| 摘要 |
A jack having an elongatable jack body comprising a pair of telescopically mutually slidable members (2,4) forming a housing, a fluid pressure ram positioned within the housing such as to force elongation of the jack body in use, and a locking fork (8) having arms (9) positionable in holes (7) in member (4) to engage the member (2) to form a mechanical barrier against shortening of the jack body. The jack can be operated front the hydraulic fluid system of a tractor. <IMAGE> |
