Robotic cart pulling vehicle
First Claim
Patent Images
1. A robotic cart pulling vehicle comprising:
- at least two axially collinear drive wheels;
a robot body mounted on said drive wheels;
a control system on the robot body utilizing, at least in part, a ded-reckoning navigational system;
a cart attaching mechanism on said robot body for coupling a cart to said robotic vehicle; and
a positioning error reducing system for reducing accumulated error in the ded-reckoning navigational system, said positioning error reducing system including at least a calibration system having at least one proximity sensor mounted on the robot body, said control system coupled to said at least one proximity sensor for adjusting a calculated robotic position, wherein the control system sets up virtual checkpoints along known fixed features of a predetermined length, takes a statistically significant number of proximity readings along an adjacent fixed feature, removes statistically anomalous readings and automatically adjusts the calculated robotic position based upon statistically significant readings.
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Abstract
A robotic cart pulling vehicle includes a positioning error reducing system for reducing accumulated error in the ded-reckoning navigational system. The positioning error reducing system including at least one of a low load transfer point of the cart attaching mechanism, a floor variation compliance structure whereby the drive wheels maintain a substantially even distribution of load over minor surface variations, a minimal wheel contact surface structure, a calibration structure using at least one proximity sensor mounted on the robot body, and a common electrical and mechanical connection between the cart and the robot vehicle formed by a cart attaching post.
99 Citations
19 Claims
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1. A robotic cart pulling vehicle comprising:
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at least two axially collinear drive wheels; a robot body mounted on said drive wheels; a control system on the robot body utilizing, at least in part, a ded-reckoning navigational system; a cart attaching mechanism on said robot body for coupling a cart to said robotic vehicle; and a positioning error reducing system for reducing accumulated error in the ded-reckoning navigational system, said positioning error reducing system including at least a calibration system having at least one proximity sensor mounted on the robot body, said control system coupled to said at least one proximity sensor for adjusting a calculated robotic position, wherein the control system sets up virtual checkpoints along known fixed features of a predetermined length, takes a statistically significant number of proximity readings along an adjacent fixed feature, removes statistically anomalous readings and automatically adjusts the calculated robotic position based upon statistically significant readings. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A robotic cart pulling vehicle comprising:
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at least two axially collinear drive wheels; a robot body mounted on said drive wheels; a control system on the robot body utilizing, at least in part, a ded-reckoning navigational system; a cart attaching mechanism on said robot body for coupling a cart to said robotic vehicle; and a positioning error reducing system for reducing accumulated error in the ded-reckoning navigational system, said positioning error reducing system including at least a minimal wheel contact surface structure, wherein each said drive wheel includes an annular contact surface formed as a coating over a solid, stiff core and includes at least one of (a) compression of the wheel in operation is less than 2% of the wheel radius of the wheel under no load, (b) the width of the annular contact surface is less than 1.5% of the length of the wheelbase, and (c) the width of the annular contact surface is on the order of 0.20″
. - View Dependent Claims (15, 16)
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17. A robotic cart pulling vehicle comprising:
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at least two axially collinear drive wheels; a robot body mounted on said drive wheels; a control system on the robot body utilizing, at least in part, a ded-reckoning navigational system; a cart attaching mechanism on said robot body for coupling a cart to said robotic vehicle; and a positioning error reducing system for reducing accumulated error in the ded-reckoning navigational system, said positioning error reducing system including at least a minimal wheel contact surface structure, wherein each said drive wheel includes an annular contact surface formed as a coating over a solid, stiff core and includes at least one of (a) compression of the wheel in operation is less than 1% of the wheel radius of the wheel under no load, and (b) the width of the annular contact surface is less than 1.0% of the length of the wheelbase. - View Dependent Claims (18)
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19. A robotic cart pulling vehicle comprising:
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at least two axially collinear drive wheels; a robot body mounted on said drive wheels; a control system on the robot body utilizing, at least in part, a ded-reckoning navigational system; a cart attaching mechanism on said robot body for coupling a cart to said robotic vehicle; and a positioning error reducing system for reducing accumulated error in the ded-reckoning navigational system, said positioning error reducing system including at least a floor variation compliance structure, wherein the cart attaching mechanism includes a cart attaching bore in the robot body and a cart attaching post within the cart attaching bore, wherein each said drive wheel is mounted to said robot body in a manner allowing vertical movement of said wheel relative to the cart attaching pole in the amount of at least three degrees measured from a center point between the collinear drive wheels along axles of the collinear drive wheels, whereby said collinear drive wheels maintain a substantially even distribution of load over minor surface variations.
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Specification