Balancing chair

Chairs and seats – Armrest – Adjustable to multiple use positions relative to bottom or back

Patent

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Details

2482761, 24828851, 29741133, 297173, A47C 754

Patent

active

059278153

ABSTRACT:
An articulated holding arm 2 comprises a first arm 3 and a second arm 5. The first arm 3 is essentially cylindrical as a whole, and is provided with at an intermediate area but closer to a proximal end 6 of the arm 3 a first spherical element 7 in a freely rotatable manner. The first arm 3 is further provided with at a distal end 4 thereof to which the proximal end 6 of the arm 3 is mounted a second spherical element 8 in a freely rotatable manner. Provided between the first and second spherical elements 7,8 is a locking spindle 9 which is moveable in a longitudinal direction of the arm 3 with a very short interval d. Provided at a proximal end 6 of the first arm 3 is a piston 11 which constantly pressurizes via spring means 12 the first spherical element 7 in a direction of a tip of the piston 11 and can move the first spherical element 7 via hydraulic means 14 or pneumatic means toward the proximal end 6 of the first arm 3 against the spring means 12. The second arm 5 is provided with at a distal end 19 thereof a supporting element 20 for supporting an arm A of a person seated D.

REFERENCES:
patent: 1772233 (1930-08-01), Vivier
patent: 1938643 (1933-12-01), Smith
patent: 3910538 (1975-10-01), Baitella
patent: 4277102 (1981-07-01), Aaras et al.
patent: 5029941 (1991-07-01), Twisselmann
patent: 5169207 (1992-12-01), Rye
patent: 5571274 (1996-11-01), Holstensson
patent: 5582464 (1996-12-01), Maymon

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