Seat Cushion Switch Actuator for Operator-Presence Ignition Control
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Solution Overview
Problem
Existing seat assemblies in off-highway vehicles do not effectively integrate a mechanism to automatically control the ignition system based on the presence or absence of an operator, leading to potential unauthorized engine operation.
Innovation Solution
A seat assembly with a switch actuator mounted to the seat cushion that moves between actuating and non-actuating positions in response to the operator's seating, allowing the switch to open or close the ignition circuit accordingly, ensuring the engine can only operate when an operator is present.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a switch actuator is integrated into the seat cushion to automatically control the ignition system, then the safety and security against unauthorized operation is improved, but the device complexity increases
Solution Approach 1:
The switch actuator is integrated into the seat cushion structure, merging the safety control function with the existing seat assembly. This combination allows the ignition control to be embedded within the seat rather than being a separate system, thereby improving safety while minimizing the increase in overall device complexity.
Solution Approach 2:
The seat cushion serves multiple functions: it provides structural support for the operator and simultaneously houses the switch actuator mechanism that controls the ignition system. This multi-functionality allows the same component to fulfill both ergonomic and safety control roles, addressing the contradiction between improved safety and increased complexity.
2Reliability
If the switch actuator is mounted within the seat cushion cavity, then the unauthorized operation prevention is improved, but the manufacturing complexity increases
Solution Approach 1:
The switch actuator is nested within the cavity of the seat cushion, similar to a nested doll structure. This nesting approach allows the actuator to be housed within the existing seat cushion geometry without requiring separate mounting structures or additional external components, thereby improving security while keeping manufacturing processes relatively simple.
3Extent of automation
If the switch actuator moves between actuating and non-actuating positions in response to seating, then the automatic ignition control is improved, but the device complexity increases
Solution Approach 1:
The switch actuator is designed to automatically transition between actuating and non-actuating positions based on the physical act of seating. The operator's weight and presence directly drive the actuator movement, eliminating the need for additional sensors, actuators, or control systems. This self-service mechanism achieves automatic ignition control while minimizing the increase in device complexity.
Data Source
AI summary
A seat has a seat frame and a seat cushion supported by the seat frame. The seat cushion has an upper surface that supports a user and a lower surface defining a cavity. The seat cushion moves between an at rest condition in which no operator is seated on the seat, and a deflected condition in which the seat cushion is deflected with respect to the frame in response to an operator seated on the seat. A switch is mounted to the frame and opens and closes an electrical circuit in response to an actuating force. A switch actuator is mounted to the seat cushion lower surface in the cavity and moves between a non-actuating position when the seat is at rest and an actuating position when the seat is deflected. The switch actuator delivers the actuating force as the switch actuator is moved toward the actuating position.