Press brake tool and tool holder

Metal deforming – Tool and/or tool holder – Having unitary tool-face

Reexamination Certificate

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Details

C072S481100, C072S482100, C072S482920

Reexamination Certificate

active

06848291

ABSTRACT:
A press brake tool and tool holder. The tool is provided having a body that terminates downwardly in a work piece engaging surface and that includes a tang extending upwardly from the body for reception in a tool holder. The tang has a first wall defining a vertical surface for engagement with a cooperating vertical surface of a tool holder, and a second wall on the reverse side of the tang that defines an arcuate, concave surface engagable with a clamp of the tool holder. The concave surface includes an upper contact surface tangent to a plane that is downwardly convergent with respect to the vertical surface such that a force delivered to the contact surface includes an upward component tending to lift the tang into the tool holder. The upper contact surface may be formed on a first radius about a horizontal axis and is tangent to a first plane that is downwardly convergent with respect to said vertical surface. The concave surface may include a lower contact surface formed on a second, larger radius about a horizontal axis and that is tangent to a second plane that is upwardly convergent with respect to said vertical surface, the angle between the vertical and said first plane being greater than the angle between the vertical and the second plane so that the clamp delivers a net upwardly force to the tool.

REFERENCES:
patent: 2755758 (1956-07-01), Johansen
patent: 4993255 (1991-02-01), Treillet
patent: 5460027 (1995-10-01), Takahashi
patent: 5619885 (1997-04-01), Kawano et al.
patent: 5642642 (1997-07-01), Kawano
patent: 5782308 (1998-07-01), Latten et al.
patent: 6138492 (2000-10-01), Vining et al.
patent: 6151951 (2000-11-01), Kawano
patent: 6494075 (2002-12-01), Pelech, Jr.
patent: 6564611 (2003-05-01), Harrington et al.
patent: 237800 (1987-09-01), None
patent: 2691652 (1992-05-01), None

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