Seat Belt Buckle Switch With Rotary Brush Contact Detection
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Solution Overview
Problem
Existing seat belt buckle switches require a large operation range matching the movable range of the tongue plate, leading to increased size and inefficiency.
Innovation Solution
A seat belt attachment/detachment detection switch comprising a printed circuit board, a rotor with a lever and electric brush, and movable plates, where the rotor rotates to detect attachment/detachment by changing contact states with conductive parts on the circuit board, reducing size and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the switch operation direction is aligned with the tongue plate operation direction, then the switch can detect attachment/detachment states, but the switch operation range must match the tongue plate movable range causing increased size
Solution Approach 1:
The patent changes the detection mechanism from linear sliding motion to rotational motion. The rotor rotates in response to tongue plate insertion, and the electric brush contacts different electrode regions at different rotation angles to detect attachment/detachment states. This dimensional change from linear to rotational motion allows compact design while maintaining detection accuracy.
Solution Approach 2:
Instead of having the switch slider move in the same direction as the tongue plate (conventional approach), the patent inverts the detection mechanism by using a rotor that rotates perpendicular to the tongue plate insertion direction. The electric brush remains relatively stationary while the rotor rotates, bringing different electrode regions into contact with the brush to detect states.
2Reliability
If a conventional slider structure is used to detect tongue plate insertion, then attachment/detachment can be detected, but the device complexity and size increase
Solution Approach 1:
The patent merges the detection function into a compact rotor-electric brush assembly. The rotor integrates the lever mechanism that responds to tongue plate insertion, and the electric brush contacts the rotor surface to detect rotation-induced changes in electrode contact. This merging of detection components reduces overall device complexity compared to separate slider and detection mechanism.
Solution Approach 2:
The patent replaces the conventional mechanical slider system with an electro-mechanical detection system using a rotor and electric brush. The electric brush contacts conductive regions on the rotor to generate electrical signals that indicate attachment/detachment states, substituting pure mechanical sliding with a combination of rotational mechanics and electrical detection.
Data Source
AI summary
A seat belt attachment/detachment detection switch including a printed circuit board including a circuit for detecting attachment/detachment of a seat belt; a movable plate configured to slidably move along with insertion of a tongue plate of the seat belt; a rotor including a lever coupled to the movable plate, the rotor being rotatably attached to the printed circuit board to rotate as the tongue plate is pushed into a buckle; and an electric brush attached to the surface of the rotor that faces the printed circuit board, the electric brush having leg parts that change a state of contact/non-contact with a conductive part of the circuit in accordance with a rotating state of the rotor.