초록 ▼

A dispensing pump is adapted for pressure filling and includes a fluid filling passage which remains sealingly closed during pumping operation by the provision of an annular valve skirt in sealing engagement with a wall of the fluid filling passage, such skirt inwardly flexing during charging the co

A dispensing pump is adapted for pressure filling and includes a fluid filling passage which remains sealingly closed during pumping operation by the provision of an annular valve skirt in sealing engagement with a wall of the fluid filling passage, such skirt inwardly flexing during charging the container permitting the charged fluids to by-pass the valve and enter the container. The valve skirt depends from either the plunger head or from the plunger. When depending from the plunger, the valve skirt functions as a guide element for the plunger head together with a plunger head retention bead which cooperates with a pump body retention bead in limiting the upward movement of the plunger head to a predetermined extent. These guide members serve to isolate the plunger against the influence of lateral or eccentric forces applied against the plunger head during its reciprocation. And, the plunger may be capped with a wall surface defining a complementary contour to that of the upper end of the piston which it faces to facilitate expelling of product from the accumulation chamber after the end of the plunger downstroke as this surface first bottoms against the upper end of the piston.

대표청구항 ▼

A dispensing pump of the pressure accumulating type, comprising a pump body having an upstanding stationary piston, said body being adapted for securement in a fluid tight manner on a container of product to be dispensed, reciprocable plunger means comprising an annular plunger resiliently urged int

A dispensing pump of the pressure accumulating type, comprising a pump body having an upstanding stationary piston, said body being adapted for securement in a fluid tight manner on a container of product to be dispensed, reciprocable plunger means comprising an annular plunger resiliently urged into a fully raised position above said pump body and being mounted on said piston for reciprocation to define therewith a variable volume pump chamber, a valve controlled inlet passage in said piston, said plunger means further comprising a plunger head slideably disposed on said plunger for reciprocation and having means defining a variable volume accumulation chamber in open communication with said pump chamber, said head having a discharge passage adapted to be opened and closed upon relative movement by said plunger in response to a change in pressure within said pump chamber, means for limiting upward movement of said plunger head at a predetermined position wherein said plunger in said fully raised position functions as a valve for closing said passage, said body including a refill opening and an annular wall surrounding said piston and therewith defining together with said opening a refill passage for pressurized product, a skirt depending from said plunger means for reciprocation together therewith, said skirt having an annular resilient lip seal thereon in sealing engagement with an inner surface of said wall for closing said passage and for guiding said plunger means during reciprocation thereof, said lip seal being deflectable away from said inner surface for thereby opening said passage in response to a charge of pressurized product applied to the outer surface of said lip seal during a charge operation.