US1324064A - peters - Google Patents

Description

A. E. PETERS. EMERGENCY STOP EORSTEAM ENGINES.

APPLICATION FILED MAR. 29. I917- Patented Dec. 9, 1919.

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I INVEIVTUR fla MW ATT R/VEY A. E. PETERS.

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APPUCATION FILED MAR. 29 I917- I v Patented Dec. 9,1919.

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[NI/ENTOR B) M 4% MED/{HEY i 'nnirnn srA'rEs PATENT E ARTHUR E. PETERS, OF EASTON, PENNSYLVANIA, ASSIGNOR TO INGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

device, a practical embodiment of which is illustrated in section,

EMERGENCY-STOP FOR STEAM-ENGINES.

To all whom it may concern:

Be it known that I, ARTHUR E. PETERS, a citizen-of the United States, residing at Easton, in the county of Northampton and State of Pennsylvania, have invented a (3811121111 new and useful Improvement in Emergency.-

Stops for Steam-Engines, of which the following is a specification.

This inventionrelates to an emergency stop for steam engines, and more particularly to a device of this kind for use with steam engines of the puppet valve type.

The object of the present invention is to provide asimple and effective emergency stop, particularly adapted for use with steam engine valves of the puppet type whereby the steam admission will be automatically cutoff and the engine brought to rest whenv the engine speed attains a predetermined maxlmum due to the failure to.

operate of the main governing means by which such engines are ordinarily controlled, thus contributing to the safety and efficiency of the engine.

The, above object is accomplished by the represented in the accompanying drawings, in which:

Figure 1 is a view of the steam cylinder, inlet valve and emergency stop mechanism in end elevation, certain of the parts being 1 Fig. 2, a top plan view of the steam cylinder, the governor lay shaft and the emergency stop lay shaft,

Fig. 3, a cross sectional elevation of a modified form of my invention, 7

Fig. 4, a sectional view of the tripping means used in connection with my emergency stop mechanism with the plimger in extended position, and

Fig. 5, a similar view of the tripping means with the plunger in retracted position. a

In the drawings is shown a. steam cylinder 1 provided with inlet valves 2 and exhaust,

valves, not shown. Mountedparallel tothe cylinder 1 on brackets or arms 3, 3, projecting therefrom, is a governor lay shaft 4, driven in any desired manner, as, for instance, by gearing or link belt from the engine shaft. On this lay shaft 4 aremounted inlet valve operating eccentrics 5, and exhaust valve operating eccentrics 6, the construction and operation OfWlHCll form no Specification of Letters latent.

Patented Dec. 9, 1919.

Application filed. March 29, 1917. Serial No; 158,279.

shown) also connecting the exhaust valve operating eccentrics 6 with the exhaust valve bonnets. The inlet valve operating rods 7,

at one extremity are each secured to one end of a cam 8, the other end of which engages one arm of a bell. crank lever 9 to raise the valve plunger 10 to admit operating fluid to the engine cylinder 1. These cams 8 rock 011 pins 11, mounted in the projecting lugs 12 of the valve bonnet. The pins 11 which rotate in bearings providedfor them in the lugs 12 of the valve bonnets have in their central section an eccentric portion 12 It is about this section of the pins 11 that the cam 8 oscillates when the engine is running under normal conditions. It will be seen that a rotative movement of the pin 11 will, by virtue of the eccentric portion 12 throw the cam away from bell crank 9. The cams 8 may, if desired, be constructed in the form shown in Fig. 3, thus eliminating the bell cranks 9. To one of the projecting ends of each valve pin 11 there is made fast one end of a short crank arm 13, theopposite ends of these crank arms 13 being pivoted to conintermediate shaft 16 there is collared a bell crank lever 17, one arm of this lever forming a cam 18 pro ecting 1n the direction of the 60081113110 shaft 4:, the purpose of which will be hereinafter set forth. To the other armof this bell crank lever 17, a weight 19 is suslocked against falling.

J ournaled on the eccentric or lay shaft 4:, and arranged to rotate therewith, is a cylindrical collar '20 having a hollow projecting portion 21. In this projecting portion 21 is fitted a plunger 22 having a body portion, a central tapered portion and a proj ecting pin portion. The body portion of the plunger 22 is normally retained close to the lay; shaft 1 in the following manner. The projecting portion 21 of the collar 20 is provided with a series of holes 23 into which pended in a manner so that it is normally 7 fit balls 24:, these balls extending slightly beyond the wall of the projecting portion 21 and so located as to rest against the tapered plunger portion to normally retain the plunger in retracted position against the eccentric or lay shaft i. Disposed circumferentially of the projecting portion 21 of the collar is a cylindrical weight 25 which rests with a tapered fit against the collar 20 when in closed position, and serves to retain the balls 2% in their normal position and hence the plunger :2 in its normal position, as above described. The weight 25 is provided with an axial recessed portion 26 in its outer end which forms'a seat for a coiled spring 27, the other end of which bears upon a washer 2S resting z-igainst the flanged portion of an adjusting nut 30 threaded in the interior of the projecting collar portion 21. This nut 30 has an axial passage through which the pin portion of the plunger projects, the inner end of this passage being recessed to provide a seat for the tapered portion of the plunger when it assumes its open or operative position. The collar portion 21 is secured to the lay shaft 16 by means of a set screw 31 and key The operation of the steam engin is ordinarily cont-rolled by any form of governing mechanism,which forms no part of the present invention, so that the engine will at no time attain a speed sniiicient to cause the operation of the present emergency stop mechanism to occur while thus controlled. When, however, the governor breaks down, or for any other reason loses control of the engine, the engine will speed up to a prede termined extra maximum, rendering the emergency stop mechanism operative in the following manner. The spring 27, before mentioned, is calibrated to withstand the centrifugal force exerted upon it by the 7 weight 25 during the normal rotation of the governor lay shaft l, and up to the predetermined extra maximum speed referred to, and is adjustable to various speeds by an increase or decrease in its tension, through manipulation of the adjusting nut 30. When this predetermined extra maximum speed is exceeded the tension of the spring is overcome by the centrifugal force exerted by the weight25, which thereupon compresses the spring and moves outwardly. lVhen this action takes place the plunger 22 is released and flies out, the balls 2% moving into the passage formed between the tapered opposing faces of the weight 25 and collar 20 and being retained therein. Upon flying out the plunger 22 will in its rotation engage the cam 18 on the bell crank lever 17, hereinbefore referred to, rotating this bell crank sufficiently to throw the point of suspension of the weight 19 off center, thus tripping the weight and causing it to fall. The falling of the weight 19 will further rotate the bell crank 17 to impart a rotative movement to the intermediate lay shaft 16 and hence a downward movement to the connecting rods 14, through the crank arms 15, which will, in turn, through the agency of the cranks 18, cause the eccentric pins 11 to rotate in the'lugs 12 in a direction to force the cams .8 away from the bell cranks 9 and thus with drawing them therefrom sufliciently'so'that the cams 8 donot come in contact with the bell cranks 9. The weight 19 in its lower po sition serves to maintain the valve operating parts out of operation, as any motion trans mitted to the cams 8 by the operating rods 7 will cause them to merely rock idly without engaging the valve operating bell cranks 9. Thus, upon the failure of th inlet valves 2 to operate to supply motive fluid to the cylinder l, the engine will speedily come to rest. The plunger 22 is then caused tore sume its normal position'by being manually pressed inwardly against the lay shaft and the lifting of the weight 19 will bring the valve operating parts again into-operative position for re-starting of the engine.

It is to be understood that various changes might be resorted to in the construction,

form, and arrangement of the various parts of this invention, and that while the present showing and description discloses only certain specific embodiments thereof, other forms and modifications are included within th spirit and scope thereof, as expressed in the appended claims.

lVhat I claim is:

1. In an emergency stop for steam engines, a lay shaft, an cccentrically mounted valve ope 'ating cam, means associated therewith for actuating said cam, a rod arranged to vary the position of said cam and centrifugal means on the lay shaft arranged to engage means to actuate the said rod to render the valve operating means inoperative when the engine speed attains a predetermined lllflXlHlllHl.

2. In an emergency stop for steam engines, a lay shaft, valve operating means associated with the lay shaft, a plunger mounted on said lay shaft normallyretained in inoperative position and means for releas- 4:. In an emergency stop for steam engines, a lay shaft, an eccentrically mounted valve operating cam, mechanism associated witi said lay shaft for actuating said cam,

leasing said plunger to engage said project-- ng cam to vary the posltion of theeccentrlc center of said valve operatlng cam, rendering the same inoperative, when the engine speed attains a predetermined maximum.

5. In an emergency stop for steam engines, a lay shaft, an .eccentrically mounted valve operating cam, mechanism associated with the lay shaftforactuating said cam an intermediate shaft mounted parallel to the cylinder and lay shaft, a rod connecting said ntermediate shaft and valve operating'cam,

a bell crank portion on one end ofsaid intermediate shaft one arm of which forms a projecting cam and the other a support for tripping means, a plunger journaled on the lay shaft and centrifugal means for re leasing said plunger to engage the projecting cam and rotate the intermediate shaft thereby actuating the tripping means and causing said rod to alter the position of the valve operating cam torender the same inoperative when the engine speed attains a predetermined maximum.

6. In a tripping means for. operating a safety stop mechanism for engines, a rotating' arm carrying a spring pressed centrifugal member and a plunger, said plunger being released when the spring pressed centrifugal member moves outwardly.

7. In a tripping means for operating a safety stop mechanism for engines, a rotating arm, a centrifugal member movable on said arm, a spring retaining said centrifugal member in retracted position and a plunger movable outwardly to engage a cam move ment of said cam operating means to render inoperative the admission valve mechanism when the speed of the engine exceeds a maximum.

8. In a tripping means for operating a safety stop mechanism for engines, a rotating arm, a centrifugal member movable on said arm, a spring retaining said centrifugal member in retracted position, a plurality of balls normally holding a plunger in retracted position in said arm, said plunger being released when the centrifugal member moves outwardly.

9. In a tripping means for operating a safety stop mechanism for engines, a rotating arm, a centrifugal member movable on said arm, a spring retaining said centrifugal member in retracted position, a plurality of balls engaging said centrifugal member and normally holding a plunger in retracted position in said arm, said plunger adapted to move outwardly to engage means to render inoperative the admission valve mechanism when the speed of the engine exceeds a maximum.

In testimony whereof I have hereunto set ARTHUR E. PETERS.

7 my hand

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