| 摘要 |
PURPOSE:To step on respective step-on pads with uniform pressure without positional displacement, reduce stress acted' on respective piston rods, increase a buffer action at the step-on time, and judge whether it is surely stably stepped on. CONSTITUTION:In the case that a foot step-on mechanism is lowered, a step-on pad 14 toward a high ground level among the step-on pads is stepped on the ground at first and other pads 14 toward a low ground level are held in a floated state. In this state, the step-on pads are further lowered, the step-on pad 14 stepped previously and its piston rod 13 are then raised, a fluid in an upper space 17 is made to flow into upper spaces 17 of fluid pressure cylinders 11 of systems not stepped on yet through a pipe 18. Pistons 12, piston rods 13 and the step-on pads 14 are lowered to step on, and force in the vertical direction is uniformly distributed to respective step-on pads 14 and force in the lateral direction is made not to act on the respective piston rods 13 (i.e., legs). |
