(57) [summary] was [purpose] the operating lever to one, you want to fight floor can be fixed. [Configuration] swing arm 2 extending from the suspended floor 1 upward The ligated swingably by a bearing 16 relative to the suspension arm 3, is connected swingably to one of the operation lever 7 to the tip of the suspension arm 3. And is connected to the intermediate portion of the operating lever 7 Plate 8 And connecting the pressing member 9 through, coupling the pressing member 9 and the swing arm 2 by a link rod 10. Stretched inversion spring 11 between the operating lever 7 and the suspension arm 3, and when you swing the control lever 7 to a predetermined upper limit rotation position, the stopper 12 for regulating the swing is in contact with the pressing member 9 person It provided to the suspension arm 3. When fixing the pressing member 9 by the stopper 12, the link rod 10 becomes immovable, the swing arm 2 becomes impossible rocking.
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