| 摘要 |
A brush roller accessory for a vacuum cleaner includes a main support roller 2 and a power-driven brush roller 3 rotatably arranged in a housing (1, Fig 1), and a spring-biased adjusting roller 4 that adjustably protrudes from the housing to bear some of the total contact force of the accessory against a floor F, to reduce or relieve the contact force exerted by the brush roller against the floor. The adjusting roller is rotatably mounted on a pivot lever 5, having a first end pivotally connected to the housing and a second end connected to a spring 6 that biases the lever to pivot the adjusting roller outwardly from the housing. A rotary knob 12 with several stop surfaces (9A-D, Fig 2A) may select an upper limit on the pivot range of the lever and the adjustment height of the adjusting roller. A coupling link 10 may pivot the adjusting roller to a maximally protruding position to lift the brush roller into a parking position. |
