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US 5,401,148 AGranted
Manually operated reciprocating liquid pump
AssigneeContico International, Inc.
InventorsDonald D. Foster, Philip L. Nelson
Life of this patent
Estimating the term…
Abstract
A manually operated reciprocating liquid pump employs both a priming valve and a check valve where the priming valve performs the dual functions of priming the pump and sealing the pump to prevent inadvertent leakage of liquid through the pump when it is not in an upright orientation.
Claims20
A manually operated reciprocating liquid pump comprising:
- a pump housing having a tubular configuration with an axial interior bore extending through the pump housing;
- a plunger having a tubular configuration with an axial interior bore extending through the plunger, the plunger extending axially downwardly into the interior bore of the pump housing;
- a piston on the plunger and received in the pump housing interior bore for axially reciprocating stroke movements of the piston therein between a bottom stroke position and an upwardly spaced top stroke position of the piston in the pump housing interior bore;
- and,
- a valve element mounted on the plunger inside the plunger interior bore for movement of the valve element with the plunger, the valve element is configured so that the valve element will seat with and seal closed the pump housing interior bore when the piston is in the bottom stroke position, and the valve element will unseat and separate from the pump housing interior bore when the piston stroke moves the piston upwardly from the bottom stroke position toward the top stroke position.
2 more elements
A manually operated reciprocating liquid pump comprising:
- a pump housing having a tubular configuration with an axial interior bore extending through the pump housing;
- a plunger having a tubular configuration with an axial interior bore extending through the plunger, the plunger extending axially downwardly into the pump housing interior bore;
- a piston on the plunger and received in the pump housing interior bore for axially reciprocating stroke movements of the piston therein between a bottom stroke position and an upwardly spaced top stroke position of the piston in the pump housing interior bore;
- a valve element mounted on the plunger inside the plunger interior bore for movement with the plunger, the valve element is configured so that the valve element will seat with and seal closed the pump housing interior bore when the piston is in the bottom stroke position, and the valve element will unseat from and open the pump housing interior bore when the piston stroke moves the piston upwardly from the bottom stroke position toward the top stroke position;
- and,
- a check valve positioned in the pump housing interior bore separated from the valve element.
3 more elements
A manually operated liquid pump comprising:
- a pump housing having a tubular configuration with an axial interior bore extending through the pump housing;
- a plunger having a tubular configuration with an axial interior bore extending through the plunger, the plunger extending axially downwardly into the pump housing interior bore;
- a piston on the plunger and received in the pump housing interior bore for axially reciprocating stroke movements of the piston therein between a bottom stroke position and an upwardly spaced top stroke position of the piston in the pump housing interior bore;
- a valve element mounted on the plunger inside the plunger interior bore for movement with the plunger, the valve element having an axial length with a notch formed in the valve element intermediate its axial length;
- a rim on the plunger extending into the plunger interior bore and into the valve element notch thereby mounting the valve element on the plunger, the projection being configured to push the valve element downwardly when the piston stroke movement is toward the bottom stroke position and to push the valve element upwardly when the piston stroke movement is toward the top stroke position;
- and,
- a check valve positioned in the pump housing interior bore separately from and spaced entirely axially below the valve element.
4 more elements
Dependencies are inferred from the claim text.