Cleaning robot

• US 5,309,592 A
• Filed: 06/15/1993
• Issued: 05/10/1994
• Est. Priority Date: 06/23/1992
• Status: Expired due to Term

• Current Assignee: Xaraz Properties LLC (Intellectual Ventures LLC)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Hiratsuka, Kazuhiro
• Primary Examiner(s): ROBERTS JR, EDWARD
• Application Number:
  US08/076,754
• Time in Patent Office: 329 Days
• Field of Search: 15/49.1, 15/50.1, 15/98, 15/319, 15/339, 901/1, 51/177
• US Class Current: 15/49.1
• CPC Class Codes: A47L 11/4011 Regulation of the cleaning machine by electric means; Control systems and remote control systems therefor
• CPC Class Codes: A47L 11/4061 Steering means; Means for avoiding obstacles; Details related to the place where the driver is accommodated
• CPC Class Codes: A47L 2201/04 Automatic control of the travelling movement; Automatic obstacle detection
• CPC Class Codes: G05D 1/0227 using mechanical sensing means, e.g. for sensing treated area

Abstract

A cleaning robot having a robot body to be self-propelled on a floor along a side wall, and a cleaning mechanism mounted on the robot body comprises a steering device provided on the robot body for changing the direction of advance of the robot body, and a slide device mounted on the robot body and reciprocatingly movable toward and away from the side wall. A contact force sensor positionable in contact with the side wall is provided at an outer end of the slide device. Based on the detection signal of the sensor, the slide device is controlled so as to maintain the force of contact at a target value, and the steering device is controlled so that a component of the contact force in the direction of advance of the robot body becomes zero.

Claims

1. A cleaning robot having a robot body to be self-propelled on a floor along a side wall, and a cleaning mechanism mounted on the robot body, the cleaning robot being characterized in that the robot comprises:

a steering device provided on the robot body for changing the direction of advance of the robot body,

a slide device mounted on the robot body and reciprocatingly movable toward and away from the side wall,

a contact force sensor provided at an end of the slide device and positionable in contact with the side wall for detecting a force of contact exerted thereon by the side wall,

slide control means for controlling the slide device based on a detection signal from the contact force sensor so as to maintain the contact force at a target value or at a value within a target range, and

steering control means for controlling the steering device based on the detection signal from the contact force sensor so as that a component of the contact force in the direction of advance of the robot body becomes substantially zero.

2. A cleaning robot as defined in claim 1 wherein the cleaning mechanism is attached to the slide device and is movable toward and away from the side wall by the movement of the slide device.

3. A cleaning robot as defined in claim 1 wherein the contact force sensor has a structure for detecting force components in two directions symmetric with respect to the direction of slide of the slide device and each inclined at an angle of 45 degrees therewith, and the slide control means calculates the resultant force of the two components as the force of contact, the steering control means being operable to compare the two force components in magnitudes and change the direction of advance of the robot body toward a direction in which the two force components become equal to each other.

4. A cleaning robot as defined in claim 1 wherein the steering control means repeatedly alters the direction of advance with a specified period, and the slide control means varies the amount of slide of the slide device when there is a margin in the amount of slide within the specified period.