HEIGHT ADJUSTMENT DEVICE IN FIXTURE, AND ARMREST DEVICE FOR CHAIR PROVIDED WITH HEIGHT ADJUSTMENT DEVICE

摘要

An armrest device for a chair includes a lower support rod that rises at a side of a chair seat and has a tubular upper end portion; and an upper support cylinder that has an armrest provided in an upper end thereof, is externally fitted to the lower support rod so as to be slidable in an up-down direction, and has a plurality of engaging portions therein. The armrest is made height-adjustable with respect to the lower support rod by disposing the locking member and a biasing member at an upper end portion of the lower support rod and providing the rotating rod inside the lower support rod.

主权项

1. A height adjustment device in a fixture comprising:
a support; a movable member that is mounted on the support so as to be movable in an up-down direction, has a plurality of engaging portions arranged side by side in the up-down direction therein, and extends in the up-down direction; a locking member that is provided at the support so as to be movable in a horizontal direction and immovable in the up-down direction to a locking position where the locking member is selectively engaged with any one engaging portion of the movable member and to an unlocking position where the locking member is disengaged from the engaging portion; a biasing member that is provided at the support and biases the locking member toward the locking position; an actuating member that is provided at the movable member, is made movable in the up-down direction with respect to the support and the locking member together with the movable member, keeps an action portion, which is slidable up and down with respect to the locking member, engaged with the locking member even if being moved in the up-down direction, and makes the locking member movable in a direction of the unlocking position at any up-down position; and an operating member that is provided at the movable member and actuates the actuating member so as to move the locking member in the direction of the unlocking position via the actuating member.