US3812698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spin-flanging tool
Assignee: Nortek Global HVAC LLC
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Filing: 1973-03-05
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Granted: 1974-05-28
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Expires: 1993-03-05
Abstract
Abstract A tool forms an externally flanged hole, either in ductile flat sheet metal or tubes, by a single downward rotating stroke. Circular slugs are removed and the resultant circular edges spun upward and outward in flanges of precise inner and outer diameter. The tool is especially useful where T-connections are to be brazed to the wall of a ductile metal tube.
Inventors
- 👤 E Stock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:16
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/15; B21C37/28; B21C37/29; B21C37/298; B23; B23B; B23B51/00; B23B51/08; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49428; Y10T29/49442
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
161 words
For use in a drill press or the like to form flanges about holes in ductile sheet metal workpieces, a spin-flanging tool having a central axis and comprising a shank portion whereby to engage to such a drill press, and a threaded portion commencing below the shank portion at a maximum diameter and extending downwardly therefrom and tapering inward toward such axis to a minimum diameter base end, said tapered thread portion having multiple lead threads commencing at equal spacings about such base end and leading upward from its minimum diameter to such maximum diameter, the upward and outward presented surface portions of such threads being smoothly rounded, whereby, when the rate of downward movement of the tool per revolution is restrainedly limited to an amount less than the pitch of the threads, said thread surface portions will progressively bear upward and outward against the edge of a hole in such workpiece, thereby to spin such edge into an upward flange.
Claim 2
Dependent Claim
161 words
For use in a drill press or the like to form flanges about holes in ductile sheet metal workpieces, a spin-flanging tool having a central axis and comprising a shank portion whereby to engage to such a drill press, and a threaded portion commencing below the shank portion at a maximum diameter and extending downwardly therefrom and tapering inward toward such axis to a minimum diameter base end, said tapered thread portion having multiple lead threads commencing at equal spacings about such base end and leading upward from its minimum diameter to such maximum diameter, the upward and outward presented surface portions of such threads being smoothly rounded, whereby, when the rate of downward movement of the tool per revolution is restrainedly limited to an amount less than the pitch of the threads, said thread surface portions will progressively bear upward and outward against the edge of a hole in such workpiece, thereby to spin such edge into an upward flange.
Claim 3
Dependent Claim
28 words
A spin-flanging tool as defined in claim 1 and useful where the workpieces are tubes, wherein the angle of taper of the threaded portion is substantially 15* .
Claim 4
Dependent Claim
26 words
A spin-flanging tool as defined in claim 1, wherein the angle of taper of the threaded portion is in the range between 5* and 25* .
Claim 5
Dependent Claim
44 words
A spin-flanging tool as defined in claim 1, wherein the number of said multiple lead threads is two and all surface portions of said threads are rounded, to form crests and valleys, and the crests have a radius larger than that of the valleys.
Claim 6
Dependent Claim
44 words
For use in a drill press or the like to form flanged holes in ductile sheet metal workpieces, a hole cutting and flanging tool comprising the spin-flanging tool defined in claim 1, further having a circular cutting tip projecting downward at its base end.
Claim 7
Dependent Claim
43 words
A hole cutting and flanging tool as defined in claim 5, wherein the radius of the cutting tip exceeds the radius to the thread valley immediately thereabove, whereby said multiple threads may enter a hole so cut and bear upwardly against its edge.
Claim 8
Dependent Claim
44 words
A hole cutting and flanging tool as defined in claim 6, in which the cutting tip has along the tool axis, a downwardly projecting pointed center, whereby to indent and hold centered the circular slug portion of such workpiece as cut by the tip.
Claim 9
Dependent Claim
98 words
In combination, a spin-flanging tool as defined in claim 1, and upper fixture means having a lower surface portion of predetermined contour, whereby to fit closedly adjacent to the upper surface of such workpiece to be flanged, and having therethrough a tool passage including a cylindrical flange-confining portion commencing at the said fixture lower surface portion and extending upwardly therefrom, the diameter of said flange-confining portion upwardly adjacent to said lower surface portion being substantially equal to the sum of said maximum diameter of the tool threaded portion plus twice the thickness of the flange to be formed.
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) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |