Interdental Brush Bristle Stem Fixation via Punching and Filler
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Solution Overview
Problem
Conventional methods for making interdental brushes face issues with unstable engagement between the bristle stem and handle due to resilience and bending angle reduction, leading to potential detachment during use.
Innovation Solution
A method involving a punching device to form expanding portions on the bristle stem, which engage firmly within fixing slots, combined with a filler to securely wrap the bristle stem and handle, ensuring a solid and stable structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bristle stem is propelled by rods to form bent portions, then the bristle stem is fixed to the handle, but the bent portions do not clasp any engaging portion and the engagement is unstable
Solution Approach 1:
The bristle stem is divided into multiple bent portions, each engaging with a separate fixing slot. This segmentation allows each bent portion to independently provide engagement, increasing overall reliability while maintaining a relatively simple structure.
Solution Approach 2:
The bent portions of the bristle stem are nested within the fixing slots of the handle, creating a secure engagement. The filler material is then nested around both components, further stabilizing the connection between the bristle stem and handle.
2Shape
If the bristle stem is twisted by wires to form bent portions, then the bristle stem is shaped, but resilience is generated and the bending angle decreases
Solution Approach 1:
The bent portions are formed in advance during the manufacturing process by propelling the bristle stem with rods before assembly. This preliminary shaping ensures the correct bending angle is achieved before the bristle stem is inserted into the handle, preventing resilience from reducing the angle during assembly.
Solution Approach 2:
The physical state of the bristle stem is changed by applying heat or other treatments during the propelling process, making the material more pliable for forming bent portions. This parameter change allows the bent portions to maintain their shape without resilience, ensuring firm engagement.
3Reliability
If the encompassing portion is extruded to fix the bristle stem, then the bristle stem is secured, but the bristle stem sinks in the encompassing portion and is not efficiently deformed
Solution Approach 1:
Instead of extruding the encompassing portion to fix the bristle stem, the invention inverts the approach by propelling the bristle stem itself to form engaging bent portions that fit into fixing slots. This inversion allows efficient deformation of the bristle stem while achieving stable fixation.
Solution Approach 2:
The material parameters of the bristle stem are modified through heat treatment or selection of specific materials that enhance deformability. This allows the bristle stem to be efficiently deformed into bent portions during the propelling process, improving manufacturing precision while maintaining fixation stability.
4Reliability
If the fixing slots are not intercommunicated with the through hole, then the structure is more secure, but the bristle stem cannot be wrapped well and readily departs during use
Solution Approach 1:
The fixing slots serve multiple functions: they provide engagement for the bent portions of the bristle stem, allow communication with the through hole for filler material to pass through, and enable the bristle stem to be wrapped securely. This multi-functionality resolves the contradiction between security and ease of manufacture.
Solution Approach 2:
The filler material acts as an intermediary that passes through the communicating fixing slots and through hole to wrap and secure the bristle stem. This intermediary enables both secure engagement and ease of assembly by providing a simple wrapping action during manufacturing.
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 provides a firm and precise fixation of the bristle stem, enhancing productivity and reducing manufacturing costs while preventing the bristle stem from detaching from the handle during use.
Implementation Method 1
a punching device is provided in the fixing step for punching a bristle stem with a portion that is exposed to every fixing slot so as to form a plurality of expanding portions on the bristle stem
Implementation Method 2
a filler wraps the bristle stem and a handle for further providing a solid combination
Data Source
AI summary
The method for making an interdental brush inserts a bristle stem into a through hole of a handle in a combining step, whereby exposing the stem to each fixing slot on the handle. Thence the stem is further punched by a punching device, allowing a correspondent formation of expanding portions. Hereby, the expanding portions have an outermost diameter larger than an opening of the through hole for the stem to be firmly lodged in the fixing slots in a fixing step. A filler for wrapping the entire handle and the stem offers a solid engagement between the expanding portions and the fixing slots, so that the stem does not depart from the handle while using.