| 摘要 |
PURPOSE: A jack for preventing damage to a locker is provided to prevent a contact failure and work delay by preventing the locker from being damaged. CONSTITUTION: A locker(40) is formed along a longitudinal direction of a body(30) and has a ridge shape. A leading end of the locker is combined with one side(31) of the body. A rear end of the locker is installed on one side of the body to slide. If the locker is upwardly pressurized, the rear end of the locker is contacted with one side of the body. The height of the ridge becomes low by the sliding of the rear end of the body. The pressure is released, the locker is returned to an original state by an elastic restitution force.
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