US257486A - Governor for direct-acting engines - Google Patents

Description

(No Model.)

M. G. FOOTE.

GOVERNOR EoE DIRECT ACTING ENGINES. No. 257,486.

Patented May 9, 11882.

spindles similar to H.

UNITED STATES PATENT Fries.

MYRON G. FOOTE, on GOLD HILL, NEVADA.

GOVERNOR FOR DIRECT-ACTING ENGINES.

SPECIFICATION forming part of Letters Patent No. 257,486, dated May 9, 1882.

(N0 model.)

To all whom it may concern:

Be it known that I, M. G. FOOTE, of Gold Hill, Storey county, Nevada, have invented a new and useful Governor for Direct-Acting Engines, of which the following is a specification.

My invention is intended to be applied only to that class of engines in which the power is applied directly to the work Without first being converted into rotary motion by means of a crank. In these direct-acting engines, when the working load is increased the stroke is correspondingly decreased, compelling the engineer to give the engine more steam to bring the stroke up to its correct length, and the reverse of this occurs when the load is decreased.

The object of my invention is to construct a governor which shall give the engine itself complete control over the throttle-valve, making the engine self-correcting, and doing away with the constant attendance of the engineer. I attain this object by the mechanism illustrated in the accompanying drawings, in which similar letters refer to similar parts throughout the several views.

Figure 1 shows an end elevation of a part of this mechanism. A is a worm-wheel keyed onto the throttlevalve stem. B is a worm gearing into this worrn-wheel. This worm is fastened to the shaft 0, which rests in two bearings, c and e. I) is a small gear having flanges on both sides extending beyond the teeth. This gear is loose on the shaft. E is a ratchet-wheel tight on the shaft, and F is a pawl fastened to the side of the gear-wheel, held in position bythe small springG. (Shown in Fig. 3, which is an elevation of one side of my governor.) H is a loop made with the projecting spindles I and Jat each end. This loop has a small internal rack, K and K, inserted into the loop at each end. M is the cross-head ot' the engine, on the slides of which I place the upright arm or standard N, through the eye of which passes the projecting spindle I, fitting loosely. O O are small tappets made to fasten to I by set-screws.

Fig. 2 shows an elevation of the other side of my governor, showing its connection with the rock-shaft. P is a loop having projecting Q is a gear wheel similar to D, only it is fastened tight to the shaft 0 and has no ratchet. At either end of this loop are the pawls R and R. set into the loop in such a way that when un molested they project toward the interior, as shown by R,being kept in position by the small springs r and T, which force the pawls against the shoulder r'. When these pawls moving in one direction come in contact with the gearQ they are merely turned into the space provided in the loop to receive them, as shown by pawl It, until they pass by the gear, when the sprin gs immediately bring them into the position shown by B, not affecting the gear at all. When the motion of the loop is reversed, however, the pawls catch into the teeth of the gear, and it (the gear) is turned a short distance in the direction shown by the arrow. The loop P has a constant. reciprocating motion given to it by an arm, S, on the engine rock-shaft T.

In the engines to which I intend to apply this governor this rock-shaft receives its motion from the cross head in such a way that when the cross head is at the forward end of its stroke the rock-shaft is at the rear end, and vice versa.

The operation of the governor is as. follows: The loop P, with its attendant mechanism, is for the purpose of tnrnin g steam onto the engine, and operates to asmall amount with every stroke. The loop H is for the purpose of turning steam off from the engine, and comes into play when the cngine'stroke is too long. The tappets O O are adjusted for the correct length of the stroke. When this length is exceeded the loop 11 will have a reciprocating motion, and the gear D will alternately mesh into the racks KK, moving the gear alternately in opposite directions. This gear being loose upon the shaft, however, and being connected by the pawl F to the ratchet E, the only motion which has any effect in turning the shaft 0 is the one indicated by the arrow, which has the effect of turning off the steam. The loop H,

These are with its attendant mechanism, can turn off 5 1. The shaft 0, connected by worm or other 2. lhe combination of the shaft 0 with the [-0 gearing to the throttle-valve stem, combined gear Qand the loop P, having the pawls R and with the gear D, which turns the shaft 0 by It, said loop to be given its motion by the rockmeans of the ratchet E and pawl F, also comshaft of the engine, substantially as described, bined with the loop H, having the internal and for the purpose set forth.

racks, K and K, said loop to be given its mo- MYRON GALE FOOTE. tion by the cross-head or other, reciprocating Witnesses: part of the engine, substantially as described, JOHN W. PARKER,

and for the purpose set forth. CHAS. CUMMINGS.

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