Gas spring with speed regulation

F - Mech Eng,Light,Heat,Weapons – 16 – F

Patent

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Details

F16F 9/02 (2006.01) F16F 9/34 (2006.01)

Patent

CA 2238150

A gas spring comprising a cylindrical body in which a main piston is slidable and carries a piston rod extending in sealed manner outwardly of the cylinder. The main piston includes a bore connecting with a labyrinthine passageway. The interior of the cylinder contains a fluid comprising gas under pressure and (optionally) some oil. The gas urges the piston rod outwardly of the cylinder. During the corresponding travel of the piston, the fluid transfers from one side of the piston to the other in a controlled manner through the bore and the passageway to allow relatively rapid travel. However, when the main piston comes into contact with a second piston, freely slidable on the piston rod and biassed towards the main piston by a compression spring, this contact closes off the end of the fluid passageway, and fluid can now only transfer through the main piston by passing through a narrow radial channel, thus reducing the speed of outward travel of the piston rod. During this further outward travel, the main piston drives the second piston towards an abutment against the force of the spring.

Ressort pneumatique constitué par un corps cylindrique dans lequel se déplace un piston principal dont la tige sort du cylindre par un orifice étanche. Le piston principal présente un alésage communiquant avec un passage en labyrinthe. La chambre du cylindre renferme un fluide, notamment un gaz sous pression et, facultativement, de l'huile. La pression du gaz agit sur le piston et fait sortir la tige du piston hors du cylindre. Durant cette partie de la course du piston, le gaz passe d'un côté du piston à l'autre à une vitesse déterminée, en empruntant l'alésage et le passage en labyrinthe, ce qui permet un déplacement relativement rapide du piston. Lorsque le piston principal entre en contact avec un piston secondaire qui coulisse librement sur la tige du piston principal et est poussé en direction du piston principal par un ressort à compression, le contact ferme le passage de fluide, et celui-ci ne peut plus traverser le piston principal qu'en passant par un étroit passage radial, ce qui réduit la vitesse à laquelle la tige du piston sort du cylindre. Durant cette deuxième partie de la course du piston principal, celui-ci repousse le piston secondaire vers une butée en s'opposant au ressort de compression.

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