Height adjusting device

Details Height adjusting device Height adjusting device

1991-04-30

1992-05-26

Look, Edward K.

Expansible chamber devices

With inspection window in expansible chamber wall portion

With lock

188300, 267 6412, F15B 2100, F16F 932

Patent

active

051157233

ABSTRACT:
A height adjusting device includes an outer cylinder, an inner cylinder disposed inside the outer cylinder, a fluid reservoir confined by the inner cylinder, and a fluid receiving space formed between the inner and outer cylinders. Fluid flows from the fluid reservoir to the fluid receiving space to retract the height adjusting device. A piston is provided between the inner and outer cylinders and is biased by a spring member to force fluid in the fluid receiving space to flow back into the fluid reservoir, causing expansion of the height adjusting device. The height adjusting device further includes a flexible fluid resisting ring that prevents untimely expansion of the height adjusting device by hindering fluid flow from the fluid receiving space into the fluid reservoir, which fluid flow is caused by the expanding force of the spring member.

REFERENCES:
patent: 3415159 (1968-12-01), Hornlein et al.
patent: 3828651 (1974-08-01), Dorner et al.
patent: 3913901 (1975-10-01), Molders
patent: 4318536 (1982-03-01), Bauer
patent: 4824081 (1989-04-01), Pauliukonis
patent: 4856762 (1989-08-01), Selzer
patent: 5005677 (1991-04-01), Bucholtz et al.

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