Corner Clamp Canvas Stretching for Even Tension and Clean Edges

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Solution Overview

Problem

Existing canvas stretching systems require costly tools, are difficult to align, apply uneven tension, and result in unsightly edges and bulked corners, limiting user-friendliness and adaptability to non-standard dimensions.

Innovation Solution

A modular canvas stretching system using mitered stretcher bars with adhesive strips, locking corner clamps for alignment, and U-shaped fasteners to maintain tension, allowing for easy assembly and even tension distribution without staples, and adjustable spacer blocks for various widths.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If traditional stretching pliers and staple guns are used to attach canvas to stretcher bars, then the canvas can be stretched and secured, but the process becomes costly, difficult, and requires specialized tools that are not readily available

Engineering Contradiction:

Improveease of canvas attachmentVSAvoidcomplexity of stretching system

Core Design Contradiction:

Ease of manufactureVSDevice complexity

Solution Approach 1:

The patent replaces the traditional mechanical stretching system (stretching pliers and staple guns) with an adhesive-based attachment system. The adhesive strip applied to the stretcher bars eliminates the need for specialized stretching tools and staples, making the process accessible to novice users without requiring costly equipment while maintaining secure canvas attachment

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The adhesive strip system allows the canvas to be attached through a simple self-service process where the user applies adhesive to the stretcher bars and presses the canvas into place, eliminating the need for specialized tools or complex mechanical operations that traditionally required skilled operators

Inventive Principle:

Principle #25Self-service

2Manufacturing precision

If stretching pliers are used to apply tension to the canvas, then the canvas can be stretched tight, but the tension becomes uneven causing stress on the frame and wrinkles in the material

Engineering Contradiction:

Improveuniformity of canvas tensionVSAvoiddifficulty of achieving even tension

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The patent replaces the mechanical tensioning system (stretching pliers) with an adhesive attachment system that naturally distributes tension evenly across the canvas surface. The adhesive strip along the entire edge of the stretcher bar provides uniform attachment points, eliminating the uneven tension and frame stress caused by localized mechanical stretching while simplifying the operation for users

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Strength

If staples are placed on the side of stretcher bars to secure the canvas, then the canvas can be firmly attached, but the side edges become unsightly and corners bulk up

Engineering Contradiction:

Improvestrength of canvas attachmentVSAvoidaesthetics of frame edges

Core Design Contradiction:

StrengthVSShape

Solution Approach 1:

The patent extracts the visible attachment elements (staples) from the exterior surfaces of the stretcher bars and replaces them with an adhesive strip applied to the inner or side edges. This maintains the secure attachment strength while eliminating the unsightly appearance of staples on the frame edges and preventing corner bulk-up, resulting in a clean aesthetic finish

Inventive Principle:

Principle #2Taking out (Extraction)

4Ease of manufacture

If standard dimension stretcher bars with machined ends are used, then the frame can be assembled with interlocking corners, but the system cannot accommodate non-standard dimensions and requires precise squaring and alignment

Engineering Contradiction:

Improveease of frame assemblyVSAvoidadaptability to different canvas dimensions

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The patent introduces adjustable corner clamps that can accommodate various stretcher bar dimensions and configurations. These clamps provide dynamic adjustment capabilities, allowing the frame assembly process to adapt to different canvas sizes and shapes while maintaining ease of assembly through simple clamping and alignment mechanisms

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The adhesive strip system and adjustable corner clamps create a universal framing solution that can accommodate standard and nonstandard dimensions. The adhesive application method and corner clamping mechanism work across various stretcher bar sizes and configurations, eliminating the limitation of fixed standard dimensions while maintaining simple assembly procedures

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS8752312B2Canvas stretching system with corner clamps

Publication Date: 2014.06.17 VAZ PAUL

AI summary

A stretching system to stretch a canvas or material on a frame without the use of stretching pliers and staples. Special purpose corner clamps are used to secure the stretcher bars into an initial open miter frame to orient the double sided adhesive strip on the side of the stretchers towards the canvas or material while maintaining the adhesive strip from touching the canvas or material. After alignment, the stretching bars are pressed down and attached onto the canvas or material and the corners are released. The corner clamps are removed and canvas or material corners are cut and folded into the open miter ends which also have adhesive strips. By rotating the stretchers axially 90 degrees into the final frame, thus closing the miters, and upon inserting U-shaped fasteners into the grooves placed on the back of the stretcher, the canvas or material is stretched and ready to display.