US377168A

US377168A - Steam-engine governor

Info

Publication number: US377168A
Authority: US
Publication date: 1888-01-31
Anticipated expiration: 1905-01-31

Description

(No Model.) 3 Sheets-Sheet 1;

I P. MQMAHON. STEAM ENGINE GOVERNOR.

No. 377,168. Patented Jan. 81,1888.

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STEAM ENGINE GOVERNOR.

. Patented Jan, 31 1888.

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' F. MOMAHON. STEAM ENGINE GOVERNOR. No. 377,168. Patented Jan. 31, 1888.

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UNITED STATES PATENT 'GEFICE.

FRANCIS MOMAHON, OF SOMERVILLE, MASSACHUSETTS.

STEAM-ENGINE GOVERNOR.

fiPECIPICATIONforming part of Letters Patent No. 377,168, dated January 31, 1888.

Application filed July 25, 1887. Serial No. 245,208. (No model.)

I To osZZ whom, it may concern.-

Be it known that I, FRANors MoMAHoN, of Somerville, in the county of Middlesex, of the Commonwealth of Massachusetts, have invented a new and useful Improvement in Steam-Engine Governors; and I do hereby declare the same to be described in the following specification and represented in the accompanying drawings, of whichto Figure 1 is a front elevation, partly in section; Fig. 2, a side view; Fig. 3, a vertical, median, and longitudinal section, and Fig. A a vertical, median, and transverse section, of a governor of my invention, the nature of r5 which is defined in the claims hereinafter-presented. Fig. 5 is a horizontal section of it, taken on the line 1 1 of Fig. 3. Fig. 6 is a side view of the twospiral camsfor depressing the steam-valve. Fig. 7 is aview of "the dial of the speedindicator.

In Figs. 3, 4, and 5 of such drawings the pipe for leading steam to the valvechest B is shown at A, it being supposed to be provided, as usual, with a throttle-valve, whose case is In the chest B is the valve D, which is circular and moves vertically within a cylindrical chamber, E, having lateral inducts or ports a and an educt, b, there being around the cylinder a clear space, 0, for

20 reception of the steam from the pipe A. The educt isto lead steam to the valve-chest of the steam-engine. The stem of the valve D is shown at d, it being provided with a'spiral spring, F, for elevating it and the valve, the

5 mechanism for depressing it being hereinafter explained. The shaft for driving the governor is shown at G as supported in a stationary \sleeve or bearing, 6, and provided with a pulley, H, to which an endless band from a wheel 40 or drum on some shaft of the steam-engine is to work in order to revolve the shaft G. On

. theinner end of such shaft G is fastened abevelgear, f, which engages with another such gear, g, secured upon the lower part of the tubular 5 or hollow revoluble spindle I of the governor. To this spindle two arms, h h, carrying at their lower ends balls taarepivoted. A cylindrical stud, It, extends forward from each of the balls t 7;. Two arms, Z Z, fixed on the studs 7t it, pro

ject inwardly therefrom, and by links at m are connected with two curved arms, a 12, extending from two spiral cams, 0 1), arranged one over the other and within and revoluble in the spindle I. The upper cam bears at top against a partition, g, going across and stationary within and relatively to the spindle. The spiral spring F rests at its foot on such partition q, and at top bears against a washer, 7*, fixed on the valve-stem d, which in the drawings is shown as raised to its highest position by the said spiral spring F. The arms h it have curved or bow springs 3 applied to them and to the spindle for forcing such arms inwardly after outward movements of them by centrifugal force. While the spindle is revolving the balls will be thrown outwardly, and in so moving will cause, by the mechanism connecting them with the two spiral cams 019, such cams to simultaneously turn horizontally, and thereby cause the valve-stem d and valve D to be moved down, so as to more or less close the ports orindncts a of the part E. The ends of the cams that arein contact are spirally shaped,

to cause them, when the cams are turned opposite ways, to move both cams verticallyone downward and the other upward.

The spindle I is supported by a frame, L, projecting, as shown, from the valve chest B. On the neck 25 of such frame is asleeve or ring, a, grooved circumferentially. Two arms, 11 o, pivoted at their lower'ends to such sleeve, we tend upward, as shown, and are slotted or open lengthwise downwardly from near their upper parts to receive the two arms h h, which go through the said arms a a. (See Figs. 1 and 3.)

A furcated toothed sector, M, fnlcrumed to a bracket, w, extending upward from the frame L, has each of its prongsx as provided with an anti-friction wheel, 1, that enters the peripheral groove of the sleeve 10. The teeth of the sector Ill are to engage with a pinion, N, on the spindle O of the throttle-valve. (See Fig. 5.) This pinion is movable by hand or otherwise on the said spindle O, lengthwise thereof, into or out of engagement with the sector,such pinion, when in engagement with the sector, being clutched to the hub of the hand-wheel w of the spindle O by clutch-teeth z, extending from both hub and gear.

011 theballs of the governor, when revolving, being thrown outwardly by centrifugal IGO force, the sleeve u will be raised, so as to cause the toothed sector to be moved out of engagement with the pinion N, the sector being moved below the said pinion; but should arupture of the driving-belt of the pulley H take place the balls will fall, and as a consequence the toothed sector will be moved into engagement with the pinion and cause it to turn the spindle O to close the throttle-valve, and thereby cut off the passage of steam to the engine. By moving on the spindle O the pinion outof engagement with the toothed sector, the throttle-valve may be worked by manual power applied to the hand-wheel as.

A speed-indicator, \V, is shown as applied to the governor. To this end the upper part of the gearg is formed as aworm or screw, a,

which engages with a worm-gear, b, fixed on a shaft, 0, in a cylindrical case, B, provided with adial, S, suitably divided. On the shaft 0 is fixed aworm, d, that engages with a wormge'ar, e, fixed on an arbor, f, carrying a hand, 9, to turn around the dial.

I claim-- 1. The combination, with the revoluble spindle I, its arms h, and balls 2', and with the stem d, of the valve D, of the spring F, for elevating the valve-stem, and the mechanism connected with the said balls and stem for depressing the valve, such mechanism consisting of the studs 7c, arms Z, links m, curved arms at, and the spiral cams 0 1), all being arranged and to operate substantially as set forth.

2. The combination, with the ball-governor and the throttle-valve stem, of the mechanism for effecting the closing of the throttle-valve in case of breakage of the driving-belt of the governor, such consisting of the open or slotted arms 0, applied, as described, to the arms h of the balls 6, the grooved sleeve u, forked toothed sector M, and the pinion N, the latter being applied to the throttle-valve spindle 0 and movable lengthwise thereon, and having means of clutching it to the hand-wheel 0c of such spindle, as specified.

3. The combination of the speed-indicator, as described, with the steamengine governor, substantially as set forth.

' v FRANCIS MOMAHON.

Witnesses:

R. H. EDDY, R. B. TORREY.