Ukrainian Scissors





Introduction: Ukrainian Scissors

Invention Challenge 2017

Runner Up in the
Invention Challenge 2017

When cutting hard cardboard or like haven't you ever asked yourself:"Why isn't the biggest mechanical advantage of the scissors where it's needed most of all - at their tips?"

The Ukrainian Scissors leave the above question in the past.

This invention is especially great for craft, DIY, repair, home improvement, and other applications (e.g. science, medicine, even a manicure) where precision, easiness, and convenience when working with tough materials are critical.

Compared to regular scissors (the least mechanical advantage is at the tips) and the "Swiss scissors" (mechanical advantage along the blades is all the same 1:1, seemingly not enough for the hard cardboard), the Ukrainian Scissors' principal innovation is the biggest mechanical advantage being available where it's needed most of all - at the scissors' tips. This is a huge advance by itself.

The main features of the Ukrainian Scissors are the following:

1. The biggest mechanical advantage (7:1 in the working prototype) is where it's needed most of all - at the tips of the scissors as a virtual fulcrum is in front of them (unique ergonomic feature, great for precision work like craft, etc.);

2. Minimal slipping risk due to a narrow gap (small cutting angle) all along the blades (safety and convenience);

3. Much shorter than regular scissors with same maximum mechanical advantage and blade length, user's hand is much closer to the working area (precision, convenience, storage);

4. The tips are the slowest moving parts of the scissors what is great for precision work.

Watch an animation above and see the steps below to better understand the idea behind the Ukrainian Scissors and possibly to make a pair of them for your personal use.

Step 1: Make the Blades, Guides, and Washers

The drawings above are for guidance only and can be adjusted for your preference (all dimensions are in millimeters). In this embodiment all the paired parts of the scissors are identical for simplicity. The blades can be laser-cut from 3mm steel. The springs can be cut from any appropriate spiral spring (either round or rectangular). You can also use any appropriate screws (M3x0.5 in this case) from the box to attach the guides to the blades. For simplicity, the guides can be made cylindrical, btw.

Step 2: Assembly

Assemble the parts as shown on the image above. To provide better contact between the blades' edges the contact elevations can be formed on the blades by removing some material from the adjucent areas, as shown on the image above.

My first (very) rough prototype is shown on the photo and video. Yours can be much better!



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    Didn't mean to open a hornet's nest with my left-hand comment.

    If you watch how scissors actually work, when you apply closing pressure on the scissors, you are actually applying two directional forces at the same time. A closing force but also a side to side force. Your thumb and fingers are closing up the blades, but also squeezing the two blades against each other at the same time. It is how they work properly. When a left-hander uses the same scissors in their left hand, they are still applying closing pressure, but are now applying pressure to open the blades from each other instead of closing them against each other. And that makes the scissors not cut like they are designed. So there are left-handed scissors to solve that problem. I do remember seeing a left-handed shop one time that had so many daily items made specifically for left- handers. We are not a majority force in the population, buy there are tons of left hander people in the tech and STEM field that seem amazing to me. While the percent in everyday left-handed population is around ~10%, the STEM tech fields have nearly 40%. Why, I don't know.

    I guess you would reverse the diagram to make left-handed scissors. So many wrongly think that left-handed scissor are not needed. But when a left-hander uses a right-handed scissor, the forces applied actually separates the cutting edges instead of forcing them together. And for that reason, left-handers can't cut a lot of different materials as well using typical scissors. Yes there is a difference.


    As a rather observant person who has a lefty for over fifty years I can honestly say I have never seen a left-handed person use left-handed scissors in anything beyond grade school. And even more to the point as lefties are generally somewhat ambidextrous, they generally use right-handed scissors better than right-handed people. Draw a circle on a piece of paper sometime and ask a right-handed person to cut it out. As a lefty it is absolutely hilarious to watch.

    No love for the left handed scissors?!?

    Not sure how you have never seen this. Many specialty scissors are available in left hand models they are just not normally stocked by companies because we lefties only make up a small portion of the population. If you ever get a chance to use a pair of left handed scissors you will find they work very well.

    To the original comment I would love to see a left handed version of these.

    My best find is a left handed utility knife, with slide out snap-off blades. It is actually a convertible design, the blade is inverted to change it over. I can adjust the blade with my left thumb. I highly recommend them.

    As someone with left handed relatives, I've seen that they do use left handed scissors. Particularly for cutting fabric.
    I've also seen some "left handed" scissors that were badly designed.

    With a normal right handed pair, used in the right hand, to the right side of your line of sight, while cutting, the lower blade is to the left, and the upper blade is to the right, so you can see the cutting point in the material. Also, pulling your fingers towards your palm while pressing outward to the left with your thumb tends to press against the handle in a way that presses the blades together into tighter contact. More important if the pivot is loose.

    Using the same scissors in the left hand, the upper blade obscures the material being cut, and your hold on them tends to separate the blades.
    This is aside from the fact that if they have molded handles, it can be painful to hold them in the wrong hand.

    The badly made pairs I mentioned, use right handed blades, in left handed molded handles, so they can't be used right handed, and left handed, you can't see what you are cutting, and natural squeezing motion separates the blades, so they don't cut well.

    I can't wait to see this for sale online someday!

    I hope to see these for sale someday online! Well done!

    Hobbyist metalworker/blacksmith here. Tinsnips come in right-side "junk", left-side "junk", or center-cut. None of which do what would be easiest for a right-hander, which is to control were the "good" cut piece ends up, especially with the tips. It is either bent up or down, which means that you'd need to flatten the piece afterward, and minute cuts are impossible. This design SEEMS like it would solve that aspect. However, real-world tests would be needed.