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our latest in exoskeleton research

 

 

As we pursue the art of mechanical exoskeletons, we plan on releasing our discoveries.

We release our discoveries because we wish to see the ubiquitous mechanical exoskeleton available in all common households and in businesses.

We are currently developing an actuator that is affordable, lightweight, and efficient.

It's sole purpose is to tension and contract two points efficiently by using fibrous rope and injection molded plastics.

It is driven by a conventional electric motors, intended to power wearable robotics.

 

 
 

we like Powered exoskeletons

 

powered exoskeleton, is a mobile machine worn by a person, and powered by a system of hardware and software that delivers assisted or amplified movement to the limbs of a person. Or as we like to call it, the Body Amplifier

Our company is comprised of obsessed individuals with the intent of pioneering exoskeletons.

At best, exoskeletons have been hailed as the black hole of projects. They are complex, risky, dangerous, and expensive. Learning from history, that is the recipe for discovery.

And because of that, the five of us work at Rise Robotics.

 

Director  /  Arron Acosta
Technical Director  /  Blake Sessions
Product Engineer  /  Toomas Sepp
Design  /  Kyle Dell'Aquila
Efficiency Design  /  Mike Nawrot

 

 
 

The importance of Powered Exoskeletons

 

REHABILITATION

With an exoskeleton, a handicapped person is no longer restricted to using sticks or wheels for mobility, but can completely regain legged mobility.

This category of exoskeletons requires attributes of speed and control. This combination is easily achieved with a wide range of existing actuation solutions.

 

INJURY PREVENTION

With an exoskeleton that works closely with the users repetitive tasks in more discrete and assistive ways, injury prevention can help avoid strain and longterm damage.

This category of exoskeletons requires the attributes of force and control. Force is achievable for this task but at the cost of Speed making it a moderately challenging task.

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STRENGTH GAIN

With an exoskeleton that supersedes its amplification unity, it can increase the strength of the user depending on the mechanisms function.

Exoskeleton designs that focus on the overlap of the attributes of force, speed and control is the most challenging task leaving only a select few actuation options available.

 

the exoskeleton problem is an actuation problem

WEIGHT OF ACTUATORS

To address weight, we must stick strictly to light weight material choices. Minimizing high contact pressure areas allows us to avoid dense and heavy materials. Every pound saved in actuators is an extra pound in performance.

STRENGTH OF ACTUATORS

Because we with low contact pressure solutions and light weight materials (that otherwise would be focused on surface treatment), we minimize mechanical losses in moving the exoskeletons own self to maximize performance felt on the user.

COST OF ACTUATORS

Complexity of manufacturing this ideal actuator will dictate the cost of the overall mechanism. The quicker it is to iterate, the cheaper it will be to release for adoption.

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Invention of the Rope Piston

 

Out of our intentions to see exoskeletons quickly reach the market, we considered and developed an alternative approach to actuation.

By thinking strictly in methods of contact mechanics, we developed the conical differential, a cost effective way of reducing high speed rotary torque to slow linear motion through methods of rolling friction.

This insight into a new family of actuation has just begun. The Rope Pistons performance is currently competitive at most with existing solutions, but we won't settle until it is useful for our requirements in exoskeletons.

 
 
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CYCLONE ROPE PISTON BENEFITS

HIGH PERFORMANCE
The elimination of friction as a critical function of energy transfer allows for efficiencies up in the 90% range.

 

BACK DRIVABLE
The Cyclone Rope Piston can deliver power as easy as it can regenerate power on the backstroke.

LOW COST
The nature of distributed surface pressure of rope over rolling surfaces allow for the use of injection molded plastics.

 

CURRENT SENSING
For a tighter control loop, the Cyclone Rope Piston can use its back drivability to sense the amount of power required.

ELIMINATION OF CUT GEARS
The conical differential approach eliminates the need for precision machining of cut gears.

 

VARIABLE PROFILES
Depending on specific linkage designs, Profiles can be generated to counteract the necessary force with variable profiling.

Power solutions

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The way we see it, the ideal powered exoskeleton would have a minimum number of components in the path to actuation. A minimal design means minimal parts, weight and control.

Unfortunately, existing motors today are most efficient when ran at fast speeds making this ideal arrangement difficult to achieve without involving step-down transmissions.

Existing systems use compressed gasses, fluids or gears as transmission methods to step down high motor speeds to usable high torque small motion. However, most of these transmission methods have inherent inefficiencies requiring much larger batteries to compensate for wasted heat. This is where the Rope Piston family of actuators may excel as a solution.

 
 

The Cyclone Rope Piston is very good as a transmission element. It is lightweight and performs with minimal losses. The current con is that the rope piston is a little too large to place at the joints for human scale machines, so we propose using Bowden cables in series with the rope piston to bring the articulated motion to the joints while keeping the bulky pistons out of the way.

With this arrangement, transmission complexity is removed making manufacturing of an exoskeleton more of a bicycle and less of an automobile.

 
 
 
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current projects

FIBER BLOCK SPRINGS

CYCLONE ROPE PISTON

E1 EXOSKELETON KIT

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