초록 ▼

A gas spring substantially comprises a cylindrical housing, closed on one end, and a piston rod located concentrically in it and extending in a sealed manner from its other end, the piston rod being provided on its end located in the housing with a piston assembly resting on the inner wall of the ho

A gas spring substantially comprises a cylindrical housing, closed on one end, and a piston rod located concentrically in it and extending in a sealed manner from its other end, the piston rod being provided on its end located in the housing with a piston assembly resting on the inner wall of the housing and being guided in a damped manner. In order to attain a relatively broad hysteresis, which is desirable when the gas spring is used for retaining the upper parts of sun-tanning benches or automobile hatchbacks or the like, the piston assembly has a friction damping liner resting against the inner wall of the housing and made of an expanded plastic, which is open-celled and impregnated with lubricant on its friction face resting on the inner wall.

대표청구항 ▼

A gas spring, comprising a substantially cylindrical housing tightly closed at one end and a piston rod disposed concentrically in the housing and extending out of said housing in a sealed manner at the other end of said housing, the piston rod being provided on its end located in the housing with a

A gas spring, comprising a substantially cylindrical housing tightly closed at one end and a piston rod disposed concentrically in the housing and extending out of said housing in a sealed manner at the other end of said housing, the piston rod being provided on its end located in the housing with a piston assembly fixed thereto, said piston assembly comprising a sealing ring forming part of a valve means resting on the inner wall of the housing and being guided in a damped manner, wherein the piston assembly has a friction damping liner resting against the inner wall of said housing, and pneumatic damping means for pneumatically damping said piston assembly, said pneumatic damping means including at least one gas passage channel extending through said piston assembly and the valve means for restricting said channel as said piston assembly moves in a first direction in said housing and for opening said channel as said piston assembly moves in a direction opposite said first direction in said housing; said piston assembly including a holding means for retaining said friction damping liner in said piston assembly and against said inner wall of said housing, said holding means further defining at least a portion of the length of said channel; said friction damping liner comprising an expanded plastic band of foamed polyurethane impregnated with lubricant and constituting means for producing a damping force of between 30 and 120N in addition to said pneumatic damping.