Abstract: Disclosed is driving unit (1) for a brake (100) comprising: a driving device (2); a hydraulic pump (3) driven by said driving device (2); a hydraulic cylinder (5) in fluid communicating with the hydraulic pump (3) and driven by said hydraulic pump (3). The hydraulic pump (5) is operably connected with one piston rod (7) to drive the piston rod (5) to reciprocate, said piston rod (5) is drivingly connected with a braking portion (8) of the brake (100). The driving unit (1) is further provided with a holding device (10) for keeping the braking portion (8) under an operation state. The present invention further discloses a brake (100) having such driving unit (1).

Abstract: There is provided an actuation system for a gas turbine engine including a thrust reverser and a variable area fan nozzle. The system has a plurality of linear actuators each having a first outer piston concentric with a second inner piston. The first outer piston is operatively connected to a thrust reverser. The second inner piston is operatively connected to a variable area fan nozzle. The system further has a piston lock assembly for selectively locking the first outer piston to the second inner piston. The system further has a control system coupled to the plurality of linear actuators for operating the variable area fan nozzle between a stowed position and a deployed position.

Abstract: A lock mechanism is provided in a head cover of a cylinder tube. The lock mechanism comprises a holder, which is installed in the head cover, a plurality of balls that are retained displaceably in a radial direction with respect to the holder, and a displacement member that displaces the balls under a resilient action of an elastic member. The balls engage with a ball groove of a lock pin. The balls are retained by a resilient force of the elastic member, in order to restrict displacement of the lock pin.

Abstract: The present empty/load device includes an inlet to receive a brake signal, an outlet for a brake device, load sensing element, a change over valve responsive to the load sensing element to proportion the pressure at the inlet and the outlet when empty is sensed by the load sensing element, a differential pressure element connecting the load sensing element and the change over valve, and a lock-out mechanism to prevent proportioning of the inlet pressure to the outlet when activated. The lock-out mechanism includes a lock-out valve, in a lock-out position, pneumatically preventing proportioning of the inlet pressure to the outlet. A first spring biases the lock-out valve from the lock-out position. A detent engages the lock-out valve and holding the lock-out valve in the lock-out position. The lock-out valve may be connected in parallel to the change over valve with respect to the inlet and the outlet.

Abstract: A displacement amount-adjusting mechanism for adjusting the displacement amount of a slide table includes a stopper which faces a cutout formed at a bottom surface of the slide table and which is fixed to an upper surface of a main cylinder body, a first adjuster bolt which is provided movably back and forth on the slide table and which is screwed into a screw hole communicating with the cutout, an adjuster plate which is fixed to an end surface of the main cylinder body, and a second adjuster bolt which is screwed into a hole of the adjuster plate.

Abstract: A cylinder block brake for a hydrostatic transmission or transaxle is provided. A braking member is located in a housing adjacent to a motor cylinder block and has a first position where it is not engaged to the motor cylinder block and a second, braking position where it is engaged to the motor cylinder block. A brake actuation shaft is located in the housing and has a cam portion located along its longitudinal axis. The cam portion is positioned to engage the braking member so that rotation of the brake actuation shaft moves the braking member between the engaged and disengaged positions.

Abstract: A cylinder locking device for use in a clamp. The cylinder locking device includes a cylinder member and a first end cap on one end thereof and a second end cap on another end thereof. A piston is arranged within the cylinder member and a piston rod is engaged with the piston. The piston rod is capable of movement with respect to the piston. The cylinder rod lock device also includes a plunger contacting the second end cap. A spacer contacting the second end cap is also included in the locking device. The locking device also includes at least one locking arm contacting the spacer. The locking device also includes a mounting plate contacting the locking arm and a fastener on an opposite side thereof. The cylinder locking device will be capable of locking the cylinder in a fully retracted position and a fully engaged position.

Abstract: A handling equipment of the swingable arm type comprises a double acting cylinder within whose chamber a main piston is sealingly mounted, which is slidable owing to the selective delivery of fluid under pressure at opposite zones of the chamber, which is connected to a rod associated to the arm with a toggle joint. The equipment comprises a device for controlling the oscillation of the arm, including: a cavity of the rod having a nut screw, a screw member with a threaded shank in engagement with the nut screw, a rotatable head opposite to the rod and not slidably mounted with respect to the cylinder, and means for controlling the rotation of the screw member, associated with its head in order to brake the rotation of the screw member following to an anomalous condition in the feeding of fluid under pressure to the chamber of the cylinder.

Abstract: A cylinder locking device for use in a clamp. The cylinder locking device includes a cylinder member and a first end cap on one end thereof and a second end cap on another end thereof. A piston is arranged within the cylinder member and a piston rod is engaged with the piston. The piston rod is capable of movement with respect to the piston. The cylinder rod lock device also includes a plunger contacting the second end cap. A spacer contacting the second end cap is also included in the locking device. The locking device also includes at least one locking arm contacting the spacer. The locking device also includes a mounting plate contacting the locking arm and a fastener on an opposite side thereof. The cylinder locking device will be capable of locking the cylinder in a fully retracted position and a fully engaged position.

Abstract: A braking system (S) for braking a rotor (5, 9, 106) relative to a stator (1C, 1′C), said system comprising two series of brake disks (102, 104) secured respectively to the stator and to the rotor and disposed in a disk enclosure (100). The system further comprises a brake piston device (108, 114, 116) urged continuously in the braking direction by resilient return means (118). The piston device is urged in the brake release direction by feeding a brake release chamber (120) with fluid, and it is urged in the braking direction by feeding a braking chamber (124) with fluid. The braking system includes a cooling device for cooling the brake disks (102, 104) by means of fluid flow, which device is provided with a cooling duct (140) branching from the brake release duct (122) which feeds the brake release chamber (120) and communicating with the disk enclosure (100). It is provided with means (148) for limiting the quantity of cooling fluid tapped by the cooling duct (140) from the brake release duct (122).

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 hydrostatic transmission including a fluid pump and fluid motor mounted within a transmission housing, and a brake connected to the motor shaft. The housing includes upper and lower sections. The brake includes rotor and stator plates, and a pin for urging the rotor and stator plates into frictional engagement. The upper and lower sections are joined along a split line and each has a mating half-round section, for positioning the pin.

Abstract: The invention relates to a lockable telescopic device (1) which includes a cylindrical tube (10) and a piston rod (3). The piston rod (3) includes an expandable locking device (60) which, when active, forcibly abuts a part of the inner wall of the tube (10). The expandable locking device (60) includes two sleeves (61, 62) which accompany movement of the piston rod (3) in the longitudinal direction of the device (1). The piston rod (3) and the tube (10) are locked against relative movement by rotating the sleeves (61, 62) relative to one another with the aid of a lever (51) mounted on the piston rod. The invention also relates to the use of the lockable telescopic device in conjunction with so-called engine shelves.

Abstract: A linear actuator, adapted especially for picking up and transporting workpieces, comprises a pneumatic, rodless cylinder having a pair of driven elements mounted on opposite sides of its body. The first driven element is directly connected to the piston of the cylinder via a sealed, longitudinal slot formed in the cylinder body and the second driven element is drivably connected to the piston or first driven element by a flexible drive band that passes around rollers mounted at opposite ends of the cylinder body. The driven elements therefore move linearly in opposite directions to one other upon actuation of the rodless cylinder. The second driven element may be fixedly secured to a stationary structure so that, upon actuation of the cylinder, the cylinder body itself and the first element will simultaneously execute linear motion in the same direction whereby the first element, which may have a work piece--gripping device mounted on it, will in effect execute double its normal stroke length.

Abstract: A lock-out assembly having a latching mechanism by which means a plunger may be manually depressed and latched in a lock-out position in which a lock pin is pre-set by engagement with an actuator rod of an empty/load valve or the like, so that in response to axial extension of the actuator rod sufficient to align a locking groove in the actuator rod with the lock pin, locking engagement therebetween will occur to limit further axial extension of the actuator rod, without any further action on the part of the operator. Automatic disengagement of the lock pin from the locking groove of the actuator rod occurs in response to axial retraction of the actuator rod, by effecting disengagement of the latching mechanism to allow a return spring to reset the plunger.

Abstract: A power cylinder of the type in which the piston may be locked to maintain am associated tool or clamp in a fixed position. A nut is provided in an end wall of the cylinder and the piston rod of the piston passes through the nut. The initial portion of the forward stroke of the piston is accomplished by the introduction of fluid pressure into the cylinder and, as the piston approaches the final portion of its stroke, the threaded portion of the piston rod engages the nut whereupon the nut is rotated to threadably advance the piston through the final portion of its stroke. The rotation of the nut is accomplished by pressurized fluid acting against a piston rack which rotates a gear which in turn rotates the nut. The center line of the piston rod is offset from the center line of the piston to preclude rotation of the piston and of the piston rod.

Abstract: A locking mechanism for an actuator prevents the unauthorized operation of the actuator and also permits a viewer to determine whether the actuator is in a locked open, locked closed or unlocked position. The invention utilizes a clear cover guard which is positioned and locked on an actuator body which is attached to a housing. The actuator body comprises threaded bores which permit a bolt to be inserted into the actuator body until it contacts an integral locking cam and driver arm rotatably disposed within the actuator body. The bolt contacts the locking cam in order to selectively lock the integral locking cam and driver arm in a desired position.

Abstract: A power cylinder assembly including means to positively lock the piston rod of the assembly in the forward extended position of the cylinder assembly. The locking means includes a pair of cam plates that are moved radially outwardly into locking engagement with lock slots defined by inserts positioned in the wall of the cylinder with the radially outward movement of the locking plates being generated by a lost motion connection between the piston and the piston rod in the form of a pin and slot connection. The pin is carried by the piston rod and coacts with cam slots in the cam plates to move the cam plates radially outwardly at the end of the forward stroking movement of the piston assembly so that the final forward movement of the piston generates the radially outward movement of the lock plates.

Abstract: A power cylinder of the type in which the piston may be locked to maintain the associated tool or clamp in a fixed position. A pair of guide rods extend in parallel spaced fashion through the bore of the cylinder from end to end of the cylinder and the piston includes a pair of spaced apertures passing the guide rods so that the piston may slide within the bore of the cylinder on the guide rods. The piston apertures are internally threaded and the guide rods include an externally threaded portion so that, following movement of the piston within the bore through a rapid advance portion of its stroke under the influence of pressure fluid, the internal threads in the piston apertures are brought into engagement with the externally threaded portions of the guide rods and the guide rods are thereafter rotated so as to threadably advance the piston to its final desired position in which the piston is lockingly held by the coacting threads.

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: An axial piston motor is provided having a mechanical friction brake incorporated in the driving flange, thereby maintaining the axial length of the motor the same as motors without a mechanical friction brake.

Abstract: A brake cylinder comprises a brake actuator device having a fluid operable piston and a coaxial adjoining hand brake operable device for axial actuation of a coaxial tubular push rod, there being a slack adjuster for selectively adjusting the retraction of the push rod. An actuating rod is connected to the piston and the actuating rod is selectively connected and disconnected from the internal periphery of the push rod by locking rollers selectively cooperating with a wedge shaped annulus disposed between the actuator rod and the inner periphery of the push rod. Slack adjustment is permitted by axial travel of the push rod beyond free travel limits as permitted by a friction sleeve connection between the outer periphery of the push rod and the brake cylinder housing. In a modification, the locking device is provided for a fluid spread brake cylinder that is adapted by levers to be connected to a conventional freight brake rigging to be used, for example, for hand brake applications.

Abstract: The jack of the present invention is novel in having a stem extending from a body which is spring pressed from a base to engage an element which thereafter is locked in position to prevent the element from deflecting under load. A pair of studs and nuts are provided within the body between the base and stem which when actuated locks the stem in extending position and prevents the deflection of the element. The application of fluid to a piston within the body releases the stem so that the jack can be removed at the end of the operation on the element. The jack prevents a portion of the element which is not rigidly supported to be retained in fixed position against deflection when being operated on.

Abstract: A locking mechanism for hydraulically actuated devices is disclosed herein. The mechanism includes a slotted lock shaft coaxially mounted with respect to a piston assembly, the piston assembly being disposed in a hydraulic cylinder. The lock shaft has end faces or shoulders which engage a portion of a shaft associated with the piston assembly to lock the piston assembly and the ram shaft in a predetermined position. The lock shaft has a configured surface which cooperates with a configured surface of the piston assembly for unlocking the mechanism. The locking mechanism is described for use with a ram type blowout preventer but can be used with various types of hydraulically actuated devices.

Abstract: This device comprises two movable elements of rigid material tightly interconnected by means of a deformable membrane forming therewith a tight internal enclosure, means for varying abruptly the volume of said enclosure by successively moving the two elements away from each other, maintaining them in spaced relationship and allowing them to be urged toward each other by the effect of the external hydrostatic pressure, in which the means for moving the two elements away from each other includes two cylinders and at least one piston slidable in one of said cylinders, associated to one of said movable elements and also to a push-member slidable in one of the cylinders and bearing on the other movable element and means for feeding said cylinder with pressurized fluid so as to maintain the elements in spaced relationship or to release them.

Abstract: A vehicle braking means is disclosed in which an auxiliary chamber 2 comprises a locking mechanism whose function is to lock together a piston 5 and a piston rod 16. The locking mechanism comprises a spring-loaded guide 19 and locking elements 20 arranged to constantly contact the guide 19 and to engage the piston 5. To release the vehicle brakes, provision is made of a rod 21 or a pushrod 43 extending from the auxiliary chamber 2. As compared with the constructions known currently, the auxiliary chamber 2 is more readily operable and convenient in use.

Abstract: An air brake includes a service brake chamber which actuates a push rod. A collet brake chamber is partially defined by a collet brake diaphragm. A locking collet is mounted to the collet brake diaphragm and includes a bore through which the push rod passes. A collet brake spring biasas the collet into a tapered collet hole to clamp the collet onto the push rod to prevent the movement of the push rod toward the brake off position. Application of pressure to the collet brake chamber overcomes the force of the collet brake spring and moves the collet away from the tapered collet hole to allow the push rod to move freely. The collet can be moved towards and locked against the collet brake spring to prevent the collet from engaging the push rod. This allows the user to effectively deactuate the collet brake feature when desired, such as to mechanically release the push rod from the collet when the vehicle is stationary.