| 摘要 |
A window scraper and method are provided wherein a scraping brush has filaments and wherein the tips of the filaments are moved linearly across the work surface as the brush rotates. Preferably, the brush has brass filaments trimmed to a point, and the brush drive mechanism moves the brush in an oscillating arcuate path while cams and cam surfaces simultaneously cause the brush to move toward and away from the work surface to maintain the tip of the filaments in substantially the same plane at a constant distance and pressure relative to the work surface. A novel brush has filaments trimmed to a point, an axle of rotation and cams to engage cam surfaces. The device includes an oscillating drive mechanism, a slot to rotatably and slidingly receive the brush axle, and cam surfaces to engage the brush cams and cause the brush axle to slide in the slot, causing the brush to move toward and away from the work surface during portions of the rotating brush sweep.
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