Seat Lock Device Anti-Wobble Cam Plate Mechanism
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Solution Overview
Problem
The existing seat lock device has a heavy open lever due to its structure, leading to degraded operability when releasing the striker from the hook member, and it experiences wobbling issues during vibrations or impacts, resulting in continuous noise.
Innovation Solution
A seat lock device with a cam plate that moderately presses the hook member to prevent wobbling, an interlock mechanism that limits the hook member's turning, and a sensing lever that ensures proper operation timing and engagement confirmation, allowing for a smaller and lighter open lever.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the open lever is designed to engage with the striker before the hook member, then the engagement state is maintained during vibration or impact, but the open lever size and weight increase, degrading operability
Solution Approach 1:
The patent divides the lever system into two separate components: the open lever and the sensing lever. The sensing lever handles the striker engagement detection and prevention of premature disengagement, while the open lever is dedicated solely to releasing the hook member. This segmentation allows the open lever to be smaller and lighter, improving operability, while the sensing lever ensures reliable engagement maintenance during vibration or impact.
2Reliability
If the open lever is made larger to improve engagement stability, then reliability increases, but the operating load increases and operability degrades
Solution Approach 1:
The patent segments the functions of engagement stability and lever operation into different components. The sensing lever, with its stopper pin and inclined surface, provides engagement stability and prevents premature disengagement during vibration. The open lever is designed to be lighter and easier to operate, dedicated solely to releasing the hook member through the interlock pin mechanism.
3Difficulty of detecting and measuring
If the hook member is allowed to turn freely within gaps, then the sensing lever can detect engagement status, but wobbling occurs causing continuous noise during vehicle travel
Solution Approach 1:
The patent introduces the cam plate as an intermediary component between the hook member and the sensing lever. The cam plate's cam surface contacts the sensing lever's inclined surface to transmit engagement status information, while the clearance groove in the cam plate allows controlled movement. This intermediary mechanism enables engagement detection while preventing excessive hook member wobbling that causes noise during vehicle travel.
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 improves operability by reducing the weight and size of the open lever, preventing wobbling, and maintaining the locked state during vibrations or impacts, thus enhancing the overall performance of the seat lock device.
Implementation Method 1
a hook member (20) elastically rotationally biased
Implementation Method 2
the hook member is moderately pressed by the cam surface of the cam plate, and wobbling is prevented
Implementation Method 3
The seat lock device may have a sensing lever elastically rotationally biased in the positive direction
Data Source
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AI summary
A seat lock device 10 includes a hook member 20 rotationally biased in a positive direction, a cam plate 50, a sensing lever 70, and an open lever 100 rotationally biased in a negative direction. The hook member 20 has a hook inclined edge surface 24 that is rotationally biased in the negative direction by contact with a first striker 14a entering, an engaging groove 26 with a depth into which the first striker 14a fits after crossing the hook inclined edge surface 24 to bring the hook member 20 into a locked position, and a restraining pin 28 and an interlock pin 30 protruding sideways. The cam plate 50 has a cam surface 54 that comes into contact with the restraining pin 28 to rotationally bias the hook member 20 in the positive direction when the hook member 20 is at the locked position, and an interlock surface 56 with which the interlock pin 30 comes into contact before the first striker 14a escapes from the engaging groove 26 when the hook member 20 receives vibration or impact to cause the restraining pin 28 to turn in the negative direction while pressing the cam surface 54.