| 摘要 |
PROBLEM TO BE SOLVED: To surely and easily clean all of the dust in a rail groove together with one or two reciprocating operation. SOLUTION: This brush for cleaning a plurality of rail grooves 2 arranged in parallel with each other with a stage difference in a sash frame 1 provided in an opening part of a building is formed by cutting to align the length of hair of the brush hair with a stage difference from a tip to a base end of a base plate 7 in response to stage differences along the cross direction of a plurality of rail grooves 2 for trimming, and planting the brush hair 8 to be obliquely projected toward a tip. COPYRIGHT: (C)2004,JPO
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