Metal deforming – By relatively movable offset tool-faces – With tool motion in fixed path
Patent
1997-05-30
1998-09-29
Jones, David
Metal deforming
By relatively movable offset tool-faces
With tool motion in fixed path
72441, 72446, B21D 502
Patent
active
058132732
ABSTRACT:
A press brake for bending a work sheet wherein an upper tool holder is mounted at a lower end of a ram to mount an upper tool and a bending angle of a work sheet is determined by three points of spaced shoulders of a lower tool and a lower tool bottom. The press brake includes a group of pins as pressure transmission members, arranged at symmetrical positions from a machine center line in the upper tool. A space is provided between the tops of some of the pins and a press block. A series of spacers is mounted on a chain mechanism for putting the spacers into and out from the space between the press block and the pins. The effective length of the upper tool is automatically changed corresponding to the bending length of the work sheets so as to achieve an efficient bending of various length work sheets and preventing unequal bending.
REFERENCES:
patent: 3682465 (1972-08-01), Hanni
patent: 4732032 (1988-03-01), Kogure
patent: 4894015 (1990-01-01), Houston
patent: 5009098 (1991-04-01), Van Merkssteijn
patent: 5067340 (1991-11-01), MacGregor
patent: 5097694 (1992-03-01), Haennit et al.
patent: 5103665 (1992-04-01), Van Merksteijn
Patent Abstracts of Japan, Voltage. 16, No. 557 (M-1340)-Considered particulary relevant Nov. 27, 1992.
Jones David
Maru Kikai Kogya Co., Ltd.
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