US3173393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thread cutting mechanism for lockstitch sewing machines
Assignee: GM Pfaff AG
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Filing: 1962-12-12
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Granted: 1965-03-16
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Expires: 1982-12-12
Abstract
No abstract record available.
Inventors
- 👤 Adam Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:52
CPC Classifications
D; D05; D05B; D05B65/00; D05B57/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
IN COMBINATION WITH A LOCKSTITCH SEWING MACHINE INCLUDING A STITCHING PLATE, A RECIPROCATING NEEDLE ABOVE SAID PLATE, AND A ROTATING CYLINDRICAL LOOP TAKER MOUNTED BELOW SAID PLATE AND SYNCHRONIZED WITH SAID NEEDLE, TO FORM LOCK STITCHES BY THE NEEDLE AND LOOP TAKER THREADS; THREAD TRIMMING MECHANISM COMPRISING AN ARCUATE BLADE ELEMENT HAVING A FRONT EDGE FORMING TRIANGULAR PROJECTION AND PROVIDED WITH A RECESS ADJOINING SAID PROJECTION, SAID ELEMENT BEING DISPOSED CLOSE TO THE OUTER SURFACE OF, AND ROTATABLE COAXIALLY WITH SAID LOOP TAKER, OPERATING MEANS TO INITIATE ROTATION OF SAID ELEMENT FROM A STARTING POSITION IN PREDETERMINED RELATION TO AND IN SYNCHRONISM
Claim 2
Dependent Claim
102 words
IN COMBINATION WITH A LOCKSTITCH SEWING MACHINE INCLUDING A STITCHING PLATE, A RECIPROCATING NEEDLE ABOVE SAID PLATE, AND A ROTATING CYLINDRICAL LOOP TAKER MOUNTED BELOW SAID PLATE AND SYNCHRONIZED WITH SAID NEEDLE, TO FORM LOCK STITCHES BY THE NEEDLE AND LOOP TAKER THREADS; THREAD TRIMMING MECHANISM COMPRISING AN ARCUATE BLADE ELEMENT HAVING A FRONT EDGE FORMING TRIANGULAR PROJECTION AND PROVIDED WITH A RECESS ADJOINING SAID PROJECTION, SAID ELEMENT BEING DISPOSED CLOSE TO THE OUTER SURFACE OF, AND ROTATABLE COAXIALLY WITH SAID LOOP TAKER, OPERATING MEANS TO INITIATE ROTATION OF SAID ELEMENT FROM A STARTING POSITION IN PREDETERMINED RELATION TO AND IN SYNCHRONISM
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-15 | 1968-09-14 | 1969-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-15 | 1972-09-14 | 1973-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-15 | 1976-09-14 | 1977-03-16 | $7700.00 | Window Closed / Lapsed |