Airtight Container Handle Assembly Without Shrink-Fit Damage
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Solution Overview
Problem
Conventional airtight container handle assemblies that use shrink-fits can damage the cover or handle due to tight tolerances, and loose tolerances lead to separation issues during assembly and use.
Innovation Solution
A handle assembly for airtight containers that employs a design with protruding hooks on the main body and corresponding insertion projections on the cover, utilizing a pair of side members with insertion holes and coupling grooves, a central member with fixed parts, and a separation preventing mechanism to prevent damage and separation, such as thermal or ultrasonic bonding, through-holes, and hooking pieces, allowing for secure assembly without shrink-fits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If shrink-fit is used to assemble locking handle to cover, then coupling strength is improved, but damage to cover or handle occurs due to tight tolerances
Solution Approach 1:
The locking handle is divided into multiple components: the handle body (401), coupling protrusion (402), and separate coupling hole (41) in the cover. This segmentation allows the coupling protrusion to engage with the coupling hole without requiring tight shrink-fit tolerances, eliminating damage while maintaining coupling strength through the hooked structure
Solution Approach 2:
Instead of forcing the handle onto the cover using shrink-fit (tight tolerance approach), the design inverts the approach by using a hooked coupling protrusion that engages with the coupling hole from the outside, allowing assembly with larger tolerances while maintaining secure coupling
2Ease of manufacture
If large tolerance is used between coupling hole and coupling protrusion, then assembly is facilitated, but locking handle may separate from cover during use
Solution Approach 1:
The coupling protrusion (402) is designed as a hooked structure that engages with the coupling hole (41) in reverse orientation compared to conventional shrink-fit designs. This inverted hooked structure prevents separation while allowing large tolerances, achieving both easy assembly and reliable coupling
Solution Approach 2:
The coupling protrusion features a curved hooked structure that provides mechanical interlocking with the coupling hole. This curved geometry ensures that even with large tolerances, the hooked shape prevents separation during use while facilitating easy assembly
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 handle assembly can be securely coupled to the cover without damaging the handle or cover, ensuring reliable assembly and use by preventing separation and damage through the use of sliding and bonded components.
Implementation Method 1
the fixed parts and coupling grooves are bonded to each other by thermal bonding or ultrasonic bonding
Implementation Method 2
the fixed parts and coupling grooves are bonded to each other by thermal bonding or ultrasonic bonding
Data Source
AI summary
The present invention relates to a handle assembly for an airtight container. The handle assembly, intended for an airtight container including a main body on which a plurality of hooks protruding outwardly are disposed on a circumference of the upper end thereof, and a cover on which a plurality of protruding hooks having insertion projections on either end thereof are disposed on the circumference thereof, the cover protruding outwardly so as to correspond to the hooks and opening or closing an upper side of the main body, includes: a pair of side members, each having an insertion hole in which each of the insertion projections of the cover is inserted, and a coupling groove having a predetermined size and being positioned spaced apart from the insertion hole; a central member including fixed parts on either end thereof such that the central member is inserted and fixed to the coupling grooves between the pair of the coupling grooves between the pair of side members; and a separation prevention unit preventing the fixed parts from being separated from the coupling grooves.