US4020319A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming a knitting needle latch pivot
Assignee: EXELTOR Inc A CORP OF CANADA
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Filing: 1975-10-28
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Granted: 1977-04-26
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Expires: 1995-10-28
Abstract
Abstract High energy heat, such as the high energy obtained from a laser or a maser, is applied against both wall portions of a latch pivot formed by displacing portions of the opposite walls of the slot in the needle. The applied high energy heat melts portions of the displaced portions of the walls so that when the melted metal solidifies a unified integral pivot is formed having the same chemical composition throughout.
Inventors
- 👤 Richard Wilton Shepard
- 👤 Albert Sidney Ashmead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:36
CPC Classifications
D; D04; D04B; D04B35/00; D04B35/02; D04B35/04; B; B23; B23K; B23K26/00; B23K26/02; B23K26/06; B23K26/0604; B23K26/0619; B23K26/067
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
148 words
In a method of forming a latch pivot for a latch needle, having portions of the opposite walls of the slot in the needle displaced into a pivot hole of the latch with a space between the displaced portions and with spaces separating the latch from each of the opposite walls of the slot, the improvement comprising the steps of: simultaneously applying controlled heat from a high energy heat source against both displaced wall portions to at least melt a portion of said displaced wall portions so that molten metal is formed in the space between the two displaced wall portions; the extent of the molten metal being controlled to substantially fill said space without contacting the latch and allowing the molten metal to solidify to fuse the displaced wall portions together without changing the spaces separating the latch from each of the opposite walls of the slot.
Claim 2
Dependent Claim
148 words
In a method of forming a latch pivot for a latch needle, having portions of the opposite walls of the slot in the needle displaced into a pivot hole of the latch with a space between the displaced portions and with spaces separating the latch from each of the opposite walls of the slot, the improvement comprising the steps of: simultaneously applying controlled heat from a high energy heat source against both displaced wall portions to at least melt a portion of said displaced wall portions so that molten metal is formed in the space between the two displaced wall portions; the extent of the molten metal being controlled to substantially fill said space without contacting the latch and allowing the molten metal to solidify to fuse the displaced wall portions together without changing the spaces separating the latch from each of the opposite walls of the slot.
Claim 3
Dependent Claim
75 words
The method of forming a latch pivot for a latch needle in accordance with claim 1 wherein: the high energy heat source is a laser, the laser energy is fired from one side of the laser, the light from the laser is divided into approximately equal parts, with one of said equal parts being directed against one displaced wall portion, and the other of said equal parts being directed against the other displaced wall portion.
Claim 4
Dependent Claim
76 words
The method of forming a latch pivot for a latch needle in accordance with claim 1 wherein: the high energy heat source is a laser, the laser is fired from both ends, with an equal amount of energy coming from each end, and the energy from one end of the laser is applied against one displaced wall portion and the energy from the other end of the laser is applied against the other displaced wall portion.
References Cited (Backward Citations)
US3230475A
Cited
US3729248A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |