Composite Safety Toothbrush Head Design
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Solution Overview
Problem
Conventional toothbrushes are not suitable for prison and institutional settings due to their potential to be fashioned into weapons, and existing safety toothbrushes are either too short or have poor bristle retention, leading to ineffective cleaning and discomfort.
Innovation Solution
A composite toothbrush design featuring a rigid inner head and a pliable outer head, with pin connectors and a flexible handle made from thermoplastic material, eliminating the need for adhesives and ensuring bristle retention, while allowing for safe use and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional rigid toothbrush is used, then effective cleaning is achieved, but it can be fashioned into a weapon
Solution Approach 1:
The toothbrush head is constructed as a composite structure with an inner rigid head made from hard material (acrylic or nylon) and an outer soft head made from pliable material (thermoplastic rubber or polypropylene). This composite design allows the rigid inner head to provide structural support and bristle retention for effective cleaning, while the soft outer head prevents the toothbrush from being fashioned into a weapon by eliminating sharp edges and points.
2Object-affected harmful factors
If a very short handle is used to prevent weaponization, then safety is improved, but the toothbrush becomes awkward to use
Solution Approach 1:
The handle is designed with a flexible parameter - it can be bent to approximately 90 degrees from its straight position. This flexibility allows the handle to be stored in a compact form when not in use, reducing its potential as a weapon, while during use it can be extended to a comfortable length for effective brushing. The flexible material (thermoplastic rubber or polypropylene) enables this parameter change without compromising structural integrity.
3Object-affected harmful factors
If flexible material is used in the toothbrush head, then weaponization is prevented, but bristle retention becomes poor
Solution Approach 1:
The toothbrush head is segmented into two distinct functional zones: an inner rigid head that provides structural support and secure bristle retention through its hard material construction, and an outer soft head that prevents weaponization. The segmentation allows each material to perform its specialized function - the rigid inner head maintains bristle security while the soft outer head eliminates sharp edges, solving both requirements simultaneously.
Data Source
AI summary
A composite safety toothbrush is disclosed, and in particular, methods for making and forming the composite. The toothbrush apparatus detailed herein employs a composite head made from a rigid inner polymer material and a softer thermoplastic material surrounding the inner material. The softer material provides safety for prison toothbrush applications as well as elderly and patient care where care givers may brush the teeth of a patient. Innovative pin connectors in the inner toothbrush head assist in the composite formation. The toothbrush solution herein further importantly provides for a toothbrush having a flexible handle, also providing safety in a prison environment.