Belt Length Adjuster With Segmented Inner Frames
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Solution Overview
Problem
Conventional belt length adjusters for goggles face issues such as high frictional resistance, cumbersome adjustment, high manufacturing costs, and complex attachment processes due to large contact areas and separate slip prevention members, as well as cumbersome sliding mechanisms and intricate attachment steps.
Innovation Solution
A belt length adjuster with a frame body featuring outwardly protruding inner frames, larger second insertion spaces, a convex arc shape, and a divided support frame with an insertion opening, which reduces frictional resistance, simplifies attachment, and eliminates the need for separate slip prevention members, allowing for easy and instant length adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the belt end directly contacts the support frame in conventional adjusters, then the structure is simple, but the frictional resistance becomes very large making adjustment difficult
Solution Approach 1:
The frame is divided into multiple components: outer frames, connecting frames, support frame, and inner frames. The inner frames are positioned to protrude outwardly more than the support frame, creating distinct insertion spaces that segment the contact areas. This segmentation reduces the contact area between belt ends, thereby reducing frictional resistance and enabling easier adjustment.
2Reliability
If separate exterior members are added for slip prevention, then slip resistance improves, but manufacturing complexity and cost increase
Solution Approach 1:
The slip prevention function is merged into the inner frames themselves. The inner frames are designed with protruding portions that naturally prevent slip without requiring separate exterior members. This integration eliminates additional manufacturing steps and reduces production costs while maintaining reliable slip prevention.
3Ease of operation
If a slide body mechanism is used for adjustment, then adjustment is possible, but the sliding action is cumbersome and not instant
Solution Approach 1:
The adjuster uses a dynamic insertion/removal mechanism instead of a sliding mechanism. The inner frames are positioned to create insertion spaces that allow the belt end to be quickly inserted and locked in place, or removed for adjustment. This dynamic approach enables instant adjustment without the cumbersome sliding action of traditional mechanisms.
4Ease of manufacture
If the support frame is a single piece, then the structure is simple, but the attachment process is cumbersome requiring looping and sewing
Solution Approach 1:
The support frame is segmented into a first divided part and a second divided part with an insertion opening between them. This segmentation allows the belt end to be simply inserted through the opening without requiring looping around the entire frame and sewing. The divided structure maintains structural integrity while dramatically simplifying the attachment process.
Data Source
AI summary
A belt length adjuster includes a frame body with two outer frames and two connecting frames, and a support frame provided between the two outer frames and stretching to and between the two connecting frames. The support frame supports one end part of the belt member to be used with the belt length adjuster. Two inner frames are respectively provided between the support frame and the respective outer frames and stretching to and between the two connecting frames. The support frame and the respective inner frames provide first insertion spaces into which the one end part of the belt member is inserted, while the respective inner frames and the respective outer frames provide second insertion spaces into which the other side of the belt member is inserted. Furthermore the one end part of the belt member is easily attached to the frame body.