| 摘要 |
An upright vacuum cleaner comprises a base assembly pivotally connected to an upright assembly. The base assembly comprises housing, a support, and ratchet-operated nozzle height adjustment mechanism for raising or lowering a suction nozzle on the base assembly relative to a surface to be cleaned. The ratchet-operated nozzle height adjustment mechanism includes a ratchet mechanism for raising and lowering the housing relative to the support |
