Apparatus for testing tire tread depth

Details Apparatus for testing tire tread depth Apparatus for testing tire tread depth

1998-03-16

1999-11-23

Felber, Joseph L.

Measuring and testing

Tire, tread or roadway

Tire inflation testing installation

G01M 1702

Patent

active

059879785

ABSTRACT:
An apparatus for determining the depth of a tire tread includes a radiation source for illuminating the tread of a tire, the direction of the illumination being non-normal with respect to the local surface of a portion of a tire under inspection, at least one detector responsive to radiation reflected from the tire, and a data processor responsive to the at least one detector for calculating the tread depth. In one embodiment, differences in displacement between radiation reflected from the top surface of a tread and radiation reflected from the bottom surface of a tread are measured to determine tread depth. In a second embodiment, the shadow cast by the top surface of the tread over the bottom surface of the tread is measured to determine tread depth. A third embodiment employs a sheet of radiation with varying wavelength to determine the tread depth.

REFERENCES:
patent: 3918816 (1975-11-01), Foster et al.
patent: 4095464 (1978-06-01), Breedijk
patent: 5801304 (1998-09-01), Cantu et al.

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