US3874822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic plunger pump
Assignee: Individual
•
Filing: 1973-10-31
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Granted: 1975-04-01
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Expires: 1993-10-31
Abstract
Abstract An electromagnetic plunger valve which does not require an electromagnetic valve, and at the same time, which is low in cost, and in which the discharge passage is closed automatically as soon as the pump is stopped, and opened as soon as the pump is started, and the movable valve is actuated by the electromagnetic coil provided for the actuation of the electromagnetic plunger.
Inventors
- 👤 Tadashi Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:09
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/22; F04B49/24; F04B11/00; F04B11/0008; F04B11/0033; F04B17/00; F04B17/03; F04B17/04; F04B17/046
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
177 words
In a reciprocating electromagnetic pump including a cylinder, a magnetic piston having a flow-passage therethrough and having inlet and outlet ends and slidably mounted in the cylinder, said cylinder defining a pumping chamber surrounding the inlet end of said piston and receiving fluid therein, means for reciprocating the piston including an electromagnetic coil coaxial to said magnetic piston, a power source coupled to said electromagnetic piston for selective activation thereof, and a check valve mounted on the piston in the fluid flow-passage and including a fixed valve seat and a movable valve member of magnetic material cooperating with the seat to close said passage, said movable member being so positioned as to be drawn away from its seat by the attraction of the electromagnetic coil during operation of the pump to allow fluid flow, the improvements which comprise said check valve being mounted adjacent the outlet end of said piston flow-passage and said power source being half-wave rectified current, whereby the flow of fluid discharged from the pump is completely halted upon interruption of the power supply.
Claim 2
Dependent Claim
177 words
In a reciprocating electromagnetic pump including a cylinder, a magnetic piston having a flow-passage therethrough and having inlet and outlet ends and slidably mounted in the cylinder, said cylinder defining a pumping chamber surrounding the inlet end of said piston and receiving fluid therein, means for reciprocating the piston including an electromagnetic coil coaxial to said magnetic piston, a power source coupled to said electromagnetic piston for selective activation thereof, and a check valve mounted on the piston in the fluid flow-passage and including a fixed valve seat and a movable valve member of magnetic material cooperating with the seat to close said passage, said movable member being so positioned as to be drawn away from its seat by the attraction of the electromagnetic coil during operation of the pump to allow fluid flow, the improvements which comprise said check valve being mounted adjacent the outlet end of said piston flow-passage and said power source being half-wave rectified current, whereby the flow of fluid discharged from the pump is completely halted upon interruption of the power supply.
Claim 3
Dependent Claim
33 words
An electromagnetic plunger pump according to claim 1, in which an elastic member is attached to the movable valve where it comes in contact with the valve seat portion of the discharge passage.
Claim 4
Dependent Claim
23 words
An electromagnetic plunger pump according to claim 1, in which said movable valve is provided with holes for allowing fluid to pass through.
Claim 5
Dependent Claim
19 words
The improved reciprocating electromagnetic pump of claim 1, further comprising a relief valve means communicating with said pumping chamber.
Claim 6
Dependent Claim
127 words
The improved reciprocating electromagnetic pump of claim 4, further comprising a pump body having a passageway therein, one end of said passageway being a fluid inlet and an accumulator mounted at the other end thereof, a suction side check valve and a discharge side check valve positioned within said passageway and normally biased closed, said passageway communicating with said pumping chamber in the vicinity of said suction side check valve whereby the suction stroke of said piston opens said suction side check valve and draws fluid into said passageway, said fluid forcing open said discharge side valve chamber, said pumping chamber also communicating with said passageway in the region thereof betweEn said discharge side check valve and said accumulator, fluid being drawn into said pumping chamber therefrom.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |