A pneumatic-hydraulic control valve includes a valve base and a valve stem movably disposed in the valve base. A first inner oil guiding hole of the valve stem communicates with a first outer oil guiding hole of the valve base. A second inner oil guiding hole of the valve stem does not communicate with a second outer oil guiding hole of the valve base when the valve stem is closed, and communicates with the second outer oil guiding hole of the valve base when the valve stem is opened. Further, the valve stem has a first stressed portion for bearing a fluid closing force and a second stressed portion for bearing a fluid opening force. The outer diameter of the first stressed portion is larger than that of the second stressed portion. Thus, the present invention reduces a valve opening force without affecting the sealing effect.

A pneumatic-hydraulic control valve includes a valve base and a valve stem movably disposed in the valve base. A first inner oil guiding hole of the valve stem communicates with a first outer oil guiding hole of the valve base. A second inner oil guiding hole of the valve stem does not communicate with a second outer oil guiding hole of the valve base when the valve stem is closed, and communicates with the second outer oil guiding hole of the valve base when the valve stem is opened. Further, the valve stem has a first stressed portion for bearing a fluid closing force and a second stressed portion for bearing a fluid opening force. The outer diameter of the first stressed portion is larger than that of the second stressed portion. Thus, the present invention reduces a valve opening force without affecting the sealing effect.

An aircraft landing gear actuation system which uses two separate actuation forces to retract aircraft landing gear is disclosed. One of the actuation forces may be provided by an actuator, such as a hydraulic actuator. Another of these actuation forces may be provided by a pressurized fluid that is directed into the actuator through a conduit that extends into a hollow interior of an actuator rod of the actuator. The pressurized fluid may be provided from a pressurized fluid source that contains a fixed volume of pressurized fluid. This pressurized fluid may exert a force on an actuator piston of the actuator or the actuator rod. The pressurized fluid may also be used to dampen the deployment of the landing gear.

A linear actuator system includes a linear actuator including an outer body, an inner body disposed within the outer body, a fluid chamber at least partially extending between the inner body and the outer body, a piston chamber extending at least partially within the inner body, a valve configured to selectively fluidly couple the fluid chamber and the piston chamber to each other, a piston assembly including a piston, a variable volume within the piston chamber that extends between the piston and the valve, and a gas collector assembly including a fluid passageway. The piston assembly is disposed within the piston chamber, wherein a movement of the piston assembly causes a gas separated from a liquid within the variable volume to flow through the fluid passageway, through the valve, and into the fluid chamber.

A jammer system includes a jammer unit, a valve coupled to the jammer unit, and a sensor coupled to the valve. The jammer unit includes a jammer media and a membrane including an inlet. The membrane is configured to surround the jammer media. The valve is configured to allow a fluid to pass through the inlet of the membrane. The sensor is configured to cause actuation of the valve to evacuate the fluid from an interior of the membrane. The evacuation of the fluid from the interior of the membrane results in stiffening of the jammer media within the membrane.

A method of facilitating switching of a quasi-passive elastic actuator of a tunable actuator joint module of a robotic system between an inelastic state and an elastic state comprising configuring a quasi-passive elastic actuator to be operable with a primary actuator of the tunable actuator joint module to selectively apply an augmented torque to assist the primary actuator in rotation of a joint of the tunable actuator joint module. The method further comprises configuring an elastic component of the quasi-passive actuator to comprise a first vane device and second vane device rotatable relative to each other within a housing, supporting a valve assembly about the axis of rotation of the joint through the first vane device, and configuring a shunt circuit to facilitate fluid flow between compression and expansion chambers through the valve assembly. The method can further comprise configuring the valve assembly with a valve device disposed in an opening of a shaft of the first vane device, the valve device being actuatable between an open position to open the shunt circuit and a closed position to close the shunt circuit.

A linear actuator system includes a linear actuator including an outer body, an inner body disposed within the outer body, a fluid chamber at least partially extending between the inner body and the outer body, a piston chamber extending at least partially within the inner body, a valve configured to selectively fluidly couple the fluid chamber and the piston chamber to each other, a piston assembly including a piston, a variable volume within the piston chamber that extends between the piston and the valve, and a gas collector assembly including a fluid passageway. The piston assembly is disposed within the piston chamber, wherein a movement of the piston assembly causes a gas separated from a liquid within the variable volume to flow through the fluid passageway, through the valve, and into the fluid chamber.

A system (100), including: a fluidic actuator (2) which can be acted upon by a pressurized fluid and has an actuator member (3), a pressurized fluid provision device (4) which is adapted to carry out a position control of the actuator member (3) and, within the position control, to apply the pressurized fluid to the fluidic actuator (2) in order to move the actuator (3) into a prescribed position, the pressurized fluid provision device (4) being adapted to carry out the position control taking into account at least one system parameter, which describes a physical property of the system and/or a requirement parameter which defines a requirement for the positioning of the actuator (3), wherein the pressurized fluid provision device (4) is further adapted to perform an assistance procedure and to determine and/or verify, within the assistance procedure, the system parameter and/or the requirement parameter on the basis of a movement of the actuator (3) and/or a consideration of physical limits.

A saddle clamp for a bicycle includes a rail clamp, and a first and a second post clamp. The rail clamp includes a first rail clamp body configured to engage at least a portion of a first rail of a bicycle saddle, and a second rail clamp body configured to engage at least a portion of a second rail of the bicycle saddle, wherein the first and second rail clamp bodies are configured to cooperate to urge the first and second rails towards each other. Each post clamp is configured to engage a bicycle seat post, with the first and second post clamps disposed between the first and second rail clamp bodies, wherein the first and second post clamps are configured to exert a compressive force on the bicycle seat post in response to the first and second rail clamp bodies urging the first and second rails towards each other.

A gas spring system (3) for a height adjustable table (1) comprises a gas spring (4) having a gas spring cylinder (6) with a gas compartment (9) provided therein, a gas spring piston (7) arranged therein and a gas spring piston rod (8) joined thereto. The gas spring system (3) further comprises a gas interface (10), connected to the gas compartment (9), which at least inserts gas from outside into the gas spring system (3), a transfer cylinder (12) having a transfer piston (13), a first transfer chamber (14) and a second transfer chamber (15) separated by the transfer piston (13), and a hydraulic pump (16). The gas comportment (9) is connected to the first transfer chamber (14) and the hydraulic pump (16) is connected to the second transfer chamber (15). The hydraulic pump (16) conveys hydraulic oil and the transfer piston (13) is moved in direction towards the first transfer chamber (14) by the hydraulic oil conveyed by the hydraulic pump (16) in order to increase a pressure in the first transfer chamber (14) and in the gas comportment (9).