US3592565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Armature pump
Assignee: Eberspaecher Climate Control Systems GmbH and Co KG
•
Filing: 1969-07-08
•
Granted: 1971-07-13
•
Expires: 1989-07-08
Abstract
Abstract An oscillating armature pump comprises a reciprocable armature piston having a pumping passage defined therethrough with a valve seat. The pump includes a housing having an inlet with an inlet valve seat which is closed by a suction valve member having a stem which extends through the piston opening and holds a piston valve off the seat of the piston opening in the inoperative position of the pump piston. The pump piston advantageously includes an extension through which it transmits a closing force to the suction valve in the inoperative position of the piston as a result of the biasing action of the main pump spring. The valve stem extension of the suction valve itself, also acts on the piston valve to maintain it off its seat by a small gap in the inoperative position. The piston valve is advantageously acted upon by the combined force of a pump spring and a pressure valve spring which is confined within a cage which is under biasing contact by the pump spring. The piston has a sleeve portion which is adapted to engage with the outlet member of the housing to limit the pump stroke.
Inventors
- 👤 Siegfried Kofink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:48
CPC Classifications
F; F04; F04B; F04B17/00; F04B17/03; F04B17/04; F04B17/046; F04B53/00; F04B53/10; F04B53/102; F04B53/12; F04B53/125; F04B53/129
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
146 words
A reciprocatable armature pump, comprising a pump housing having an inlet fitting with an inlet passage terminating inside said housing in an inlet valve seat, an inlet valve adapted to close said inlet valve seat, said housing having an outlet fitting with an outlet passage at the opposite end of said housing from said inlet fitting, an armature piston displaceable in said housing located between said inlet and outlet fittings and having a pump passage therethrough, electromagnetic coil means for displacing said piston, a piston valve adapted to close the pump passage, and spring means urging said piston toward said inlet valve and closing said inlet valve in the inoperative position, said inlet valve having stem means engageable with said piston valve to lift said piston valve off its associated seat closing to open said pump passage when said inlet valve is in an inoperative position.
Claim 2
Dependent Claim
146 words
A reciprocatable armature pump, comprising a pump housing having an inlet fitting with an inlet passage terminating inside said housing in an inlet valve seat, an inlet valve adapted to close said inlet valve seat, said housing having an outlet fitting with an outlet passage at the opposite end of said housing from said inlet fitting, an armature piston displaceable in said housing located between said inlet and outlet fittings and having a pump passage therethrough, electromagnetic coil means for displacing said piston, a piston valve adapted to close the pump passage, and spring means urging said piston toward said inlet valve and closing said inlet valve in the inoperative position, said inlet valve having stem means engageable with said piston valve to lift said piston valve off its associated seat closing to open said pump passage when said inlet valve is in an inoperative position.
Claim 3
Dependent Claim
44 words
A reciprocatable armature pump, according to claim 1, wherein said spring means includes a pump spring and a closing spring disposed between said inlet fitting and said piston valve and establishing a force-transmitting connection between said valve seat and said inlet valve stem means.
Claim 4
Dependent Claim
41 words
A reciprocatable armature pump, according to claim 1, wherein said inlet fitting includes an extension portion, said piston having a wall engageable with said extension portion at the end of the piston stroke and defining a stroke limit for said piston.
Claim 5
Dependent Claim
138 words
A reciprocatable armature pump, comprising a pump housing having an inlet fitting with an inlet passage terminating inside said housing in an inlet valve seat, an inlet valve adapted to close said inlet valve seat, said housing having an outlet fitting with an outlet passage at the opposite end of said housing from said inlet fitting, an armature piston displaceable in said housing located between said inlet and outlet fittings and having a pump passage therethrough, electromagnetic coil means for displacing said piston, a piston valve adapted to close the pump passage, and spring means urging said piston toward said inlet valve and closing said inlet valve in the inoperative position, said piston having a rigid extension which is in direct contact force-transmitting engagement with said inlet valve in an inoperative position and holds said inlet valve closed.
Claim 6
Dependent Claim
138 words
A reciprocatable armature pump, comprising a pump housing having an inlet fitting with an inlet passage terminating inside said housing in an inlet valve seat, an inlet valve adapted to close said inlet valve seat, said housing having an outlet fitting with an outlet passage at the opposite end of said housing from said inlet fitting, an armature piston displaceable in said housing located between said inlet and outlet fittings and having a pump passage therethrough, electromagnetic coil means for displacing said piston, a piston valve adapted to close the pump passage, and spring means urging said piston toward said inlet valve and closing said inlet valve in the inoperative position, said piston having a rigid extension which is in direct contact force-transmitting engagement with said inlet valve in an inoperative position and holds said inlet valve closed.
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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |