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US 5,940,927 AGranted
Autonomous surface cleaning apparatus
AssigneeAktiebolaget Electrolux
InventorsAnders Haegermarck, Bjorn Riise, Jarl Hulden
Life of this patent
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AssigneeAktiebolaget Electrolux
InventorsAnders Haegermarck, Bjorn Riise, Jarl Hulden
Estimating the term…
An autonomous device is adapted to automatically move on a work surface removing dirt, such as gravel, sand, dust particles and the like, from said work surface. The device comprises a chassis provided with wheels and with a brush roller rotated by a drive motor during said movement for the purpose of brushing up the dirt towards a suction duct wherefrom, by means of a suction air stream, the dirt is conveyed to a dust container. An electronic control device is provided for the control of the drive motor of the brush roller. If the movement of the brush roller is blocked or obstructed to a predetermined extent the control device is arranged to stop the brush roller motor and then transitorily activate the motor in the opposite direction and, finally, after another stop, to reconnect the brush roller motor to operate in the original direction of rotation.
An autonomous device (10) adapted to automatically move on a work surface (11) removing dirt, such as gravel, sand, dust particles and the like, from said work surface, said device (10) comprising a chassis (12) provided with wheels and with a brush roller (20) rotated by a brush roller motor (22) during said movement for the purpose of brushing up the dirt towards a suction duct (23) wherefrom, by means of a suction air stream, the dirt is conveyed to a dust container (24), an electronic control device (25) being provided for the control of the drive motor (22) of the brush roller, characterized in that if the movement of the brush roller (20) is blocked or obstructed to a predetermined extent the control device (25) is arranged to stop the brush roller motor (22) and then transitorily activate the brush roller motor (22) in the opposite direction and, finally, to reconnect the brush roller motor (22) to operate in the original direction of rotation.
An autonomous device according to any of the preceding claims, characterized in that the normal direction of rotation of the brush roller (20) is opposite to that of the drive wheels (14, 15) of the device when the device (10) is moving on the work surface (11) and cleaning takes place.
Dependencies are inferred from the claim text.