| 摘要 |
A height adjusting device for manually positioning and automatically locking in place a chair backrest relative to a chair seat, or any other elements requiring relative positioning comprises a track member engaged with and telescoping from a support member, a lock pin and a spring. The track member is provided with guide members internally and axially disposed within the lateral faces of a cavity in the track member, so as to provide for firm yet tolerant and slideable engagement with the support member. The lock pin is trapped, yet free to move, responsive to gravity, along a cam slot in the support member, and, responsive to a spring retained on the support member produces an audible "click" when moved to a position of engagement with notches along a slot on the track member. The device is particularly tolerant where the engagement of the support member and the track member is concerned, so as to facilitate manufacture, and is therefore economical and highly reliable.
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