| 摘要 |
<p>PURPOSE:To prevent an accidental dropping of an air filter during operation by a method wherein an air filter receptacle member is arranged at a lower part below a suction port and a resilient member for pushing the lower part against a casing is arranged at the lower part of a filter guiding member. CONSTITUTION:A hand is placed at a central part 40 of a lower side 29 of an air filter 21 to pull it toward an operator. The lower side 29 may abut against a front piece 34 of a filter guiding member 30. After this operation, as the lower side 29 is further pulled forwardly, a spring 36 is compressed and the lower side 33 of the filter guiding member 30 is moved forwardly, resulting in that a clearance A between the front piece 34 and a mounting piece 27 is increased and the air filter 21 is pulled down from the clearance A. In this way, a resilient force of the spring 36 may act through an operation of the lower side 29 of the air filter 21 to cause the lower part 33 of the filter guiding member 30 to be moved forwardly. Thus, the clearance A between the front piece 34 and the mounting piece 27 is increased and the air filter 21 may easily be removed. Then, the air filter 21 keeps its held state with the front piece 34 and the mounting piece 27 during its pulling-out operation and then its accidental dropping during taking-out operation is prevented.</p> |
