Brush-type cleaning system
Patent 4951347 Issued on August 28, 1990. Estimated Expiration Date: 
January 23, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 23, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3007191 3886623 Sweeper hood with transverse air duct and broom compartments High speed pick-up head Patent #: 4773121 InventorsAssigneeApplicationNo. 471662 filed on 01/23/1990US Classes:15/340.3, Including brush15/346, Closed circuit systems, i.e., air recirculating15/368Adjustable with respect to nozzleExaminersPrimary: Moore, Chris K.Attorney, Agent or FirmForeign Patent References
International ClassE01H 001/08AbstractApparatus for cleaning surfaces includes a cleaning head defining an open-faced chamber for facing the surface to be cleaned and means for blowing air into the chamber. A rotary brush is positioned in the chamber for engaging and brushing the surface to be cleaned, and, preferably, the flowing air is directed in a stream that directly impinges the surface to be cleaned adjacent the brush. It is also preferred for the brush to be carried on an arm movable between a first position for engaging the surface to be cleaned and a second position where the brush is spaced from the surface to be cleaned. A control system is provided for power means for moving the brush and arm between the first and second positions, to cause the brush and arm to assume the first position when the motor is on to operate the brush, and to cause the brush and arm to assume the second position when the motor is off.Other References
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