Metal deforming – By use of non-deforming work-gripping clamp and relatively... – Plural or complex apparatus
Patent
1978-09-13
1981-01-06
Larson, Lowell A.
Metal deforming
By use of non-deforming work-gripping clamp and relatively...
Plural or complex apparatus
72306, 72384, B21D 504
Patent
active
042428980
ABSTRACT:
Machine for effecting bends of predetermined width and direction on the edges of a substantially-rectangular sheet of metal, comprises a combination of: a bending press having a C-form support structure carrying a lower bending counterblade, an upper, vertically displaceable blank-holder counterblade, and a pair of vertically displaceable bending blades having respective active parts lying in a common vertical plane substantially coplanar with a rear face of the blank holder counterblade; an iron hand including a vice supported on a carriage movable horizontally, perpendicular to the common vertical plane of the active portions of the bending blades, the lower jaw of the vice being rotatable about a vertical axis and the upper jaw being idle about a vertical axis and displaceable vertically to grasp a sheet to be bent between the jaws; and a positioning programmer, whereby, in use, a sheet of metal gripped by the vice is displaced by a value predetermined by the programmer into a position in which a first side to be bent projects between the counterblades by the desired width of the first bend, the upper blank-holder counterblade being moved vertically downwardly to grip the sheet, and the bending blades are displaced vertically to engage a desired active part thereof against the sheet and bend it in the desired upward or downward direction, the blank-holder counterblade is raised and, the sheet repositioned under control of the programmer and a further bend imparted, this being repeated to effect the required number of bends of desired width and direction on the first side, the sheet is then withdrawn to a position in which rotation of the lower jaw of the vice by a rotator effects rotation of the sheet through 90.degree. or 180.degree. as required to present a further side of the sheet to the bending press, the above actions being repeated to effect desired bending of each side.
REFERENCES:
patent: 1387603 (1921-08-01), McCabe
patent: 1449427 (1923-03-01), McCabe
patent: 2734552 (1956-02-01), Yonash
patent: 3192759 (1965-07-01), Pelton et al.
patent: 3731514 (1973-05-01), Deibele, Jr.
patent: 3786666 (1974-01-01), York, Jr.
patent: 3802246 (1974-04-01), Goff
patent: 4092840 (1978-06-01), Eckhold et al.
Kersey George E.
Larson Lowell A.
Salvagnini Transferica S.p.A.
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