Patent ID: 7309109

Claim:
A wheel assembly comprising: an axle including a shaft, the shaft including a bore extending along a longitudinal axis of the axle shaft; an external thread formed on the axle shaft; a wheel mounted on the axle shaft; a nut threadedly engaging the external thread of the axle shaft for retaining the wheel on the shaft; and an axle extension assembly for extending the axle shaft, the axle extension including a shaft including an axle bore insert portion adapted for insertion in the longitudinal axle bore, the axle bore insert portion including a bore engaging element cooperative between the axle bore insert portion and the longitudinal axle bore for securing axle bore insert portion within the longitudinal axle bore, the shaft also including an extension portion connected to and extending from the axle bore insert portion of the shaft, the extension portion including an accessory engaging element; and a wheel assembly accessory attached to the extension portion by the accessory engaging element.