US1864225A

US1864225A - Throttle valve operating means

Info

Publication number: US1864225A
Application number: US310284A
Authority: US
Inventors: Williams Arthur
Original assignee: AMERICAN THROTTLE Co Inc
Current assignee: AMERICAN THROTTLE Co Inc; AMERICAN THROTTLE COMPANY Inc
Priority date: 1928-10-04
Filing date: 1928-10-04
Publication date: 1932-06-21
Anticipated expiration: 1949-06-21

Description

June 21, 1932. A. WILLIAMS 1,864,225

THROTTLE VALVE OPERATING MEANS Filed Oct. 4. 1928 2 Sheets-Sheet l INVENTOR Alarm/1e WILL IAMJ June 21, 1932. A. WILLIAMS THROTTLE VALVE OPERATING MEANS Filed Oct. 4. 1928 2 Sheets-Sheet 2 mu: .Ewmdu Patented June 21, 1932 UNITED STATES ARTHUR WILLIAMS, OF NEW YORK, N. Y.,

ASSIGNOR '10 AMEBIdAN' THROTTLE GOI- PANY, INC., 01 NEW YORK, N. Y.

THROTTLE VALVE OPERATING MEANS Application filed October 4, 1928. Serial No. 310,284.

manufacturing and maintenance costs will.

he comparatively low.

A further object is toprovide a device of the character described which will be certain and positive in operation and in WlllCh when the usual manually operated cab lever is set in adjusted position, the throttle Valve will be maintained at the desired throttle opening without variation.

The above and other objects will appear more fully from the following more detailed description and by reference to the accompanying drawings forming a part hereof,

wherein Fig. 1 is a partial diagrammatic side elevation of a locomotive equipped with a throttle operating means embodying the principles of the present invention; Fig. 2

is an enlarged longitudinal section through 3 the power deviceiof "the present invention; Fig. 3 is an enlarged section on the line v3- 3 of Fig. 2 and Fig. 4 is a section through the piston taken on the line 44 of Fig. 3.

As shown in the drawings, the numeral 10 indicates the, throttle valve actuating shaft of a locomotive. For the purpose of the present disclosure the invention has been illustrated as installed upon a locomotive of the type employing superheated steam and in which .a plurality "of throttle valves, not shown, are actuated by a number of cams, or the like, secured to the shaft 10. The constructional details of the throttle valves of this particular type are well known in the art and, as such details form no part of the present invention, they are not illustrated in the drawings. It will be'suflicient to state that when'the throttle valve shaft 10 is rotated, cams, or other means carried there- 53 by, are caused to become operative to open rod 13. The piston rod 13 passes through the central bore of a cylinder head 14 secured to the end of a cylinder 15. The latter is provided with a pair of lugs 16 by means of which the cylinder may be secured to any stationary support such as the side wall of the locomotive boiler. At its inner end the piston rod 13 terminates in an enlarged head or extension 17 which is secured, as by the bolts 18, to a hollow piston 19. Secured to the other end of the piston 19 is a similar extension 20 of a second piston rod 21. The latter passes through the central bore of avsecond cylinder head 22. The

cylinder heads

14 and 22 are secured to the cylinder 15 by any suitable means such as the bolts 23.

Slidably mounted within the bore of the hollow piston rod 21 is a sleeve 24 the bore of which has also slidably mounted therein a rod 25. The sleeve 24 and rod 25 form a pair of relatively adjustable members as will presently be more fully described. Both the sleeve 24 and rod 25 project outwardly beyond the outer end of the piston rod 21. The

outer projecting end of the sleeve 24 immediately adjacent to the end of the piston rod 21 is screwthreaded and is secured within one of a pair of screwthreaded bossesprovided on a connecting member 26. The sleeve 24 extends beyond the threaded portion just referred to and the-end of the sleeve serves as a seat or abutment for oneof a pair of adjusting nuts 27. These nuts are screwed upon the outer end of the rod 25 and are received within the space between the endof the sleeve 24 andthe inner face of the other screw threaded boss of the member 26. In order to prevent the rod 25 from turning when the nuts 27 are adjusted, the end of the rod 25 is preferablymade of non-circular cross sectional configuration, as indicated by the reference character 28, and is received within a recess 29 formed in the member 26 of similar cross sectional configuration.

At their inner ends, the sleeve 24 and rod are formed with the enlarged heads 24' and 25 respectively. These heads project into a recess or space defined between a pair of enlargements 19 in the bore of the hollow piston 19 and said heads are adapted to engage respectively with the ends of a pair of valves 31, 32. Located between the inner face of the enlargement 20 of the piston 21 and the opposed face of the enlarged head 24 of the sleeve 24, is a stop collar 33, the function of which will presently appear.

Each of the valves 31, 32 is of similar construction and is slidably mounted within a valve chamber or bore formed in the respective enlargements 19 of the piston 19. Each valve, as shown, has a stem, portion 34 which projects beyond the end of the enlargement 19 and into the space 30 above referred to, the end of the stem 34 of the valve 31 being adapted to engage with the head 24 of the sleeve 24 and the similar stem of the valve 32 engaging with the head 25 of the rod 25.

Each of the valves 31, 32 has a central sleeve portion 35 and a terminal sleeve portion 36. At the point wher the central sleeve portion 35 of each valve merges with the stem 33 thereof,'.a poppet valve type, valve seating surface 37 is provided, which surface is adapted to co-operate with a similar surface formed in the enlargement 19", For convenience in grinding the poppet valve surfaces, each terminal sleeve portion 36 is preferably formed with a slot 38 in which a screwdriver or similar tool may be engaged for rotating the valve and pressing the sur-' face 37 during the grinding operation against its valve seat. I y

The cylinder 15 is provided with a threaded boss 40 which communicates with the interior of the cylinder through a port 41. This boss.

40 serves for the connection to the cylinder of one end of a'pipe 42, the other end of which is preferably connected to .the main air tank of the locomotive, or toany other suitable source-of fluid under pressure. Such fluid entering the cylinder passes around the an-- nular space 43 defined between the periphery of the piston "19 and. the inner wall of the cylinder. The ends of this annular-space are .sealed by the cup-shaped gaskets 44, which gaskets are secured tothe piston by the enlarged

heads

17 and 20 of the pistonrods 13 and 21 respectively. This "annular space communicatesbv means of a pair of

conduits

45, 46 with the

chambers

47, 48, in which the heads 36 of the valves 31; 32 respectively are mounted. A passageway 49 is in communication, at such time as the terminal sleeve portion 36 of the' valve 31 is unseated, with a chamber-50, for such valve. This chamber 50 communicates through. a lateral branch 51 with a conduit 52 extendingilongitudinally of the piston and opening to the space of the right hand end of the cylinder 15 between the enlargement 17 of the piston rod 13 and the cylinder head 14.-The chamber 48 of the valve 32 communicates through a similar annular passageway 53, chamber 54, lateral branch conduit 55 and longitudinal conduit 56 with the left hand end of the cylinder 15.

Thelongitudinally' extending conduit 52 communicates through a branch conduit 57 with a chamber 58 for the valve 32, while the longitudinally extending conduit 56 communicates through a similar branch 59 with a similar chamber 60 for the valve 31 for a purpose presently to be described.

Connected to the other threaded boss of the member 26, hereinbefore referred to, is the front end of a reach rod 61, the rear end of which is connected to the usual throttle lever 62, said lever being provided with customary spring pressed pawl 63 adapted to engage a with a toothed quadrant 64; it being understood that the throttle lever and quadrant are located in the-usual manner in the cab of the locomotive.

The manner in which the device operates is as follows: Compressed air or other fluid is admitted to the cylinder 15 and is confined within the annular space 43. When the parts, as shown in Fig. 2 ofthe drawings, are in'f'their normally inactive positions it will be noted that the terminal sleeve portions 36 sages 49, 53 to the chambers 50 and 54 respectively. From these, fluid will flow through the branches 51 and 55 to the

longitudinal conduits

52 and 56 respectively to both the right and left hand end of the cylinder. Pressure will therefore be maintained against both ends of the piston 19 and will build up evenly upon each end. The" movement of the piston,.in effect, is accomplished by exhausting the pressure from either end of the cylinder according to the movement of the piston and throttle desired, fluid under pressure at the same time being admitted freely to the other end of the cylinder. Assuming the conditions to be as above described, that is, the leakage of fluid into the cylinder and the building up of pressure on each side of the piston, if now the engineman wishes to open the throttle, the spring pressed pawl 63 is released and the throttle lever 62 is pulled rearwardly in the usual manner. This movement of the throttle lever is communicated through the reach rod 61 and member 26 to the two part structure formed by the sleeve 24 and operating rod 25. The engagement of'the enlarged head 24 of the sleeve 24 with the stem 34 of the valve 31 will cause said valve 31 to be moved from its seat, the fluid under pressure from the left hand end of the cylinder will flow through the longitudinal conduit 56, branch 59 and, chamber 60, past the valve steam 34 of the valve 31 and will enter the space 30. From this space the air will pass through the bore of the piston 19 to the bore of the piston rod 13 from whence it will flow freely to atmosphere through the hole 70 provided in tubular connecting rod 12. The moving of the terminal sleeve'portion 36 away from the end of the passage 49 will permit a free passage of the fluid from the annular space 43 through the conduit 45', chamber 47, passage 49, chamber 50 to the lateral branch conduit -the valve will be opened.

51, from whence it will flow through the longitudinal conduit 52 to the right hand end of the cylinder. Fom the above it will thus be seen that the piston will move from right to left and that the connection of the piston rod 13 through the connecting link 12 and lever 11 of the throttle actuating shaft will cause the latter to be rotated. It will be understood that this movement of the parts above referred to will cause the shaft 10 to be rotated in a direction such that the throt- As the piston moves from right to left the engineman will exert merely sufiicient force to cause the valve 31 to. remain unseated and to maintain the left hand face of the head 24 in engagement with the stop collar 33, the movement of the piston being followed by theengineman until the desired throttle valve opening is secured. When the latter condition is reached the pawl 63 is again engaged with the toothed quadrant 64 to lock the throttle lever in adjusted position. After the lever has been locked in position there will be a slight movement of the piston in the dire??? tion above described until the poppet valve surface 37 of the valve 31 has again become seated.

The seating of the valve 31 is readily elfected by the difference in pressures present in the apparatus without resort to the use of springs. It will benoted thatduring the time the valve 31 is unseated, as above described, the right hand end of the valve is under atmospheric pressure only. The left hand end of the valve is however subjected to the full fluid pressure existing in the annular space 43 and chamber 47. The full fluid pressure being exerted on the left hand end of the valve and the right hand end thereof being only under atmospheric pressure, it will be obvious that the poppet valve surface 37 will be quickly returned to its seat and held in engagement therewith as soon as the piston performs but a slight movement after the throttle lever is-latched in position.

Vhen it is desired to close the throttle, the throttle lever 62 is moved forwardly in the usual manner. This will cause the valve 32 to be raised from its seat, fluid being exhausted from the right hand end of the cylinder through the longitudinal conduit 52,

branch conduit 57 and'chamber 58 about the valve stem to the space 30, from whence it will pass through the bore ofithe piston rod 13 to atmosphere as described above. At the same time free admission of fluid will take place through the conduit 46, chamber 48, passage 53, chamber 54, branch conduit and longitudinal conduit 56 to the left hand end of the cylinder, the piston 19 then moving from left to right and causing the throttle valve actuating shaft 10 to be moved in a reverse direction to that previously described. lVhen the throttle valve is closed to the desired extent, the engineman will again latch the throttle lever in position. During the closing movement, the movement of the piston 19 will be followed up by a movement of the throttle lever 62 in a manner similar to that described in connection with the opening of the throttle. After the throttle lever has been set in any of its latched positions, and with the parts in the position shown in Fig. 2, the leakage of the fluid past the terminal sleeve portions 36 of the valves 31 and 32 and the building up of the pressure on each side of the piston as hereinbefore described, will bring about a condition in which a cushioning effect is performed by the fluid under pressure between each end of the piston and the adjacent cylinder head so that shocks tending to produce longitudinal movement of the piston are absorbed by the air pressure built up at each end of the piston. It will be noted that when the device is in its normal inactiveposition, the

heads

24 and 25 just contact with the ends of the valve stems of the valves 31, 32 so that but a slight amount of relative movement between the piston and the manually operable member formed by the operating rod 25 and sleeve 24 will bring about an opening of either valve 31 or 32, according to the direction of such movement, consequently creeping of the parts is effectively prevented. In order that any tendency of the apparatus to creep may be quickly and readily corrected, the two part construction consisting of the sleeve 24 and rod 25 is preferred, it being obvious that the distance between the outer faces'of the

heads

24, 25 may be adjusted with great precision by .means of the adjusting nuts 27. It will, of

course, however, be understood that the invention is not limited to the use of the two part adjustable member described and shown but that if desired a valve controlling member of integral construction may be used in place of the two part member shown.

Should there be a failure of the piston to operate under fluid pressure from any cause whatsoever, such, for example, as a failure of the air sup 1y, it will be obvious that the piston may be moved entirely by manual force applied to the throttle lever. 19 In such a contingency the force exe ted on the throttle for opening the throt e valve lever would be transmitted through the head 24 to the stop collar 33 and thence through v the piston 19, piston rod 13 and connecting rod 12 to the lever 11 and throttle valve shaft 10. As the rod 25 and the head 25 thereof are constructed of comparatively small diameter and thickness respectively, it is preferable for the manual closing of the throttle to locate the connecting member 26 so that its front facewillv engage the end of the piston rod 21 before the head 25" abuts the right hand enlargement 19 of the piston thus employing the more rigid and sturdy arts or transmitting the thrust re: quired or the manual closing of the throttle, and avoiding thedanger of breakage of the rod 25, and its head 25.

It will be seen that with a device con- 0 structed asherein disclosed but a small number of moving" parts are required and that all of the parts of the apparatus are of,sim-

ple, sturdy construction, the manufacture of which is confined to simple machining oper- 33 ations. Leakage of fluid past the piston is effectively prevented by means of the on shaped gaskets 44, whileleakage of the fluid past the piston rods is also eflectively prevented by means of similar cup-shaped gaskets 71. In order to reduce frictional resistances each of the c linder heads 14 and 22 is preferably provi ed with a swab rin ent material saturated with oil, or other suitable lubricant.

The maintenance of the installation will be simple and cheap as none'of the parts are subjected to any great amount of wear. Occasional renewal of packing and the grinding in of-the valves 31, 32 will be all that is required. This latter can be accomplished readily by the use of a simple tool, such as a screwdriver, without the necessity of moving I the parts to the shop. It will be noted that with the construction herein disclosed the' jacent the cab to the throttle valve. Therefore any friction between the reach rod and its supports would be overcome by the power actuated piston and as such friction particu- 5 larly in the case of alarge locomotive is considerable the invention thereof possesses marked advantages in this respect.

It will be understood that the invention is not limited to the specific constructional detaib of any of the parts illustrated-but that many changes, variations and modifications may be resorted to without departing from means in said connections whereby pressure fluid is supplied to both ends of said cylinder for normally maintaining fluid pressure upon opposite ends of said piston, and valve means of the poppet type located independently of each other in said connections under manual control for selectively directing the pressure fluid from either end of said cylinder to the exhaust chamber and simultaneously directingpressurefiuid from'said annular recess to the'opposite end of said cylinder, said valve means includi piston members interposed in thepath of the pressure fluid whereby said valve means will be normally urged by said fluid to closed position.

2. An operating motor. of the kind described comprising a cylinder, a hollow double ended piston in said cylinder havin an annular eripheral recess at an interme iate portion t ereof, and provided with an internal space constituting an exhaust chamber,

g a connection from a source. of fluid under "-7.2 which serves toflhold a supply of absorbpressure to said annular cess, connections in said piston leadingfrom said annular recess to opposite ends of said piston respectively and to said exhaust chamber, means in said connections whereby ressure fluid is supplied to both ends of sai cylinder for normally maintaining fluid pressure upon opposite ends of said piston, valve means of the poppet type located independently of each other in said connections for selectively directing the pressure fluid from either' end of said cylinder to the exhaust chamber and simultaneously directin pressure fluid from said annular recess to t e opposite end of said'cylinder, said valve means includin piston members interposed in the path 0 the pressure fluid whereby said valve means will be normally urged by said fluid to closed position, and a manually operable control for actuating said valve means to opened position against the pressure of said fluid.

3. An operating motor of the kind described comprising a hollow double headed and a manually operable control for selectively actuating said valves to direct the fluid to one end of said cylinder and to simultaneously direct the fluid from the other end of said cylinder to said exhaust chamber whereby said piston is moved lengthwise of said cylinder in one direction or the other.

' separate and independent valves of the pop- 1. An operating motor of the kind described comprising a hollow double headed piston having an annular peripheral recess at an intermediate portion thereof and provided with an internal space constituting an exhaust chamber, a cylinder in which said piston is mounted for reciprocation, means for connecting said annular recess with a source of fluid under pressure, said piston being provided with a pair of valve chambers communicating with said annular recess, conduits in said piston leading from said chambers and communicating with said cylinder at opposite ends of said piston and with said exhaust chamber, and a pair of separate and independent valves of the poppet type under manual control mounted in said chambers for selectively directing the fluid to one end of said cylinder and for simultaneously directing the fluid from the other end of said cylinder to said exhaust chamber whereby said piston is moved lengthwise of said cylinder in one direction or the other.

5. An operating motor of the kind described comprising a hollow double headed piston having an annular peripheral recess at an intermediate portion thereof and provided with an internal space constituting an exhaust chamber, a cylinder in which said piston is mounted for reciprocation, means for connecting said annular recess and cylinder with a source of fluid under pressure, including conduits in said piston leading to opposite ends of the cylinder'and communicating with said exhaust chamber, a pair of pet type interposed in said conduits, and a manually operable control for selectively actuating said valves, said control including a two part member normally operable as an .integral structure and adjustable means for moving the two parts of said member relatively to each other to selectively direct the fluid to one end of said cylinder and to simultaneously direct the fluid from'the other end of said cylinder to saidEexhaust chamber whereby said piston is moved lengthwise of said 0 linder in one direction or. the'other.

6. n operating motor of the kind described comprising 'a hollow double headed piston having an annular peripheral recess at an intermediate portion thereof and provided with an internal space constituting an exhaust chamber, a cylinder in which said piston is mounted for reciprocation, means for connecting said annular recess and cylinder with a source of fluid under pressure, including a pair of separate and independent valves of the poppet type carried by said piston and a manually operable control having a portion thereof interposed between said valves for actuating said valves selectively by movement of said control in either direction to direct the fluid to one end of said cylinder and to simultaneously direct the fluid from the other end of said cylinder to said exhaust chamber whereby said piston is moved lengthwise of said cylinder in one direction or the other.

7.-An operating motor of the kind described comprising a hollow double headed ,piston having an annular peripheral recess at an intermediate portion thereof and provided with an internal space constituting an exhaust chamber, a cylinder in which said piston is mounted for reciprocation, means der with a source of fluid under pressure, in-

cluding conduits in said piston leading to opi posite ends of said cylinder and communicating with said exhaust chamber, a pair of separate and independent valves of the poppet type carried by said piston, a manually operable control having a portion interposed between said valves for selectively actuating either thereof to direct the fluid to one end of said cylinder and simultaneously direct the fluid from the other end of said cylinder to said exhaust chamber whereby said piston is moved lengthwise of said cylinder in one direction or the other, and means for locking saidcontrol in adjusted position, said portion serving to actuate automatically either of said valves upon a movement of said piston in either direction due to leakage or to any other cause.

8. An operating motor of the kind described comprising a hollow double ended piston having an annular peripheral recess .at an intermediate portionthereof and having an internal space constituting an exhaust passage for fluid, a cylinder in which said piston is mounted for reciprocation, means for introducing fluid under pressure into said cylinder and annular recess between the ends of said piston, means for preventing the passage of fluid past the ends of said piston, said piston being provided with a pair of conduits which communicate with the space between the ends of the piston and with the spaces between the ends of said piston and'the ends for connecting said annular recess and cylinof the cylinder, a pair of separate and independent valves of the poppet type carried by said piston for controlling the passage of fluid through said conduits, a manually operable control having a portion thereof located between said valves for operating either of said valves selectively and means as-- sage of fluid past the ends of said piston, said piston being provided with a pair of conduits which communicate with the space between the' ends of the piston and with the spaces between the ends of said piston and t e ends of the cylinder, a pair of separate and independent valves of the poppet type carried by said piston for controlling the passage of fluid through said conduits, and a manually operable control having a portion thereof located between said valves for operating either of said valves selectively, said control including a two part member, and means for adjustabl moving the parts of said member relative y to each other.

10. An operating motor of the kind described comprising a cylinder and piston, means for connecting said piston with the throttle valve of the locomotive, said iston being provided with two longitudinal y extendin conduits, one of said conduits communica ing with the space between one end a cylinder, sai piston being of said piston and the adjacent end of the cylinder, and'the other of said conduits communicatingi with the s ace between the other end of sai iston an the other end of the provided with a pair of spaced valve c mounted in each of said chambers, conduits connecting each of said valve chambers with both of said longitudinally extending con+ -dui'ts, means for admitting fluid under pressure to said cylinder between the ends of said piston, means for confining said fluid between the ends of said piston, and passages controlled by said valves for connecting said longitudinallyextending conduits with the space between the endseof said piston and the s aces between the ends of said piston and t 0 ends of said cylinder.

11. An operatlng motor of the lfind described comprising a cylinder and piston, means for connecting said piston with the throttle valve of the locomotive, said piston being provided with two longitudinally exambers, a valve tending conduits, one of said conduits communicating with the space between one end of said piston'and the adjacent end of the cylinder, and the other of said conduits communicatlng with the space between the other end of said piston and the other end of the cylinder, said pistonbeing provided with a pair of spaced valve chambers, a valve mounted in each of said chambers, conduits connectin each of said valve chambers with both of sai longitudinally extending conduits, means for admitting fluid under pressure to said cylinder between the ends of said piston, means for confining said fluid between the ends of said piston, and passages controlled by said valves for connecting said longitudinally extending conduits with the space between the ends of said piston and the spaces between the ends of said piston and the ends of said cylinder, and a manuall operable means for selectivelyactuating eit er of said valves. p

12. An operating motor of-the kind described oom rising a cylinder and a hollow double hea ed piston having an annular peripheral recess at an-intermediate portion thereof and having an internal s ace constituting an exhaust passage for'fluid, said piston being mounted for reciprocation therein, means for introducing fluid under pressure to said cylinder between the ends of said piston, means for preventing leakage of said fluid past the ends of said piston and for confining said fluid in an annular space defined between said iston and cylinder, a pair of spaced valve 0 ambers carried by said piston, conduits connecting said valve chambers with said annular ,s ace and with the spaces defined between t e ends of said piston and the ends of said cylinder, a separate and independent valve of the poppet type mounted I in each of said valve chambers and manually operable means for selectively actuating either of said valves.

13. An operating motor of the kind described comprising a cylinder and a piston mounted for reciprocation therein, means for introducing fluid under pressure to said cylinder between the ends of-said iston, means for preventing leakage of said uid past the ends of. said piston and for confining said fluid in an annular'space defined between said piston and cylinder, a pair of spaced valve chambers carr ed by said piston, conduits connect-. ing said valve chambers with said annular space and with the spaces defined between the ends of said piston and the endsiof said'cylinder,1a valve mounted in each ofsaid valve chambers, a manually operable control having a portion interposed between said. valves so-that movement of said-control in one direction will actuate one of said valves so as to admit fluid under pressure into the space between one end of said piston and the adjacent end of said cylinder and thereby promy hand.

duce a movement of said piston in the same direction as the movement'of said manual control.

14. An operating motor of the kind decribed comprising a cylinder and a piston mounted for reciprocation therein, means for introducing fluid under pressure to said cylinder between the ends-of said piston, means for preventing leakage of said fluid past the ends of said piston and for confining said fluid in an annular space defined between said piston and cylinder,'a pair of spaced valve chambers carried bysaid piston, conduits connecting said valve chambers with said 'annular space and with the spaces defined between the ends of said piston and the ends of said cylinder, said valves having a clearance to permit a leakage of fluid from said annular space through said conduits to the spaces between the ends of said piston and the ends of said cylinder, said conduits including branches under the control of said valves for establishing communication to the atmosphere and a manually operable control for selectively actuating either of said valves,

each of said valves when actuated by said control permitting the, free passage of fluid under pressure from said annular space to the space between one end of said piston and the adjacent endvof the cylinder and simultaneously venting to atmosphere the space between the opposite end of said piston and its adjacent cylinder end.

In testimony whereof, I have hereunto set ARTHuR WILLIAMS.