Interdental Brush Wire Detachment Prevention
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Solution Overview
Problem
Existing interdental brushes produced by insert resin molding are expensive due to complex and costly molding equipment, requiring time and labor to set up, making them costly and troublesome to produce.
Innovation Solution
An interdental brush design and production method using simple resin molding, where a twisted wire with bristles is secured by a handle formed through primary and secondary injection molding, with a wire detachment preventing portion curved in an S-shape to prevent the wire from coming off, reducing the likelihood of detachment and production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insert resin molding is used to attach the wire to the handle, then the wire is securely attached and less likely to come off, but the equipment cost increases and the production process becomes more complex and time-consuming
Solution Approach 1:
The wire attachment preventing portion is integrated directly into the handle body as a single molded component, eliminating the need for separate insert resin molding processes. The handle and wire attachment feature are combined into one injection molding operation, simplifying the overall manufacturing process while maintaining secure wire attachment.
Solution Approach 2:
The handle is divided into a main body portion and a separate wire attachment preventing portion that can be formed in different stages. The wire attachment preventing portion is formed after the main body is molded, allowing for simplified manufacturing while achieving the same functional result as complex insert resin molding.
2Reliability
If insert resin molding is used to attach the wire to the handle, then the wire is securely attached, but the production time and labor increase making it troublesome
Solution Approach 1:
The wire attachment preventing portion is prepared in advance as a separate molded component before final assembly. This preliminary formation of the attachment feature allows for more efficient final assembly and reduces overall production time compared to complex insert resin molding processes that require precise timing and setup.
Solution Approach 2:
By combining the wire attachment preventing portion with the handle body as integrally formed components, the number of separate molding operations is reduced. This merging eliminates the need for complex insert resin molding setups and reduces production time while maintaining secure wire attachment.
3Reliability
If insert resin molding is used, then the wire attachment is secure, but the equipment cost increases making the interdental brush expensive
Solution Approach 1:
The invention uses simple, easily formed plastic components for the wire attachment preventing portion rather than expensive, complex insert resin molding equipment. The attachment feature is formed using standard injection molding techniques with simple dies, significantly reducing equipment investment and manufacturing cost while maintaining adequate wire attachment reliability.
Solution Approach 2:
The handle is segmented into a main body and a wire attachment preventing portion that can be formed using simpler, less expensive molding processes. This segmentation allows the use of standard, affordable injection molding equipment rather than requiring complex insert resin molding machinery, reducing manufacturing costs while achieving secure wire attachment.
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 method allows for the production of an inexpensive interdental brush with a reduced likelihood of wire detachment from the handle, achieved through a cost-effective and simplified manufacturing process using injection molding techniques.
Implementation Method 1
a handle (20) made of a thermoplastic synthetic resin, wherein a wire detachment preventing portion (50) which is curved in a generally S-shaped shape together with the twisted wire with bristles (10) is formed in the main body (21)
Data Source
Figure 1
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AI summary
An interdental brush of the present invention includes bristles (11), a wire (12) twisted with the bristles (11), and a handle (20) attached to the wire (12). The handle (20) includes a main body (21). The main body (21) is formed with a longitudinal hole (41) through which a base part of the wire (12) extends, a space section (42) connecting to the longitudinal hole (41), and extending through the main body (21) in a lateral direction, and a tubular wire detachment preventing portion (50) extending from a peripheral portion of an opening of the longitudinal hole (41) at an inner wall surface of the space section (42) into the space section (42). The wire detachment preventing portion (50) is curved together with the wire (12) with a tip portion of the base part of the wire (12) being inserted therein.