Mandrel for bending tubes

Details Mandrel for bending tubes Mandrel for bending tubes

1977-11-21

1978-11-07

Larson, Lowell A.

Metal deforming

Tool and/or tool holder

Including flexible or yieldable tool or support

B21D 903

Patent

active

041239300

ABSTRACT:
A flexible mandrel for use in bending tubes and especially for producing tight bends in thin wall, high strength metal tubing. The mandrel comprises a series of ball members each of which is adapted to nest within the preceding ball of the series as the mandrel is flexed. The balls are free to rotate transversely and to slide longitudinally on a series of rigid link members which are flexibly interconnected. The balls and links are so constructed that as the mandrel is flexed, each ball pivots around a point located at or near the geometrical center of its outer curved surface.

REFERENCES:
patent: 1683573 (1928-09-01), Mueller et al.
patent: 1978452 (1934-10-01), Flodin
patent: 2776697 (1957-01-01), Zerlaut
patent: 3190106 (1965-06-01), Spates
patent: 3286503 (1966-11-01), Garrett
patent: 3315516 (1967-04-01), Sassak
patent: 3408850 (1968-11-01), Maier et al.
patent: 3415107 (1968-12-01), Ruscitti
patent: 3455142 (1969-07-01), Roberts

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