US Patent 7308814 Method for perforating a sheet
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Patent Inventor Names
Wolfgang Gassner0
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Patent abstract
A method for perforating a sheet (1) with the aid of a stamp (3) and a matrix (2) is described, the sheet (1) being elongated before the hole punching in accordance with the setpoint diameter in the hole boundary area through bulging of the hole area. In order to be able to stamp flat perforated sheets, it is suggested that the sheet (1) be countersunk through embossing in the hole boundary area on the side diametrically opposite the matrix (2) after the hole punching to equalize internal tensions.
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US Patent 07308814 Method for perforating a sheet US Patent 7308814 Method for perforating a sheet
Infobox
Patent Number
073088140
Patent Number
73088140
Edits on 31 Mar, 2023
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Patent Jurisdiction
Patent Number
073088140
Date of Patent
December 18, 2007
0Patent Application Number
112495800
Date Filed
October 13, 2005
0Official Website
Patent Primary Examiner
Edits on 17 Jun, 2022
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US Patent 07308814 Method for perforating a sheet
Infobox
Is a
Patent jurisdiction
Patent number
07308814
Date of patent
December 18, 2007
Patent application number
11249580
Date Filed
October 13, 2005
Patent primary examiner
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