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Class Information
Number: 297/303.5
Name: Chairs and seats > Back movement resiliently opposed in operating position > Adjustable resistance > Coil spring > Coaxial adjustment member extends through coil
Description: Helical coil wherein the apparatus to vary displacement is mounted within the helical spring and abuts against the helical spring to compress or expand the coil.

Patents under this class:

Patent Number Title Of Patent Date Issued
8146990 Mechanism for an office chair Apr. 3, 2012
8113586 Apparatus for adjusting the seat back angle Feb. 14, 2012
8100477 Synchronizing device for an office chair Jan. 24, 2012
7866749 Adjustment device for a reclining chair Jan. 11, 2011
7815257 Adjustment device for adjustable chairs Oct. 19, 2010
7293833 Chair and support mechanism unit thereof Nov. 13, 2007
7281764 Tension control mechanism for chair Oct. 16, 2007
7080884 Chair with rapidly adjustable energy storing device Jul. 25, 2006
6945603 Chair, in particular office chair Sep. 20, 2005
6758523 Office chair Jul. 6, 2004
6712428 Reclining device for chairs and chair with said reclining device Mar. 30, 2004
6286900 Tilt control for chair Sep. 11, 2001
6174031 Actuator handle for an office chair Jan. 16, 2001
5704689 Chair having separable back Jan. 6, 1998
5397165 Synchronous movement adjustable seat support Mar. 14, 1995
5152580 Handle assembly for chair control mechanism Oct. 6, 1992
5114210 Tilting chair with improved lumbar support May. 19, 1992
4756575 Frame assembly for a chair Jul. 12, 1988
4653806 Pivotally and slidably connected cantilevered swivel seat Mar. 31, 1987
4650248 Adjustable chair Mar. 17, 1987
4561693 Back support tilt and seat and back support height control mechanism for a chair or the like Dec. 31, 1985
4555085 Lockable tilting apparatus for chair seats Nov. 26, 1985
4533177 Reclining chair Aug. 6, 1985
4479679 Body weight chair control Oct. 30, 1984
4345733 Mounting device for a chair seat Aug. 24, 1982
4232900 Chair control Nov. 11, 1980
4219233 Chair seat back tilt-adjusting mechanism Aug. 26, 1980
4200332 Adjustable chair Apr. 29, 1980
4189179 Low profile chair iron Feb. 19, 1980
4170382 Posture chair Oct. 9, 1979
4157203 Articulated double back for chairs Jun. 5, 1979
4014086 Safety feature for chair controls Mar. 29, 1977
4013258 Chair control for tiltable chairs Mar. 22, 1977

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