Power Tool Electrical Module Terminal Positioning
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Solution Overview
Problem
Existing power tools, such as lawn mowers and weeders, face issues with water and foreign matter entering the battery chamber, leading to oxidation and rusting of electrical connection terminals, which can cause short circuits, and existing waterproof solutions complicate assembly and lose effectiveness over time.
Innovation Solution
The electrical connection terminal is positioned at the top portion of the housing, allowing water and foreign matter to adhere to the bottom of the battery chamber, preventing contact with the terminal, and eliminating the need for additional waterproof units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a waterproof enclosed unit is added to prevent water and foreign matters from entering the battery chamber, then the protection of the electrical connection terminal is improved, but the assembly and disassembly convenience deteriorates and the waterproof ability is lost due to damages
Solution Approach 1:
The patent extracts the electrical connection terminal from the vulnerable battery chamber interior and positions it at the top portion of the housing, outside the main battery chamber space. This extraction eliminates the need for a waterproof enclosed unit while still protecting the terminal from water and foreign matters that enter through the battery chamber opening.
Solution Approach 2:
The patent changes the spatial dimension of the electrical connection terminal by moving it from the horizontal plane inside the battery chamber to the vertical top portion of the housing. This dimensional change allows water and foreign matters to settle at the bottom while keeping the terminal elevated and exposed to air, achieving protection without additional waterproof components.
2Reliability
If a waterproof enclosed unit is added to prevent water and foreign matters from entering the battery chamber, then the protection of the electrical connection terminal is improved, but the device complexity increases
Solution Approach 1:
The patent removes the need for a waterproof enclosed unit by extracting the electrical connection terminal from the battery chamber interior and positioning it at the top portion of the housing. This simplifies the overall device structure while maintaining protection against water and foreign matters.
Solution Approach 2:
The patent merges the protection function into the existing housing structure by positioning the electrical connection terminal at the top portion, utilizing the natural gravity-driven separation of water and air spaces. This eliminates the need for separate waterproof components and integrates protection into the basic housing design.
3Reliability
If the battery chamber opening is sealed to prevent water entry, then the protection of the electrical connection terminal is improved, but the ease of battery assembly and disassembly deteriorates
Solution Approach 1:
The patent extracts the electrical connection terminal from the battery chamber interior and positions it at the top portion of the housing, allowing the battery chamber opening to remain open for easy battery access while still protecting the terminal from water and foreign matters through gravitational separation.
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
This design effectively prevents water and foreign matter from contacting the electrical connection terminal while maintaining simplicity and reducing production costs by avoiding additional waterproof components.
Implementation Method 1
the electrical connection terminal is disposed at the top portion within the housing... water and/or foreign matters entering the battery chamber through the battery chamber opening will be adhered to the bottom of the battery chamber due to gravity
Data Source
Figure 1
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AI summary
The invention is related to an electric module for use in a power tool comprising a housing and an electrical connection terminal. The housing defines a battery chamber which at least partly accommodates a battery assembly. The electrical connection terminal is disposed at the top portion within the housing. The electrical connection terminal is arranged to electrically connect with the battery assembly accommodated in the battery chamber. The housing prevents water and/or foreign matters in the battery chamber from contacting with the electrical connection terminal disposed at the top portion inside the housing. The invention allows the battery chamber exposing to the external through the opening without the necessity of including additional waterproof/enclosed units in the electric module for preventing water and/or foreign matters entering the battery chamber and contacting with the electrical connection terminal disposed at the top portion within the housing. The structure is simple, the production cost is low, and unnecessary units are reduced.