US1140694A - Engine-stop. - Google Patents

Description

G. H. MCFEATERS.

ENGINE STOP.

APPIICATION FILE'D SEPT. 25| i908.

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G. H. NICFEAIEIIS.

ENGINE STOP. APPLICATION FILE'D SEPT. 25, 190s.

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G. H. IVIcFEATERS.

ENGINE STOP.l

APPLICATION FILED SEPT. 25. 1908.

. 1,140,694,l Patented May 25,1915.

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Geenen HAMILTON rrrnarnns, or Jonns'rowu, rnnusvnveme.

ENGINE-STG?.

To all whom it may concern.'

Be it known that l, Grotten H. MoFnAT- Ens, of Johnstown, in the county of Carnbria and State of Pennsylvania, have invented a new and useful improvement in Engine-Stops, of which the following is a full, clear, and exact description, reference' being had to the accompanying drawings, which form a part of this specification.

My invention has relation to automatic stops for steam engines, and particularly relates to that class of engines, known as the Corliss type.

One of the objects of my invention, is to provide a stop in which a guard member will be thrown in front of the lifting pawls which raise the crank arms, connected to the valve stems of the engine. Une of these guard members is provided for the lifting pawl on each side of the cylinder of a single acting engine, and are provided for the lifting-pawls on the high pressure cylinder o a compound, or triple expansion engine. These guards are rotatably mounted on the bearing for the valve stem, and when the engine is to be stopped, the guards are rotated so as to come into alinement with the lifting pawls, and prevent them from engaging and lifting the crank arm of the valve stems.

Another obiect of my invention s, to oonnect these guards by means of a link, with a cross head which is connected 'to a movable rod held in its normal or elevated position, by mechanical orl electrical means. When the rod is held vin its normal position, (the running position) by means of a solenoid, the current acting thereon, woul be a normally closed circuit, and when it is desired to stop the engine, the circuit is opened; and when the rod isretained in its elevated postion by mechanical means, l provide an electromagnet to release the rod, and the movement of the same will rotate the guards into the line of movement of the lifting pawls.

Another object of my invention is to provide various hand switches at different points throughout the power house, or plant, the closing of either of the switches in this Acircuit releasing the rod.

Specification of qcritters E'atent.

Patented May 25, i915.

Application filed September z5, 1908. Serial No. ya.

Still another Object of my invention is to provide an individual stop for each engine in a large power plant, in which the generators are each directlyI connected with their respective the various switches, that each engine can be stopped from a series of points, and throwits vcircuit breaker while the engine is being stopped.

attain these various objects bythe mech-- anism described .in the annexed specifica-A tion, and illustrated in the accompanying drawings, in which :f

Figure l, is a side elevation of the cylinder end of aCorliss engine with my improved stop attached; Fig. 2, is a detail side elevation of a valve stem, the guard and the lifting 'pawl showing the lifting pawl in engagement with the valve stem crank arm; Fig. 3, is a view similar to Fig. 2 showing the guard in alinement with the lifting pawl, to prevent the engagement of the lifting pawl with the crank arm, of the valve stem; Fig. 4f, is a` front view of the rod releasing mechanism; Fig.. 5, is a vertical section through the same. y

As the valve mechanism on, one side of the cylinder is a duplicate of that on the other side, I will merely describe the connections for one side.

l, is the valve stem to which is connected a crank arm 2, which is provided with a projection 3, adapted to be engaged by a lifting pawl Ll, to rotate the valve stem l,

`to open the valve and admit pressure to the cylinder.

Loosely mounted on lthe Aoutside of the valve stem bearing, is the ring 5, to which is connected the adjustable guard' member 6, and the link 7 When this ring 5, with its guard, is in the position shown in Figs. l and 2, the lifting pawl 4, is free to lengage the projection :3, and rotate the valve stem', but when the ring has been rotated into the position shown in Fi; 3, rthe guard .6. is in alinement with thefpawl 4, which will prevent its engaging projections 3, and

allowing the admission valve to remain closed. The other end of the link 7 is pivotally connected to a cross head 8, secured to a rod 9 of non-magnetic material. This engines, and to so connect rod 9, is mounted in bearings 10,l 10,so as to slide therein. rlhese bearings 10, l0, are secured to a bracket 11, which is rigidly secured toa portion of the steam chest of the engine.

1V, is an electromagnet lwhich is connected to the bracket 11', but is insulated therefrom. This electromagnet is provided with a soft iron core 12, surrounding the rod 9, and it is also provided with the usual pole pieces 13 and 24. Pivotally connected to the polepiece 13, is the armature Li, which is provided with the adjustable stop 15 and the screw 16 at the end thereof. Secured to ,the pole piecel, is .an 'angular piece 26,

which is provided with a hook 17.

Pivotally secured to the cross head8, is

la spring catch 18,-which engages the hook4 the space, and electrically connect the in gers 20, when the same is pushed inwardly.

When the current is passed through the magnet A', the armature l14, will be attracted by the magnetic lines oi force, and

the screw 16, atthe end of the armature.

lwill strike the spring catch 18, releasing it from the hook-17, which will allow the rod 49 to drop, carrying with it the cross head 8, which will rotate the ring y5 through the medium of link @and bring the guard 6, in line of movement of the liftingpaWl e, which will cut off the pressureto the cylinder. When this .rod 9 isI dropped, the cross head 8, will strike the bridge piece 21, and close the .circuit through contact fingere 20 for the purpose hereinafter described.

When the engine israinning, the various parts are in the' positifriin shown in the drawings', 'and if it is desired to stop the engine,

tliel circuitis closed through the electro' niagnet Ai, reieasing the rod 9, which will throw the guard 6', in alinementwith the pawl t, and close the switch B', and 'closethe cirdesired mechanism.

lf the engine is protected by the stop' in the drawings, the rod 9, is raised until the throttle can be opened to start the engine.

1t will readily be understood from the 'foregoing description, 4and the drawings,

-is under the ycontrol of the engineerv from' that l have devised an engine stop, ywhich `.various points. Also a stop in which one engine of a series, or the whole plant, can

shutbdown almost instantly. v -I havev also provided means for. closing. anv electric ein.

the rod 9,-

cuit through a switch arranged to close the i circuit through any. actuating mechanism when the engine stop is actuated.

I do not wish to limit myself to the details of construction, as .the same can vbe changed without departing from the spirit and scope of my invention.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent isz- I l. An engine having a pressure cylinder, a piston in said cylinder, oscillating valves for controlling the admission of pressure luid to said cylinder, actuating -levers connected to said valves, projections on said levers, valve shifting devices movable abouty the axes of said valves for engaging the projections to open the valves to admit pressure to the cylinder, means to oscillate the valve shifting devices', guards movable about the axes of the valves and arranged to prevent the shifting devices engaging the proictions, a gravity-actuated device movably mounted between said guards, links connecting the guards to the gravity-actuated de vice, and means orfreleasingthe device to permit Vit to drop to move the guards into' the path oi? movement of the valve-shifting devices; substantially as described.

v 2. An engine having a pressure cylinder,

a piston in said cylinder, oscillating valves for controlling the admission of pressure -iluid to said cylinder, actuating levers oo nnected to said valves. projections on said levers, valve shifting devices movable about the axes of said valves for engaging the pro jections to open the valves to admit pressure to the cylinder, meansto oscillate'the valve shifting devices, guards movable about the axesof the valves and arranged to prevent the shifting devices engaging the proiections, a gravity-actuated device movably mounted between said guards, links connecting theguards to the gravity-actuated device, and electrical means for releasingy the device to permit it todrop to move the guards into the path of movement of the valve-shifting devices; substantially as described. cuit through a circuit breaker or any' other 3. An engine stop of the character described, comprising oscillating valve-actuating devices, guards movable about the axes of the valve shifting devices arranged to be shifted into the patho movement of said valve-actuating devices, a gravity-actuated rod slidably mounted between the -iio valve-actuating devices, links pivoted to the guards andthe gravity-actuated rod, an electric magnetsurrounding said rod, a spring catch pivotally connected to the rod,

'a projection arranged toA be engaged by the catch, a pivoted armature, and means on said armature for releasing the catch; substantially as described.

d. An automatic' step for enginesof the'.

.'Corliss type having oscillating valves, a

stem on each of said valves, a lever on each of said stems, lifting projections on said levers, an oscillating device for each valve having a lifting hook for moving the valves to their open positions, and `oscillating guards movable about the axes of said valves arranged to be moved to lpoints adjacent to said projections and into` the path of the hooks to prevent the hooks from engaging the projections; substantially las described.

5. An automatic stop for engines of the Corliss type having oscillating valves, a stem on. each of said valves, a Sleveron each of said stems, lifting projections on said levers, an oscillating device for each valve having a lifting hook movable about the aX'es of said valves for moving thel valves to their open positions, oscillating guards arranged to be moved to points adjacent to said projectionsl and into the path of the hooks to prevent the hooks from engaging the projections, a gravity-actuated device for moving said guards, means for` holding said gravity-actuated device inits elevated position, and an electro-magnet for releasing said gravity-actuated device; substantially as described.

' 6. An automatic stop for engines of the Corliss type, having oscillating valves, bell crank levers movable about the axes of said valves having hooks for actuating the valves, cam devices for engaging one of the levers of said bell crank for releasing thel hooks, and guards movable about the axes ofthe valves arranged to bev moved into the path of the hooks on the other levers to prevent said hooks actuating the valves; substantially as described.

In testimony whereof, I have afIiXed my signature in presence of two Witnesses.

GEORGE HAMILTON MCFEATERS.

C'pies' of this patent may be `obtained for ve cents each, by addressing the Commissioner of Patents,

.Washingtoxn D.

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