US3918288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Die
Assignee: Lasalle Steel Co
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Filing: 1970-08-10
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Granted: 1975-11-11
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Expires: 1990-08-10
Abstract
Abstract This invention is addressed to a new and improved die for use in extrusion and drawing operations which includes an annular casing, a die nib which is shrunk fit into a central opening in the casing and means exerting a compressive force on the die nib in the axial direction whereby the die nib is subject to both radial and axial compressive stresses.
Inventors
- 👤 Miguel A Verduzco
- 👤 James W Dally
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:56
CPC Classifications
B; B21; B21C; B21C25/00; B21C25/02; B21C25/10; B21C3/00; B21C3/02; B21C3/04; B21C3/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
A die comprising a casing having axially spaced flanges extending inwardly to define a central opening in the casing, a die nib having an axial dimension greater than the spacing between the flanGes of said casing and a diameter greater than the diameter of said central opening positioned in said central opening whereby the die nib is adapted to be received in the central opening when the casing is at an elevated temperature whereby the nib in the central opening is subjected to axial and radial stresses on cooling of the casing, and a ring about the casing having a central recess corresponding to the outer surface of the casing, with the ring being adapted to receive the casing when the ring is at an elevated temperature whereby the ring exerts a radial stress on the die nib on cooling.
Claim 2
Dependent Claim
140 words
A die comprising a casing having axially spaced flanges extending inwardly to define a central opening in the casing, a die nib having an axial dimension greater than the spacing between the flanGes of said casing and a diameter greater than the diameter of said central opening positioned in said central opening whereby the die nib is adapted to be received in the central opening when the casing is at an elevated temperature whereby the nib in the central opening is subjected to axial and radial stresses on cooling of the casing, and a ring about the casing having a central recess corresponding to the outer surface of the casing, with the ring being adapted to receive the casing when the ring is at an elevated temperature whereby the ring exerts a radial stress on the die nib on cooling.
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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |