| 摘要 |
A jack apparatus with a reaction force member is provided to improve compatibility by extending the jack apparatus as length of a screw shaft in spite of a small capacity hydraulic cylinder with a support member of the hydraulic cylinder. A jack apparatus includes an upper plate(2) supporting a member, a screw shaft(3) combined with the upper plate, a shaft holder(4) surrounding and supporting the screw shaft to freely move the screw shaft, a lower plate(5) formed in a lower part of the shaft holder to support the other member, a screw shaft push prevention member(6) thread-connected to the screw shaft to keep the jack apparatus extended by restricting the screw shaft from being pushed in moving the screw shaft out of the shaft holder, and a reaction force member(7) formed in the screw shaft between the upper plate and the screw shaft push prevention member and contacted to a stroke rod(9) of a hydraulic cylinder(8) to move the screw shaft out by supporting stroke extension of the hydraulic cylinder. The reaction force member is thread-connected to the screw shaft and moved spirally. |
