US3705370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetically actuated and restored print hammer
Assignee: International Business Machines Corp
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Filing: 1971-04-15
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Granted: 1972-12-05
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Expires: 1991-04-15
Abstract
Abstract A magnetic actuator comprises a three-legged magnetic core with an armature pivotally mounted at the middle leg to have portions on either side thereof with an abutting gap relation with one outer leg and an abutting plus a peripheral gap relation with the other. A winding on the one abutting leg provides drive flux, and a winding or permanent magnet on the other leg provides a restore or detent flux between teeth on the armature and core.
Inventors
- 👤 Hi D Chai
- 👤 Stephen H Mills
- 👤 Joseph P Pawletko
- 👤 Francis E Peters
- 👤 Carl T Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:47
CPC Classifications
H; H02; H02K; H02K33/00; B; B41; B41J; B41J9/00; B41J9/26; B41J9/38; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/14
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
203 words
In an electromagnetic actuator, having a cylindrical surface portion at the end of the middle leg, a three-legged magnetic core member having a cylindrical surface portion at the end of the middle leg, an armature of magnetic material having a pivotal support adjacent the middle leg of said core member with a corresponding cylindrical surface portion concentric with said pivotal support and positioned in close relation with the cylindrical surface portion of said middle leg to provide a constant reluctance pin gap, said armature having portions extending on opposite sides of said pivotal support point positioned in spaced relation with the ends of the outer legs of said core member with one of said portions extending beyond the end of one of said outer legs to provide an actuating arm, means for producing a restore magnetic flux in said one outer leg to hold said armature against the end of said one outer leg, and an operating winding positioned on said other outer leg disposed to be energized to overcome the effects of the means producing said restore magnetic flux, whereby the armature is actuated to separate said armature from said one associated outer leg of said core member and operate said arm.
Claim 2
Dependent Claim
203 words
In an electromagnetic actuator, having a cylindrical surface portion at the end of the middle leg, a three-legged magnetic core member having a cylindrical surface portion at the end of the middle leg, an armature of magnetic material having a pivotal support adjacent the middle leg of said core member with a corresponding cylindrical surface portion concentric with said pivotal support and positioned in close relation with the cylindrical surface portion of said middle leg to provide a constant reluctance pin gap, said armature having portions extending on opposite sides of said pivotal support point positioned in spaced relation with the ends of the outer legs of said core member with one of said portions extending beyond the end of one of said outer legs to provide an actuating arm, means for producing a restore magnetic flux in said one outer leg to hold said armature against the end of said one outer leg, and an operating winding positioned on said other outer leg disposed to be energized to overcome the effects of the means producing said restore magnetic flux, whereby the armature is actuated to separate said armature from said one associated outer leg of said core member and operate said arm.
Claim 3
Dependent Claim
58 words
The invention as defined in claim 1 characterized by said armature having a peripheral curved surface portion defined by a plurality of spaced tooth portions adjacent said one outer leg, and said one outer leg having corresponding tooth portions which are displaced peripherally of the armature tooth portions when the armature is rotated away from said outer leg.
Claim 4
Dependent Claim
31 words
The invention as defined in claim 2 characterized by said middle leg and said other outer leg being separated by a narrow slot which receives a portion of said operating winding.
Claim 5
Dependent Claim
53 words
The invention as defined in claim 3 characterized by said middle leg having a substantially radially disposed flat pole face adjacent said cylindrical surface portion on the side of said pivotal support adjacent said other outer leg and said armature having a corresponding pole face disposed to abut therewith in the operated position.
Claim 6
Dependent Claim
28 words
The invention as defined in claim 1 characterized by said one leg comprising a permanent magnet having a pole piece with adjacent abutting and toothed peripheral pole faces.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |