Patent ID: 6206119
Filing Date: 2001-03-27
Classification: A61G,B60G,Y10S

Abstract:
A wheelchair comprising:a chassis on which a seat is mounted, the chassis having a double-framed structure comprising a primary frame and a secondary frame pivotally attached to each other by a first pivot means so that both the primary frame and the secondary frame are rotatable about a first rotational axis of the first pivot means, two driving wheels being mounted to the primary frame and independently driven by motors, the secondary frame having a front edge frontward extending beyond the primary frame with two front guide wheels mounted thereto, the front guide wheels and the driving wheels being pivotable about the first rotational axis by means of the first pivot means so as to provide surface compliance of the front guide wheels and the driving wheels when moving on an uneven surface; whereina first rotation limiting means is provided between the primary and secondary frames for limiting angular displacement of the secondary frame with respect to the primary frame about the first rotational axis, and the first rotation limiting means comprises a first limiting bolt mounted to the primary frame with a free end thereof spaced from the secondary frame a first distance, whereby when the secondary frame is rotated with respect to the primary frame an angular displacement corresponding to the first distance, the secondary frame contacts the free end of the first limiting bolt, such that further rotation of the secondary frame is prohibited.