| 摘要 |
A manhole cover for water and sewage, electricity and communication having a safety pin is provided to prevent a manhole cover from opening and to prevent the accompanying accidents by inserting a safety pin to a manhole cover and suspending on a hanging piece of a manhole cover, and limiting the rotation of the manhole cover. A manhole cover for water and sewage, electricity and communication having a safety pin contains: a manhole frame(1) installed on the upper part of a structure to keep airtight, coupled with a manhole cover and provided with reinforcing ribs(14) formed on the edge of a support panel(13) having many connecting holes(131) at regular intervals to support a seating part(11), which has many primary guide projections(12) to lock up a manhole cover; a manhole cover(2) provided with an end projection(22) having the smaller diameter than a manhole cover body(21), secondary guide projections to press-fit to the lower part of the primary guide projections, many nonskid projection(23) formed on the manhole cover body to prevent traveling vehicles from sliding while applying the brake, primary ring grooves(24,24') having primary hanging pieces(241,241') and a pin groove(32) formed between the primary ring grooves; a hanging piece(31) formed on the manhole frame to prevent the manhole cover from rotating backward and opening by the frictional force with tires while a traveling vehicle applies the brake; and a safety pin(33) composed of a hanging body(331) and a hanging head(332), inserted to the pin groove of the manhole cover and formed to be longer than the vertical length(L) from the seating part to the hanging piece to make the bottom suspended on the side of the hanging piece. |
