Mandrel for bending

Details Mandrel for bending Mandrel for bending

2007-05-22

2007-05-22

Jones, David (Department: 3725)

Metal deforming

Tool and/or tool holder

Including flexible or yieldable tool or support

C072S466000, C072S369000

Reexamination Certificate

active

10869485

ABSTRACT:
A mandrel for bending which inhibits generation of irregularities on the inside of the bend is provided. The mandrel comprises a plurality of plugs in the form of discs and a through-hole is created substantially in the center of each plug. A flexible member is inserted through the through-holes of the respective plugs. One end of the flexible member is fixed to a shank so that the plugs are connected to the shank in series. Each plug is provided with a flat slant surface that descends from about the center of the plug toward the outer periphery of the plug. A lock hole is formed in parallel to the through hole in each plug and a flexible lock member, one end of which is fixed to the shank, is passed through the lock holes of the respective plugs.

REFERENCES:
patent: 1748158 (1930-02-01), Walp
patent: 1856597 (1932-05-01), St Jarnstrom
patent: 2451717 (1948-10-01), Check, Sr.
patent: 2776697 (1957-01-01), Zerlaut
patent: 3105538 (1963-10-01), Spates
patent: 3417601 (1968-12-01), Werner
patent: 3572083 (1971-03-01), Schmitt
patent: 4378689 (1983-04-01), Molz
patent: 4647255 (1987-03-01), Pow
patent: 6244092 (2001-06-01), Grobbenhaar
patent: 562 804 (1932-10-01), None
patent: 6-41921 (1994-06-01), None
patent: 7-290156 (1995-11-01), None

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