|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||220/343 ; 220/908 ; 220/909|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 30 인용 특허 : 0|
A cover of generally rectangular shape having a deformation reinforced central section comprises thermoforming top and bottom sheets of thermoplastic to form a specially configured arrangement of strengthening ribs which extend in longitudinal and oblique directions and of a post and receptacle centrally of the sheets, and pressing the sheets together to form a closed interior. The longitudinal ribs on the bottom sheet intersect and are welded to the oblique ribs or the top sheet respective and the post is welded into the receptacle to reinforce the cent...
A cover for use with a receptacle having an open top, said cover comprising a substantially planar body formed from upper and lower sheets of flexible polymer material and having a deformation reinforced central section sized to extend across the open top of the receptacle, said central section comprising a plurality of parallel linearly extending first stiffening ribs extending from one said sheet and welded to the other said sheet, and a pair of linearly extending second stiffening ribs extending from said other sheet, said second ribs intersecting one...