Importance

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Abstract

Disclosed is an apparatus for bending a hollow double structured pipe, which is simple in construction, and is capable of putting into practice easily the continuous, two- or three-dimensional bending work. This bending apparatus for the hollow double-structured pipe is of such a construction that a fixed end side of the hollow double-structured pipe is fastened to a bending dies and a fixing dies; an intermediate part of the hollow double-structured pipe is slidably held by a shoe and a pressing dies; then an inner core metal is inserted into an inner pipe, while a tubular core metal is inserted into a gap between the inner pipe and the outer pipe; and the bending dies is rotated in the direction of the pipe-bending to thereby bend the hollow double-structured pipe, wherein a holding member is provided to be commonly butt-contacted to the open end faces of both inner and outer pipes; the holding member and a chuck fixed on the peripheral surface of the outer pipe, at the open end side of the hollow double-structured pipe, are connected each other through a long guide slot formed in the tubular core metal in such a manner that the tubular core metal can be made rotatable with respect to the inner core metal.

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First Claim