Blow-Molded Tool Chest Assembly Without Fasteners
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Solution Overview
Problem
Existing blow molded carrying cases require fasteners for assembly and lack a mechanism to prevent drawers from sliding during transport, increasing production costs and assembly complexity.
Innovation Solution
A blow molded carrying case design featuring a top frame member that slideably engages with left and right frame members using connector components, eliminating the need for fasteners and incorporating a mechanism to secure drawers in place using hinged doors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If separate parts are fastened together with fastening devices such as screws or adhesives, then the carrying case can be assembled, but the production cost increases and assembly complexity increases
Solution Approach 1:
The connector components are integrally molded with the frame members, merging the connector function into the frame structure itself. This eliminates separate fastening devices and reduces assembly complexity while maintaining structural integrity.
Solution Approach 2:
The connector components are designed to self-align and self-engage through sliding motion. The barbed portion automatically engages with the relief portion without requiring external fastening devices, enabling self-service assembly.
2Ease of manufacture
If a fixed snapping mechanism is used to link frame parts, then fasteners are eliminated, but the mechanism complexity increases
Solution Approach 1:
The complex fixed snapping mechanism is replaced by extracting only the essential connection function. The connector components use a simple barbed portion and relief portion design that provides secure connection without the complexity of traditional snapping mechanisms.
3Adaptability or versatility
If separate drawers are used for storage, then component organization is improved, but the drawers may slide open during transport
Solution Approach 1:
The connector components are positioned to preemptively prevent drawer displacement before transport begins. The sliding connection mechanism with barbed engagement creates preliminary resistance against forces that would cause drawers to slide open during transport.
4Stability of the object's composition
If multiple assembly steps with fasteners are used, then the frame can be assembled, but production time increases
Solution Approach 1:
The connector components are pre-designed with alignment features and engagement geometries that guide the assembly process. The barbed portion and relief portion are configured to automatically align and engage during sliding motion, eliminating the need for multiple adjustment steps and fastener installation steps.
Data Source
AI summary
A blow-molded carrying chest which includes an integrally molded frame with a top frame member slideably engaged with the left and right frame members. The frame includes a base frame member, and right and left frame members integrally molded to the base frame member. A top frame member is slideably engaged with the right and left frame members to secure the top frame member and assemble the carrying chest without requiring any fasteners. Below the top frame member is a plurality of drawers which are locked by hinged doors on the right and left frame members that prevent the plurality of drawers from sliding when the carrying chest is in transport.