Patent ID: 7256520
Filing Date: 2007-08-14
Classification: B24B,B25F,H02K

Abstract:
1. A power tool comprising: an electric motor for driving a tool, said electric motor comprising: first and second supporting parts, each of said first and second supporting parts having first and second longitudinal ends; a tool head attached to the first longitudinal end of said first supporting part; a self-supporting stator having a first longitudinal end facing said tool head and a second longitudinal end opposite to the first longitudinal end, the first longitudinal end of said stator being attached to the second longitudinal end of said first supporting part and the second longitudinal end of said stator being attached to the first longitudinal end of said second supporting part a motor shaft carrying an armature having a winding core; a commutator; brushes cooperating with said commutator; a fan driven by said motor shaft; and a housing which externally surrounds said stator and said first and second supporting parts, said housing being connected to at least one of said first and second supporting parts; wherein said commutator is arranged between said fan and said winding core of said armature; wherein said motor shaft is supported rotatably on said first supporting part, said second supporting part, and said tool head; wherein said first supporting part is arranged for routing air between said fan and an opposite end of said electric motor along said armature and said brushes; said power tool further comprising at least one switch engaging an activation surface made of an elastic material cooperating with a control element for activating said switch, said switch being supported on at least one of said first and second supporting parts; wherein said first supporting part comprises at least one holding surface for holding said at least one switch; and wherein said first supporting part is configured as an air guide ring forming an air flow channel extending around said commutator between said fan and said stator.