| 摘要 |
<p>FLOOR SWEEPER WITH IMPROVED DRIVE WHEEL CONSTRUCTION A floor sweeper includes a housing sub-frame having a pair of end partitions which mount a brush for sweeping debris from the floor and drive wheels for supporting the sweeper and rotating the brush. The drive wheels are mounted on either side of the brush for free movement between loaded and unloaded positions against a pair of coupling wheels disposed at opposite ends of the brush axle in response to fore and aft translation of the sweeper over the floor. Each drive wheel mounting includes a curved wire spring having a pair of bent legs at opposite ends thereof. One leg is pivotally mounted to the end partition and the other leg rotatably mounts the drive wheel with its free end riding along an inclined ramp formed in the end partition. When the sweeper is moved in one direction the spring is compressed to urge the drive wheel into driving engagement with a coupling wheel to rotate the brush. When moved in the opposite direction, the drive wheel pivots on the one leg of its wire spring away from the coupling wheel to its unloaded position while at the same time the free end of the other leg of the wire spring rides up the ramp to compress the spring and thereby preload or urge the drive wheel back toward the coupling wheel.</p> |
