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Expired
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John Henry Holman
James Miners Holman
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Individual
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Individual
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Publication of GB190709244ApublicationCriticalpatent/GB190709244A/en
9 2 4 4. Holman, J. H., and Holman, J.M. April 20 Rock drills.-A tool-holder or chuck for use in rock drills comprises a slotted piston-rod end a holding a half-round bushing c between which and a pad d the drill is clamped. The pad has lateral lugs e provided with holes f through which passes a U-bolt h holding nuts i and fixed by a wedge j. The slot for the pad and also the pad and separate half bushing extend to the end of the shank.
GB190709244D1907-04-201907-04-20Improvements in Chucks or Tool Holders of Rock Drills
ExpiredGB190709244A
(en)