Rotatable Document Box Hold Open Mechanism
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Solution Overview
Problem
Document boxes with removable top portions often suffer from misplacement or loss, and lack a positive stop to maintain the top portion in an open position during use or movement.
Innovation Solution
A document box design featuring a rotatable top and bottom portion with a raised member and contact rib system, allowing the top portion to be held open and providing a rotational positive stop, enabling continuous access to stored items.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the top portion is made removable for easy access, then ease of operation is improved, but reliability deteriorates due to misplacement or loss
Solution Approach 1:
The lid is segmented into a main body and a separate retention mechanism (latch or snap-fit feature) that can be independently engaged or disengaged. This allows the lid to be easily removed when needed while providing reliable retention when closed, resolving the contradiction between ease of access and retention reliability.
2Reliability
If the top portion is connected to prevent misplacement, then reliability is improved, but ease of operation deteriorates due to lack of positive stop
Solution Approach 1:
The connection mechanism is designed to be dynamic rather than static - it automatically engages and disengages based on the lid's position. The spring-loaded latch or snap-fit feature provides a positive stop when the lid is closed while allowing easy opening, resolving the contradiction between retention reliability and operational ease.
3Ease of operation
If a hold open feature is added to maintain open position, then ease of operation is improved for continuous access, but device complexity increases
Solution Approach 1:
The hold open feature is designed to be self-actuating through the user's natural opening motion. The spring-loaded mechanism automatically engages the hold open position when the lid is pulled open, requiring no additional actuators or complex control systems. This provides continuous access capability while minimizing the increase in device complexity.
Data Source
AI summary
A document box includes a top container portion and a bottom container portion. The top container portion has a rear wall with a hollow rib integrally disposed thereon. The bottom container portion is rotatably coupled to the top container portion about an axis of rotation, and the top container portion is positionable between a closed position and an open position on the bottom container portion. The bottom container portion having a rear wall and a bottom wall. A raised member is positioned on the bottom wall adjacent to the rear wall. The top container portion where rotated to the open position releasably positions the raised member within the hollow recessed rib, thereby defining a hold open feature for the top container portion.