Imagine two climbers helping each other climb a rockface. Lets call them A and B. Climber A gets to a secure position and lifts B. Then B moves ahead and lifts A.

A lifts B, then B lifts A.

An Orbilift climbs using this principle. It has two sets of arched legs, A and B, joined by an arm. In an alternating sequence, they lift each other from one place to the next.

A lifts B, then B lifts A.
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The Orbilift invention legally belongs to Orbilift Pty Ltd Australia and is protected with patent-filings in multiple jurisdictions, globally.

The leg of an Orbilift is curved, like an arch, to span uneven ground.

The arch provides a strong, stable base, from which an Orbilift can lift itself. This is fundamental to achieving safe, steady, predictable motion.

Compared with a human leg, which has multiple joints, an Orbilift's leg is stronger, because it is a single, continuous beam.

The Orbilift is a multi-use platform. It can be used in many situations.

Fitted with a seat, it can be a stair-climbing wheelchair. Fitted with a container, it can be a delivery robot.

Fitted with sensors, it can explore the surface of a planet. Fitted with GPS, it can substitute for a guide dog and lead a blind person.

An Orbilift can be big or small. A small Orbilift could be used as a toy. An industrial-sized Orbilift could be used in mining or construction.

An Orbilift can adapt automatically, to a range of inclines. This is useful because some stairs are more steep and other stairs are less steep.

As it takes a step, its leg, in mid-air, can adjust its tilt, to match the incline of the surface below.

This adaptivity enables an Orbilift to travel from one building to another building, adapting to different stairs encountered in each building.

A tank track can climb stairs. So what makes an Orbilift better?

Tank Track:
1. Seesaws uncontrollably at the top of a stair.
2. Prone to slipping.
3. Shudders due to imperfect engagement of ribbed-track to stair. Causes damage to stair.

Orbilift:
1. Stable throughout its motion cycle.
2. Not prone to slipping.
3. No damage to stair.

An Orbilift treads softly and precisely, making it practical for everyday use, in people's homes.
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END OF SECTION 3