Vacuum cleaner control
Patent 4357729 Issued on November 9, 1982. Estimated Expiration Date: 
January 26, 2001. 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 26, 2001. 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 3205420 3551775 3579706 3588943 Constant performance vacuum cleaner Patent #: 4021879 InventorsApplicationNo. 06/228279 filed on 01/26/1981US Classes:15/319, With automatic control15/377, Auxiliary or separate, i.e., non-fan, driving motor318/434, LIMITATION OF MOTOR LOAD, CURRENT, TORQUE OR FORCE (E.G., PREVENTING OVERLOAD)318/99, Fixed ratio of load or current division902/2Protects transmitted data (e.g., encryption or decryption)ExaminersPrimary: Moore, Chris K.Attorney, Agent or FirmInternational ClassA47L 9/28 (20060101)AbstractA vacuum cleaner structure having a control for reducing the total current delivery to the vacuum cleaner as when both a suction motor thereof and a brush motor thereof are being operated concurrently. The control includes an "On-Off" switch mounted on a portion of the suction hose for the vacuum cleaner. The invention comprehends the provision of such a current-reducing control where the full load currents of the suction and brush motors cumulatively total an amount greater than a preselected safe current deliverable to the vacuum cleaner. The control is arranged to be used with a vacuum cleaner having a suction hose connected between a suction unit and a cleaning unit thereof, such as a floor cleaning unit. In one form, the control utilizes a two-conductor wire suction hose, and in another form, the control utilizes a three-conductor wire suction hose. The "On-Off" switch is mounted on the handle on the end of the suction hose which may be attached to a cleaning unit and circuitry is provided in a control portion carried by the suction unit responsive to the disposition of the "On-Off" switch to effect the desired current and speed control of the system. The handle-mounted "On-Off" switch also controls the suction unit during cleaning operations which do not employ a floor cleaning unit including a motor-driven brush.Field of SearchAuxiliary or separate, i.e., non-fan, driving motor | |
