Rod Cosmetic Cap Assembly via Temporary Inner Cylinder Retraction
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Solution Overview
Problem
Existing rod-shaped cosmetic containers face issues with cap assembly workability due to radially inward bending deformation obstruction by the inner cylinder during force fitting of the latching portion into the second cap portion, leading to poor fitment and increased complexity in assembly.
Innovation Solution
The design incorporates a tubular first cap portion with a vertically slanted guide groove and a second cap portion that rotates relative to the first, featuring a temporary holding portion and return portion to allow the inner cylinder to sink downward against a return spring, enabling radially inward bending deformation of the first cap portion for smooth force fitting, thus facilitating cap assembly without obstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the inner cylinder is positioned at the upper end of the first cap portion during assembly, then the cap structure maintains its initial posture, but the radially inward bending deformation of the upper end portion is obstructed, making force fitting difficult
Solution Approach 1:
The patent applies preliminary action by temporarily moving the inner cylinder downward before the force fitting operation. The temporary holding portion receives the inner cylinder at a lower position, allowing the upper end portion of the first cap portion to bend radially inward without obstruction. After the force fitting of the latching portion is completed, the inner cylinder is returned to its initial upper position. This preliminary repositioning enables the force fitting to proceed smoothly.
Solution Approach 2:
The patent applies dynamics by making the inner cylinder's position changeable during the assembly process. Instead of being fixed at the upper end, the inner cylinder can be temporarily held at a lower position by the temporary holding portion. This dynamic repositioning allows the upper end portion to deform radially inward during force fitting, and then the inner cylinder is returned to its original position after assembly, providing flexibility in the assembly process.
2Reliability
If the latching portion is force fitted into the second cap portion, then a secure connection is achieved, but the radially inward bending deformation is obstructed by the inner cylinder, leading to poor fitment and increased assembly difficulty
Solution Approach 1:
The patent applies preliminary action by temporarily repositioning the inner cylinder to the lower temporary holding portion before performing the force fitting operation. This preliminary action creates the necessary space for the upper end portion to bend radially inward, enabling the latching portion to be force fitted smoothly into the second cap portion. After force fitting is complete, the inner cylinder is returned to its initial position, ensuring both reliable connection and ease of manufacture.
3Stability of the object's composition
If the inner cylinder is held in a fixed position during assembly, then structural stability is maintained, but the temporary downward movement needed for smooth force fitting cannot be achieved
Solution Approach 1:
The patent applies dynamics by making the inner cylinder's position adjustable during assembly. The temporary holding portion allows the inner cylinder to be temporarily held at a lower position, enabling smooth force fitting and radially inward bending deformation. After assembly is complete, the inner cylinder is returned to its initial upper position, restoring structural stability. This dynamic repositioning resolves the contradiction between stability and assembly smoothness.
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 allows for easy and reliable cap assembly by temporarily holding the inner cylinder lower than the cap's upper end, enabling smooth force fitting of the second cap portion and ensuring proper latching without obstruction, enhancing workability and simplifying the assembly process.
Implementation Method 1
a return spring for returning the second cap portion to a pre-relative rotation position and returning the inner cylinder to an initial position before downward movement
Implementation Method 2
the guide protrusion being guided by the guide hole and the slanted guide groove
Data Source
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AI summary
The present invention addresses the problem of making assembling work of a rod-shaped cosmetic container easy and reliable. The solution is configuring a cap (3) of the rod-shaped cosmetic container (1) with a first cap portion (11), an inner cylinder that is internally fitted to an upper part of the first cap portion, a return spring (20) that biases the inner cylinder upward, and a second cap portion (12) that is externally fitted rotatably relative to the first cap portion, and forming in the first cap portion a temporary holding hole (22) in which a guide protrusion (13a) formed on the inner cylinder is temporarily held against the biasing force of the return spring, for having an upper end portion of the inner cylinder located lower than an upper end portion of the first cap portion in a state where the guide protrusion is temporarily held in the temporary holding hole, so that the upper end portion of the first cap portion is deformed to bend radially inward without being obstructed by the inner cylinder when the second cap portion is externally fitted to the first cap portion.