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A chair armrest bar is horizontally slidably received in a channel of a base attached to a chair seat. The base defines longitudinally arranged interconnected slots in its bottom wall. A locking lever is pivotably mounted to the armrest bar. The lever has a locking pin which is biased into one of th

A chair armrest bar is horizontally slidably received in a channel of a base attached to a chair seat. The base defines longitudinally arranged interconnected slots in its bottom wall. A locking lever is pivotably mounted to the armrest bar. The lever has a locking pin which is biased into one of the slots to lock the armrest in position; the lever may be tilted to an unlocking position to allow the bar to slide. The lever is releasably attached to the bar by a mount so that the lever may be removed to allow replacement of the bar.

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[ What is claimed is:] [1.] An adjustment mechanism for a chair comprising:a base;an adjustable member;one of said base and said adjustable member defining a channel, the other of said base and said adjustable member comprising a bar slidably received by said channel;locking lever pivotally mounted

[ What is claimed is:] [1.] An adjustment mechanism for a chair comprising:a base;an adjustable member;one of said base and said adjustable member defining a channel, the other of said base and said adjustable member comprising a bar slidably received by said channel;locking lever pivotally mounted to a mount;a releasable attachment releasably attaching said mount to said bar;one of said base and said locking lever having a plurality of slots arranged longitudinally;the other of said base and said locking lever having a locking pin configured for locking reception in one said slots when said locking lever is in a locking position; anda resilient member to bias said lever towards said locking position, and wherein said bar defines an aperture and wherein said mount comprises a post received by said aperture and joined to said releasable attachment.