A foldable wheelchair, which may be moved along a predetermined direction of movement, includes first and second side frames, drive wheels and travelling wheels rotatably supported on the side frames, and a folding mechanism which extends between the side frames, which can be moved between a folded
A foldable wheelchair, which may be moved along a predetermined direction of movement, includes first and second side frames, drive wheels and travelling wheels rotatably supported on the side frames, and a folding mechanism which extends between the side frames, which can be moved between a folded position and an unfolded position, and which, in turn, includes first and second pivoting devices. Each pivoting device may be pivoted about a respective center axis, which extends approximately along the direction of movement, and each pivoting device has ends facing away from its respective center axis. Each side frame defines first and second pivot axes, which extend substantially parallel to the center axes. The ends of the first pivoting device are pivotable about corresponding of the first pivot axes, and the ends of the second pivoting device are pivotable about corresponding of the second pivot axes. The center axis of the first pivoting device, and the first pivot axes are substantially aligned in a first plane, and the center axis of the second pivoting device, and the second pivot axes are substantially aligned in a second plane, when the folding mechanism is in the unfolded position. The pivoting devices may be arrested in the unfolded position, thereby rigidly connecting the side frames to one another.
대표청구항▼
A foldable wheelchair movable along a predetermined direction of movement, comprising in combination first and second side frames, drive wheels and travelling wheels rotatably supported on said side frames, and folding means extending between said side frames, movable between a folded position and a
A foldable wheelchair movable along a predetermined direction of movement, comprising in combination first and second side frames, drive wheels and travelling wheels rotatably supported on said side frames, and folding means extending between said side frames, movable between a folded position and an unfolded position, and including first and second pivoting means, said first and second pivoting means each including two rods, said rods of said first pivoting means being substantially U-shaped, said rods of said first and second pivoting means being pivotable towards one another in a scissor-like manner about a respective center axis extending approximately along said direction of movement, each pivoting means having ends facing away from its respective center axis, and at least one stop means operative in the unfolded position of said folding means, said stop means being encountered by at least one of said rods, said stop means including at least one crossbar secured to both sides of one rod at an end thereof remote from said respective center axis so as to abut in the unfolded position of said folding means onto the other of said rods, each side frame defining first and second pivot axes, extending substantially parallel to said center axes, the ends of said first pivoting means being pivotable about corresponding of said first pivot axes, and the ends of said second pivoting means being pivotable about corresponding of said second pivot axes, said center axis of said first pivoting means and said first pivot axes being substantially aligned in a first plane, said center axis of said second pivoting means and said second pivot axes being substantially aligned in a second plane when said folding means is in said unfolded position, said pivoting means being arrestable in said unfolded position, thereby rigidly connecting said side frames to one another.
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이 특허에 인용된 특허 (1)
Minnebraker Jeffrey P. (Westlake Village CA), Wheel assemblies for use with wheelchairs.
Hector, Jr., Melvin G.; Yentzer, Dana R., Structure, components and method for constructing and operating an automatically self locking manually propelled vehicle such as a wheel chair.
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