Hole punch element

Cutting – Tool or tool with support – Joint or connection

Reexamination Certificate

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Details

C083S633000, C083S690000, C083S689000

Reexamination Certificate

active

08061252

ABSTRACT:
A hole punch device that reduces the force required to create a hole in papers or other sheet media. A punch element of the hole punch device includes a locally sloped or indented floor to create a bend in the sheet media as it is punched to create an enlarged, oval hole. The punch pin may include an expanding sleeve surround the pin that forms a larger diameter during the cutting stroke and springs back to a smaller diameter during a pull out stroke. A coiled torsion return spring is positioned remotely from and non-coaxially with the punch pin. A keyed pin and support frame arrangement ensures a predetermined rotational orientation of the pin for sequential cutting for reduced cutting force. A long lead-in surface in the frame helps installing sheet media into the feed slot of the punch element.

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Extended European Search Report issued by the European Patent Office, dated Nov. 12, 2009.

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