Patent ID: 7699131
Filing Date: 2010-04-20
Classification: A61G,Y10S

Abstract:
1. An electric foldable wheelchair comprising: a chair assembly including a seat, a first frame, a second frame, and a third frame, the seat being pivotally connected to the second frame, the second frame being pivotally connected to the first frame, the first frame being pivotally connected to the third frame, the third frame being pivotally connected to the seat, the seat, the first frame, the second frame, and the third frame cooperating with each other to form a four-bar linkage mechanism that enable the chair assembly to have a same-directional folding path; and a wheel assembly including two drive wheels mounted at a bottom of the third frame of the chair assembly, and the folding path of the chair assembly being vertical to an axis of the drive wheels of the wheel assembly; a first pivot point is disposed at one end of each of two opposite sides of the seat, disposed beside the first pivot point is a second pivot point, a first pivot portion and a second pivot portion are disposed at both ends of the first frame, respectively, a third pivot point is located at a center of one side of the second frame, and beside the third pivot point is a fourth pivot point, a first connecting portion is located at one end of the second frame, and an abutting portion is formed at the other end of the second frame, the third pivot point of the second frame is pivotally connected to the second pivot point of the seat, the fourth pivot point of the second frame is pivotally connected to the second pivot portion of the first frame, a third pivot portion is arranged at one end of the third frame, a fourth pivot portion is located beside the third pivot portion, and a second connecting portion is located at the other end of the third frame, the third pivot portion of the third frame is pivotally connected to the first pivot portion of the first frame, and the fourth pivot portion of the third frame is pivotally connected to the first pivot point of the seat, the wheel assembly further includes two front wheels and two auxiliary rear wheels, each of the front wheels has a third connecting portion to be connected to the first connecting portion of the second frame, each of the drive wheels is provided with a fourth connecting portion, and each of the auxiliary rear wheels is also provided with a fifth connecting portion, an axis of the auxiliary rear wheels is parallel to that of the drive wheels, the fifth connecting portion of the auxiliary rear wheels is connected to a lower end of the fourth connecting portion of the drive wheels, and an upper end of the fourth connecting portion of the drive wheels is detachably connected to the second connecting portion of the third frame.