Hook assembly with coated surfaces for sewing machine
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United States of America Patent
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Jul 29, 1997
Grant Date -
N/A
app pub date -
Feb 17, 1995
filing date -
Feb 24, 1994
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A hook assembly includes a bearing rib on a bobbin case basket or at least a surface layer thereof composed of a synthetic resin, such as a liquid crystal polymer, which has properties such that the amount of the rotating friction generated between such surface layer and an inner surface layer of a groove shaped bearing raceway in which the bearing rib is fitted is lower, with no industrial sewing machine oil therebetween than such industrial sewing machine oil where to be provided therebetween. The hook assembly thus has good durability without any lubrication being provided. Accordingly, oil staining of threads and sewing materials by a lubricant is avoided, and sewing quality is enhanced.
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