Driver bit for a recessed screw
作者： Katsumi Shinjo
DOI:
关键词:
摘要: A driver bit adapted to engage in a recess of recessed screw which is defined as coaxial superimposition two equilaterally triangular and cylindrical recesses each having arcuate vertices arranged with phase shift 60° about center axis the provide six engagable grooves driven vanes. The includes driving vanes valleys, vane being shaped conformity groove screw, valley interposed between adjacent screw.
lens.org 参考文章(6)
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