Hollow filament with crimp for use in spiral binding
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United States of America Patent
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Oct 19, 1999
Grant Date -
N/A
app pub date -
Aug 4, 1997
filing date -
Aug 4, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Multiple sheets spiral bound together as a unit by a continuous filament. The sheets have a plurality of closely spaced perforations aligned along an edge thereof. The filament is an elongated rod-like member having an outer surface and a centrally-located longitudinal axis. The filament is flexible and is disposed in spiral configuration through the perforations. The filament additionally comprises an inner surface defined by an internal elongate passage extending therethrough. The internal opening facilitates crimping of the inventive filament after it has been spiraled into a plurality of closely spaced perforations aligned along an edge of a stack of sheets. The internal opening in the filament also provides improved control over the outer dimension of the filament during manufacture.
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