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Gyroscopic exercise tool

From WikID

[[Has main image::Gyrotwister.jpg|]] Product domains

A gyroscopic exercise tool is a device used to exercise the wrist as part of physical therapy or in order to build hand and finger strength. It can also be used as a clever demonstration of some aspects of rotational dynamics. The device consists of a tennis ball-sized plastic or metal shell around a free-spinning mass, which can be started with a short rip string or by a snap of the thumb. Once the gyroscope inside is going fast enough, a person holding the device can accelerate the spinning mass to high revolution rates by moving the wrist in a circular motion.

Contents

  • 1 History
  • 2 Subdivision
  • 3 Operation
  • 4 Functioning
  • 5 Usage
  • 6 Competitive products
  • 7 Standards
  • 8 Recent patents
  • 9 References

History

Please focus on recent predecessors and development.

Subdivision

Names under which gyroscopic exercise tools are sold include DynaBee and Powerball. DynaBee has been a brand name since the 1970s for gyroscopic wrist exercisers.

Powerball is a trademarked name for gyroscopic exercise devices produced by Nanosecond (NSD). Later patents for the Powerball device cover its extra features such as revolution counters and gyro-powered LED lights. The light-emitting diodes are powered by a small generator embedded in the gyroscope. Even the regular NSD Powerball includes the magnet needed to make the revolution counters work.

Other Powerball models on the market today are the “Powerball 350Hz Metal” and “NSD SuperPowerBall” (these powerballs are made primarily of metal and have twice the weight of “regular” Powerball models and are more challenging to operate since up to 250Nm of torque is produced); the “Powerball Signature” (featuring a more stable rotor); and the “Powerball Screamer” (based on the Powerball 250Hz model, but with 8 holes drilled in the rotor to generate a very loud sound).

Nanosecond’s Powerball was the first to feature electronic revolution counters and a generator for light-emitting diodes.

Another powerball brand is the Powerball-the Original that is manufactured by Kernpower Company in Taiwan. Kernpower also is unique by its first metallic gyroscopic exercise tool in the world that is branded by the brand IronPower.

Operation

How to use the product.

Functioning

The device essentially consists of a spinning mass inside an outer shell. The shell almost completely covers the mass inside, with only a small round opening allowing the gyroscope to be manually started. The spinning mass is fixed to a thin metal axle, each end of which is trapped in a circular, equatorial groove in the outer shell. A lightweight ring with two notches in it for the ends of the axle rests in the groove. This ring can slip in the groove; it holds the spinning gyroscope centered in the shell, preventing the two from coming into contact (which would slow the gyro down), but still allowing the orientation of the axle to change. Once the gyroscope is spinning, tipping the device causes the gyroscope to precess, with its axle slipping around in the groove in a circular fashion. The groove inside the device is a little wider than the axle; an externally applied torque causes one end of the axle to push against the upper rim of the groove, while the other end pushes against the lower rim of the groove. These two effects combine to make the device work: as the gyroscope precesses in response to an external torque, one end of the axle “rolls” along the top edge of the groove while the other end “rolls” along the bottom edge, speeding up the rotation of the spinning mass.

Usage

The context in which the product is used.

Competitive products

Including benefits and limitations of different products.

Standards

Please add standards per geographic region.

Gyroscopic exercise tool From WikID [[Has main image::Gyrotwister.jpg|]] Product domains A gyroscopic exercise tool is a device used to exercise the wrist as part of physical therapy or in

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