Vanity Case Lid Opening Speed Control Mechanism
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Solution Overview
Problem
Existing vanity case mechanisms for controlling the opening speed of a pivotably mounted lid are complex, requiring intricate shapes and assembly processes, leading to increased production costs and difficulty in ensuring proper viscous material charging and quality control.
Innovation Solution
A vanity case design featuring a torsion spring for urging the lid open, combined with a friction member and braking protrusion system to adjust the rotational speed, which simplifies member shapes and assembly while allowing for precise control of the opening speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If viscous material is charged between the shaft and shaft holding portion to control lid opening speed, then the opening speed control is achieved, but the shapes of members become complicated and assembly effort increases
Solution Approach 1:
The invention extracts the viscous material charging operation from the assembly process by designing the shaft with a through-hole that allows the viscous material to be injected from the outside after assembly, eliminating the need for pre-charging the material between tight-fitting parts
Solution Approach 2:
The invention introduces a seal member as an intermediary component that enables the viscous material to be charged through the through-hole while preventing leakage, simplifying the overall structure by allowing post-assembly filling rather than requiring precise pre-assembly gaps
2Speed
If viscous material is charged between the shaft and shaft holding portion to control lid opening speed, then the opening speed control is achieved, but assembly effort and production cost increase
Solution Approach 1:
The invention performs the viscous material charging operation after the main assembly is complete, using the through-hole in the shaft to inject the material, thereby avoiding the need for separate pre-assembly steps and quality checks for material charging
Solution Approach 2:
The shaft's through-hole structure serves dual purposes: it allows for easy post-assembly filling of viscous material and also acts as the charging channel, eliminating the need for separate filling operations and reducing assembly complexity
3Speed
If viscous material is charged between the shaft and shaft holding portion to control lid opening speed, then the opening speed control is achieved, but quality control becomes difficult
Solution Approach 1:
The invention replaces the mechanical challenge of verifying viscous material charging with a simple visual inspection method, where the operator can directly observe whether the through-hole is filled with the viscous material, making quality control straightforward and reliable
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 stable and slow automatic opening mechanism, reducing production costs and complexity while ensuring high-quality assembly and adjustable opening speed control.
Implementation Method 1
a torsion spring is provided at the first hinge piece side for urging the lid so as to rotate in an opening direction by engaging the torsion spring with the case body and the lid
Implementation Method 2
a friction member is provided in the concave portion to brake the rotational speed of the lid due to the torsion spring by holding the friction member under pressure between the concave portion and the convex portion
Implementation Method 3
a protrusion is provided on one of an outer circumference of the convex portion and an inner circumference of the concave portion for braking the rotational speed of the lid by sliding contact with the other one of outer circumference of the convex portion and the inner circumference of the concave portion
Data Source
AI summary
A vanity case is provided in which a first hinge piece and a second hinge piece are formed in one of the case body and the lid, and a hinge block is formed in the other one of the case body and the lid and arranged between the first and the second hinge pieces. A friction member is provided to brake the rotational speed of the lid caused by a torsion spring. A protrusion is provided for braking the rotational speed of the lid by sliding contact. A recessed circumferential portion is formed in the vanity case so as to release the sliding contact of the braking protrusion at least at the closed position of the lid.