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Class Information
Number: 297/301.4
Name: Chairs and seats > Back movement resiliently opposed in operating position > Back adjusts independent of seat > Coil spring
Description: Opposed back movement where the resilient member is helical, and whereby movement is countered by compression or expansion.

Patents under this class:

Patent Number Title Of Patent Date Issued
8506013 Vehicle seat Aug. 13, 2013
8348346 Recliner with dual functions Jan. 8, 2013
8251449 Multi-section angle adjusting structure for a chair back Aug. 28, 2012
8113586 Apparatus for adjusting the seat back angle Feb. 14, 2012
7819473 Chair Oct. 26, 2010
7802847 Angle-adjusting structure for backrest of chair Sep. 28, 2010
7784870 Six bar mechanism and control for chair Aug. 31, 2010
7614697 Coupling mechanism interposed between a seat and a back of a chair to prevent a reclining motion of the back from tilting the seat Nov. 10, 2009
7416252 Backpost unit of wooden dining chair with reclining mechanism Aug. 26, 2008
7344195 Dampener for a vehicle seat recliner Mar. 18, 2008
7293832 Chair adjustable device Nov. 13, 2007
7293833 Chair and support mechanism unit thereof Nov. 13, 2007
7249801 Cushioning device to cushion the backrest of a chair, an armchair, an office chair or similar Jul. 31, 2007
7198328 Locking device for an office chair structure with an articulation permitting the movement of the seat and the seat back and related structures of the chair Apr. 3, 2007
7159943 Adjustable office arm chair structure with articulation for the synchronous movement of the seat and the backrest Jan. 9, 2007
7140677 Ball chair Nov. 28, 2006
7118177 Chair with tiltable backrest Oct. 10, 2006
6974188 Chair with pivotable chair back Dec. 13, 2005
6932431 Chair having novel tilt control mechanism Aug. 23, 2005
6874853 Chair Apr. 5, 2005
6709056 Preloaded spring arrangement, in particular for spring loading office chair synchronizing mechanisms Mar. 23, 2004
6607244 Reclining chair Aug. 19, 2003
6588843 Chair control Jul. 8, 2003
6572191 Chair, in particular office chair, having a synchronous mechanism Jun. 3, 2003
6276755 Swivel arrangement for a chair seat Aug. 21, 2001
6213552 Multi-position chair control mechanism for synchronously adjusting the seat and backrest of a chair Apr. 10, 2001
6120096 Mechanical device for synchronous movement of the backrest and seat of a chair Sep. 19, 2000
6059363 Chairback with side torsional movement May. 9, 2000
6039398 Device for adjusting the inclination of the back-rest relative to the seating portion in chairs in general Mar. 21, 2000
6039397 Tilt back chair control Mar. 21, 2000
5951109 Chairback with side torsional movement Sep. 14, 1999
5918935 Reclining chair Jul. 6, 1999
5909926 Vehicle seating assembly Jun. 8, 1999
5725276 Tilt back chair and control Mar. 10, 1998
5704689 Chair having separable back Jan. 6, 1998
5658045 Chair with adjustable seat and backrest Aug. 19, 1997
5511852 Adjustable backrest for a chair Apr. 30, 1996
5505522 Deflectable seat back Apr. 9, 1996
5452937 Plate for connecting the seat, back and legs, especially for chairs Sep. 26, 1995
5447357 Chair with inclinable seat Sep. 5, 1995
5427434 Chair tilt and height adjustment mechanism Jun. 27, 1995
5344215 Backrest recliner mechanism Sep. 6, 1994
5222783 Chair with its backrest adjustable in its angle Jun. 29, 1993
5174630 Resilient seat back return device Dec. 29, 1992
5092653 Chaise lounge having adjustable canopy with combined lock and return strut Mar. 3, 1992
5042876 Controller for seating and the like Aug. 27, 1991
4711491 Swivel tilt mechanism for chair Dec. 8, 1987
4208071 Reclinable seating structure Jun. 17, 1980
4165900 Reclinable seating structures Aug. 28, 1979
4123103 Chair control for a tiltable stenographer's chair Oct. 31, 1978

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