| 摘要 |
<p>The wheelchair (10) comprises: - a main frame (12); - a pair of drive wheels (18) affixed to and supporting said main frame (12); - a pair of caster wheels (16) each pivotally mounted to and supporting said main frame (12); - a seat frame (20) connected to the main frame (12) via a left and a right rear linkage arms (60), said left, respectively said right, rear linkage arm (60) having one first end pivotally connected to the main frame (12) at a first pivot point (58) and one second end pivotally connected to the seat frame (20) at a second pivot point (62); - a seat plate (24) supported by the seat frame (20) and defined by rear and front sides and left and right sides; - a backrest frame (22) connected to the seat frame; - two guide rollers (67) rotary arranged along a laterally oriented shaft (66), said shaft being connected to the main frame (12) and said left, respectively said right, guide roller (67) being received in and guided by a left, respectively a right, guide slot (69) arranged in the seat frame (20). The rear linkage arms (60) and the guide slots (69) are configured such that the virtual pivot point around which pivots the seat frame (20) moves rearward when the seat frame (20) moves from an upright position to a tilted position.</p> |
