Mechanical Horses

Gallery opened 5 Oct 2022

Page updated: 1 Nov 2022

Chebyshev's Walking Machine added
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Some people have felt that what the world needed was a mechanical horse; not a motor-car but a machine with mechanical legs. One motive was to get better off-road performance. A major difficulty if you want to construct a realistic mechnical horse is that horses have at least five ways of moving their legs; the walk, the trot, the canter, the gallop, and the pace. See Wikipedia on horse gait. There are also many kinds of ambling gaits which are faster than a walk but usually slower than a canter; ambling gives a smoother ride than either a trot or a pace.

Most, if not all, inventors seem to have decided that producing one gait was quite enough.


THE POTTER CART

This is not strictly a mechanical horse, but it does have four legs.

Left: The Potter Cart: 1663

This four-legged cart was invented by Francis Potter. (1594 -1678)

Robert Hooke (1635 - 1703) was Secretary to The Royal Society from 1677 to 1682). Potter's invention was presented to The Society; Hooke made this drawing and added the comments at lower left. These read:

Let h. denote a horse
CC. a cart wth 4 leggs.
ffff. the feet of those leggs.
kkkk. the knees.
pp, a couple of pulleys fastened upon the ends of two springs: SS. on wch run
the chaines cccc, wch
move  j legs forward.
R, a rope or chaine to pull the for most leg straight
"Mr Hookes account of the Cart wth Leggs brought in by Mr. Aubery from Mr Potter was Read and the same wth. some alterations was orderd to be sent to the author of this Inuention together wth. the thanks of the society. Mr Hooke was also orderd to draw up a full Description of this Cart together wth. the scheme thereof to the end that it may be entred. wth the animaduersions upon it"

"Have drawn the Cart with Legs tho' I doubt its practicability." was Hooke's comment to The Royal Society. It is hard to disagree.

Source: Minutes of The Royal Society

It is unclear what the purpose of this invention was. Perhaps it was meant to out-perform wheeled carts on rough ground; it seems highly unlikely that it would have been attended with any success. There is nothing to move the legs apart from the forward pull of the horse.


BRUNTON'S TRAVELLER

Left: Brunton's Traveller: 1813

In the early days of steam locomotion there was much doubt about the ability of steel wheels to gain traction on smooth steel rails. Brunton's Traveller did not drive its wheels and instead had two bizarre legs at the rear to push it forward; each leg was driven by a steam cylinder. Two chains marked f and f lifted the legs on the forward movement. The diagram seems to have some parts missing, notably the piston rod driving the leftmost leg. On top of the boiler, between 2 and 5, there was a pinion engaging a rack on either side, to keep the legs moving in opposite phase. Nothing is known about the valve gear.

Unlikely as it may seem, the locomotive seems to have operated successfully between 1813 and 1815. Another larger walking locomotive was built, but came to a bad end:

"The invention excited much attention. It had the merit of acting as the designer intended it should, and one day that it was on trial, rushing along at a speed of three miles an hour, accompanied by a host of admirers, the boiler exploded, throwing hot water, pieces of iron, and disaster among the crowd. That ended the career of the Mechanical Traveller."

Apparently thirteen people were killed, and others injured. This is often considered the first railway accident. (NB This Philadelphia is in County Durham, England) It occurred 15 years before William Huskisson's fatal accident.

Source: Curiosities of Locomotive Design. From Development of the Locomotive Engine, by Angus Sinclair. Railway and Locomotive Engineering: September-December 1907

This locomotive has a good Wikipedia page.

You can see a fine model of the Traveller, built by Adrian S in 2017, on YouTube. Weights have been added to the leg-lifting mechanism.i

Here is a good video of the model walking on a turntable. This shows the rack and pinion mechanism.


Left: Chebyshev's Walking Machine: 1850

One of the first steps (ho-ho) toward a true walking mechanism was made by Pafnuty L Chebyshev, who is most famous as a mathematician.

Here is one of the better animations.

Left: Chebyshev's Walking Machine: 1850

Here are all the technical details of the Chebychev walker. It is operated by turning the double-cranks C' and C''. Best to have a look at the animation before trying to work it out.


Left: Pedal-powered mechanical horse patent: 1893

Unlike some of the other mechanical horses, it's pretty clear how this one works. Each leg is in two parts, the upper part Y pivoting on the chassis at its top end. The lower part of the leg S is moved by crank d and connecting rod R. The front and back cranks were driven by the central wheel to which the pedals were connected. This was geared-up by about two to one, and I would have thought it would require a great deal of force on the pedals to make this machine move.

The front gear F is of a barrel shape so it remains engaged when the front legs are turned for steering.

Source: Popular Science, April 1933


Left: Mechanical horse in Italy: 1933

This looks like a rather dangerous piece of machinery. It seems highly unlikely that it would be a good way to teach children how to ride a real horse, but that was its purpose. It was supposedly capable to traversing rough terrain. The authorities considered putting the vehicle into limited production to train the children of the Gioventý Italiana Littorio (Italian Fascist Youth Movement) to ride, but the Italian military deemed it impractical.

Teaching potential soldiers to ride a horse in 1933 may sound backward but many armies were still making extensive use of horses at this time.

Source: Popular Science, April 1933


Left: Mechanical horse : 19??

I have heard it said that this is a conversion of a Model-T Ford. If so it appears nothing is left of the original car but the engine. Nothing is known about it, and a reverse image search yielded nothing.

Presumably that great big chain-wheel drove some sort of system of cranks to move the legs.

Source: unknown


Left: Bogart horse : 1953

George Bogart of Cleveland Ohio built this model horse in 1953, for a bet.

It was powered by two six-volt car batteries. The pulley wheel in the middle of the rear axle could be connected to the electric motor if the hooves did not give enough traction. I think there may also be a bit of cheating going on as regards the steering.

The article text says the horse could walk, trot, run, or gallop; this suggests four different selectable gaits that would be very complicated to reproduce mechanically.

Source: Popular Mechanics Jan 1954

Left: Bogart horse patent: 1958

George Bogart's interest in mechanical horses was not a mere whim. In 1958, five years later, he took out this patent for a walking toy horse.

Figure 2 shows an electric motor 25A mounted in the cart being pulled. Power reaches Dobbin via a rather unfortunately-placed horizontal shaft.

Source: US patent 2,850,839 of 1958

Left: Bogart horse : 1953

Each leg had two joints and appears to have been moved by a wire or chain running to the bottom of the leg; this was pulled on by cranks. At front and back was a gearwheel driven by a worm gear on the horizontal shaft.

Here the electric motor 25 is mounted inside the body of the horse.

Source: US patent 2,850,839 of 1958


Left: Chinese Mechanical horse: 2014

This mechanical horse weighs 250 kg and was built by Mr Su Daocheng.

You will note just a little bit of cheating in the shape of a two-wheeled trolley just behind the front legs.

Source: Unknown

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