A gas cylinder actuator with safety device, which comprises: a tubular containment jacket, two opposing heads for closing the tubular jacket, with corresponding sealing elements between the heads and the jacket, a first head provided with a through hole for the passage of a stem-piston, and a second head provided with a gas filling duct, a stem-piston, between the tubular jacket, the heads and the stem-piston there being a chamber for pressurized gas; the second head has a seat for the accommodation of a flow control element of the gas filling duct and corresponding sealing means, the flow control element comprising a tab for controlling a retracting stroke of the stem-piston, the control tab protruding from a body that has a lightened portion for triggering a controlled fracture or deformation in the event the control tab is crushed by the stem-piston.

A pneumatic hydraulic retractable device includes a fluid pressure cylinder having a cylinder body and a plug seat disposed in the cylinder body, a piston rod movably disposed in the fluid pressure cylinder, a control valve set having a valve seat disposed at the piston rod and forms an upper fluid chamber and a lower fluid chamber with the cylinder body therebetween, and a valve rod disposed in the valve seat for controlling communication between the upper and lower fluid chambers, and a pressure relief element forming a pressure relief gap with the piston rod. The pressure relief gap communicates with the lower fluid chamber through a communication portion of the pressure relief element. As such, when the valve rod is opened, the fluid is allowed to flow between the lower fluid chamber and the pressure relief gap through the communication portion for reducing airtight effect.

A suspension system includes a first compression chamber and a second compression chamber with a damping chamber therebetween. The compression chambers may be independently filled with a compressible fluid, and the relative pressures may govern the rebound rate of the suspension. Seals that minimize friction, an adjustment system, and a stop are also included to enhance rider joy.

A gas cylinder actuator with safety device, which comprises: a tubular containment jacket, two opposing heads for closing the tubular jacket, with corresponding sealing elements between the heads and the jacket, a first head provided with a through hole for the passage of a stem-piston, and a second head provided with a gas filling duct, a stem-piston, between the tubular jacket, the heads and the stem-piston there being a chamber for pressurized gas; the second head has a seat for the accommodation of a flow control element of the gas filling duct and corresponding sealing means, the flow control element comprising a tab for controlling a retracting stroke of the stem-piston, the control tab protruding from a body that has a lightened portion for triggering a controlled fracture or deformation in the event the control tab is crushed by the stem-piston.

A pneumatic hydraulic retractable device includes a fluid pressure cylinder having a cylinder body and a plug seat disposed in the cylinder body, a piston rod movably disposed in the fluid pressure cylinder, a control valve set having a valve seat disposed at the piston rod and forms an upper fluid chamber and a lower fluid chamber with the cylinder body therebetween, and a valve rod disposed in the valve seat for controlling communication between the upper and lower fluid chambers, and a pressure relief element forming a pressure relief gap with the piston rod. The pressure relief gap communicates with the lower fluid chamber through a communication portion of the pressure relief element. As such, when the valve rod is opened, the fluid is allowed to flow between the lower fluid chamber and the pressure relief gap through the communication portion for reducing airtight effect.

A suspension system includes a first compression chamber and a second compression chamber with a damping chamber therebetween. The compression chambers may be independently filled with a compressible fluid, and the relative pressures may govern the rebound rate of the suspension. Seals that minimize friction, an adjustment system, and a stop are also included to enhance rider joy.

A vehicle reinforcing member includes first and second pistons movable in an axial direction in a cylinder. An inside of the cylinder is sectioned into a gas chamber and a main liquid chamber by the first piston, and the main liquid chamber is sectioned into a first sub-liquid chamber and a second sub-liquid chamber by the second piston. Gas is sealed in the gas chamber, and liquid is sealed in the first and second sub-liquid chambers. A piston rod is coupled to the second piston. The cylinder and the piston rod are respectively coupled to two locations of a vehicle body. A communication path connects the first sub-liquid chamber to the second sub-liquid chamber. A moving amount of the liquid in the communication path is adjusted by an adjuster such that a moving load through the second piston is adjusted.

A vehicle reinforcing member includes first and second pistons movable in an axial direction in a cylinder. An inside of the cylinder is sectioned into a gas chamber and a main liquid chamber by the first piston, and the main liquid chamber is sectioned into a first sub-liquid chamber and a second sub-liquid chamber by the second piston. Gas is sealed in the gas chamber, and liquid is sealed in the first and second sub-liquid chambers. A piston rod is coupled to the second piston. The cylinder and the piston rod are respectively coupled to two locations of a vehicle body. A communication path connects the first sub-liquid chamber to the second sub-liquid chamber. A moving amount of the liquid in the communication path is adjusted by an adjuster such that a moving load through the second piston is adjusted.

Height adjustable seat posts for bicycles are described herein. An example height adjustable seat post includes an upper tube and a lower tube configured in a telescopic arrangement and a piston in the upper tube. The piston divides the upper tube into first chamber and second chambers. The first and second chambers are filled with fluid. The height adjustable seat post also includes a valve including a fixed member and a rotatable member forming a face seal between a first face of the fixed member and a second face of the rotatable member. The fixed member has a fluid flow passageway. The rotatable member is rotatable relative to the fixed member between a closed position in which the rotatable member blocks the fluid flow passageway to prevent fluid flow between the first and second chambers and an open position to enable fluid flow through the fluid flow passageway and between the first and second chambers.

The gas spring includes a cylindrical cylinder body that stores gas, a piston body that partitions the inside of the cylinder body into a rod-side gas chamber and a piston-side gas chamber as having a flow path capable of allowing gas flow between the rod-side gas chamber and the piston-side gas chamber, a rod body that is connected to the piston body as having a hollow portion, a push rod that moves in the axial direction of the rod body with operation of an operator as being inserted to the hollow portion of the rod body, and a valve that the flow path with movement in the axial direction in the piston body as being arranged separately from the push rod and movable with the push rod.