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Walking frames have two front wheels, and there are also wheeled walkers available having three or four wheels, also known as rollators. Walkers started appearing in the early 1950s. The first US patent was awarded in 1953 to William Cribbes Robb, of Stretford, UK, for a device called "walking aid", which had been filed with the British patent ...
The addition of geared, all-mechanical wheels for manual wheelchairs is a new development incorporating a hypocycloidal reduction gear into the wheel design. The 2-gear wheels can be added to a manual wheelchair. The geared wheels provide a user with additional assistance by providing leverage through gearing (like a bicycle, not a motor).
A walker (also known as a Zimmer frame) is the most stable walking aid and consists of a freestanding metal framework with three or more points of contact which the user places in front of them and then grips during movement. The points of contact may be either fixed rubber ferrules as with crutches and canes, or wheels, or a combination of both.
Three-wheel walkers: This type of walker will have three wheels with two in the back and one upfront. They can be lighter and easy to use inside houses and handy in tight spaces.
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Mary Beatrice Davidson Kenner (May 17, 1912 – January 13, 2006) was an American inventor most noted for her development of the adjustable sanitary belt. [1] Kenner received five patents, which includes a carrier attachment for invalid walker and bathroom tissue dispenser.
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