Foldable tiltable wheelchair and frame therefor

A foldable tiltable wheelchair that overcomes the foregoing deficiencies comprises a base frame comprising laterally spaced side frames. A tiltable seat frame is supported for pivotal movement in relation to the base frame. The tiltable seat frame comprises laterally spaced seat rails. A first foldable cross-member provides a rigid connection between the seat rails when in an unfolded position. According to one embodiment, a second foldable cross-member provides a rigid connection between the side frames when in an unfolded position. The first and second foldable cross-members coupled so that moving one cross-member moves the other cross-member. According to another embodiment, the tiltable seat frame comprises a seat back supported in relation to the seat frame. The seat back comprises laterally spaced back canes. The first foldable cross-member is coupled to the seat frame so that the back canes are supported in relation to the first foldable cross-member so as to limit lateral flexure of the back canes. The first foldable cross-member is foldable to a folded position to fold the wheelchair.