초록 ▼

In one trigger operated dispenser pump a variable volume pump chamber is formed by a flexible bulb having a flange on its upper end which serves as a gasket and carries depending flaps which form inlet and outlet check valves for the chamber. In two other arrangements, the pump chamber is formed by

In one trigger operated dispenser pump a variable volume pump chamber is formed by a flexible bulb having a flange on its upper end which serves as a gasket and carries depending flaps which form inlet and outlet check valves for the chamber. In two other arrangements, the pump chamber is formed by a piston and cylinder and the valve element is a separate member surrounding a cavity open to the pump chamber. A novel vent valve permits replacement air into the container on which the pump is used.

대표청구항 ▼

A dispenser pump comprising: a housing having wall means defining an internal cavity open on its upper end, means forming an inlet passage connecting the cavity to a container holding the product to be dispensed, and means forming an outlet passage connecting said cavity and an outlet nozzle; means

A dispenser pump comprising: a housing having wall means defining an internal cavity open on its upper end, means forming an inlet passage connecting the cavity to a container holding the product to be dispensed, and means forming an outlet passage connecting said cavity and an outlet nozzle; means defining a variable volume pump chamber open to said cavity; a cover plate closing the open upper end of said cavity having means cooperating with said housing to separate said inlet passage from said outlet passage; and a flexible valve element captured between said cover and said housing having an inlet portion sealing against said housing to close said inlet passage and an outlet portion sealing against said housing to close said outlet passage, said inlet portion permitting flow into said chamber but preventing flow out of said chamber, and said outlet portion permitting flow out of said chamber and preventing flow into said chamber.