Manually operated dispensing pump

Claim 2

A dispensing pump comprising, a pump body adapted for fluid tight communication with the opening of a container of flowable product to be dispensed, said pump body including a stationary upstanding piston, a container vent opening, and a collar surrounding said piston, an annular plunger mounted for reciprocation on said piston to define therewith a variable volume pump chamber, said piston having a valve controlled inlet passage, a plunger head slidably disposed on said plunger for reciprocation and having means defining a variable volume accumulation chamber in open communication with said pump chamber, means resiliently urging said plunger into a fully raised position above said pump body, said head having a discharge passage adapted to be opened and closed by said plunger upon movement in response to a change in pressure within said pump chamber, retention beads on said plunger head and on said collar for limiting said plunger head in a predetermined raised position wherein said plunger closes said discharge passage in said fully raised position thereof, said retention beads extending laterally respectively toward confronting surfaces of said collar and said plunger head, one of said beads defining a first annular bearing member in sliding engagement with one of said confronting surfaces during plunger head reciprocation, said pump body further including a vertical annular wall spaced from said piston and therewith defining a vent chamber which includes said vent opening, a vent skirt extending from said plunger head and having an annular vent seal defining a second bearing member slidably guided along said wall during said plunger head reciprocation, said vent chamber being adapted to be closed by said vent seal in said fully raised position of said plunger and to be opened by said vent seal during plunger reciprocation, and said bearing members being spaced apart acting to resist any lateral or eccentric forces applied to said head during its reciprocation to thereby isolate said forces from said plunger permitting it to respond without restraint during said movement in opening and closing said discharge passage.

Claim 3

The dispensing pump according to claim 1, wherein a plunger skirt extends from said head concentric with said vent skirt, said first and second bearing members being respectively located on said skirts.

Claim 4

The dispensing pump according to claim 1, wherein a plunger skirt extends from said head concentric with said vent skirt, said first and second bearing members being respectively located on said collar and said vent skirt.

Claim 5

The dispensing pump according to claim 1, wherein said plunger head includes a plunger skirt with said vent skirt extending therefrom, said first and second bearing members being respectively located on said skirts.

Claim 6

The dispensing pump according to claim 1, wherein said plunger head includes a plunger skirt with said vent skirt extending therefrom, said first and second bearing members being respectively located on said collar and said vent skirt.

Claim 7

The dispensing pump according to claim 1, wherein the upper end of said plunger has wall means thereon complementarily contoured to and facing the upper end of said piston, said wall means having at least one port therein for maintaining the open communication between said chamber, whereby said pump chamber may be effectively primed upon depressing said head, and whereby after pump priming, said contoured wall means bears against said upper end of said piston at the end of the plunger downstroke while said discharge passage remains open allowing for further depression of said head, so that said plunger head will continue to expel product through said discharge passage upon said further depression before said plunger moves into its discharge closing position.

Claim 8

A dispensing pump, comprising a pump body sealingly mounted on a container of flowable product to be dispensed, said body having a container vent opening therein and a stationary upstanding piston thereon, an annular plunger resiliently urged into a fully raised position and mounted for reciprocation on said piston to define therewith a variable volume pump chamber, a valve controlled inlet passage in said piston, a plunger head slidably disposed on said plunger for reciprocation and having means defining a variable volume accumulation chamber in open communication with said pump chamber, said head also having a discharge passage adapted to be opened and closed by said plunger upon movement in response to a change in pressure within said pump chamber, said pump body further including a vent chamber which includes said vent opening, and a vent skirt on said plunger adapted for closing said vent chamber in the raised position of said plunger and for opening said vent chamber during an initial and further downstroke position of said plunger, perforate wall means at an upper end of said plunger confronting the upper end of said piston and being complementarily contoured thereto, whereby said pump chamber may be effectively primed upon depressing said head, and whereby, after pump priming, said wall means bears against said upper end of said piston at the end of the plunger downstroke while said discharge passage remains open allowing for further depression of said head, so that said plunger head will continue to expel product through said discharge passage upon said further depression before said plunger moves into its discharge closing position.

Claim 9

A dispensing pump, comprising a pump body sealingly mounted on a container of flowable product to be dispensed, said body having a container vent opening therein and a stationary upstanding piston thereon, an annular plunger resiliently urged into a fully raised position and mounted for reciprocation on said piston to define therewith a variable volume pump chamber, a valve controlled inlet passage in said piston, a plunger head slidably disposed on said plunger for reciprocation and having means defining a variable volume accumulation chamber in open communication with said pump chamber, said head also having a discharge passage adapted to be opened and closed by said plunger upon movement in response to a change in pressure within said pump chamber, said pump body further including a vent chamber which includes said vent opening, and a vent skirt on said plunger adapted for closing said vent chamber in the raised position of said plunger and for opening said vent chamber during an initial and further downstroke position of said plunger, perforate wall means at an upper end of said plunger confronting the upper end of said piston and being complementarily contoured thereto, whereby said pump chamber may be effectively primed upon depressing said head, and whereby, after pump priming, said wall means bears against said upper end of said piston at the end of the plunger downstroke while said discharge passage remains open allowing for further depression of said head, so that said plunger head will continue to expel product through said discharge passage upon said further depression before said plunger moves into its discharge closing position.

Claim 10

The dispensing pump according to claim 6, wherein said wall means comprises a cover wall slightly spaced from the undersurface of said head in said discharge closing position of said plunger.

Claim 11

The dispensing pump according to claim 7, wherein said wall means comprises a cover wall slightly spaced from the undersurface of said head in said discharge closing position of said plunger, said cover wall having ports therein for maintaining the open communication between said chamber.

Claim 12

A dispensing pump of the pressure accumulating type comprising, a pump body adapted to be secured in a fluid tight manner over the opening of a container of product to be dispensed, said pump body having a container vent opening therein and a stationary upstanding piston thereon, an annular plunger resiliently urged into a fully raised position above said body and being mounted for reciprocation on said piston to define therewith a variable volume pump chamber, a valve controlled inlet passage in said piston, a plunger head having a downwardly directed blind socket slidably disposed on said plunger and therewith defining a variable volume accumulation chamber between said plunger and the blind end of said socket, and being in open communication with said pump chamber, said plunger head having a discharge passage adapted to be opened and closed by relative movement between said plunger and said plunger head, means for limiting the upward movement of said plunger head at a predetermined position in which said plunger is urged at said fully raised position thereof into said socket to function as a valve for closing said passage, wall means at the upper end of said plunger defining a contoured surface facing the upper end of said piston, said wall means having at least one port therein for maintaining the open communication between said chambers, said upper end of said piston being complementarily contoured, whereby said pump chamber may be effectively primed upon depressing said head, and whereby, after pump priming, said contoured surface bears against said upper end of said piston at the end of the plunger downstroke while said discharge passage remains open thereby allowing for further depression of said head which continues to expel product through said discharge passage from said accumulation chamber before said plunger is urged into said socket for closing said passage.

Claim 13

A dispensing pump of the pressure accumulating type comprising, a pump body adapted to be secured in a fluid tight manner over the opening of a container of product to be dispensed, said pump body having a container vent opening therein and a stationary upstanding piston thereon, an annular plunger resiliently urged into a fully raised position above said body and being mounted for reciprocation on said piston to define therewith a variable volume pump chamber, a valve controlled inlet passage in said piston, a plunger head having a downwardly directed blind socket slidably disposed on said plunger and therewith defining a variable volume accumulation chamber between said plunger and the blind end of said socket, and being in open communication with said pump chamber, said plunger head having a discharge passage adapted to be opened and closed by relative movement between said plunger and said plunger head, means for limiting the upward movement of said plunger head at a predetermined position in which said plunger is urged at said fully raised position thereof into said socket to function as a valve for closing said passage, wall means at the upper end of said plunger defining a contoured surface facing the upper end of said piston, said wall means having at least one port therein for maintaining the open communication between said chambers, said upper end of said piston being complementarily contoured, whereby said pump chamber may be effectively primed upon depressing said head, and whereby, after pump priming, said contoured surface bears against said upper end of said piston at the end of the plunger downstroke while said discharge passage remains open thereby allowing for further depression of said head which continues to expel product through said discharge passage from said accumulation chamber before said plunger is urged into said socket for closing said passage.

Claim 14

The dispensing pump according to claim 10, wherein said wall means defining said contoured surface comprises a cover wall spaced a slight distance from the undersurface of said plunger head in said predetermined position of said plunger.

Claim 15

A dispensing pump of the pressure accumulating type comprising, a pump body adapted to be sealingly mounted on a container of flowable product to be dispensed, said body having a container vent opening therein and a stationary upstanding piston thereon, an annular plunger resiliently urged into a fully raised position above said pump body and being mounted for reciprocation on said piston to define therewith a variable volume pump chamber, a valve controlled inlet passage in said piston, a plunger head having a downwardly directed blind socket slidably disposed on said plunger and therewith defining a variable volume accumulation chamber between said plunger and the blind end of said socket, and being in open communication with said pump chamber, said plunger head having a discharge passage adapted to be opened and closed by relative movement between said plunger and said plunger head, a collar on said pump body for guiding said plunger head during reciprocation, means on said plunger head and said collar for limiting the upward movement of said plunger head at a predetermined position in which said plunger is urged at said fully raised position thereof into said socket to function as a valve for closing said passage, means on said pump body defining a container vent chamber for establishing communication between the outside of said pump body and the interior of the container via said vent opening, said means comprising an annular wall spaced from and surrounding said piston, a vent skirt extending from said plunger head and having an annular vent seal in engagement with an inner surface of said annular wall for further guiding said plunger head during reciprocation and for closing said vent chamber while said plunger is in said fully raised position and during an initial downstroke reciprocation thereof, said vent skirt adapted to open said vent chamber upon a further downstroke reciprocation of said plunger, said annular wall and one of said collar and said plunger head serving to guide said plunger head along an axis concentric with the central axis of said pump body during plunger head reciprocation for thereby isolating said plunger against any lateral or eccentric outside forces acting on said plunger head whereby said plunger floats freely during its reciprocation without hindrance from said outside forces.

Claim 16

A dispensing pump of the pressure accumulating type comprising, a pump body adapted to be sealingly mounted on a container of flowable product to be dispensed, said body having a container vent opening therein and a stationary upstanding piston thereon, an annular plunger resiliently urged into a fully raised position above said pump body and being mounted for reciprocation on said piston to define therewith a variable volume pump chamber, a valve controlled inlet passage in said piston, a plunger head having a downwardly directed blind socket slidably disposed on said plunger and therewith defining a variable volume accumulation chamber between said plunger and the blind end of said socket, and being in open communication with said pump chamber, said plunger head having a discharge passage adapted to be opened and closed by relative movement between said plunger and said plunger head, a collar on said pump body for guiding said plunger head during reciprocation, means on said plunger head and said collar for limiting the upward movement of said plunger head at a predetermined position in which said plunger is urged at said fully raised position thereof into said socket to function as a valve for closing said passage, means on said pump body defining a container vent chamber for establishing communication between the outside of said pump body and the interior of the container via said vent opening, said means comprising an annular wall spaced from and surrounding said piston, a vent skirt extending from said plunger head and having an annular vent seal in engagement with an inner surface of said annular wall for further guiding said plunger head during reciprocation and for closing said vent chamber while said plunger is in said fully raised position and during an initial downstroke reciprocation thereof, said vent skirt adapted to open said vent chamber upon a further downstroke reciprocation of said plunger, said annular wall and one of said collar and said plunger head serving to guide said plunger head along an axis concentric with the central axis of said pump body during plunger head reciprocation for thereby isolating said plunger against any lateral or eccentric outside forces acting on said plunger head whereby said plunger floats freely during its reciprocation without hindrance from said outside forces.

Claim 17

The dispensing pump according to claim 12, wherein said limiting means are axially spaced from said vent seal.

Claim 18

The dispensing pump according to claim 12, wherein the upper end of said plunger terminates in wall means defining a contoured surface facing the upper end of said piston, said wall means having ports therein maintaining the open communication between said pump and accumulation chambers, the upper end of said piston being complementarily contoured, whereby said pump chamber may be effectively primed upon depressing said head, and whereby, after pump priming, said contoured surface abuts against said upper end of said piston at the end of the plunger downstroke while said discharge passage remains open thereby allowing for further depression of said head which continues to expel product through said discharge passage before said plunger is urged into said socket for closing said passage.

Claim 19

The dispensing pump according to claim 14, wherein said wall means defining said contoured surface comprises a cover wall having a outer surface spaced slightly way from the undersurface of said plunger head in said predetermined position of said plunger.