Patent US3861446A successfully refreshed from Google Patents.
US3861446A
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Method for making latch needles
Assignee: SINGER SPEZIALNADELFABRIK A CORP OF WEST GERMANY GmbH
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Filing: 1973-10-29
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Granted: 1975-01-21
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Expires: 1993-10-29
Abstract
Abstract A method of manufacturing latch needles by dieforming the exterior shape and a V-shaped recess including latch seats in a needle blank between a complemental punch and die, and fastening a preformed latch within the recess. The latch may be preformed with a pair of pins and fastened within the recess by pressing the walls of the recess against the respective pin to form bearing seats in the walls. The method may include the step of slotting the bottom of the recess during the dieforming operation.
Inventors
- 👤 Josef Zocher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:56
CPC Classifications
B; B21; B21G; B21G1/00; B21G1/10; B21G1/06; D; D04; D04B; D04B35/00; D04B35/02; D04B35/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
118 words
The method of manufacturing a latch needle comprising the steps of: a. locating an elongated metallic needle blank in a die; b. pressing a forming punch into said blank with a force sufficient to cause the metal to flow between the punch and the die to form the exterior surface of said needle and to form a longitudinal recess in the blank; c. inserting a latch preformed with a pair of oppositely extending protuberances into the recess with each protuberance facing a longitudinal wall of said recess; and d. fastening the latch in the recess by transversely pressing each of said walls inwardly against the respective protuberance to form a bearing surface in the walls for said latch.
Claim 2
Independent Claim
118 words
The method of manufacturing a latch needle comprising the steps of: a. locating an elongated metallic needle blank in a die; b. pressing a forming punch into said blank with a force sufficient to cause the metal to flow between the punch and the die to form the exterior surface of said needle and to form a longitudinal recess in the blank; c. inserting a latch preformed with a pair of oppositely extending protuberances into the recess with each protuberance facing a longitudinal wall of said recess; and d. fastening the latch in the recess by transversely pressing each of said walls inwardly against the respective protuberance to form a bearing surface in the walls for said latch.
Claim 3
Dependent Claim
38 words
In the method recited in claim 1 wherein said die and said punch each include portions having complementary oblique walls so that said recess includes oblique longitudinal walls, said fastening comprising pressing said oblique walls of said recess.
Claim 4
Dependent Claim
19 words
The method recited in claim 1 including the step of punching a slot through the bottom of said recess.
Claim 5
Dependent Claim
18 words
The method recited in claim 3 wherein said slot is punched simultaneously with the forming of said recess.
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) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |