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The Mobeick

"Knowledge is the only manor, that propagates, if you part it." - Marie von Ebner-Eschenbach.
Here I publish this drawing, therewith it will be build finally. Who wants to build it, shall contact me first. The thing with the patents and trade mark rights in Germany for not wealthy Germans is a joke. I already know this from my own experience.

+++ of topical interest (April 2017): The club HPV (Human Powered Vehicles) has this invention (Mobeick) at their ideas-competition 2016 (prize-money: 0 Euro) the "inventive highness" denied, has preferred to elect no winner, but stayed guilty of the proof, that the Mobeick already exists. They did not want to make themselves ridiculous. +++

Definition Mobeick:

A bicycle is a Mobeick, if it has at least the following features:
  • seat: chair- oder couchbike
  • propulsion: anti-phase, asynchronous or free, ergonomic wobbling of the feet
  • pedal: angle-tongued and with support for the heels
  • gear change: continuously variable lever

Here it is!
Bild "Inventions:Mobeick_grosserGang.png"
It is so simple!
continuously variable 1000% gear change
no problems with the knees at the chairbike any more
Bild "Inventions:Mobeick_kleinerGang.png"
for a small gear just shove the (green) taker downwards
for a little range it goes, so just choose this range!

There are shown three positions of a pedal on one side of a couch-trike (with drawn up knees, with stretched knee and a position between).
The left and right pedal are 180° phase-delayed. You can achieve this with a cone-cogwheel easily. In the hub of the back wheel is an encapsulated planetary gear (1 to 15) with free wheel within an oil bath. Instead chain, rope or gear rack it will do a simple conrod.

The construction is intended that way, that all movable parts are below the driver.

animation with rope
Bild "Inventions:A6_anigif_Modibike.gif"
one kick into the pedal at 2 different gears
the curves below: the angle-velocity of the back wheel

2,6 turnings / 0,25 turnings = 1000% !!!

If you do not want a rail, e.g. you do not like the noise, you can also take two combined pendulum-sticks. It looks like this:

another pendulum-system - asynchronous
Bild "Inventions:anigif_A1_Pedale_asynchron.gif"
pendulum-range without rail - slow pushing, fast pulling

The taker to the gear must be at the lower (green) pendulum-stick.
  • advantage: at a rail the bearings must be very tough and precise to keep the pedal on the rail or there must be a keyway. Here this problem do not occur.
  • disadvantage: a joint and a stick more.

Bild "Inventions:Pedal_Feder.png"
Pedal in middle position at unbent spring

Therewith the foot must not go always 100% the same way (this would lead to sleeping legs), there must be a spring at the pedal, so the feet can teeter a bit. You get the best transmission of power, if the axle is at the point of the shoe, where the heel begins. If you took the variation with the rail, you put the roll on the axle. The support for the heels has a deepening, so the pedal can better carry the shoe.

Pendulum from the side of the knee
with gear rack and a little gear
Bild "Inventions:Fahrrad_Zahnstange.png"

  • more than 3 turnings per kick in the drawing in an high gear
  • continuously variable and higher than at a racing cycle and without chain-polygone-effect
  • but ridiculous as the German bicycle club HPV finds!

If you take a real small pinion, you do not need a gear. The gear rack must be protected against mud.

Bild "Inventions:Fahrer2.png"

If you like it Isetta-meets-Robo-Cop-like, you can put the pedal on the side of the driver. The bicycle becomes shortened by this. If you choose the variation with the rail, you can put it between the legs. If you want to avoid a contact with the movable parts while driving, you can construct a casing between. This also reduces the air resistance. Note: if you put a wire around a ball, the air resistance gets lower. If you have an accident, the case protects the legs.

The 180° phase displacement

Therewith left and right leg can take turns, the pendulums must be phase displacemented. There are two possibilities to achieve a simple 180° phase displacement:

cone-cogwheele or scissors
Bild "Inventions:Kegelzahnrad.png"     Bild "Inventions:Schere.png"

At the variation with the cone-cogwheel, the axle of the cogwheel shows directly on the middle of the axle of the pendulum. There are two segments of a circle on the pendulums-sticks with the aptly thread.

At the variation with the scissors, a slot shows radial towards the middle of the axle of the pendulum. In this slot a point can run up and down. This point is combined with a point perpendicular to the pendulum-stick. The pendulum-stick on the other side is just mirrored. Because of the symmetry the direction is inverted on the other side.

The method with the cone-cogwheel is more elegant and in mass production cheaper. For a prototype the variation with the scissors will do it, too.

Now I found a new way to transmit the pendulum swing with a 180° phase displacement. But I do not show it here. Do I am the punch of all others?

Asynchronous wobbling
At kicking you always have two dead points because the direction changes two times. If you have an 180° phase displacement both feet are at the same time in the dead points. At the asynchronous wobbling the pushing is prolonged and the pulling is shortened. So the drawn up leg is a bit over its dead point when the other leg is in its.
If you drive uphill you always need some tension on the back wheel. With the asynchronous wobbling you can achieve this.

Bild "Inventions:Fahrrad_asynchron.png"

Free wobbling
If you draw up the knee the pedal must stay at the foot of course. You can achieve this by a clamp, a click-system or magnet under the shoe. At chair-bicycles it is a bit dangerous, because you lose the balance after you brake and then you must quickly put a foot on the street. If both pedals are linked, you can force the contact with the pulling leg and its pedal by pushing the other pedal. If you abdicate the coupling, you can wobble freely. To keep the pedals in contact with the shoes you can put a deepening at the support for the feet or you can use a spring.

It is your choice. It is best to take the variation with the cone-cogwheel and make it that way, that you can take the cogwheel out. So the driver can test both possibilities.

The gear

I found three ways for the continuously variable lever. Here they are:

Bild "Inventions:Gangsch_Kardan.png"Bild "Inventions:Gangsch_elektrisch.png"Bild "Inventions:Gangschaltung_Hydraulik.png"

  1. (Constant-Velocity-) Joint
    The one side of the joint is fixed with the frame of the bicycle, the other side turns a thread upon the lever. It hangs fluffily in a cage, so the joint is secured of impacts. If you take a normal cardan joint it makes in X-Position a smooth turning because of the cardan mistake. So give the joint a bit play or take a constant velocity joint!

  2. Electric motor
    there is an electric motor upon the joint of the lever, this is steered by wire or transmitted via radio

  3. Hydraulics
    along the axle of the pendulum a piston can move. To move and hold it, there is a thread with a turnable disc. The turnable disc snaps the hub of the pendulum. The other piston moves the taker of the lever radial. Due to the hydraulics the piston hub can easily amplified, around a 90° vertex, for and back.
    So hydraulics for the needs here are perfect.

classic pedal for chair-bicycles
Bild "Inventions:Sesselrad_Kurbel.png"
horizontal position
(red arrows: the force of the kick)

The problem at the known chair-bicycles with handle: you can only kick the pedal, if the pedal is brought from A to D. But for that the driver must traipse, because the heel cannot make an oblique angle. Therewith foot 2 stays on the pedal, you must give some pressure. But this pressure brakes the movement. The way from A to B goes over C. And there is an energetically useless hoisting of the legs. Easier is the way over M.


The first bicycle with strap propulsion was the "American Star Bicycle", invented 1880 by G.W. Pressey. It was a high-bicycle. At that time only rich people could afford a bicycle and these clients want to sit far above the ground. Because of the many accidents, the lower bicycles removed the high-bicycles.

After the invention of the chain the strap propulsion became forgotten. But it has two advantages:

  1. no bottom bracket bearing,
  2. continuously variable gear as far as you want.

Because of the unbalance within the bottom bracket bearing they have a great friction. In addition chains wear out, jump off, catch mud and have an inner friction.

Surely Mr. Pressey would have liked to give his American Star Bicycle a continuously variable gear but the fine mechanics were not that far developed. He had other problems.

At the Mobeick all this problems are solved.

The American Star Bicycle
Bild "Inventions:American_Steam.png"
with kick-support through a steam engine, 1884

The Jaray Bicycle
Bild "Inventions:Jaray.gif"
as postage stamp

The inventor Jaray denied the chains and went back to the strap propulsion. He built a chair-bike with 180° phase displacement. He puts it into practice with a rope that runs from one side on the other. But this is dangerous. If there is not enough tension on the rope, the rope might jump off. As gear he made three pedals. This is not so good, too, because the feet can tangle up.

The Mobeick does not have all this disadvantages.