Chalk Box Elastomeric Seal and Reel Mechanism
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Solution Overview
Problem
Conventional chalk boxes lack effective sealing mechanisms to prevent leakage of marker materials and often require complex mechanisms for accessing and refilling, making them inconvenient to use.
Innovation Solution
A chalk box design featuring a housing with a rotatable reel, a movable cover made of elastomeric and rigid materials, and a releasable lock that allows manual operation, providing a secure seal and easy access for refilling and line management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional chalk box uses a simple cover design, then the device complexity is reduced, but the sealing effectiveness deteriorates leading to leakage of marker materials
Solution Approach 1:
The cover is constructed using composite materials - a rigid base material (such as plastic or metal) combined with an elastomeric sealing material. This composite structure provides both the structural integrity needed for a durable cover and the sealing capability to prevent leakage of chalk or marker materials, resolving the contradiction between simple design and effective sealing.
Solution Approach 2:
The elastomeric material forms a flexible sealing layer on the cover that can deform to create an effective seal against the housing opening. This flexible sealing mechanism prevents leakage while maintaining a relatively simple overall cover design, addressing both the sealing effectiveness and device complexity requirements.
2Ease of operation
If a conventional chalk box uses a simple opening design, then the ease of operation is improved, but the containment reliability deteriorates allowing accidental opening
Solution Approach 1:
The releasable lock mechanism is designed to be manually operable by the user without requiring additional tools or complex procedures. The user can easily engage and disengage the lock with simple manual manipulation, providing both secure containment when locked and easy access when unlocked, thus resolving the contradiction between containment reliability and ease of operation.
3Device complexity
If a conventional chalk box lacks a sealing mechanism, then the device complexity is reduced, but the loss of substance increases due to marker material leakage
Solution Approach 1:
The elastomeric sealing material forms a flexible barrier that prevents marker material from leaking through the interface between the cover and housing. This simple yet effective sealing approach stops substance loss without requiring a complex multi-component sealing system, addressing both device complexity and loss of substance concerns.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures secure containment of marker materials, easy refilling, and convenient operation by using an elastomeric cover that seals effectively and can be manually locked and unlocked, enhancing user experience and preventing accidental opening.
Implementation Method 1
The movable cover includes an elastomeric material and a relatively rigid material, the elastomeric material enabling the cover to seal with the housing when the cover is closed to prevent leakage of the marker material
Data Source
AI summary
A chalk box includes a housing with an opening and a rotatable reel disposed within the housing. An elongated line is arranged to be wound on the reel. A reel winder is arranged to rotate the reel to wind the line on the reel. A movable cover is mounted to the housing and is movable between an open position and a closed position, the cover when open permits a powder or a fluid marker material to be placed into the housing through the opening in the housing. The movable cover includes an elastomeric material enabling the cover to seal with the housing when the cover is closed to prevent leakage of the marker material at an interface between the movable cover and the housing. A releasable lock is arranged to releasably lock the cover in the closed position, the releasable lock being manually manipulable by a user's fingers to release the lock to permit access into the housing through the opening. The elastomeric material is overmolded onto and thus permanently connected to the relatively rigid material of the movable cover.