Hydraulic device for elevating/lowering chair

Details Hydraulic device for elevating/lowering chair Hydraulic device for elevating/lowering chair

2007-10-16

2007-10-16

Lazo, Thomas E. (Department: 3745)

Power plants

Pressure fluid source and motor

Ram driven by fluid pumped from reservoir

C060S482000, C297S344190

Reexamination Certificate

active

11390464

ABSTRACT:
A chair elevating/lowering hydraulic device includes at least a foot pump3which absorbs oil by an ascent of an operation lever1, which discharges oil stored by a stepping-on of the operation lever, and which discharges stored oil by a stepping-on of the operation lever to a lowest position, a check valve5which is opened by the oil pressure of the oil discharged from the foot pump, which is opened when the foot pump is lowered to the lowest position, and which allows the oil from the non-return side to pass to allow it to return to an oil tank through the foot pump, an elevating/lowering cylinder7, and an accumulator6.

REFERENCES:
patent: 2672917 (1954-03-01), Collura
patent: 3763651 (1973-10-01), Okiyama
patent: 6993905 (2006-02-01), Min et al.
patent: 2003/0213665 (2003-11-01), Min et al.
patent: 445 754 (1968-02-01), None
patent: 814 698 (1951-09-01), None
patent: 1 529 565 (1969-08-01), None
patent: 43 40 236 (1994-06-01), None
patent: 0 416 606 (1991-03-01), None

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