| 摘要 |
C:/NRPortbl/DCC/KMH/5120850_l.DOC- 10/05/2013 A jacking device, including a base member, including a lower surface adapted to engage a substrate surface, and a plurality of base sidewalls extending upwardly therefrom; an upper member, including an upper surface adapted to engage an object to be raised or lowered, and a plurality of upper sidewalls extending downwardly therefrom, whereby the upper sidewalls are adapted to at least partially surround the lower sidewalls; a drive mechanism, including a hydraulic, electric, pneumatic or other drive mechanism, adapted to raise or lower said upper member relative to and about said lower member; a guide mechanism, adapted to guide movement of and/or lock said upper member relative to said base member to thereby lock said jacking device such that it cannot be moved without further driving said drive means. Figure 2 |
