Torque Limiter for Cosmetic Applicator Binding
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Solution Overview
Problem
Conventional mascara applicators require manual dexterity and multiple passes to ensure uniform coating of eyelashes, and automated systems can cause eyelashes to become bound or enmeshed with the applicator, leading to inefficiencies and potential discomfort.
Innovation Solution
A cosmetic applicator with a torque limiter that limits the rotational force applied to the eyelashes, incorporating various torque limiting mechanisms such as slip couplings, magnetic couplings, and fluidic or viscous couplings to prevent excessive torque and binding, allowing for controlled application of mascara.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automated rotating brush is used, then application efficiency is improved, but eyelashes may become bound or enmeshed with the applicator
Solution Approach 1:
A torque limiter is introduced as an intermediary component between the power source and the applicator head. This device monitors and controls the torque transmitted to the applicator, automatically disengaging when excessive torque is detected that would cause eyelash binding. The torque limiter acts as a mediator that protects the eyelashes from harmful forces while preserving the benefits of automated rotation.
Solution Approach 2:
The patent replaces purely mechanical coupling between the motor and applicator head with a smart torque-limiting mechanism. This substitution allows the system to detect and respond to binding conditions through torque sensing, automatically disengaging the mechanical connection when harmful forces are detected, thereby preventing eyelash damage while maintaining automated operation.
2Ease of operation
If manual brush manipulation is used, then control over application force is maintained, but multiple passes are required for uniform coating
Solution Approach 1:
The automated rotating brush performs the application work without requiring continuous manual manipulation. The system serves itself by automatically rotating the applicator head at controlled speeds, allowing the mascara to be distributed uniformly across eyelashes in fewer passes. The torque limiter continues to provide protective oversight, creating a self-managing system that combines automation with safety.
3Speed
If rotational speed is increased, then application speed is improved, but risk of eyelash binding increases
Solution Approach 1:
The torque limiter provides continuous feedback on the torque being applied to the applicator head. When the torque exceeds a predetermined threshold indicating potential eyelash binding, the system automatically reduces or stops rotational speed. This feedback mechanism allows the system to operate at high speeds during normal conditions while automatically slowing down when binding conditions are detected, optimizing both speed and safety.
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 torque limiter ensures efficient and controlled application of mascara, reducing the risk of eyelash binding and enhancing user experience by maintaining a predetermined allowable torque, thus facilitating easier and more uniform coating.
Implementation Method 1
a first surface of the at least one protrusion is frictionally connected to a second surface of the at least one protrusion
Implementation Method 2
magnetic couplings
Data Source
AI summary
A cosmetic applicator includes a handle, a drive coupled to the handle, an applicator head coupled to the drive, and a torque limiter coupled to or within at least one of the drive and the applicator head such that the torque applied via the applicator head does not exceed a predetermined allowable torque.