A Debris-removing Device for Percussive Rock Drills.

摘要

24,109. Mairet, G. Dec. 15. Percussive drills.-In a percussive rock drill in which the debris is removed by the exhaust air or steam, the exhaust ports j open to a chamber c so provided with a regulating- throttle k that the scavenge channels i are always free. The exhaust passes to an annular groove hand through openings g and the bore f in the bit e. The rocking valve m has a push-button n, by depression of which air is admitted to the front of the piston band passed into the scavenge channels in a steady stream. In a modification, the groove h and openings g are opposite grooves and openings in the end of the pistonrod d.