US3804044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewing machine handwheel elimination arrangement
Assignee: Singer Co
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Filing: 1972-10-13
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Granted: 1974-04-16
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Expires: 1992-10-13
Abstract
Abstract A sewing machine is provided with means whereby the mechanisms thereof can be selectively operated in a normally forward direction or in a reverse direction such that the conventional handwheel on the sewing machine can be eliminated.
Inventors
- 👤 L Goetz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:59
CPC Classifications
D; D05; D05B; D05B69/00; D05B69/14; D05B69/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
129 words
In a sewing machine having stitch forming instrumentalities and work feeding mechanism, a mainshaft operatively connected to said stitch forming instrumentalities and work feeding mechanism, an electric motor connected to drive said mainshaft, a main circuit for supplying electrical pOwer to said electric motor and including an operator influenced speed control means, characterized by means substituted in place of the handwheel which is conventionally associated with a sewing machine mainshaft, said means comprising an auxiliary circuit for supplying electrical power to said electric motor and including a predetermined slow speed control means, operator accessible switch means for selectively connecting said electric motor to said main or to said auxiliary circuit and for influencing the internal wiring of said electric motor selectively to control the direction of electric motor rotation.
Claim 2
Dependent Claim
129 words
In a sewing machine having stitch forming instrumentalities and work feeding mechanism, a mainshaft operatively connected to said stitch forming instrumentalities and work feeding mechanism, an electric motor connected to drive said mainshaft, a main circuit for supplying electrical pOwer to said electric motor and including an operator influenced speed control means, characterized by means substituted in place of the handwheel which is conventionally associated with a sewing machine mainshaft, said means comprising an auxiliary circuit for supplying electrical power to said electric motor and including a predetermined slow speed control means, operator accessible switch means for selectively connecting said electric motor to said main or to said auxiliary circuit and for influencing the internal wiring of said electric motor selectively to control the direction of electric motor rotation.
Claim 3
Dependent Claim
50 words
In a sewing machine as set forth in claim 1 in which said operator accessible switch means comprises a single three-position switch effective in the extreme positions to connect the auxiliary circuit to said electric motor and to effect a different direction of electric motor rotation in each extreme position.
Claim 4
Dependent Claim
40 words
In a sewing machine as set forth in claim 1 in which said main and auxiliary circuits are adapted to accommodate a source of alternating current electric power and the predetermined slow speed control means includes a silicon controlled rectifier.
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) | 1977-04-15 | 1977-10-15 | 1978-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-15 | 1981-10-15 | 1982-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-15 | 1985-10-15 | 1986-04-16 | $7700.00 | Window Closed / Lapsed |