Thermo-Mechanical Heating Switch with Click Spring Reactivation
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Solution Overview
Problem
Existing temperature-controlled devices for switching off heating devices at a limit temperature lack reliable and practical means for reactivation, posing safety concerns and operational inefficiencies.
Innovation Solution
A temperature-controlled device incorporating a thermo-mechanical temperature sensor, a switch-off mechanism, and manual reactivation means with a click spring and transmission system that allows for safe and controlled reactivation of the heating device by an operator, preventing unintended blocking of the switching mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual reactivation means are added to allow operator intervention, then ease of operation is improved, but reliability deteriorates due to potential blocking of the switching mechanism
Solution Approach 1:
A click spring is introduced as an intermediary element between the handle and the switching means. The click spring has a basic position where it transmits the operating force from the handle to reactivate the switching means, and a deflected position where it releases the switching means to prevent blocking. This intermediary mechanism allows manual reactivation while maintaining safety against unintended blocking.
2Ease of operation
If the handle is made movable for reactivation, then ease of operation is improved, but device complexity increases due to transmission means
Solution Approach 1:
The transmission means is segmented into distinct functional elements: the movable handle, the click spring with its basic and deflected positions, and the switching means. This segmentation allows each component to perform its specific function independently, simplifying the overall design while maintaining the required functionality for manual reactivation.
3Reliability
If the click spring is made monostable with automatic return, then reliability is improved by preventing blocking, but ease of operation deteriorates due to limited handle movement
Solution Approach 1:
The click spring performs periodic action by automatically returning from the deflected position to the basic position after the handle is released. This periodic return ensures that the switching means is consistently prevented from being blocked, while the handle movement is constrained to a controlled range that is sufficient for operation but limited to maintain safety.
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
Enables reliable and safe reactivation of the heating device, ensuring continued operation without risking safety functions, by using a click spring that automatically returns to its basic position, preventing overactivation and maintaining safety even when the handle is depressed.
Implementation Method 1
The temperature sensor device has a thermo-mechanical temperature sensor such as is known above all from the prior art, and a trigger. The thermo-mechanical temperature sensor can be rod-shaped from elements having dissimilar coefficients of expansion
Implementation Method 2
The transmission means have a click spring which in the line of an operating force that acts thereon from the handle, up to a certain or predefined limit force, is in a basic position which is or forms a first position
Data Source
AI summary
A temperature-controlled device for switching off a heating device at a limit temperature has a thermo-mechanical temperature sensor device, a switch-off device, and manual reactivation means. The switch-off device has switching means which are activated by a trigger for switching off the heating device. The manual reactivation means have a movable handle and transmission means for transmitting a force of an operator for reactivating the switching means after switching off the heating device by the trigger. The transmission means have a click spring which at the beginning is in a basic position and, when an operating force acting on said click spring exceeds a certain limit force, clicks to a deflected position. Said click spring in the basic position enables reactivating or re-switching on, respectively, of the switching means. Said click spring in the deflected position releases so much movement path on the transmission means for the switching means that said switching means by the temperature sensor device and by the switch-off device above the limit temperature are activatable and switchable by the trigger.