초록 ▼

A pump mechanism primarily designed for use in sealing and pressurizing a container for tennis balls and the like. An alternate embodiment is adaptable for use in pressurizing items such as game balls and air-inflated shock absorbers and forks as used on motorcycles. The pump has a cylinder with a o

A pump mechanism primarily designed for use in sealing and pressurizing a container for tennis balls and the like. An alternate embodiment is adaptable for use in pressurizing items such as game balls and air-inflated shock absorbers and forks as used on motorcycles. The pump has a cylinder with a one-way valve at the outlet end. A piston is provided for moving longitudinally in and out of the cylinder to provide the pumping action. The piston is hollow and contains a second, spring-biased piston therein. The side wall of the piston contains a relief channel or hole at a pre-set distance from the bottom thereof. As the pressure in the pump increases, the piston within the piston is forced back against the increasing bias of the spring. When the biased piston moves sufficiently to expose the outlet channel or hole, the pressure limit of the pump is reached as any additional pressure is vented therefrom.

대표청구항 ▼

A pressurization cap for a game ball container comprising: (a) an externally threaded collar adapted for positioning around the container to bear against the bottom of the top ring thereof; (b) an internally threaded cap adapted to be threaded onto said collar, said cap having a sealing gasket dispo

A pressurization cap for a game ball container comprising: (a) an externally threaded collar adapted for positioning around the container to bear against the bottom of the top ring thereof; (b) an internally threaded cap adapted to be threaded onto said collar, said cap having a sealing gasket disposed about the inner periphery thereof; (c) a cylinder carried by said cap having a one-way outlet valve communicating through said cap; (d) a piston disposed within said cylinder for recriprocating, pumping, motion, said piston having a hollow portion in communication with the pump\s cylinder, said hollow portion having a vent opening; (e) a piston member disposed within said hollow portion, said piston member being moveable by the pressure being developed by the piston during its compression stroke between a first position blocking said vent opening and a second position exposing said vent opening; and (f) bias means for biasing said piston member towards said first position and for preventing said second position from being reached until a desired pressure is attained in said cylinder whereby the pressure output of said pump is limited to said desired pressure.