Bending die and ram assembly for tube bending machine

Details Bending die and ram assembly for tube bending machine Bending die and ram assembly for tube bending machine

1989-06-12

1990-11-06

Jones, David

Metal deforming

By relatively movable offset tool-faces

With tool motion in fixed path

72482, B21D 706

Patent

active

049675850

ABSTRACT:
An improved bending die and ram assembly is provided for use in a tube bending machine used for bending metal tubing of the type used, for example, in vehicle exhaust systems and the like. The machine features a bending die having a convexly curved die face for bending engagement with a metal tube supported by a pair of backshoe dies mounted on an outwardly pivoting pair of back gates. The bending die is advanced by the ram assembly along a line extending between the back gates to engage and bend the metal tube, with the back gates swinging outwardly in opposite directions as the tube is bent. The ram assembly utilizes retractor hooks which cooperate with lugs projecting from the underside of the bending die to permit the die to be attached and detached from the ram assembly in a drop-in, lift-out manner that does not require tools. Following a bending operation, the retractor hooks engage the lugs to pull the bending die away from bent tube during retraction of the ram assembly.

REFERENCES:
patent: 1662428 (1928-03-01), Lowe
patent: 1765807 (1930-06-01), Thomas
patent: 3388574 (1968-06-01), Ignoffo
patent: 3429157 (1969-02-01), Huth
patent: 3499309 (1970-03-01), Gregg
patent: 3727449 (1973-04-01), Johnston
patent: 3756058 (1973-09-01), Hamkins et al.
patent: 4206629 (1980-06-01), Grimaldo
patent: 4299113 (1981-11-01), Belotti
patent: 4833907 (1989-05-01), Grimaldo

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