Rotary tool with two stages of epicyclic gears - has one slidable longitudinaly for low speed and free rotation while engaged with planet wheel carrier for fast running

摘要

The power driven rotary tool is provided with two stages of epicyclic gears in tandem. The internal gear around one of the stages is mounted so as to be rotatable, and movable longitudinally whilst in engagement with its associated planet gears, the internal gear being locked to the casing of the tool. One extreme longitudinal direction of movement is for low speed running of the tool and is free to rotate in the other extreme longitudinal position whilst in engagement with teeth upon the planet gear carrier of one of the stages for high speed running of the tool.