US3332381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic underthread winding apparatus for lockstitch sewing machines
Assignee: GM Pfaff AG
•
Filing: 1965-07-27
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Granted: 1967-07-25
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Expires: 1985-07-27
Abstract
No abstract record available.
Inventors
- 👤 Dobner Reinhold
- 👤 Berg Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:10
CPC Classifications
D; D05; D05B; D05B59/00; D05B57/00; D05B57/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
IN UNDERTHREAD WINDING APPARATUS FOR A LOCKSTICH SEWING MACHINE INCLUDING A RECIPROCATORY NEEDLE AND A ROTARY LOOP TAKER COOPERATING THEREWITH, TO FORM LOCKSTITCHES IN THE WORK BEING OPERATED ON, (1) SAID LOOP TAKER INCLUDING (A) A CUP-SHAPED ROTARY HOOK BODY, (B) A STATIONARY CYLINDRICAL BOBBIN CASE SUPPORTED IN SAID HOOK BODY, (C) A PAIR OF UNDERTHREAD BOBBINS HAVING CONCENTRIC CORES MOUNTED IN SAID CASE FOR INDEPENDENT ROTATION IN END TO END RELATION, AND (D) RESILIENT THREAD CLAMPING MEANS UPON EACH OF SAID BOBBINS, (E) THE ADJOINING EDGES OF SAID CORES PROVIDING A PAIR OF FRICTION COUPLING SURFACES FOR SAID BOBBINS, (2) SAID HOOK BODY AND CASE HAVING APERTURES IN THE SIDE WALLS THEREOF AND BEING IN ALIGNMENT AT A PREDETERMINED NEEDLE POSITION,
Claim 2
Dependent Claim
122 words
IN UNDERTHREAD WINDING APPARATUS FOR A LOCKSTICH SEWING MACHINE INCLUDING A RECIPROCATORY NEEDLE AND A ROTARY LOOP TAKER COOPERATING THEREWITH, TO FORM LOCKSTITCHES IN THE WORK BEING OPERATED ON, (1) SAID LOOP TAKER INCLUDING (A) A CUP-SHAPED ROTARY HOOK BODY, (B) A STATIONARY CYLINDRICAL BOBBIN CASE SUPPORTED IN SAID HOOK BODY, (C) A PAIR OF UNDERTHREAD BOBBINS HAVING CONCENTRIC CORES MOUNTED IN SAID CASE FOR INDEPENDENT ROTATION IN END TO END RELATION, AND (D) RESILIENT THREAD CLAMPING MEANS UPON EACH OF SAID BOBBINS, (E) THE ADJOINING EDGES OF SAID CORES PROVIDING A PAIR OF FRICTION COUPLING SURFACES FOR SAID BOBBINS, (2) SAID HOOK BODY AND CASE HAVING APERTURES IN THE SIDE WALLS THEREOF AND BEING IN ALIGNMENT AT A PREDETERMINED NEEDLE POSITION,
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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) | 1970-07-24 | 1971-01-23 | 1971-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-24 | 1975-01-23 | 1975-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-24 | 1979-01-23 | 1979-07-25 | $7700.00 | Window Closed / Lapsed |