Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . Fig. 4176 has two interchangeable shafts C Z fordrills and countersinks i[ K, fed respectively bythumbscrews / o n. Either is secured in place bythe screw-cap E. The pawl is caused to engage theratchet by pressure of a spring in the handle B, be-ing prevented from falling out while one shaft issubstituted for the other by a screw F enteringa slot in the pawl. Ra
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . Fig. 4176 has two interchangeable shafts C Z fordrills and countersinks i[ K, fed respectively bythumbscrews / o n. Either is secured in place bythe screw-cap E. The pawl is caused to engage theratchet by pressure of a spring in the handle B, be-ing prevented from falling out while one shaft issubstituted for the other by a screw F enteringa slot in the pawl. Ratchet-drill. A drill whose rotatory move-ment is derived from a ratchet and pawl actuatedby a lever. The movement is intermittent, the paivlengaging the teeth only when the lever is pushed inone direction, and slipping over them when drawnbackward. In some, however, a continuous rotarymotion is imparted to the drill. Sinclairs (Fig. 4177) is of this kind. The spindleA has a ratcheted shoulder i^which holds the foikedhandle EE and disk handle DD in place, and in Fig.
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Keywords: ., bookcentury1800, booksubjectin, booksubjectmechanicalengineering
