Rotating Cosmetic Case Mechanical Locking Design
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Solution Overview
Problem
The use of glue for fastening the metal jacket to a synthetic sheath in rotating cosmetic cases poses issues such as handling difficulties, precise application challenges, and interference with the mechanism's functionality, leading to production rate reductions and potential deterioration of the rotating mechanism.
Innovation Solution
A rotating cosmetic case design featuring a metal jacket mechanically fastened to a plastic sheath using a combination of rotational and tensile locking means, where the rotational locking consists of a cut-out on the metal jacket collaborating with a molded projection in the sheath, and the tensile locking involves an inward-facing wall portion of the metal jacket interacting with a housing in the sheath, optimizing the distribution of forces and preventing separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If glue is used to fasten the metal jacket to the synthetic sheath, then the assembly is simplified, but handling becomes difficult and production rate is reduced
Solution Approach 1:
The patent replaces the chemical bonding system (glue) with a mechanical locking system consisting of a cut-out in the metal jacket that engages with a molded projection in the synthetic sheath. This mechanical substitution eliminates the need for glue application processes, removes handling difficulties associated with adhesive materials, and increases production rate by enabling faster assembly without waiting for glue to set.
2Device complexity
If glue is used to fasten the metal jacket to the synthetic sheath, then the assembly is simplified, but precise application becomes challenging and glue beading interferes with mechanism function
Solution Approach 1:
The mechanical locking system replaces the precision-critical glue application process with a tolerance-friendly mechanical engagement. The cut-out and projection design provides inherent alignment and positioning, eliminating the need for precise glue placement and preventing glue beading that would interfere with the rotating mechanism's functionality.
3Ease of repair
If stamping is used to mechanically fasten the metal sheath to the synthetic sheath, then maintenance is improved, but the rotating mechanism deteriorates
Solution Approach 1:
The patent applies local quality by concentrating the mechanical fastening action at specific localized points (the cut-out and projection engagement areas) rather than applying stamping forces across the entire sheath surface. This localized engagement provides sufficient mechanical fastening for maintenance purposes while avoiding the excessive stress and deformation that would deteriorate the rotating mechanism.
Solution Approach 2:
Instead of deforming the metal sheath through stamping to create the fastening (as in conventional approaches), the patent inverts the approach by creating a complementary geometric engagement where the cut-out in the metal jacket receives and locks onto the molded projection in the synthetic sheath. This reverse engineering approach achieves mechanical fastening without the harmful effects of stamping-induced deterioration.
Data Source
AI summary
A rotating cosmetic case including an outer metal jacket (1) fitted and mechanically retained to a sheath of synthetic material, at the same time by at least one rotational lock and at least one tensile lock. A rotational lock may include a cut-out (5) opening outwards at the lower end of the cylindrical wall of the metal jacket (1), this cut-out (5) being mounted in conjunction with a molded projection in the sheath, while the tensile lock may include at least one aperture (7) in the lower part of the cylindrical wall of the metal sheath (1) defining, with the lower end of the sheath (1), a wall portion (8) directed inwards with respect to a housing located in the sheath.