Die-protecting device used in bending an embossed metallic strai

Details Die-protecting device used in bending an embossed metallic strai Die-protecting device used in bending an embossed metallic strai

1999-06-11

2000-11-07

Larson, Lowell A.

Metal deforming

Tool and/or tool holder

Including flexible or yieldable tool or support

72369, B21D 901

Patent

active

061420050

ABSTRACT:
A die-protecting device used in bending an embossed metallic straight pipe with a small diameter and a thin wall is disclosed. Whereof a die core is placed in the straight embossed pipe to support and help the wall of the embossed pipe to bear bending force being scattered thereby and almost equally distributed to the whole wall and to get desired bending curvature. A pair of half-dies are put on and envelop the external wall surface of the embossed pipe to protect the embossed pipe. A flexible plastic pipe is slipped over the half-dies to protect the half-dies from loosening. A spiral spring is slipped over the plastic pipe, and a tension spring is slipped over the spiral spring. So that the bending force exerted on the half-dies, the embossed pipe and the plastic pipe can be more uniformly distributed, and the embossed pipe can be bent to et desired curvature.

REFERENCES:
patent: 2989109 (1961-06-01), Heimberger
patent: 5272905 (1993-12-01), Parlow et al.

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