| 摘要 |
PROBLEM TO BE SOLVED: To provide a screw jack for pushing up building structures capable of performing an operation of the jack while a person lifts one of building components fixed to the jack.SOLUTION: A screw jack comprises: a motor 1 for rotating a screw 3 of a screw jack; a switch 8 capable of remote control of forward and reverse rotation and a stop of the motor; an impact clutch 2 for coupling the motor and the screw; a nut 4 going up and down by forward and reverse rotation of the screw; a rod 5 for pushing-up a structure fixed to the nut; and means 6 for holding an action part fixed to an action part of the rod with the structure. |
