초록 ▼

A protective cover for swimming pools drains and the like. The cover is of a unitary construction and is preferably injection-molded from a flexible, tough, spring-like plastic. The cover includes an outer, annular rim designed to rest on a sub-main drain or the like. The main cover has no holes and

A protective cover for swimming pools drains and the like. The cover is of a unitary construction and is preferably injection-molded from a flexible, tough, spring-like plastic. The cover includes an outer, annular rim designed to rest on a sub-main drain or the like. The main cover has no holes and features a generally sine wave or bellows spring design. The central portion is inwardly or downwardly curved, and forms a portion of a sphere having its center on a line normal to a plane passing through the main cover. The central portion is surrounded by another inwardly curved portion which preferably is provided on its underside with a circular projection extending normal to the plane of the cover to lend it mechanical rigidity. The outer main cover portion is upwardly curved and is connected to the ring portion through a plurality of stanchions in the form of vanes extending in radial directions. Due to its spring-like construction, the cover will spring back under loads within elastic limits of the material and even limited overloads causing a permanent set will not cause the cover to lose its full function.

대표청구항 ▼

A drain cover for a swimming pool or the like, comprising: an annular support ring adapted for attachment to a drain housing; and a cover portion displaced from the plane of the ring and joined thereto by a plurality of generally equally spaced, radially-directed support stanchions defining a plural

A drain cover for a swimming pool or the like, comprising: an annular support ring adapted for attachment to a drain housing; and a cover portion displaced from the plane of the ring and joined thereto by a plurality of generally equally spaced, radially-directed support stanchions defining a plurality of openings about the periphery of the cover, the cover portion comprising a central, curved, recessed section smoothly joined to the surrounding remainder of the cover portion, said cover portion being continuous throughout its extent and symmetrical about the central axis of the cover.