Blow Molded Toolbox With Strengthening Frames
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Solution Overview
Problem
Conventional plastic toolboxes manufactured by blow molding lack sufficient structural strength, leading to deformation and premature wear when carrying heavy handheld tools, resulting in a shortened lifespan.
Innovation Solution
The toolbox features a casing and cover with metal strengthening frames and engaging rings/protrusions, secured by fasteners, which enhance structural integrity and prevent separation of locking elements, while maintaining the lightweight benefits of blow molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the casing and cover are made with internal hollow structures by blow molding, then the overall weight is reduced and ease of transportation is improved, but the structural strength at locking element positions becomes insufficient causing deformation
Solution Approach 1:
The hollow casing and cover are segmented by adding strengthening ribs that divide the hollow space into sections, providing structural support at critical locations while preserving the overall lightweight hollow structure. The locking element positions are specifically reinforced with additional ribs to prevent deformation.
Solution Approach 2:
Instead of making the entire casing and cover solid (which would increase weight uniformly), strengthening ribs are added only at specific locations where locking elements are mounted. This provides localized structural reinforcement exactly where needed, maintaining the lightweight advantage while addressing the strength deficiency at critical points.
2Ease of manufacture
If locking elements are mounted by extending through external and internal surfaces, then the locking mechanism is formed, but the locking elements separate after long time due to insufficient structural strength
Solution Approach 1:
Strengthening ribs are pre-formed as integral parts of the hollow casing and cover during the blow molding process, before the locking elements are mounted. This preliminary structural reinforcement ensures that the locking elements have adequate support from the outset, preventing separation over time while maintaining the ease of mounting through the hollow walls.
3Ease of operation
If multiple locking elements are mounted on hollow structures, then the locking mechanism functions, but the hollow structures deform under the weight of handheld tools
Solution Approach 1:
Strengthening ribs are strategically positioned at the exact locations where locking elements are mounted on the hollow casing and cover. These localized reinforcements provide additional structural support precisely where the locking elements exert force, preventing deformation of the hollow structures while maintaining the locking mechanism's full functionality.
Solution Approach 2:
The strengthening ribs are designed with curved profiles that follow the contours of the hollow casing and cover. This curved design distributes the stress from the locking elements more effectively across the hollow structure, reducing localized deformation while maintaining the aerodynamic and structural integrity of the overall shape.
Data Source
AI summary
A toolbox has a casing and a cover. The casing has a top mounting flange, a first strengthening frame, and at least one engaging ring. The top mounting flange is formed on the casing. The first strengthening frame is mounted around the top mounting flange. The at least one engaging ring is mounted on the casing and has multiple ring fasteners mounted through the engaging ring and the top mounting flange via the first strengthening frame. The cover is connected to the casing and has a bottom mounting flange, a second strengthening frame, at least one engaging protrusion. The bottom mounting flange is formed on the cover. The second strengthening frame is mounted around the bottom mounting flange. The at least one engaging protrusion is mounted on the cover and has multiple protrusion fasteners mounted through the engaging protrusion and the bottom mounting flange via the second strengthening frame.