Oral Cleansing Device Chassis Radial Compression
Solution Overview
Problem
Current oral cleansing devices face issues with high localized stresses and non-uniform clamping forces due to traditional fastening methods, which limit handle design options and require larger housing dimensions.
Innovation Solution
A chassis design featuring a first and second chassis half with threaded portions and a nut that secures the halves together, creating a radial compressive force through a taper lock mechanism to address the issues of stress and clamping force distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional fasteners (screws, nuts and bolts) are used to secure chassis halves, then the chassis can be assembled, but high localized stresses are created at the attachment regions
Solution Approach 1:
The continuous threaded structure is segmented into a first threaded portion in the first chassis half and a second threaded portion in the second chassis half. This segmentation allows the nut to engage both chassis halves simultaneously, distributing the clamping force across multiple attachment points rather than concentrating it at discrete locations, thereby reducing localized stresses while maintaining attachment strength.
Solution Approach 2:
The patent merges the threading function into both chassis halves by incorporating threaded portions in each half. This merging creates a distributed fastening system where the nut engages both halves simultaneously, combining the fastening function across the entire attachment region rather than relying on discrete fastener points, thus reducing localized stress concentration.
2Strength
If traditional discrete fasteners are used, then chassis can be secured, but non-uniform and/or insufficient clamping forces are created within the chassis
Solution Approach 1:
The patent applies local quality by creating different structural characteristics in different parts of the chassis halves. The threaded portions are strategically positioned and dimensioned to create optimal stress distribution zones. The continuous threaded structure allows the nut to apply clamping force uniformly across multiple engagement points, ensuring consistent local quality throughout the attachment region rather than having variable clamping forces at discrete fastener locations.
Solution Approach 2:
The continuous threaded structure creates an equipotential fastening system where the nut engages both chassis halves at the same axial position, ensuring uniform clamping force distribution. This eliminates the non-uniform clamping forces that occur with discrete fasteners at different locations, creating a balanced stress state across the entire attachment region.
3Ease of manufacture
If larger housing dimensions are used to accommodate attachment elements, then traditional fastening methods can be implemented, but the number of possible handle designs is limited
Solution Approach 1:
The threaded portions are nested within the chassis halves themselves, with the first threaded portion formed in the first chassis half and the second threaded portion formed in the second chassis half. This nesting eliminates the need for external attachment elements protruding from the chassis, allowing for more compact and versatile handle designs while maintaining ease of manufacture through integrated threading.
Solution Approach 2:
The patent transitions from discrete point-based fastening to a continuous distributed fastening system along the axial dimension. The continuous threaded structure allows the nut to engage both chassis halves simultaneously along its length, distributing the attachment function across a dimension rather than at discrete points, thereby reducing the space required for attachment elements and enabling more design options.
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
This design enhances the attachment of chassis pieces, reducing localized stresses and providing a more uniform clamping force, allowing for a wider range of handle designs without the need for larger housing dimensions.
Implementation Method 1
creating a radial compressive force through a taper lock mechanism to address the issues of stress and clamping force distribution
Data Source
AI summary
A chassis of an oral cleansing device is provided. The oral cleansing device may include a first chassis half including a first threaded portion, a second chassis half including a second threaded portion, and a nut threaded onto the first threaded portion and the second threaded portion to at least partially secure the first chassis half to the second chassis half. The threaded portions may be defined on respective ends of the first chassis half and the second chassis half. The nut may engage chamfered edges of the first chassis half and the second chassis half. Engagement of the nut with the first chamfered edge and the second chamfered edge may produce a radial compressive force on the chassis halves. The first chassis half and the second chassis half may at least partially define a chassis that is positioned within a handle of the oral cleansing device.