Height adjustment mechanism for chair components

Claim 1

A chair height adjustment mechanism for releasably adjusting height of one chair component in any plurality of positions relative to another chair component and relative to a chair frame comprising: a. a J-bar which is rigidly secured to a said chair frame; b. a guide plate is rigidly secured to said one chair component having at least two tracks for slidably receiving said J-bar for sliding movement between two extreme positions; c. latching means for releasably latching said guide plate to said J-bar comprising: i. a latch bar pivotally mounted on the J-bar having; ii. a latch tip at one end of said latch bar; iii. a release end at other end of said latch bar; iv. a pivot screw for pivotally mounting said latch bar on said J-bar; v. a slot in said guide plate; vi. a plurality of lock notches on one side of said slot for releasably receiving said latch tip having a highest lock notch at one end of said plurality of lock notches and a lowest lock notch on another end of said plurality of lock notches; d. a release cam on said slot extending from said lowest lock notch for releasably receiving said release end of said latch bar and pivoting said latch bar about said pivot screw to a standby position away from said lowest lock notch; e. an engaging cam on said slot extending from said highest lock notch for slidably receiving and pivoting said latch bar about said pivot screw from said standby position to latch highest lock notch.