US3875649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coldworking method and apparatus with frangible head flange
Assignee: KING JOHN O JUN
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Filing: 1974-07-18
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Granted: 1975-04-08
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Expires: 1994-07-18
Abstract
Abstract A method of coldworking a hole through a work piece which includes the steps of placing a seamless tubular member with a head flange through the hole in the work piece, passing a mandrel through the tubular member so that the tubular member is expanded radially and circumferentially sufficiently to expand the material in the work piece about the hole beyond its elastic limit, and circumferentially fracturing the tubular member adjacent the head flange after substantially all of the length of the tubular member has been expanded to leave a headless tubular member within the holes. The application also contemplates a tubular member construction for use in the method.
Inventors
- 👤 Jr John O King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:10
CPC Classifications
B; B23; B23P; B23P9/00; B23P9/02; B23P9/025; F; F16; F16B; F16B4/00; F16B4/004; F16B19/00; F16B19/04; F16B19/08; F16B19/10; F16B19/1027; F16B19/1036; F16B19/1045; Y; Y10; Y10T; Y10T225/00; Y10T225/10; Y10T225/30; Y10T225/393; Y10T29/00; Y10T29/49; Y10T29/49799; Y10T29/49826; Y10T29/49908; Y10T29/49938; Y10T29/4994
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
74 words
A method of coldworking a hole through a work piece comprising the steps of: a. radially and circumferentially expanding a tubular member having an annular head flange integral with one end thereof held within the hole through the work pieces so that the material about the hole is expanded beyond its elastic limit; and, b. circumferentially fracturing the tubular member at the juncture with the head flange after substantial expansion of the tubular member.
Claim 2
Independent Claim
74 words
A method of coldworking a hole through a work piece comprising the steps of: a. radially and circumferentially expanding a tubular member having an annular head flange integral with one end thereof held within the hole through the work pieces so that the material about the hole is expanded beyond its elastic limit; and, b. circumferentially fracturing the tubular member at the juncture with the head flange after substantial expansion of the tubular member.
Claim 3
Dependent Claim
37 words
The method of claim 1 wherein the step of expanding the tubular member includes passing a mandrel having an expansion section thereon larger than the initial inside diameter of the tubular member axially through the tubular member.
Claim 4
Dependent Claim
60 words
The method of claim 2 wherein the tubular member has a circumferentially extending groove on the inside thereof at the juncture of the tubular member and the head flange to reduce the strength of the tubular member thereat sufficiently to cause the tubular member to fracture circumferentially as an incident to the expansion of the tubular member a prescribed amount.
Claim 5
Dependent Claim
27 words
The method of claim 3 wherein the prescribed amount of expansion is approximately five and one-half percent of the inside diameter of said tubular member after expansion.
Claim 6
Dependent Claim
96 words
Apparatus for coldworking a hole through a work piece including a tubular member comprising an annular seamless side wall defining a passage therethrough, an annular head flange integral with one end of said side wall and extending outwardly therefrom, said side wall including a circumferentially extending weakened section around its circumference adjacent the juncture of said side wall and said head flange constructed and arranged to cause said side wall to fracture circumferentially along said weakened section upon a prescribed radial and circumferential expansion of said annular side wall in the vicinity of said weakened section.
Claim 7
Dependent Claim
96 words
Apparatus for coldworking a hole through a work piece including a tubular member comprising an annular seamless side wall defining a passage therethrough, an annular head flange integral with one end of said side wall and extending outwardly therefrom, said side wall including a circumferentially extending weakened section around its circumference adjacent the juncture of said side wall and said head flange constructed and arranged to cause said side wall to fracture circumferentially along said weakened section upon a prescribed radial and circumferential expansion of said annular side wall in the vicinity of said weakened section.
Claim 8
Dependent Claim
39 words
The apparatus of claim 5 wherein said side wall defines a circumferentially extending groove therein along the inside thereof defining said weakened section circumferentially around said side wall at the juncture of said side wall with said head flange.
Claim 9
Dependent Claim
17 words
The apparatus of claim 6 wherein said side wall has a substantially constant thickness along its length.
Claim 10
Dependent Claim
17 words
The apparatus of claim 7 wherein said side wall has a substantially constant diameter along its length.
Claim 11
Dependent Claim
48 words
The apparatus of claim 8 wherein said groove is constructed and arranged to cause said side wall to fracture thereat upon a diametrical expansion of said side wall approximately 5 and 1/2 percent of the diameter of the inside diameter of said tubular member in its expanded condition.
Claim 12
Dependent Claim
76 words
The apparatus of claim 9 further including a mandrel having an outside larger and an outside smaller diameter, said larger diameter larger than the inside diameter of said tubular member and said smaller diameter smaller than the inside diameter of said tubular member; and forcing means for forcing said mandrel through said tubular member to diametrically enlarge said side wall at least five and one-half percent of the desired expanded inside diameter of said tubular member.
Claim 13
Dependent Claim
110 words
The apparatus of claim 10 further including a backup member having an aperture therethrough at least as small as the inside diameter of said tubular member and larger than said smaller diameter of said mandrel so that when said smaller diameter is inserted through said passage of said tubular member and said backup member positioned on said smaller diameter in opposition with said larger diameter across said tubular member, said larger diameter and said backup member can be forced toward each other to cause said larger diameter to pass through said passage and said aperture to enlarge the diameter of said tubular member and the holes through said tubular member.
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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) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |