US1354703A - Governor-valve controller for steam-engines - Google Patents

Description

C. ST. JOHN.

GOVERNOR VALVE CONTROLLER FOR STEAM ENGINES. APPLICATION FILED IAN. 25. 1920.

2 SHEETS-SHEET l.

Ifl IIIII 'IIIIIIIII Ema.

l 3mm/Ito?,

Patented Oct. 5, 1920. v

c.sT.1oHN. GOVERNOR VALVE CONTROLLER FOR STEAM ENGINES.

APPLICATION FILED IAN. 25, 1920- 1,354,703.

Patented Oct. 5, 1920.

2 SHEETS-SHEET 2.

' a portion of an engine, a portion of a ma- UNITED STATES CLAYTON ST. JOHN, OF MIIMISBURG, OHIO.

Specification of Letters Patent.

GOVERNOR-VALVE CONTROLLER FOR STEAM-ENGINES.

Patented Oct.- V5, 1920.

Appiication inea January 2e, i920. semi No. 354.046.

ToaZZ whomz may concern; Y

Be it known that l, CLAYTON ST. JOHN, a citizen of the United States, residing at hliamisburgn' the county of Montgomery and State of Ohio, have invented certain Vnew and useful Improvements in Governor- Valve Controllers for Steam-Engines; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled vin the art to which it appertains to make and use the same.

rl`liis invention relates to valve-controlling devices, and` more specifi-cally 'to an improved governor valve-controller for steam engines, and comprises improvements on a valve-controlling mechanism similar to that disclosed in the Patent No. 979,289, issued to S. S. Hall on Dec. 2O, 1910.

An object of this invention is to supplenientv the emergency-controlled connection of said mechanism by another emergencycontrolledl connection, and thereby additionally safe-guarding the speed of the engine. Y

b Another Objectis to'provide an improved speed-controlled attachment whichv is eX- ceed'inglysiinple of construction and operation, easily attachable to an engine and to a machine'driven by the engine, is positive and instantaneous in its action, adjustable to operate at' different maximum speeds, and adjustable to operate in connection with controlling and controlled shafts spaced'various distances from one another. Other objects and advantages are pointed out or implied in the following details of description in 'connection with the accompanying drawings in which; f

Figure l is a perspective view illustrating chine driven by the engine and, in turn, driving the governor of the engine, and an emergency-controlled valve-controlling mechanism 'including the presentinvention. `Fig. 2 is a detailv sectional view, the section being taken substantially along the line 2 2 of Fig. 1. 'w l Fig. 3 is an enlarged detail view illustrating a portion of the mechanism which controls the governor-valve. y L n l Fig. 4V is a detail sectiona-lview, thek sec- 'tion'being taken substantially along the line 4-"4 of Fig. 3. I

Referring to these drawings in detail, in whichsimilar reference-*characters correspond with similar parts throughout the several views, and in which the valve chamber'l, governor 2, and machine 3 are of' well lmown construction, the invention consists in the provision of an attachabletripentension 4 and an attacha-ble rotary tripping deviceV 5 which will be described in detail in connection with the governor-valvestem 6 and means for controlling the latter in Opposition tothe action of the governor 2. These means will now be specifically described in connection with the controlling device 4-5 as follows:

The governorA frame 7 is formed with bearings in which a well known form of valve-.controlling shaft 8 is mounted for rotary or rocking movement, this shaftbeing provided with an arm`9 which engages between a pair of shoulders 10 of the valve- Vstem 6 in suchv relation that the latter is normally held up in the position for holding'the valve (not shown) open. The shaft 8 is, in turn, held in this valve-supporting' indicated in Fig. 2, the other end being connectedto a ratchet-wheel 12 through the Amedium of a polygonal boss 13, the latter being integral with the ratchet-wheel, and this member 12--13 being journaledf on the shaft 8 and adapted to be rotated independently of the latter. A pawl 14 is united with a shaft15, and an arm 16 extends laterally from the shaft and constitutes a trip-arm which is operable to disengage the pawl`14 from the ratchet wheel 12, and the trip-extension or tubular attachment 4 is adjustablyisecured on the arm 16 by means of a set screw 17 or by other appropriate means. ber 4 is closed by means of a solid headv 18 which is preferably rectangular, and this head stands in the path of aV pusher 19 which lis pivotally mounted at 2O on a disk 21, the latter being secured by any appropriate means on a portion of a shaft 22 of the machine 8. A spring 24 has one end connected f to lthe pusher 19, its other end being connected to a screw threaded member 25 which is provided with a nut 26, the latterbeing cooperative with the member 25 for tensioning the spring 24 for a purpose which will presently appear. It is obvious that the rotary tripping device 5 comprises the elements 19 to 26 inclusive, and in addition,

The lower end ofthe tubular mem- ,'1hislattershaft coacts with the governorfb'e driven by the engine through any approy actuated shaft 32 throughthe mediumof a chain 33 and sprocket wheels on the respective shafts'l31 andv 32. The `machine 3 may priate means (not shown) so that the speed of lthe'machine is controlled by the speed i Yof theY engine, vand on the other hand, the

- [.ti'guous transmission elements.

speed of the engine is controlled by the speed ofthe machine 3l through the medium' 0f Vthe, governor-,actuating shaft 32 and the con- Therefore, the governor 2Ycontrols the speed ofthe engine and machine under normal conditions,

' butin the event of the breaking of abelt or driving chain which connectsA the machine to the engine, the-latter will exceed its safe speed limit, and the prior patent (previously referredv to) provides for such contingency by employing an-idler 34 which is carried bythe main driving chain 35 and `by an.' arm 36, the latter being pivotally vmounted onV the governor frame 7 and carry-- ing a caml37 which is movable by the arm 36 intoV contact with 'the' trip-extension 4.

` VTherefore,in the event the belt or chain 35 Ythe pawl 14v out of engagement with the breaks,. the arm 36`swings downward on its -pivot, moving the cam 37 againstv the tripextension 4 andv causing shaft 15 to swing Y ratchet,12, Now, assuming that the ratchet valve stem 6 up), the removal of the has previously been turned Vforward in the Ydirection of the arrow, (so as to tension'the spring 11 and cause thearm 9 to hold the K pawl 145 from' its engagement with the ratchet- :W-heel effects therelease of the latter and ,permits it to relax its tensioning effect upon the spring 11. Moreovenwhen the pawl 14 is released, the yaction ofjthe spring suddenly rotates the ratchet backward, and this Y.momentum combines withthe Yweight ofthe jvalve-stem 6to lower the latter so as to `close the ,valvein the chamber 1. Moreover, Aassumingfthat the governor is operating Y gwhenthe-ratchet-wheel'12 is released, the

.resistance of the spring 11 in opposition to the governor 2 is released, and thefgovernor 1asslstsin closing the valve or reducing its .outlet to such an extent that the racing of .'theen-gine and machine is checked.

.f Any appropriate means 'may be provided for securing thevalve in itsv closing position, after' beingclosed by the means prefvOusly specified,"and in this connection,"the 4previously yknown device which is 'employed .-in'eonnection withthis'V attachment 4 -briefly describedv as follows: Y

A"radially ,extendinggarm 38 is united may be` with the shaft V8l and is provided with a shoulder 39 which stands inthe path of the vattachment 4, and when the latter is moved forward Vby means rof the cam 37, it moves'against the shoulder 39 and prevents the latter from returning to its normal position, thereby coacting with the` shaft'8 and arm 9in holding the valve-stem down. In this connection, it should be understood that the attachment 4 is secured in its engagement with the Shoulder 39 by means ofthe Cam'.` t -V l j From the foregoing description, it will be Yseen that the previously known devices, mentioned herein, are effective only in the event of the breaking of a certain belt or transmission member 35, but if the engine races from any othercause, such as by the breaking of another belt, the breaking of a .shaft,-or the loosening of a pulley on the shaft, the arm 36 cannot swing down to yoperate the valve-controlling mechanism. Therefore, to meet the contingencies above the, coperating devices 4 and 5, theiirst `being attachable to and adjustable on lthe `arm`16, and the second being attachable`r to and adjustable on the shaft 22." VThe adjustment of the disk V21 ofl the device 5 along the shaft 22 brings the member 19 in vposition to move into the path ofthe member 4 provided the latter is properly adjusted on the arm l16; but it should be understood that the adjustment of the spring l24 also determines whetheror not the member 19 moves out sufliciently far, at a given Vrate of speed,to strike and push .the Vmember 4. These relative adjustments are important because it is not alwayspossible to set the engine and the machine which it drives inV such position relative to one'another that the member 19 will strike the member 14 without adjustment of one or the other of these members.v `M0reover, by adfjusting the'member 4 fartherV vaway'from the member 19, a greater speed is required to cause theAv latter to move by centrifugal force into Contact with' the member 4; and moreover," by increasing the tension ofthe spring 24, 'argreater speed is required to throw the member 19 out into positionfor Vpushing the member 4. f f

It is not intended to limit this invention tothe exact detailsof construction and ar-A rangement shown and described, but changes may be made-within'the scope orV inventive ideas as implied and claimed.' i

. What is claimed asmy invention is:

1; The combinationwith an engine and, an engine-controlling device, the latter in- 4cluding a governorfcontrolled valve-'stem and means'engag'ed with said valve-stem to control the valve-stem in opposition to said governor, said means including a trip-arm, off an extension att-achable to said trip arm,

a machine operable by said engine and including a rotary shaft, and a rotary tripping device attachable to said rotary shaft Yso as to be rotated with the latter, said rotary tripping device including pivotally mounted spring-held pusher adapted to be thrown by centrifugal forceinto a position to engage and push said extension of the trip-arm for actuating the latter.l n

2. The combination with an engine and an engine-controlling device, the latter including a governor-controlled valve-stem and means engaged with said valve-stem to control the valve-stem in opposition to said governor, said means including a trip-arm,

of a tubular trip-extension attachable to and adjustable longitudinally of said arm for extending the latter, said tubular tripextension having the free end'portion of said arm seated therein and being provided with means to secure it inits different adjustments, and a rotary tripping device operable by said engine and including a centrifugally operable pusher to engage with and actuate said trip extension.

3. The combination of a valve-stem, a shaft, a trip-arm on said shaft and operable by the latter to control a valve through the medium of said valve-stem, a ratchet-wheel mounted for rotation on and independently of said shaft, a spring` connecting said shaft to said 'atchet-wheel, a pawl engaged with said ratchet-wheel, an arm connected to said pawl and operable to actuate the latter, an adjustable trip-extension on said arm, and a rotary tripping device including a pusher mounted for outward movement into a position to engage with and push the free end of said adjust-able extension, said pusher being operable by centrifugal force so that said outward movement varies according to the variations of speed of said rotary tripping device, whereby the adjustments of said trip-extension provide for its engagement by Vsaid pusher at various maximum speeds of said rotary tripping device.

In testimony whereof I have hereunto set my hand.

oLAYToN `sr. JOHN.

Images