| 摘要 |
PROBLEM TO BE SOLVED: To prevent light matter from being shifted in an elevated position by setting the rising speed slower as the load is smaller when a load carrying platform is in a lift position higher than a prescribed position. SOLUTION: In a control map, the lift height of a load carrying platform 3 is shown on the vertical axis, and the live load of the load carrying platform 3 is on the horizontal axis. Namely, when a first level switch 8a is OFF, the lift height of the load carrying platform 3 is set to H1 or less (low position), and when the load of the load carrying platform 3 at that time is W1 or less (very light matter), the control map is classified to group A. When the lift height of the load carrying platform 3 is H1 or less (low position), and the load of the load carrying platform 3 exceeds W1 (light matter), the control map is classified to group B. The rising speed of the group A is set smaller than the rising speed of the group B (A<B), so that the rising speed of the very light matter is lower than that of the light matter.
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