Seat Sliding Device Multi-Latch Locking Mechanism
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Solution Overview
Problem
Existing seat sliding devices face challenges in enhancing lock strength while reducing weight, as they often require significant external forces to maintain the locking state and are prone to latch release due to moment-induced forces.
Innovation Solution
The seat sliding device incorporates a fixed rail with indentations and a movable rail featuring through-holes and latches, where the first latch serves as the main lock, with the second and third latches positioned at ends of the rail to reduce release moment and enhance lock strength, allowing for a lighter design by distributing external forces effectively across multiple engagement points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple latches are used to enhance lock strength, then the locking reliability improves, but the device weight increases
Solution Approach 1:
The locking mechanism is segmented into three separate latches (first, second, and third latches) distributed along the longitudinal axis. Each latch independently engages with corresponding indentations on the fixed rail, dividing the locking function into multiple segments that collectively enhance reliability while allowing each component to be optimized for minimal weight.
Solution Approach 2:
Each latch is positioned at a specific location along the longitudinal axis to optimize its individual function. The first latch is positioned to withstand the majority of external forces, while the second and third latches are positioned at ends to minimize release moments. This local optimization allows each latch to be designed with minimal thickness while maintaining overall locking reliability.
2Weight of moving object
If latch thickness is reduced to minimize weight, then the device weight decreases, but the lock strength is compromised
Solution Approach 1:
The locking function is segmented across three latches, allowing each latch to be thinner than a single latch would need to be to provide equivalent locking strength. The combined strength of multiple thin latches equals or exceeds that of a single thick latch, achieving weight reduction without compromising lock strength.
Solution Approach 2:
The locking strength of multiple thin latches is merged to provide the total required lock strength. By combining the strength contributions of three latches, each with minimal thickness, the system achieves the necessary lock strength while minimizing the weight that would result from using a single thicker latch.
3Reliability
If the second and third latches are positioned far from the first latch, then the locking coverage increases, but the release moment increases causing latch release
Solution Approach 1:
The positions of the second and third latches are locally optimized to be at the ends of the rail while maintaining appropriate distance from the first latch. This positioning provides maximum locking coverage at the extremes of the movable rail's travel range while keeping the distance sufficient to minimize release moments caused by deformation of the first latch.
4Strength
If the first latch withstands most external forces, then the main locking function is achieved, but the second and third latches may release due to induced moments
Solution Approach 1:
Each latch is given a specific local function: the first latch is positioned and dimensioned to withstand the majority of external forces applied to the movable rail, while the second and third latches are positioned at the ends to provide stability and prevent release. This differentiation of local functions ensures that the first latch's deformation does not cause release of the other latches.
Solution Approach 2:
The second and third latches are pre-positioned at the ends of the rail to counteract any release moments that may be induced by deformation of the first latch. Their positioning creates a stabilizing effect that prevents the chain reaction of latch release, acting in advance to counterbalance the harmful moments generated by the primary latch's load-bearing function.
Data Source
AI summary
Provided is a seat sliding device that includes a fixed rail, a movable rail, a first latch, a second latch, and a third latch. The first latch serves as a main lock. The second latch is positioned a distance from the first latch along a longitudinal axis of the fixed rail, and the third latch is positioned a distance from the first latch along the longitudinal axis.