| 摘要 |
<p>A wheel for use on lawns or similar surfaces, particularly as a drive wheel for an autonomous ("robot") lawn mower, said wheel having a tread pattern on its outer generally circumferential surface, comprising a succession of upstanding treads extending generally parallel to the axis of the wheel and an upstanding rib in a plane intermediate opposite sides of the wheel extending outwardly so the its outer circumferential edge has a radius from the wheel axis substantially the same as the maximum radius of the treads of the tread pattern, said rib, in use, reducing side slip of the lawn care apparatus when working on a slope. The sidewalls of adjacent upstanding treads extend in a continuous curved line between them to define a channel between the adjacent upstanding treads. This reduces clogging of the tread. The wheel is made by moulding an inner core, providing a generally circular cap to engage with the side surface of the inner core, engaging the inner core and circular cap to form an assembly, and moulding a surface over the circumferential outer surface and at least part of said side surface of the assembly so as to cover a joint between the inner core and the circular cap to permanently engage them.</p> |
