Cam Notch Coupling Assembly for Personal Care Appliance Head
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing personal care appliances, such as shaving devices, face challenges in securely coupling the head and body components, particularly under external loads, where the head is not supported at its outer periphery, leading to potential damage from mechanical torque and overload.
Innovation Solution
A coupling assembly featuring cam elements and notches with oppositely sloped surfaces, allowing for secure coupling and easy release by rotating the elements about a central axis, with limited contact areas for enhanced stability and tactile feedback, incorporating a snap connection mechanism for robust fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the head structure is not supported at its outer periphery, then the coupling element can be arranged in the central area, but the coupling element must transfer substantial external load and mechanical torque leading to potential release
Solution Approach 1:
The coupling element is divided into multiple functional segments: a shaft-like element for basic coupling, cam elements for load distribution, and a retention mechanism with notches for securing. This segmentation allows each part to handle specific aspects of the load, improving overall reliability while maintaining structural simplicity.
Solution Approach 2:
The solution transitions from a single-axis coupling to a multi-dimensional engagement system. Cam elements project in a direction parallel to the central axis while notches provide radial engagement, creating a three-dimensional coupling geometry that distributes forces across multiple planes and prevents release under torque.
2Force
If the coupling element transfers substantial external load, then the coupling can be secure, but mechanical torque leads to high force on the coupling element causing accidental release
Solution Approach 1:
The cam elements are designed with inclined surfaces that convert radial forces into axial forces during engagement. This dynamic force transformation allows the coupling to securely transmit loads while the cam mechanism naturally accommodates torque through its geometric progression, preventing force concentration that would lead to release.
Solution Approach 2:
The retention mechanism with notches and cam elements converts the potentially harmful torque and high forces into a beneficial self-locking effect. The geometric arrangement ensures that under normal operational loads and torque, the cam elements press more firmly into the notches, transforming stress into secure retention rather than release.
3Device complexity
If the coupling element is arranged in the central area, then the structure is simplified, but the area of outer periphery cannot contribute to transferring external load
Solution Approach 1:
The solution adds the axial dimension to the central coupling element by projecting cam elements parallel to the central axis. This allows the compact central arrangement to engage with notches in a way that creates lever arms and moment arms, enabling the central position to effectively transfer both radial loads and torque without requiring peripheral support structures.
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 coupling assembly provides improved stability and secure fixation of the head to the body, preventing accidental release during normal use while allowing easy disengagement, enhancing the appliance's durability and user experience.
Implementation Method 1
at least one cam element projecting in a direction of a central axis of the coupling assembly and another of the coupling element and the retaining member comprises at least one notch which is configured to receive and accommodate the at least one cam element
Implementation Method 2
the at least one cam element has two oppositely sloped surfaces converging in a direction from a base to a furthest projecting end of the at least one cam element, and the at least one notch has two oppositely sloped surfaces converging in a direction from an open side to a deepest side of the at least one notch
Data Source
AI summary
A coupling assembly is provided which includes a coupling element and a retaining member. One of the coupling element and the retaining member includes at least one cam element and another of the coupling element and the retaining member includes at least one notch. Both the cam element and the notch have two oppositely sloped surfaces. In a coupled position of the coupling assembly, the cam element and the notch only contact each other at two sides through the sloped surfaces at the position of a contact portion at a base of the cam element and an associated contact portion of the notch at an open side of the notch.