Patent ID: 9101520
Filing Date: 2015-08-11
Classification: A61G,B62M

Abstract:
1. A manually propelled standing wheelchair comprising: a chassis having a front portion, a rear portion, a center portion, a left portion, a right portion, a top portion, and a bottom portion; at least two ground drive wheels, one of said two ground drive wheels being disposed on said left portion of said chassis, and one of said two ground drive wheels being disposed on said right portion of said chassis; a rotating structure, comprising a left rotating structure and a right rotating structure, wherein each of said left rotating structure and said right rotating structure is attached, respectively, to said left portion and said right portion of said chassis; an adjustment actuator for raising and lowering at least a portion of said chassis between a seated position and a standing position and any intermediate positions therebetween; at least two user propulsion wheels, each laterally outset relative to said chassis and affixed proximate to said rotating structure, one of said at least two user propulsion wheels being rotatably affixed to said left rotating structure, and one of said at least two user propulsion wheels being rotatably affixed to said right rotating structure; a linkage system connecting one of said at least two user propulsion wheels with one of said two ground drive wheels at said left portion of said chassis, and another linkage system connecting one of said at least two user propulsion wheels with one of said two ground drive wheels at said right portion of said chassis; directional support wheels rotatably affixed to a foot rest which is affixed to a frontal extension disposed at said front portion of said chassis, wherein said directional support wheels include a caster structure for affixment of said directional support wheels to said foot rest, and said frontal extension retracts said foot rest and said directional support wheels off the ground during seated operation, and lowers said foot rest and said direction support wheels to contact the ground during standing operation; a set of stabilizing rear wheels situated structurally opposite said directional support wheels; and wherein each said at least two ground drive wheels is rotatably affixed to said center portion of said chassis, respectively, adjacent said left portion and said right portion between said directional support wheels and said stabilizing rear wheels, as a means for maintaining a stable center of gravity of said wheelchair at said center portion of said chassis and for focusing a locus of force at each said ground drive wheels at said center portion of said chassis during both seated operation and standing operation.