| 摘要 |
A lifting jack (10) includes a jacking portion (11) carried on a mobile frame (13). The jacking portion (11) includes a jacking ram (15) and has a jacking axis (61) corresponding to the direction along which the jacking ram (15) can extend. The jacking portion (11) also has a base (19) adapted for engagement with the ground (23) with the jacking axis (61) extending substantially vertically. The mobile frame (13) supports the jacking portion (11) for movement across the ground (23) and includes two ground wheels (33) rotatable about a substantially horizontal axis The jacking portion (11) has a first mode of operation in which the base (19) is in engagement with the ground (23) and the jacking axis (61) extends substantially vertically. The jacking portion (11) also has a second mode of operation in which the base (19) is elevated above the ground (23) and the jacking axis (61) extends substantially vertically. The jacking portion (11) also has a third mode of operation in which the jacking portion (11) has been rotated upwardly about the horizontal axis into a tilted condition facilitating wheeling movement of the lifting jack over the ground.
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