Push Switch Component Integration for Reliability
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Solution Overview
Problem
Conventional push switches have a high number of components, which can lead to increased complexity and potential for mechanical failure and electrical short-circuits.
Innovation Solution
A push switch design with a reduced number of components, featuring a hollow housing with guide parts, an operation button with ratchet teeth, a cam follower, a metallic contact member, and a base with a rotation axis, where the contact member functions as both an operation and movable contact, and a spring system to prevent inclination and short-circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of components is reduced, then device complexity is reduced and reliability is improved, but the functional integration becomes more difficult to achieve
Solution Approach 1:
The contact member integrates multiple functions: it serves as both the movable contact for electrical switching and the operation member that transmits mechanical force to the cam follower. This merging of functions reduces the total component count while maintaining operational reliability, as the integrated design eliminates potential failure points from additional connections between separate components.
Solution Approach 2:
The contact member is designed with multi-functionality, acting simultaneously as an electrical contact element and a mechanical operation element. This universal component performs both electrical switching and mechanical actuation functions, thereby reducing device complexity without compromising the reliability of either function.
2Quantity of substance
If the contact member serves as both operation member and movable contact, then the number of components is reduced, but the risk of short-circuit increases
Solution Approach 1:
The rotation axis part acts as an intermediary element between the contact member and the base. It provides a non-conductive or controlled conductive path that allows rotational movement while preventing direct electrical contact between the movable contact and the base, thereby eliminating the short-circuit risk even though the contact member integrates multiple functions.
Solution Approach 2:
The electrical contact function is extracted and isolated from the mechanical operation function through the rotation axis part. This separation ensures that the metallic contact portion can only make contact with fixed contacts at appropriate times during rotation, preventing unintended short-circuits while maintaining the reduced component count.
3Manufacturing precision
If the cam follower is restricted from returning, then switching precision is improved, but the ease of operation is reduced
Solution Approach 1:
The return restriction mechanism is designed to be dynamic rather than static. The cam follower is restricted from returning only during the specific phase when precision switching is required, while allowing free return movement during other phases. This dynamic control maintains switching precision without permanently compromising operational ease.
Solution Approach 2:
The return restriction is applied periodically rather than continuously. The cam follower experiences restricted return movement only during specific cycles when precision switching is needed, while maintaining unrestricted operation during other cycles. This periodic application preserves both switching precision and operational ease.
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 design reduces the number of components, enhances mechanical reliability, and prevents unnecessary short-circuits, resulting in a simpler and more reliable push switch operation.
Implementation Method 1
a first spring urging the cam follower to come close to the operation button in a return direction so as to mesh the first ratchet tooth and the second ratchet tooth with each other
Data Source
AI summary
A push switch includes: a hollow housing having an inner circumferential surface formed with a guide part; an operation button formed with a first ratchet tooth; a cam follower including a cam part, and a second ratchet tooth, and being movable up and down in an axial direction and rotatable in a circumferential direction; a first spring; an engagement piece engaged with the cam follower; a movable contact; a metallic contact member rotatable integrally with the cam follower; a fixed terminal including contacts to be switched by rotating the contact member; and a base on which the fixed terminal is fixed. The contact member defines a through hole at a rotation center of the contact member. The base includes a rotation axis part inserted in the through hole and serving as the rotation center of the contact member.