| 摘要 |
A triple mast type, slide type full free lift mast comprises a mast combination composed of an inner mast member, a middle mast member and an outer mast member, a combination of a free lift cylinder and a lift cylinder provided for the mast combination, and a chain for driving the inner mast member, the chain intervening between the inner mast member and the middle mast member. The inner mast member is higher in top level than the middle and outer mast members, as a lift bracket is held in a lowest position, and a chain wheel for the chain to be applied thereover is provided at an upper end part of the middle mast member, residing between a top level of the inner mast member and a top level of the middle mast member.
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