Integrated Grass Trimmer Housing Design for Heat Dissipation
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Solution Overview
Problem
Current grass trimmers have a separate construction of the operating handle and power portion, leading to material waste and exposed wires, which is inefficient and poses safety hazards.
Innovation Solution
A unified design for the gardening tool with a rear housing that accommodates the battery pack, motor, and circuit board, featuring a detachable connection for the battery pack, air inlets for cooling, and a handle portion that supports the user's arm, along with a connecting means for airflow between the front and rear housings, and a clip structure for the connecting wire, enhancing ergonomics and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the operating handle and power portion are constructed as two separate parts, then the structure is simpler and easier to manufacture, but material is wasted and wires are undesirably exposed
Solution Approach 1:
The patent merges the operating handle and power portion into a single integrated housing structure. The handle portion and power portion are formed as one piece, eliminating the need for separate components and their connecting wires. This integration reduces material waste from multiple parts and connections while maintaining ease of manufacture through molded construction.
2Ease of manufacture
If the operating handle and power portion are constructed as two separate parts, then the structure is simpler and easier to manufacture, but wires are undesirably exposed creating safety hazards
Solution Approach 1:
By integrating the handle and power portions into a single housing, the patent eliminates exposed connecting wires entirely. The internal components are enclosed within the unified housing structure, removing the safety hazard of exposed wires while maintaining manufacturing simplicity through molded construction.
3Shape
If the battery pack is completely enclosed in the rear housing, then the design is more compact and aesthetically pleasing, but heat dissipation becomes insufficient
Solution Approach 1:
The patent applies local quality by creating specific heat dissipation features at critical locations. The battery pack housing includes protruding portions and air inlet/outlet openings at strategic positions to enable heat dissipation, while the overall design remains compact. This localized approach to thermal management allows the battery to be partially exposed or ventilated without compromising the compact form factor.
4Device complexity
If the handle portion is positioned without considering arm support, then the structure is simpler, but ergonomics are poor causing user fatigue
Solution Approach 1:
The patent enhances ergonomics by adding a support surface at the specific location where the user's arm rests. This localized feature provides comfort and reduces fatigue without requiring major structural changes to the overall handle design. The support surface is integrated into the handle portion at the appropriate position to match natural arm placement during operation.
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 solution reduces material waste, improves ergonomics by supporting the user's arm, and ensures better heat dissipation and safety through exposed battery pack parts and airflow, while maintaining a compact design.
Implementation Method 1
a fan for generating an airflow from the inside of the rear housing to the inside the front housing
Implementation Method 2
the rear housing preferably forms an air inlet at the connecting portion
Data Source
AI summary
A gardening tool such as a grass trimmer is provided with a tool head, a motor for driving the tool head, a front housing for accommodating the motor, a trigger switch for activating the motor, a trigger operable to control the trigger switch, a battery pack for providing electric energy to the motor, a circuit board for electrically connecting the motor to the battery pack, and a rear housing for accommodating the circuit board. The rear housing forms a housing chamber for accommodating the trigger switch, the circuit board, and wires between the circuit board and the trigger switch.