Patent US3937053A successfully refreshed from Google Patents.
US3937053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Forming die structure
Assignee: Individual
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Filing: 1974-08-27
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Granted: 1976-02-10
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Expires: 1994-08-27
Abstract
Abstract A die assembly for forming nuts or the like in which a die cavity is formed to extend into two abutting members of super hard alloy, the cavity extending through one member and having a bottom surface in the other. The hard alloy members rest on a hardened steel stock die and the three elements are shrink fitted in a reinforcement ring. A passageway communicates with the interface between the hard alloy members and extends to a position adjacent but spaced from the interface between those members. When forming pressure is applied to a workpiece in the cavity, the stock die yields resiliently to permit a slight separation between the hard alloy members and thus provide a vent passage for trapped air to the exterior of the assembly. The interface between the die members and the reinforcement ring permits such downward movement of the lower alloy die member but prevents upward ejection of the die members from the reinforcement ring upon operation of a work ejecting mechanism.
Inventors
- 👤 Mototsugu Akamatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:09
CPC Classifications
B; B21; B21J; B21J13/00; B21J13/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
170 words
A forming die having an upwardly open die cavity therein, comprising: an upper die member of hard material having the upper portion of said die cavity extending therethrough; a lower die member of hard material abutting a lower surface of said upper die member and having the lower portion of said die cavity formed therein, including an upwardly facing bottom surface of said cavity; a stock die member underlying and abutting said lower die member and being of softer and more resilient material than said upper and lower die members; an air vent passage extending from the exterior of said die to the interface between said upper and lower die members adjacent but spaced outwardly from said die cavity, said passage opening slightly upon the downward movement of said lower die as said stock die compresses, and said passage immediately closing thereafter whereby metal cannot enter said passage; and a reinforcing ring member tightly surrounding said upper, lower and stock die members and holding the same in said described relationship.
Claim 2
Dependent Claim
170 words
A forming die having an upwardly open die cavity therein, comprising: an upper die member of hard material having the upper portion of said die cavity extending therethrough; a lower die member of hard material abutting a lower surface of said upper die member and having the lower portion of said die cavity formed therein, including an upwardly facing bottom surface of said cavity; a stock die member underlying and abutting said lower die member and being of softer and more resilient material than said upper and lower die members; an air vent passage extending from the exterior of said die to the interface between said upper and lower die members adjacent but spaced outwardly from said die cavity, said passage opening slightly upon the downward movement of said lower die as said stock die compresses, and said passage immediately closing thereafter whereby metal cannot enter said passage; and a reinforcing ring member tightly surrounding said upper, lower and stock die members and holding the same in said described relationship.
Claim 3
Dependent Claim
23 words
A forming die as defined in claim 1 wherein said upper and lower die members are formed of a hard sintered metal alloy.
Claim 4
Dependent Claim
17 words
A forming die as defined in claim 1 wherein said stock die is formed of quenched steel.
Claim 5
Dependent Claim
68 words
A forming die as defined in claim 1 wherein said upper portion of said die cavity is an opening of hexagonal shape for forming the body portion of a nut and wherein said lower portion of said cavity is a depression in the upper surface of said lower die member, complementary to said upper portion of said cavity and shaped to form the head portion of a nut.
Claim 6
Dependent Claim
55 words
A forming die as defined in claim 1 wherein said air vent passage is defined by an annular space between said upper and lower die members, surrounding said cavity but spaced outwardly a short distance therefrom, and a passageway communicating with said annular space and leading therefrom to the exterior of said reinforcing ring member.
Claim 7
Dependent Claim
117 words
A forming die as defined in claim 1 including a central opening extending from the bottom of said cavity downwardly through said lower die member and said stock die member, for movement therethrough of a work ejecting tool; the outer peripheries of said upper and lower die members defining a cone surface abutting a complementary cone surface in said reinforcing ring whereby to resist upward displacement of said die members upon operation of said work ejecting tool while permitting downward movement of said lower die member, relative to said upper die member, in response to pressure applied to a workpiece in said cavity whereby to establish limited communication between said die cavity and said air vent passage.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-09 | 1979-08-11 | 1980-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-09 | 1983-08-11 | 1984-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-09 | 1987-08-11 | 1988-02-10 | $7700.00 | Window Closed / Lapsed |