초록

The surface appearance of a tire tread finished by grinding to alleviate force variations in the tire is improved by reversing the grinding mode of one of the usual two grinding wheels. The effect is particularly useful in tires having large open block pattern treads as in mud and snow tires.

대표청구항 ▼

In a process for grinding arcuate portions of the tread of an inflated pneumatic tire near the lateral edge or edges of such tread to reduce variations in force exerted by such tire on the surface of a load measuring wheel, and in which process the tire is mounted and inflated on a power driven rota

In a process for grinding arcuate portions of the tread of an inflated pneumatic tire near the lateral edge or edges of such tread to reduce variations in force exerted by such tire on the surface of a load measuring wheel, and in which process the tire is mounted and inflated on a power driven rotating chuck in a machine having a fully rotatable load measuring wheel for engaging the tread of the tire in loaded rolling contact and two grinding wheels driven at grinding speed to remove material from said arcuate portions engageable and disengageable with said portions in response to variations in load exerted on said wheel by said tire; the improvement comprising: driving each of said grinding wheels in a rotational sense opposite to the rotational sense of the other of said grinding wheels, such that one of said grinding wheels while engaged in material removing contact with the rotating tire cuts in an up-grinding mode and the other of said grinding wheels while engaged in material removing contact with the rotating tire cuts in a down grinding mode whereby the surface appearance of the tread of the tire is improved relative to the appearance thereof by rotating both said grinding wheels in a usual common directional sense.