Shutoff control methods for surface treating machines

Details Shutoff control methods for surface treating machines Shutoff control methods for surface treating machines

1997-10-17

2000-03-28

Till, Terrence R.

Cleaning and liquid contact with solids

Processes

Including use of vacuum, suction, or inert atmosphere

134 6, 15319, 15 501, 15320, A47L 500

Patent

active

06042656&

ABSTRACT:
An apparatus (200) is provided in a floor scrubber (10) for automatically shutting off the motor (60) which rotates an agitator (64) and the motor (96) of a vacuum assembly under various operating conditions of the floor scrubber (10). The current to the motors (60, 96) is detected by devices (204, 206) and monitored by a control circuit (202) controlling devices (208, 210 which interrupt operation of the motors (60, 96). In the preferred form, operation of the agitator (64) is interrupted when the current to the brush motor (60) is less than or equal to a threshold level indicating that the agitator (64) has been raised from the floor surface as the current to the brush motor (60) would be above the threshold level when the agitator (64) engages the floor surface. Operation of the vacuum assembly is interrupted when the current to the vacuum motor (96) drops to a fixed percentage over a period of time from normal operating levels indicating the path of the air in the vacuum assembly has been blocked.

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