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Improvements in the construction of pneumatic actions for automatic musical instruments, piano players and the like. Edgar Henry Dodds, November 14, 1921: GB171465-A (3 worldwide citation)

171,465. Dodds, E. H. Aug. 12, 1920. Actions.-In a pneumatic action as described in Specification 153,938, wherein a valve chamber 2 leading at 1 to the striking pneumatic is closed by an L-shaped cover-plate 3 having apertures 12, 13 closed alternately by a double-acting valve, a separate valve 15 ...


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Improvements in pneumatic actions for automatic musical instruments, piano-players, and the like. Edgar Henry Dodds, November 22, 1920: GB153928-A

153,928. Dodds, E. H. May 21, 1919. Actions.-A pneumatic action, Fig. 1, comprises a valve casing 1 having two of its sides closed by an L-shaped cover-plate 2 having air and exhaust ports 4, 3 respectively, adapted to be closed alternately by a single double-acting valve 5 pivoted at the angle of t ...


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