Structure of card punch

Details Structure of card punch Structure of card punch

1995-01-09

1996-11-19

Jones, Eugenia

Cutting

With receptacle or support for cut product

83549, 83618, 83629, 83687, 412 16, 412 38, B26F 114

Patent

active

055751881

ABSTRACT:
A card punch of the type having a rectangular hole punching unit driven by an operating handle through a transmission shaft to punch rectangular holes on loose leaves, the improvement comprising two driven gears meshed with two drive gears at two opposite ends of the transmission shaft, a sliding bar driven by the driven gears to force circular punching elements into holes on locating frames, which are fixed to a guide plate between two upright end plates of the base of the card punch, to punch holes on paper being inserted into the locating frames.

REFERENCES:
patent: 1049676 (1913-01-01), Cousins et al.
patent: 2562678 (1951-07-01), Okumura
patent: 3060780 (1962-10-01), Stuckens
patent: 4077288 (1978-03-01), Holland
patent: 4645399 (1987-02-01), Scharer
patent: 4872796 (1989-10-01), Hsieh et al.
patent: 5143502 (1992-09-01), Kaufmann et al.
patent: 5163350 (1992-11-01), Groswith, III et al.
patent: 5211522 (1993-05-01), Ho

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