Toothbrush Handle Connector With Ball-Snap Head Locking
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Solution Overview
Problem
Existing manual toothbrush designs with exchangeable heads face challenges in providing a cost-effective, easy-to-clean, and durable connection mechanism that is intuitive for users, often resulting in complex geometries that trap debris and require additional manufacturing steps.
Innovation Solution
A handle connection mechanism featuring a spring-loaded ball-snap element with a ball and spring, allowing for a snap-fit locking mechanism that ensures secure attachment and detachment of the brush head, utilizing a connector with a simple geometry that is easy to clean and manufacture, and incorporating a chamfered design for precise fitting and anti-twist protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a coupling anchor with multiple recesses is used to provide strong connection between head and handle, then connection strength is improved, but the outer geometry becomes complex and difficult to clean
Solution Approach 1:
The connection mechanism is divided into two separate components: a coupling anchor with recesses integrated into the head, and a coupling collar with protrusions integrated into the handle. This segmentation allows each component to have a simpler geometry while maintaining strong connection through their interaction.
Solution Approach 2:
The coupling anchor is inserted into the coupling collar, with the anchor's recesses receiving the collar's protrusions. This nested arrangement provides a secure mechanical interlock while keeping the external geometries of both components relatively simple and cleanable.
2Ease of operation
If plastic hooks are used in the connector to engage with apertures, then connection is achieved, but the hooks relax over time requiring active user effort and additional engaging parts in the brush refill
Solution Approach 1:
The spring-loaded ball element automatically engages with the recess in the brush head when the connector is inserted, providing self-locking without requiring user effort. The spring maintains constant pressure to ensure reliable engagement over time without relaxation issues.
Solution Approach 2:
The engaging mechanism is extracted from the brush head and placed entirely in the handle connector. The coupling anchor in the head requires no active engaging parts, simplifying the head design while maintaining connection functionality through the ball-snap mechanism in the handle.
3Reliability
If a complex anchor/engaging mechanism is used to ensure secure connection, then connection reliability is improved, but manufacturing cost and complexity increase
Solution Approach 1:
The coupling anchor is integrated into the brush head as a single piece, and the coupling collar is integrated into the handle as a single piece. This merging of components reduces the total part count and simplifies manufacturing while maintaining reliable connection through their interlocking geometry.
Solution Approach 2:
The complex mechanical engaging mechanism with multiple moving parts is replaced by a simple ball-snap mechanism combined with complementary geometric shapes (recesses and protrusions). This substitution maintains connection reliability while significantly reducing manufacturing complexity and cost.
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 solution provides a robust, cost-efficient, and user-friendly connection that maintains hygiene by preventing debris accumulation, allows for easy head replacement, and ensures stable brushing performance with improved handling and balance, while reducing waste and manufacturing complexity.
Implementation Method 1
A spring-loaded ball-snap element having a ball and a spring is configured to apply a radial force onto the ball. The spring applies a force onto the ball in a direction towards the outer lateral surface of the connector.
Data Source
AI summary
A handle connection mechanism with a handle having a distal end and a proximal end opposite the distal end. The proximal end has a hollow portion. A connector has an outer lateral surface and a recess therein. The recess forms a cavity within the connector. A spring-loaded ball-snap element having a ball and a spring is configured to apply a radial force onto the ball. The spring-loaded ball-snap is positioned within the cavity of the connector. The spring applies a force onto the ball in a direction towards the outer lateral surface of the connector. A head is repeatedly attachable to and detachable from the handle via the connector. A portion of the connector having the spring-loaded ball-snap element therein outwardly extends from the proximal end of the handle and the ball slightly extends beyond the outer lateral surface surrounding the ball.