US3877840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic plunger pump
Assignee: Individual
•
Filing: 1973-10-31
•
Granted: 1975-04-15
•
Expires: 1993-10-31
Abstract
Abstract An electromagnetic plunger valve in which the pressure plunger is capable of moving smoothly in its cylinder, and the cylinder is allowed to shift in its position in the right and left direction, and said pump can be used satisfactorily even when the electromagnetic plunger and the pressure plunger are rigidly connected, and the lower spring that supports the electromagnetic plunger is supported by a cylinder.
Inventors
- 👤 Tadashi Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:15
CPC Classifications
F; F04; F04B; F04B17/00; F04B17/03; F04B17/04; F04B17/046; F04B11/00; F04B11/0008; F04B11/0033; F04B49/00; F04B49/22; F04B49/24; F04B53/00; F04B53/16; F04B53/162
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
225 words
In a reciprocating electromagnetic pump including a cylinder, an electromagnetic plunger having a flow-passage therethrough and defining upper and lower chambers in combination with said cylinder and slidably mounted in the cylinder, means for reciprocating the electromagnetic plunger including an electromagnetic coil coaxial to said electromagnetic plunger, a power source coupled to said electromagnetic plunger for selective activation thereof, a check valve operatively positioned 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, and a pressure plunger operatively coupled to said electromagnetic plunger, the improvements comprising said pressure plunger being rigidly coupled to said electromagnetic plunger, a hollow cylinder member positioned about said pressure plunger within said cylinder, said cylinder having an inwardly stepped portion in the vicinity of said cylinder member but spaced therefrom, an elastic member positioned on said stepped portion of said cylinder and supporting said cylinder member and a spring member operatively coupled to said electromagnetic plunger and to said cylinder member, whereby said cylinder member can shift radially of said electromagnetic plunger such that friction between the plunger and the cylinder is eliminated.
Claim 2
Dependent Claim
225 words
In a reciprocating electromagnetic pump including a cylinder, an electromagnetic plunger having a flow-passage therethrough and defining upper and lower chambers in combination with said cylinder and slidably mounted in the cylinder, means for reciprocating the electromagnetic plunger including an electromagnetic coil coaxial to said electromagnetic plunger, a power source coupled to said electromagnetic plunger for selective activation thereof, a check valve operatively positioned 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, and a pressure plunger operatively coupled to said electromagnetic plunger, the improvements comprising said pressure plunger being rigidly coupled to said electromagnetic plunger, a hollow cylinder member positioned about said pressure plunger within said cylinder, said cylinder having an inwardly stepped portion in the vicinity of said cylinder member but spaced therefrom, an elastic member positioned on said stepped portion of said cylinder and supporting said cylinder member and a spring member operatively coupled to said electromagnetic plunger and to said cylinder member, whereby said cylinder member can shift radially of said electromagnetic plunger such that friction between the plunger and the cylinder is eliminated.
Claim 3
Dependent Claim
25 words
An electromagnetic plunger pump according to claim 1, in which said cylinder member forms a spring seat portion on which to support the spring member.
Claim 4
Dependent Claim
19 words
The improved reciprocating electromagnetic pump of claim 1 further comprising a relief valve means communicating with said lower chamber.
Claim 5
Dependent Claim
130 words
The improved reciprocating electromagnetic pump of claim 3 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 lower chamber in the vicinity of said suction side check valve, whereby the suction stroke of said pressure plunger opens said suction side check valve and draws fluid into said passageway, said fluid forcing open said discharge side of said check valve, said lower chamber also communicating with said passageway in the region thereof between said discharge side check valve and said accumulator, fluid being drawn into said lower 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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |