|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||404/25 ; 428/117 ; 428/178 ; 52/20|
|우선권정보||GB-0031632 (1983-11-26); GB-0010982 (1984-04-30)|
|발명자 / 주소|
|인용정보||피인용 횟수 : 22 인용 특허 : 1|
A composite cover 10 for a manhole or other opening comprises an upper 12 and lower 14 skin of glass reinforced plastics material. The upper and lower skins are bonded to one another about the edges 18 and spaced apart from one another therebetween to define a space 16 containing reinforcing walls 20 extending between the upper 12 and lower 14 skins. The reinforcing walls 20 are preferably formed from a corrugated sheet of glass fibre reinforced plastics material. The cover of the invention is as strong as conventional cast iron covers but is lighter and...
A composite cover having high loadbearing capacity, comprising an upper and a lower skin of fiber reinforced thermosetting resin material, the upper and lower skins being integral with one another around the edges of the cover and spaced apart from one another therebetween, the space so formed containing reinforcing walls of fiber reinforced material extending between the upper and lower skins, the reinforcing walls being integral with the upper and lower skins where they contact the same, the voids between the reinforcing walls being filled with infills...