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Some wheelchairs are designed for general everyday use, others for single activities, or to address specific access needs.Innovation within the wheelchair industry is relatively common, but many innovations ultimately fall by the wayside, either from over-specialization, or from failing to come to market at an accessible price-point.when an unknown inventor from Spain built one for King Phillip II.Although it was an elaborate chair having both armrests and leg rests, the design still had shortcomings since it did not feature an efficient propulsion mechanism and thus, requires assistance to propel it.These shock absorbers may be added to the front wheels, to the rear wheels, or both.Rigid chairs also have the option for their rear wheels to have a camber, or tilt, which angles the tops of the wheels in toward the chair.
Everest had previously broken his back in a mining accident.
There will generally also be a separate seat cushion.
The larger rear wheels usually have push-rims of slightly smaller diameter projecting just beyond the tyre; these allow the user to manouevre the chair by pushing on them without requiring them to grasp the tyres.
A wheelchair, often abbreviated to just "chair", is a chair with wheels, used when walking is difficult or impossible due to illness, injury, or disability.
Wheelchairs come in a wide variety of formats to meet the specific needs of their users.