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|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||52/020 ; 52/019 ; 404/025|
|발명자 / 주소|
|출원인 / 주소|
|대리인 / 주소||
|인용정보||피인용 횟수 : 11 인용 특허 : 25|
A frame and cover for road surface installations has a one-piece cast metal frame member with an aperture therein to receive a cover member which can be used for catch basins, maintenance holes, valve chamber covers and underground vaults. The frame member has a side wall which extends smoothly downwardly between the upper and lower faces of the frame member and is free from laterally outer projections. Vibrations from vehicles moving over the frame and cover are transferred downwardly to the structure on which the frame is supported rather than to the a...
[ What is claimed is:] [1.] A road surface installation frame and cover comprising:a one-piece cast metal frame member having a generally planar upper face having an aperture therein, and including an edge wall extending downwardly from said aperture and having an inwardly projecting lip adjacent a lower edge of said edge wall; anda cast metal cover member received in said aperture and having an outer wall nesting within said edge wall and a lower edge supported on said lip;said cover member having at least one lug extending laterally outwardly from said...