Releasing Lever Dual Offset Protrusions for Sliding Device Stability
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Solution Overview
Problem
The existing releasing lever for vehicle seat sliding devices, with a single rotational contact protrusion, experiences stability and accuracy issues when switching between locked and non-locked states due to rotation around a central axis, leading to decreased performance.
Innovation Solution
A releasing lever with two offset protrusions, formed by cut-and-raised sections, serves as a pivot fulcrum, reducing rotation and enhancing stability and accuracy by providing a more stable pivot point when switching states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single rotational contact protrusion is used, then the structure is simple, but switching stability and accuracy deteriorate due to rotation around the central axis
Solution Approach 1:
The single rotational contact protrusion is divided into two separate protrusions (first protrusion and second protrusion) that are offset from each other in the width direction. Each protrusion contacts the inside wall surface of the movable rail, creating a stable pivot fulcrum that prevents rotation around the central axis while maintaining structural simplicity through integral formation.
2Ease of manufacture
If a single rotational contact protrusion is used, then the manufacturing process is simple, but switching accuracy deteriorates
Solution Approach 1:
The protrusions are formed as separate but integrated features on the releasing lever, with each protrusion having a specific offset position in the width direction. This segmentation provides precise contact points with the movable rail that ensure accurate switching while remaining compatible with standard plastic working processes like press working.
3Device complexity
If the releasing lever rotates around the central axis during operation, then the mechanism is simple, but switching stability decreases
Solution Approach 1:
The solution moves the pivot fulcrum from a single central axis to two offset contact points in the width direction. This dimensional change creates a stable triangular support structure with the movable rail, eliminating unwanted rotation around the central axis while maintaining the simplicity of the lever mechanism.
Data Source
AI summary
A releasing lever for a sliding device in one aspect of the present disclosure is used for the sliding device including a movable rail and a fixed rail. The releasing lever includes a first protrusion and a second protrusion. The first protrusion is formed in an intermediate portion of the releasing lever and protrudes in an abutting direction on a first end of the intermediate portion. The second protrusion is formed in a position offset from the first protrusion toward a second end of the intermediate portion, and protrudes in the abutting direction. The first protrusion and the second protrusion contact an inside wall surface of the movable rail at least when the releasing lever pivots.