Binder With Key-Shaped Locking Parts For Sheet Filing
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Solution Overview
Problem
Conventional binders for filing tools face issues with securely holding sheets with binding holes, as they either have a complex structure, require metal parts, or suffer from exterior deterioration and strength weaknesses, making attachment and removal of sheets inefficient and environmentally unfriendly.
Innovation Solution
A binder with a flexible locking bar and band-shaped back board featuring key-shaped locking parts and tying parts, which securely hold sheets between the locking bar and front cover, allowing for easy insertion and removal, and is made from synthetic resin to reduce material usage and environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a binding string coated with synthetic resin is used, then the construction is simple and few parts are required, but the sheet cannot be held stably and the load on each hole is large
Solution Approach 1:
The binding structure is segmented into multiple key-shaped locking parts distributed across multiple holes, with each locking part independently engaging with the locking bar. This distributes the load across multiple points while maintaining a simple overall construction without requiring complex assembly mechanisms.
2Reliability
If multiple holes are provided in the binder, then sheets can be held steadily, but the number of parts increases and attachment/removal becomes less easy
Solution Approach 1:
Multiple key-shaped locking parts are merged into a single integrated locking bar that spans across all holes. This allows all locking parts to be engaged or released simultaneously with one operation, maintaining sheet holding stability through multiple engagement points while preserving ease of operation.
3Device complexity
If a folding-type band-shaped component is used, then few parts are required and sheets can be held securely, but exterior deterioration occurs easily and strength weakens
Solution Approach 1:
Instead of using a folding band-shaped component that weakens at fold lines, the invention inverts the approach by using a rigid locking bar with key-shaped locking parts that engage through holes. This eliminates folding sections entirely, preventing exterior deterioration like whitening while maintaining structural strength and secure sheet holding.
4Device complexity
If metal parts are used in the binder, then the structure can be simple, but environmental protection considerations are compromised
Solution Approach 1:
The material parameter is changed from metal to synthetic resin for the locking bar and key-shaped locking parts. This maintains the structural simplicity and functional effectiveness of the binding mechanism while eliminating the environmental harm associated with metal production and disposal, aligning with eco-friendly design principles.
Data Source
AI summary
A binder for filing tools which binds sheets having a plurality of sheet hole parts aligned in the center includes a locking bar which corresponds to a front cover wherein two front cover parts formed from flat boards of which one side of each is respectively connected to a back cover part and integrated. The back cover part includes a plurality of key-shaped locking parts erected on the front surface thereof, the key-shaped locking part is penetrated through the sheet hole parts in the sheet, a plurality of tying parts are provided in the locking bar in positions corresponding to the positions of the key-shaped locking parts, and the sheets are held between the locking bar and front cover by each tying part being locked to the key-shaped locking part.