Rotary draw tube bender

Details Rotary draw tube bender Rotary draw tube bender

2008-04-02

2010-06-29

Ross, Dana (Department: 3725)

Metal deforming

By deflecting successively-presented portions of work during...

By use of work-contacting wiper and moving, work-holding form

C072S158000, C072S482700

Reexamination Certificate

active

07743636

ABSTRACT:
The invention is a rotary draw bending machine and process for bending materials such as tubes or pipes into precise bends. A spindle holds a bending die, and a radial arm holds a counter-die. The spindle and arm are simultaneously rotated in opposite directions by a dual hydraulic drive controlled by an electro-hydraulic control system with foot pedal controls. The bend angle is preset by a protractor-like dial and limit switch mechanism. The radial arm has a slide track to align the counter-die with the bending die. The ratchet mechanism has teeth to allow incremental advancement of the counter-die when aligning it with its bending die to accurately set the gap between the dies. The machine is used with a wide variety of dies to bend a wide variety of workpiece diameters. The ratchet mechanism preferably includes a fine tuning device to provide an infinite range of alignment positions.

REFERENCES:
patent: 3205690 (1965-09-01), Roessler, Jr.
patent: 5689988 (1997-11-01), Schwarze
patent: 2005/0263990 (2005-12-01), Clute
Various pages of Baileigh Brochure published in May 2005, showing various tube bending machines with conventional die positioning mechanisms and machine controls with foot pedals.

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