| 摘要 |
PROBLEM TO BE SOLVED: To provide a manually-operated movable floor device capable of easily raising and lowering a movable floor with a light force applicable to an operator for controlling a handle. SOLUTION: A manually-operated movable floor device 4 is constituted of a controlling means 5, a linking means 6 and a transferring means 7. By the operation of the handle 8 of the controlling means 5, and motive power is transferred to a first sprocket 13 through a second gear 12 engaged with a first gear 11. The linking means 6 has link arms 19 connecting one end to nut members 18 screwing in a trapexoid screw 17 and connecting the other end to a movable floor 3. Second sprockets 20a and 20b are provided to the ends of the trapexoid screw 17, and among the sprockets 13, 20a and 20b, an endless chain 21 is respectively chained on an appropriate pair of sprocket 13, 20a and 20b. The number of gears of the first sprocket 13 and second sprocket 20a and 20b corresponds to operator's power for controlling the handle 8.
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