopped, thus preventing a possible accumulation of pressure in the cylinders, but is mainly of advantage in avoiding the escape of steam around the valve stems and pistonrods, or other leakage, while the locomotive is at rest.

The object of this invention is to provide automatically operated means whereby the required limited quantity of steam is supplied to the valvechests and cylinders while drifting, and such supply is cut 0H when the locomotive is stopped. l

The invention consists in certain novel features of construction and arrangements of parts, by which the above objects are attained, to be hereinafter described and claimed.

The accompanying drawings form a part of this specification and show an approved form of the invention.

Figure 1 is a side elevation showingthe application of the invention to a locomotive. The latter is only partially shown. The succeeding figures are on a larger scale. Fig. 2 is a vertical longitudinal section showing the valve mechanism for controlling the auxiliary steam supply. Fig. 3 is a corresponding elevation at a right angle to the preceding ligure, and partly in vertical section. Fig. 4 is a horizontal section taken on the line 4-4 in Fig. 2. Fig. 5 is a vertical section taken on the line 5--5 in Fig. 2, and partly in elevation. Fig. 6 is an elevation showlng certain piston valves and their connections.

the header C at any desired Similar letters o f reference indicate the same parts in all the figures.

Referring to Fig. 1, A is the boiler of a locomotive, shown by the dotted lines as having a dry-pipe B joined to the header C of a superheater, and having steam pipes as D, leading from the superheater to the steam chests D1 and cylinders D2. All these parts may be of any approved type.

At the rear of the boiler within the cab is a connection A1 which may be the usual turret or bridge, from which extends a pipe L leading to a valve mechanism to be described, and thence through the pipe M to or convenient point thereon or to any connection through which steam may be led to the steamchest D1 and Ycylinder D2. By connecting to -the header C of the superheater, auxiliary steam is supplied to both sides of the locomotive through the one pipe M. Admission (of saturated steam from the boiler to the pipe L is controlled by a ,valve L1 in the cab.

The valve mechanism for automatically controlling the auxiliary flow of steam through the pipes L and M to the valvechests and cylinders. is contained in a casing F introduced alongside the boiler near the front, between the pipes L and M by any suitable couplings, and has a vertical extension F1 on which is a bonnet F5. The casing F has a diaphragm or partition F2 in which is a valve-seat F3 for a vertically movable check-valve G mounted in axial alinement with'the extension F1 and bonnet F5, and between the valve-seat F3 and pipe M, in the chamber 'f1 is a valve-seat F* adapted to receive a horizontally movable checkvalve' H. The valve G. is arranged to shut olf communication from the pipe L through the passage fand valve-seat F3, and the checkvalve H is arranged to shut off communication between the space below the valve-seat F8 and ipe M.

The valve H matches to the horizontal chamber or cylinder f1 in which it is mounted and has a packing-ring H1. The valve H is ided by a stem H2 received in the central oss of a spider-frame H8 which also serves as a stop to limit the outward movement of the valve. At the outer end of the chamber f1 are by-passes or portsA f2 formed in the casing and adapted to permit steam to flow from one face of the valve H to the other when the latter is in its outward position, and pass to the steam-chest.

y'from the passage f through the bonnet is an The vertical valve G has a stem G1 extending upwardly and carries at its upper end a piston J movable vertically in the cylinder j in the bonnet F5 in unison with the movements of the valve G. The latter is also fitted piston-wise in its chamber g above the valve-seat and separated from the cylinder j by 'a horizontal disk K through which the valvestem G1' passes.

In the wall of the 'extension and bonnet is a, vertical steam passage 7'2 leading steam an inlet port js to the cylinder y', vand ontheopposite side of exhaust passage 7'4 in communication with the cylinder j through the ports 'j j and to the atmosphere through the port or opening i7 in the cylinder j between the horizontal check-valve G and the under face of its piston J. The thickness of piston J is such, and the inlet port 7'3 and exhaust ports i5, je are so located relatively thereto, that when the piston vis down, as

shown in full lines in Fig. 2, and the valve G is seated, the inlet port i3 is open and the lowermost exhaust port je is closed permitting steam from the boiler to fill the passages jz j* and the cylinder j above the piston; and when the piston is raised to the position shown in dotted lines in Fig. 2, the.

inlet port is covered and both exhaust ports uncovered, permitting the steam imprisoned above the piston to flow through the port j passage j* and port j to the space below the piston whence it escapes freely through the opening j7 which is always open to the atmosphere.

N is a spring encircling the stem Gr1 and abutting against the disk K, serving by its slight expansive force against the piston J to lift the valve G from its seat and also to cushion the valve in its seating movement.

IThe spring N is inclosed and guided in a sleeve N1 on the disk K.

P is a plunger mounted to move vertically in a plug P1 of the bonnet F"5 and containing a spring P2 abutting at one end against a collar P3 on the plunger' and at the other against an adjustable screw cap or follower Pi on the plug, and exerting its force to hold the plunger yieldingly downward with its lower end projecting axially through the plug P1. The plunger receives the impact of the piston on its upward movement and the force thus stored in the spring P2 serves to initiate the downward movement of the piston J and valve G, as will appear.

yOn the inner face of the horizontal checkvalve H is an arm or extension H4 having an inclined face la, adapted to strike against and coact with a downwardly extending pin G2 on the valve G and lift the latter as the valve H approaches its seat F4 and hold the valve G and its connected piston J in the elevated position until the outward movescrewed centrally into the top I Lerares ment of the valve H permits the pin G2 again to ride down the beveled face h of the arm H4'. A ball G3 loosely mounted at the lower end of the pin G2 serves as a roller to reduce the frictional contact of the pin and arm. The latter is shown as rectangular in face view and is guided in a corresponding notch f3 in a boss F6 formed on the interior of the casing F. This engagement with the notch prevents rotation of the arm and insures proper presentation of the beveled face to the ball G3. The inlet port ja from the passage j2 is controlled by a screw J1 by which the effective area of the port may be varied.

-It will be seen that the inward movement of the valve H raises the valve G from its seat :nd permits steam to flow from the pipe L through rthe valveseat F 3, and at the same time raises the piston J to cover the inlet port ja and open the exhaust ports j j.

The operation may be briefly described as follows :*When the locomotive is running normally with the throttle open, the pressure Ain the steam pipe D acting through the pipe M on the large area of the horizontal checkvalve H forces the latter to its kseat thus shutting off communication through the pipes L and M, and by the action of the inclined face k on the pin G2 holds the vertical checkvalve G and its piston J in the elevated position with the inlet port js covered, as shown in dotted lines in Fig. 2.

When the throttle is closed, as when the engine is drifting, the pressure in the pipes D and M falls and steam from the boiler through the pipe L and valve-seat F 3 acting upon the inner vface of the valve H forces it outwardly to the position shown in full lines in Fig. 2, while the vertical checkvalve G is held in the partially elevated position by the spring N and steam flows freely through the pipe L, valveseat F 3, chamber f1, ports f2 to the pipe M and thence to the steamchests and cylinders to supply the required volume of wet steam; the vertical valve G is held from its seat by the slight force of the spring N although the inlet port is uncovered, for the reason that the idle reciprocations of the pistons in the cylinders of the engine call for more steam than can be supplied through the pipes L and M and consequently draws from all sources, resulting in a reduction of pressure on the upper face of the piston J below that required to -force the piston downwardly against the oppassages f and je, and inlet port js, builds` H is also considerably greater than that of' the valve H matches' 'f1 its outward movement is effected easily and positively. The

the piston J, and as closely in its'cylinder inlet port 'j3 and exhaust port j are so liocated that the. former is c overed bythe piston J before 4the latter is uncovered, and when the exhaust port j is open, lsteam from .A above the piston escapes freely.

ated by boiler pressure and .The spring I2 serves as an aid to gravity in insuring the initial'downward movement of the piston J far enough to uncover vthe inlet' port 7'3- as soon as the piston J and valve G are released by the 'withdrawal of the arm H4, but the spring I2 and its plunger P may be omitted, relying upon the partsA alone toinduc'e the descent. Other modifications may be made in the forms and proportions 'of the parts, and in the relative arrangements of the checkvalves and several ports and passages in adapting the invention to various types of locomotives.

I claim :f- 1 In a device ofthe character set forth, an augiiliary pipe leading steam from the boiler to the steamchest of an engine, a

checkvalve in :said pipe actuated by steami chest pressure and adapted to 'close said casingv Vhaving 4a passage` pipe, a second checkv'alve in said pipe actusaid pipe, and means operated by the differone'of` said ond when the engine is unning, closing said second valve and 'opening the other when the en ine is stopped, and holding both of said va ves open when the engine is drifting.

2. In a dev-ice of the character set forth, an auxiliarypipe leading steam Afrom the boiler to the steamchest V of an engine,v a

checkvalve' in said' pipe subject to .steamichest pressure and arranged to seat in one direction and close said pipe, a second checkvalve in said pipe actuatedby boiler pressure in said pipe. and` arranged to seat in the opposite direction'and close'said pipe, and means automatically operated by thel difference in such pressures for closing one'of said valves and opening the second when the engine is running, closing said second valve and opening the other when the engine is stopped, and'holding'both of said'valves open when the engine is drifting,

3. In a device of the character set forth, an auxiliary pipe leading steam from the boiler to the steamchest of an engine, a checkvalve in said pipe subject to steamthe areaof the piston J v 'arranged to seat in.

"first of said checkvalves second when the engine is running,

f an auxiliary pipe weight of the seats to close said pipe adapted to close of an engine,

ence in such pressures for automatically closvalve arranged to valves.- and opening the `sec-'- boiler by 'a downward movement, a

movable v'checkvalve arranged to close -direction and close said pipe, a second checkvalve in said pipe of less area than the-'irst, the opposite direction Aand actuated by boiler and means actuated by checkvalve for openand close said pipe,l pressure in said pipe, the closing of said first ing said second checkva'lve, ated by the difference in effective pressures on said valves for automatically closing the and' opening the i closing the second of said checkvalves and opening the first when -the engine is stopped,'and opening both of said checkvalves when the engine is drifting.

,4. `In a device of the' character set forth,

leading steam from the boiler to the steamchest of an engine, a casing in said pipe having two oppositely arranged valveseats therein, a checkvalve on the steamchest side of said casing arranged to eoac't with one ofr said seats to close said pipe `under steamchest pressure, a second checkvalve on the boiler side of said casing arranged to coact. with ,the other of said and Aoperated by the closboiler pressure,j means actuated b valve for ing movement-ofsad rst chec opening said ,second checkvalve, yielding .means for supporting,`

said -second checkvalvev in the openv position, and means subject lto boiler ressure and acting in opposition to said yielding means for closing said second checkvalve.

communication at vone end with asteam boiler and at the other 'with the steamchest a Vvertically movable checkclose vsaid passage from such v boiler byja .downward movement, a horizontally movable checkval've arranged toV closeis'aid passage to such steamchest by a movement toward'said verticalvalve, a piston carried by. said vertical valve and movablevertically in a cylinder in said'casing, said cylinder having exhaust orts, and an inlet -port' in'communication w-i't such boiler, said ports arranged ito -be opened and closed by themovements of said piston, and means carried by said horizontal valve forlifting said vertical valve and. piston by the closingmovement of said horizontal valve.'

6 In a device'of the character. setforth, 4a casing having a passage therethrough y in' ycommunication at one end with a steamV boiler and at the other end with the steamchest of an engine, a vertically movable checkvalve closing such passage'from such horizontally said passage tosuch steamchest by a movement toward 4said vertical valve, a piston carried by said vertical valveand movable chest pressure'fand. larrangedto-seat in one and means operv ioo 5. In a deviceof'the-'character set forth, a

therethrough in ros vertically in a cylinder Ain said casing, said cylinder having exhaust ports, and an lnlet port 1n communication w1th such bo1ler,sa1d

ports arranged to be opened and closed by the movements of said piston, a pin on said vertical valve extending through its seat, and an arm on said horizontal valve having an inclined face adapted to engage said pin and lift said vertical valve and piston by the closing movement of said horizontal valve.

7. In a device of the character set forth, a casing having a passage therethrough in communication -at oneI end with a steam boiler and at the other with the steamchest of an engine, a vertically movable checkvalve arranged to close said passage from such boiler by a downward movement, a horizontally movable checkvalve arranged to close said passage to such steamchest by a movement toward said vertical valve, a valve-stem on the latter, a piston mounted on said valve-stem, a disk in said 'casing between said vertical valve and piston, a cylinder in said casing receiving said piston, said cylinder having exhaust ports, and an inlet port in communication with such boiler, said ports arranged to be opened and closed by the movements'of said piston, means carried by said horizontal vertical valve and piston by the closing movement of said horizontal valve, and a spring on said disk arranged to hold said vertical valve yieldingly from its seat until forced theretoby pressure on said piston.

8. In a device of the character set forth, a casing having a passage therethrough in communication at one end with a steam boiler and at the other with the steamchest of an engine, a vertically movable checkvalve arranged to close said passage from such boiler by a downward movement, a horizontally movable checkvalve arranged to close said passage to such steamchest by a movement toward said vertical valve, a valve-stem on the latter, a piston mounted on said valve-stem, a disk in said casing between said vertical valve and piston, acylinderv in said casing receiving said piston, said cylinder having exhaust ports, and an inlet port in communication with such boiler, saidports arranged to be opened and closed by the movements of said piston, means carried by said horizontal valve for lifting said vertical valve and piston by .the vclosing movement of said horizontal valve, a spring on said disk arranged to hold said vertical valve yieldingly from its seat until forced downwardly by steam pressure on said piston, anda sprlng 1n said casing above said piston arranged to act upon said piston and initiate such downward movement.

9. In a device of the character set forth, a casing having a passage therethrough in communication at one end witha steam boiler and at the other with the steamvalve for lifting said' a vertically movable checkvalve arranged to close said passage from such boilerjby a downward movement, a horizontally movable checkvalve arranged to close said passage to such steamchest by a movement toward said vertical valve, a piston carried by said vertical valve and movable vertically in a cylinder in said casing, said cylinder having exhaust ports, and an inlet port in communication with such boiler, said ports arranged to be opened and closed by the movements of said piston, an arm on said horizontal valve having an inclined face,a guide in said casing receiving said arm, a pin on said vertical valve projecting through its seat with its lower end in the path of said arm, said arm and pin arranged to serve in lifting said vertical valve by the closing movement of said horizontal valve.V

10. In a device of the character set forth, a casing having a passage therethrough in communication at one end with a steam boiler and at the other with the steamchest of an engine, a vertically movable checkvalve arranged t-o close said passage from such boiler by a downward movement, a horizontally movable checkvalve arranged to close said passage to such steamchest by a movement toward said vertical valve, a piston carried by said vertical valve and movable vertically in a cylinder in said casing, said cylinder having exhaust ports, and

chest of an engine,

y an inlet port 1n communication Wit-h such boiler, said ports arranged to be opened and closed by the movements of said piston, and means carried by said horizontal valve for lifting said vertical valve and piston by the closing movement of said horizontal valve, said piston having an area greater than said vertical valve, and said horizontal valve having an area greater than said piston.

11. In a device of the character set forth, a casing having a passage therethrough, two independently movable checkvalves controlling such passage, and means carried by one of said valves and 'operable in its closing movement, for opening the other of said valves.

12. In a device of the character set forth, a casing having a passage therethrough, two independently movable checkvalves controlling such passage, a cylinder in said casing, a piston carried by one of saidvalves and received in said cylinder, and means carried by the other of said valves and operable in its closing movement, for lifting said piston and its connected valve. v

13. In a device of the character set forth, a casing having a passage therethrough, two independently ling such passage, a cylinder in said casing, a piston carried by one of said valves and received in said cylinder, means carried by the other of said valves and operable in its movable checkvalves control- IBO closing movement, for lifting said piston and its connected valve, and a spring serving to support yieldingly said piston and its valve when the latter is released by the withdrawal of such lifting means.

14. In a device of the character set-forth, a casing having a passage therethrough, tWo independently movable checkvalves controlling such passage, a cylinder in said casing, a piston carried by one of said valves and received in said cylinder, means carried by the other of said valves and operable in its when the latter is released by closing movement, for lift-ing said piston and its connected valve, a spring serving to support yieldingly said piston and its valve the Withdrawal of such lifting means, and a spring in said casing serving to initiate the return movement of said piston and its valve when thus released.

In testimony that I .claim the invention abovel set forth I aliX my signature.

GEORGE W. WYMAN.

Images