| 摘要 |
A mechanism for adjusting the height of a back relative to a seat in a seating assembly having a support member interconnecting the seat and the back. A recess is formed in an upright portion of the support member, and a toothed rack is secured within the recess. The upright portion of the support member is slidably engageable with a box-like unit secured to the back, and an engagement member is mounted to the box-like unit and disposed within the recess formed in the support member upright portion. The engagement member includes engagement structure selectively engageable with certain of the rack teeth to fix the position of the back relative to the support member. A biasing element urges the engagement member to an engagement position in which the engagement structure is engaged with certain of the one or more teeth. The biasing element also functions to retain the engagement member in a disengaged position when the back is fully raised, for enabling the back to be lowered without engagement of the engagement structure with the rack teeth. Release structure is engageable with the engagement member when the back is fully lowered so as to disengage the engagement member from the biasing element in preparation for subsequent positioning of the back by raising the back relative to the seat. |
