Sliding Emergency Switch Cover for Accessible False-Alarm Prevention
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Solution Overview
Problem
Existing cover devices for help call buttons in rail vehicles, designed to prevent unintentional activation, are difficult for people with limited mobility to operate as they require manual dexterity to fold or open, and are prone to damage or false alarms.
Innovation Solution
A sliding cover device mounted on a cover holder, allowing the cover to move from a closed to an open position along a predetermined path, enabling easy removal and actuation of the trigger button using the stump of an arm or the ball of the hand, with a spring mechanism to return to the closed position and a design that resists vandalism and injury risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cover is used to protect the trigger button, then protection against unintentional actuation is improved, but ease of operation deteriorates for people with limited mobility
Solution Approach 1:
The cover is designed to be movable along a guide from a closed rest position to an open position, transforming from a static protective barrier to a dynamic component that can be easily displaced. The spring element provides automatic return to the closed position, creating a dynamic system that maintains protection while allowing easy access when needed.
Solution Approach 2:
The guide acts as an intermediary mechanism between the cover and the trigger button, controlling the cover's movement along a predetermined curve. This intermediary structure enables the cover to be easily moved by simple forces (such as pushing with the palm or arm stump) while still providing effective protection when closed.
2Reliability
If a cover flap is used for protection, then protection against accidental activation is improved, but robustness deteriorates as it is easily broken or damaged
Solution Approach 1:
The cover is designed as a movable component that slides along a guide rather than a fixed or hinged flap. This dynamic design with spring return provides both protection and inherent robustness, as the spring mechanism and guided movement prevent the cover from being easily broken or damaged during normal use or accidental impacts.
3Reliability
If a complex cover mechanism is used to prevent accidental actuation, then protection is improved, but device complexity increases
Solution Approach 1:
The cover device is segmented into distinct functional components: the cover itself, the guide, and the spring element. Each component has a specific, simple function, and together they create an effective protection mechanism without requiring complex integration or control systems.
Solution Approach 2:
The spring element provides automatic return of the cover to its closed rest position after being opened, eliminating the need for additional mechanisms to reset the cover. This self-service feature reduces device complexity while maintaining reliable protection against accidental actuation.
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 solution effectively prevents unintentional triggering while allowing intuitive and robust intentional activation, reducing false alarms and ensuring ease of use for individuals with limited mobility without posing injury risks.
Implementation Method 1
the cover device comprises a spring which is pretensioned such that it exerts a force on the cover which acts in the direction of displacement of the cover from the open position to the closed rest position
Data Source
Figure 1~2
AI summary
The invention relates to a cover device (1) for a trigger button (5) to protect against unintentional actuation, comprising a cover (2) and a cover holder (3), the cover (2) being movable from a closed idle position into an open position, the cover being arranged on the cover holder (3) so as to be displaceable relative to the cover holder (3) such that the cover is displaceable from the closed idle position into the open position. The invention also relates to a facility for calling for help having a cover device, as well as to a rail vehicle having a facility for calling for help, and to a method for operating a facility for calling for help.