| 摘要 |
<p>PROBLEM TO BE SOLVED: To enable a cleaning operation to be easily and positively performed by setting a pitch of it to be higher than a height of wave head so as to cause a finger to enter between the waves. SOLUTION: At a suction grill 2, slits 3 are formed between wave heads 4 of a panel having a substantially U-shaped section of a wave shape projected downwardly at a wave head 5 in a predetermined pitch P, sucked air is passed through the slits 3. Each of the slits 3 is formed by recessing one part near one wave 4 with a wave head 5 being interfaced. The pitch P is set to more than twice the height T of the wave head 5, preferably set to about three times in such a way that a finger F may enter the wave 4. In this case, the height T of the wave head 5 is meant by a distance ranging from an outer surface of a wave bottom part 6 to the upper-most projecting point of the wave head 5. At this suction grill, when the pitch P is large and a finger F is abutted against waste mop or the like and inserted into the wave 4, the finger enters down to a wave bottom part 6, one wiping with this member enables stains at the wave 4 to be removed.</p> |
