Canvas Frame Tensioning Screw Mechanism With Integrated Spacer Legs

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Solution Overview

Problem

Existing methods for tensioning a canvas on a frame require tools like stretching pliers, are time-consuming, and involve additional assembly steps, especially for larger frames, and prior solutions with rigid spacers are costly and require complex manufacturing processes.

Innovation Solution

A device with a spacer and screw mechanism that separates side members of a frame to tension the canvas, using a minimal number of parts and intuitive assembly, allowing for efficient stretching without external spacers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If traditional stretching pliers and manual tensioning methods are used, then canvas tensioning can be achieved, but the process becomes time-consuming and requires additional tools

Engineering Contradiction:

Improveease of canvas tensioningVSAvoidtime required for tensioning process

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The device performs preliminary action by pre-assembling the tensioning mechanism with the frame before canvas installation. The screw mechanism and spacer are positioned in advance, allowing the canvas to be tensioned simply by tightening the screw, eliminating the need for complex manual tensioning operations during the actual canvas stretching process.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The tensioning device is designed to be self-sufficient, with the screw mechanism automatically providing the necessary tensioning force when tightened. The spacer component self-positions between the frame members, and the entire assembly requires no external tools or manual intervention beyond simple screw tightening, making the system self-service oriented.

Inventive Principle:

Principle #25Self-service

2Reliability

If rigid spacers with multiple parts are used for canvas stretching, then effective tensioning is achieved, but manufacturing costs increase and device complexity increases

Engineering Contradiction:

Improveeffectiveness of canvas stretchingVSAvoidnumber of parts required

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The invention merges multiple functional components into a single integrated spacer element. The spacer combines the functions of positioning, spacing, and tensioning distribution that previously required separate rigid spacer components and multiple adjustment mechanisms. This consolidation reduces part count while maintaining effective canvas stretching capability.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The spacer component serves multiple functions simultaneously: it positions the tensioning mechanism, provides the necessary spacing between frame members, distributes tension evenly across the canvas, and maintains structural stability. This multi-functionality eliminates the need for separate specialized components, reducing overall device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If rigid spacers are inserted from outside frame members, then canvas stretching is enabled, but additional processing costs are required in factories

Engineering Contradiction:

Improvecapability to stretch canvasVSAvoidmanufacturing process complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The spacer is designed to be nested within the frame structure itself, positioning the tensioning mechanism from the inside rather than requiring external insertion. The spacer fits into a recess or cavity within the frame members, allowing the entire assembly to be manufactured as an integrated unit or with minimal additional processing, eliminating the need for complex external insertion operations.

Inventive Principle:

Principle #7Nested doll (Nesting)

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 device provides effective canvas tensioning with minimal parts, reducing manufacturing costs and simplifying the process, making it economical and user-friendly.

Implementation Method 1

A screw has a threaded shaft adapted for rotational engagement with the central aperture of the spacer

Methodology Applied

Scientific EffectScrew mechanism: Screw

Implementation Method 2

rotating the screw to move the spacer block to contact the ridge of the inner surface of each leg causes each leg to move outwardly

Methodology Applied

Scientific EffectMechanical force: Mechanical Force

Implementation Method 3

upon rotating the screw the spacer block moves between the inwardly-projecting ridges of the legs to push each leg outwardly

Methodology Applied

Scientific EffectMechanical interaction: Mechanical Force

Data Source

PatentUS20260008296A1Device for tensioning a canvas on a frame

Publication Date: 2026.01.08 GESPLAN GESTION CONSEIL INC

AI summary

A device for stretching a canvas mounted to at least a pair of side members includes a spacer having a central aperture therethrough and two opposing sides at an upper end that each terminate in a downwardly extending leg that is movable outwardly to engage an angled end surface of one of the side members. A screw engages the central aperture and has a threaded shaft that terminates at a screw head. At least one side wall is fixed with either the screw head or the spacer and is adapted for contacting the inside surface of each side member. In use, with the legs contacting the angled end surfaces, rotating the screw moves a spacer block to contact an inner surface of each leg to cause each leg to move outwardly to push the side members mutually away from each other to stretch the canvas.