An Improved Supporting Appliance for Rock and like Drills.

摘要

10,783. Rayner, G. H. May 6. Percussive drills.-A support for a percussive drill, of the type usually hand-supported, is carried wholly from a hole in the rock face. It comprises a tubular portion b fitted or driven into a hole in the rock face and a tail-piece a, from which the drill is suspended by a bracket e. A pawl on the bracket may engage with a rack on the tail - piece to prevent backward movement, and this may be used to give a forward feed operated by the reactions of the machine; or an eccentric or other silent feed may be provided.