Pneumatic spring

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

Patent

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Details

F16F 9/02 (2006.01) E05F 3/02 (2006.01) F16F 9/32 (2006.01) F16F 9/34 (2006.01) F16F 9/36 (2006.01)

Patent

CA 2222799

A pneumatic counterbalance spring (10) includes a hollow cylinder (15) defining a first internal chamber (20) divided into a compression compartment (50) and an extension compartment (55) by a piston (25) movably mounted in the chamber. The compression compartment (50) contains pressurized gas and a seal assembly (60) which is mounted on the piston (25) prevents the gas from escaping into the extension compartment (55). A piston rod is slidably mounted in the open end of the piston. The piston rod (30) includes a hollow portion defining a second internal chamber (125) which is fluidly connected to the compression compartment (50) by a flow passage (140). A gas permeably insert (150) may be positioned in the flow passage to provide restricted rate flow of gas through the flow passage.

L'invention concerne un ressort d'équilibrage pneumatique (10) qui comprend un cylindre creux (15) définissant une première chambre interne (20) divisée en un compartiment de compression (50) et un compartiment d'extension (55) par un piston (25) monté mobile dans ladite chambre. Le compartiment de compression (50) contient du gaz sous pression et un ensemble joint (60) monté sur le piston (26) empêche le gaz de se dégager dans le compartiment d'extension (55). Une tige de piston est montée coulissante dans l'extrémité ouverte du piston. La tige de piston (30) comprend une section creuse définissant une seconde chambre interne (125) qui est mise en communication fluidique avec le compartiment de compression (50) par un passage d'écoulement (140). Une pièce rapportée (150) perméable au gaz peut être positionnée dans le passage d'écoulement afin de parvenir à un débit réduit du gaz à travers le passage d'écoulement.

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