Foot Switch Latch Mechanism Prevents Accidental Activation
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Solution Overview
Problem
Conventional foot switches for adjusting medical instruments like sickbeds and clinic chairs lack a security mechanism, leading to accidental activation and potential safety risks when operators are busy or distracted.
Innovation Solution
A foot switch with a security mechanism that requires simultaneous pressing of a latch and pedal to generate an electrical connection, preventing accidental activation, and featuring ergonomic key placement to reduce mistaken steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional foot switch is provided without a security mechanism, then the operator can easily adjust the height and inclination angle of the sickbed or clinic chair, but the foot switch may be accidentally stepped on when the operator is busy or distracted, causing safety risks
Solution Approach 1:
The latch mechanism is positioned and configured in advance such that it must be pressed first to unlock the circuit connection. This preliminary action ensures that the pedal cannot activate the circuit board unless the latch is deliberately engaged first, preventing accidental activation while maintaining ease of operation through the ergonomic positioning of the latch above the pedal.
2Reliability
If a latch mechanism is added to prevent accidental activation, then the safety risk is reduced, but the device complexity increases
Solution Approach 1:
The latch mechanism is merged with the existing pedal assembly structure. The latch is positioned above the pedal and integrated into the same housing, sharing common structural elements with the pedal assembly. This merging approach adds the safety function without creating a completely separate mechanism, thereby limiting the increase in device complexity.
3Device complexity
If the latch and pedal are positioned close together, then the device structure is compact, but the operator may press both simultaneously by mistake
Solution Approach 1:
The latch is positioned asymmetrically above the pedal rather than directly adjacent to it, creating a vertical arrangement that is ergonomically optimized. This asymmetric positioning ensures that the natural foot motion can easily engage the latch first, while the pedal is positioned lower and requires a different pressure point, making simultaneous accidental pressing unlikely while maintaining compact overall dimensions.
Data Source
AI summary
A foot switch having a security mechanism includes a main body, a circuit board, a pedal and a latch. The circuit board is received in the main body. The pedal is provided on the main body. The latch is provided adjacent to the pedal. The pedal is electrically connected to the circuit board via the latch. When the latch and the pedal are pressed, the circuit board is electrically connected to the pedal. The pedal can only generate an unlocking action via the latch, whereby the circuit board is electrically connected to the pedal to output a driving signal. Thus, the foot switch of the present invention can be prevented from being stepped on by mistake, thereby enhancing the safety in use.