US4458487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic actuator
Assignee: Azbil Corp
•
Filing: 1981-10-31
•
Granted: 1984-07-10
•
Expires: 2001-10-31
Abstract
Abstract An electromagnetic actuator utilizing a fluid pressure obtained from an electromagnetic pump, wherein according to the present invention, there is provided a responsive member displaceable in response to the pressure of a fluid forced into a second chamber from a first chamber. The responsive member displaceable as described can operate a valve member or the like coupled thereto in an on-off control or a proportional control with a large stroke in a reliable manner.
Inventors
- 👤 Tadashi Kojima
- 👤 Tetsuo Uchihama
- 👤 Kazuyoshi Tanaka
- 👤 Eiichi Morozumi
- 👤 Kentaro Inoue
- 👤 Hitoshi Tanaka
- 👤 Shyuji Morio
- 👤 Shunji Ichida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:47
CPC Classifications
F; F04; F04B; F04B17/00; F04B17/03; F04B17/04; F04B17/046; F23; F23N; F23N1/00; F23N1/005; F23N2227/00; F23N2227/04; F23N2227/36; F23N2229/00; F23N2235/00; F23N2235/12; F23N2235/24
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
92 words
An electromagnetic actuator comprising: an electromagnetic pump for continuously supplying a fluid from a first chamber to a second chamber in accordance with an output of a driving device; a passage interconnecting said first and second chambers; a responsive load means comprising a responsive member responsive to a pressure in said second chamber and a load driven by said responsive member, and operable for controlling the mechanical displacement of said load; and a flow-rate control means provided in said passage for maintaining the pressure in said second chamber at a determined value.
Claim 2
Dependent Claim
92 words
An electromagnetic actuator comprising: an electromagnetic pump for continuously supplying a fluid from a first chamber to a second chamber in accordance with an output of a driving device; a passage interconnecting said first and second chambers; a responsive load means comprising a responsive member responsive to a pressure in said second chamber and a load driven by said responsive member, and operable for controlling the mechanical displacement of said load; and a flow-rate control means provided in said passage for maintaining the pressure in said second chamber at a determined value.
Claim 3
Dependent Claim
17 words
An electromagnetic actuator as set forth in claim 1 wherein said flow-rate control means is an orifice.
Claim 4
Dependent Claim
35 words
An electromagnetic actuator as set forth in claim 2 wherein said responsive load means comprises said responsive member and a slidable rod mechanically linked thereto, and said responsive member is made of a flexible material.
Claim 5
Dependent Claim
76 words
An electromagnetic actuator as set forth in claim 3 wherein said driving device comprises a control circuit which generates an output pulse current and varies effective value of said pulse current for controlling the delivery of said electromagnetic pump, and a feed-back circuit which detects said current flowing through the electromagnetic winding of said pump and feeds it back to said control circuit in a direction maintaining said delivery of said pump at a constant value.
Claim 6
Dependent Claim
37 words
An electromagnetic actuator as set forth in claim 4 wherein said output pulse current obtained from said control circuit is a controlling output for controlling said slidable rod in a two-position control or a proportional control manner.
Claim 7
Dependent Claim
26 words
An electromagnetic actuator as set forth in claim 5 wherein said load is a valve device or a damper for controlling flow rate of a fluid.
Claim 8
Dependent Claim
140 words
An electromagnetic actuator comprising: an electromagnetic pump for continuously forcing a fluid through a first passage from a first chamber to a second chamber under operation of a plunger and a check valve reciprocable at a frequency corresponding to that of a driving signal supplied to an exciting coil of said pump; a second passage provided in said electromagnetic pump for by-passing said check valve so as to interconnect said first and second chambers; a movable member which closes said second passage under a magnetic force of said exciting coil when a driving signal is applied to said exciting coil, and thereby elevates the pressure in said second chamber; a responsive member displaced in response to the pressure in said second chamber; and a responsive load means including a coupling member for mechanically coupling said responsive member to a load.
Claim 9
Dependent Claim
140 words
An electromagnetic actuator comprising: an electromagnetic pump for continuously forcing a fluid through a first passage from a first chamber to a second chamber under operation of a plunger and a check valve reciprocable at a frequency corresponding to that of a driving signal supplied to an exciting coil of said pump; a second passage provided in said electromagnetic pump for by-passing said check valve so as to interconnect said first and second chambers; a movable member which closes said second passage under a magnetic force of said exciting coil when a driving signal is applied to said exciting coil, and thereby elevates the pressure in said second chamber; a responsive member displaced in response to the pressure in said second chamber; and a responsive load means including a coupling member for mechanically coupling said responsive member to a load.
References Cited (Backward Citations)
US3118383A
Cited
US1346898A
Cited
GB1049314A
Cited
US3415487A
Cited
US3516332A
Cited
US3842601A
Cited
US3871176A
Cited
GB1474758A
Cited
US4241644A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-10 | 1988-01-09 | 1988-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-10 | 1992-01-09 | 1992-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-10 | 1996-01-09 | 1996-07-10 | $7700.00 | Window Closed / Lapsed |