Fiber-Reinforced Handle Construction for Balanced Replaceable Heads
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Solution Overview
Problem
Existing personal care implements, such as manual toothbrushes, suffer from lightweight handles made of common plastics that lack comfort, maneuverability, and ergonomic design, leading to poor handling and quality perception, and frequent replacement results in excessive waste.
Innovation Solution
A handle manufacturing method involving a core-connector unit made from fiber-reinforced material, combined with a polymeric component, providing enhanced stiffness, weight, and durability, and a snap-fit mechanism for secure attachment of replaceable heads, ensuring long-lasting use and reduced waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the handle is made of common plastic materials like polypropylene, then the manufacturing cost is low and ease of manufacture is high, but the handle weight is insufficient leading to poor comfort and maneuverability
Solution Approach 1:
The handle is constructed as a multi-component assembly combining a lightweight core structure made of common plastic materials with dense weight elements (such as metal inserts or high-density polymer inserts) strategically positioned within the handle. This composite approach allows the handle to achieve sufficient weight for comfort and maneuverability while maintaining ease of manufacture through modular assembly of standard materials.
2Weight of moving object
If the cross-sectional area of the handle is increased to improve comfort, then the handle weight increases improving comfort, but the ease of rotating the brush in the hand is reduced
Solution Approach 1:
The handle employs local quality by concentrating dense weight elements specifically in the distal portion of the handle (away from the grip area) or in strategic locations that improve balance without increasing the cross-sectional area of the grip zone. This allows the handle to achieve proper weight distribution for comfort while maintaining a slender, easily rotatable profile in the user's hand.
3Loss of substance
If the handle is made with less material to reduce waste, then the environmental impact is reduced, but the comfort and quality perception during use deteriorates
Solution Approach 1:
The handle uses composite materials combining lightweight plastics with strategic inserts of high-density materials (metal or high-density polymer) to achieve sufficient weight and quality perception. This allows the overall material usage to remain low (reducing waste) while the strategic placement of dense materials provides the necessary comfort and premium feel during use.
Solution Approach 2:
The handle applies local quality by concentrating material only where necessary for comfort and functionality. The majority of the handle structure uses minimal material, but strategic locations incorporate dense weight elements or textured grip zones that provide comfort and quality perception without requiring increased overall material consumption.
4Loss of substance
If a replaceable head mechanism is implemented, then waste is reduced by reusing handles, but the handling properties and center of gravity are compromised
Solution Approach 1:
The handle implements composite materials with integrated weight elements that compensate for the weight changes when heads are attached or removed. The dense inserts are strategically positioned to maintain a consistent center of gravity whether the head is attached or the handle is used alone, ensuring stable handling properties throughout the product lifecycle and supporting the replaceable head mechanism without compromising ergonomics.
Data Source
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AI summary
A method for manufacturing a handle for a personal care implement comprises the following steps: - molding, preferably injection-molding, a core-connector unit from a fibre reinforced material, the core-connector unit comprising a core structure and a connector for attaching and detaching a head to and from the handle, - molding, preferably injection-molding, a polymeric material onto the core structure to form a second component, the second component at last partially covering the core structure.