摘要：

1. A set screw `comprising a cupped point, the wall of said point being in the form of an annular Wedge whereof the outer surface denes generally the frustum of a cone References Cited in the le of this patent UNITED STATES PATENTS 1,107,177 Noble Aug. 11, 1914 2,201,087 Hallowell May 14, 194() 2,235,435 Koester Mar. 18, 1941 2,239,352 Cherry Apr. 22, 1941 2,245,525 Dicely June 10, 1941 2,727,256 Moore Dec. 20, 1955 `2,778,265 Brown Jan. 22, 1957 FOREIGN PATENTS 648,504 Great Britain Jan. 3, 1951

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