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William Frederick Beardshaw
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Individual
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Individual
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Publication of GB189808012ApublicationCriticalpatent/GB189808012A/en
8012. Beardshaw, W. F. April 4. Drills toolholders. -A twist drill is formed by twisting a bar of the section shown in Fig. 2. The bar has ribs a to form a grinding-line on the finished drill. The upper end b of the drill is untwisted, and fits between the jaws d of a holder c which can be easily secured in a machine. The upper end of the drill may have a projection f to fit an aperture in the shank, to transfer torsional stress from the jaws to the shank.
GB189808012D1898-04-041898-04-04Improvements in Drills and in Holders therefor.
ExpiredGB189808012A
(en)