초록 ▼

A removable retainer has a plurality of lugs projecting outwardly from its surface for cooperating with a like number of lugs projecting inwardly from the inner surface of a body. The lower surface of the retainer lugs and the tipper surface of the body lugs have non-planar surfaces which cam off of

A removable retainer has a plurality of lugs projecting outwardly from its surface for cooperating with a like number of lugs projecting inwardly from the inner surface of a body. The lower surface of the retainer lugs and the tipper surface of the body lugs have non-planar surfaces which cam off of each other when the retainer is inserted into the body. The shock force from a weighted nozzle stem is transmitted through the lug system to the body and a surrounding pipe.

대표청구항 ▼

[ What is claimed is:] [1.]1. In an intermittently activated water delivery system for cleaning a swimming pool, comprising:a) a generally cylindrical body in communication with a source of water under pressure, said body being in open communication with the interior of the pool at a surface of the

[ What is claimed is:] [1.]1. In an intermittently activated water delivery system for cleaning a swimming pool, comprising:a) a generally cylindrical body in communication with a source of water under pressure, said body being in open communication with the interior of the pool at a surface of the pool structure;b) a stem having an axial bore and a nozzle portion at an upper region thereof, said stem being axially positioned in said body and axially movable from an inactive, retracted position therein to an active position in which the nozzle portion thereof projects outside the body within the pool when water under pressure is supplied to the body; andc) a generally cylindrical retainer in said body between the body and the stem for guiding movement of the stem;d) a plurality of lugs projecting inwardly from the inner surface of said body; ande) a plurality of lugs projecting outwardly from the outer surface of said retainer for cooperation with the lugs on said body to retain the retainer in said body; the improvement comprisingf) the lugs on said body and the lugs on said retainer have upper and lower surfaces and the upper surfaces of the lugs on the body are non-planar and the lower surfaces of the lugs on said retainer are non-planar.