Gas spring having an intermediate stop function and temperature compensation

A gas spring, comprising:

• a cylinder containing a fluid, at least part of which is a compressed gas;
• a piston affixed to a piston rod, said piston being received in the cylinder and dividing the cylinder into two working chambers;
• the piston having a one-way valve responsive to the direction of motion of the piston in the cylinder and a pressure-control valve comprising a spring and a valve body arranged in parallel with the one-way valve;
• the piston being received on a pin of the piston rod and fastened thereto, and a portion of an aperture in the piston that receives the pin of the piston being a valve antechamber for the pressure-control valve;
• a bypass in a first stroke region of the piston which allows fluid flow past the one-way valve and the pressure-control valve, the first stroke region being adjoined by a bypass-free stroke region, the gas spring being arrested in the bypass-free stroke region;
• the spring of the pressure-control valve exerting a temperature-dependent elastic force, the elastic force being greater with increasing operating temperatures;
• whereby the compressive force necessary for opening the pressure-control valve increases in correspondence with increases in operating temperatures of the gas spring.

A gas spring, comprising:

• a cylinder containing a fluid, at least part of which is a compressed gas;
• a piston affixed to a piston rod, said piston being received in the cylinder and dividing the cylinder into two working chambers;
• the piston having a one-way valve responsive to the direction of motion of the piston in the cylinder and a pressure-control valve comprising a spring and a valve body arranged in parallel with the one-way valve;
• the piston having a sleeve section and a base, and the base having a passage which is blocked by the valve body of the pressure-control valve when the pressure-control valve is closed;
• the sleeve section of the piston having a sealing piece on which a portion of the spring of the pressure-control valve is supported;
• the sealing piece having a slot-shaped guide for an arm portion of the spring of the pressure-control valve;
• the slot-shaped guide having a stop surface on which, at extremely low temperatures, the arm portion of the spring comes to rest;
• a bypass in a first stroke region of the piston which allows fluid flow past the one-way valve and the pressure-control valve, the first stroke region being adjoined by a bypass-free stroke region, the gas spring being arrested in the bypass-free stroke region;
• the spring of the pressure-control valve exerting a temperature-dependent elastic force, the elastic force being greater with increasing operating temperatures;
• whereby the compressive force necessary for opening the pressure-control valve increases in correspondence with increases in operating temperatures of the gas spring.