Vehicle Seat Lid Attachment via R-Chamfered Cover Flange
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Solution Overview
Problem
Existing vehicle seat designs with ISOFIX anchors face challenges in attaching a lid member with good appearance and workability, particularly when an R-chamfered portion is used, as it increases the gap between the cover member and the lid member, affecting the design's aesthetics and functionality.
Innovation Solution
A vehicle seat design featuring a through hole with a cover member having a front plate portion and a tubular side plate portion, where the R-chamfered portion guides the attaching member into the hole, and the lid member is attached such that its outer edge abuts the side plate portion at a position rear to the R-end point, minimizing the gap and enhancing appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an R-chamfered portion is provided at the inner corner portion of the flange portion of the cover member to enable smooth insertion of the attaching member, then the attaching workability is improved, but the gap between the inner side of the flange portion and the outer peripheral edge portion of the lid member becomes larger, deteriorating the appearance design
Solution Approach 1:
The flange portion is divided into multiple regions: an R-chamfered portion at the inner corner for guiding the attaching member, a flat portion adjacent to it for supporting the lid member, and a position relationship where the flat portion extends rearward from the R-chamfered portion. This segmentation allows each region to fulfill its specific function independently, resolving the contradiction between insertion smoothness and appearance.
Solution Approach 2:
Different portions of the flange portion are given different geometric qualities: the inner corner has an R-chamfered shape for smooth insertion, while the adjacent flat portion provides a stable support surface for the lid member. This local differentiation of geometric properties allows the cover member to simultaneously achieve both attaching workability and appearance design requirements.
2Shape
If the lid member is disposed at an inner side of the flange portion of the cover member to minimize protrusion and meet design demands, then the external appearance is improved, but the attaching member may be caught by the flange portion, reducing attaching workability
Solution Approach 1:
The R-chamfered portion is provided in advance at the inner corner of the flange portion to preemptively guide the attaching member during insertion. This preliminary geometric preparation ensures that the attaching member follows the intended path and avoids being caught by the flange portion, even when the lid member is positioned at the inner side for aesthetic purposes.
Solution Approach 2:
The R-chamfered portion acts as an intermediary element between the attaching member and the flange portion. It provides a transition surface that facilitates smooth insertion and prevents the attaching member from being caught by the flange portion, thereby enabling the lid member to be positioned at the inner side without compromising attaching workability.
3Shape
If the outer peripheral edge portion of the lid member is positioned at the R-end point of the R-chamfered portion to minimize the gap, then the appearance design is improved, but the attaching member insertion may be hindered
Solution Approach 1:
The flat portion of the flange portion extends in the front-rear direction beyond the R-chamfered portion, creating an additional dimensional space. This allows the lid member to be positioned with its outer peripheral edge at the R-end point for aesthetic purposes, while the extending flat portion provides sufficient space for the attaching member to be inserted smoothly without being hindered by the lid member position.
Data Source
AI summary
A vehicle seat including: a cover member including: a front plate portion covering an opening edge portion of a front opening of a through hole; and a tubular side plate portion extending rearward from an inner end portion of the front opening of the front plate portion and covering at least a part of an outer peripheral wall portion of the through hole; and a lid member, wherein the cover member includes an R-chamfered portion configured to guide an attaching member into the through hole, the R-chamfered portion being formed between the front plate portion and the side plate portion, and wherein an outer peripheral edge portion of the lid member abuts on the side plate portion of the cover member at an R-end point of the R-chamfered portion or at a position rear than the R-end point, so that the lid member is attached to the cover member.