E/MJ : engineering and mining journal . t it had a lockingkey for holding the steel in the chuck, which featurewas abandoned in the Model 6, Fig. 22, already re-ferred to, and later types. Fig. 23 shows the rotations of various makes ofhammer drills, which it will be noted correspond inmain essentials to the Leyner type. In Fig. 24 is shown the No. 7 Leyner drill, which may be said tolie the real father of all present-day hammei includes in its design the Sergeant release rota-tion feature, the rifle-bar rotating-sleeve chuck fea-ture, the water-and-air feature, and the first auto-ma
E/MJ : engineering and mining journal . t it had a lockingkey for holding the steel in the chuck, which featurewas abandoned in the Model 6, Fig. 22, already re-ferred to, and later types. Fig. 23 shows the rotations of various makes ofhammer drills, which it will be noted correspond inmain essentials to the Leyner type. In Fig. 24 is shown the No. 7 Leyner drill, which may be said tolie the real father of all present-day hammei includes in its design the Sergeant release rota-tion feature, the rifle-bar rotating-sleeve chuck fea-ture, the water-and-air feature, and the first auto-matic lubricator, as well as inclosed machine throt-tle construction, and one piece solid fiont head, and,finally, split front head with through bolt retained bythe front head cap. It is interesting to note the varia-tions of features of these designs as found in othermakes of machines, as shown in Fig. , includingthe mounted hammer drills, self-rotating hand-ham-mer drills, and stoper drills, with their air-feed at-tachments as
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries
