| 摘要 |
A wheelchair base including a base frame and a pair of pivot arm assemblies each including a first pivot arm and a second pivot arm, pivotally coupled to each other for pivotal movement about a transverse pivot axis. The pivot arms defining first and second auxiliary wheel attachments opposed to the transverse pivot axis for attaching first and second end auxiliary wheels. Each pivot arm assembly including a link pivotally coupled to the second pivot arm intermediate the transverse pivot axis and the second auxiliary wheel attachment for pivotal movement about a link axis substantially parallel to the transverse pivot axis forming a drive wheel attachment intermediate the auxiliary wheel attachments. The pivot arm assemblies are mounted to the base frame substantially laterally opposed to each other through the link and first pivot arm such that the pivot arm assemblies are independently pivotable relative to the base frame.
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