Shear assembly for a roll forming machine

Details Shear assembly for a roll forming machine Shear assembly for a roll forming machine

2007-04-17

2007-04-17

Ashley, Boyer D. (Department: 3724)

Cutting

Means to drive or to guide tool

Sequential cutting motions

C083S628000, C083S638000, C083S694000, C083S454000, C083S646000

Reexamination Certificate

active

11253270

ABSTRACT:
A shear assembly for a roll forming machine which forms a rain gutter. A pair of coplanar blade members separated along a vertical line are caused to first move vertically downwardly, then have their lower ends pivot outwardly and, finally, have their upper ends pivot outwardly. The last motion is accomplished with enhanced mechanical advantage to cut through multiple layers of metal at the upper end of the gutter.

REFERENCES:
patent: 786236 (1905-03-01), Ross
patent: 861122 (1907-07-01), John
patent: 1589657 (1926-06-01), Pels
patent: 1758019 (1930-05-01), Williams
patent: 3656388 (1972-04-01), Valente
patent: 4981060 (1991-01-01), Knudson
patent: 6510773 (2003-01-01), Hart et al.
patent: 6659939 (2003-12-01), Moll et al.

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