Method of and an apparatus for manufacturing elongated curved tu

Details Method of and an apparatus for manufacturing elongated curved tu Method of and an apparatus for manufacturing elongated curved tu

1977-09-22

1979-01-23

Keenan, Michael J.

Metal deforming

By use of non-deforming work-gripping clamp and relatively...

Plural or complex apparatus

72323, 72369, 72389, 72466, B21D 706, B21D 900

Patent

active

041353803

ABSTRACT:
An apparatus for manufacturing elongated curved tubular elements sequentially clamps longitudinally spaced end portions of a straight elongated tubular section, confines a central portion of the tubular section intermediate the clamped end portions between two dies, applies forces to at least one of the dies to displace the same and thus also the central portion of the tubular section in a predetermined direction and to a given extent with respect to the clamped end portions so that substantially S-shaped transitory portions of deformed cross-sectional shapes develop between the clamped end portions and the central portion of the tubular section, and restores the cross-sectional shapes of the transitory portions preparatory to sequential retraction of the dies and unclamping of the end portions of the tubular section by means of at least one mandrel which is introducible into the tubular section through at least one of the end portions thereof for passage into and through at least one of the transitory portions of the tubular section.

REFERENCES:
patent: 1748158 (1930-02-01), Walp
patent: 2044322 (1936-06-01), Oliver et al.
patent: 3000424 (1961-09-01), Weise

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