US3790740A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Through deck welding
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1971-12-13
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Granted: 1974-02-05
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Expires: 1991-12-13
Abstract
Abstract This invention is directed to a drawn-arc welding gun with means for providing a rotary flow of air, or stream of fluid, around the weld area. This invention is also directed to ferrules which are designed to enhance movement of air or fluid around the weld area.
Inventors
- 👤 T Shoup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:39
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/20; B23K9/201; B23K9/202; B23K9/207; B23K9/208
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
182 words
A ferrule for use in welding a stud to a workpiece, said ferrule comprising a ceramic body having a front face and a rear face, a cylindrical outer wall near the front face, a concentric inner cylindrical wall near the front face, and an inner wall near the rear face of circular tranverse cross section with a smaller diameter than that of said inner cylindrical wall, a plurality of substantially uniformly spaced notches in said front face and extending from the outer cylindrical wall radially through to the inner cylindrical wall and being generalLy rectangular in shape as viewed from outside the outer cylindrical wall, said notches being of uniform size and shape throughout their thickness, said front face comprising a plurality of truncated triangular areas of symmetrical shape arranged in a circular pattern between said notches, said symmetrical triangular areas being equal in number to the number of said notches and said areas constituting substantially less than half the projected area of said front face, said rear face having a chamfered inner edge where it would otherwise meet said inner wall.
Claim 2
Dependent Claim
182 words
A ferrule for use in welding a stud to a workpiece, said ferrule comprising a ceramic body having a front face and a rear face, a cylindrical outer wall near the front face, a concentric inner cylindrical wall near the front face, and an inner wall near the rear face of circular tranverse cross section with a smaller diameter than that of said inner cylindrical wall, a plurality of substantially uniformly spaced notches in said front face and extending from the outer cylindrical wall radially through to the inner cylindrical wall and being generalLy rectangular in shape as viewed from outside the outer cylindrical wall, said notches being of uniform size and shape throughout their thickness, said front face comprising a plurality of truncated triangular areas of symmetrical shape arranged in a circular pattern between said notches, said symmetrical triangular areas being equal in number to the number of said notches and said areas constituting substantially less than half the projected area of said front face, said rear face having a chamfered inner edge where it would otherwise meet said inner wall.
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |