Autonomous Clay Court Sweeper With Obstacle Sensing

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Solution Overview

Problem

Existing clay tennis court sweepers require manual effort and pushing, posing a risk of injury and inefficiency.

Innovation Solution

A rechargeable battery-powered sweeper with motorized wheels and rollers, equipped with sensors and safety features, operates autonomously to even out the clay surface without human intervention.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If manual sweepers are used, then the device complexity is low, but the ease of operation deteriorates due to required manual effort and pushing

Engineering Contradiction:
Improveease of operationVSAvoiddevice complexity
Core Design Contradiction:
Ease of operationVSDevice complexity

Solution Approach 1:

The sweeper is equipped with autonomous navigation capabilities, including sensors for obstacle detection and avoidance, and automatic return-to-charging functionality. The system self-manages its operation without requiring continuous human intervention, resolving the contradiction by making the device service itself while accepting increased complexity through integrated control systems and sensors.

Inventive Principle:
Principle #25Self-service

Solution Approach 2:

The patent replaces manual mechanical pushing with an electric motor-driven system. The motorized roller and drive mechanism substitute for human physical effort, transforming the operation from manual mechanical work to an automated electromechanical system, thereby improving ease of operation despite increased device complexity.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

2Productivity

If motorised sweepers are used, then the productivity is improved, but the ease of operation deteriorates as they still require pushing and driving by the user

Engineering Contradiction:
ImproveproductivityVSAvoidease of operation
Core Design Contradiction:
ProductivityVSEase of operation

Solution Approach 1:

The autonomous navigation system with obstacle detection sensors and automatic path planning enables the sweeper to operate independently without user guidance. The system self-manages its movement across the court, maintaining high productivity while eliminating the need for user pushing or driving operations.

Inventive Principle:
Principle #25Self-service

Solution Approach 2:

The patent implements variable speed control with multiple sweep types that can be manually selected, allowing the system to adapt its operating parameters to different court conditions and requirements. This flexibility maintains productivity while reducing operational complexity through automated parameter management.

Inventive Principle:
Principle #35Parameter changes

3Ease of operation

If autonomous operation is implemented, then the ease of operation is improved, but the device complexity increases due to battery and charging station requirements

Engineering Contradiction:
Improveease of operationVSAvoiddevice complexity
Core Design Contradiction:
Ease of operationVSDevice complexity

Solution Approach 1:

The sweeper automatically returns to its charging station when the battery level is low or after completing a sweeping cycle. This self-charging capability eliminates the need for manual battery replacement or charging operations, improving ease of use while managing complexity through automated battery management systems.

Inventive Principle:
Principle #25Self-service

Solution Approach 2:

The charging station acts as an intermediary between the power source and the mobile sweeper unit. It provides automated battery recharging and potentially battery swapping functionality, enabling autonomous operation without requiring complex onboard power management in the sweeper itself.

Inventive Principle:
Principle #24Intermediary (Mediator)

4Productivity

If the sweeper operates at high speed, then the productivity is improved, but the safety deteriorates due to collision risks

Engineering Contradiction:
ImproveproductivityVSAvoidsafety
Core Design Contradiction:
ProductivityVSReliability

Solution Approach 1:

The sweeper is equipped with sensors that continuously monitor the environment for obstacles and detect court line markings. This feedback system enables real-time obstacle detection and automatic speed adjustment, allowing high-speed operation during clear conditions while automatically reducing speed when obstacles are detected, thus maintaining both productivity and safety.

Inventive Principle:
Principle #23Feedback

Solution Approach 2:

The patent implements variable speed control with different sweep types that can be selected based on conditions. The system dynamically adjusts its operating speed and pattern, enabling high-speed sweeping when safe and slower, more careful operation when obstacles or court features require attention, balancing productivity and safety through adaptive control.

Inventive Principle:
Principle #15Dynamics

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The sweeper efficiently and safely levels the clay court surface in a short time, ensuring a uniform bounce for tennis balls, reducing effort and risk of injury.

Implementation Method 1

a rechargeable battery housed under the casing

Methodology Applied
Scientific EffectBattery (electricity): Battery (electricity)

Implementation Method 2

a motorised roller driven by means of a motor

Methodology Applied
Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 3

provided with rolling means, preferably by means of two pairs of wheels

Methodology Applied
Scientific EffectFriction: Friction

Implementation Method 4

a fixed brush is attached to the rear portion of the machine, the function of which is to shape the final straightening

Methodology Applied
Scientific EffectFriction: Friction

Data Source

PatentEP4706792A1Clay tennis court sweeper
Publication Date: 2026.03.11 MONTES MONTESINOS RAFAEL
  • EP4706792A1 patent drawingFigure 1
  • EP4706792A1 patent drawingFigure 2
  • EP4706792A1 patent drawingFigure 3

AI summary

The invention relates to a tennis court sweeper that has a casing (1) with a generally rectangular prism-like shape, the front portion of which has a curved profile, and having two pairs of wheels (2) on its sides. It also has sweeping means and safety means, and it is driven by a motor (7) powered by a rechargeable battery (6) via a charging station, wherein the sweeping means comprise a stationary brush (3) attached to the rear portion of the machine and a rotary roller (10) driven by the motor (7). This motor is located in the inner space defined under the casing (1) and the safety means of the sweeper are, on one side, an obstacle sensor (5) and a light signal (4) that is activated when it moves along the court.