USRE14014E - Steam-engine valve-gear - Google Patents

Description

Reissued Nov'. 23,1915.

14,014. Z SHEETS-SHEET 1.

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STEAM ENGINLVALVE GEAR.

APPLICATION FILED SEPT.2I. l9l5. Reissued Nov. 23,1915.y A 14,014.

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UNITED STATES PATENT oEErcE.

WILLIAM SHERMAN BROWN, OF KNOXVILLE, TENNESSEE, ASSIG'NOR, BY MESNE ASSIGNMENTS, T SOUTHERN LOCOMOTIVE VALVE GEAR COMPANY, A CORPO- NATION or* TENNESSEE.

STEAM-ENGINE VALVE-GEAR. i

Specification of Reissued. Letters Patent. Reissued NOV. 23, 1915.

Original No. 1,100,668, dated June 16, 1914, Serial No. 766,876. Application for reissue filed September 21,

T0 all whom t 'may concern f Be it known that I, WILLIAM SHERMAN BnowN, a citizen of the United States, re-

i siding at Knoxville, in the county of Knox and State of Tennessee, have invented a new and useful Improvement in Steam-Engine Valve-Gears, of which the following is a specification, reference being had to the accompanying drawing.

My improvement relates particularly to mechanism for transmitting motion from the crank of a drive wheel of a steamlocomotive to the distributing valve which admits steam to the cylinder.

The object of the improvement is to provide a construction which is simple, has the parts accessibly located, and which avoids irregularity of valve action due to lost motion or pounding at the crank.

This improvement is applicable to the mechanism described by my United States Patent No. 1,033,532, granted July 23, 1912, for f Steam-engine valve gear.

In the accompanying drawings, Figure 1 is a side elevation, portions being broken away, showing my improvement applied -to one side of a locomotive; Fig. 2 is a plan of a portion of the mechanism shown by Fig. 1; Fig. 3 is a section on the line, 3 3, of Fig. 2, looking toward the right; Fig. 4 is a section on the linea-4, of Fig. 2, looking in the direction of the arrow; Fig. 5 is a plan of thev bridge upon which the segment is seated; Fig. 6 is aside 'elevation of said bridge; Fig.

position and movements of the bell crank.

Referring to said drawings, 1, is the usual valve stem extending vto the distributin valve (not shown). parallel cross-head guide bars, 2, are supported at their rear'ends bythe guide yoke extension, 3.' The usual connecting rod or pitman, 4, iscoupled to the usual main crank, 5, carried by a drive wheel, D. On' the main crank, 5, is rigidly mounted an auxiliary crank, 6, standing 90 degrees for- -is a section' on the line, V7--7, of Fig. 1. looking toward the left; Fig. 8 isV a plan of the hanger; Fig. 9 illustratesV the arms, 17, and a depending arm, 18. The lat- The usual horizonta Serial No. 51,894.

ward of the main crank. To said auxiliary crank is coupled one end of the auxiliary pitman rod, 7.

A bridge, B, is located above the frame, A, andextends from 'the ordinary guideyoke, 8, and guide-yoke extension, 3, to the cross beam or plate, 10, and is secured to said guide-yoke and to said cross-beam by means of bolts, 9. Said bridge is in the form cf a plate having its length horizontal and being turned to bring its long edges into an upright plane. At its rear end, the bridge has a lateral extension, 11, resting against the cross-beam, 10, Vand receiving said bolts, 9. At its forward end the bridge has a transverse extension, 12, reaching to both sides of the body of the'bridge and resting against the guideyoke, S, and the guide yoke extension, 3, and receiving said bolts, 9. The innermost of said bolts extends through the transverse extension, 12, and the guide yoke, 8, while the others of said bolts extend'through the transverse extension, 12, and through the guide yoke, 8, and the guide yoke extension, 3. On the outer portion of the transversevextension, 12, and integral therewith is an ear, 13, which is directed rearward; and on the inner portion of said transverse extension is another ear, 14:, also directed rearward and located horizontally opposite the ear, 13'. Each of said ears has a bearing, 15, receiving the ends of Ya sha-ft,'16. On said shaft is a bell crankor rocking member, C, preferably rotatable on said shaft, the latter being held immovably in its bearings. Said bell crank has two approximately horizontal ter arm is coupled to the valve-stem, 1. By rocking the bell crank, the valve stem is reciprocated.

An approximately upright link, 19, has

its upper end coupled to the arms, 17, of the bell crank, while itslower end is coupled to the forward end of the auxiliary pitman rod, 7, both ends of said link being forked to receive said rod'and said arms, as shown in ,the drawings. Said arms, 17, are also forked to receive the upper ends of the link, 19. On the upper edge of the bridge, B, are horizontal bosses, 20. A. hanger, H, has a lateral upper flange, 21, extending. across the bridge, B, and secured thereto by bolts, 22, extending through said flange and the bosses, 20, and horizontally through the hanger and the bridge. On said hanger is a bearing box E. Said box receives a short rock shaft, 23, which is horizontal and transverse to the bridge and the frame, A. On the outer end of said shaft,V 23, is a rocking member or arm, 24, directed upward and having on its upper end a horizontal wrist, An approximately upright link, 26, has its upper end coupled to said wrist while its lower end is coupled, by means of a bolt, 27, toV the` auxiliary rod' between the link, 19, and the auxiliary crank, 6, at a point which is substantially in alinement with the axis of said rock shaft, 23, when the auxiliary crank is on the upper or lower quarter, the hanger, H, bringing theV axisofv the rock-shaft tothe proper height to effect such alinement.

TheV forward end of the auxiliary reach rod 28, is coupled to the upper end of the vof said auxiliary reach rod is cou-pled to the upright arm, 29, which is rigid on thereversing shaft, 30, supported in bearings, 31. On said reversing shaft i's` an arm, 32, to which is coupled a rod, 33, which is in turn coupled' to the ordinary reversing lever, 34, working on a sector or quadrant,

In operation, the rocking arm, 24, is set to bring its upper end into any desi-red position in its curved path (the `axis of which path is, theaxis of the shaft, 23), this being done by means of the reversing liever. The setting of the rocking member in such position carries vthe upper end of the lfink, 26,

along said curved path into theV s ame posilink, 19, is forced up and down, and suchv movement of said link causes the rocking of the bell crank C, and the reciprocation ofv the valve stem, 1. The gear is reversed' by throwing the reversing leverl across the center in the usual manner, and' the opening of the valve is varied by moving the upper end f of the rocking member or arm, 24, nearer to or farther from the upright plane in which lies the axis of the rock-shaft, 23, this being accomplished by the aid of suitable notches (not shown) on the reversing lever sector. WV hen the upper end of the rocking member or arm, 24, is on the middle of its curved path (in said upright plane), the valve motion is reduced to the extent of the lead. The holes through which the bolts, 22, extend are larger than the diameter of said bolts, in order to allow some shifting of the hanger before tightening said bolts. Inv this way, horizontal adjustment of the hanger and the axis of the rocking member or arm, 24, may be made. Upward adjustment of said axis may also be made by placing any suitable filling piecey or pieces between the flanges, 21, and the upper edge of the bridge.

TheY drawings have been` copied in part from larger working drawings used in applying my' improvement to a railway freight locomotive having a pistonA stroke of 30 inches and having a maximum valve travel of inches and a lead of three-sixteenths ofV an inch. The radius of the auxiliary crank, 6, (measuring fromy the driver axis) is 8 and inches. The distance from the auxiliary crank along the auxiliary pitman rod, 7, to the axis of the bolt, 27, is 74 and 3/32 inches. From the latter point on said pitman rod tothe link, 19, is 10 and 13/32 inches. rFhe length of' the link, 26, is 35 and 11/16 inc-hes, and that, as already described, is also. the length of the rocking arm., 24'. The axis of the bolt, 27, is one and five-sixteenths inch-es below the level of the driver axis and the cylinder axis (the working line or center line ofmotion). The length ofthe link, 19, is inches. The height of the axis or fulcrum of the bell crank or rockin-g member, C, above the level of the center line of motion is 32 and 2/8 inches. The length of the arms, 17 and 18, of the bell crank is 12 andv Jg inches. The rocking member, C, is not a true bell crank, its angl-e being less than ninety degrees-72 degrees.

Vhen the engine is in forward motion and' the main crank is onA the back center and the auxiliary crank on the upper quarter, the arm, 18, is 2 and J2- degrees back of' a vertical line cutting the fulcrum, and the arms;` 17, are 15 and degrees below a horizontal line cutting the fu'lcrum. When the arm, 24, is set for full valve travel (5 and 15 inches), the forward` travel of the arm, 18, from the position mentioned is 7 and degrees and the back travel of said arm from said position is 19 degrees, and the arms, 17, travel downward and upward correspondingly; Thus thev larger portion of the travel of the rocking member armsV is within the 90 degree angle formed by said vertical and said horizontal lines.l These relativeproportions and positions of the various parts of the mechanism produce the desired quick movement of the valve during the opening and closing and also produce equalized travel of the valve over the port during the forward motion and during the backward motion.

It is to be observed that my improvement eliminates from the valve mechanism the eccentric and also all parts having a highV velocity. No part of the valve mechanism is connected to the connecting rod nor the cross-head. Movementis transmitted t0 the valve stem from the wrist of theV auxiliary crank and said wrist travels in a relatively small circle. Thus the movement of the auxiliary rod and the links, 19 and 26, are through relatively short ranges. Furthermore, it is to be noted that lost motion due to wear at the wrist of the auxiliary crank will chiey modify the lengthwise moveV` ment of the auxiliary pitman, 7, while the movement transmitted through the link, 19, is approximately at right angles to said auxiliary pitman. Hence the modification of the longitudinal movement of said pitman is substantially notr transmitted to said link. And it will be seen that such modiication of the rocking movement of the auxiliary pitman due to wear at the wrist of the auxiliary crank will aiiect the link, 19, in minimized form, because the portion of the auxiliary pitman between the axis, 27, and the link, 19, is much less than between said axis and the wrist of the auxiliary crank. In this connection it is to be remembered that wear by the auxiliary crank Wrist in the auxiliary pitman is chiefly in the di? rection of the length of said pitman. Such wear produces what is termed lost motion or pounding at the crank.

I claim as my invention:

1. In a steam engine valve gear, the combination of a rocking member, a reversing lever in operative relation with said rocking member, an auxiliary crank, an auxiliary rod having one end coupled to said crank, and approximately upright link coupled to said auxiliary rod between its ends and at a point which is substantially in alinement with the axis of said rocking member when the auxiliary crank is on the upper quarter or the lower quarter, .and said link having its upper end coupled to the free portion of said rocking member, and means Y connecting the outer end of saidv auxiliary rod into operative relation with the stem of the distributing valve, substantially as described.

2. In a steam engine valve gear, the com bination of a rocking member extending upward from its axis, a reversing lever in op erative relation with said rocking member,

an auxiliary crank, anv auxiliary rod having one end coupled to said crank, an approximately upright link coupled to said auxiliary rod between its ends and at a point which is substantially in alinement with the axis of said rocking member when the aux'- iliary crank is on the upper quarter or the lower quarter and said link having its upper end coupled to the free portion of said rocking member, and means connecting the outer end of said auxiliary rod into operative relation with the stem of the distributing valve, substantially as described.

3. In a steam engine valve gear, the combination of a rocking member, a reversing lever in operative relation with said rockin'g member, an auxiliary crank, an auxiliary rod having one end coupled to said crank, an approximately upright link coupled to said auxiliary rod between its ends and at a point which is substantially in alinement with lthe axis of said rocking member when the auxiliary rod is on the upper quarter or the lower quarter and said link having its upper end coupled to the free portion of said rocking member, and a bell crank in operative relation with the outer end of said auxiliary rod and with the stem ofthe distributing valve, substantially as described. f

In a steam engine valve gear, the combination of a rocking member extending upward from its axis, a reversing lever in operative relation with said rocking member, an auxiliary crank, an auxiliary rod having one end coupled to said crank, an approximately upright link coupled to said auxiliary `stantially as described.

5. In a steam engine valve gear, the combination of a rocking member, a reversing lever in operative relation with said rocking member, an auxiliary crank, an auxiliary rod having one end coupled to said auxiliary rod between its ends and at a point which is substantially inv alinement with the axis of said rocking member when the auxiliary crank Ais on the upper quarter or the lower quarter, and a bell crank having its arms at an angle of less than ninety degrees, and one of said arms being in operative relation with the outer end of the auxiliary rod and the other arm being in operative relation with the stem of the distributing valve, substantially as described.

6. In a steam engine valve gear, the combination of a hanger, a rocking member supported by said hanger, a reversing lever in operative relation with said rocking member, an auxiliary crank, an auxiliary rod having one end coupled to said crank, an approximately upright link coupled to said auxiliary rod between its ends and at a point which is substantially in alinement with the axis of said rocking member when the auxiliary crank is on the upper quarter or the lower quarter, and said link having its upper end coupled to the free portion of said rocking member, and means connecting the outer end of said auxiliary rod into operative relation with the stem oit' the distributing valve, substantially as described.

7.'In a steam engine valve gear, the combination of an adjustable hanger, a rocking member supported by said hanger, a reversing lever in operative relation with said rocking member, an auxiliary crank, an auxiliary rod having one end coupled to said crank, an approximately upright link coupled to said auxiliary rod between its ends and at a point which is substantially in alinement with the axis of said rocking member when the auxiliary crank is on the upper quarter or the lower quarter, and said link having its upper end coupled to the free portion of said rocking member, and means connecting the outer end of said auxiliary rod into Aoperative relation with the stem of the distributing valve, substantially as described.

8. In a steam engine valve gear, the combination or a bridge supported by the main frame, a rocking member supported by said bridge, a reversing lever, in operative rela# tion with said rocking member, an auxiliary crank, an auxiliary rod having one end coupled to said crank, an approximately upright link coupled to said auxiliary rod between its ends and at a point which is substantially in alinement with theaxis of said rocking member when the auxiliary crank is on the upper quarter or the lower quarter, and said link having its upper end coupled to the free portion of said rocking member,

and means connecting the outer end of said auxiliary rod into operative relation with the stem of the distributing valve, substantially asA described.

9. In a steam engine valve gear, the com bination of a bridge supported by the main frame, a hanger on said bridge, a rocking member supported by said hanger, a revers ing lever in operative relation with said rocking member, an auxiliary crank, an auxiliary rod having one end coupled to said crank, an approximately upright link coul pled to said auxiliary rod between its ends and at a point which is substantially in alinement with the axis of said rocking member when the auxiliary crank is on the upper more quarter or the lower quarter, and said link having its upper end coupled to the freev v portion of said rocking member, and means connecting the outer end of said auxiliary rod into operative relation with the stem of the distributing valve, substantially asA described.

10. In a steam engine valve gear, the combination of a bridge supported by the main frame, a hanger adjustable on said bridge, a rocking member on said hanger, a reversing lever in operative relation with said rocking member, an auxiliary crank, an auxiliary rodv having one end coupledto said crank, an approximately upright link coupled to said auxiliary rod between its ends and at a' point which is substantially in alinement with the axis of said rocking member when the auxiliary crank is on the upper quarter or thelower quarter, and said link having its upper end coupled to the free portion of said rocking member, and means connecting the outer end of said auxiliary rod into operative relation with the stem of the distributing valve, substantially as described.

A11. In a steam engine valve gear, the coinbination of a hanger, a rocking member supported by said hanger, a reversing lever in operative relation with said rocking member, an auxiliary crank, an auxiliary rod having one end cou-pled to said auxiliary crank between its ends and at a point which is substantially in alinement with the axis ofv said rocking member when the auxiliary crank is on the upper quarter or the lower quarter, and. said link having its upper end coupled to the tree portion of said rocking member, and a bell crank in operative relation with, the outer end of said auxiliary rod and with the stem of the distributinor valve, substantially as described.

12. In a steam engine valve gear, the combination of an adjustable hanger, a rocking member supported by said hanger, a reversing lever in operative relation with said rocking mem aer, an auxiliary crank, an auxiliary rod having one end coupled to said crank,an` approximately upright link cou-` pled to said auxiliary rod between its ends and at a point which is substantially in alinement withY the axis of said rocking member when the auxiliary crank is on the upper quarter or the lower quarter, and saidlink having its upper end coupled to the free portion oie said rocking member, and a bell crank in operative relation with the outer end of said auxiliary rod and with theJ stem of the distributing valve, substantially as described.

13. In a steam engine valve gear, the combination of a bridge supported by the main frame, a rocking member supported by said bridge, a reversing lever in operative lrelation with said rocking-member, an auxiliary llo crank, an auxiliary rod having one end coupled to said crank, an approximately upright linkr coupled to said auxiliary rod bethe outer end of said auxiliary rod and with the stem of the distributing valve, substantially as described.

14. In a steam engine valve gear, the combination of a bridge supported by the main frame, a'hanger on said bridge, a rockingv member supported by said hanger, a reversing lever in operativefrelation with 'said rocking member, an auxiliary crank, an auxiliary rod having one end coupled to said crank, an approximately upright linkv coupled to said auxiliary rod between its ends and at a point which is substantially in alinement with the axis of said rocking member when the auxiliary crank is on the` upper quarter or the lower quarter, and'said I link having its upper end coupled to the free portion ofv said rocking member, and a bellcrank in operative relation with the outer end of said auxiliary rod and with the stem of the distributing valve, substantially as described.

15. In a steam engine valve gear, the combination of a bridge supported by the main frame, a hanger adjustable on said bridge, a rocking member on said hanger, a reversing lever in operative relation with said rockingy member, an auxiliary crank, an auxiliary rod having one end coupledto said crank, an approximately.` upright link coupled to said auxiliary rod between its ends and at a point which is substantially in alinement with the axis of said rocking member when the auxiliary crank is on the upper quarter or the lower quarter, and said link having its upper end coupled to the free portion ofsaid rocking member, and a bell crank in operative relation with the outer end of said auxiliary rod and with the stem of the distributing valve, substantially as described.

16. In a steam engine valve gear, the com-V bination of a bridge, a hanger having an upper flange extending across said bridge, a rocking member on said hanger, a reversing lever in operative relation with said rocking member, an auxiliary crank, an auxiliary rod having one end coupled to said crank` an approximately upright link coupled to said auxiliary rod between its ends and at a point which is substantially in alinement with the axis of said rocking member when the auxiliary crank is on the upper quarter or the lower quarter, and said link having its upper end coupled tothe free portion -of said rocking member, and means connecting the outer end of said auxiliary rod into operative vrelation with the stem of the distributing valve, substantially as described.

17 In a steam engine valve gear, the combination of a rocking member, a ,reversing lever, a reversing shaft in operative relation with said reversing lever and with said rocking member, an auxiliary crank, an auxiliary rod having one end coupled to said crank, an approximately upright link coupled to said auxiliary'rod between its ends and at a point which is substantially in alinement with the axis of said rocking member when the auxiliary crank is on the upper quarter or the lower quarter, and said link having' its upper end coupled to the free portion of said rocking member, and means connecting the outer end of said auxiliary rod into operative relation with the stem of the distributing valve, substantially as described.

18. In a steam engine valve gear, the combination of a hanger, a rocking member on said hanger, a reversing lever, a reversing shaft in operative relation with said reversing lever and with said rocking member, an auxiliary crank, an auxiliary rod having one end coupled to said crank, an approximately upright link coupled to said auxiliary rod between its ends andat a point whichris substantially in alinement with the axis of said rocking member when the auxiliary crank is on the upper quarter or the lower quarter, and said link having its upper end coupled to the free portion of said rocking member, and means onnec'ting the outer end of said auxiliary rod into operative relation with the stem of the distributing valve, substantially as described. Y

19. In a steam engine valve gear, the combination of a bridge supported by the main frame, a rocking member 'supported by said bridge, a reversing lever, a reversing shaft inoperative relation with said reversing'lever and with said rocking member, an auxiliary crank, lan auxiliary rod having one end coupled to said crank, an approximately upright link coupled to said auxiliary rod between its ends and at a point which is substantially in alinement with the axis of said rocking member when the auxiliary crank is on the upper quarter or the lower quarter,- A

and said link having its upper end coupled to the free portion of said rocking member, and means connecting the outer end of saidl With said reversing leverV and with said rocking member, an auxiliary crank, an auxiliary rod havin@r one end coupled to said crank,

an approximately upright link coupled to Vsaid auxiliary rod between its ends and at a point which is substantially in alinement with the axis of said rocking member when by, a pivoted arm carried by the support, an l auxiliary'connecting rod, means for transmitting motion to the rod, a connection .piv-y Oted to the rod and to the arm, and means for connecting the rod to the valve for the operation thereof. f

22. A valver gear comprising, in combination, a frame, an arm support carried thereby, a pivotedfarm carried by the support, an auxiliary connecting rod,r means for transmittingA motion to the rod, a connection pivoted to the rod and to the arm, and means for connecting the rod to the valve for the operation thereof, said frame and said arm support being disposed for relative movement and provided with means for securing them in predetermined position. 23. A valve gear comprising, in combination, a frame, an arm support carried thereby, a pivoted arm carried by the support, an auxiliary connecting rod, means for trans.-

mitting motion to the rod, a connection pivoted to the rod andto the arm, and means for connecting the rod to the valve for the operation thereof, one of said frame and said-arm support members being provided with an elongated aperture and the other with Vmeans engaging therewith whereby they may be secured in*` predetermined posi'- tion. f y

Q4. A valve gear comprising, in combination, a frame, an arm support carried thereby, a pivoted arm carried by the support, an auxiliary connecting rod, means for transmitting motion to the rod, a connection4 pivoted to the rod and to the arm, and means for connecting the rod to the valve for the operation thereof, one of4 saidV frame and said arm support members being provided with a threaded bolt and the other with a threaded portion engaging therewith whereby the relative relation of the support and the frame may be varied.

25. Ak valve gear comprising, in combination, a frame, an Aarm support carried there- K by, a pivoted arm carried by the support, an auxiliary connecting rod, means for transmitting motion to the rod, a connection piv-` oted to the `rod and to the arm, and means for connecting the rod to the valve for the operation thereof, said frame and said armr support members being provided with means for .varying their relation vertically.

26. A valve gear comprising, in combination,-a frame, an arm support carried thereby, a pivoted arm carried by the support, an auxiliary connecting rod, means for trans-- mitting motion to the rod, aconnection pivoted to the rod andto the arm, and means for connecting the rod to the valve for the operation thereof, said frame and said arm support members being-provided with means for varying their relation horizontally.

27. A valve gear comprising, in-combination, a frame, an arm support carried thereby, a pivoted arm carried by the support, an auxiliary connecting rod, means for transmitting motion to the rod, a connection pivoted to 4the rod and to the` arm, and means' for connecting the rod to the valve for the operation thereof, said frame'and said arm support means being provided with interposed means for varying their relation vertically. y

28. A valve gear comprising, in combination, a pivoted arm, an auxiliary connecting rod, means for transmitting motion to the rod, a connection pivoted to the rod and to the arm, and means for connecting the rodA to lthe valve for the operation thereof. Y

29. A valve gear comprising, in combination, a movable support, means in operative relation thereto for moving the support, an auxiliary rod, means for transmitting motion to the rod, a connection pivoted to the rod and forming a fulcrum therefor, and pivoted tothe support, means for connecting the rod to the valve for the operation thereof, and means for varying the position of the fulcrum fvertioally.

30. A valve gear comprising, in combination, a movable support, means in operative relation thereto for moving the support, an

auxiliary rod, means Vfor transmitting mo-V tion to the rod, a connection' pivoted to the support, means for connecting the rod to the valve for the operation thereof, and means for varying the position of the fulcrum vertically relatively to a horizontal line coincident with the axis of the means for transmitting motion. p

31. A valve gear comprising, in combination, a movable support, means in operative relation thereto for moving'the support, an auxiliary rod, mea-ns for transmitting motion to the rod, a connection pivoted to the rod and forming a fulcrum therefor, and i pivoted to the support, means for connecting the rod to the valve for the operation thereof, and means for varying the position of the movable support vertically.V

32. 'A valve gear comprising, in combinathe rod to the valve for the operation thereof, and means for varying the position of the movable support vertically relatively to a horizontal line coincident with the axis of the means for transmitting motion.

33. A valve gear comprising, in combination, a movable support, means in operativeV relation thereto for moving the support, an auxiliary rod, means for transmitting motion to the rod, a connection pivoted to the rod and forming a ulcrum therefor, and pivoted to the support, means for connecting the rod to the valve for the operation thereof, and means for varying the position of the movable support horizontally.

34. A valve gear comprising, in combination, a movable support, means in operative relation thereto for moving the support, an auxiliary rod, means for transmitting motion to the rod, a connection pivoted to the rod and forming a fulcrum therefor, and pivoted to the support, means for connecting the rod to the valve for the operation thereof, and means for varying vertically the pivot point of said support on said connection relatively to said fulcrum.

35. A valve gear, comprising, in combination, a movable support, means in operative relation thereto for moving the support, an auxiliary rod, means for transmitting motion to therod, a connection pivoted to the rod and forming a fulcrum therefor, and pivoted to the support, means for connecting the rod to the valve for the operation thereof, and means for varying horizontally the pivot point of said support on said connection relatively to said fulcrum.

36. A valve gear comprising, in combination, Aa frame provided with an arm support movable relatively thereto, an upwardly disposed rocker arm pivoted in said support, means for moving the upper end of said arm, an auxiliary rod,- means for transmitting motion to the rod, a fulcrum link pivoted to the rod and to the upper portion of the rocker arm, a pivoted bell crank for operating the valve, a connecting link for transmitting motion from the rod to the bell crank, and means for varying the relation of the fulcrum point of said first mentioned link relatively to the pivot point of said bell crank.

37. A valve gear comprising, in combination, a frame lprovided with an arm support movable relatively thereto, an upwardly disposed rocker arm pivoted in said support, means for moving the upper end of said arm, an auxiliary rod, means for. transmitting motion to the rod, a fulcrum link pivoted to the rod and to the upper portion of the rocker arm, a pivoted bell crank for operating the valve, a connecting link for transmitting motion from the rod `to the bell crank, and means for varying the relation of the rocking axis of said rocker arm relatively to the pivot point of said bell crank.

38. A valve gear comprising, in combination, a frame provided with an arm support movable relativelythereto, an upwardly disposed rocker arm pivoted in said support, means for moving the upper end of said arm', an auxiliary rod, means for transmitting motion to the rod, a 'ulcrum link pivoted to the rod and to the upper portion of the rocker arm, a pivoted bell crank for operating the valve, a connecting link for transmitting motion from the rod'to the bell crank, and means for varying the relation of the pivot point of said rocker arm and fulcrum link relatively to the pivot point of ySaid bell crank.

39. In a locomotive valve gear, the combination of a reversing mechanism comprising a support movable in an arc, a bell crank in operative relation with the distributing valve and having an angle less than ninety degrees, to Wit, approximately seventy-two degrees, an auxiliary rod, means for actuating said rod, and two approximately upright links each having its lower end coupled to the auxiliary rod and one having its upper end coupled to said support and the other having its upper end coupled to the bell crank, substantially as described.

40. In a locomotive valve gear, the combination of a reversing mechanism comprising a support movable in an arc, a bell crank in operative relation with the distributing valve and having its arms standing at an angle of less than ninety degrees to each other and having their movement chiefly within a right angle formed by a vertical and a horizontal line cutting the fulcrum of said bell crank, substantially as described.

4l. In a locomotive valve gear, the combination of a reversing mechanism comprising a support movable in an aro, a bell crank in operative relation with the distributing valve and having an angle less than ninetyT degrees, to wit, approximately seventy-two degrees, an auxiliary crank, an auxiliary .rod coupled to said crank, and two approximately upright links each having its lower end coupled to the auxiliary rod and one having its upper end coupled to said support and the other having its upper end coupled to the bell crank, substantially as described.

42. In a locomotive valve gear, the combination of a reversing mechanism comprising a support movable in an arc, a bell crank in operative relation with the distributing valve vand having its arms standing at an a v varesgoas:

angle ofrless than ninety degrees to each -enol coupled tothe bell crank, substantially other and having their movement chiefly as described. Within a right angle formed by a vertical In rtestimony whereof I have signed my line and avhorizontal line Cutting the fulname, in Apresence oftWo Witnesses, this 31st 5 eruln of the bell crank, an auxiliary crank, day of August, in the year one thousand nine 3 5 an auxiliary rod coupled to said crank, and. hundred and ifteen.

two approximately upright links each 1hav- WILLAM SHERMAN BROWN. ing its lower end Coupled to the auxiliary Witnesses: rod and one having its upper end coupled to CYRUS KEHR,

10 said supporti-and lthe other having its iupper LUGILE ToBLER..

Copies of this patent may Vbe obtained for ve cents each, by addressing the Commissioner vof Patents, WashingtonfDuC.

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