Patent ID: 6109694
Filing Date: 2000-08-29
Classification: A47C

Abstract:
A control mechanism for a chair having a seat and back comprising:a first rigid member having a forward end and a rearward end with first pivot means provided on said first rigid member proximate said forward end and with second pivot means provided on said first rigid member proximate said rearward end;a second rigid member having a forward end with third pivot means provided on said second rigid member proximate said rearward end, said forward end of said second rigid member being pivotably connected to said first pivot means;said second rigid member being secured to an underside of said seat;a third rigid member having an upper end and a lower end, said lower end being pivotably connected to said third pivot means; anda fourth rigid member having an upper end and a lower end, said upper end being rigidly connected to said third rigid member and said lower end being pivotably connected to the second pivot means of said first rigid member;said upper end of said third rigid member being pivotably connected by fourth pivot means to the back of the chair;wherein shifting of a user's position on the seat of the chair causes self-adjusting back tension of the back of the chair.