초록 ▼

A liquid dispensing pump in the form of a trigger sprayer includes a thimble-shaped valving element containing inlet and outlet valves, and located within a cylindrical portion of the pump body. In one embodiment, a pressure accumulation chamber is defined between the pump body and the valving eleme

A liquid dispensing pump in the form of a trigger sprayer includes a thimble-shaped valving element containing inlet and outlet valves, and located within a cylindrical portion of the pump body. In one embodiment, a pressure accumulation chamber is defined between the pump body and the valving element, and a pump piston operates within the valving element and defines therewith a pump chamber in open communication with the accumulation chamber via spaced, flexible and extendable straps which interconnect the inlet and outlet valves for permitting a portion of the valving element to move axially into a discharge valve opening position. Vent valving is effected by either the pump piston or the valving element during inward reciprocation movement of the piston. In another embodiment, the sprayer is converted into a throttle pump by the provision of a pump piston which operates within the cylindrical portion of the pump body.

대표청구항 ▼

A liquid dispensing pump, comprising a pump body, a separate closure cap engaged with said pump body for mounting said pump body on a container of flowable product to be dispensed, said pump body including outwardly opening cylinder means having a bore of predetermined diameter and a counterbore of

A liquid dispensing pump, comprising a pump body, a separate closure cap engaged with said pump body for mounting said pump body on a container of flowable product to be dispensed, said pump body including outwardly opening cylinder means having a bore of predetermined diameter and a counterbore of relative greater diameter, said cylinder means being disposed at an angle to the central axis of said closure cap, a pump piston reciprocable in said cylinder means, said piston having piston seal means in sliding sealing engagement with the wall of said bore and defining together therewith a variable volume pump chamber, said pump body having inlet and outlet means for delivering product into and out of said pump chamber, means for manually reciprocating said piston, said cylinder means including a vent port establishing communication between the interior of said counterbore and the interior of the container, said piston having an annular seal means in sliding sealing engagement with the wall of said counterbore for sealing off said vent port from the atmosphere in a non-pumping position, and means at said wall of said counterbore for disengaging said annular seal means from said wall of said counterbore to thereby establish in a pumping position a vent passage for venting the container through said vent port, said annular seal means being located outwardly of said disengaging means in said non-pumping position.