| 摘要 |
A knee-action chair control for a pedestal chair base comprises a base plate, a seat support plate pivotally mounted on the front of the base plate, a pair of compression springs operable between the plates for biasing the seat support plate toward an at-rest position relative to the base plate, and a novel adjustable spring preload mechanism operable between the base plate and one end of the compression springs. Additonally, there is an assembly locking plate removably mounted on the seat plate and engageable with the base plate for determining the at-rest position of the seat plate. Removal of the assembly locking plate during assembly of the control enables the compression springs and spring preload mechanism to be assembled without precompression of the springs.
|
