Self-run. Drawing, description

PERSONAL TRANSPORT: GROUND, WATER, AIR
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Self-run. Personal transport

Personal transport: land, water, air

Directory / Personal transport: land, water, air

There are many different machines in the world with which we drive, swim, slide, even soar on an air cushion. Is it possible to make a car that resembles fabulous walking boots, so that it does not carry us on itself, but only helps to run tirelessly?

We offer you to get acquainted with such a machine, which cannot be called otherwise than self-running. It was invented by American inventor Bert Shulman. Perhaps the appearance of a person with such a unit behind his back at first glance will seem somewhat unsightly to you. Nevertheless, thanks to this "backpack" it is possible, as they say, "on foot" to reach speeds of up to 30 km / h, without feeling particularly tired.

(click to enlarge)

The power base of self-running is a small gasoline engine, such as on mopeds and light motorcycles. And the driving elements are two wooden or plastic "legs" with pushers. They help you run. How are pushers set in motion?

A kind of chain wheel-crank transmission is mounted under the engine. It is connected to the engine through a reduction gear, since even such a small engine will still be too fast. The gear ratio of the gearbox (the ratio of the radii or the number of teeth of the driven and driving gears) was chosen by the inventor close to 7. The engine and gearbox are connected to each other through a centrifugal clutch.

A small gear wheel is planted on the gearbox shaft - it is the leading one. The chain connects the drive sprocket to one of the driven ones, and there are two in total, one for each leg.

Since in all other respects the right and left foot pushers, as well as their drives, are exactly the same, let's consider the device of one, the right one: it is better seen in the figure. A connecting rod is attached to the side surface of the driven sprocket with the help of an axle. The other end of the connecting rod is hinged to the upper end of the leg element. When the rotating wheel moves the crank back, the leg element moves in the opposite direction and the right leg of the runner is thrown forward sharply. When the connecting rod goes forward, the leg element, along with the leg, deviates back. Of course, the crank of the left leg element is attached to its driven sprocket in antiphase with the right one.

What average speed can a runner equipped with such a self-runner develop? For masters of marathon running, the speed of 20 km / h to this day remains just a dream (Australian Derek Clayton's world achievement at a marathon distance of 42,195 km is 2 hours 8 minutes 34,8 seconds).

It is difficult to say what will happen to a person if you make him run at the speed of a motorcycle. Most likely, the musculoskeletal system simply will not withstand, because it is not designed for such a load.

Therefore, Bert Shulman equated the frequency of reciprocating movements of the leg elements with the frequency of steps during normal running. And this forced, in turn, to select the size of the driven wheels with special care. He used a four-tooth sprocket as a drive wheel, and a 45-tooth sprocket as a driven wheel.

The motor with gearbox, as well as the axles of the driven wheels and foot elements, are mounted on a wooden frame, which, in turn, is connected to an aluminum frame, similar to those of modern tourist backpacks. Between the aluminum and wooden frames there is a foam mat with a thickness of at least 50 mm. This is done because backpack frames are completely unsuitable for attaching any mechanisms to them, and the runner’s shoulders and back do not experience any inconvenience, although the weight of the self-runner reaches 10 kg.

The fuel supply, and with it the running speed, is regulated by a manual button, or a lever with a cable, like on motorcycles. This system is debugged by Shulman flawlessly - otherwise imagine what a ridiculous position he could be in: he ran to his destination, and the pushers continue to toss his legs. Whether you like it or not, run until you run out of gas.

Author: M.Lukic

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