Electricity: motive power systems – Positional servo systems
Reexamination Certificate
2006-05-02
2006-05-02
Martin, David (Department: 2837)
Electricity: motive power systems
Positional servo systems
C318S135000, C318S430000, C318S805000, C015S049100, C015S098000
Reexamination Certificate
active
07038416
ABSTRACT:
A control system for controlling the work output delivered to a floor surface by a work tool associated with a floor maintenance machine, such as a burnisher, is provided. In one embodiment, a voltage regulator regulates the voltage provided to the motor assembly that drives the work tool. A current sensor monitors the motor current drawn by the motor assembly and provides a signal representative thereof to a controller. The controller also receives as an input a work selector signal representative of a desired level of work output. Based on the work selector signal and the sensed motor current, the controller provides a control signal to an actuator. In response to the control signal, the actuator raises or lowers the work tool relative to the floor as need to control the work output delivered to the floor. In another embodiment, the voltage regulator is omitted, and the controller is configured to generate the control signal based on the product of the motor current and the voltage provided to the motor assembly.
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PCT International Search Report, PCT/US02/16248, Oct. 7, 2002; 4 pages.
Erko Robert J.
Haeg John Peter
Fulbright & Jaworski LLP
Martin David
McCloud Renata
Tennant Company
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