| 摘要 |
A foot-operated propulsion apparatus for a wheelchair and/or other selected devices such as desk chairs and furniture. In one embodiment, the apparatus includes a support structure coupled to the selected device and having at least one roller aperture. A roller element having a circular cross-sectional shape is received in the roller aperture and is rotatable relative to the support structure about a rotation axis or a plurality of rotation axes. The roller element has a first external portion projecting upwardly from the aperture to engage the user's foot and a second external surface portion projecting downwardly through the aperture to engage the ground or other support surface. As the user engages the roller element and rotates the element by foot, the propulsion apparatus and the device to which it is coupled move along the ground. The user can directly engage the roller element or can engage a brake device coupled to the roller element to slow the propulsion device.
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