US3879980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hole enlarging system
Assignee: KING JOHN O JUN
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Filing: 1974-04-22
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Granted: 1975-04-29
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Expires: 1994-04-22
Abstract
Abstract A system for enlarging the diameter of holes through work pieces using a seamless tubular member which includes a tool having a mandrel with an expansion section thereon of a diameter larger than the initial diameter of the holes, driving means for forcing the mandrel through the holes to enlarge same, and a backup member with an aperture therethrough of a diameter at least as small as the initial inside diameter of the tubular member that is positioned against the work pieces in opposition to the mandrel with its aperture aligned with the holes. The aperture of the backup member is enlarged simultaneously with the enlargement of the holes immediately adjacent the backup member so as to support the material of the work pieces about the holes and the seamless tubular member at all times during the enlargement of the holes. The system also contemplates the method of using same and the joint produced thereby.
Inventors
- 👤 Jr John O King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:13
CPC Classifications
B; B23; B23P; B23P9/00; B23P9/02; B23P9/025; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49938; Y10T29/4994
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
336 words
A device for enlarging holes through work pieces wherein the holes have been deburred on one side thereof to form a shoulder at the holes and a working surface about the holes extending from the shoulder to the opposite side of the work pieces comprising: a seamless and headless tubular member having an outside diameter smaller than the initial diameter of the holes through the work pieces, defining a passage therethrough and having an annular end surface generally normal to the centerline of said tubular member; 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, a back-up member including a body defining an aperture therethrough of substantially the same diameter 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, said back-up member further including a lip about said aperture at one end thereof, said lip defining an annular support surface generally normal to the centerline of said aperture and corresponding in size and shape to said annular end surface of said tubular member, said lip further defining an outer surface complimentary to the shoulder at the holes in the work pieces so that said support surface on said lip supports said end surface of said tubular member at a prescribed location in the holes during enlargement and said outer surface enlarges the diameter at the shoulder of the work pieces as said lip is enlarged.
Claim 2
Independent Claim
336 words
A device for enlarging holes through work pieces wherein the holes have been deburred on one side thereof to form a shoulder at the holes and a working surface about the holes extending from the shoulder to the opposite side of the work pieces comprising: a seamless and headless tubular member having an outside diameter smaller than the initial diameter of the holes through the work pieces, defining a passage therethrough and having an annular end surface generally normal to the centerline of said tubular member; 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, a back-up member including a body defining an aperture therethrough of substantially the same diameter 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, said back-up member further including a lip about said aperture at one end thereof, said lip defining an annular support surface generally normal to the centerline of said aperture and corresponding in size and shape to said annular end surface of said tubular member, said lip further defining an outer surface complimentary to the shoulder at the holes in the work pieces so that said support surface on said lip supports said end surface of said tubular member at a prescribed location in the holes during enlargement and said outer surface enlarges the diameter at the shoulder of the work pieces as said lip is enlarged.
Claim 3
Dependent Claim
61 words
The device of claim 1 wherein said back-up member is made of a material sufficieNtly strong in compression through its thickness to prevent the collapse of said back-up member as said mandrel is forced therethrough and sufficiently weak and ductile radially to be enlarged by said mandrel as it passes through said aperture by radially expanding said back-up member without fracture.
Claim 4
Dependent Claim
40 words
The device of claim 2 further including forcing means for forcing said mandrel through said tubular member and said back-up member and positioning means for locating said back-up member and said tubular member within the holes through the work pieces.
Claim 5
Dependent Claim
63 words
The device of claim 2 wherein said positioning means includes a positioning flange on said body of said back-up member opposite said lip and locating means on said forcing means for engaging said positioning flange to maintain said aperture and said lip of said back-up member concentric with respect to said mandrel as said forcing means pulls said mandrel through said tubular member.
Claim 6
Dependent Claim
56 words
The device of claim 4 wherein said locating means includes a boss defining a central passage therethrough, said boss having a size and configuration adapted to engage said positioning flange and that side of said body opposite said lip to locate said passage through said boss in axial alignment with said aperture through said back-up member.
Claim 7
Dependent Claim
14 words
The device of claim 5 wherein said back-up member is made of stainless steel.
Claim 8
Dependent Claim
59 words
The device of claim 1 wherein said back-up member is made of a material sufficiently strong in compression through its thickness to prevent the collapse of said back-up member as said mandrel is forced therethrough and sufficiently weak and fracturable radially to be enlarged by said mandrel as it passes through said aperture by radially fracturing said back-up member.
Claim 9
Dependent Claim
21 words
The device of claim 7 further including retaining means for maintaining said back-up member as a unit upon the fracturing thereof.
Claim 10
Dependent Claim
38 words
The device of claim 7 further including cushion means between said body of said back-up member and the working surface of the work pieces during the forcing of said mandrel through said tubular member and said back-up member.
Claim 11
Dependent Claim
25 words
The device of claim 7 further including an annular, flexible and resilient member adhesively attached to that end of said back-up member about said lip.
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) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |