Abstract: A lock pin for a VCT device that has a locked position, locking a housing assembly relative to a rotor assembly of the variable cam timing device, and an unlocked position. The lock pin has a body comprising a first diameter with a first area, a second diameter with a second area, and a chamber formed between the first area of the first diameter and the second area of the second diameter for receiving fluid, the first area being greater than the second area. When fluid is applied to the chamber through the variable cam timing phaser, a difference between first area and the second area defining the chamber creates a force imbalance, such that the oil pressure applied to the chamber of the body assists in maintaining the Sock pin in the locked position.

Abstract: The invention relates to an actuation device (1) for moving the movable cowling of a thrust reverser, comprising: an actuator (7) with a first member (12) such as a screw, and a second member (14) such as a nut, wherein the first and second members are capable of engaging such that the rotation of the first member results in a translation of the second member, a locking device (33) including a locking part (34) movable between a locked position for preventing to the rotation of the first member and an unlocked position for enabling the rotation of the first member, and a lock inhibiting device (42) comprising a recess (46) and a ball (47) movable in the recess between a stowed position, in which the ball enables the movement of the locking part, and an inhibition position in which the ball prevents the locking part from returning into the locked position.

Abstract: A method of controlling a thrust reverser made up of a plurality of pieces of equipment, wherein, in the event of it being detected that one of the pieces of equipment has not activated by the end of a predetermined activation period, an error message relating to the malfunction of the thrust reverser is generated, and in spite of the error message being generated, activation of the equipment is continued, and if the equipment is finally activated before a predetermined maximum period for deployment of the thrust reverser, then deployment of the thrust reverser is continued and the error message relating to the malfunction of the thrust reverser is withdrawn.

Abstract: A locking mechanism for locking an actuator piston within an actuator cylinder housing is disclosed. The locking mechanism comprises a locking pin that is moveable between extended and retracted positions. The locking pin can be moved using a controller, such as a hydraulic controller, for example. In the extended position the locking pin engages the actuator piston thereby locking the actuator piston in a specific position. The locking mechanism includes a mechanical bias (such as a spring or other mechanical system) that biases the locking pin towards an extended position to lock the actuator piston when counter-pressure on the locking pin is lower than the pressure provided by the mechanical bias. The locking pin can be hydraulically operated so that hydraulic pressure that forces the actuator piston to retract also exerts force on the locking pin to move it from a locked position to an unlocked position.

Abstract: A control system of a hydraulic type for a thrust reversal device with which a jet engine nacelle is equipped, and associated with a nozzle variation device, is provided by the present disclosure. The control system includes at least one additional control unit hydraulically connecting actuators together, wherein hydraulic supply lines from the control unit in a nozzle mode and from the control unit in a reverser mode are then able to communicate hydraulically with each other. A plurality of control valves are laid out so that when the unit for driving the actuators in a nozzle mode is active, a corresponding hydraulic signal controls the valves of the control unit in a position such that the hydraulic supply lines of the actuators from the driving unit according to a reverser mode are cut off.

Abstract: A system for selectively controlling movement of a piston between first and second positions, the system comprising a controller selectively actuated to enable fluid communication between a device and a source of pressurized fluid, a control valve for enabling fluid communication between a control system and the source of pressurized fluid, a sensing system for identifying the first and second positions, a monitoring valve selectively actuated by the at least one sensing valve for exhausting the flow of pressurized fluid, wherein the monitoring actuator remains actuated until the control valve is deactuated, and a latching mechanism selectively capable of engaging the piston when a loss of pressurized fluid has been identified.

Abstract: A lock mechanism of a cylinder includes a lock member for locking or unlocking a piston rod by actions of air pressure and a spring force, a third pressure chamber for causing air pressure to act on the lock member, and a third port. In a pneumatic circuit, a check valve and a throttle valve are connected in parallel in each of first and second pipes connecting first and second ports of the cylinder and a solenoid valve and a check valve and a throttle valve are connected in parallel in a third pipe connecting the third port and the first pipe or the second pipe.

Abstract: A double-acting hydraulic actuator with an axial locking device has a cylinder chamber defined by two coaxial cylindrical walls of different diameters interconnected by a frustoconical wall. A guide piston sliding in the smaller-diameter cylindrical wall is fixed to an end of an actuator rod. The actuator rod has an annular protuberance of diameter equal to the diameter of the cylindrical wall. An annular stepped piston providing sealing between the two cylinder chambers is slidably mounted in a middle portion of the actuator rod to slide between the piston and the annular protuberance. When the actuator is extended, a narrowed end of the annular piston bears against conical surfaces of two half-rings and urges them outwards. When the half-rings are pushed outwards and the narrowed end of the annular piston becomes interposed between them and the middle portion of the actuator rod.

Abstract: A first piston (22) of a first locking cylinder (20) descends when a pressure of compressed air in an actuation chamber (23) has exceeded a pressure for locking commencement (P1) and ascends by a first spring (24) when the pressure of the compressed air has decreased to a pressure for releasing commencement (P2). A second advancing and retreating cylinder (32) comprises an inlet chamber (41) and an outlet chamber (45) formed below and above a second piston (35), respectively, and a second spring (46). The actuation chamber (23) communicates with the outside air through the outlet chamber (45). A restricting passage (37) is provided in a route between the actuation chamber (23) and the outside air. The actuation chamber (23) communicates with one of the inlet chamber (41) and the outlet chamber (45) through a communication hole (62).

Abstract: A pneumatic or hydraulic cylinder (10) having a bore (12) cooperating with a piston (18). Extending from the piston (18) is a piston rod (37). There is further provided a pawl (26) which is engageable with the piston (18) to retain the piston (18) at a desired location. The pawl (26) is moved from engagement with the piston (18) upon fluid under pressure being delivered to one end of the cylinder (10).

Abstract: A locking device for a movement unit supported displaceably relative to and along a longitudinal axis of at least one guide rod, comprises a pair of clamping members which have each a clamping opening. Each clamping opening has an inner surface for receiving the guide rod. Each clamping member has a foot end and a head end and is pivotable about an axis to assume a first position, in which the inner surface is in frictional braking contact with the guide rod, and a second position for allowing free relative movement of the clamping members and the guide rod. The pair of clamping members has also a corresponding pair of control surfaces facing each other at their head ends. There is an actuation device that acts onto the pair of clamping members to move them from one of their positions to the other. This actuation device includes: a device for imparting movement which has a pressure exerting surface for exerting pressure in a direction towards the clamping members.

Abstract: A neutral brake system for use in a hydrostatic transmission to automatically apply a brake when the hydrostatic transmission is shifted to neutral. The neutral brake system includes a hydraulically-released, spring-activated brake mechanism in direct fluid communication with the main hydraulic passages which form a hydraulic circuit between the pump and the motor. When the hydrostatic transmission is shifted to neutral, a brake spring biases a brake lever into contact with a pair of friction pads to engage a brake disk splined to the output shaft of the motor to stop the vehicle. When the hydrostatic transmission is shifted out of neutral, a charge of hydraulic pressure within the hydraulic circuit causes a piston within a brake release chamber to override the biasing force of the brake spring, and to urge the brake lever out of contact with the friction pads such that the friction pads are disengaged from the brake disk, and the output shaft of the output shaft of the motor may freely rotate.

Abstract: A water well recharge throttle valve (1) is configured as a hydraulic actuated flow control device (5) that permits calibrated throttling of water used in Artificial Storage and Recovery (ASR), Salt Water Barrier, Dedicated Recharge and Injection Wells to prevent the free cascading of water and thereby eliminating the entrainment of air which may cause air fouling, bio-fouling, calcite formation with a resultant reduction in permeability of the aquifer.

Abstract: A hydraulic door opener provides a simplified mechanism for two-speed operation and for controlling the release of a brake that normally holds the door against movement. The mechanism includes a bypass valve between a fluid reservoir feeding the pump and the close control line running between the pump and the hydraulic motor. Fluid flow is directed from the close control line so that the door can be closed at slower rate than it is opened using a single speed motor. A brake control valve releases the brake when the control lines are pressurized.

Abstract: A pneumatic piston-cylinder unit has a cylinder (1) in which an air piston (4) with a tubular piston rod (5) is reciprocably actuated by compressed air from two main air channels (18, 19). The air cylinder (1) includes an integrated hydraulic control system (6) having an actuation device (8) which is fixedly mounted in the air cylinder (1) for creating a flow of hydraulic fluid through hydraulic control system (6) when compressed air is present in the main air channels (18, 19) and for stopping the flow of hydraulic fluid and thereby preventing the air piston from moving when there is no compressed air in the main channels (18, 19). A piston (34) and a cylinder (28) of the hydraulic control system (6) are displaceable an adjustably long distance in relation to each other to make it possible to open and close, respectively, a larger or smaller hydraulic fluid passageway thereby controlling the moving speed of the air piston (4) while maintaining the air pressure.

Abstract: The present invention provides an actuator controlled by an electro-hydraulic servovalve with a failfixed operation upon the loss of electrical power to the servovalve. A lock valve has apertures therethrough with friction pads therein for locking the actuator in position upon loss of the electrical power.

Abstract: The invention relates to a safety arrangement on hydraulic piston-cylinder units. In particular for monitoring locking cylinders, e.g., of operating tools mounted on a grab bucket boom. A sensor for monitoring the piston position is provided on the piston-cylinder unit and is coupled electrically to a monitoring circuit for triggering an alarm arrangement if the piston is incorrectly positioned. The sensor (3) is coupled to an electrically actuatable locking valve (2) coupled in the monitoring circuit (9) for controlling the hydraulic piston-cylinder unit (1).

Abstract: A forward-moving inching unit and a backward-moving inching unit are built in a casing (1) which is slidable relative to a guide member (b).

Abstract: Compressed air is introduced into a cylinder chamber to displace a piston closely to a target position. Then, a ball screw shaft is rotated about its own axis by an electric motor to inch the piston to the target position. Upon arrival of the piston at the target position, the ball screw shaft is stopped by a brake mechanism to hold the piston accurately in the target position. The drive shaft of the electric motor extends parallel to the ball screw shaft, thus reducing the entire length of a servo cylinder apparatus. Solenoid-operated directional control valves, for supplying compressed air to the cylinder chamber and the brake mechanism are coupled integrally to a cylinder assembly, so that pipes are shortened for allowing the piston to be displaced and stopped quickly and accurately.

Abstract: An auxiliary mechanical position locking device is coupled to the hydraulic system that motivates a double acting piston for positional control of surgical tables. The combination of hydraulic coupling and mechanical locking maintains positional stability of the surgical table and insures against sudden or precipitous movements.

Abstract: Disclosed is a a time delay valve, which has a reduced number of components so that the manufacture thereof is easy and the number of manufacturing processes is reduced, and by which the delay time thereof is easily reset and changed. The time delay valve is disposed incorporated in a casted-housing of the hydraulic motor to be prevented from being damaged. The time delay valve has a spool movably disposed therein in such a manner to be elastically supported by a spring and be moved by a signal pressure applied to a signal pressure port, and an orifice spool movably disposed therein with being elastically supported by another spring. The constant pressure port and the pressure receiving chamber is interconnected with each other through an oil flowing path in the course of an alternating stroke of the spool. The orifice spool is moved by the elastic force of the spring and the pressure difference between a spring chamber of the orifice spool and an oil flowing path.

Abstract: A pressure-discharged type retaining system is designed so that supplying and discharging of a high-pressure fluid permits the relative movement of an annular outer member and an inner member inserted and fitted therein in either or both of axial and circumferential directions and retains the outer and inner members stationary. In the prior art, to insure the smoothness and safety of the operation, a high processing accuracy, a measuring accuracy and the like have been required in the production of such a system, resulting in an increased cost. According to the present invention, either one of the adjacent inner and outer members is formed, on its outer or inner surface, with a metal layer which has a predetermined difference in hardness from that of the other member, thereby solving the above subject.

Abstract: An actuator for a thrust reverser is disclosed which will prevent retraction of the thrust reverser door from its open, reverse thrust position should there be a malfunction in the locking system which locks the thrust reverser door in its closed forward thrust position. Upon deployment of the thrust reverser during a normal aircraft landing, should there be a malfunction in the thrust reverser door locking system, the actuator holds the thrust reverser doors in their opened positions so as to provide a positive, visual indication of such a system malfunction. The actuator has an internal device in the actuator head which, in cooperation with the control rod of the secondary mechanical locking system prevents hydraulic fluid from retracting the actuating piston and rod assembly from their extended positions and thereby prevents retraction of the thrust reverser door from the reverse thrust positions.

Abstract: A linear drive is disclosed comprising a single-acting pneumatic piston cylinder unit, at least one spring which acts against the pneumatic force and loads the piston rod in the direction of one end position, and one form-locking pneumatic locking mechanism respectively for each of the two end positions of the piston rod.

Abstract: An axially reciprocable working piston has opposed working surfaces facing opposed working chambers which are intermittently connected to respective cavities pressurized with compressed air. The working piston is connected to opposed seating pistons which cut off the connection between the cavity and working chamber behind the advancing piston and establish the connection in front of the piston, thereby conserving compressed air and storing potential energy for return movement of the piston. In either of two stable positions the working piston is hydraulically latched by fluid admitted to a respective chamber from another chamber through a two-way check valve. The check valve is electronically switched on commend to reverse the flow direction of the hydraulic fluid, thereby initiating movement between opposed stable positions.

Abstract: A drive system for a lid or a flap of a convertible car body in which the control effort for the drive system is reduced by configuring the working cylinder as a control valve which releases the lid or the like after unlocking of the lock for lifting by the lifting cylinder, and is connected between the control device and the lifting cylinder.

Abstract: In a position independent locking of a hydraulic cylinder/piston mechanism, a pressure limiting member is provided in the supply pipe for the hydraulic medium, with the pressure limiting member being open during the hydraulic displacement of the piston and is closed during lack of hydraulic pressure. The pressure limiting member opens starting from a specific pressurization of the hydraulic medium as a result of a force generated by means of the piston and is located in a related working chamber.

Abstract: An actuator for raising and lowering aircraft landing gear in accordance with the extended and retracted state of the actuator includes a cylindrical casing, a piston assembly slidable along the axis of the casing, a fluid pressure source, a sealed chamber containing gas, a free piston forced by fluid pressure along the casing axis to compress the gas, latching devices for locking the piston assembly to the casing, a locking mechanism for holding the free piston in position on the pressure tube when the gas is compressed and hydraulic passages interconnecting the chamber containing pressurized gas and the space containing pressurized hydraulic fluid. A mechanism is provided for initiating automatic retraction of the actuator due to the effect of a self-contained perpetual source of compressed gas if hydraulic pressure is lost. A compression spring stores a force while the piston assembly moves between retracted and extended positions.

Abstract: A control valve is opened (moved from its neutral position) by rotation of a steering wheel to conduct fluid from a pump to a steering meter device that controls the amount of fluid fed to a steering motor arrangement. When the steering motor piston has been displaced by a distance corresponding to the angle of rotation of the steering wheel, the control valve is moved by the steering meter device from its opened condition to its neutral position. A pilot valve controlled actuating device is provided to short circuit the steering meter device to permit continued fluid flow from the pump to the steering motor device and provide a mechanical braking force to the meter device to block rotation thereof and thereby the movement of the control valve to its neutral position. The braking mechanism is resiliently urged to a non-braking position.

Abstract: A hydraulic lock cylinder in which a cross bore is provided in an end structure of the cylinder housing which intersects the hydraulic fluid inlet passage to the central bore of the cylinder; a control piston is reciprocally mounted in the control bore; and pressurized fluid is admitted to the opposite ends of the control bore to shuttle the control piston within the control bore between a closed position in which the inlet passage is blocked and an open position in which the passage is open. The control piston includes a flat surface and a control port opening in the flat surface and an annular fitting screws into the inlet passage housing and includes a seal on its lower end for sealing coaction with the flat surface on the control piston to seal the inlet passsage.

Abstract: The present invention provides a pneumatically powered actuator having hydraulic control for both locking and controlling the velocity of an output rod without any sponginess. The invention includes a double-acting pneumatic actuator having a bore, a piston slidably engaged within the bore, and a control rod connected to the piston. The double-acting pneumatic actuator is mounted to a frame. A first double-acting hydraulic actuator having a bore, a piston slidably engaged within the bore, and a follower rod mounted to the piston is mounted to the frame such that the follower rod is fixedly connected to the control rod. The maximum translation of the piston within the bore of the first double-acting hydraulic actuator provides a volumetric displacement V.sub.1. The present invention also includes a second double-acting hydraulic actuator having a bore, a piston slidably engaged within the bore, and an output rod mounted to the piston.

Abstract: A piston sealing arrangement for pressure-fluid-operated systems is disposed in an annular recess of a piston (5) or an associated housing (4) and is composed of a sealing ring element (1A, 1B) as well as an elastic element (2, 3) acting on one side in opposition to the direction of the pressure force (A). Herein the elastic element is dimensioned such that the sealing ring element (1) moves against its elastic element (2, 3) at a pressure smaller than the force against which the piston (6) is moving and by which it is kept on its stop, a pressure-fluid film being formed as a result which safeguards a uniform initial movement of the piston to a largest possible degree.

Abstract: An actuation member (B) supported by a housing (A) is actuated for clamping upwardly by means of a spring force and actuated downwardly for unclamping by means of an actuation means (D). A piston (11) is inserted into a cylinder (10) fixedly secured to the upper portion of the housing (A), and a liquid sealing chamber (12) is formed below the piston (11). The piston (11) is fixedly secured to the actuation member (B). When the actuation member (B) is held in the clamped condition, a liquid sealing valve (15) is closed so as to seal an oil (L) within the liquid sealing chamber (12). Whereby, in case that a pulling down force larger than the clamping spring force is imposed to the actuation member (B), a pressure generated within the liquid sealing chamber (12) serves to prevent the piston (11) from lowering, against the pulling down force.

Abstract: An actuator including a cylinder having a longitudinal bore, a piston slidably and sealingly inserted into the cylinder, and a lock mechanism for temporarily locking the piston, the cylinder including a cylinder body having the longitudinal bore, a cylinder formed at a front end of the cylinder body and accommodating the lock mechanism, and a front wall connected to the cylinder head at a position opposite to the front end of the cylinder body and having a hole formed therein, the piston including a piston head slidably and sealingly inserted into the cylinder bore, the piston rod projecting from the piston head and slidably insertable into the hole of the front wall, a key groove formed on the piston rod at a position near the piston head, and a longitudinal hole formed within the piston head and the piston rod, wherein the diameter of the piston rod decreases from a backward position adjacent to the key groove to a forward position spaced from the piston head.

Abstract: A hydraulic actuator comprising a cylinder formed with an axial cylinder chamber, a main piston provided in the cylinder chamber and dividing the chamber into a first chamber and a second chamber and further formed with a locking chamber, an annular locking groove formed in the cylinder, a locking member cooperating with the annular locking groove to lock the main piston in a predetermined position, the locking member movable between an unlocking position and a locking position, a locking-unlocking piston for moving the locking member into the locking and unlocking positions, and a pressure introducing passageway for selecting the first or second chamber that is higher in pressure and introducing the higher pressure in the selected chamber into the locking chamber of the main piston. The locking-unlocking piston is moved by the pressure introduced by the pressure introducing passageway to move the locking member into the locking and unlocking positions.

Abstract: The cylinder has a sealed back wall through which the rod passes. A piston assembly mounted on the rod between the back wall and a cylinder front end-piece contains a fluid-pressure-activated clamp. The front end-piece also has a clamp. By sequenced operation alternatively fixing the piston or the cylinder to the rod through the respective clamp, the relative travel of cylinder and rod can be extended to any desired length.

Abstract: Power cylinder comprising a housing having a throughbore capped by end plates defining therein a longitudinally extending chamber. A piston including a longitudinally extending body portion mounts for reciprocal movement in and in bearing relation to the portion of the wall surface which bounds the length of said chamber. The piston has a longitudinally extended through passage and brake means immediately of its outer peripheral surface. A valve device associated with the piston body includes a portion thereof in communication with the through passage. The housing has ports respectively communicating with respective end portions of the chamber for selective delivery thereto and discharge therefrom of fluid under pressure and the selective application of such fluid under pressure to one or both ends of the piston.

Abstract: A pneumatically movable device with a safety lock means having a movable member, a pneumatic actuator connected to the movable member and adapted to move the movable member and a direction control valve connected to the actuator. A cylinder for locking is connected between one of the ports of the cylinder and the direction control valve. A spring is disposed in the cylinder for locking. Openings provided at a chamber at a side of the spring are connected to the actuator and the directional control valve respectively through a check valve disposed for preventing the air from flowing into the cylinder for locking. Openings provided at a chamber at a side remote from the spring are connected to on one hand to the actuator through a check valve disposed for preventing the air from flowing into the cylinder for locking and on the other hand to the directional valve through the check valve with a restrictor disposed for preventing the air from flowing into the direction control valve.

Abstract: A hydraulic operating apparatus in which a differential piston is used as a drive unit, and in which the differential piston is driven by applying a high pressure fluid on a large piston face side through a hydraulic pressure control device for controlling the hydraulic pressure, and a high pressure fluid always being applied on the small piston face side. The hydraulic operating apparatus is constructed such that a high pressure fluid is applied concurrently on both piston faces when the differential piston stops at its receded position, and a thrust generated due to the difference between the forces applied on the both piston faces is held in check by a holding device acting on the differential piston or its extension. The differential piston is moved forward upon the removal of the holding force of the holding device, and the piston is moved backward upon the removal of the high pressure fluid on the large piston face side.

Abstract: A locking apparatus for fluid operated valves having a piston connected to the valve actuator which moves in response to applied pressure within a cylinder housing having a cylinder head, a catch block is secured to the piston, and the cylinder head incorporates a catch pin. Pressure applied to the cylinder to open the valve moves the piston adjacent to the cylinder head where the catch pin automatically engages the catch block preventing futher movement of the piston or premature closure of the valve. Application of pressure to the cylinder to close the valve, retracts the catch pin, allowing the valve to close. Included are one or more selector valves, for selecting pressure application to other apparatus depending on the gate valve position, open or closed, protecting such apparatus from damage due to premature closing caused by pressure loss or operational error.

Abstract: The apparatus comprise a generally tubular outer element, a generally cylindrical inner element disposed therewithin and sized relative thereto to provide a generally annular operating space therebetween. An intermediate element is disposed in said operating space and is dimensioned relative thereto to create interference fits with said outer and inner elements and prevent relative movement therebetween. Means are provided to introduce pressurized fluid to the respective element interfaces to expand the outer element within the elastic limit thereof to an extent sufficient to release the interference fits and enable relative outer-inner element movement. Re-locking of the outer and inner elements occurs automatically upon depressurization of the fluid and attendant return of the outer element to its unexpanded configuration. Actuating means to effect relative outer and inner element movement upon apparatus unlocking are also provided, and include means to pressurize the fluid.

Abstract: The present invention relates to a fluid-operated actuator, constituted by a cylinder and by a double-effect piston, provided with a device suitable to automatically locking the same piston at the end of its working stroke.

Abstract: A new and improved indexing table for supporting a workpiece on a machine tool and the like includes a base with a workpiece supporting table carried on a support shaft journaled for rotation to index the workpiece for machine tool operations. A drive system is provided for rotating the table in one direction about a longitudinal axis of the support shaft and an indexing wheel is provided on the shaft having a plurality of index slots spaced angularly around the periphery for securing the table in selected indexing positions. A shot pin is provided for engaging selected slots in the wheel to lock the table in a fixed position and when the shot pin is retracted, the table is then permitted to rotate toward a next indexing position.

Abstract: The servomotor arrangement has a moving system comprising a piston movable in a cylinder. A latching or retaining member movable transversely of the direction of movement of the system is provided to retain or latch the moving system. The latching member is in operative connection with a pressure chamber, and the pressure chamber is in communication by way of a stop member with a pressure medium source and with a pressure medium sink. The latching member is controllable, a feature which has advantages for the operating behavior of the servomotor arrangement.

Abstract: A fail-safe system for use on a hydraulic piloted pressure reducing and regulating valve for holding the valve at the last selected operating pressure in the event of loss of control signals. A pressure regulating valve having a body and a control piston therein is provided with a pilot piston in the body which is adapted to be connected to and responsive to a hydraulic signal pilot pressure. A segmented locking ring surrounds the assembly and coacting concentric V-shaped locking grooves are provided between the locking ring and the assembly for locking the assembly. The segmented ring is biased towards an unlocked position. An annular cam ring engages the exterior of the locking ring. Coacting wedge surfaces between the cam ring and the locking ring are provided for locking and releasing the locking ring. The cam ring is biased for urging the coacting wedge surfaces into engagement.

Abstract: The invention relates to a fluid power actuator with a cylinder, a piston and a piston rod whose motion is controlled by a positioning device which halts it in selected settings. The positioning device has a row of depressions, for example gaps between the teeth of a rack, running parallel to the piston rod. A positioning plunger moves into a selected depression to lock the rod. A shutter with at least one opening therein covers the row of depressions and is adjustably affixed thereto so as to allow adjustment of the position at which the control plunger aligns with the shutter opening and slips into the selected uncovered depression to stop and lock the piston and rod.

Abstract: A method and arrangement for reciprocating a piston in a cylinder of a fluid actuated actuator between one and another alternate positions, and using the piston fluid actuator fluid to move a lock member from a first position to a second position to lock the cylinder when it is moved from one position to its other alternate position. Actuator fluid is communicated to unlock the lock member and to move the piston back to its one position. In another form, the lock member is moved to its first position by the actuator pressure fluid which actuates a valve to communicate actuator fluid pressure from the lock member to the cylinder to move the piston back to its said other position.

Abstract: A non-public hydraulic elevator has three emergency systems isolated from the primary drive system: a control system, a manually activated emergency descent system, and an emergency stop system. A hydraulic brake is provided a primary and emergency brake release pressure supply by the control and manually activated emergency descent systems, respectively. The emergency stop system overrides the control system and the emergency descent system to positionally lock the elevator car. A hydraulic safety-governor system operates during descent to monitor and maintain a controlled descent speed.

Abstract: A fluid-pressure-operated, double-acting working cylinder which dampens the final braking of the work piston, includes a cylinder housing with a movable work piston disposed therein, the work piston dividing the cylinder into two work chambers. A piston rod, on which the work piston is mounted, extends through the housing. At least one auxiliary braking member is disposed on at least one side of the work piston in an offset slidable relation to the work piston. A braking arrangement disposed on the auxiliary braking member is controlled by fluid pressure to brake the auxiliary braking member to a desired position within the cylinder. A dampening chamber, a dampening spring configuration is disposed between the auxiliary braking member work piston such that, following braking of the auxiliary braking member, continued movement of the work piston is effectively dampened.

Abstract: A hoseless arrangement for supplying pressure and tank passages in remote hydraulic device including an extend tube, with pressure and tank passages, and an extend cylinder each reciprocably mounted on a base with a pair of concentric tubes attached to the extend cylinder and to the extend tube, the inner tube communicating with one side of the extend cylinder and the outer tube with the other side thereof. A shuttle valve on the extend tube is connected to shift so that the pressure passage is always subjected to high pressure and the tank passage is always subjected to low pressure.