Mows a knife. Drawing, description

TOOLS AND MECHANISMS FOR AGRICULTURE
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Mows a knife. Drawing, description

Tools and mechanisms for agriculture

Directory / Tools and mechanisms for agriculture

If you don't have a trimmer, your neighbor won't break it... So, to paraphrase a well-known song, you can start a story about problems with manual lawn electric mowers. Most models of imported electric trimmers (from the English word trim - trimming, haircut) are clearly not designed for mowing Russian near-house clearings, and even more so weeds near fences.

The very first foreign object caught in the grass leads to the failure of an important working part of the trimmer - the line reel. It was such a nuisance that happened to my friend Nikolai.

You can, of course, go shopping and buy analog Chinese spare parts (since original branded ones are expensive). But what's the point of spending money and time until the next rebar in the grass!

There is another way out of this situation - to think and find, so to speak, a "bypass" option.

"My neighbor somehow screwed a puck with thin stainless steel knife blades onto his "native" coil and now he is chopping everything with them!" - prompted a friend.

All clear! I have a tube, and a washer, and a stainless steel sheet ... But it will only look rougher.

"Not about aesthetics! The main thing is that the technique works!" - in the hearts, passionately, Nikolai explained the task to me.

To begin with, we turned on the trimmer and, substituting a hacksaw for metal to the remnants of the side walls of the coil, cut off everything superfluous. Now there is a plastic shaft to which something must be adapted.

The disc cutter worked, sawed a file, welding sparkled, a drill buzzed, a hammer riveted. At the end, the pliers unbent the antennae of the copper cotter pin.

Mows knife
The position of the knives in the free state

Modernized working attachment of a manual electric lawn mower with metal blades instead of fishing line (click to enlarge): 1 - shafting; 2 - working nozzle; 3 - protective cover; 4 - copper cotter pin

Some tricks:

it is not easy to find suitable tubes for the sleeve, as well as a washer, therefore, to fit the tube along the shaft, it makes sense to cut a longitudinal strip of 2–4 mm from it, and then hammer it down to the desired diameter;
the washer can be made with a chisel and a round file from sheet steel;
it is enough to grab the washer to the tube by welding at 3 - 4 points on the docking circle;
instead of steel rivets, use ordinary M4 screws;
it is more convenient to drill holes for the cotter pin in place, after installing a new tool nozzle on the trimmer shaft.

The simplicity of the design made it possible to do everything in 30 minutes and conduct successful tests, first on the yard lawn, and then, by unwinding the coils of my own and another electric extension cord taken from a neighbor, and on the street, destroying weeds.

Mows knife
The position of the knives in working condition

The working part of the electric lawn mower (click to enlarge): 1-base sleeve; 2-washer (steel, sheet s3); 3 - knife (stainless steel, sheet s1, 2 pcs.); 4-steel rivets (M4 screw, 2 pcs.)

Mows knife
Turned steel base sleeve (more practical option) electric lawnmower

"Great! Just what you need! Doesn't mow, but shaves! Take a picture of the structure "for history" and it's time to go home, and tomorrow - for mowing!" - Nikolai summed up our meeting.

Such a design, of course, is much more efficient than the standard version with a cutting element made of fishing line, but it is also more dangerous. With such a trimmer, you should stay away from people, work in boots, and most importantly, avoid extreme wear of the petals and rivets.

Author: A.Matvejchuk

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