Patent US3919871A successfully refreshed from Google Patents.
US3919871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for producing a neck on a metal container having a closed bottom
Assignee: Novex Rt
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Filing: 1974-07-15
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Granted: 1975-11-18
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Expires: 1994-07-15
Abstract
Abstract The invention concerns a process and apparatus for the manufacture of metallic products, principally cartridges, bulbs or other similar articles, having a closed bottom and a neck. In the process according to the invention the workpiece to be shaped is placed in a press and is subjected simultaneously to internal and external pressure by a pressurized fluid such as an hydraulic medium, and the neck-drawing step is carried out in this compressively stressed condition. In the apparatus according to the invention suitable cavities are formed outside and inside of the workpiece for the introduction of the pressure medium, which cavities communicate with the source of the medium, and this medium can be placed under the technologically required pressure.
Inventors
- 👤 Ivan Andrasev
- 👤 Jozsef Nemeth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:11
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/54
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
98 words
A process for the production of a neck on a metal container having a closed bottom, comprising placing a metal container having a closed bottom in a press with the closed bottom of the metal container supported by the press, subjecting both the interior and the exterior of the container to the pressure of a fluid under positive pressure, and while maintaining said positive pressure reducing the internal diameter of the end of said container which is remote from said closed bottom by pressing simultaneously on both ends of the container in opposite directions lengthwise of the container.
Claim 2
Dependent Claim
98 words
A process for the production of a neck on a metal container having a closed bottom, comprising placing a metal container having a closed bottom in a press with the closed bottom of the metal container supported by the press, subjecting both the interior and the exterior of the container to the pressure of a fluid under positive pressure, and while maintaining said positive pressure reducing the internal diameter of the end of said container which is remote from said closed bottom by pressing simultaneously on both ends of the container in opposite directions lengthwise of the container.
Claim 3
Dependent Claim
17 words
A process as claimed in claim 1, and forming said neck in a single said pressing operation.
Claim 4
Dependent Claim
31 words
A process as claimed in claim 1, and disposing a thread borer in said neck to form an internal thread on said neck while said container is held in said press.
Claim 5
Dependent Claim
103 words
Apparatus for forming a neck on a metal container having a closed bottom, comprising a press having therein a piston that bears against the closed bottom of the container, a ring spaced from the piston and having an internal diameter less than the greatest internal diameter of the container to form said neck on said container, means for moving said ring and piston toward each other, and means for introducing fluid under pressure into said container and into said press externally of said container thereby to permit formation of said neck by a single movement of said ring and piston toward each other.
Claim 6
Dependent Claim
103 words
Apparatus for forming a neck on a metal container having a closed bottom, comprising a press having therein a piston that bears against the closed bottom of the container, a ring spaced from the piston and having an internal diameter less than the greatest internal diameter of the container to form said neck on said container, means for moving said ring and piston toward each other, and means for introducing fluid under pressure into said container and into said press externally of said container thereby to permit formation of said neck by a single movement of said ring and piston toward each other.
Claim 7
Dependent Claim
17 words
Apparatus as claimed in claim 4, and means for moving said piston axially relative to said press.
Claim 8
Dependent Claim
45 words
Apparatus as claimed in claim 4, said press having side walls surrounding and spaced from said container, said ring being movable relative to said side walls, and means sealing said ring fluidtightly with said side walls when said ring and piston move toward each other.
Claim 9
Dependent Claim
27 words
Apparatus as claimed in claim 4, the bottom of the container being semi-cylindrical and the piston having a semi-cylindrical seat that receives the bottom of the container.
Claim 10
Dependent Claim
22 words
Apparatus as claimed in claim 4, and a thread cutting tool reciprocable into and out of the press axially of the container.
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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |