Manually operated fluid pump for dispensing lotion and the like
First Claim
1. A manually operated reciprocating fluid pump comprising:
- a pump housing having an inner surface and a pump chamber defined at least in part by the inner surface, said pump chamber extending axially through the pump housing;
a plunger configured for extending axially downwardly into the pump chamber of the pump housing, the plunger having a fluid passageway extending generally axially therethrough;
a piston on the plunger and slidable within the pump chamber, the piston being configured for sealing engagement with the inner surface of the pump housing all around the piston to seal against leakage of fluid between the inner surface of the pump housing and the piston, the piston being reciprocally and axially slidable within the pump chamber between a bottom stroke position and a top stroke position, the top stroke position being spaced axially above the bottom stroke position;
a priming valve mounted on the plunger radially inwardly of the piston for movement with the plunger, the priming valve being configured to be open and thereby permit fluid to flow upward through the pump chamber when the piston stroke moves the piston downward from the top stroke position toward the bottom stroke position, the priming valve being configured to be closed and thereby prevent fluid from flowing upward through the pump chamber when the piston stroke moves the piston upward from the bottom stroke position toward the top stroke position; and
a sealing plug moveable with the plunger, the sealing plug being configured to seat against and seal closed the pump chamber when the piston is in its bottom stroke position to prevent fluid from flowing upward through the pump chamber, the sealing plug being configured to be unseated from the pump chamber when the piston is positioned above its bottom stroke position;
the priming valve and sealing plug being mounted on the plunger in a manner to prevent axial movement of the priming valve and sealing plug relative to the plunger.
21 Assignments
0 Petitions
Accused Products
Abstract
A manually operated reciprocating fluid pump comprising a pump housing, a plunger, a piston and a priming valve. The pump housing has an inner surface and a pump chamber defined at least in part by the inner surface. The pump chamber extends axially through the pump housing. The plunger is extends axially downwardly into the pump chamber. The piston is on the plunger and is reciprocally and axially slidable within the pump chamber between a bottom stroke position and a top stroke position. The priming valve is mounted on the plunger radially inwardly of the piston for movement with the plunger. It is configured to be open and thereby permit fluid to flow upward through the pump chamber when the piston stroke moves the piston downward from the top stroke position toward the bottom stroke position and configured to be closed and thereby prevent fluid from flowing upward through the pump chamber when the piston stroke moves the piston upward. A sealing plug is moveable with the plunger and is configured to seat against and seal closed the pump chamber when the piston is in its bottom stroke position to prevent fluid from flowing upward through the pump chamber. It is configured to be unseated from the pump chamber when the piston is positioned above its bottom stroke position. The priming valve and sealing plug are mounted on the plunger in a manner to prevent axial movement of the priming valve and sealing plug relative to the plunger.
53 Citations
23 Claims
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1. A manually operated reciprocating fluid pump comprising:
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a pump housing having an inner surface and a pump chamber defined at least in part by the inner surface, said pump chamber extending axially through the pump housing; a plunger configured for extending axially downwardly into the pump chamber of the pump housing, the plunger having a fluid passageway extending generally axially therethrough; a piston on the plunger and slidable within the pump chamber, the piston being configured for sealing engagement with the inner surface of the pump housing all around the piston to seal against leakage of fluid between the inner surface of the pump housing and the piston, the piston being reciprocally and axially slidable within the pump chamber between a bottom stroke position and a top stroke position, the top stroke position being spaced axially above the bottom stroke position; a priming valve mounted on the plunger radially inwardly of the piston for movement with the plunger, the priming valve being configured to be open and thereby permit fluid to flow upward through the pump chamber when the piston stroke moves the piston downward from the top stroke position toward the bottom stroke position, the priming valve being configured to be closed and thereby prevent fluid from flowing upward through the pump chamber when the piston stroke moves the piston upward from the bottom stroke position toward the top stroke position; and a sealing plug moveable with the plunger, the sealing plug being configured to seat against and seal closed the pump chamber when the piston is in its bottom stroke position to prevent fluid from flowing upward through the pump chamber, the sealing plug being configured to be unseated from the pump chamber when the piston is positioned above its bottom stroke position; the priming valve and sealing plug being mounted on the plunger in a manner to prevent axial movement of the priming valve and sealing plug relative to the plunger. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A dispenser comprising:
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a pump housing having an inner surface, a pump chamber defined at least in part by the inner surface, an intake port adapted for fluid communication with a source of fluid, and an intake fluid flow path providing fluid communication between the intake port and pump chamber; a plunger configured for extending axially downwardly into the pump chamber of the pump housing, the plunger having a discharge fluid passageway extending generally axially therethrough and a downwardly extending protrusion; a piston on the plunger and slidable within the pump chamber, the piston being configured for sealing engagement with the inner surface of the pump housing all around the piston to seal against leakage of fluid between the inner surface of the pump housing and the piston, the piston being reciprocally and axially slidable within the pump chamber between a bottom stroke position and a top stroke position, the top stroke position being spaced axially above the bottom stroke position, the piston and pump chamber defining a variable volume fluid receiving cavity, the fluid receiving cavity having a first volume V1 when the piston is in its top stroke position and having a second volume V2 smaller than the first volume V1 when the piston is in its bottom stroke position; and a priming valve mounted on the plunger radially inwardly of the piston for movement with the plunger, the priming valve having a resilient tubular portion, the priming valve being moveable between a closed position in which the resilient tubular portion sealingly engages the protrusion all around the tubular portion to block fluid communication between the discharge fluid passageway of the plunger and the fluid receiving cavity and an open position in which at least a part of the tubular portion flexes generally radially outwardly away from the protrusion to thereby provide a gap between the tubular portion and protrusion for fluid communication between the fluid receiving cavity and the discharge fluid passageway of the plunger. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification