Patent · US Expired

Apparatus for making holes in thick stacks of paper

US4509396A · kind A · utility

14Cited by

10References

7Claims

0Family size

Assignee

BIELOMATIC LEUZE GMBH + CO KG · DE

Inventors

Walter Schall · Neuffen, DE
Guido Negro · Neuffen, DE
Martin Hipp · Großengstingen, DE
Hans Albrecht · Waiblingen, DE

Key dates

Filing date	Apr 29, 1983
Grant date	Apr 9, 1985
Priority date	—
Expiry date	Apr 29, 2003

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T83/9425
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

A tool for punching relatively thick paper stacks, comprises a cylindrical, hollow punch with a cutting edge on its front outer edge. Processing takes place in the manner of a punching operation against a bearing surface, which has a hole corresponding to tool with a counterpunch arranged centrally therein. A blade is arranged in the resulting annular gap in order to separate punching waste which has been pressed into said annular gap and in order to permit the removal thereof.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.