| 摘要 |
<p>PURPOSE: To treat cooling wind diffused into a blade chamber without influence to the dust collecting function of the blade. CONSTITUTION: A plurality of slits 27 are formed on the circumference of the conical oblique part 4a formed at the upper part of a pedestal 4 with an output shaft as a center by radial ribs 26 to communicate the front with the bear of the pedestal 4, and a cover plate 28 is provided perpendicularly to the shaft at the forward position of the part 4a. The plate 28 is brought into close contact with the frame 3a of the front surface of a blade case 3, engaged with screw- clamped parts 29, 30 to block the front of the part 4a to form a partition chamber 31, while the opening 32 is provided by opening the opposite side of the cutting direction to communicate the chamber 31 with a blade chamber 16. Further, a blade case cover 5 is formed at the front position of the opening 32 with an external exhaust port 33.</p> |
