| 摘要 |
<p>To avoid penetration of water spray (e.g. from cooling water being sprayed at a location being worked or when working in the rain) into motor compartment 14 of an electric drill, a labyrinthine guide 5 is supplied by a cooling air suction inlet 7 which has a shield 12 in front of its entry and is fitted with at least one filter 8, whilst an outlet 16 is formed to deflect outgoing air and is provided with a closure in the form of a filter 17 or a flap valve 23, Fig. 1a. Both the inlet and the outlet provide 180 DEG deflection of the air current impelled by fan 13. The inlet 7 may be adjustable in direction and can be demountable from housing 1 in a manner which breaks the current to the motor 3. The inlet 7 also incorporates a fine filter 11. <IMAGE></p> |
