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US 7,458,314 B2Granted
Gas spring
AssigneeKayaba Industry Co., Ltd.
InventorsTakashi Asa, Hiroshi Murota, Yasushi Saitou
Life of this patent
Estimating the term…
Abstract
A gas spring (1) comprises a piston rod (4) projecting from an open end of a cylinder (2) so as to be able to elongate and contract axially, and a dust seal (10) which is in contact with the piston rod (4) to prevent dust from invading the cylinder (2). By fitting a seal protecting member (21) to the open end of the cylinder (2) to shield the dust seal (10) from exposure to the outside of the cylinder (2), protection of the dust seal (10) from deterioration and damage is enhanced.
Claims10
A gas spring comprising:
- a cylinder having an open end and being filled with a gas;
- a piston rod projecting outward from the open end of the cylinder in accordance with a pressure of the gas, which performs elongation/contraction depending on an axial load exerted thereon;
- a dust seal disposed in the cylinder in contact with the piston rod to prevent dust from entering the cylinder through the open end thereof;
- a seal protecting member which shields the dust seal from exposure to the outside of the cylinder, and having an engaging portion having a cylindrical shape, and a shield portion extending inward from a tip of the engaging portion towards the piston rod;
- and
- a bearing which is fixed to the open end of the cylinder to allow the piston rod to slide therethrough, and retains the dust seal and the protecting member thereon, said bearing comprising a small diameter part forming an annular space between an inner circumference of the cylinder and the bearing, the engaging portion of said seal protecting member being fitted on an outer circumference of the small diameter part.
3 more elements
Dependencies are inferred from the claim text.