US3787791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solenoid for wire printer
Assignee: BARCLAYSAMERICAN/BUSINESS CREDIT INC 530 NORTH WATER STMILWAUKEE WS A CORP OF CT
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Filing: 1972-10-30
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Granted: 1974-01-22
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Expires: 1992-10-30
Abstract
Abstract Solenoid for longitudinally actuating printing wire in high speed wire printer comprising metal housing open at one end, a coil in the housing, an annular pole piece substantially closing open end of housing to eliminate air gap in flux path, a plunger secured to print wire by swaging to avoid degrading its magnetic characteristics and movable within and axially of coil and pole piece, a flat tempered steel spring engaging plunger to retain same in inactive position and to return it thereto following energization of the coil, a plastic spring seat formed as a ring mounted in open end of housing with recesses receiving ends of spring, and a plastic cap mounted over open end of housing in snap-fit engagement therewith, the cap and housing having axial bores to accommodate printing wire, with an enlarged outer portion of housing bore receiving a plastic bearing and the end of a plastic tube slidably encasing a major portion of the wire.
Inventors
- 👤 J Borger
- 👤 R Castellanos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:04
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/06; H01F7/08; H01F7/16; H01F7/1607; B; B41; B41J; B41J2/00; B41J2/22; B41J2/23; B41J2/27; B41J2/285; B41J9/00; B41J9/26; B41J9/38; H01F7/13
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
131 words
A solenoid for longitudinally actuating a printing wire in a high speed wire printer, comprising a metal housing open at one end, a coil mounted in said housing, an annular pole piece substantially closing said open end of said housing, a cylindrical plunger having a through axial bore for receiving and secured to the printing wire and movable within and axially of said coil and pole piece, a flat and substantially diamond-shaped spring engaging said plunger to retain the same in inactive position and to return it thereto following energization of said coil to move said plunger to operated position and deenergization of said coil, and a plastic cap removably mounted over the open end of said housing to limit movement of said plunger by said spring relative to said housing.
Claim 2
Dependent Claim
131 words
A solenoid for longitudinally actuating a printing wire in a high speed wire printer, comprising a metal housing open at one end, a coil mounted in said housing, an annular pole piece substantially closing said open end of said housing, a cylindrical plunger having a through axial bore for receiving and secured to the printing wire and movable within and axially of said coil and pole piece, a flat and substantially diamond-shaped spring engaging said plunger to retain the same in inactive position and to return it thereto following energization of said coil to move said plunger to operated position and deenergization of said coil, and a plastic cap removably mounted over the open end of said housing to limit movement of said plunger by said spring relative to said housing.
Claim 3
Dependent Claim
23 words
A solenoid according to claim 1, wherein said plunger is secured to said wire by peripheral swaging to avoid degrading its magnetic characteristics.
Claim 4
Dependent Claim
63 words
In a solenoid according to claim 2, wherein said housing has a hub with a stepped axial bore having an enlarged outer portion and a reduced inner portion receiving said printing wire, a plastic tube slidably encasing a major portion of said wire with one end thereof disposed in said enlarged outer portion of said housing bore as a bearing for said wire.
Claim 5
Dependent Claim
30 words
In a solenoid according to claim 3, a plastic ring in the inner end of said enlarged outer portion of said housing bore as an auxiliary bearing for said wire.
Claim 6
Dependent Claim
27 words
A solenoid according to claim 2, wherein said plastic cap has an axial bore for receiving an end portion of said wire and guiding longitudinal movements thereof.
Claim 7
Dependent Claim
31 words
In a solenoid according to claim 1, a plastic seat for the ends of said spring engaging said pole piece and said housing and held in the latter by said cap.
Claim 8
Dependent Claim
34 words
A solenoid according to claim 1, wherein said spring comprises a flat piece of tempered steel centrally apertured to receive said plunger, and said plunger has an enlarged end flange engaged by said spring.
Claim 9
Dependent Claim
28 words
In a solenoid according to claim 7, a spring seat for engaging the ends of said spring, comprisiNg a plastic ring interposed between said housing and said cap.
Claim 10
Dependent Claim
42 words
A solenoid according to claim 8, wherein said ring is formed with diametrically opposed recesses in its outer face receiving the ends of said spring and having inner surfaces sloping centrally inwardly to accommodate inward flexing of said spring by said plunger.
Claim 11
Dependent Claim
58 words
A solenoid according to claim 1, wherein said coil comprises a plastic bobbin having a rear flange with rearwardly extending protuberances adapted to be compressed by said pole piece during insertion of the latter into said metal housing, whereby said pole piece functions as a coil retainer to prevent axial movement of said coil relative to said housing.
Claim 12
Dependent Claim
46 words
A solenoid according to claim 1, wherein the outer surface of said housing has a peripheral groove, and the inner end of said cap comprises axially extending arms with inturned noses seating in said groove to effect a snap-fit engagement of said cap on said housing.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |