| 摘要 |
The present invention relates to a torque type manhole cover using a twisting motion for locking and, more specifically, relates to a manhole cover comprising: a cover frame having a seating groove; a manhole cover to be engaged with the seating groove of the cover frame, wherein a fastening groove is provided on a top; and a fixating unit fastened to the fastening groove to be rotated to pressurize an inner circumference of the cover frame. An operation portion is provided on one side of the fastening groove, a through-hole is provided on a bottom of the fastening groove, a curved guide protrusion is provided on the outer circumference of the fixating unit, and a spiral pressurization protrusion is provided on an outer surface of the guide protrusion. The pressurization protrusion pressurizes the inner circumference of the cover frame with a rotation of the fixating unit to make the manhole cover be fixated to the cover frame; thereby simply fixating the manhole cover to the cover frame without escape or movement, and prevents accidents without noise caused by friction. |
