| 摘要 |
The device for collecting the chalk powder from the chalk inserting section connected with the hose end of the suction device, prevents the air pollution in classroom. The device comprises the chalk inserting section(B), suction chambers(21, 33) of the blackboard eraser(C), suction hose(D) and suction device(A). The chalk inserting section(B) for fixing the chalk(25), has a suction chamber(21) formed by the pushing rod(20) for making clearance between the inner/outer tube bodies(14)(15) and the pushing rod(16) contacting with the stationary guide plate(17); stationary projection(13) engaged with the groove(12') of the suction hose(D). The chalk powder is collected to the collecting filter net(1) via the hose(D) by sucking the air from the suction chamber(21) driven by the impeller(5).
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