초록 ▼

A mechanism is provided for adjusting the height of the backrest relative to a chair seat. The adjustment mechanism for releasably retaining the backrest in a plurality of selected positions relative to a seat permits the chair to be shipped in a “knocked down”condition and easily assembled by the c

A mechanism is provided for adjusting the height of the backrest relative to a chair seat. The adjustment mechanism for releasably retaining the backrest in a plurality of selected positions relative to a seat permits the chair to be shipped in a “knocked down”condition and easily assembled by the consumer. The adjustment mechanism includes a channel member that is secured to the backrest, and a support member carried by the chair that is slidably received in the channel member and rigidly locked in selected positions. The support member has vertically aligned rack teeth and the backrest has a movable catch having pawls that are adapted to engage the rack teeth. Movement of the catch places the pawls into engagement with the rack teeth to prevent the downward movement of the backrest from a selected vertical position.

대표청구항 ▼

An adjustment mechanism for releasably retaining a backrest in a plurality of selected positions relative to a seat, the adjustment mechanism comprising: a channel member adapted to be rigidly secured to the backrest; a support member slidably received by said channel member and adapted to be rigidl

An adjustment mechanism for releasably retaining a backrest in a plurality of selected positions relative to a seat, the adjustment mechanism comprising: a channel member adapted to be rigidly secured to the backrest; a support member slidably received by said channel member and adapted to be rigidly secured to the seat; a first plurality of vertically aligned rack teeth extending in a generally lateral direction from the support member; a second plurality of vertically aligned rack teeth extending from the support member in the same direction as the first plurality of rack teeth, said second plurality of rack teeth being spaced apart from and generally parallel to said first plurality of rack teeth; a catch having spaced apart, horizontally aligned, first and second pawls extending in the opposite direction as the first and second plurality of rack teeth, said catch being slidably mounted to one of the channel member and the support member, wherein actuation of the catch causes movement thereof in a linear, horizontal direction to simultaneously selectively engage the first and second pawls with the respective first and second plurality of rack teeth; and a spring acting against the catch for biasing the first and second pawls into engagement with the first and second plurality of rack teeth; whereby the backrest is retained from falling downwardly from a desired vertical position by the engagement of the first and second pawls with the first and second plurality of rack teeth.