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Expired
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Albert Francois
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Individual
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Individual
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Publication of GB190827691ApublicationCriticalpatent/GB190827691A/en
27,691. Francois, A. Dec. 1, [date applied for under Section 91 of Patents &c. Act, 1907]. Rock drills.-The cylinder wall of a percussive rock drill or other tool is formed with two annular grooves c, e connected with the inlet b and outlet d. The admission groove c communicates alternately with two series of ports i,j in the piston leading to the cylinder ends. The exhaust groove communicates alternately with the ports i and with the space created behind the piston by the forward stroke. The rotating-gear shaft l is arranged in the interior k of the piston.
GB190827691D1908-12-011908-12-19Improvements in Compressed Air Hammers.
ExpiredGB190827691A
(en)
Improvements in or in connection with Direct Acting Engines Applicable for Coal Cutting, Mining, Drilling, Tunnelling, Stamping Ore, Pile Driving, and the like.