Vehicular Door Trim Armrest Wrinkle Prevention
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Solution Overview
Problem
In vehicular door trims with armrests, fitting mounting members from the rear surface side can cause wrinkles or crinkles in the surface skin due to rubbing, as the skin is pushed upward during the mounting process from the lower side.
Innovation Solution
A vehicular door trim design featuring a mounting hole with an inner surface recess and a fitting projection on the mounting member, where the surface skin is extended to cover the opening edge of the hole, allowing the projection to fit into the recess and be held between the recess and the projection, preventing upward movement and wrinkling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the mounting member is fitted to the mounting hole from the lower side (rear-surface side), then the mount portion can be freely designed without affecting aesthetic appearance, but wrinkles or crinkles are caused on the surface skin due to rubbing during the fitting process
Solution Approach 1:
The patent introduces a guide projection as an intermediary element that mediates between the mounting member and the surface skin. The guide projection fits into a guide hole and guides the mounting member during insertion, preventing direct contact and rubbing between the mounting member and the surface skin, thereby eliminating wrinkles while maintaining the benefits of lower-side mounting
Solution Approach 2:
The patent replaces the direct mechanical contact and rubbing mechanism with a guided insertion mechanism. Instead of the mounting member directly rubbing against the surface skin, the guide projection and guide hole create a controlled mechanical path that eliminates harmful friction and contact, substituting the harmful mechanical interaction with a beneficial guiding mechanism
2Object-affected harmful factors
If the mounting member is fitted to the mounting hole from the upper side (front-surface side), then the surface skin is not affected by rubbing, but the mount portion formation restricts design freedom and aesthetic appearance
Solution Approach 1:
The guide projection acts as an intermediary that enables lower-side mounting without the harmful effects. It provides a protective mechanism during the fitting process, allowing the mounting member to be inserted from the lower side while preventing direct contact with the surface skin, thus combining the advantages of both mounting directions
Data Source
AI summary
A vehicular door trim includes a trim body having a mounting portion, an armrest projecting toward a compartment inner side and including an upper wall portion having amounting hole therethrough, the armrest including a fitting recess at an opening edge of the mounting hole, a mounting member fitted to the mounting hole and including a fitting projection on its one end portion and including a fitting portion on its another end portion, the fitting projection fitted to the fitting recess and the fitting portion fitted to the mounting portion, and an armrest surface skin covering at least an upper surface of the upper wall portion and includes an surface skin extended portion covering the opening edge of the mounting hole and a part of the fitting recess, and the part of the fitting recess and the fitting projection hold a part of the surface skin extended portion.