US863782A

US863782A - Governing mechanism for turbines.

Info

Publication number: US863782A
Authority: US
Inventors: John G Callan
Original assignee: General Electric Co
Current assignee: General Electric Co
Priority date: 1907-02-05
Filing date: 1907-02-05
Publication date: 1907-08-20
Anticipated expiration: 1924-08-20

Description

m 8633821 PATENTED AUG. 20, 1907:

. J. G. OALLAN.

GOVERNING MECHANISM FOR TURBINES.

APPLIGATION TILED FEB. 5. 1907.

Witnesses:

No. 863,782. PATENTED AUG. 20, 1907. J. G. GALLAN. GOVERNING MEGHANBM FOR TURBINES.

' 5 APPLICATION FILED IBB.5. 1907.

3 SHEETSSHEET 2- Witnesses: Inventor;

Waflan 3 y oqtiiy No. 868,782. ,PATENTED AUG. 20, 1907'.

JLG. GALLAN.

GOVERNING MECHANISM FOR TURBINES.

APPLICATION FILED FEB. 5. 1907.

s SHEETS-SHEET s.

UNlTED STATES PATENT UFFMZEO JOHN G. QALLAX. OF LYNN. MASRAGHUSETIS, ASSTGNOR TO GENERAL'ELECTRIC (())il.\NY, A CORPORATlON Ol NEW YORK.

Specification of Letters Patent.

Patented Aug. 20, 1907- Application filed February 5, 1907. Serial No. 355,824.

To all whom it may concern,

Be it known that 1, JOHN G. CALLAN, a citizen of the United States. residing at- Lynn, county of Essex, State of Massachusetts, have invented certain new and useful Improvements in Governing Mechanism for Turbines, of which the following is a specification.

My invention relates to governing mechanism for turbines, particularly those wherein a regulator or a valve of the puppet type or a plurality of separately or successively actuated valves are employed to control the flow of motive fluid through the nozzles or other discharging devices of the turbine. It is desirable to control positively the position of such a regulator or valve from the time it leaves its seat until it reach es a position where it is fully open and to hold the valve at points intermediateof its extreme position, locking it firmly at these points, so that the unbalanced forces cannot move it and thereby alter the speed of the turbine. I

The object of my invention is to improve the construction of the governing mechanism, rendering it mechanically simple and of few parts and so constructing it that the regulator which is disconnected when it is either fully closedor fully open, may be rigidly locked at various points between the open and closed positions, and is moved by a step-by-step movement, the extent of the steps being determined by a load responsive device. I

The invention is preferably used in connection with turbines, and is applicable to a single stage or to a multi-stage machine. Nozzles or other fluid discharging devices of any suitable character convert the pressure of the motive fluid into velocityand deliver' it to thewhecl buckets of the turbine, Where the energy is abstracted. :The admission of fluid to the discharging devi "e's'is controlled by separately actuated valves,

rid one valve may control one nozzle passage or a num:

ber greater than one, as desired. Part of the valves are normally open,..a part normally closed, and at. Ieastone valve moves frequently for regulating purposes. The actuating mechanism for the valves is so arranged that the valves can open and close one after the other in response to variations in load, and so that one or more of the valves can be locked intermediate the open and closed positions.

My invention will best be understood in connection with the accompanying drawings showing one embodiment thereof, in which i I Figure l is an end elevation of the valve actuating mechanism: Fig. 2 is a longitudinal section of part of the mechanism shown in Fig. 1 Fig. 3 is a plan view of the mechanism shown in Fig. 1 as viewed on line 33; Fig. -'i is an end view partly broken awayto illustrate the locking device; Fig. 5 a view showing the connection l betweenxthe actuating means and the valves; Fig. 6 a diagrammatic view showing the relation of the gov crnor and other elements of the device; Figs. '7 to 11, inclusive, diagrammatic views showing the relative positions of the parts during operation, and Figs. 12 and l3 views of a detail of the actuating mechanism.

in the embodiment of my invention shownin the drawings the general relation of the parts is shown in Fig. 6 in which 1 isa shalt driven from the turbine at a. speed of about 100 revolutions a minute and carrying a crank 2 which, through the connecting rod 3. oscillates a l ver or actuator 4 loosely mount ed upon or concenl1'i(' with the valve actuating shaft 5 by means of which the valves are llltWttl. The valve actuating shaft 5 carriesbosses, (i, 6" each boss being provided with a tooth T. 7; as shown in Fig. 5. It will be noted that these tccth are set in a staggcrtal relation to each other so as to [oi-m a piral about the rock-shaft and cooperate with notches 8, S". in slides 9. 9, rigidly attached to the stems l0, l of the regulators or valves 1], by means of which the flow 01' fluid to the turbine is controlled, each tooth and cco 'ita'ating notch forming an actuator for the respective valve and being so related that when the valve ll is in either of its extreme positions, the tooth is out of engagement with the notch in the slide and the valve is entirely free from the valve actuating shaft 5. When thc'valvc is entirely open it held in that position by the pressure of the fluid upon an effective area equal to that of the valve stem: when the valve is closed the pressure of the fluid holds it closed by acting upon an effective area equal to the difference between the art a of the valve and that of the valve stem.

As shown in Fig. 5, the relation of the teeth 7, '7, to each other is such that when the shaft is rotating in the direction of the arrow, and the tooth 7 is leaving the notch 8, after havingmovcd the slide 9 to fully open the valve connected thereto, the tooth 7 is just engaging 'the notch 8 to .move the slide 9 and thereby open the valve connected to said slide. By this arrangement the valves are opened and closed ue: t

The valve actuating shaft is-drivcn by the engine actuated vibrating lcvcr 4 by means of clutching mechanism which rigidly connects the lever 4 to the shaft 5, and the lever 4 has a range of movement suflicient to open or to close all the valves at. one movement, if desired. As shown in Fig. 1, the lever 4 is provided with dogcarrying arms 12. each of which carries at the outer end thereof pivots 13 on which sleeves 1-1 are loosely mounted. On the inner end of the sleeves, as shown in Fig. 3, are mounted dogs 15 and lo, the outer ends of the sleeves carrying riders l7 and 1S keyed thereto, while springs l9 tend to move the dogs to engaging position. Any othcr means for rigidly connecting the dogs and riders can be used instead of the sleeves. A ratchet 55 swings to the right and the rider 17 passes over the (30 projection 17 carried on auxiliary rider '17", as shown 65 the dog if) does not engage the ratehet disk 20 unl: ss 1 gear 31 and the rack 32 and is carried on a governor arln 1'10,

disk 20 actuating the shalt 5has teeth 2t engaged by the the end of the rider l7 has passed beyond the edge oi dogs l5 and to when the dogs are in operative position. the shield-plateadistanee e ual to the width t a tooth A shield'plate 22 mounted eoneentrit-ally with the et-non the disk. thereby insuring that the dog will eointer 01' the are described by the pivots l3 engages the pletely engage with the tooth ot' the ratehet disk.

5

riders

17 and 18, and thereby moves the dogs to inept r- Since the lever -l is normally diseonneeted lrotn the 70 ative position out of engagement with the ratchet disk valve actuating shalt 5, it is neeessary that some sort 20. The position of the shield platev and thtreby the l oi locking means be provided to maintain the valve extent of movement given the ratelitt disk 20 i: deteractuating shaft in the position in whieh it is left when mined by a governor responsive to eltanges in load on the'dogs l5 and ll) are lifted out of engagement with the 10 the turbine. 'atehet disk 20 by the aetion oi the shield plate '22.

The lever 4 oscillates through an are of unvarying The form of meehanism whit-h I have shown for aeeomextent, and the shield plate :22 is s.) proportioned that -plishing this result is diselosed in Figs. 1. l and t. in when in the normal pt'sition. as shown in Fig. l, it which a controlling arm 23, rigidly mounted on the holds both dogs and lit in imperative pesititzn shaft 5. has an extension bh'the outer surface of whit'h 15 throughout their entire range oll movement. it tl e is made in the form of an arc with the shalt 5 as the 80 speed deereases the shield plate is moved to the left in neuter and \\'l]l('l1 swings within a lot-king easing '25 Fig. 1 and the rider l7 will drop oil the end tl the having a surface in the form of an are concentric with shield plate when the lever 4 moves to the right. therethe circle described by the outer surlace oi the extenby permitting the dog l5 to assume an operative pt sision 2-1. As shown 'in Fig. 4, the extension 24 is protion with relation to the l'tlttll ti disk '20. As the lever vided with oppositely disposed int-lined guides 26 with S5 4 starts bat-k to the let't. the dog l5 will engage one of whit-h r-otiperate balls or rollers 27 and Z8. normally the teeth 2i. thereby rotating the ratehet disk 2t) and loreed toward the position shown in Fig. 4 by adjustshal't 5 elot-kwise until the rider 1? eneounters the ede'e able springslt) mounted in reeesses in the extension -l. of the shield plate 22 and tllitllg'ttgt's the dog from the The int-lined guides 26 are so related to the lot-king easratt'liet tooth. and eattsina the partial opening ti one i log that when the balls or rollersare in the position 00 valve or the opening of one or more valves, depending shown in Fig, 4 they are in engagement with the guides upon the extent of rotation of the shaft 5. l and with the loeking easing, and thereby ltit'k the ('llll- Y Sint'e the dog does not always have an opportunity t trolling arm 23 against movement in either diret-tion.

to drop into ltlll engagement with the to. th only the The ratchet disk 20. which is loosely mounted on the 30 points ol' the tooth and the dog engage and are apt to l shat't5. has a log 30 extending through a slot between 95 be broken by the shoek. in order to avoid this objeei the. guides 26, the length of \Vllitll slot is greaihr than tion and possible breakage, i provide means liar insurthe width of the lug. the outer end oi the lug being ing that. engagement of a dog with the ratchet disk shall l formed to engage either ol' the balls or rollers 27 and its not take plat-e until the riderlil'ting the dog to imperal when the lug is moved to either end of the slot. The

live p i -i 1 h move i anc o at l t one ooth parts are so proportit'ined that when the lug is llil'fl'ttl we of the disk beyond the end of the shield-plate. If such clockwise in the: direetion ot' the arrow in Fig. -l. the means is not provided. there is a possibility that when lower end thereof engag s the ball or roller 27 and til'ivt-s theshield-plate is moved very slightly the rider will it along the inclined guide 2t; out ol engagement ith over-travel the shield plate by a very snail amount..- the loeking easingbel'orethelugt-omes into engagement 40 as the lever 4 moves forward. resulting in the deg dropwith the end or the slot between the guides '16.,1 lit-reto; ping into slight engagement with the tip oi a tertli. by leaving the eontrolling arm 33 free to move in the moving the disk a very short distance as the enginedirection ot' thearrow. After the arm has been undriven lever starts back, and almost iiinnediately belocked, the lug 30 engages the wall at the end of the ing thrown out of engagement with the tooth by the slot between the ineliued guides 26, thereby rigidly rider engaging the edge of the shield-plate. connecting theratehel wheel 20 with the eontrolling t it) One iorm ol ,the mechanism which l have devised arm 23 and moving the valve aetuating shalt .\s for securing this result is shown in Figs. 12 and l3. soon as the pressure of the ratchet wheel '30 upon the although the same result may be obtained by many shall; 5 is relieved the ball or roller '27 forced bat-k to other forms. In the form shown in these figures the lot-king position-iby the attion oi the spiral spring 29. 5O rider 17 is provided with a spring blade 17 securely I and the controlling arm is locked in the position in ii?) attached thereto and formed as shown in Fig. l2. earrywhich it was left when the ratehet wheel 20 eeased to ing at the. free end thereof an auxiliary rider 1?" which actuate it. The same operation, of eourse. takes plai'e normally engages the surface ol' the shield-plate at a when the ratchet disk 20 is moved eounter t'lot'kwist, point in advance of the rider 17. As the lever 4 such movement causing the ball or roller 25 to move out of looking position, thereby" permitting the eontroll fill edge ot' the shield-plate 20, the dog 'l5is held in inoperaling arm 23 to be moved in a direetion opposite the tive position until the auxiliary rider 17 drops oil the arrow. I end of the shield-plate and permits the dog to engage I The connections by means of whit-h the load responthe disk. As the lever -l swings back to the left. the l sive device alters the position oi the shield-plate J2 l areshown in Figs. 1 and 2. r\ spur gear Ell. rigidly at- 1'1 in Fig. 13, passes underneath the lug .17 on the shieldtaehed to the ratehet disk 20. and moving therewith. l

plate and the dog 15 is not lil'ted out of engagement mounted on the shaft 5. eoneentrieally with a raek with the disk until the rider 1? ent'ountelsthe edge of in the form of a seetion of an intern-til gear mounted on the shield-plate. The result of this arrangement that l the shield plate. .-\n idler pinion 32, meshes with the v l 34 loosely mounted on the shaft 5 and controlled through a link-work 35 from the governor or speed responsive device 36. Since the ratchet wheel 20 and spur gear 31- are normallystationary, the movement of the governor arm 34 and the pinion 33 in either direction causes a movement of the shield plate 22 in the same direction to permit either the

dog

15 or 16 to drop into operative relation with the ratchet disk and cause a movement of the ratchet disk 20 and thereby a movement of the valve actuating shaft 5.

1f the speed of the turbine decreases, the shield plate 22 is moved to the left in the direction of the arrow in Fig. 1, and as the lever 4 oscillates to the right the rider 17 drops off the end of the shield and permits the dog 15 to drop into engagement with the ratchet disk 20. The dog slides over the ratchet teeth until the lever 4 reaches the end of its travel, and as the lever 4 begins to move back toward the left, the 7 dog 15 engages the ratchet disk and moves it. The first movement of the ratchet disk drives the ball 28 back into inoperative position, thereby releasing the controlling arm 23, and the lug 30 on the ratchet wheel 20 thenengages the controlling arm 23 and moves it and the shaft 5. The rota-' tion of the ratchet disk 20 is transmitted to the spur gear 31, rigidly attached .thereto, and the-rotation of the spur gear is transmitted through the idler pinion 33 to the rack 32. The relation of the gearing is such that a rotation of the spur gear 31 in the direction of the arrow causes a movement of the shield 22 in the opposite direction; and the rate of movement of the shield is the same as that of the ratchet wheel 20. The result of this arrangement is that when the dog 15 engages the disk 20 and moves it in the direction of the arrow, the shield plate 22 begins to move in the opposite direction toward the rider 17 and at the same rate as the shaft 5 is being moved by the ratchet disk. When the rider 17 engages the shield 22, the dog 15 is lifted out of engagement with the rat chet disk, the ball 28 is returned to locking position by the spring 29 and the controlling arm 23 isinstantly locked in the position occupied by it when the dog. 15 is disengaged from the' ratchet disk 20. If,

therefore, the (log 15 moves four teeth beyond the end-'- of the shield plate and then begins to more the ratchet disk in the direction of the arrow, the sh eld plate 22 will move in the opposite direction to meet the dog, and the shield plate will move the distance of two teeth to the left while the ratchet disk is moving the distance of two teeth to the right. Since the dog is liftedto inoperative position when the rider meets the shield .plate the net result will be a movement of the valve actuating shaft 5 equal to two teeth of the ratchet wheel. The next oscillation of the lever 4 to the right will, carry the dog 1.5 two teethbeyond the end of the'shield plate (I the same operation will be repeated, the result this ne being the movement of the valveactuating shaft 5 a-di'stanee of one tooth of the ratchet disk 20 in the same I direction as before and the return of the shield plate 22 to normal position. The lever 4 furnishes the power not only for actuating the shaft 5, but also for returning the shield plate 22 to normal position. so that the only work required of the governor is that necessary to shift the governor arm 34 to load on the turbine.

The relation of the parts of the governing device under varying conditions, is shown in Figs. 7 to ll'inclua position depending uponihe sive. Fig. 7 shows the rocker arm in mid position and the shield 22 in normal position, while Fig. 8 shows the rocker arm in its extreme position to the right with the shield still in normal position. Fig.1] shows the rocker arm in its extreme position to.th'e left with the shield in normal position.- It is evident from thesefigures, therefore, that under normal conditions, neither of the

pawls

15 or 16 engages the ratchet wheel. In Fig. 9, however, the shield 22 has been moved to the left to such an extontthat the pawl 15 moves over two teeth of the ratchet wheel when the rocker arm 4 extreme position to the right; while Fig. 10 shows the rocker arm returning from its extreme position to the right with the lifter 17 reaching the edge of the shield 22 and about to 'move the pawl 15 to inoperative position. I

When a plurality of regulators or valves control the flow of fluid to the turbine, the spiral arrangement of the teeth 7, 7 on the valve actuating shaft 5maly cause all of the valves to be either open or closed and'disconnected from the valve controller, or one valve may. be in some intermediate position and under positive control. If a sudden increase of load occurs, the valve opened to the full extent quickly and in succession, while the last valve moved, assuming that the load is not satisfied by a given number of open'valvcs, will be locked at some point between its open and closed positions, whereby the flow of fluid is quickly and accurately adjusted to the load on the turbine. Whd'n the load .dec'reases the reverse operation takes place. 11' d esired, the teeth on the rock shaft may be set in-such relation to each other that several valves are in an intermediate position at the same time, or varying distances from open or closed positions. thereby throttling a plurality of inlet ports instead of one.

My invention maybe applied to any type of prionmovr using motive fluid, but is particularly adapted to turbines to which it is preferablyapplicd in the mannozzles for deliveringmotive fluid to the buckets of the-turbine-wheel 40. In this arrangement one valve controls two discharge nozzles, but it is apparent that one valve can control either one nozzle or a plural Hy of nozzles, and that a plurality of suchvalves may he used on a single turbine for controlling the inlet to the turbine and also the passage offluid through the various stages, if theturbino is mulIi-stagc. and that all the valves may be controlled from one actuating m chanism. a

In accordance with the provisions of the patent statutes, 1 have described the principle of operation of my invention, together with the apparatus which 1 now consider to represent the best cinlmdinu-nt thereof; but I desire to have it understood that the apparatus shown is only illustrative. and that the invention can be carried out by other means. I

What I claim as new and desire to secure Patcut of the United States, is

1. In a governing ineclninisin, the combination oi rah-cs reaches its controller 5 is moved rapidly through the proper dis-. tancc,'and a number of valves depending on the extent of movement of the valve actuating shaft 5 will be ner shown in Fig. 11, in which the turbine casing 37 is provided with a port or opening 38 which in turn has. a. partition 39, thereby forming two parallel discharge at either the saine controlling the passage of iillltl. an actuator for each valve. :1 toothed disk for moving: the actuators which is common thereto. a constantly vibrating lever. means for transmit ting motion from the lever to the disk. a device responsive to load changes for controlling the action of 'said teans which causes it to impart a step-by-step movement to the disk. and mechanism actuated by the disk which decreases the length of the steps as the disk is moved under the culltrol. of the device to (i use the valves to more nearly satisfy the load conditions.

l. in a governing m chanism. the conibination oi a plurality of valves controlling the passage of tluid. an actuator for opening and closing each of said valves. :1 toothed disk common to the actuators and valves. a shaft eounnon to the disk and actuators. an oscillating lever for rocking the shaft. dog's carried by the lover a rran :ed to move the disk a one direction or the other in response to load changt. a shield plate pivotall v supported on said shaft and controliin i' said dog's connections between the disk and shield-plate for causing; any movement of the disk to si multaneously move the shield-plate. a speed r sponsive de- .ice. and a connection between the speed responsive device and the shield-plate.

21. In a governing mechanism. the combination ot a valve for controlling; the passage of fluid. a toothed disk for opening and closing the valve. a constantly vibrating inevnher. dogs carried by said metnber and arranged to enzage the teeth on the disk. :1 shield-plate responsive to changes in load [orcontrolling the action of the dogs on the toothed disk. a support for said shield-plate. and connections between the disk and shield-plate for causing any movement of the disk to simultaneously move the shield-plate to reset the shield-plate after the valve has been moved.

4. In a governing mechanism. the combination with a valve for controlling the passage of fluid. a toothed disk for opening and closing theBvalve. a constantly viln'ating member. C1)1)t)sit'el actin5., dogs carried by said member. one being arranged to move the disk in one direction step by step and the other to move it in the opposite direction step by step. a device responsiv to speed changes for controlling the action of both dogs, and connections between the disk and shield-plate for causingany movement of the disk to simultaneously movethe shield-plate to restartsaid device to normal position after the valve has been moved.

5. In a governing mechanism, the combination of valves arranged to control the passage of tluid.a toothed disk. means for opening and closing the valves successively. a vibrating member. oppositely acting dogs Ctli'l' itd by said member and arranged to engage the teeth of said member and move it step by step. a movably-supported shield-plate for controlling the action of the 'dogs connections between the disk and shield-plate for causing any movement of the disk to simultaneously move the shield-plate. a shaft go ernor. and a connection between the shaft governor and theshicld-plate for moving said plate. I

(i. In,a governing mechanism. the combination of a pinrality 0t valves for controlling the passage of motive fluid? an actuator for each valve. a shaft common to said actuators, the actuators being arranged to open and close the. valves in predetermined order. a toothed disk mounted on the shaft for moving it'step-by-stop in one dir ction or the other to meet the load conditions. a source of power. means mounted on the shaft for imparting from said source to the toothed disk a step-by-step motion and decreasing the length of the steps as the disk is moved and the valves more. nearly satisfy the load conditions. and a device re sponsive to changes in speed for controlling the action of said nit-ans.

T. In a governing mechanism. the combination of a phe rality of valves controlling the pass. cc of motive tiuid. an actuator for each of the valves. a shaft common to the actuators. a toothed disk mountcdon the shaft for moving all of the actuators. a vibrating, lever freely movinc about the axisof the shaft, dogs carried by the lever which are arranged to engage the teeth on the disk and move it in one direction or 'the other as the load t' tic-es, a shieldplate movable about t'heaxis of "the shaft for controlling the action of the dogs in response to changes in speed. and connections between the disk'and the shield-plate for causthe valve. amember which has a to and said in: any movement 01' thedisk to simultaneously restore the shield-plate to normal position after one or more of the valves have been moved.

R. in a governing mechanisni. the combination of an admi. -ion valve. a toothed disk for opening. and closing fro motion for moving the disk. a shield-plate t'or controlling the action at said member on the valve. a speed responsive device for controlling the action of the shioldplatc. and connections'between said disk and shield-plate for causing any movement of the disk to simultaneously move the shield-plate to restore it to normal position after the valve has been moved in response to changes in speed.

.1. in a governing mechanism. the combination of a plurality of valves for regulating" the passage. of uotivc lluid through a turbine. a device which has a constant to-and-l'ro movement. a toothed member. means for transmitting motion from the device to the member. a common actuating means for the valvesdriveu by said member. mechanism responsive to load changes which controls the connection between the device and the toothed member and causes the device to-impart a step-by-siep movement to the member. and means actuated by the member which I varies the length of the steps and makes the extent oi each step other steps.

id. in a governing mechanism. plurality tendency inc. a member ommon to the valves having a movement greater than is required .to move 1'. single v lve, devices for positively connecting each valve to said member, devices being in action only when one or more valves are being moved between extreme positions, and a governor controlled means in response to load chances.

ii. in a governing; mechanism. the combination with a regulator moved to control the apparatus. of an actuating mechanism disconnected from the regulator in either ex rei'w-i position thereof. said mechanism engaging the regulator to positively control it between said extreme positions and to lock it stationary at. any intermediate point.

12. in a governing mechanism. the combination with a regulator moved to control the apparatus. of an actuating' mechanism disconnected from the regulator in either extreme position thereof. said mechanism engaging the regulator to positively control it between said extreme positions and to lock it stationary at any intermediate point. and a controller regulating the extent of movement of said regulator from either-extreme position.

11'. In a governing mechanism. the combination with a regulator moved to control the apparatus. of an actuatingmechanism disconnected from the regulator in either extreme position thereof. said mechanism engaging the regulator to positively control it between said extreme positions and to.lock it stationary at. any intermediate point, and a load responsive device regulating the extent of movement of said ree'ulator from either extreme position.

a deiinite proportion of the extent of the the combination of a oi unbalancedvalves each of which has a it. In a governing" mechanism. the combination with a plurality of regulators moved to control the apparatus, of an actuating mechanism'moving said regulators in succe sion and disconnected from each regulator in either extreme position thereof, said mechanism engaging each of said regulators to positively control it between said extreme positions and to lock it stationary at any intermediate point.

tion with a plurality of regulators movedto control the turbine, of an actuating mechanism moving said regulators in succession and disconnected from each regulator in either extreme position thereof before engaging the next said mechanism engaging each of said regulators to positively control it between said extreme positions and to lock it: stationary at any intermediate point.

it}. in a governing mechanism for turbines. the combination with a regulator moved to control the turbine, of an actuating member, connected to the regulator only while to sudden movement both in opening and closfor moving the said member 15. in a governing mechanism for turbines, the combina-v exerting pressure thereon to move it and disconnected therefrom when the pressure is relieved, and 'a lock holding the regulator when disconnected.

17. In a governing mechanism for turbines, the combina,

tion with a regulator moved to control the turbine of an actuating member moving said regulator and releasing it at any point of its travel, and a lock holding said valve at the point of release.

18. In a governing mechanism for turbines, the combina- I tion with a regulator moved to control the turbine of an actuating member moving said regulator, release mechanism disconnecting the actuating member at any point holding the regulator responsive device controlling the action of the release mechanism.

1-). In a governing mechanism for turbines, the combination with a valve controlling the fiowof. fluid to the turblue, of an actuating member moving said valve step by step and releasing the valve at each step, and a lock hold ing said valve at the point of release.

20. In a governing mechanism for turbines, the combina tion ,with a valve controlling the flow of fluid to the turbine, of an actuating member moving said valve step by.

step and releasing the valve at each step, a load responsive device controlling the amplitude of each step, and a lock holding said valve at the point of release.

21. Ina governing mechanism for turbines, thecoznbination with a valve moved to controtthe' turbine, of a valve ating member and the valve actuator. I

22. In a governing mechanism for turbines, the combination with a regulator moved to control the turbine, of an actuating member connected to the regulator only while in motion and disconnected therefrom upon coming to rest, and a lock for holding the regulator when disconnected said lock being released when the connection with the regulator.

23. In a governing mechanism, the combination with and then'rigidly connect the actuactuating member is in cooperating members one of. which is toothed, one of said members being continuously moving and the other con of aspeed resnonsive congagement with the disk during a relative movement of dog and disk of more than one tooth.

25. In a governing mechanism, the combination'with a toothed disk connected to a movable regulator, of an oscilto engage and move said" disk, :1 disengaging member connected to the dog, a'speed coiinerating with said dislatingmember carrying a dog responsive controller normally I engaging member to hold the dog out of engagement with the disk and moved to permit said oscillating member to carrythe dog beyond the end engagement with'the disk, and a rider engaging the controller to hold the dog out of engagemenLwh'en'moving in one direction butnot in the other and permitting engage In witness whereof, I have hereunto set my hand this second day of February, 1007.-

JOHN G. CALLAN. Witnesses:

JOHN A. MCMANUS, 317.,

ofjthe controller and into 1