Amortisseur à gaz

A gas strut, also known as a gas spring is a mechanical component that uses compressed nitrogen gas to force a precision rod attached to a piston back and forth within an enclosed metal cylinder. Gas struts are primarily designed as a direct support mechanism for safely lifting, positioning, lowering and counterbalancing different weights.

A gas strut comprises of a precision rod attached to a piston and a central tubular body containing compressed nitrogen gas and lubricating oil. When force is applied to the protruding portion of the rod it presses onto the piston head a bit like a plunger on a syringe, compressing the nitrogen gas. This creates an internal pressure that exceeds the pressure outside of the cylinder closing the gas strut. When the force is removed from the external rod the gas is decompressed and the pressure pushes the piston back out again, opening the gas strut.

Gas struts or gas springs are available as stop and stay or variable pressure with a steel or stainless-steel body. Depending on application stroke length, extended length, minimum and maximum force ranges and end fittings must be considered.

Gas struts are utilised in a wide range of applications. The most common use is for the gas spring is lifting and lowering of a car boot. Other areas include:
Boat access hatches
Cargo area on aeroplanes
Office furniture and chairs
Skylights
Office chairs and furniture
Machine guards and Conveyor gates