US3905283A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improved rotary cutting die
Assignee: Boeing North American Inc
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Filing: 1974-05-08
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Granted: 1975-09-16
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Expires: 1994-05-08
Abstract
Abstract An improved rotary cutting die and method of producing it are disclosed wherein a cylindrical die blank or support has a weld bead applied on its peripheral surface in a configuration corresponding to the design of the product to be formed. The weld bead is then ground to provide a working surface spaced a predetermined distance radially above the die blank surface whereupon the weld bead is electrical discharge machined to form the required cutting edges coincident with said working surface.
Inventors
- 👤 Kenneth Vincent Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:38
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/28; B23P15/40; B23P15/406; B26; B26F; B26F1/00; B26F1/38; B26F1/44; B26F1/384; B26F2001/4472; Y; Y10; Y10S; Y10S76/00; Y10S76/05; Y10T; Y10T83/00; Y10T83/465; Y10T83/4766; Y10T83/4795; Y10T83/483; Y10T83/4838; Y10T83/929; Y10T83/9372; Y10T83/9387; Y10T83/9411; Y10T83/9423; Y10T83/9457; Y10T83/9464
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
72 words
A rotary cutting die for converting sheet material into die cut products comprising, a cylindrical die blank having a diameter less than a predetermined reference diameter, a weld bead on the peripheral surface of said die blank in a predetermined configuration and serving to increase the effective diameter of said die blank to said predetermined reference diameter, and said weld bead having a cutting edge precisely coincident with said predetermined reference diameter.
Claim 2
Dependent Claim
72 words
A rotary cutting die for converting sheet material into die cut products comprising, a cylindrical die blank having a diameter less than a predetermined reference diameter, a weld bead on the peripheral surface of said die blank in a predetermined configuration and serving to increase the effective diameter of said die blank to said predetermined reference diameter, and said weld bead having a cutting edge precisely coincident with said predetermined reference diameter.
Claim 3
Dependent Claim
26 words
A rotary cutting die as set forth in claim 1 wherein said cutting edge is formed with reduced diameter, laterally projecting shoulders adjacent said peripheral surface.
Claim 4
Dependent Claim
32 words
A rotary cutting die as set forth in claim 1, wherein a portion of said weld bead comprises a creasing edge having a diameter a predetermined amount less than said reference diameter.
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) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |