| US 7,489,856 B2 | ||
| Electrical device for automatically adjusting operating speed of a tool | ||
| William R. Haller, Bethlehem, Pa. (US) | ||
| Assigned to Nokia Corporation, Espoo (Finland) | ||
| Filed on Jun. 25, 2004, as Appl. No. 10/877,636. | ||
| Prior Publication US 2005/0286875 A1, Dec. 29, 2005 | ||
| Int. Cl. H02P 7/00 (2006.01) | ||
| U.S. Cl. 388—827 [388/825; 388/828; 451/6; 451/8; 451/41; 81/487] | 12 Claims |
| 1. A portable electric power tool with automatically adjusting operating speed, the tool comprising:
circuitry that evaluates the operating speed of the tool and that produces a speed related signal;
a microcontroller receiving the speed related signal and outputting a speed control signal;
a memory having a list of operating speeds stored therein, the microcontroller setting the initial nominal operating speed
for the tool from the list in the memory; and
circuitry to operate the tool initially at the initial nominal operating speed set by the microcontroller and that automatically
adjusts the operating speed of the tool based on the speed control signal output from said microcontroller.
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