Upper tool for press brake

Details Upper tool for press brake Upper tool for press brake

1995-04-28

1997-11-11

Jones, David

Metal deforming

Tool and/or tool holder

Having unitary tool-face

72462, B21D 3704

Patent

active

056851910

ABSTRACT:
In an upper tool for a press brake formed with an inclined surface (9S) narrowed upwardly at an upper portion thereof and an engage groove (9G) formed under the inclined surface (9S). The inclined surface (9S) is brought into contact with an inclined surface of an upper tool clamp member (11), when the upper tool is clamped between an upper tool holder body (5) and an upper tool clamp member (11), in such a way that clamping force can be further increased when the upper tool is engaged with a die (63). Further, in an upper tool holder apparatus for a press brake, the pivotal upper tool clamp member (211) is formed with an engage projection (211P) for engaging a drop prevention groove (205G) formed in the upper tool (205). The upper tool holder apparatus further comprises a clamp operation lever (215) which can be selectively moved to a clamp position "A" at which the clamping force can be applied to the upper tool clamp member (211) from a clamping force generating spring (213) to clamp the upper tool tightly; an unclamp position "B" at which the clamping force can be reduced to allow the upper tool to be adjustably shifted horizontally, and an exchange position "C" at which the upper tool clamp member (211) can be moved way from the upper tool to allow the upper tool to be exchanged vertically with another one.

REFERENCES:
patent: 4534203 (1985-08-01), Cros
patent: 4993255 (1991-02-01), Treillet
patent: 5022256 (1991-06-01), Van Der Meulen
patent: 5065610 (1991-11-01), Yonezawa
patent: 5245854 (1993-09-01), Bruggink et al.
patent: 5390527 (1995-02-01), Kawano
patent: 5511407 (1996-04-01), Kawano
patent: 5513514 (1996-05-01), Kawano
A Japanese Patent Abstract, vol. 12, No. 145 (M693).
An English Language Abstract of JP 6-23436.
An English Language Abstract of JP 5-317973.
An English Language Abstract of JP 3006018.
Patent Abstracts of Japan, vol. 18, No. 227 (M-1597) of Apr. 25, 1994 and Japanese Patent Document No. 06-023436.
Patent Abstracts of Japan, vol. 8, No. 146 (M-307) of Jul. 7, 1984 and Japanese Patent Document No. 59-042124.
Patent Abstracts of Japan, vol. 18, No. 168 (M-1580) of Mar. 22, 1994 and Japanese Patent Document No. 05-0337553.

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