Snap-Fit Trolley Case Assembly Without Screw Fasteners
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Solution Overview
Problem
Current trolley cases require complex manufacturing processes and high labor costs due to the use of screws for assembling telescopic handles and casters, leading to low production efficiency.
Innovation Solution
A quick assembling trolley case design that utilizes snap-fitting mechanisms for handle parts, caster assemblies, and telescopic handle mechanisms, eliminating the need for screws and allowing for easy assembly by snap-joining components such as handle fixing seats, caster assemblies, and telescopic handle parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screws are used to mount handle parts, caster assemblies, and telescopic handle to the shell, then the connection strength and reliability are improved, but the manufacturing procedure becomes complex and labor cost increases
Solution Approach 1:
The patent divides the connection system into separate functional elements: the shell with integrated retaining recesses, the handle parts with fixing seats, the caster assemblies with mounting bases, and the telescopic handle with fixing plates. Each component is pre-formed with its specific connection features, allowing modular assembly through snap-fitting without requiring screws or complex fastening procedures.
Solution Approach 2:
The patent merges the connection function directly into the structural components themselves. The retaining recesses in the shell, the fixing seats in the handle parts, the mounting bases in the caster assemblies, and the fixing plates in the telescopic handle are all integrated into the components during manufacturing. This eliminates the need for separate fastening elements like screws, simplifying the assembly process while maintaining reliable connections.
2Reliability
If screws are used to assemble components, then the connection reliability is improved, but the production efficiency decreases and labor cost increases
Solution Approach 1:
The patent applies preliminary action by pre-forming all connection features during the manufacturing of individual components. The retaining recesses, fixing seats, mounting bases, and fixing plates are all created as integral parts of their respective components before assembly. This preliminary preparation eliminates the need for time-consuming screw fastening operations during assembly, significantly improving production efficiency while maintaining reliable connections.
Solution Approach 2:
The patent substitutes the traditional screw-fastening mechanical system with a snap-fit mechanical interlocking system. The connection is achieved through the geometric interlocking of complementary features (retaining recesses with fixing seats, mounting recesses with mounting bases, receiving recesses with fixing plates) rather than threaded fasteners, eliminating the need for screwdrivers and reducing assembly complexity.
3Productivity
If snap-fitting mechanisms are used for assembly, then the assembling efficiency is improved and labor cost is reduced, but the structural complexity of individual components increases
Solution Approach 1:
The patent applies local quality by concentrating the connection features at specific localized areas of each component rather than distributing complexity throughout the entire structure. Each component has its connection features (retaining recesses, fixing seats, mounting bases, fixing plates) located only where needed for assembly, while the rest of the component structure remains simple. This localized approach enables snap-fitting assembly without requiring overall structural complexity.
Data Source
AI summary
A quick assembling trolley case includes a shell provided at predetermined positions with retaining recesses, mounting recesses, and a receiving recess; a plurality of handle parts including a handle and two handle fixing seats snap-fitted into the retaining recesses; four caster assemblies each including a locating upper cover and a mounting base having a swivel caster connected thereto, which are located at an outer and an inner side, respectively, of the mounting recess and snap-joined together; and a telescopic handle mechanism including a telescopic handle having a grip, two movable rods, and two guiding sleeves fitted on around the movable rods and being connected at upper and lower ends to an upper fixing assembly and a lower fixing assembly, which are snap-fitted onto the receiving recess and a lower portion of the shell, respectively. With the above arrangements, the trolley case can be easily and efficiently assembled.