Cylinder apparatus

Details Cylinder apparatus Cylinder apparatus

2007-08-07

2007-08-07

Lopez, F. Daniel (Department: 3745)

Expansible chamber devices

With cushioning means effective over a portion only of stroke

C188S284000

Reexamination Certificate

active

10638512

ABSTRACT:
In a cylinder apparatus such as a hydraulic shock absorber, a piston to which a piston rod is connected slidably is inserted into a cylinder which contains liquid oil. A rebound spring is wound around the piston rod with one end of the piston rod fixed to the piston rod using a spring holder. The rebound spring is slidably guided along the piston rod by means of another spring holder. A rebound stopper is fixed to the piston rod at a position between the spring holders. The rebound spring exerts a spring force opposite to the extension of the piston rod, thereby to moderate shock at the end of the stroke of the piston. Because the spring holder comes into contact with the rebound stopper, contact of adjacent linear portions of the rebound spring with each other due to excessive compression of the rebound spring can be prevented, and also occurrence of strange noise and damage of the rebound spring can be prevented.

REFERENCES:
patent: 5024301 (1991-06-01), Cook
patent: UM 4-95332 (1992-08-01), None
patent: H 05-321970 (1993-12-01), None
patent: 2001-193782 (2001-07-01), None
patent: 2002-257178 (2002-09-01), None

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