| 摘要 |
A wheelchair footrest is provided having a footrest support member and a socket receptacle connected thereto. A swivel element is adjustably received for rotation within the socket receptacle. A foot plate is connected to the swivel element by a foot plate support member. The position of the swivel element is rotatably adjustable relative to the socket receptacle in yaw, pitch and roll directions. The swivel element has a socket engaging surface forming a portion of a sphere and the socket receptacle has an interior surface sized and shaped to mate with the socket engaging surface. The socket receptacle and the swivel element are fabricated from ferrous metals, and at least the interior surface of the socket receptacle and the socket engaging surface of the swivel element are subjected to a ferritic nitrocarburization surface treatment process.
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