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An individual axis locking, toolbar clamp, for weeding machinery and other uses.After decades of being frustrated with the design of the toolbar clamps on weeding machinery, and nearly a decade of sitting on the idea, and weeks of working out the best solution, I have finalised my design for a user friendly, light but strong and simple to build toolbar clamp, which I have very immodestly called the ‘Merf clamp’. Download the design from the Physical Weed Control Forum Website Mechanical weeding is becoming ever more important due to challenges to herbicides, such as evolved resistance and legislative prohibitions. One of the main alternatives to herbicides are mechanical weeders, such as interrow hoes. Many mechanical weeders have weeding tools, such as hoe blades, attached to a toolbar by a clamp. There have been many clamp designs made over many years, but from the perspective of the end user they all suffer from a number of deficiencies. The main problem on many clamps is that a single bolt locks both the horizontal adjustment of the clamp along the toolbar, and the vertical adjustment of the tool leg. While simple in design and engineering, it means that when only one axis needs adjusting both axes are loosened and the axis that does not need adjustment can move and lose its position, making them difficult to position accurately. While more complex, it is better for each axis to have its own individual locking system. A few clamps need to be slid onto the end of the toolbar, which is problematic if there are already other tools mounted on the bar that are in the way. Ideally a clamp should be able to be directly slid onto the toolbar in the exact location it is required. Similarly many clamps require the tool leg to be slid up through the clamp. This may require the machinery to be lifted up to allow the tool leg to be slid into the clamp, or other inconveniences. A lot of clamps use a locking system where the end of a bolt or set screw pushes against part of the tool leg and / or toolbar. This can result in the end of the bolt or set screw becoming damaged, such that it cannot be taken out of the clamp. Likewise the area on the toolbar and tool leg where the bolt impinges can be damaged, making it difficult to move along the toolbar and move the tool leg inside the clamp. To address these limitations a new design of toolbar clamp has been invented. The overall design aims of the clamp are:
The result is the 'Merf clamp'! The design has been made freely avalible under an Open Hardware Licence and is avalible for free from the Physical Weed Control Forum Website
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