| 摘要 |
PROBLEM TO BE SOLVED: To slide a rear leg in opening/closing very smoothly by sufficiently ensuring the strength of a connecting rod connecting a footboard strong enough to support equivalent weight applied thereon. SOLUTION: The upper ends of a pair of right and left rear legs 2 spaced at a prescribed interval from those of a pair of right and left front legs 1 having a prescribed interval are extendably pivoted, the front portions of the right and left sides of a plurality of footboards 4 are rotatably pivoted on the inside of the front legs 1 through a pin 3', the rear portions of both right and left sides of the footboard 4 are rotatably connected and pivoted by the connecting rods 3 respectively to mount a supporting rod horizontally on the prescribed portion of the rear leg 2, and a separation preventing body preventing the separation of the connecting rod 3 having a putting-in/out fitting part to which the connecting rod 3 is inserted and a rotating fitting part into which the supporting rod is inserted. When the rear leg 2 is opened, the connecting rod 3 is inserted into the putting-in/out fitting part of the separation preventing body and the supporting rod to the rotating fitting part so as to ensure the horizontal position of the footboard 4.
|
