DRIVE TOOL Russian patent published in 2013 - IPC B25F5/00 

FIELD: process engineering.

SUBSTANCE: set of inventions relates to hand-held drive tools. Proposed tool comprises power supply 115, rpm changeover mechanism 117 and tool adapter 113. Said rpm changeover mechanism 117 comprises first and second rotary shafts 123, 125 arranged in parallel, first electric power transfer path P1 supported by first gearing and first coupling 141 and second electric power transfer path P2 supported by second gearing and second coupling 145. Power transfer line is switched when transfer mechanisms are engaged by couplings 141, 145 and shifted from power transfer position and power transfer interrupt position depending upon load applied to tool 113. Mechanism 117 comprises rpm changeover fixing mechanism 1511, 251, mechanism 161 to prevent rpm changeover and mechanism 191 to adjust preset changeover magnitude or changeover mechanism 181.

EFFECT: smooth speed changeover.

26 cl, 36 dwg