Lawn Sweeper Brush Drive and Height Adjustment
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Solution Overview
Problem
Existing lawn sweepers face issues with inconsistent brush rotational speed, clogging, uneven material loading, and height adjustments due to wheel-driven mechanisms, which affect efficiency and precision in sweeping, especially on uneven terrain.
Innovation Solution
A lawn sweeper with a motor that rotates the brush independently of the wheel, allowing for controlled brush speed and height adjustment, along with a durable transmission system and a height adjustment mechanism that maintains the brush axis vertically aligned with the wheel axis, ensuring consistent sweeping performance and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the lawn sweeper uses a wheel-driven mechanism to rotate the brush, then the structure is simple, but the brush rotational speed is inconsistent and depends on ground speed
Solution Approach 1:
The patent replaces the wheel-driven mechanical system with an electric motor-driven system. The motor independently controls brush rotational speed without being coupled to wheel rotation, eliminating the direct dependence of brush speed on ground speed and enabling consistent rotational speed regardless of terrain variations.
2Ease of operation
If the ground speed of the lawn sweeper is slowed down to sweep thick grass or leaves, then precision and safety improve, but the brush slows down and may become clogged
Solution Approach 1:
The patent implements dynamic control of brush speed through an electric motor that can independently adjust rotational speed. This allows the brush to maintain optimal sweeping speed for thick grass or leaves even when the sweeper moves slowly, preventing clogging while preserving operational precision and safety.
3Speed
If a gear-up ratio is used to rotate the brush at higher speed, then brush rotational speed increases, but torque to the brush decreases when moving slowly
Solution Approach 1:
The patent replaces the gear-up ratio mechanical transmission with an electric motor directly coupled to the brush. The motor provides both high rotational speed and sufficient torque simultaneously, eliminating the trade-off inherent in mechanical gear systems where speed increase comes at the cost of reduced torque.
4Adaptability or versatility
If the brush height is adjusted for different trailer hitch heights, then adaptability improves, but the brush may become too high or too close to the lawn on uneven terrain
Solution Approach 1:
The patent implements a dynamic height adjustment mechanism that allows the brush assembly to move vertically relative to the frame. This dynamic adjustment compensates for terrain variations and hitch height differences, maintaining optimal brush-to-lawn clearance and preventing the brush from being too high or digging into the lawn.
Data Source
AI summary
In accordance with one aspect, a lawn sweeper for being towed by a lawn tractor including a body, a rotatable brush mounted to the body, and a motor for rotating the brush independently of the rotation of at least one wheel of the lawn sweeper. The lawn sweeper further includes a remote control for being operated by a user of the lawn tractor to control the motor. In another aspect, a lawn sweeper having a pair of wheels rotatable about a wheel axis, a body shiftable between raised and lowered positions relative to the wheels, and brush mounted to the body and rotatable about a brush axis. The brush axis is substantially vertically aligned with the wheel axis when the body is in the raised position and the lowered position.