US3645222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-threading sewing machine needle
Assignee: SINGER SPEZIALNADELFABRIK A CORP OF WEST GERMANY GmbH
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Filing: 1970-09-24
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Granted: 1972-02-29
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Expires: 1990-09-24
Abstract
Abstract A sewing machine needle is disclosed in which a threading slot extends lengthwise along the needle blade and opens onto the needle eye. A twist is formed in the needle blade so that the portions of the needle blade which are separated by the threading slot are wrapped about each other and stabilized thereby.
Inventors
- 👤 Josef Zocher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:47
CPC Classifications
D; D05; D05B; D05B85/00; D05B85/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
129 words
A self-threading sewing machine needle including a shank adapted to be clamped to the sewing machine, a blade extending from the shank and terminating in a pointed extremity formed with a thread-carrying eye, said blade being formed with a lengthwise thread accommodating groove extending from said thread-carrying eye toward said shank, a threading slot formed through said needle blade and extending lengthwise from adjacent to said shank into said thread-carrying eye, said threading slot opening at one side of said needle blade into said thread-accommodating groove, a thread inlet slot formed transversely across said needle blade adjacent said shank and opening onto said threading slot, and said needle blade along the length of said threading slot being formed with a twist about the longitudinal axis of the needle blade.
Claim 2
Dependent Claim
129 words
A self-threading sewing machine needle including a shank adapted to be clamped to the sewing machine, a blade extending from the shank and terminating in a pointed extremity formed with a thread-carrying eye, said blade being formed with a lengthwise thread accommodating groove extending from said thread-carrying eye toward said shank, a threading slot formed through said needle blade and extending lengthwise from adjacent to said shank into said thread-carrying eye, said threading slot opening at one side of said needle blade into said thread-accommodating groove, a thread inlet slot formed transversely across said needle blade adjacent said shank and opening onto said threading slot, and said needle blade along the length of said threading slot being formed with a twist about the longitudinal axis of the needle blade.
Claim 3
Dependent Claim
41 words
A self-threading sewing machine needle as set forth in claim 1 in which said twist formed in said needle blade extends continuously and in one direction for an angle of greater than 180* about the longitudinal axis of the needle blade.
Claim 4
Dependent Claim
52 words
A self-threading sewing machine needle as set forth in claim 1 in which said twist in the needle blade extends only from said thread inlet slot adjacent the needle shank to a point along said needle blade less than half the distance between said thread inlet slot and the thread-carrying needle eye.
Claim 5
Dependent Claim
65 words
A self-threading sewing machine needle as set forth in claim 1 in which said needle blade is formed with a pair of thread-accommodating grooves one at each side of the needle blade and each groove extending from said thread-carrying eye to said shank, and in which said threading slot opens at each side of said needle blade into a respective one of said thread-accommodating grooves.
Claim 6
Dependent Claim
27 words
A self-threading sewing machine needle as set forth in claim 4 in which said threading slot opens along one extreme edge of each of said thread-accommodating grooves.
Claim 7
Dependent Claim
25 words
A self-threading sewing machine needle as set forth in claim 4 in which one of said thread-accommodating grooves is appreciably narrower than the other groove.
Claim 8
Dependent Claim
43 words
A self-threading sewing machine needle as set forth in claim 1 in which said thread-carrying eye is fOrmed with tapered sides which diverge from the pointed extremity of the needle and are widest at the eye extremity into which said threading slot opens.
Claim 9
Dependent Claim
35 words
A self-threading sewing machine needle as set forth in claim 1 in which said threading slot is formed with sidewalls which are arranged substantially in touching relationship in the absence of a thread forced therebetween.
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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |