Chair with four-bar linkage for self-adjusting back tension
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Aug 29, 2000
Grant Date -
N/A
app pub date -
Jun 1, 1999
filing date -
Jun 1, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A control mechanism for a chair having a seat and back includes a first rigid member having a forward end and a rearward end with a first pivot mechanism provided proximate the forward end and a second pivot mechanism provided proximate the rearward end. A second rigid member has a forward end and a rearward end with the forward end being pivotably connected to the first pivot mechanism and with a third pivot mechanism provided proximate the rearward end. The second rigid member is secured to an underside of the seat. A third rigid member is provided having an upper end and a lower end with the lower end being pivotably connected to the third pivot mechanism. A fourth rigid member is provided having an upper end and a lower end, the upper end being rigidly connected to the third rigid member and the lower end being pivotably connected to the second pivot mechanism of the first rigid member. The upper end of the third rigid member is pivotably connected to the back of the chair. Thereby, shifting of a user's position on the seat provides a self-adjusting back tension feature of the chair.
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