US3583266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shearing process
Assignee: Individual
•
Filing: 1969-04-02
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Granted: 1971-06-08
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Expires: 1989-04-02
Abstract
Abstract A shearing process which comprises the steps of placing a blank between a die tool and another die tool disposed opposite thereto which has the same contour as the former but is formed with a protrusion that has a horizontal plane portion at the top thereof; then moving the die tool and the protruded tool with respect to each other in the direction where the distance between the two is shortened thereby shearing off a part of the plate thickness of the blank by one of the two die members, and then actuating a knockout disposed adjacent said die tool or protruded tool so as to separate the shorn article from the blank.
Inventors
- 👤 Kazuyoshi Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:21
CPC Classifications
B; B21; B21D; B21D28/00; B21D28/02; B21D28/16; Y; Y10; Y10S; Y10S83/00; Y10S83/956; Y10T; Y10T83/00; Y10T83/04; Y10T83/0581; Y10T83/06; Y10T83/929; Y10T83/9411; Y10T83/9423; Y10T83/9425
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
115 words
A shearing process which comprises the stePs of: placing a blank between a die tool and another die tool disposed opposite thereto which has the same contour as the former but is formed with a protrusion that has a horizontal plane portion at the top thereof; then moving the die tool and the protruded die tool with respect to each other in the direction where the distance between the two tools is shortened, thereby shearing off a part of the plate thickness of the blank by one of the two die tools, and then actuating a knockout disposed adjacent said die tool or protruded tool so as to separate the shorn article from the blank.
Claim 2
Dependent Claim
115 words
A shearing process which comprises the stePs of: placing a blank between a die tool and another die tool disposed opposite thereto which has the same contour as the former but is formed with a protrusion that has a horizontal plane portion at the top thereof; then moving the die tool and the protruded die tool with respect to each other in the direction where the distance between the two tools is shortened, thereby shearing off a part of the plate thickness of the blank by one of the two die tools, and then actuating a knockout disposed adjacent said die tool or protruded tool so as to separate the shorn article from the blank.
Claim 3
Dependent Claim
31 words
A shearing process as defined in claim 1 wherein the protruded die tool is provided with a protrusion of the same inner contour as the inner contour of the die tool.
Claim 4
Dependent Claim
38 words
A shearing process as defined in claim 1 wherein the die tool is a punch and the protruded die tool is provided with a protrusion of the same outer contour as the outer contour of the die tool.
Claim 5
Dependent Claim
32 words
A shearing process as defined in claim 2 wherein the outer side of the protrusion is sloped so that the stock formed during the working can be removed outwardly along the slope.
Claim 6
Dependent Claim
55 words
A shearing process as defined in claim 1 which includes a protruding portion or a die tool adapted to protrude with the progress of the shearing operation which is provided on the facial, central part of the punch so as to promote the dishing or lifting-off of the stock and to facilitate the removal thereof.
Claim 7
Dependent Claim
55 words
A shearing process as defined in claim 1 which includes a protruding portion or a die tool adapted to protrude with the progress of the shearing operation which is provided on the front part of the die tool so as to promote the dishing or lifting-off of the stock and to facilitate the removal thereof.
References Cited (Backward Citations)
US2039842A
Cited
US2141492A
Cited
US2648383A
Cited
US2508758A
Cited
US3211034A
Cited
US3119292A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-07 | 1974-12-07 | 1975-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-07 | 1978-12-07 | 1979-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-07 | 1982-12-07 | 1983-06-08 | $7700.00 | Window Closed / Lapsed |