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Class Information
Number: 297/300.4
Name: Chairs and seats > Back movement resiliently opposed in operating position > Back and seat adjust simultaneously > Back tilts while seat inclination adjusts > Torsion bar or torsion spring
Description: Simultaneously adjusted back and seat wherein the resilient member is a solid material considerably longer than it is wide, or is a corkscrew-type that twists to resist the tilting of the back.










Patents under this class:
1 2 3

Patent Number Title Of Patent Date Issued
8622474 Mobile ergonomic rotating adjustable chair with lumbar support Jan. 7, 2014
8485604 Seat assembly with an elastomer torsion-spring element Jul. 16, 2013
8480171 Office chair Jul. 9, 2013
8348341 Chair assembly with a backrest-adjusting device Jan. 8, 2013
8348342 Preference control mechanism Jan. 8, 2013
8272693 Tension mechanism for a weight-responsive chair Sep. 25, 2012
8177299 Chair more comfortable when seated in optimum posture while reclining May. 15, 2012
8172324 Preference control mechanism May. 8, 2012
8157326 Seat Apr. 17, 2012
8146990 Mechanism for an office chair Apr. 3, 2012
7997652 Tilt control mechanism for a chair Aug. 16, 2011
7735923 Tilt control mechanism for a chair Jun. 15, 2010
7726740 Backrest-tilting device Jun. 1, 2010
7513570 Control mechanism for a chair Apr. 7, 2009
7500718 Tilt tension mechanism for chair Mar. 10, 2009
7497516 Mobile joint with several stable positions, suitable for use in furniture Mar. 3, 2009
7481494 Adjustable chair arrangement Jan. 27, 2009
7429081 Tilt control mechanism for a chair Sep. 30, 2008
7410216 Tension adjustment mechanism for a chair Aug. 12, 2008
7384100 Flexible reclining chair Jun. 10, 2008
7367622 Tension adjustment mechanism for a chair May. 6, 2008
7325873 Seating unit Feb. 5, 2008
7273253 Chair ride mechanism with tension assembly Sep. 25, 2007
7264311 Synchrotilt seating unit with comfort surface Sep. 4, 2007
7243993 Tilting mechanism for a chair and a chair having the same Jul. 17, 2007
7172047 Seat brake apparatus Feb. 6, 2007
7165811 Control mechanism for seating unit Jan. 23, 2007
7147285 Reclining apparatus for chair Dec. 12, 2006
7097249 Tilting mechanism for a chair and chair having the same Aug. 29, 2006
6957863 Seating unit having motion control Oct. 25, 2005
6945602 Tilt control mechanism for chair Sep. 20, 2005
6913316 Chair Jul. 5, 2005
6874853 Chair Apr. 5, 2005
6869142 Seating unit having motion control Mar. 22, 2005
6840578 Chair improvement structure Jan. 11, 2005
6820936 Chair Nov. 23, 2004
6779847 Multi-task mid-pivot chair control mechanism Aug. 24, 2004
6739664 Chair May. 25, 2004
6709056 Preloaded spring arrangement, in particular for spring loading office chair synchronizing mechanisms Mar. 23, 2004
6705677 Chair with seatback and rotating damper device Mar. 16, 2004
6688688 Chair Feb. 10, 2004
6679553 Energy system assembly for seating unit Jan. 20, 2004
6598936 Multi-task mid-pivot chair control mechanism Jul. 29, 2003
6588843 Chair control Jul. 8, 2003
6588845 Chair Jul. 8, 2003
6585320 Tilt control mechanism for a tilt back chair Jul. 1, 2003
6582019 Tilt assembly for a chair Jun. 24, 2003
6536841 Synchrotilt chair Mar. 25, 2003
6523896 Chair Feb. 25, 2003
6513874 Chair, especially office chair Feb. 4, 2003

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