| 摘要 |
A foothold including a tread, side portions positioned at both sides of the tread, and legs to be inserted into a concrete wall. The tread, side portions and legs are formed of a core covered by synthetic resins. A plurality of fins are provided axially on outer peripheries of the synthetic resins which cover the legs, and pins are provided on the side portions so as to extend radially therefrom at portions adjacent boundaries between the side portions and legs. Universal washers are provided and are pressed against the concrete wall by the respective pins which are engaged in the side portions. The universal washers have substantially elliptical holes through which the side portions extend, and recessed grooves are provided along the short axis of the elliptical holes for accommodating the pins. With this arrangement, the legs can be easily and reliably fitted into the holes defined in the wall surface so that the foothold can be reliably fixed to a manhole wall. Further, since the universal washers are detachable from the foothold, a foothold small in size and low in cost can be achieved.
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