Fastener With Undercut Portions For Tape Attachment
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Solution Overview
Problem
Existing fasteners for attaching cabling members to object members, such as vehicle body panels, face issues with excessive relative longitudinal displacement due to large displacement forces, requiring strong adhesive tape wrapping to prevent disengagement.
Innovation Solution
A fastener design featuring a plate-shaped connecting base with projecting portions and undercut portions, where the adhesive tapes completely cover the projecting portions, allowing the fastener to slide and be caught by the undercut portions when a large lateral displacement force is applied, effectively minimizing relative displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive tapes are wrapped with large wrapping force to prevent disengagement, then reliability of attachment is improved, but device complexity and ease of operation deteriorate
Solution Approach 1:
The undercut portions are pre-formed in the connecting base at predetermined positions. These structural features are prepared in advance during manufacturing, so that when adhesive tapes are wrapped around the connecting base, they automatically engage with the undercut portions to prevent disengagement. This preliminary structural preparation eliminates the need for excessive wrapping force during installation.
Solution Approach 2:
The undercut portions automatically engage with the adhesive tapes when the tapes are wrapped around the connecting base. This self-engaging mechanism provides inherent anti-disengagement functionality without requiring additional components or complex wrapping procedures. The structure itself serves the function of preventing tape disengagement.
2Reliability
If tape stopper ribs are provided to prevent longitudinal displacement, then reliability is improved, but device complexity increases due to need for precise positioning
Solution Approach 1:
The connecting base is segmented with multiple undercut portions distributed at different positions and orientations. These segmented features work independently to resist displacement forces from various directions. The undercut portions are formed as separate functional elements within the connecting base structure, allowing them to be optimally positioned without complex interconnections.
3Reliability
If adhesive tapes are wrapped tightly to prevent excessive displacement, then reliability is improved, but ease of operation worsens due to difficulty in wrapping
Solution Approach 1:
The undercut portions act as intermediary structures between the adhesive tapes and the connecting base. They provide intermediate engagement points that mechanically lock the tapes in place. This intermediary mechanism translates simple tape wrapping into secure attachment, eliminating the need for excessive wrapping force while maintaining reliability.
Data Source
AI summary
A fastener may include a plate-shaped connecting base, at least one pair of projecting portions respectively formed in the connecting base, and undercut portions formed in the at least one pair of projecting portions. The at least one pair of projecting portions oppositely project in a lateral direction of the connecting base. The at least one pair of projecting portions respectively have first surfaces sloped toward distal ends thereof. The undercut portions are defined by the first surfaces of the at least one pair of projecting portions.