초록 ▼

A wheel has a hub and a rim connected to the hub. Teeth are positioned on the outer surface of the rim and arcuately spaced one from the other by a root area. The root areas have an outer periphery and define a root diameter. The wheel has an annular opening in communication with said outer peripher

A wheel has a hub and a rim connected to the hub. Teeth are positioned on the outer surface of the rim and arcuately spaced one from the other by a root area. The root areas have an outer periphery and define a root diameter. The wheel has an annular opening in communication with said outer periphery of the root areas. A hoop having an outside diameter greater than the root diameter is positioned in the annular opening for movement in response to operation of the wheel and cleaning of material from the root areas in response to the movement.

대표청구항 ▼

In a wheel having a hub, a rim having an outer surface and being connected to the hub, and teeth being positioned about the outer surface of the rim and being arcuately spaced one from the other by a root area, said root areas having an outer periphery and defining a root diameter, the improvement c

In a wheel having a hub, a rim having an outer surface and being connected to the hub, and teeth being positioned about the outer surface of the rim and being arcuately spaced one from the other by a root area, said root areas having an outer periphery and defining a root diameter, the improvement comprising: said wheel having an annular opening having an inner diameter and an inner surface and being in communication with the outer periphery of the root areas, said inner diameter being less than the root diameter; and a hoop having inner and outer diameters and being positioned in the annular opening and free from connection with the wheel, said inner and outer diameters being greater than the inner diameter of said annular opening and the root diameter, respectively.