WHEELCHAIR INCLUDING A TILTABLE SEAT

摘要

An exemplary wheelchair comprises a main frame and a seat frame. Drive wheels and pivoting caster wheels are affixed to and support the main frame. The seat frame is connected to the main frame via left and right rear linkage arms, each rear linkage arm having a first end pivotally connected to the main frame and a second end pivotally connected to the seat frame, thereby allowing the seat frame to pivot relative to the main frame around a virtual pivot point. A seat plate having right, left, front, and rear sides is supported by the seat frame. A backrest frame is also connected to the seat frame. Left and right guide slots of the seat frame receive left and right guide rollers rotationally arranged at each end of a laterally oriented shaft connected to the main frame. The rear linkage arms and guide slots are configured so the virtual pivot point of the seat frame moves rearward when the seat frame is moved from an upright position to a tilted position.

主权项

1. A wheelchair comprising:
a main frame; a pair of drive wheels affixed to and supporting said main frame; a pair of caster wheels each pivotally mounted to and supporting said main frame; a seat frame connected to the main frame via a left and a right rear linkage arms, said left, respectively said right, rear linkage arm having one first end pivotally connected to the main frame at a first pivot point and one second end pivotally connected to the seat frame at a second pivot point; a seat plate supported by the seat frame and defined by rear and front sides and left and right sides; a backrest frame connected to the seat frame; two guide rollers rotary arranged along a laterally oriented shaft, said shaft being connected to the main frame and said left, respectively said right, guide roller being received in and guided by a left, respectively a right, guide slot arranged in the seat frame; wherein the rear linkage arms and the guide slots are configured such that the virtual pivot point around which pivots the seat frame moves rearward when the seat frame moves from an upright position to a tilted position.