Walk-Behind Power Tool Handle Adjustment System
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Solution Overview
Problem
Walk-behind power tools, such as lawnmowers, have a larger footprint due to elongated handles, making storage difficult and requiring increased energy expenditure for operation, with narrower cutting paths compared to riding mowers.
Innovation Solution
A handle adjustment system with a handle adjustment grip, cable, and locking wedge, along with a spring, allows the handle to pivot or fold, reducing the tool's footprint and enabling a wider cutting path through dual motors and blade assemblies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an elongated handle is used for walk behind power tools, then the user can grip and operate the tool, but the footprint of the tool increases making storage more difficult
Solution Approach 1:
The handle is designed to be adjustable and movable between different positions relative to the housing. The handle adjustment system includes a cable, locking wedge, and spring mechanism that enables the handle to move between an extended operating position and a retracted storage position, making the tool adaptable to both operational and storage needs
Solution Approach 2:
The handle adjustment system is divided into separate functional components: a handle adjustment grip, a cable, a locking wedge, and a spring. This segmentation allows each component to perform its specific function independently while working together to achieve the overall goal of handle position adjustment
2Ease of operation
If an elongated handle is used for walk behind power tools, then the user can operate the tool, but the energy expenditure of the user increases
Solution Approach 1:
The adjustable handle allows the user to optimize the handle position for comfortable operation, reducing unnecessary energy expenditure. The spring-loaded mechanism also provides assistance in moving the handle, reducing the effort required compared to a fixed rigid handle
3Adaptability or versatility
If a narrow cutting path is used in walk behind lawnmowers, then the tool can be maneuvered, but the productivity decreases
Solution Approach 1:
The adjustable handle system allows the user to optimize the cutting path width by adjusting the handle position, enabling wider cutting paths when productivity is prioritized while maintaining maneuverability when needed
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 handle adjustment system improves ease of use and storage by reducing the tool's footprint and increasing the cutting path width, while maintaining structural rigidity and efficient operation.
Implementation Method 1
The handle adjustment system includes a spring that works in conjunction with the cable and locking wedge to enable handle position changes
Implementation Method 2
at least one cable coupled to the handle adjustment grip at a first end and coupled to a locking wedge at a second end
Implementation Method 3
a locking wedge that can engage with a slot in the housing to secure the handle in a fixed position
Data Source
AI summary
Walk behind power tools are provided. A walk behind power tool includes a housing; a power source; a motor selectively powered by the power source; a drive shaft; a handle; and a handle adjustment system. The handle adjustment system can be configured to move between different positions relative to the housing. The system can include a handle adjustment grip; at least one cable coupled to the handle adjustment grip at a first end and coupled to a locking wedge at a second end; and a spring. Engagement of the handle adjustment grip in a first direction enables the handle position to be moved relative to the housing. The power tool may have a plurality of cutting assemblies each powered by a respective motor. The power tool may be self-propelled and include a speed control assembly.