US3771344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for stripping container bodies from metal working punches
Assignee: Crown Cork and Seal Co Inc
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Filing: 1972-10-30
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Granted: 1973-11-13
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Expires: 1992-10-30
Abstract
Abstract Fluid under pressure is utilized to strip a can body from a metal working punch at the conclusion of a metal working stroke. The punch includes a valve member which is maintained in a closed position covering a stripping fluid outlet in a valve chamber before the end of the metal working stroke. The valve member is maintained in the closed position by a pneumatic bias applied to the end of the valve member opposite the end of the punch. At the conclusion of the metal working stroke, the can body is domed upwardly toward the valve member so as to engage a projection extending from the valve member thereby forcing the valve member away from the end of the punch and opening the outlet in the valve chamber. This permits the stripping fluid to pass through the valve chamber outlet into contact with the interior of the container body thereby stripping the body from the punch.
Inventors
- 👤 G Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:40
CPC Classifications
B; B21; B21D; B21D45/00; B21D45/02; B21D22/00; B21D22/20; B21D22/28; B21D22/30
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
166 words
In an apparatus for forming an integral can body having at least one drawing, sizing and/or wall ironing die, a can body doming die, a punch for carrying a blank or cup into metal working engagement with said ironing die and said doming die during a metal working stroke, the improvement residing in a system for stripping the can body from said punch at the end of said metal working stroke comprising: a source of stripping fluid under pressure; a stripping passageway coupled to said source and extending through said punch, said passageway having an outlet communicating with the end of said punch; valve means for closing said outlet; and bias means for maintaining said vlave in the closed position during said metal working stroke; said valve means including actuating means extending into a position adjacent said can bottom so as to be actuated by the can bottom during doming thereby opening said outlet and releasing said fluid for stripping the can body from said punch.
Claim 2
Dependent Claim
166 words
In an apparatus for forming an integral can body having at least one drawing, sizing and/or wall ironing die, a can body doming die, a punch for carrying a blank or cup into metal working engagement with said ironing die and said doming die during a metal working stroke, the improvement residing in a system for stripping the can body from said punch at the end of said metal working stroke comprising: a source of stripping fluid under pressure; a stripping passageway coupled to said source and extending through said punch, said passageway having an outlet communicating with the end of said punch; valve means for closing said outlet; and bias means for maintaining said vlave in the closed position during said metal working stroke; said valve means including actuating means extending into a position adjacent said can bottom so as to be actuated by the can bottom during doming thereby opening said outlet and releasing said fluid for stripping the can body from said punch.
Claim 3
Dependent Claim
41 words
The apparatus of claim 1 wherein said bias means comprises: a biasing pneumatic source; and a pneumatic passageway extending through said punch from said source and into communication with said valve means for biasing said valve means to the closed position
Claim 4
Dependent Claim
16 words
The apparatus of claim 2 wherein said pneumatic passageway extends along the axis of said punch.
Claim 5
Dependent Claim
20 words
The apparatus of claim 3 including a plurality of said strIpping fluid passageways located radially outwardly from said pneumatic passageway.
Claim 6
Dependent Claim
41 words
The apparatus of claim 1 wherein said punch comprises a chamber communicating with an outlet from said stripping fluid passageway, said valve means adapted to reciprocate in said chamber from a position closing said outlet to a position opening said outlet.
Claim 7
Dependent Claim
46 words
The apparatus of claim 5 wherein said actuating means of said valve means comprises a projection extending toward the end of said punch, the end of said projection being engaged by the central portion of a domed can body bottom so as to open said valve.
Claim 8
Dependent Claim
41 words
The apparatus of claim 6 wherein said punch includes a substantially cylindrical chamber, said valve means including a substantially cylindrical portion mating with said chamber, the axis of said cylindrical chamber and said cylindrical portion being substantially coaxial with said punch.
Claim 9
Dependent Claim
50 words
The apparatus of claim 7 wherein said chamber is formed in part by a restriction adjacent the end said punch, said projection extending through the opening formed by the restriction, said restriction preventing said valve means from leaving said chamber in the absence of a can body on said punch.
Claim 10
Dependent Claim
14 words
The apparatus of claim 2 wherein said stripping fluid source comprises a pneumatic source.
Claim 11
Dependent Claim
24 words
The apparatus of claim 2 wherein the pressure generated by said stripping fluid source substantially exceeds the pressure generated by said biasing pneumatic source.
Claim 12
Dependent Claim
38 words
The apparatus of claim 9 wherein the pressure of said stripping fluid source lies in the range of 80-120 p.s.i. and the pressure of said biasing means pneumatic source lies in the range of 5 to 20 p.s.i.
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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |