Patent US3777601A successfully refreshed from Google Patents.
US3777601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Punching apparatus
Assignee: Individual
•
Filing: 1971-03-29
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Granted: 1973-12-11
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Expires: 1991-03-29
Abstract
Abstract A punching apparatus having a punch holder rigidly supporting two punches which at least partially overlap each other, and dies co-acting with their respective punch, at least one of the dies being movable away from its position in which it cooperates with its respective punch, while said punch objects into a perforation made in a workpiece by the same.
Inventors
- 👤 P Strandell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:21
CPC Classifications
B; B21; B21D; B21D28/00; B21D28/02; Y; Y10; Y10T; Y10T83/00; Y10T83/202; Y10T83/2092; Y10T83/22; Y10T83/2205; Y10T83/869; Y10T83/8745; Y10T83/8746; Y10T83/8748; Y10T83/8821; Y10T83/8828; Y10T83/8831; Y10T83/8832; Y10T83/8835; Y10T83/929; Y10T83/9411; Y10T83/9423; Y10T83/9425; Y10T83/9428; Y10T83/9432; Y10T83/9457; Y10T83/9473; Y10T83/9476
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
242 words
An apparatus for punching elements from a flat workpiece comprising a punch holder capable of moving towards and away from the workpiece and rigidly connected to at least two punches, actuating means for delivering impact forces to the punch holder with sufficient energy to carry out each punching operation, punch dies arranged to co-act with the punches, means for arresting movement of the punch holder immediately after an element has been punched free from the workpiece wherein at least one first punch for making a first perforation in the workpiece is located, when projected onto the workpiece, at least partially within the surface of projection of a second punch for free-punching the elements from the workpiece and projects beyond the free-punching punch through a distance which is substantially equal to the least distance which the first punch must be inserted into the workpiece in order to effect said perforation and further wherein the punch die of the first punch in its co-acting position with the first punch prevents by abutment via the workpiece facing the workpiece, free-punching of the elements to be punched out, and means for temporarily arresting the movement of the punch holder immediately after the first perforation is made in the workpiece wherein at least the die associated with the first punch can be moved away from its co-acting position with the first punch while the first punch projects into a perforation which it has made in the workpiece.
Claim 2
Independent Claim
242 words
An apparatus for punching elements from a flat workpiece comprising a punch holder capable of moving towards and away from the workpiece and rigidly connected to at least two punches, actuating means for delivering impact forces to the punch holder with sufficient energy to carry out each punching operation, punch dies arranged to co-act with the punches, means for arresting movement of the punch holder immediately after an element has been punched free from the workpiece wherein at least one first punch for making a first perforation in the workpiece is located, when projected onto the workpiece, at least partially within the surface of projection of a second punch for free-punching the elements from the workpiece and projects beyond the free-punching punch through a distance which is substantially equal to the least distance which the first punch must be inserted into the workpiece in order to effect said perforation and further wherein the punch die of the first punch in its co-acting position with the first punch prevents by abutment via the workpiece facing the workpiece, free-punching of the elements to be punched out, and means for temporarily arresting the movement of the punch holder immediately after the first perforation is made in the workpiece wherein at least the die associated with the first punch can be moved away from its co-acting position with the first punch while the first punch projects into a perforation which it has made in the workpiece.
Claim 3
Dependent Claim
35 words
An apparatus according to claim 1, characterized in that the punch die intended to co-act with the first punch iS capable of being removed in the direction of the working stroke of the punch holder.
Claim 4
Dependent Claim
31 words
An apparatus according to claim 1, characterized in that the punch dies are mounted on a punch die holder capable of moving transversely of the working stroke of the punch holder.
Claim 5
Dependent Claim
35 words
An apparatus according to claim 1, characterized in that said actuating means are capable of being reset to alternately impart to the punch holder energy adapted for punching said perforation and for free-punching an element.
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |