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Expired
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Heinrich Baum
Rudolf Gansen
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Publication of GB190611822ApublicationCriticalpatent/GB190611822A/en
11,822. Baum, H., a n d Gansen, R. May 21. Undercutting ; rock drills.-A percussive drill is so mounted that its tools produce a straight furrow when the machine is swung from side to side. The drill is mounted at g on a plate f, in which is also mounted a toothed wheel l, operated by a worm j and rigidly connected with a second wheel m, which meshes with the teeth of a curved slot d' in a guide-frame d. The frame d is also formed with a straight slot n, and the slots d', n cause the tool to move in the desired manner, when the machine is swung from side to side.
GB190611822D1906-05-211906-05-21Improvements in Apparatus for Cutting coal or the like.
ExpiredGB190611822A
(en)