Universal key

Homemade cars / Useful and interesting / Workshop / Different 46 798 3

Hello everyone dear friends! Today we will make a very simple and effective device, which will certainly be useful to people who do auto repair, plumbing, carpentry, etc. Such a thing may well be useful in ordinary household life.

This simple contraption is a universal wrench that can unscrew anything. The wrench handles any diameter of nuts and bolts perfectly, and it also has excellent adhesion to any smooth surfaces, such as a water pipe.
Compared to a universal gas wrench, this design has certain advantages. A gas wrench has only two engagement planes, which in turn can deform the part being unscrewed under strong pressure. Our tool has a “soft” grip due to contact along the entire plane of the part being unscrewed.
Test on a wooden log. On the left is our universal key, and on the right is the gas key.

Also, due to the specificity of its design, this wrench is endowed with the ability to work as a universal wrench with a ratchet mechanism: preventing parts from scrolling in the desired direction and easily being thrown to the beginning in the opposite position.

To make such a universal key you need only two parts:

- Square metal profile 25x25, length 300 mm.
- Motorcycle chain 500 mm long.

Universal key assembly

Assembly is incredibly simple and will take you no more than 5 minutes including preparation.
All you need to do is weld one end of the chain to the metal profile. It is better to weld on both sides of the chain.
This completes the assembly. The universal key is ready for use.

Using a universal key

Let's pass the second end of the chain into the center of the profile and you will get a ring that just needs to be put on the part that you want to unscrew.

In this tool, the chain is broken and the greater the lever force, the stronger the gripping force of the chain.
The key perfectly hooks both round and faceted objects. It doesn't make much difference to him whether it's a nut or a pipe.

Tests

Test key on a round pipe:

Sample wrench on hex nut:

The result in all cases is simply excellent. The grip is excellent. Doesn't turn anything around.
This miracle also perfectly unscrews plastic and polypropylene pipes, without significant deformation, which is so important when working with soft plastic.

This useful key won't take up much space in your car, garage or home. But it may definitely come in handy when you need it most.
So friends, feel free to make your own universal key.