Deflectable seat back

摘要

A mechanism is provided for detachably interconnecting a seat base and a seat back of a chair such that the application of pressure to the seat back causes deflection therebetween and which returns to its normal orientation upon releasing the applied pressure. The mechanism includes a plate member secured to the chair frame adjacent the seat base. A upstanding link member is pivotably secured to the plate member and the two are interconnected with a spring member for providing resistance to the pivoting motion. The upstanding link member is further formed with a lost-motion slot through which extends a pin which is secured into the plate member for thereby limiting the amount of deflection. The upper portion of the upstanding link member is formed to receive a detachable seat back assembly. The detachable seat back mechanism of the present invention is also uniquely adapted to provide at least two means for adjusting the amount of pressure required on the seat back to cause deflection.