Patent US3724302A successfully refreshed from Google Patents.
US3724302A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for severing tubes
Assignee: Allegheny Ludlum Corp
•
Filing: 1971-07-29
•
Granted: 1973-04-03
•
Expires: 1991-07-29
Abstract
Abstract The application describes a method and apparatus for accurately severing tubes and pipes, preferably with a burr free cut. Tubes are clamped into position and severed by means of cutters. The cutters and tubes are in relative revolvement. Clamping is preferably done in a manner which exerts a tensile stress in the axial direction of the tube. The tensile stress substantially precludes burr formation. A preferred cutter is an edge tool with a rounded cutting edge.
Inventors
- 👤 E Randich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:22
CPC Classifications
B; B23; B23D; B23D21/00; B23D21/04; Y; Y10; Y10T; Y10T82/00; Y10T82/16; Y10T82/16016
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
61 words
A method for severing a tube which comprises: applying tensile stress in the axial direction of said tube; providing relative revolving motion between said tube and at least one cutter; inducing a rolling action at the point of contact between said at least one cutter and said tube wall and passing said at least one cutter into and through said tube.
Claim 2
Independent Claim
61 words
A method for severing a tube which comprises: applying tensile stress in the axial direction of said tube; providing relative revolving motion between said tube and at least one cutter; inducing a rolling action at the point of contact between said at least one cutter and said tube wall and passing said at least one cutter into and through said tube.
Claim 3
Dependent Claim
16 words
A method according to claim 1 wherein said tensile stress is at least about 500 psi.
Claim 4
Dependent Claim
24 words
A method according to claim 1 wherein said tube is an alloy steel and wherein said tensile stress is at least about 2,000 psi.
Claim 5
Dependent Claim
32 words
A method according to claim 1 wherein said rolling action is induced by an edge tool with a rounded cutting edge having a radius in excess of one sixty-fourth of an inch.
Claim 6
Dependent Claim
38 words
A method according to claim 1 including the steps of inserting said tube into a support tube and clamping said tube in said support tube prior to applying a tensile stress along the longitudinal axis of said tube.
References Cited (Backward Citations)
US3108819A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |