US319737A - Valve-gear - Google Patents

Description

(No Model.)

H. G. MANNING.

VALVE GEAR.

Patented June 9, 1885.

IINi'rn STATES 'ATENT Brion.

HARRY G. MANNING, OFNEWTON, MASSACHUSETTS.

VALVE-GEAR.

SPECIFICATION forming part of Letters Patent No. 319,737, dated June 9, 1885.

Application filed July 1, 1884. (No model.)

To all whom it may concern:

Be it known that I, HARRY G. MANNING, of Newton, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Valve-Gear, of which the following is a specification.

The objects of my invention are to provide a cheap, simple, and efficient valve-actuating mechanism, which shall communicate a quick action to the valve at the commencement of each stroke, so that the steam-port shall be open to its widest extent when the piston of the engine commences its stroke; also, to provide a variable travel for the valve, so that the steam may be cut off at any point in the stroke; also, to provide mechanism whereby the said valve may be actuated so as to permit the engine to be reversed at any point in the stroke. I attain these objects by constructing the valve-gear mechanism as hereinafter more fully described, and set forth in the claims.

Figure 1 represents a side elevation showing a valve-gear mechanism constructed according to my invention, connected with a section of a steam-cylinder and valve with guide-bars, piston, piston-rod, cylinder-head, and cross-head. Fig. 2 represents aplan of a portion of the same, the reversinggear being omitted. Fig. 3 represents an elevation of the driving-cam disconnected. Fig. 4 represents a longitudinal section of the said cam, taken on dotted line, Fig. 3. Fig. 5 represents an elevation of the reversing-cam on a section of the drivingshaft.

In carrying out my invention I construct a cam of the peculiar form shown in Fig. 3, and bolt the same firmly to the cross-head A, and provide a friction-roller, B, pivoted or journaledv upon the end of the rocker-arm O, pivoted at 0, having the rocker-arms D and E, in which the sliding block G moves up and down, one end of the rod F being pivoted to said block G, and the opposite end to the vibrating end of the rocker-arm H, said arm H being connected by shaft H to rocker-arm I, which is pivoted to valve-stem J, connected to valve 1;. The lower end of the hanger-rod K is also pivoted to sliding block G, and the upper end is pivoted to the vibrating end of the arm L of the right-angled rocker-arms M L,

pivoted in the support-block L, the vibrating end of said rocker-arm M being pivoted to rod N, which is pivoted to hand-lever O, pivoted in support-block m. By moving'hand-lever O backward or forward, the sliding block G, and therefore rod F, may be held in any position desired, and the travel of the valve thus controlled.

Surrounding the said roller B is the suspended yoke-frame I, which is connected by the rod Q to the lower end of the coil-spring R, the upper end of which is connected to the lower end of the rod S, pivoted to the vibrating end of the armIof the right-angled rockerarms T U, pivoted in support-block T, the

vibrating end of the arm U pivoted to one end of the rod V, the opposite end of which is pivoted in slidingblock a, which moves up and down in rocking link \V, pivoted in supportblock W, the upper end of said rocking link W being pivoted to one end of the rod X, the opposite end of which is pivoted to crank Y, fastened to the shaft of the pinion Z, said pinion Z engaging with segmental rack Z,firmly fastened to hand-lever O, pivoted in supportblock Z.

By moving hand-lever 0 said yoke-frame P is raised and lowered, carrying said roller B from one side of said cam A to the other, and thus reversing the position of the valve.

The rod 1) is pivoted at its upper end to rod V and at its lower end to outer end of arm 0 of the rocking lever 0 d, pivoted in supportblock 6, the outer end of arm d containing the roller g,which contacts with cam f on drivingshaft r, said contact being effected by flat spring h, fastened to support-block i.

As the cross-head A-reciprocates, and the driving-shaft r revolves, the cam f, by means of lever 0 d and rod 1), raises and lowers sliding block a in said link W, to correspond with the position of the said roller'B in said cam A, in order that the movement of the handlever 0 will move roller B in the right direction.

The rod j is provided with a slot, 0, in its lower end, which fits upon pin it in arm 0, the upper end of said rod j being pivoted to arm is, fastened firmly to hand-lever 0, whereby the vibrating arm a (I may be thrown out of 100 contact with said cam f whenever lever O is moved, or when the engine is running. Said cam f is so adjusted on driving-shaft 1" that said sliding block a moves in the corresponding direction to that of said roller B. The throw of the arm T being always the same, and the throw of the said roller B varying according to the position of the cross-head A, said rollerB having no motion at the end of the stroke and greatest throw in the middle of the stroke, the said coil-spring R compensates for the variable vertical motion of the roller B as the said cam A is slid longitudinally, and whenever the sides of the cam A cont-act with said roller B at the end of the stroke it is prevented from moving up or down. By moving hand-lever 0 said pinion Zand crank Y make a complete revolution, the yoke-frame P stopping in the position shown in Fig. 1, the rollerB vibrating without interfering with said yokeframe P when the engine is running.

The movement of the valve-gear is as follows: The cross-head A reciprocating longitudinally, carrying with it the cam A, causes the rocking lever C D E to vibrate, giving motion to rod F, rocker-arms H andI, rod J and the proper motion to the valve 12. To obtain the full travel of thevalve, the block G is slid down to the lower end of the rocker E, as shown in Fig. 1. To vary the travel of the valve, and cut oil the steam earlier in the stroke, the lever O and block G are raised,

the block G moving toward the center 0 of rocking lever C D E. To reverse the movement of the valve when the engine is running, so that the steam may be used directly opposed to the movement of the piston, as when a sudden stop is desired, the lever O is thrown back, thus raising the sliding block G to the upper end of roeker-arm D, and giving an opposite movement to the valve from that which it\had when block G was at the lower end of rocker-arm E. 7

When the engine is at rest, to cause it to move in either direction the lever O is moved backward or forward and the roller B changed to the corresponding side of the cam A.

The quadrants p and q are provided with notches to hold levers O and O in position by means of the catches, as shown.

Having thus described my inventi on,what I claim is- 1.. The combination, with the cross-head A and valve 12, of the cam A, roller B, and yoke P, as and for the purposes set forth.

2. The combination, with the valve 2) and cross-head A, of the cam A, roller B, yoke P, and actuating mechanism, as described.

3. The combination, with the valve 0 and cross-head A, of the cam A and actuating mechanism therefor, as and for the purposes set forth.

HARRY G. MANNING.

Witnesses:

SYLvENUs WALKER, OnAs. S. GOODING.

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