Trigger Switch Covering Member Inspection Design
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Solution Overview
Problem
Existing trigger switches for electric tools face challenges in inspecting the engaged state of external packing, which hinders the verification of dustproof and waterproof properties, leading to potential failures due to foreign matter ingress.
Innovation Solution
A trigger switch design that includes a covering member attached to both the shaft member and the housing, allowing for easy inspection of the attached state and maintaining sealability, with a return spring and a bellows-shaped covering member that covers the shaft member and return spring, ensuring dustproof and waterproof properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an external packing is engaged with the trigger to improve dustproof and waterproof properties, then the sealing performance is improved, but the engaged portion becomes hidden behind the trigger making inspection difficult
Solution Approach 1:
The patent introduces a covering member as an intermediary component that covers the external packing. This covering member has one end attached to the trigger and the other end attached to the housing, creating a visual pathway that allows inspection of the external packing's engaged state without exposing the packing itself to direct contact or removal.
Solution Approach 2:
The patent shifts the inspection approach from direct visual access to the packing (zero-dimensional point inspection) to a multi-dimensional approach where the covering member's transparency or visual indicators allow inspection through multiple pathways and angles, making the hidden engaged state detectable.
2Reliability
If the external packing is engaged with the trigger, then the sealing performance is improved, but the assembly and trigger replacement become more complex
Solution Approach 1:
The patent divides the sealing system into three separate components: the external packing, the covering member, and the trigger. This segmentation allows the trigger to be replaced independently without disturbing the sealing components, while the covering member serves as a protective layer that simplifies the overall assembly structure.
Solution Approach 2:
The covering member is pre-installed on the trigger before final assembly, with its one end already attached to the trigger. This preliminary action ensures that when the trigger is replaced, the covering member can be quickly reattached without requiring complex reassembly of the sealing components.
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
Facilitates easy inspection of the attached state and maintains high protection properties, preventing foreign matter ingress and enabling efficient assembly and trigger replacement without compromising sealability.
Implementation Method 1
The covering member (5) is formed in a bellows shape, has its inside sealed, and is expandable and contractible in an axial direction
Data Source
AI summary
A trigger switch includes: a trigger that receives a pushing operation; a shaft member that supports the trigger on one end side thereof; and a housing in which a through hole is opened through which the other end side of the shaft member passes. The shaft member moves inside the housing due to the pushing operation on the trigger. The trigger switch includes a covering member that covers the shaft member in a circumferential direction, has its inside sealed, and is expandable and contractible in an axial direction. The covering member has one end side attached to an outer periphery of the shaft member and has the other end side attached to a periphery of the through hole of the housing.