Seat Device Pressing Member for Switch Durability
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Solution Overview
Problem
The existing seat devices with pressure sensitive switches often experience durability issues due to incorrect detection of objects lighter than humans and excessive pressure from heavier individuals, leading to degradation of the switches.
Innovation Solution
A seat device design featuring a cushion pad, a support member, and a pressing member that deforms to apply pressure to the switch, with a greater displacement in the second stage after the switch is turned on, reducing false detections and distributing pressure to enhance switch durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure sensitive switch is disposed inside the seat cushion, then the load is dispersed and durability is improved, but wrong detection occurs frequently when objects lighter than humans are placed
Solution Approach 1:
The pressing member acts as an intermediary between the cushion pad and the pressure sensitive switch. It transmits pressure from the cushion pad to the switch while providing mechanical advantage through its deformation characteristics, enabling the switch to be positioned inside the cushion for durability while maintaining detection accuracy through controlled pressure transmission
Solution Approach 2:
The pressing member's deformation characteristics are optimized to change pressure transmission parameters. By designing the pressing member with specific elasticity and deformation properties, the system transforms the distributed pressure from the cushion into concentrated pressure on the switch only when sufficient weight is applied, distinguishing between light objects and human weight
2Strength
If the pressure sensitive switch is disposed inside the seat cushion, then no large load is locally applied, but excess pressure continuously degrades the switch durability
Solution Approach 1:
The pressing member introduces dynamic pressure distribution. Its deformation characteristics allow it to adapt to varying loads, providing sufficient pressure for switch activation when needed while relaxing pressure during continuous loading, thereby preventing degradation while maintaining structural integrity
Solution Approach 2:
The pressing member creates periodic pressure cycles on the pressure sensitive switch. As the cushion compresses and rebounds, the pressing member deforms and recovers, applying pressure to the switch in a periodic manner rather than continuous static pressure, which reduces cumulative degradation
3Reliability
If the deformed amount of the pressing member per unit displacement is greater in the second stage, then the pressing force is relaxed to improve durability, but the detection sensitivity must be maintained
Solution Approach 1:
The pressing member exhibits different deformation characteristics at different stages of compression. In the first stage (before switch activation), it has lower deformed amount per unit displacement to build pressure. In the second stage (after activation), it has greater deformed amount to relax pressure, creating localized pressure management at the switch interface
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 design effectively differentiates between a person and an object, reduces false alarms, and extends the durability of the pressure sensitive switch by managing pressure distribution and displacement.
Implementation Method 1
a pressing member disposed below the cushion pad, the pressing member being deformed by a pressure applied from the under face of the cushion pad to press the pressure sensitive switch
Data Source
AI summary
A seat device 5 according to the present invention includes a cushion pad 60, a support member 70 for supporting the cushion pad 60, a pressure sensitive switch SW disposed with a spacing from the under face of the cushion pad, and a pressing member 90 disposed below the cushion pad 60 and deformed by a pressure applied from the under face of the cushion pad to press the pressure sensitive switch SW. The deformed amount of the pressing member 90 per unit displacement amount in which the under face of the cushion pad is displaced downwardly is greater in a second stage after the pressure sensitive switch SW is turned on than in a first stage before the pressure sensitive switch SW is turned on.