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A pneumatic shock absorber used primarily as a die spring includes a piston formed with a base and an upstanding cylindrical body provided with an internal fluid reservoir. An outer housing is mounted on the base and extends about the cylindrical body. An inner housing is axially telescopically moun

A pneumatic shock absorber used primarily as a die spring includes a piston formed with a base and an upstanding cylindrical body provided with an internal fluid reservoir. An outer housing is mounted on the base and extends about the cylindrical body. An inner housing is axially telescopically mounted for sliding movements within the outer housing. A flexible sleeve is enclosed at one end by a sealing cap and is sealingly connected at its outer end to the exterior of the piston body forming a fluid chamber therein which communicates with the fluid reservoir of the piston. An opening is formed in the piston body to fill the reservoir and chamber with a high pressure fluid which places the inner housing in an expanded position by the end cap pressing against an end wall of the inner housing upon axial expansion of the sleeve. Rolled end flanges formed on the housings engage each other to stop the movement of the inner housing at the expanded position. The inner housing moves axially within the outer housing compressing the fluid trapped in the fluid reservoir and chamber to absorb axial forces applied to the piston and inner housing. A coating of low friction material is applied to the inner surface of the inner housing and to the outer surface of the piston body to reduce the sliding and rolling friction with the flexible sleeve during axial movement of the inner housing.

대표청구항 ▼

A pneumatic shock absorbing device including: (a) a piston member having a base and an upstanding cylindrical body formed with an interior gas reservoir; (b) an outer housing mounted on the base of the piston member and extending about at least a part of the body of said piston member; (c) an inner

A pneumatic shock absorbing device including: (a) a piston member having a base and an upstanding cylindrical body formed with an interior gas reservoir; (b) an outer housing mounted on the base of the piston member and extending about at least a part of the body of said piston member; (c) an inner housing mounted for telescopic slideable movement within the outer housing and movable from a normal extended position toward a retracted position upon an axial force being applied to the inner housing; (d) a flexible elastomeric sleeve having a pair of open ends sealingly connected at one open end to the exterior of an outer end of the piston member body and enclosed at the other end by an end cap; (e) opening means formed in the piston member for admitting pressurized gas into the reservoir; (f) a pair of annular metallic stop rings secured to the interior of an open end of the outer housing and to the exterior of an open end of the inner housing, said rings being engageable with each other when the inner housing is in maximum extended position, each of said housings being formed of a metal dissimilar to the metal of its respective stop ring; and (g) a coating of a low friction material applied to an interior surface of the inner housing and to an exterior surface of the body of the piston member engageable with the flexible sleeve for reducing the frictional contact therebetween as the inner housing moves between the extended and retracted positions.