US317475A - John b - Google Patents

Description

(No Model.) 1

' ,Y J. B; SUTHERLAND.`

VALVE GEAR.

Pza/sented May 5. 1885.

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' of Syracuse, in the county of Onondaga, in the UNITED STATES JOHhT B. SUTHERLAND, OF SYRAOUSE,

NEW Yoan, AssieNon or cnn-HALE TO GEORGE A. PORTER, OF SAME PLACE.

VALVE-GEAR.

SPECIFICATION forming part of Letters Patent No. 317,475, dated May 5, 1885'.

Application filed December A27, 1884` (Xo model.)

T0 a/ZZ whom, it may concern: Be it known that I, JOHN B. SUTHERLAND,

State of New York, have invented new and useful Improvements in Valve-Gear, of which the following, taken iii-,connection with the accompanying drawings, is a full, clear, and exact description.

In said drawings, Figures I an d II are respectively front and side elevations of my in vention Fig. III, a top view of the bracket or pedestal which supports the moving parts of my invention. Fig. 1V is a transverse section on line X X,Fig1; and Fi g. V is avertical section of the slide which moves in a guide-groove in the stationary standard and supports the rocky arm.

Similar letters of reference indicate correspondin g parts. v

This invention relates to the class of steam cutoft's in which motion is transmitted from the eccentric-rod to the valve by-.means of a rock-arm whose fulcrum is movable longitudinally thereon and regulated in its position by the governorspindle connected directly with said fulcrum.

My invention consists in an improved construction and combination of parts, all as hereinafter more fully described, and specifically set forth in the claims.

O represents the valve-stem, which is connected with the valve of the engine, (not shown in the drawings), and E denotes the usual l eccentric-rod which receives a reciprocating motion from an eccentric attached to the driving-shaft, and usually transmits motionvto the valve-stem by the medium ot a link or rockarm,A the latter being in some instances mounted movably on itsfulcrnm and arranged to be controlled in its position by the engineer in charge, asis the case on locomotives, .where the link is carried by and between two eccentric-rods and slides on a fulcrum affixed to a rock-arm which transmits motion to the valvestem. Byraising and lowering the link on its fulcrum the engineer varies the movement of the valve-stem at will. l

My invention diiiers from the aforesaid combination and arrangement of parts, chieiy, in that the fulcrum is moved on the rock-arm automatically by the governor-spindle, thus rendering the action ot the valve-stem self-regulating.

To accomplish this in a positive and reliablemanner, and by simple, compact, efiicient, 5 5 and'adjustable means, l rigidly secure to the engine-bed, or to some other iirm support, a bracket or pedestal consisting of an upright plate, A, which is bolted to the support, and

a plate, A', bolted at one end to the part A, 6o

and formed with an offset to bring its free end some distance from and parallel with the plate A. The two plates A and A are each provided with a verticalslot, b, and the upper portion ot' the plate A has a groove, a', in the 65 form of a segment described from the center of the slot b aforesaid. In said groove moves longitudinally a segmental slide, S, to which is connected the valve-stem C by the medium of a link or strap, C', which is pivoted at op- 7o posite ends, respectively, on the slide and on the end of the valve-stem, as shown in Fig. I of the drawing. On the pin which connects the link C with the' slide is hung, by one of its ends, a rock-arm, It, which is thus connected with both the slide and valve-stem. Said rock-arm is extended through the space between -the two plates A A of the bracket, and has connected to its opposite end the eccentric-rod E. That portion of the rock-arm 8o which lies between the plates A A is provided with a longitudinal slot, t, and in the two slots b b of the bracket and slot t of the rock-arm slide boxes o' r, through which is extended a bolt, c, constituting the fulcrum on which the rock-arm turns. To the extremities of the bolt c are attached two vertical rods, c c, which are guided and sustained in a vertical position by one of said rods sliding in a groove, f, in the back of the upper portion of the plate Vgo A. The upper ends of the rods c c are screwthreaded and indirectly connected with each other by a cross-bar, g, which is provided in its two ends with eyes, by which it is slipped onto the ends ot' the rods. By means of nuts u n 95 on the rods above and below the cross-bar the latter is sustained adjustably in its position and adapted to be raised or lowered as may be necessary to obtain the desired effect from the governor, presently explained.

Gr denotes a comm on steam-engine governor, which, owing to the want of room, is shown IOO on a reduced scale. It comprises vertically vibratory gravitating arms, which are made to swing about a vertical spindle by rotary motion, transmitted to the support of said arms from a rotary shaft in the usual and Wellknown manner, said governor-arms being connected with the vertical governor-spindle G by links m m in such a manner as to cause said spindle to be moved vertically by the vertical vibration of the governor-arms, incident to the centrifugal force produced by their swinging movement about the governorspindle. The governor being secured to a trm support above the cross-bar g, hereinbefore described, the lower end of the spindle lpasses through a hole in the saidcross-bar g, and is screw-threaded for the reception of nuts n' n' above and below said cross-bar.

The operation of my invention is as follows: When the en gine is at rest and the governorarms in their normal position, the governorspindle l is depressed, and by the medium ofthe cross-bar g and rods c c, pushes down the i'ulcrum e to the lower ends of the slots b b and t, respectively, of the bracket A A' and rock-arm R, the valve-stem thus being allowed its maximum stroke to freely admit steam to the cylinder when starting the engine. As the engine gains in velocity, the governor-arms are thrown outward by the increased ccntrit'ugal force exerted on said arms,

thereby causing the governor-spindle l to draw up the fulcrum e by means of the rods c c and cross-bar g. The aforesaid movement of said fulcrum carries it toward that end of the rock-arm which is connected with the valve-stem, and correspondingly increases the distance from the fulcrum to the end of the rock-arm to which the eccentric is connected, and therefore diminishes the stroke of the valve-stem. The resultant check of the ilow of steam to the cylinder reduces the speed of the engine, and causes the governor-arms to gradually descend until they have pushed the governor-spindle down suiiciently to bring the fulcrum e in such relative position on the rock-arm as to again afford to the valve-stem a stroke which prevents further reduction of the speed of the engine.

stem, andeccentric-rod, the'bracket A A', secured stationary in its position and, provided with the guide-groove a and slots b b, the slide S, moving in the groove a and having connected with it the valvestem,the rock-arm It, connected at one end with the valve-stem, and at the opposite end with the eccentric-rod and provided with the slot t, the fulcrum e, sliding in the slots t and b b, and the governor-spindle connected with said fulcrum, substantially as set forth and shown.

2. In combination with the governor, valvestem, and eccentric-rod, the bracket A A', secured stationary in its position and provided with the segmental guide-groove a and vertical slots b b, the segmental slide S, moving in the groove a, the link C', connecting the valvestem with said slide, the rock-arm It, connected at one end with the slide at the attachment of the link and having connected to its opposite end the eccentric-rod and provided with the slot 1,-the fulcrum e, sliding in the slots t b b, and the governorspindle connected with said fulcrum, substantially as described and shown.

3. In combination with the governor, valvestem, and eccentric rod, the bracket A A', secured stationary in its position and provided with the segmental groove a and vertical slots b b and f, the segmental slide S, moving in groove a, the link C', connecting the valvestem with the slide, the rock-arm R, connected at one end with the slide at the attachment of the link and having connected to its opposite end the eccentric-rod and provided with the slot t, the fulcrum e, sliding in the slots t b b, the rods c c, connected at one end with the fulcrum e and guided in the groove f and screw-threaded at the opposite end, the crossbar g, connecting the rods 0 c, nuts n n, for adjustably sustaining the cross-bar on said rods, the governor-spindle having its end screw-threaded and passing through the crossbar g, and nuts n' n' for adjustably connecting the governor-spindle with the said cross-bar, all constructed and combined to operate substantially inthe manner specified and shown.

In testimony whereof I have hereunto signed l my name and aiixed my seal, in the presence roo IOS

The described action of the governor-spinl of two attcsting witnesses, at Syracuse, in the dle on the fulcrum e can be properly adjusted l county of Onondaga,in the State ofNewYork, by shortening or lengthening the connection this llth day of December, 1884.

of said parts, which is eiected by means of the nuts a n and a' n', hereinbefore described. l Having described my invention, what I y claim as new, and desire to secure by Letters ,l Patent, isi l. ln combination with the governor, valve- JOHN B. SUTHERLAND. [L

Witnesses: Y

STEWART WORDEN, W. F. JoNEs.

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