초록 ▼

A restrainable manhole, handhole cover and open/close device therewith provides vertical pads at predetermined positions along a bottom edge of a manhole/handhole cover, which are integrally molded with a cover body. This forms an inclined a third edge which is longer than an inner diameter of a man

A restrainable manhole, handhole cover and open/close device therewith provides vertical pads at predetermined positions along a bottom edge of a manhole/handhole cover, which are integrally molded with a cover body. This forms an inclined a third edge which is longer than an inner diameter of a manhole/handhole neck such that it can prevent the cover body to bounce up and displace when being overlaid by a vehicle. Furthermore, a plurality of pre-molded flat plates are provided on predetermined locations perpendicular to the neck. A pre-punched hole is provided for each flat plate for accepting the vertical pad of the cover body for restraining the cover body in its position at the same time the cover body is overlaid by a vehicle.

대표청구항 ▼

[ What is claimed is:] [1.] A restrainable manhole/handhole cover and an open/close device therewith, wherein:said restrainable manhole/handhole cover comprises a pair of first vertical pads and a pair of second vertical pads integrally molded with a cover body at predetermined positions along a bot

[ What is claimed is:] [1.] A restrainable manhole/handhole cover and an open/close device therewith, wherein:said restrainable manhole/handhole cover comprises a pair of first vertical pads and a pair of second vertical pads integrally molded with a cover body at predetermined positions along a bottom edge of said cover body, wherein a vertex of said pair of first vertical pads and a front end of said cover body forming an inclined third edge having a length longer than an inner diameter of a handhole neck; andsaid open/close device comprises a jack and a mobile apparatus, wherein a flat platform is provided on said jack, four corners of said platform is bent upward with a predetermined width and angle, each of said corners has a screw hole to assemble with a screw bolt, a chain is installed at one end of each of said screw bolts, and a hanger hook is connected at a lower end of each of said chains, wherein a four bar linkage is provided under said platform and a screw rod penetrates through two opposite joints of said four bar linkage, wherein one end of said screw rod is connected with an operation rod, moreover said mobile apparatus includes a cross beam connected with said four bar linkage so as to support said jack, wherein said cross beam has two ends each connecting with a supporting foot and each of said supporting feet has two ends each installing a castor thereto, whereby by using said jack, said manhole/handhole cover is capable of hanging up easily for removing from place to place by said mobile apparatus.