Patent US3797431A successfully refreshed from Google Patents.
US3797431A
Expired / Lapsed
US
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Method of manufacturing the body of a neck-in can and an apparatus used therefor
Assignee: Daiwa Can Co Ltd
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Filing: 1972-07-05
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Granted: 1974-03-19
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Expires: 1992-07-05
Abstract
Abstract In the manufacture of the body of an ordinary neck-in can, the metal blank obtained from the metal sheet is subjected to drawing and ironing to form a cylindrical body with a bottom end, which is then subjected to trimming along the peripheral edge of the upper opening whereby the burr projected from the edge by trimming is crushed down before said cylindrical body is passed to the subsequent step. An apparatus for crushing down the burr is also provided. In this apparatus the burr is crushed down by means of the relative rotary movement between said cylindrical body having the burr formed and a roller provided for breaking down said burr.
Inventors
- 👤 T Yoshimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:01
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/26; B21D51/2615; B21D51/2638; Y; Y10; Y10S; Y10S83/00; Y10S83/914
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
152 words
In a method for manufacturing a metallic can which includes subjecting a metal blank to drawing and ironing steps to form an elongated cylindrical thin-walled body having a bottom at one end and an opening at the other end, said opening being defined by an encircling edge on said body wall at said other end, and then trimming the edge portion of said body at said other end to provide said body wall with a predetermined uniform height, the improvement which comprises pinching the outer periphery of the trimmed edge portion of said body wall between cooperating rotating surfaces to crush down toward said body wall any burr produced at said edge during trimming and extending radially and outwardly from said body wall and thus form on said body wall adjacent said edge surface a smooth sloped surface inclined inwardly from the body wall outer surface and merging with said edge surface.
Claim 2
Dependent Claim
152 words
In a method for manufacturing a metallic can which includes subjecting a metal blank to drawing and ironing steps to form an elongated cylindrical thin-walled body having a bottom at one end and an opening at the other end, said opening being defined by an encircling edge on said body wall at said other end, and then trimming the edge portion of said body at said other end to provide said body wall with a predetermined uniform height, the improvement which comprises pinching the outer periphery of the trimmed edge portion of said body wall between cooperating rotating surfaces to crush down toward said body wall any burr produced at said edge during trimming and extending radially and outwardly from said body wall and thus form on said body wall adjacent said edge surface a smooth sloped surface inclined inwardly from the body wall outer surface and merging with said edge surface.
Claim 3
Dependent Claim
47 words
A method according to claim 1 in which subsequent to pinching the trimmed edge portion of said body wall, said trimmed edge portion is subjected to necking-in followed by outward expansion of a part of said necked-in portion to form a flange on said body other end.
Claim 4
Dependent Claim
39 words
A method according to claim 2 in which subsequent to pinching the trimmed edge portion of said body wall and prior to necking-in and expansion of same, there is applied a printed coating to the surfaces of said body.
Claim 5
Dependent Claim
31 words
The method of claim 1 wherein said smooth sloped surface is formed such as to slope at an angle of about 10* to about 15* with the body wall outer surface.
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |