Integrated Interlock Switch Design for Mounting Flexibility
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Solution Overview
Problem
Interlock switches with separable portions are prone to separation due to impacts, compromising safety, and face challenges in downsizing and mounting flexibility, while also needing to comply with Category 2 criteria of ISO 13849-1 for safety systems.
Innovation Solution
An interlock switch design featuring a detection unit integrated within the same casing as the operation unit, using optical or magnetic detection elements to ensure the switch remains operational and compact, with a circuit board for monitoring and signaling, allowing for reduced breakage and enhanced safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the interlock switch is configured with separable first portion and second portion, then the switch can be designed with rectangular-parallelepiped shape for mounting flexibility, but the switch becomes prone to separation due to impact forces
Solution Approach 1:
The patent merges the first portion (operation unit) and second portion (switch) into a single integrated structure, eliminating the separable interface that caused reliability issues. The operation unit is directly coupled to the switch mechanism within a unified housing, ensuring that impact forces cannot cause separation between portions while maintaining compact design.
2Reliability
If the interlock switch uses traditional contact module and plunger structure, then the switch can reliably transmit driving force, but the switch occupies large volume
Solution Approach 1:
The patent replaces the traditional mechanical contact module and plunger structure with a cam mechanism that directly actuates the switch. The cam's geometric profile converts rotational motion into linear displacement, eliminating the need for separate plungers and contact assemblies, thereby reducing overall switch volume while maintaining reliable force transmission.
Solution Approach 2:
The patent nests the operation unit and switch mechanism within a compact integrated housing, where components are arranged concentrically or in nested configurations. The cam mechanism is positioned within the operation unit assembly, and the switch is integrated into the same space, maximizing space utilization and minimizing external dimensions.
3Shape
If the interlock switch uses separable portions design, then the switch body can accommodate rectangular-parallelepiped shape, but design variations are required for different insertion positions
Solution Approach 1:
The patent designs the integrated switch with a universal mounting structure that can accommodate multiple insertion positions and orientations. The housing includes standardized mounting features and the operation unit is positioned to accept actuators from various directions, eliminating the need for separate design variations while maintaining the compact rectangular-parallelepiped form factor.
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 integrated detection unit within the interlock switch reduces the risk of separation and enables compliance with Category 2 safety standards by ensuring accurate operation and compact design, enhancing safety and flexibility in mounting.
Implementation Method 1
using optical or magnetic detection elements
Implementation Method 2
using optical or magnetic detection elements
Data Source
AI summary
A door switch includes a casing, a cam, the cam being caused to operate by manipulation of a manipulation key, and a detection unit for detecting an operating state of the cam. The casing houses at least a part of the cam and the detection unit. The cam is configured to be caused to operated by insert manipulation of inserting the manipulation key into the casing when the manipulation key has a shape adapted to a shape of the cam, and not to be caused to operate by the insert manipulation when the manipulation key does not have a shape adapted to the shape of the cam. The door switch can be adapted to Category 2 of ISO 13849-1.