Lawn Sweeper Adjustable Brush Assembly Design
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Solution Overview
Problem
Existing lawn sweepers face issues with adjustable brush height mechanisms that alter the housing position relative to the ground, leading to inefficient debris collection and storage challenges, including larger debris escaping and increased storage space requirements.
Innovation Solution
A lawn sweeper design with an adjustable brush assembly that can change positions without moving the wheels, along with a foldable hopper assembly and tow bar, allowing for improved debris collection and compact storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the wheel assembly is adjusted to change brush position with respect to the ground, then the brush can be positioned at various heights for different terrain, but the housing position with respect to the ground also changes, which may be less than desirable
Solution Approach 1:
The invention divides the height adjustment function into two independent mechanisms: one for adjusting the brush assembly height relative to the housing, and another for adjusting the wheel assembly height relative to the housing. This segmentation allows the brush height to be adjusted without necessarily changing the housing position, as the wheel assembly can compensate for height differences.
Solution Approach 2:
The housing serves as an intermediary element between the wheel assembly and the brush assembly. By allowing independent adjustment of both the wheels and brush relative to the housing, the housing mediates the relationship between these components, enabling the brush to be positioned at various heights while maintaining consistent housing position with respect to the ground.
2Adaptability or versatility
If the housing is raised with respect to the ground to allow the brush to be further from the ground, then the brush can clear longer grass, but the distance between the bottom of the stop plate and the ground also increases, allowing larger debris to pass beneath
Solution Approach 1:
The invention separates the height adjustment of the brush assembly from the height adjustment of the stop plate by allowing independent adjustment of the wheel assembly. The stop plate is fixed to the housing, so when the wheels are adjusted to change brush height, the stop plate remains at a consistent position relative to the ground, preventing debris escape while still allowing brush height variation.
Solution Approach 2:
Instead of raising the housing to increase brush height (which raises the stop plate and allows debris escape), the invention inverts the approach by adjusting the wheel assembly height to achieve brush height adjustment while keeping the housing and stop plate position consistent with respect to the ground.
3Adaptability or versatility
If the housing height is changed to adjust brush position, then the brush can operate at different heights, but the tow bar height also changes, which may position the tow bar at an inadequate height for a given hitch
Solution Approach 1:
The invention divides the height adjustment functions into separate mechanisms: one for brush assembly height and another for wheel assembly height. The tow bar is fixed to the housing, so its height remains consistent when the brush height is adjusted through wheel assembly modification. This segmentation allows independent optimization of brush height for different terrain while maintaining consistent towing compatibility.
Solution Approach 2:
The housing acts as an intermediary that maintains consistent position with respect to the ground and tow bar height, while allowing the brush assembly height to be adjusted through wheel assembly modification. This mediation enables brush height adaptability without affecting towing compatibility.
4Adaptability or versatility
If an adjustable wheel assembly is used to change brush position, then the brush can be positioned for different terrain, but the weight is carried by the adjusting mechanism rather than directly by the wheels
Solution Approach 1:
The invention employs dynamic adjustment mechanisms that allow the wheel assembly and brush assembly to be positioned at various heights while maintaining structural simplicity. The adjusting mechanisms are designed to be integrated with the wheel assembly itself, allowing weight to be carried by the wheels rather than by separate adjusting mechanisms, while still providing the necessary adaptability for different terrain conditions.
Data Source
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AI summary
The present disclosure relates to a lawn sweeper (100) designed to collect debris, such as grass clippings and leaves, from a surface such as a lawn, and more particularly to a lawn sweeper (100) with an adjustable brush assembly (118) and characteristics associated with improved storage of such a device. A user may adjust the brush assembly (118) with respect to the housing (106) without needing to move the wheels (114). The hopper assembly (104) may include a panel (606) movable to be placed in at least two orientations, thereby allowing a user to change the volume within which the hopper assembly (104) may collect debris. Methods are also disclosed for adjusting the brush assembly (118) and for storing a lawn sweeper unit (102).