Crip and cord
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Solution Overview
Problem
Molded resin portions of cords are difficult to securely engage with clips without compromising ease of insertion, as narrowing the interspace between the clip's arms can lead to easier disengagement.
Innovation Solution
A clip design featuring first and second claws that project towards each other, with additional third and fourth claws projecting into the retaining space, which are narrower in the front-back direction to prevent disengagement while maintaining ease of insertion, and a cord with grooves to accommodate these claws for secure retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the interspace between the pair of arms is narrowed to securely grasp the molded resin portion, then the reliability of engagement is improved, but the ease of insertion of the molded resin portion deteriorates
Solution Approach 1:
The engagement portion is segmented into multiple claws (first claw, second claw, third claw, fourth claw) arranged at different positions and orientations. This segmentation allows each claw to perform a specific function: the first and second claws provide initial engagement, while the third and fourth claws prevent disengagement, thereby resolving the contradiction between secure grasping and easy insertion
Solution Approach 2:
Different regions of the engagement portion have different local qualities - the first and second claws have wider dimensions for easy insertion, while the third and fourth claws have narrower dimensions for preventing disengagement. This local differentiation allows the engagement portion to simultaneously provide easy insertion and secure retention
2Reliability
If the width of the mouth is reduced to prevent disengagement, then the reliability of engagement is improved, but the ease of insertion deteriorates
Solution Approach 1:
The solution moves from controlling disengagement solely through the left-right width of the mouth to utilizing the front-back dimension as well. The third and fourth claws extend in the front-back direction to provide disengagement prevention, while the left-right width remains sufficiently large for easy insertion. This dimensional transition resolves the contradiction
Data Source
AI summary
A clip has an engagement portion including: a first arm with a first claw at the top end side; a second arm with a second claw at the top end side; and a bottom provided at the respective base end sides of the first arm and the second arm. Projections of the first claw and the second claw defines a left-right width of a mouth. A third claw projects into the retaining space at a position closer to the base end of the first arm, and a fourth claw is provided which projects into the retaining space at a position closer to the base end of the second arm. The third claw is narrower than the first claw in their widths along a front-back direction orthogonal to the depth direction of the retaining space extending from the mouth to the bottom and the left-right width direction of the mouth.