Polyacetal Pressing Portion for Bracelet Length Adjustment
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Solution Overview
Problem
Existing bracelets with metal components experience wear and deterioration in slidability and appearance due to friction during length adjustment, necessitating a solution for improved durability and aesthetic appeal.
Innovation Solution
The bracelet design incorporates a pressing portion made of resin, specifically polyacetal resin, which reduces friction and wear by sliding against the cover member, along with a pair of rail portions and an elastic member for length adjustment, ensuring high durability and aesthetic excellence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal members are used for the pressing portion and cover member, then strength and structural integrity are improved, but wear and deterioration in slidability occur due to friction during length adjustment
Solution Approach 1:
The pressing portion is made of resin (polyacetal resin) while the cover member remains metal, creating a composite material solution. The resin pressing portion reduces friction and wear against the metal cover member inner surface, while the metal cover member maintains structural integrity. This composite approach resolves the contradiction by combining materials with complementary properties.
Solution Approach 2:
The material parameter of the pressing portion is changed from metal to resin, fundamentally altering the friction characteristics. This parameter change reduces the coefficient of friction between the pressing portion and cover member, thereby improving durability against wear while maintaining the necessary strength through proper material selection.
2Strength
If metal members are rubbed against each other during length adjustment, then structural strength is maintained, but appearance deteriorates due to wear marks and sliding deterioration
Solution Approach 1:
By using resin for the pressing portion that contacts the metal cover member, the material combination is optimized to prevent visible wear marks. The resin material does not leave metallic wear marks on the cover member, preserving the aesthetic appearance while the metal cover member maintains its structural strength.
Solution Approach 2:
Changing the material parameter from metal to resin alters the tribological properties, specifically reducing the tendency to produce visible wear marks and sliding deterioration. This parameter change addresses the appearance deterioration issue while maintaining functional requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The resin-based pressing portion minimizes friction and wear, maintaining the bracelet's appearance and functionality, providing a durable and aesthetically pleasing length adjustment mechanism.
Implementation Method 1
a pressing portion (73) that includes an elastic member (26)
Data Source
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AI summary
A bracelet includes a clasp portion that couples a first bracelet and a second bracelet. The clasp portion includes a cover member and an adjustment portion. The adjustment portion includes a pair of rail portions disposed along inner sides of two side walls of the cover member and including a plurality of grooves, a pressing portion, a coupling portion of which one end is coupled to an end portion of the first bracelet, and an engagement portion that is engageable with the grooves of the rail portions. Grooves of the rail portions is engaged are selectable by pressing the pressing portion toward the cover member and sliding the pressing portion. A portion of the pressing portion or the coupling portion that slides against an inner surface of the cover member, is made of resin, the pressing portion or the coupling portion facing the inner surface of the cover member.