초록 ▼

A vertical foldable wheelchair (10) having a pair of side frame assemblies (11, 11′) each including frame members coupled together for selective movement of the side frame assemblies (11, 11′) between a vertically extended deployed condition and a relatively vertically compact collapsed condition. T

A vertical foldable wheelchair (10) having a pair of side frame assemblies (11, 11′) each including frame members coupled together for selective movement of the side frame assemblies (11, 11′) between a vertically extended deployed condition and a relatively vertically compact collapsed condition. The frame members are coupled together to provide a bi-stable, over-center, linkage assembly (13, 13′) which is movable between and biased toward both of: (i) a first stable position on one side of a linkage assembly centerline when the side frame assemblies (11, 11′) are in the deployed condition; and (ii) a second stable position on an opposite side of the centerline when the side frame assemblies (11, 11′) are in the collapsed condition.

대표청구항 ▼

A vertically foldable frame for a lightweight wheelchair comprising: a pair of side frame assemblies connected together as a unit by at least one cross-frame member; said side frame assemblies each having frame members coupled together for selective movement of said side frame assemblies between a v

A vertically foldable frame for a lightweight wheelchair comprising: a pair of side frame assemblies connected together as a unit by at least one cross-frame member; said side frame assemblies each having frame members coupled together for selective movement of said side frame assemblies between a vertically extended deployed condition and a relatively vertically compact collapsed condition; at least one of said side frame assemblies having frame members pivotally coupled together to provide a bi-stable, over-center, linkage assembly movable between and biased toward both of: (i) a first stable position on one side of a linkage assembly centerline when said side frame assemblies are in said deployed condition; and (ii) a second stable position on an opposite side of said centerline when said side frame assemblies are in said collapsed condition; and a biasing structure cooperating with said linkage assembly and being sufficiently resilient to retain said linkage assembly in said first stable position when said linkage assembly is positioned on the one side of the centerline, and biasing said linkage assembly toward said second stable positioned when positioned on the opposite side of the centerline.