Stick Cosmetic Container Rotational Angle Control Mechanism

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Solution Overview

Problem

Conventional stick-type cosmetic containers face issues with poor convenience of use due to unpredictable rotation of the rotating body, which can lead to cosmetics appearing or disappearing from the protection tube, and require strong force to rotate, making it difficult for women with weak hands to use and causing wear that affects the rotation limit function over time.

Innovation Solution

A stick-type cosmetic container with a first rotational angle adjusting part at the lower part of the main body and a second rotational angle adjusting member inside the rotating body that is elastically movable up and down, allowing the two to engage at a predetermined angle, featuring a first and second curved insertion and protrusion portions for smooth rotation, supported by an elastic member to maintain consistent rotational control and reduce wear.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the rotating body is rotated freely without angle control, then the operation is simple, but the rotational angle becomes unpredictable causing poor convenience of use

Engineering Contradiction:

Improveconvenience of useVSAvoidrotational angle control

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The snap ring acts as an intermediary component between the rotating body and the main body, providing angular position control through its protrusion inlet that guides the snap protrusion. This mediator enables precise rotational angle control without complicating the overall rotation mechanism.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces complex mechanical angle control systems with a simpler snap-fit mechanism using the snap ring and snap protrusion. This substitution maintains rotational angle precision while simplifying the mechanical structure and ease of operation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Manufacturing precision

If a snap ring structure is used to limit rotation, then the rotational angle is controlled, but strong force is required to rotate which is difficult for women with weak hands

Engineering Contradiction:

Improverotational angle controlVSAvoidrotation force

Core Design Contradiction:

Manufacturing precisionVSForce

Solution Approach 1:

The snap protrusion is designed with a curved surface that corresponds to the curved inner circumferential surface of the snap ring. This curvature allows the snap protrusion to be forcibly passed through the snap ring with reduced friction and required force, making rotation easier for users with weak hands while maintaining angular control.

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The patent modifies the geometric parameters of the snap protrusion and snap ring contact surfaces, specifically introducing curved surfaces with optimized radii. This parameter change reduces the force required for rotation while preserving the angular positioning function.

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If the snap protrusion is forcibly passed through the snap ring, then the rotation is achieved, but wear occurs affecting the rotation limit function over time

Engineering Contradiction:

Improverotation capabilityVSAvoidrotation limit function

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The curved surface design of the snap protrusion and corresponding inner circumferential surface of the snap ring serves as beforehand cushioning. This design distributes the wear over a larger surface area and reduces peak stresses, thereby extending the service life of the rotation limit function while maintaining rotation capability.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The patent introduces dynamic elements to the snap mechanism, allowing the snap protrusion to elastically deform and adapt during the forcing through process. This dynamic behavior reduces impact loads and wear on the contact surfaces, improving long-term reliability.

Inventive Principle:

Principle #15Dynamics

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 container ensures consistent and easy control of the rotational angle, improving usability by allowing smooth and soft rotation, reducing wear, and maintaining functionality even after extended use.

Implementation Method 1

a second rotational angle adjusting member formed inside the rotating body so as to be elastically movable up and down

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS11523673B2Stick-type cosmetic container for controlling rotational angle of rotating body at predetermined angle

Publication Date: 2022.12.13 PUMTECH KOREA

AI summary

A stick-type cosmetic container for controlling the rotational angle of a rotating body at a predetermined angle, which allows stick cosmetics to be withdrawn from or inserted in a main body by the rotation of the rotating body, has a first rotational angle adjusting part formed at the lower part of the main body, and a second rotational angle adjusting member formed inside the rotating body so as to be elastically movable up and down, such that the first rotational angle adjusting part and the second rotational angle adjusting member engage with each other.