A locking actuator with a collision detection system for a lift is arranged to detect misalignment relative to a locking receptacle and to stop activation of the locking actuator when misalignment is detected.

The present disclosure provides a pneumatically drivable actuator for setting a position of a valve closure element in a valve, comprising a piston, which is moveable in a pressure chamber by influence of a drive gas, and a locking mechanism for mechanically locking the piston relative to the pressure chamber. The actuator further comprises a ventilation device for venting the drive gas from the pressure chamber while the piston is mechanically locked relative to the pressure chamber, such that pressurization of the pressure chamber is prevented. A method of locking a valve closure element relative to a valve body of a valve that is controllable by a pneumatically driven actuator is also disclosed.

A two-stage, fully self-retracting, telescopic fluid actuator suitable for high speed ejection applications comprises a detent 38, 64, 26, which locks a cylinder 6 in an extended position for extension of a piston 3 therefrom. The detent is released by retraction of the piston into the cylinder again, e.g. unspring bias, so that the actuator is fully self-retracting. A locking ball 38 of the detent also serves to latch the piston and cylinder to each other for the first stage of the actuator extension. In an alternative embodiment, cam means (80, 117 FIGS. 10, 11 and 13) and plungers (90, FIGS. 10, 12, 13 and 15) perform the detent and latching functions.

A ram air turbine actuator release device to release a ram air turbine actuator includes a lock bolt releasably engaged to the ram air turbine actuator, a toggle comprising a toggle roller to engage the lock bolt, and a toggle pivot to couple the toggle to the ram air turbine actuator, a hydraulic toggle actuator, including a piston defining a first hydraulic chamber and a second hydraulic chamber, a solenoid valve in fluid communication with the first hydraulic chamber, and a plunger coupled to the piston, wherein a pressure differential between the first hydraulic chamber and the second hydraulic chamber displaces the plunger to rotate the toggle to disengage the toggle roller from the lock bolt.

Provided is a hybrid servo actuator for a crash test, and more particularly, a hybrid servo actuator for a crash test in which an operating part including a piston and a rod, a chamber supplying an air pressure to the operating part, and a controller controlling a movement of the operating part are integrally formed, thereby increasing a moving speed in a stroke direction of the operating part more than in a general hydraulic cylinder and pneumatic cylinder. The actuator includes an oil pressure cushion type cushion part provided therein to absorb a shock generated by a shock of an operating part even at the time of a malfunction of the operating part and discharge an oil pressure generated by the shock to the outside and thus is used semi-permanently.

A hydraulic system for operating an automatic transmission for motor vehicles includes a hydraulic actuator for operating a clutch and a stop valve, whereas the actuator has a pressurizable actuating pressure chamber, which can be closed in a pressure-tight manner by means of the stop valve, such that the clutch pressure is maintained independent of the other pressures of the hydraulic system. The stop valve includes a closure device that is movable by means of a hydraulic control pressure (p_S) into a closed position, in which an actuating pressure chamber port, and thus the actuating pressure chamber, is closed by means of the closure device. The closure device is movable into an open position at least by means of the force of a spring, in which the actuating pressure chamber port is opened. Thereby, the stop valve features a shiftable locking device, by means of which the closure device can be fixed in the closed position.

A hydraulic system for operating an automatic transmission for motor vehicles includes a hydraulic actuator for operating a clutch and a stop valve, whereas the actuator has a pressurizable actuating pressure chamber, which can be closed in a pressure-tight manner by means of the stop valve, such that the clutch pressure is maintained independent of the other pressures of the hydraulic system. The stop valve includes a closure device that is movable by means of a hydraulic control pressure (p_S) into a closed position, in which an actuating pressure chamber port, and thus the actuating pressure chamber, is closed by means of the closure device. The closure device is movable into an open position at least by means of the force of a spring, in which the actuating pressure chamber port is opened. Thereby, the stop valve features a shiftable locking device, by means of which the closure device can be fixed in the closed position.

An actuator system comprising a rotatable lock mechanism defining a path for an actuator pin as the actuator is expanded and retracted, wherein the lock mechanism defines an entry passage through which the pin enters as the actuator extends, a guide surface along which the pin travels from the entry passage as the actuator retracts, a locking recess into which the pin is guided by the guide surface, and an exit passage into which the pin is guided as it is caused to leave the lock recess by extension of the actuator and subsequent retraction; whereby a detent surface is provided to prevent the pin returning back into the lock recess when the actuator is extended to cause the pin to leave the lock recess.

A device for locking a rod member is provided. The device includes a body section having a vertical hole therein, and a ring-type locking unit and a piston serially arranged along the hole, wherein the rod member is disposed in the hole to be axially movable through the locking unit and the piston. The locking unit may be a lock block including an outer ring having an inclined surface on one side thereof, thereby defining a wedge-type space, an inner ring coaxially disposed in one side of the outer ring and accommodating a pressurizing member interacting with the inclined surface, and a spring disposed in the other side of the outer ring so as to elastically connect the outer ring and the inner ring.

A device for locking a rod member is provided. The device includes a body section having a vertical hole therein, and a ring-type locking unit and a piston serially arranged along the hole, wherein the rod member is disposed in the hole to be axially movable through the locking unit and the piston. The locking unit may be a lock block including an outer ring having an inclined surface on one side thereof, thereby defining a wedge-type space, an inner ring coaxially disposed in one side of the outer ring and accommodating a pressurizing member interacting with the inclined surface, and a spring disposed in the other side of the outer ring so as to elastically connect the outer ring and the inner ring.