WW1 Austro-Hungarian Patent Designs WW1 US Patent Designs

Roy / Lzarnopyski Infantry Fort

United States of America/Austro-Hungarian Empire (1919)
Infantry Fort – None Built

World War One was, by 1918, the largest and most costly war in terms of lives in the history of mankind. Starting in 1914, the war finally ended officially in June 1919, with the signing of the Treaty of Versailles, although, with the signing of the Armistice in November 1918, all active combat between the Allies and Central Powers ended. The United States had been late to the war, only joining on the side of the Allies in April 1917. For the period of the war which remained, the US built its own derived version of the Renault FT, changed to suit imperial units, and later, the heavy tank Mk. VIII, which was the product of a joint British / American development.

In the meantime, various inventions and designs were being submitted to the US Government and Army or just espoused in the media. These presented military vehicles of varying degrees of practicality and reality. Probably the last such vehicle to be submitted during the active phase of WW1 was filed with the US Patent office just 2 days prior to the Armistice of 11th November – this was the Infantry Fort of George Roy.

The Men

George Roy described himself as a subject of the Austrian Emperor and submitted the patent in his own name, as the inventor, along with a second man, Piotr Lzarnopyski. Roy assigned half the value of the design to Lzarnopyski, presumably because Lzarnopyski helped pay the required filing fees, as his name appears nowhere else on the patent application or drawing. Both men were identified as residing in Chicago, Illinois, and no nationality was given for Lzarnopyski, although the name is likely Polish in origin. Sadly, neither man appears to have applied for other patents before or subsequent to this one, so very little additional information can be gained on who they were or how they came to the design submitted in their names.

The Design

The intent behind the design was to provide a mobile tracked platform from which soldiers could deliver firepower upon the enemy, as well as be elevated and protected by armor when being transported.

The overall shape is one of a large flattened triangle, with the reverse angle of the triangle formed into a series of steps up which soldiers were to climb from a small projecting platform at the rear. Three steps would bring a soldier to the top fighting platform of the vehicle, from where he could fire from behind cover.


The triangular body of the vehicle was dominated by the large angled front glacis, which curved very slightly across its width, providing a well-shaped surface to deflect enemy bullets. In the recess of the curve of the glacis was a small curved firing step or platform on the front. At the top of the vehicle, where the glacis met the roof, the roof itself was just the flattened peak of the triangle, forming the top of a wall from behind which men could shoot.

The plan view of Roy’s design is dominated by the features on the left of the small platform and large curved front glacis. Note the use of two small anchors on the right right of the image.
Source: US Patent US1299620 amended by the author.

Behind this was a series of short steps down to a platform at the tail. Within the triangle, formed by the glacis and these steps, was the body of the vehicle, with a single rectangular door on each side. The tracks were arranged in a triangular pattern, with the top flattened. This matched the shape of the body of the vehicle. The track itself appears from the patent to have used pronounced square section timber spuds attached to the links and was pulled around via a sprocket, which was the rearmost of the two wheels at the top flattened part of the track. This drive sprocket was rotated by a simple chain drive from the engine, which was mounted onto a floor frame inside the body of the vehicle. Eight toothed road wheels were arranged evenly spaced on the bottom, against the ground portion of the track, spreading the load of the vehicle on the ground. No return rollers, jockey wheels, guide beams, or similar supports are shown to support the track either on the way up from the front or on the way back down at the back.

The track itself is full width, i.e. there is only this single track rather than one on each side. Power to drive the track does not get delivered via a sprocket on the left or right but via one arranged towards the center of the width of the track.

The flattened triangular arrangement of tracks taken from US Patent US1299620, with the vehicle parts edited out to highlight the track and engine. Source: US Patent US1299620 amended by the author.


The front of the vehicle was formed from one enormous and continuous glacis, from just above ground level all the way to the top of the tank, forming a door-stop shape. This angled plate would serve to deflect incoming enemy bullets and, whilst there is no armor thickness mentioned – the protection was only ever mentioned to serve against bullets. Thus, a thickness of not more than 8 mm might have been needed to provide the sort of bullet deflection Roy was intending. The steps were meant to be made from bullet-resistant armor plates, as this would allow men or stores to be carried inside the vehicle in safety.

Seen from the front the enemy can only see the enormous glacis plate and the bottom of the full-width track.
Source: US Patent US1299620 amended by the author.

The entire body surrounded the tracks at the front, covering them from enemy fire and likewise at the rear. The sides of the vehicle were protected as well, as this armored covering extended down to the same level as the glacis at the front.

Side view of the vehicle, with the sides shown completely enclosing the sides. The only feature that is drawn is the side door.
Source: US Patent US1299620 amended by the author.


Roy envisaged the vehicle in use as effectively a mobile armored wall, rather than a fort, despite the name he applied to it. With no sides or rear protection for the men using this as a firing platform, all of the firepower and armor was directed only to its front. Seen from any other direction, it would only serve to provide a series of easy and well elevated human targets for an opposing force to pick off.

Seen from the rear, all there is to Roy’s design is the steps and a full-width hinged door below the top step. A small space inside could store additional ammunition.
Source: US Patent US1299620 amended by the author.

The vehicle was clearly intended to either operate in the attack as a platform, or forming some defensive line with other vehicles, as it could be anchored to the ground by means of a simple anchor operated from the small platform at the rear.

The very simple ground anchor for the vehicle. Two of these were drawn with one on each side of the rear platform.
Source: US Patent US1299620 amended by the author.
The British Pedrail tracked shield of 1915. A poor idea that never saw service and yet was still better than Roy’s design in almost every regard, as it was a smaller, cheaper, and simpler machine providing more cover for soldiers behind it. Source: UK National Archives.


No form of propulsion was mentioned, other than the single comment describing the vehicle, where Roy stated it was to have a “motor driven track”. Driven from a single, high-mounted sprocket roughly central in the width of the single track, it is unclear how or even if the machine could be steered.

The engine is located slightly off-center, to the right side of the vehicle.
Source: US Patent 1,299,620 amended by the author.


Roy provided no information at all about any potential crew for the vehicle and, as it was not armed, presumably just a single person would be required to drive it. There is no indication as to where a driver might go, as there are no vision slits or windows provided from which someone inside could see out.


On the topic of practicality, there really was none. The design provided zero protection for the men using it as a firestep from either the sides, rear, or above. Any crew would certainly have struggled to control such a vehicle with no clear idea as to how to steer the machine. It seems Roy intended it to be able to go only forwards.

For a period earlier in the war, this kind of naive tracked shield, for want of a better term, might have been forgivable, but the design was submitted in 1918 – more than 2 years after the first tanks had seen combat and long after images were to be found easily in newspapers around the world. There is simply nothing at all offered by this design that was not or could not be delivered better by a tank or something even simpler. Even the tracked Pedrail Shield of 1915 surpassed this idea, as it was simpler and provided better protection. Unsurprisingly, offering nothing at all to anyone, this design never progressed past the patent office.

Roy / Lzarnopyski Infantry Fort. Illustration by Pavel Alexe.

Roy/Lzarnopyski Infantry Fort specifications

Crew 1? (driver)
Propulsion engine of unknown type
Armament none
Armor bulletproof
For information about abbreviations check the Lexical Index


US Patent 1,299,620 Infantry Fort, filed 9th November 1918, granted 8th April 1919.

2 replies on “Roy / Lzarnopyski Infantry Fort”

Leave a Reply

Your email address will not be published. Required fields are marked *