Chair backrest linkage mechanism

Details Chair backrest linkage mechanism Chair backrest linkage mechanism

A - Human Necessities

47

C

155/49, 155/50

A47C 1/032 (2006.01)

Patent

CA 1311407

Abstract of the Disclosure A chair includes a compact backrest linkage mechanism for enabling the chair backrest and seat to tilt. The linkage mechanism comprises a pair of backrest levers pivotally connected to respective chair frame members near the chair back legs. A seat lever is pivotally connected to each chair frame member near the front legs. The backrest lever and seat lever pivotally connected to each chair frame member are connected to each other by an anti-friction sliding joint. Springs acting between the seat levers and chair frame members bias the seat levers and backrest levers to a normal configuration where the seat levers and backrest levers are positively located. A person sitting in the chair can tilt the backrest and simultaneously pivot the seat in only one direction from the normal configuration, that direction being to tilt the backrest backwardly and to raise the back end of the seat.

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