Magnetic support system for cable insertion tube

Details Magnetic support system for cable insertion tube Magnetic support system for cable insertion tube

1994-04-25

1995-08-08

Nguyen, Khanh P.

Plastic article or earthenware shaping or treating: apparatus

With direct application of magnetic force to manipulate...

425 67, 425 71, 425113, 425461, 264978R, 2642094, B29C 4790

Patent

active

054393639

ABSTRACT:
A ferromagnetic cable insertion tube is cantilevered from a polymeric conduit extruder and separates an electrical and/or optical cable being pulled through the conduit from the inner surface of the conduit until it has solidified. A d.c. current source is applied to a coil surrounding the cable insertion tube upstream of the extruder so as to induce a magnetic flux in the tube and create a north pole at the downstream free end of the tube and a south pole at the upstream free end of the tube. An array of magnets is assembled about the insertion tube at the downstream free end or north pole thereof. The magnets are arranged with their north poles confronting the north pole of the insertion tube so that the repulsive forces between the like poles magnetically levitate the free end of the insertion tube and keep it from sagging into contact with the extruded conduit.

REFERENCES:
patent: 2945258 (1960-07-01), Houston
patent: 3211818 (1965-10-01), Beckwith
patent: 3296344 (1967-01-01), Timmerman
patent: 3530536 (1970-09-01), Thorman
patent: 3538210 (1970-11-01), Gatto
patent: 3893465 (1975-07-01), Cheatwood
patent: 4086044 (1976-04-01), Sikora
patent: 4137025 (1979-01-01), Graves
patent: 4508500 (1985-04-01), French
patent: 4575326 (1986-03-01), French
patent: 5139402 (1992-08-01), Topf
patent: 5271786 (1993-12-01), Gorney et al.

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