Chair with pneumatically adjustable seat height and back support

Details Chair with pneumatically adjustable seat height and back support Chair with pneumatically adjustable seat height and back support

1976-05-17

1978-02-07

Parsons, Jr., Marion

Supports

Stand

Standard type

188300, 248354H, 297326, 297355, 267127, A47C 740

Patent

active

040722880

ABSTRACT:
The height of a chair and the inclination of its back support may be varied by changing the respective, effective lengths of two pneumatic springs whose assembly forms the chair leg. The cylinder of one spring is coaxially received in the cylinder or the hollow piston rod of the other spring, and relative axial movement of the received spring and the receiving element of the other spring is limited or entirely prevented. A valve connects the two compartments separated in the cylinder of each spring and may be operated by a mechanism separate from the valve operating mechanism of the other spring.

REFERENCES:
patent: 3436048 (1969-04-01), Green
patent: 3735958 (1973-05-01), Hollingsworth
patent: 3756654 (1973-09-01), Bauer
patent: 3837704 (1974-09-01), Bauer
patent: 3880465 (1975-04-01), Scheben

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