Positioning device

Details Positioning device Positioning device

1987-05-01

1989-05-16

Aschenbrenner, Peter A.

Chairs and seats

Back movement resiliently opposed in operating position

Constantly oriented during up-and-down movement

267131, 297306, 297DIG3, A47C 300

Patent

active

048304328

ABSTRACT:
A positioning device is used for the positioning of a chair seat as to its inclination, or for positioning a back-rest member of a chair. The positioning device is constructed such as usual hydropneumatic springs which can be locked by closing a passage connected to working chambers on both sides of a piston. The working chambers are filled with an operating liquid. In order to adapt the biasing force of such a positioning device, one of the working chambers is conneced with a force-measuring device, which force measuring device is provided within the force transmission path of the respective chair column. The force measuring device comprises a measuring space filled with operating liquid, and this operating liquid is in liquid connection with one of the working chambers.

REFERENCES:
patent: 2253190 (1941-08-01), Mistral
patent: 3140118 (1964-07-01), Dorn
patent: 3388883 (1968-06-01), Axthammer et al.
patent: 3415159 (1968-12-01), Hornlein et al.
patent: 3447645 (1969-06-01), Dorner et al.
patent: 3652126 (1972-03-01), Folling
patent: 4364605 (1982-12-01), Meiller
patent: 4479679 (1984-10-01), Fries et al.
patent: 4709962 (1987-12-01), Steinmann

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