| 摘要 |
PROBLEM TO BE SOLVED: To reduce a device in size while maintaining a conventional preferable function such as a dust-prevention. SOLUTION: A hand power tool 10 includes a casing 12 for accommodating a motor 31 therein and a rotating tool 21 rotated and driven by receiving a rotating and driving force from the motor 31. The casing 12 includes a bearing support 61 provided with a bearing 18 for supporting the motor shaft 32 of the motor 31. The bearing support 61 has a small through-hole 61a having a smaller diameter than an outside diameter of the bearing inside the bearing support into which the motor shaft 32 is inserted and a large through-hole 61b formed and opened outside the casing 12 from the small through-hole 61a with a diameter larger than the outside diameter of the bearing. Thus, the bearing 18 is inserted from outside the casing 12. A dust-proof labyrinth 71 is formed inside the bearing support 61. COPYRIGHT: (C)2011,JPO&INPIT
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