Swimming pool cleaners and overmolded components thereof
View Patent ↗Overmolding of softer materials onto ends of rigid plastic pipes is detailed. The pipes typically are components of automatic swimming pool cleaners and connect to valves made of softer, flexible material. Because of the overmolding, flexing of the valves during operation of the cleaners does not cause significant wear of the valves in the regions where they connect to the pipes.
1. A method of forming components of a swimming pool cleaner, the method comprising:
a. providing a fluid channel in the form of an inner pipe made of material having a first hardness;
b. overmolding or gluing onto the inner pipe a tubular diaphragm valve (i) comprising an open inlet, an open outlet, and a wall having a section intermediate the inlet and the outlet that is substantially collapsed absent manipulative pressure differential across the wall and (ii) made solely of flexible material softer than the first hardness, so that at least the interior of the tubular diaphragm valve is in fluid communication with the fluid channel and the flexible softer material of the tubular diaphragm valve contacts the harder material of the inner pipe;
c. providing an outer pipe surrounding at least a majority portion of the inner pipe; and
d. connecting in fluid communication an operating head having an inlet with the inlet of the tubular diaphragm valve.
2. A method according to claim 1 in which the tubular diaphragm valve is overmolded onto the inner pipe and the inner pipe is molded in a mold different than the mold used for overmolding the tubular diaphragm valve onto the inner pipe.
3. A swimming pool cleaner comprising:
a. a fluid channel in the form of an inner pipe made of material having a first hardness;
b. a tubular diaphragm valve, (i) made solely of flexible material softer than the first hardness, (ii) overmolded onto or glued to the inner pipe so that at least the interior of the tubular diaphragm valve is in fluid communication with the fluid channel and the flexible softer material of the tubular diaphragm contacts the harder material of the inner pipe, and (iii) comprising an open inlet, an open outlet, and a wall having a section intermediate the inlet and the outlet that is substantially collapsed absent manipulative pressure differential across the wall;
c. an outer pipe surrounding at least a majority portion of the inner pipe; and
d. an operating head having an inlet in fluid communication with the inlet of the tubular diaphragm valve.
4. A swimming pool cleaner according to claim 3 in which the tubular diaphragm valve is overmolded onto the inner pipe.