Actuatorless Safety Switch with Integrated Screw Drive
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Solution Overview
Problem
Existing safety switch arrangements in safety technology require additional mechanical units like actuators for securing access to hazardous areas, increasing structural complexity and costs while aiming for fail-safe operations.
Innovation Solution
A safety switch design that integrates a screw drive with a motor and threaded spindle, eliminating the need for an actuator by using a locking element and link to convert rotary motion into linear movement for locking and unlocking, ensuring reliable and reproducible control of the locking position without external mechanical units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an actuator is added to the safety switch arrangement to secure access to hazardous areas, then the locking function is improved, but the structural complexity increases
Solution Approach 1:
The patent combines the actuator function directly into the safety switch housing. The actuator is received within the housing and integrated with the internal mechanism, eliminating the need for separate external actuators while maintaining the locking function. This merging reduces structural complexity while preserving reliability.
Solution Approach 2:
The safety switch is designed to perform multiple functions: it provides both the switching function for safety monitoring and the actuating function for locking/unlocking the protective door. The integrated actuator allows the same device to both detect safety conditions and mechanically secure the protective enclosure, reducing the need for additional components.
2Reliability
If additional mechanical units like actuators are used in safety switch arrangements, then the locking capability is enhanced, but the costs increase
Solution Approach 1:
By integrating the actuator within the safety switch housing and combining multiple functions into a single device, the patent reduces the total number of components that need to be manufactured, assembled, and tested. This integration lowers manufacturing costs while maintaining enhanced locking capability.
3Device complexity
If the safety switch integrates internal locking mechanism without external actuators, then the structural complexity is reduced, but the locking reliability must be maintained
Solution Approach 1:
The actuator is received within the housing and integrated with the locking mechanism internally. The first RFID reading unit detects the locking position by interacting with the actuator, ensuring reliable monitoring while maintaining a compact integrated structure without external actuators.
Solution Approach 2:
The safety switch includes an RFID reading unit that detects the position of the actuator to determine whether the protective door is locked or unlocked. This feedback mechanism ensures reliable locking monitoring while using an integrated internal structure rather than external actuators.
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 reduces structural complexity and costs while ensuring a fail-safe locking mechanism that meets normative requirements for safety technology, allowing secure access control to hazardous areas with reduced effort and enhanced reliability.
Implementation Method 1
This locking is checked by detecting a transponder in the actuator with an RFID reader in the safety switch
Implementation Method 2
The screw drive is connected to the locking element via a link, with the movement of the threaded spindle being converted into a linear movement of the locking element by the link
Data Source
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AI summary
The invention relates to an actuatorless safety switch (1) for a separating protective device, comprising means for monitoring the locking position of a component of the separating protective device and a holding unit. The holding unit has a holding element that can be moved into a holding position. The holding position causes a movable component of the separating protective device to be held in place.