Single-Latch Seat Locking for Two-Position Backrest Adjustment
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Solution Overview
Problem
Existing vehicle seat locking devices with the capability to change the backrest angle in two levels have complex configurations due to the use of multiple parts, such as two hook plates engaging with bar-shaped portions of a striker.
Innovation Solution
A vehicle seat locking device with a simplified configuration, utilizing a single latch that engages with a striker, allowing the backrest angle to be changed in two levels by pivoting through specific latching positions, with auxiliary mechanisms to secure the striker in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple hook plates are used to engage with bar-shaped portions of a striker, then the backrest angle can be changed in two levels, but the device configuration becomes complex
Solution Approach 1:
The patent combines multiple hook plates into a single latch component that integrates the functionality of both the first and second hook plates. This single latch engages with the striker to provide two distinct latching positions, thereby reducing the number of parts while maintaining the two-level backrest angle adjustment capability.
Solution Approach 2:
The single latch is designed to perform multiple functions: it provides both the first latching position and the second latching position for the backrest angle adjustment. The latch engages with the striker at different positions to achieve the same functional outcome of securing the backrest at different angles, eliminating the need for separate hook plates.
2Adaptability or versatility
If multiple hook plates are used to engage with bar-shaped portions of a striker, then the backrest angle can be changed in two levels, but the number of parts increases
Solution Approach 1:
The patent merges the first hook plate and second hook plate into a single integrated latch component. This reduction in part count simplifies the overall structure while preserving the two-level angle adjustment function through the latch's ability to engage with the striker at two different positions.
Solution Approach 2:
The single latch is segmented into functional regions that correspond to the first and second latching positions. The latch includes a latch body with engagement surfaces that interact with the striker at different locations, effectively dividing the locking function into two distinct positions without requiring separate physical components.
Data Source
AI summary
Disclosed is a vehicle seat locking device including: a single latch having an engaging groove and first through third arm portions; a ratchet having a restraining portion engaging the first and second arm portions, restraining the latch in first and second latching positions respectively; and an engagement auxiliary lever having a first auxiliary arm portion abutting with a leg portion of a striker and a second auxiliary arm portion pivoting by this abutment. The latch pivots from an unlatching position to the first latching position by engaging its engaging groove with the leg portion entered a striker entering groove of a baseplate, and pivots to a second latching position by the pivot of the second auxiliary arm portion. The leg portion exits the engaging groove by the pivot of the latch to the second latching position to be clamped between the engagement auxiliary lever and the third arm portion.