Gearwheel Ab

Nils Didner

Lars Tenerz

Fredrik Preinitz

Dan Åkerfeldt

A wheel assembly comprising a wheelchair wheel () and a backstop arrangement () configured to selectively engage and disengage a backstop function and comprising a backstop selector () and a backstop member (), wherein the wheel () comprises an internal-gear wheel hub () comprising a number of internal gears () and having an inner rotatable circumferential surface (), and wherein the backstop member is configured to allow the inner circumferential surface to rotate in one direction and to prevent rotation in the opposite direction. The wheel assembly comprises further a gear-shift arrangement comprising a shift member (), which is axially moveable within the internal-gear hub () to engage a specific gear of said number of internal gears (), and wherein the shift member () via a connector member () is operatively connected to the backstop selector.

Backstop and gear-shift arrangement for a wheelchair wheel

A wheel assembly comprising a wheel () for a wheelchair (), a gripping ring () connected to the wheel, and a gear-shift arrangement (); the wheel being provided with a wheel axle (); the gear-shift arrangement being configured to change a gear ratio between the wheel and the gripping ring; the gear-shift arrangement comprising an internal-gear hub () comprising a number of internal gears (), a shift member (), and a gear selector () located on the same side of the wheel as the gripping ring, wherein the gear selector is operatively connected to the shift member () that is axially moveable within the internal-gear hub to engage a specific gear of said number of internal gears, and that the gear selector has an inner base portion () and an outer handle portion () and extends radially away from the wheel axle.

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Uppsala, Sweden

Nils Didner