| 摘要 |
A quick stand adjusting device for adjusting the height of the stand of a ladder, a chair, an instrument or equipment, comprising a split retainer controlled by a control device, which is comprised of a crank, a transmission rod and a movable stop block, to move in and out of a recessed chamber in a lock socket at the bottom so as to engage or release a support which is extendibly inserted in the stand.
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