Fiber Optic Furcation Unit Adhesive-Free Assembly
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Solution Overview
Problem
Current fiber optic furcation unit designs face challenges with adhesive bonding, including inconsistent adhesive application, moisture sensitivity, and ineffective bonding between materials, leading to high costs and assembly time.
Innovation Solution
The method involves inserting furcation tubes into a furcation block with a tapered passage design, where the inner diameter of the tube's first end is greater than its second end, allowing for flaring without adhesive, which increases the insertion target and maintains color coding, reducing the need for hazardous materials and assembly time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive bonding is used to retain furcation tubes in the furcation block, then the tubes can be secured in position, but the assembly process becomes sensitive to bond length, adhesive selection and process variation, leading to inconsistent results and higher costs
Solution Approach 1:
The patent removes the adhesive bonding step entirely from the assembly process. Instead of using adhesives to retain furcation tubes in the furcation block, the design uses a mechanical interference fit where the tapered outer surface of the furcation tube directly engages with the tapered inner surface of the passage in the furcation block, eliminating the need for adhesives and their associated process complexities
Solution Approach 2:
The patent replaces the chemical bonding mechanism (adhesive) with a mechanical bonding mechanism (tapered interference fit). The friction and normal forces generated by the tapered surfaces pressing together provide the retention force, substituting chemical adhesion with mechanical interlocking
2Productivity
If fast-curing adhesive is used to bond furcation tubes, then assembly time is reduced, but the adhesive may outgas undesirable whitening during curing that affects the cosmetics of the assembly
Solution Approach 1:
The patent eliminates the adhesive material from the system entirely, removing the source of outgassing and whitening problems. The mechanical interference fit requires no curing time and produces no harmful emissions, simultaneously achieving fast assembly and clean appearance
3Manufacturing precision
If tight tolerances are specified for furcation block and furcation tubes to ensure proper fit, then assembly precision is improved, but manufacturing costs increase due to the need for consistent, tight tolerances
Solution Approach 1:
The patent changes the geometric parameters of the furcation tube and passage by incorporating taper angles. This taper design allows for larger tolerance zones compared to straight-walled configurations, as the conical surfaces can accommodate greater dimensional variations while still achieving proper interference fit and alignment
4Reliability
If adhesive is applied to bond furcation tubes, then the tubes are retained in the block, but the process requires consistent adhesive application which is difficult to achieve, leading to rework and increased assembly time
Solution Approach 1:
The tapered interference fit design is self-aligning and self-retaining. As the furcation tube is inserted into the passage, the tapered surfaces automatically guide the tube into the correct position and generate the necessary retention force through friction and normal forces, eliminating the need for operator-dependent adhesive application
Data Source
AI summary
Fiber optic furcation units, methods for assembling fiber optic furcation units, and fiber optic furcation kits for assembling fiber optic furcation units are provided. A method for assembling a fiber optic furcation unit includes inserting a furcation tube into a passage defined in a furcation block such that a first end portion of the furcation tube is disposed within a first end portion of the passage and the furcation tube extends from a second end of the passage. A first end of the passage has a diameter greater than a diameter of the second end of the passage. The method further includes flaring the first end portion of the furcation tube such that an inner diameter of the first end of the furcation tube increases. The method further includes inserting an optical fiber into the furcation tube through the first end of the furcation tube.