US1206763A - Control mechanism for elevators. - Google Patents

Description

A. B. ROVER.

CONTROL MECHANISM FOR ELEVATORS.

APPLICATION FILED DEC. 27, I9l2.

Patented Nov. 28, 1916.

4 SHEETS-SHEET I.

A. HOVER.

CONTROL MECHANISIVI FOR ELEVATORS.

APPLICATION FILED DEC. 27. 1912.

APatented Nov, 28, 19H5.

4 SHEETS- SHEET 2.

Wz'ine J m A. B. ROVER.

CONTROL MECHANISM FOR ELEVATORS. APPLICATION FILED DEC. 27, 191.2.

Patented Nov. 28, 1916.

4 SHEETS-SHEET 3.

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A. B. ROVER.

CONTROL MECHANISM FOR ELEVATORS, APPLICATION FILE/D DEc.27,1912.

3,266,763. Patented Nox?. 28, 19m.

4 SHEETSfSHEET 4.

mr .mums pnsxs ca Puomvuma., wAsnmunw, vV cv ADOLPI- B. ROVER, 0F BINGHAIVITON, NEW YORK.

CONTROL MECHANSM FOR ELEVATORS.

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Application led December 27, 1912.

To all whom it may concern Be it konwn that I, AnoLrH B. ROVER, of Binghamton, inthe county of Broome, in the State of New York, have invented new and useful Improvements in Control Mechanism for Elevators, of which they following, taken in connection'with the accompanying drawings, is a full, clear, and exact description.

This invention relates to certain improvements in elevato-rs for passenger or freight service involving the use of power-driven means for raising and lowering the car and a suitable controller for governing the action of the power fluid upon said power-driven mea-ns, reference being had to my pending application, Serial No. 738,901, filed Dec. l2, 1912, containing the generic claims to the hydraulic means separate from the main controlling valve for operating said valve, in combination with means for controllingthe action of the hydraulic means.

The main object is to control the main valve of the hydraulic lift through the medium ofra hydraulic motor and suitable valves operable at will for controlling the flow of the pressure iiuidto the motor, thus making it impossible to suddenly start or stop the car as in cases where the main valve is opened and yclosed directly by the operator.

ther objects and uses will be brought out in the following description.

Figures l and 2 are enlarged inner side and vfront elevations respectively of thev lower portion of the controlling apparatus omitting the main hydraulic cylinder piston and car. Figz is a still further enlarged side elevation, partly in section, of a double water motor and pipes leading thereto, showing also in section the system of valves and piston motor for controlling the flow of the pressure fluid, as water, to the motor.y Fig. lis an enlarged vertical sectional view through t ie motor case taken approximately on line i-4:, Fig. 1, showing the motor wheels, motor shaft, gear train and clutch iny elevation. Fig. 5 is a vertical sectional view of the clutch, adjacent gear and sprocket wheel and also the clutch-operating means shown in Fig. e. Fig. 6 is a longitudinal vertical sectional view of the main controller valve and its actuating rack and pinion, the valve being linits normal or neutral position for stopping the car by cutting olf the supply and exit of the pressure fluid Specicaton of Letters Patent.

Patented Nov. 28, 19,16.

Serial No. 738,900.

to and from the cylinder. Fig. 7 is a detail A vertical sectional view through the upper portion of the main controller valve case showing a portion of the rack and pinion and also the operating shaft with the actuating drum and sprocket thereon.

In order that my invention may be clearly understood havek shown a portion of the hydraulic lift or elevator comprising a cylinder A* in which-is vertically movable a piston -ocarrying at its upper end a car not shown.

The cylinder A- is connected in the usual manner by a pipe -cto a main controller or valve case -1 having an inlet pipe -Q-and a relief pipe ,-3 communicating with the valve case -1- in planes above and belowthe point of connection between the pipe -0- and said valve case for purpcseshereinafter more fully described. u

The main controller is shown more clearly in Fig. 6 and is provided with a double disk valve -4 movable in the case -,-1- and secured to a valve rod -5- having an upwardly extending tooth rack -6- meshing with a pinion lon a rotarv shaft -8-, the latter being journaled in the upper end of the valve case 1 some distance above the valve. Y

YWhen Vthe valve is in its normal or neutral position, its lower disk closes the port leading into the pipe -cbetween the opposite ports which communicate respectively with the inlet pipe -2 and relief pipe -3- while the upper disk is normally disposed Some distance above the inlet pipe, thereby equalizing the pressure on the valve and allowing it to be moved freely in either direction. For example, when it is desired to raise the car the valve #-4- is moved downwardly from its normal position so as to connect the pressure supply pipe with the cylinder of the hydraulic lift through the valve case and vpipe -c, while on the other hand, if it is desired to lower the car, the valve Alwill be raised'from itsnormal position to co-nnect the cylinder with the relief pipe -3-w through the pipe -0- and valve case -1-, said valveV being' shifted throughthe medium of the rack -G-f and meshingy pinion in the manner presently described.

The shaft -8-'-, upon which the pinion -7 is keyed, extends laterally some distance to one side of the valve case -1- and is provided with a relatively large drum -9 tight thereon around Which an endless cable l0- is Wound With one or more turns so as to produce the desired gripping power to permit the main valve to be opened and closed independently of the motor if necessary.

Auxiliary controller for mali/1t valve-In order to obviate the dangers and excessive strains incidental to the direct operation of the main valve, I prefer to operate said valve through the medium of a hydraulic motor -12 and voluntarily operated means for controlling the action of the motor, thereby causing a uniformly steady Vand gradual opening and closing movement ofy the main valve and a similar gradual starting and stopping of the car.

The motor l2- is preferably of the dupleX type for reverse action and consists of a lcase *13- having separate chambers -llin which are mounted separate Water Wheels l5- each mounted upon and secured to a common shaft -16-, said case being provided ivith inlet ports -17- communicating With their respective chambers -14- but at opposite sides of the axis of movement of the Water Wheels V15 so that the inflowing power fluid, as Water, under pressure acting upon the Water Wheels one at a time Will rotate the motor shaft 16- in reverse directions, the casing being provided with an outlet or branch pipe 1S- common to both of the chambers -l-/las shown more'clearly in Fig.' 4.

Any suitable mechanism may be employed for transmitting motion from the motor shaft -16-- to the main valve -4l-, but in order that the main valve may be moved slowly and gradually, the motor shaft -l6-- is connected byV a speed reducing gear train 1S- to a gear clutch -20- Which is loosely mounted upon a stationary counter shaft or stud 21- on the motor case -l3 as shown more clearly in Figs. l, 4 and 5.

rThe other gears of the train, aside from the pinion on the motor shaft, 'are also mounted on suitable studs 21 on the same side of the gear case as shown in Fig. 3.

A cone clutch -22- is slidable axially upon the stud -2linto and out of frictional engagement* With the gear clutch -20- and is provided With a sprocket Wheel -23- Which is connected by a link belt --23-.to a similar sprocket Wheel -8- on the main valve shaft -8 so that when the clutch -22 is thrown into frictional engagement With the adjacent face of the gear -20-,' motion Will be transmitted to the shaft -8- and thence tothe valve -/l through the medium of the rack and pinion -6- and 7-, the direction of movement of the valve depending upon the direction of rotation of the motor shaft or rather upon the opening of one or the other of the ports -l7- as Will be presently described.

rThe motive fluid, as Water, is supplied to both of the ports 17- of the motor from the same source as that which supplies the main cylinder A- through the main controlling valve -land for this purpose I have provided the feed pipe -2- leading to the 'main valve case 1- With a branch motor supply pipe -24- which is connected to both chambers of the motor by a system of pipes and valves hereinafter described.

The motor supply pipe *24fis provided with a normally open cut-off valve -25- adapted to be closed at will by means of its rod or stem -77- when it is desired to prev-ent the operation of t-he motor -l2-, main valve -4- and car controlled thereby.

rlhe motorsupply pipe *2l-, after leaving the valve -25-, enters the central poi'- tion vof a double valve case or distributing head 2G- having separate branch pipes -27` leading to their respective ports 17- and chambersr -14- in the motor case 13- for supplying the motive fluid thereto, said valve case --26-V being provided with opposite normally opened valves 2S- one for each branch pipe -27- controlled by the movement of the main valve 4* for automatically cutting off the supply of the pressure fluid to the motor and thereby limiting the opening movement of l the main valve -flin one direction or the other from its neutral or normally closed position as hereinafter more fully described.

Each branch pipe -27- is provided withV a normally closed motor-controlling Valve -29 and a clutch-controlling piston motor -30-, the latter being` connected in the branch pipes -27- between their respective motor-controlling valves 29- and corresponding motor chambers 14- and` conl stituting parts of the clutch-operating mechanisms hereinafter described.

Motor control-As previously intimated, the Vvalves -29- control the operation of themotor and are adapted to be opened at Will one at .a time only by a suitable mechanism connected to Van operating member as 33 Within the car or by separate mechanism adapted to be opera-ted fromV any one of the floors.

The controlling member -33 may be connected through the medium of an equalizer 35- to the valves 29, the movable members of the equalizer being connected by the flexible lnembers -36- to the valve rods or stems -37- of the valves 29- so that when the controlling member 33- is moved in either direction from its normal neutral position, it Will open the corresponding valve 29` and leave its companion valve closed. This opening movement of either one of the valves -29- allows the motive fluid to open the corresponding piston w30* and to operate the motor -12 in one direction for opening themain valve -teither to the pressure pipe --2- or to the relief pipe -3-, thereby causing the operation of the car in one direction or the other according to which valve *29* is opened.

@latch-operating mechanism-. In order thatI the main controller valve --imay be operated simultaneously with and by the motor, I have made the operation of the clutch t-'22-' dependent upon the flow of the pressure iuidto each of the motor chambers l-fby placing in each branchfpipe -27- leading to said chambers separate clutch-.controlling piston motors 3U-a which, as previously described, are located in their respective branch connections between their respective valves #29- and corresponding chambers -14-- The piston motors -30- kare normally closed but are adapted to be opened by the pressure yof the motive fluid vwhen their corresponding valves *29.- are opened and this opening-movement of the pistons is em ployed to force the clutch *22,- into operative engagementy with the then rotating gear -QJOW asfollows: Each piston motor 73,0- i-s provided with an upstanding rod having a Slotted head v50-f in lifting engagement with a lever .51- and link f2-irespectively, the lever y 5l-- being pivoted at .-38 to the motor case as shown more clearly in Fig." 3 and extends laterally some distance across and beyondy thefupper end of the lower piston motor B0- so `as to rest in the slotted head oft-he co-rresponding rod while the link 52 rests in the slotted head --50`-'- of the upper rod and is pivotally connected -to the leve-r .-51- as shown more clearly in Fig. l.

The free end of the lever is eXibly connected by a. link -53- to one end of a centrally pivoted lever having Vits opposite end connected bya link 5ey to one end of a super-posed centrally pivoted lever -56, the latter having its opposite end connected by a link '57- yto an arm -.-58- projecting laterally from a cam -59 Which is free to turn on the stud -2land therefore coaxial with the clutch f22 as sho-wn in Figs. l, 4 and 5.

The lever .5,4- is pivoted to a part of the motor-supporting frame as -GO- while when kthe valves 2Q- are closed.

The rocking cam member -59- coperates with a similar but non-rotatable cam cam member fteis free to be moved aX- l ially by the rotation of its operating member --59-- to throw the 'clutch 22- into operative engagement with the gear -20-, thereby causing the motor to transmit motion to the main controlling valve -1 through the medium of the sprocket wheels S23- and -8- and chain -28.

TWhen the valves -29- are closed after having been opened by they operating member ,-33, the spring 4 61- will return the lever 5L- to its normal position and thereby restore the piston motors 30-y and clutch-operating member H-5S- to their normal positions, thus permitting the clutch 22 to be forced out of frictional .engagement with the gear n2O?- by means of'a f spring G8- Fig. 5.

' Automatic stop mech-mism for motor cmd ,main @alter-It is now clear that when the motor and main valve are once sety in motion, suitable means must be provided for limiting the movement of the main valve preferably by cutting of'the supply of pressure fluid to the motor and for this purpose I have provided the upper` end ofthe ving ends of valve-operating levers H73-,

Which, in this instance, are supported by links 74- on opposite ends of the valve Y case -26*'as shown more clearly in Figs. l, 2, and 3, the intermediate portions of said levers -73- being pivotally connected to the stems `of the opposite valves 2S- which are movable within said casing so that, as the main valve lis moved from its normal position in either direction, the valves 28e will be moved in the same di rection, thereby closing one of said valves 'While the other valve remains open, the

closed valve serving to cut oil thesupply of,

pressure fluid to the branch -27- corre spending to the previously opened valve -29- by Which operation the supply ot the pressure fluid to the motor is cut olf and, therefore, the action of the motor and .main valve is stopped. The main valve is now open and remains open until the car approaches its destination, whereupon the controlling member -33- is reversed to its other eXtreme position for closing the previously opened valve -29- and opening the other valve -29- which causes a reverse operation of the motor and consequent restoration of the main valve to its closed position and also restores the valves -28 to their normal positions, at which time the car will be stopped and the operator will then instantly return the controlling member -33- to its neutral position for closing the valve 29- last opened, thus stopping the motor. It is evident, however, that by closing the valve -25- the supply of the motive fluid to both of the valves --29- would be cut off, thereby stopping the motor and preventing` the operation of the main valve and hydraulic lift even though one or the other of the valves 29 might be opened. This valve -25-, therefore, constitutes a safety device which, when closed, prevents the operation ofthe motor and may be operatively connected to the doors of an elevator shaft in such manner that when any one of tie doors is opened, the valve willy be automatically closed to prevent the starting of the car until the door is closed, by which latter operation the valve will be re-opened. The automatic control of this valve by means of the doors leading to the elevator shaft forms no part of my present application and it is, therefore, unnecessary to further describe the same, but is somewhat similar to that shown in my pending application, Serial No. 775,380, filed June 23, 1913, except that it controls the operation of a hydraulic motor instead of the piston-operated cable-gripping device shown in said application.

Operation- The operation, brielly describedis as follows :-`issuming` that the main valve --/l, controlling valves -29- and pistons -30- are in their normal closed positions, as shown in Figs. 6 and 3, respectively, and that the valves -28- and controlling valve -25- are in their normal open positions, as shown in Fig. 3, under which conditions the car and motor will be at rest. Now, if it is desired to elevate the car, the operator will open the upper righthand valve 29,- Fig. 3, through the medium of the controller 33- which will cause the pressure fluid to raise the corresponding piston -30- sulficiently to allow such Huid to pass to the motor for rotating the latter in the direction indicated vby arrow Fig. 3. The raising of the piston -30- operates the clutch member -58- to Connect the motor-driven clutch member -20- with its companion clutch member -22-, thereby driving the sprocket Chain in the direction indicated by arrow z Fig. 1, to drive the main valve A- downwardly and connect the main cylinder -A- with the pressure pipe -Qffor lifting the car. As the main valve -flis driven downwardly by the motor, it closes the upper valve 28 Fig. 3, thereby cutting off the pressure fluid to the motor through the open valve -29- and consequently stopping the motor. The main valve remains open untilV the car reaches the desired height, at which time the previously opened valve -29 is closed and the other valve -29- opened by the operation of the controller-33- to the opposite side of its neutral position, thus causing the operation of the motor in the opposite direction for restoring the main valve d and upper valve -28- to their normal positions to cut off the motive fluid from the main cylinder and automatically stop the car, whereupon the last-opened valve 29- will be closed by the return of the controlling member S3- to its neutral position, in which position both of the valves 29- and main valve -4lwill be closed, the pistons -30- returned to their normal positions by the retraction of the lever 51- and the upper valve -28- restored to its normal open position. On the other hand, if it is desired to lower the car, the controlling member -33- may remain in its last-adjusted position, or adjusted thereto fromV its neutral position with the result that the lower left-hand valve-QQ- will be first opened to allow the motive fluid to lift the lower piston 30,- Fig. 3, and pass to the right-hand side of the motor for rotating the motor wheel in a reverse direction from that indicated by arrow -m-, the raisin@ of the lower piston --30-k serving to operate the clutch in a manner previously described for driving` the sprocket chain Q3-'in such direction as to raise the main valve --fl, and thereby connect the main cylinder -A- with the relief pipe -3-. rDuring this raising of the main valve --4, the lower valve 28-, Fig. 3, will be closed to ycut off the motive fluid from the motor through the open valve -29, thereby stopping the motor and main valve actuated thereby. rllhis leavesv the main valve open to allow the car to descend to the desiredy level, at which time the open valve 2Q- will be closed and the other valve -29 opened by the adjustment of the controller -33- to the opposite side of its neutral position, thus causing the operation of the motor to restore the main valve to its closed position and stop the car at such level, the pistons -30- being tlieirrestored to their normal positions through the medium of the lever -51- and spring -61-, while the lower valve e28- Will also be restored to its normal position through the medium of its connections With the main valve.

If is desired at any time to prevent the operation of the car through the medium of the motor -,12-, the normally open valve -25- may be closed by any suitable means and locked in such position until such time as it may be desired to permit the operation of the car through the medium of the motor.

1n my pending application, Serial No. 738,901, filed December?, 1912, the main valve for controlling the flow or the pressure fluid to the hydraulic lift for the car is controlled through the medium of an auX- iliary hydraulic lift, as distinguished from the rotary reversing motor shown and described in this application, While the term motor is used throughout the speciication and claims of this application in its more commonly accepted meaning, as a reversing rotary motor, but is not intended to be limited to such meaning Where the same or an equivalent system of conduits and valves could be used in combination With any other form of Water motor to carry out the same objects and accomplish the same results.

What I claim is:

l. In control mechanism for elevators, the combination of a main valve, a Water motor for operating said valve, separate supply pipes leading to the motor for driving it in `reverse directions and each provided With a normally closed valve adapted to be opened at will, and means actuated by said main valve when opened for cutting oli the supply of motive fluid to the opened valve and thereby stopping the motor.

2. In control mechanism for elevators, the combination of a main valve, a Water motor for operating said valve, a separate valve controlling the iovv of the operating luid to the motor, and additional means actuated by the main valve for cutting oli the uid supply to the second named valve When the main valve is opened.

3. In control mechanism vfor' elevators, the combination of a main valve, a Water motor, means including a clutch forl transmitting motion from kthe motor to the main valve, a normally closed valve operable at will and controlling the Huid passage to the motor', means actuated by such fluid When the second named valve is opened for operating said clutch.

4. In controlvmechanism for elevators, the combination of a main valve, a Water motor, means including a clutch for transmitting motion from the motor to the main valve, a normally closed valve operable at Will and controlling the fluid passage to the motor, means actuated by such fluid when the second named valve is opened for operating said clutch, and additional means actuated by the main valve for cutting oli the luid supply to the motor and thereby stopping further movement of the main valve.i y

5. Control mechanism for elevators comprising a main valve, a rotary Water motor having'separate inletsV for reversing its ydirection of rotation, separate valves for the inlets operable at will and means for transmitting motion from the motor to the main valve as said motor is rotated in either direction.

6. Control mechanism for elevators' comprising a main valve, a rotary Water motor having separate inlets for reversing its direction of rotation, separate valves for the inlets operable at will, means for transmitting motion from the motor to the main valve as said motor is rotated in either direction, and additional means actuated by the main valve when opened for cutting oil the fluid supply to said valves and thereby stopping the motor and main valve.

7. Control mechanism'for elevators comprising a main valve, a Water motor having separatesupply conduits leading to opposite sides of the motor for moving said motor in reverse directions, each conduit having a normally closed valve adapted to be openedk at `zvill, means including a clutch Afor transmitting motion from the motor to the main valve,- and additional means actuated by the fluid in either of said conduits when its corresponding valve is'opened for operating Said clutch. Y

8. Control mechanism for elevators comprising a main valve, a Water motor having separate supply conduits leading to op`posite sides of the motor for moving said motor in reverse directions, each conduit having a normally closed valve adapted to be opened at will, means for transmitting motion from the motor to' the main valve, and additional means'actuated by the main valve when opened for cutting oit' the huid supply to the motor and thereby limiting the opening movement of the main valve.l

Control mechanism for elevators comprising a main controller, a motor therefor having separate yfeed pipes and valves therein controlled by yan operator for driving the motor in reverse directions to reverse the action of the controller, and additional means actuated by a moving partei the main controller for cutting' 'oii the fluid supply to said valves to stop theA motor and thereby limit the action of said main controller in leither direction. y

10. A hydraulic-control mechanism for elevators c'omprisingA a main controlling valve, a Water motor therefor, separate fluid pressure pipes leading to opposite sides of the motor' for operating it in reverse direc'- tons, each pipe having connected therein a lltV Hcylinder, a water motor for operating the normally closed valve, means actuated by an operator for operating either of said closed valves independently of the other for operating the motor, a valve case connected to both of said pipes and provided with normally open connected valves, and means actuated by the main-controlling valve for operating the last named valves to cut off the supply offluid to the pipe corresponding to the opened valve therein for stopping the motor and thereby limiting the movement of said main-controlling valve.

11. A hydraulic-control mechanism for elevators comprising a main valve for controlling the passage of fluid to a power main valve, separate luid pressure conduits leading to opposite sides of the motor for driving said motor in reverse directions, each pipe having two motor-controlling valves, one of which is normally closed and the other normally open, operator-actuated means for opening either of the normally closed valves independently of the other, and separate means actuated by the main valve for closing the normally opened valve corresponding to the normally closed valve which has been opened for stopping the motor and thereby limiting the movement of the main valve.

l2. Control-mechanism for hydraulic elevators comprising a main valve, a water motor, means including a clutch for transmitting motion from the motor to the main valve, separate fluid supply pipes leading to opposite sides of the motor for driving said motor in reverse directions, normally closed motor-controlling valves in said pipes, means for opening either of said motor-controlling valves independently of 'the other, normally closed clutch-operating valves also connected in said pipes and each adapted to be opened by fluid pressure only when the corresponding normally closed valve is opened, and meansactuated by the opened clutch-operating valve for operating the clutch to cause the motor to operate the main valve.

13. Control-mechanism for hydraulic elevators comprising a main valve, a water main valve, and additional means actuated by the main valve for cutting off the fluid supply to the pipe corresponding to the motor-controlling valve which is opened for stopping the motor and thereby limiting the movement of the main valve.

14. Control-mechanism for hydraulic elevators comprising a main valve, a water motor, means including a clutch for transmitting motion from the motor to the main valve, separate fluid supply pipes leading to opposite sides of the motor Jfor driving said motor in reverse directions, normally closed motor-controlling valves in said pipes,

means for opening either of said motor-controlling valves independently of the other, normally closed clutch-operating valves also connected in said pipes and each adapted to be opened by fluid pressure only when the corresponding normally closed valve is opened, means actuated by the opened clutch-operating valve for operating the clutch to cause the motor to operate the main valve, additional normally opened valves controlling the passage of fluid to said pipes, and means actuated by the main valve for closing said additional normally opened valve corresponding to ythe normally closed motor-controlling valve which has been opened for stopping the motor and thereby limiting the movement of the main valve.

15. Elevator-controlling mechanism comprising a hydraulic lift, a normally closed main valve controlling said lift, a reversing motor and means actuated thereby for opening the valve, separate voluntarily operated valves for controlling the motor and means operated by the main valve for cutting oli the lluid supply to the opened one of said valves and stopping the motor after the valve has been opened a predetermined degree.

16. Controlling mechanism for hydraulic elevators comprising a main valve, a reversing motor and means actuated thereby for operating said valve, separate normally closed valves controlling the direction of movement of said motor, voluntarily operated means for opening either of said valves independently of the other, and additional means actuated by the main valve when opened for shutting off the fluid supply to 'the opened one of said valves.

17. Controlling mechanism for hydraulic elevators comprising a main controller having a normally closed piston valve, awater` motor, a supply pipe connected to the water vmotor andv having a normally open valve and a normally closed valve connected therein, voluntarily operated means for opening the normally closed valve to allow the water to flow to the motor `for operating the latter, mechanism actuated by the motor for operating the main valve and additional mechanism actuated by the main valve for closing the normally open valve and thereby shutting oil the supply of Water to the motor.

18. Elevator' controlling mechanism comprising a main valve and hydraulic motor, connections between the motor and main valve for operating said valve, said connections including a clutch, a fluid pressure supply pipe leading to the motor, a clutchcontrolling valve connected to the supply pipe and adapted to be operated by the pressure fluid flowing therethrough, mechanism actuated by said clutch-controlling valve for throwing the clutch into operative position and means for controlling the flow of the pressure fluid to the motor.

19. Controlling mechanism for elevators comprising a main controller, a hydraulic motor and mechanism actuated thereby for operating the main controller, said mechanism including a clutch, a pressure fluid supply pipe leading to the motor, and having a normally closed valve connected therein, voluntarily operated means for opening said normally closed valve and additional valve connected to the supply pipe and adapted to be operated by the pressure fluid and mechanism actuated by said additional valve for operating the clutch when the normally vclosed valve is opened.

20. Controlling mechanism for elevators comprising a main controller having a normally closed piston valve, a hydraulic motor and means including -a clutch for transmitting motion from the motor to said valvee a iluid pressure supply pipe leading to the motor and having a normally open valve and a normally closed valve connected therein, a clutch-controlling valve also connected to the supply pipe leading' to the motor, voluntarily operated means for opening the normally closed valve and supply pipe to admit the pressure fluid to the motor, the pressure of said fluid operating the clutch-controlling valve, means actuated by the clutchcontrolling valve for operating the clutch and additional means actuated by the piston valve of the main controller for closing the normally open valve in the supply pipe and thereby cutting ofi' the supplyof the pressure fluid to the motor.

2l. ln combination with the cylinder and piston of' a hydraulic elevator lift, a main valve controlling the inlet and'outlet of the pressure fluid to and from said cylinder, a Water motor, means including a clutch for transmitting motion from the motor to the valve, a motor controlling valve normally cutting off the passage of the pressure fluid to the motor, a manually operated controller, means actuated by said controller for opening said normally closed valve, and means actuated by the fluid passing through such opened valve for operating the clutch to cause said motor to operate the main valve.

22. ln combination with the cylinder of a hydraulic lift, a main controlling valve communicating with said cylinder, a Water motor and a clutch controlling the action of said valve, a separate Water motor for operating the clutch and controlling the passage of the motive fluid to the first named motor, and manually operated means .for controlling the passage of the motive fluid to the second named motor.

23. Controlling mechanism for elevators comprising a main valve, a hydraulic motor, a supply pipe for the pressure fluid leading to the motor and provided With a normally closed valve and a normally open valve, voluntarily operated means for opening the closed valve, means actuated by the motor for operating the main valve and additional means-actuated by the main valve when opened for closing the open valve.4

In Witness whereof l have hereunto setmy hand this '2nd day of December, 1912.

ADOLPH B. ROVER.

1Witnesses Venn H. MULTER, R. F. Binner..

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C.

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