US451649A - Electric stop - Google Patents

Description

(-No Model.) I

C. A. DAYTON. ELBGTRIG STOP MOTION.

No. 451,649. Patented May 5,1891.

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UNITED STATES PATENT OEETCE.

CHARLES A. DAYTON, OF PRESTON, CONNECTICUT.

ELECTRIC STOP-Merloni.

SPECIFICATION forming part of Letters Patent No. 451,649, dated May 5, 1891.

Application iiled April 21, 1890. Serial No. 348,867. (No model.) v

To all whom it may concern:

Be it known that I, CHARLES A. DAYTON, a citizen of the United States, and a resident of Preston, in the county of New London and State of Connecticut, have madea certain new and useful Improvement in Electric Stop-M0- tions for Engines, which improvement is fully set forth and described in the following specification, reference being had to the accom panying sheet of drawings.

This invention relates to stationary steamengines, and has for its object the production of a simple and inexpensive attachment to be used in connection with the speed-governor for the purpose of stopping said engine from distant parts of the 'shop'. In cases of accident to employs or of breaking of machinery throughout the shop this is especially desir- With my present invention the pressing of a button is the only act-ion necessary to stop the engine and its connected machinery.

To explain said invention I have provided the annexed drawings, in which- Figure lis a side elevation of a portion of an engine-bed, showing cylinder, steam-chest, governor, the., and having connected thereto my electric stop-motion. Fig. 2 is a top view, somewhat enlarged, of the shaft and pulley which drive the governor and the system of levers and electro-magnet by means of which I am able to stop the engine, as hereinafter explained. Fig. 3 is an enlarged end view of one of the cut-offs thatcon trol the steam as ixt enters the cylinder; and Fig. 4 is a detail view, partly in section, of the connection between the governor and the rods for operating the valvecontrolling mechanism.

In the drawings, the letter a denotes a portion of the engine-bed; o, the steam-chest; c, the governor as a whole; d, a lever hung on bed et, and ca rod connecting said lever with an eccentric on the crank-shaft of the engine, all of the described parts being substantially the same as in horizontal engines of thewell-known Harris-Corliss class. Thetaking and exhausting of steam are controlled in the manner usual in such engines and, brieiiy described, consists of a disk f, that is located at the center of the steam-chest c and is rocked by a rod g, that connects said disk with the upper end of lever d. At the two upper corners of the steam-chest are rock-sh aft-s h, that carry valves which control the entering steam, i

and at the two lower corners are similar rockshafts t', that control the exhaust. These several valve rock-shaf ts bear crank-arms h and i', the latter of which are connected with disk f by rods 7a.

The inlet-valve rods 7i bear crank-arms h', that are connected with disk f by rods 7s', in such manner that when the desired quantity of steam has entered the cylinder, rod 7a is disengaged from the crank-arm 7L', which is then quickly moved to close the connected valve.

On the valve-shafts 7i are disks m, that may be rocked by rods n, connecting with the governor, which disks are formed with project-v ing portions m', that when rocked in either direction serve to disconnect the ends of rods 7o from the crank-arms h in a manner wellknown in this class of engines. The raising or lowering of the governor-balls brings the projections m into operative engagement with a latch on the ends of rods k, this latch mechanism being best illustrated in Fig. 3 of the drawings.

On the end of connecting-rod k is pivoted a fork, whose curved uppery arm 0 as it advances engages and is forced downward by one of the projections m. This depresses the lower arm o of said fork and throws its hookshaped end out of engagement with the arm 71,. All of the elements thus far described are old and well-known to those skilled in the art, and I make no claim to them.

The mechanism which embodies my invention is connected with the pulley p, by means of which the governor c is driven. This pulley I make as a friction-clutch pulley of any practical form. As here shown itconsists of two cup-sections, one fitting over the other in such manner that when the two sections are forced together the frictional contact of their engaging surfaces is sufficient to rotate the pressed outward by a spring u., secured tothe engine-bed.

u denotes a pawl pivoted in the said bed and having its end formed as a hook that may 5 engage and hold the free end of lever t against the force of spring a. This pawl yv also serves as the armature of an electro-magnet w, whose wires run to push-buttons located at convenient points in the shop. ro The action of my described mechanism is as follows: When button a is brought into use and the electric circuit completed, the magnet w draws the hook end of pawl fz: out of engagement with the free end of lever '6, and said lever is then forced outward by spring u, carrying with it the connected lever t. The outer section of the friction-pulley is thus moved out of engagement with its companion section and the governor stops. As 2o the governor-balls drop, rods n are moved by means of the three-armed lever n and rock the disks m and bring the projections m into the path of the curved arm o of the fork with this result: the lower arm o of said fork cannot act to open the valves, and the engine, after two or three revolutions, stops. Vhen it becomes necessary or desirable to again start the engine, lever t is forced inward against spring u and held in place by hooking its free end under thc pawl fr, when the engine is again in shape to run precisely the same as ii' my stop-motion were not applied thereto.

While I have described in detail my preferred construction of said stop-motion, cer- 5 5 tain modifications could bemade therein without departing from the spirit of my invention, so long as the stop-motion is arranged to work with the governor in substantially thc manner described. 4o

I claim as my invention- 1. The combination, with the driving-shaft of an engine-governor,of elect'rically-operated mechanism, substantially as herein set forth, for throwing said governor outof working engagement with said engine, for the purpose speciiied.

2. In an engine, in combination with the drivingshaft of the governor, a clutch-pulleyon said shaft, asystem of levers connected 5o wlth said pulley, as set forth, and an electromagnct whose armature Serves as a latch to control said levers to hold the two sections of the said clutch pulley in operative engagement, all being substantially as and for the objectspecified.

CHARLES A. DAYTON.

Witnesses:

FRANK II. ALLEN, ALONZO M. LUTHER.

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