| 摘要 |
A height adjustment mechanism for a vacuum cleaner includes a wheel carriage pivotally mounted to a foot of the vacuum cleaner, a height adjustment cam which engages the wheel carriage, and a cam actuator which attaches to the height adjustment cam for camming the height adjustment cam against the wheel carriage. The height adjustment cam is formed with a stepped bottom camming surface. The camming surface is formed with a plurality of spaced parallel ribs having a rounded outer surface which minimizes the surface-to-surface contact between the height adjustment cam and the wheel carriage. This reduced surface-to-surface contact reduces the frictional resistance between the height adjustment cam and the wheel carriage allowing the cam actuator to be easily slid for height adjustment of the vacuum cleaner foot.
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