Cover material fixing device and conveyance seat
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Solution Overview
Problem
Existing cover material fixing devices for vehicle seats increase in size in the width direction due to the placement of rotation preventing portions, leading to a demand for a solution that prevents separation of fixing members while minimizing size expansion.
Innovation Solution
A cover material fixing device featuring a first fixing member with an insertion portion and a second fixing member with a holding portion, where the insertion portion includes a rotation restricting portion to prevent separation and is fitted in the thickness direction, with a protruding surface for easy insertion and a locking mechanism to enhance engagement force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rotation preventing portion is disposed on the side opposite to the locking portion in the thickness direction of the fixing member, then the fixing member can prevent rotation and separation of the cover material, but the cover material fixing device increases in size in the width direction of the vehicle seat
Solution Approach 1:
The invention moves the rotation preventing portion from the thickness direction (width direction of seat) to the length direction (front-rear direction of seat) by making the insertion portion protrude in the length direction and engage with a groove portion extending in the length direction. This dimensional change maintains the rotation prevention function while eliminating the increase in width direction size.
Solution Approach 2:
The insertion portion is inserted into the groove portion of the fixed member, creating a nested structure where the fixing member is contained within the groove. This nesting approach provides rotation prevention through the groove walls while keeping the overall width direction dimensions compact.
2Strength
If the insertion portion is fitted and held by the holding portion in the thickness direction of the first fixing member, then the engagement force is enhanced, but the structure becomes more complex
Solution Approach 1:
The fixing system is divided into two functional segments: the insertion portion that protrudes and engages with the groove for rotation prevention, and the locking portion that provides additional securing. This segmentation allows each part to perform its specific function efficiently without requiring a complex integrated structure.
Solution Approach 2:
Instead of having the holding portion actively grip the insertion portion from multiple directions, the design inverts the approach by having the insertion portion passively engage with the groove portion through friction and geometric constraint, with the locking portion providing supplementary retention. This inversion simplifies the overall structure while maintaining engagement strength.
Data Source
AI summary
A cover material fixing device includes: a first fixing member that is formed in a plate shape so that the first fixing member is connected to a first cover material at a first connection portion of one end portion and has an insertion portion formed at the other end portion; and a second fixing member that is disposed on a groove portion of a fixed member, is provided along the first fixing member, and includes a holding portion holding the insertion portion. The insertion portion is inserted and engaged with the holding portion so that the first cover material is fixed to the fixed member and the insertion portion of the first fixing member includes a rotation restricting portion for the holding portion.