Novel flexible magnet for use in small dc motors
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United States of America Patent
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-
Nov 21, 1989
Grant Date -
N/A
app pub date -
Nov 16, 1987
filing date -
Nov 16, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A die head is disclosed for use on an extruder die in which a plate-like structure having an elongated slot through which extrudate is extruded. the slot has a central area which is narrower than the height at each end of the elongated slot. The elongated slot also is arcute in shape, and the central area to each end portion is a mirror image of one another. The die head produces an extrudate which is uniform in thickness throughout a cross-section taken normal to the direction of extrusion, but the extrudate is bowed or arcuate in shape. The combination of a metallic shell and a flexible arcuate magnetic material is also disclosed in which the extruded flexible magnetic strip material is curled within the cylindrical shell such that both the peripheral exterior surface and the peripheral interior surface of the flexible magnetic material is flat in axial cross-section.
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