Interconnected Plate Stretcher for Canvas Frame Tensioning
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Solution Overview
Problem
Conventional canvas stretcher devices risk damaging the canvas, are difficult to adjust, and are not easily removable once mounted, with existing solutions either requiring multiple wedges or being limited to specific frame configurations.
Innovation Solution
A device using interconnected plate members that can be easily mounted and adjusted in a single operation, allowing for precise separation of frame sections without damaging the canvas, and can be used on already assembled frames with compact design and adjustable mechanisms like excenter, pin, or ratchet mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional wooden wedge stretcher is hammered into the frame corner, then the frame sections are forced apart to stretch the canvas, but there is a significant risk of damaging the canvas and the device cannot be easily removed
Solution Approach 1:
The stretcher device incorporates movable plate members that can be adjusted between inserted and removed positions. The plates are connected via an excenter mechanism that allows dynamic adjustment of the separation force, enabling the device to adapt to different canvas tension requirements while minimizing damage risk through controlled, reversible action.
Solution Approach 2:
The plate members serve as intermediary elements between the user's adjustment action and the frame sections. These plates insert into grooves in the frame sections and transmit the separation force in a controlled manner, acting as a mediator that distributes force evenly and prevents direct impact damage to the canvas.
2Force
If a conventional wooden wedge stretcher is used, then the canvas can be stretched, but it is very difficult to adjust the force applied onto the frame sections
Solution Approach 1:
The excenter mechanism connects the plate members in a way that allows continuous adjustment of the separation distance and applied force. By rotating the excenter mechanism, the user can dynamically control the degree of separation between frame sections, providing fine adjustment capability that was absent in conventional fixed-wedge stretchers.
3Reliability
If the wedge stretcher is mounted onto the frame, then the canvas is stretched, but the wedge is not easily removed once mounted
Solution Approach 1:
The plate members are designed to be movable relative to each other through the excenter mechanism, allowing the device to transition between a mounted state (providing reliable canvas tension) and a removed state (for repositioning or storage). This dynamic design enables easy removal while maintaining reliability during use.
4Reliability
If multiple separate wedges are used in each frame corner, then the canvas can be stretched, but the device complexity increases and multiple components are required
Solution Approach 1:
The invention combines multiple functional elements into a single integrated device. Instead of using separate wedges for each frame corner, one stretcher device with interconnected plate members can address multiple corners, reducing the total number of components while maintaining effective canvas stretching through the coordinated action of the plate members.
Data Source
AI summary
The present invention relates to a device for separating first and second abutting frame sections of an assembled canvas frame. The device comprises first (1) and second (2) plate members, wherein the first plate member (1) is adapted for insertion into a groove in the first frame section of the assembled frame, and the second plate member (2) is adapted for insertion into a groove in the second frame section of the assembled frame. The first and second plate members (1, 2) are interconnected and the first plate member (1) is moveable in relation to the second plate member (2). Movement of the first plate member (1) results in separation of the frame sections. The present invention further comprises a method for separating first and second abutting frame sections.