Safety Switch Device With Evaluation Circuit For Panic Mode Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing mobile hand-operated devices for issuing potentially dangerous control commands lack robust safety features, particularly in detecting the functioning of the panic operating mode, leading to potential safety risks due to unintentional enablement and undetected faults, and often require complex designs to ensure safety.
Innovation Solution
A safety switch device with an evaluation circuit and enable buttons that require distinct operating forces and displacement distances to switch between idle, enable, and panic modes, ensuring that the panic mode is reliably detected before enabling signals can be output, and incorporating redundant detection circuits to prevent single faults from causing safety failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical solutions for enable buttons with dual-circuit and three-stage design are used to ensure safety, then reliability is improved, but device complexity increases and construction size increases
Solution Approach 1:
The patent replaces the purely mechanical switching operation with an electronic evaluation circuit that processes signals from a simplified switch mechanism. The evaluation circuit implements the dual-circuit logic and three-stage state management electronically, eliminating the need for complex mechanical linkages and moving parts while maintaining safety functionality.
Solution Approach 2:
The patent separates the switching function from the evaluation function. The switch mechanism is simplified to only detect button states, while the electronic evaluation circuit handles the complex logic of determining enablement states, panic states, and safety validation. This segmentation allows each component to be optimized independently.
2Reliability
If purely mechanical switching operation is used for enable buttons, then reliability is improved, but device complexity increases and manufacturing cost increases
Solution Approach 1:
The patent replaces complex mechanical switching mechanisms with a simplified switch coupled to an electronic evaluation circuit. The electronic circuit performs the safety-critical evaluation functions that would otherwise require intricate mechanical designs, thereby reducing manufacturing complexity and cost while maintaining or improving reliability.
Solution Approach 2:
The patent changes the state detection from purely mechanical position detection to electrical signal detection. By using electrical contacts and electronic evaluation, the system achieves the same safety functions with simpler mechanical components and lower manufacturing costs.
3Ease of operation
If enable buttons are ergonomically integrated in the hand-operated device for effortless operation, then ease of operation is improved, but safety risk increases due to potential unintentional enablement
Solution Approach 1:
The patent implements different operating characteristics for different regions or states of the enable button. The button has distinct force thresholds and displacement requirements for transitioning between idle, enable, and panic states. This local differentiation of mechanical properties allows ergonomic operation while preventing unintentional activation.
Solution Approach 2:
The evaluation circuit continuously monitors the state of the enable button and provides feedback control. The system only permits machine operation when the enable button is intentionally activated, and immediately halts operation when released or switched to panic mode. This feedback mechanism ensures that ergonomic buttons cannot cause unintentional enablement.
4Device complexity
If detection of panic operating mode is not implemented, then device complexity is reduced, but reliability deteriorates due to undetected faults
Solution Approach 1:
The evaluation circuit proactively detects and validates the panic operating mode capability before permitting enablement. The system checks that the panic function is operational and ready to interrupt machine operation if needed. This preliminary detection ensures safety functionality is verified in advance rather than relying on post-factum detection.
Solution Approach 2:
The evaluation circuit continuously monitors the panic button state and provides feedback to the control system. When the panic button is pressed, the circuit immediately detects this state and triggers interruption of machine operation. This continuous feedback ensures that panic functionality remains reliable and responsive.
Data Source
AI summary
The invention relates to a method of operating a mobile hand-operated device (9) provided as a means of outputting or enabling potentially dangerous control commands to a controllable technical device (1) actively connected to it or to another hand-operated device(9′). A safety switch device (16) . . . comprising at least one evaluation circuit and at least one enable button (18) connected to the evaluation circuit for transmitting signals is provided, which has an idle mode which is assumed automatically without applying operating force and two consecutive operating modes set on the basis of a differing strength of operating force and/or by different displacement distances in the form of an enable operation mode and a panic operating mode. Either an active mode is assigned to the at least one enable button (18) in which an enabling mode for running potentially dangerous control commands can be signalled or made available when the enable operation mode is assumed, or an inactive mode in which signalling or availability of the enabling mode is suppressed or not possible. When or after the evaluation circuit has detected on the basis of signals that the panic operating mode or the panic operating mode and the idle mode has been assumed, the active mode is assigned to the respective enable button (18). Also specified is a corresponding mobile hand-operated device (9, 9′) and a corresponding safety switching device (16).