Power unit for a medical or like stool

Details Power unit for a medical or like stool Power unit for a medical or like stool

1976-09-20

1978-02-21

Staab, Lawrence J.

Supports

Stand

Standard type

248400, F16M 1100

Patent

active

040748871

ABSTRACT:
A novel mechanical power unit for use in stool and the like construction having features allowing its easy application to great variety of additional uses. The power unit has a ram which is displaced within a cylinder under the influence of hydraulic fluid driven by compressed air. The fluid and compressed air are carried in a reservoir generally surrounding the cylinder, formed by the outer wall of the cylinder and the inner wall of a generally concentric shell welded permanently at its ends to the cylinder. A manually operable, normally closed valve is provided in the base of the cylinder to control transfer of fluid between the interior of the cylinder and the reservoir to operate the power unit, causing the ram to extend or retract with respect to the cylinder, and holding the ram in any amount of extension when the valve is closed. The ram end of the reservoir shell is shaped to form a pressure retaining dome, and the ram carries an adapter for ready attachment to any object to be powered, such as the seat of a stool. The opposing end of the reservoir shell is tapered to provide removable frictional engagement with a base, such as the floor-engaging part of the stool.

REFERENCES:
patent: 633021 (1899-09-01), Mason
patent: 2947556 (1960-08-01), Wenger
patent: 3147946 (1964-09-01), Hale
patent: 3381926 (1968-05-01), Fritz et al.
patent: 3865341 (1975-02-01), Fortnam et al.
patent: 3921952 (1975-11-01), Wirges

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