Canvas Stretcher Frame with Continuous Tine Channels
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Solution Overview
Problem
The production of custom-sized canvas stretcher frames is labor-intensive due to the need for mortised joints and additional joinery, particularly the preparation of perimeter members, which limits the ability to create frames of varying dimensions without extensive cutting and assembly processes.
Innovation Solution
A canvas stretcher system using pre-formed perimeter and corner members with continuous tine receiving channels and mounting material channels allows for the assembly of custom-sized frames without additional mortising or joinery, enabling easy adjustment and attachment of cross bars, thus simplifying the production of frames with desired perimeter dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional mortised joints and additional joinery are used for assembling stretcher frames, then frame stability and strength are improved, but labor intensity and production time increase significantly
Solution Approach 1:
The stretcher frame is divided into modular components: corner members with pre-formed mortised channels and straight members with corresponding tines. This segmentation allows each component to be manufactured independently with standardized joining features, eliminating the need for on-site mortising while maintaining joint strength through precise factory-prepared connections.
Solution Approach 2:
The mortised channels are pre-formed in corner members and the tine receiving channels are pre-formed in straight members during manufacturing. This preliminary preparation of joining features eliminates the need for labor-intensive mortising and joinery operations at the assembly location, significantly reducing production time while ensuring consistent joint quality.
2Adaptability or versatility
If custom-sized frames are produced by cutting and assembling traditional components, then frame size adaptability is improved, but the complexity of joinery preparation increases
Solution Approach 1:
The corner members are designed with universal mortised channels that can accommodate straight members of varying lengths. The continuous tine receiving channels in both corner and straight members allow for flexible assembly configurations, enabling the production of custom-sized frames without requiring different joinery preparations for each size variation.
Solution Approach 2:
By pre-forming continuous tine receiving channels in the straight members and mortised channels in the corner members during manufacturing, the system eliminates the need for complex on-site joinery preparation. This allows frames of any size to be assembled using the same standardized components and joining method, simplifying the customization process.
3Productivity
If pre-formed corner members are used to eliminate mortised joint preparation, then assembly time is reduced, but the ability to adjust frame perimeter dimension is limited
Solution Approach 1:
The corner members incorporate adjustable mechanisms that allow the distance between the two straight members connected to each corner to be modified. This dynamic feature enables the frame perimeter dimension to be adjusted after assembly, maintaining versatility while preserving the speed benefits of pre-formed components. The adjustment capability allows re-tensioning of canvas when material dimensions change over time.
Data Source
AI summary
A canvas stretcher frame and method for fabricating same is provided comprised of four perimeter members and four corner members. Each of the perimeter members demonstrates continuous and uniform corner tine receiving channels, mounting material receiving channels and a cross bar mounting channel running the entire length of the perimeter member. The corner members are formed of two corner sections and can be opened, via a key to increase frame perimeter. Due to the continuous and uniform shape and configuration of the perimeter members and the affixation means formed therein, the perimeter members may be cut to form a frame of any desired perimeter dimension without need for further mortizing or machining of the cut member prior to assembly.