Pipe-bending machine mandrel

Details Pipe-bending machine mandrel Pipe-bending machine mandrel

2008-01-10

2009-08-25

Jones, David B (Department: 3725)

Metal deforming

Tool and/or tool holder

Including flexible or yieldable tool or support

C072S466200, C072S478000

Reexamination Certificate

active

07578160

ABSTRACT:
A pipe-bending machine mandrel includes a rigid member (5), inserted inside a pipe (T) which has an internal dimension Di and can tilt in a bending operation with a mean radius Rm as measured between the rotation center (O) of a bending die and the longitudinal axis (l) of the pipe (T). The rigid member (5) has a proximal side profile with respect to the rotation center (O) and includes a concave intermediate portion as generated by a radius Rci, and a distal side profile with respect to the rotation center (O) that includes two convex, divided, end portions as generated by respective radius Rce, where Rci=Rm−(Di/2)+t, and Rce=Rm+(Di/2)−t, t being a term varying according to the accuracy of the dimensional characteristics of the pipe and of the curve to be obtained.

REFERENCES:
patent: 2444907 (1948-07-01), Attridge
patent: 3490259 (1970-01-01), Cwik
patent: 4123930 (1978-11-01), Hill et al.
patent: 4671096 (1987-06-01), Crosby, Jr.
patent: 5909908 (1999-06-01), Furuse
patent: 7272922 (2007-09-01), Fahrion
patent: 2006/0053854 (2006-03-01), Nakazato
patent: 1090933 (1960-10-01), None
patent: 08294731 (1996-11-01), None
European search report dated Ju. 10, 2008.

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