초록 ▼

For measuring the tread depth of the tyre of a motor vehicle by means of a measuring head containing a laser (67), the laser measuring head is positioned relative to the tyre of the motor vehicle in such a way, that a reference surface or plane adopts a well-defined position with respect to the tyre

For measuring the tread depth of the tyre of a motor vehicle by means of a measuring head containing a laser (67), the laser measuring head is positioned relative to the tyre of the motor vehicle in such a way, that a reference surface or plane adopts a well-defined position with respect to the tyre. The laser beam (66) of the laser (67) is directed through the reference surface (68) at an angle (.alpha.) to the bottom (64) of the tyre tread, whereby a light spot (78) is generated on this bottom (64) of the tyre tread. The position (e) of the light spot (78) is observed by an image resolving sensor (82). Therefrom, a measure (t) of the depth of the tyre tread is gained.

대표청구항 ▼

[ I claim:] [1.] A measuring device for measuring the tread depth of a motor vehicle tyre comprising:(a) a laser for generating a laser beam, which is directed to the tread surface of the motor vehicle tyre to generate a light spot thereon;(b) an image resolving sensor arranged to observe the positi

[ I claim:] [1.] A measuring device for measuring the tread depth of a motor vehicle tyre comprising:(a) a laser for generating a laser beam, which is directed to the tread surface of the motor vehicle tyre to generate a light spot thereon;(b) an image resolving sensor arranged to observe the position of the light spot;(c) signal processing means designed to generate, from position data, a measured value indicative of the tread depth of one or more tread grooves of the tyre tread; racterized in that:(d) the laser and the image resolving sensor are accommodated within a common housing to provide a laser measuring head;(e) the laser measuring head having an engagement surface permitting the laser measuring head to be brought into engagement with the motor vehicle tyre, whereby the laser and the image resolving sensor are positioned in a well-defined position relative to the motor vehicle tyre;(f) the laser and the image resolving sensor are fixedly arranged relative to the engagement surface; and(g) the measuring head including the laser, the image resolving sensor and the engagement surface defines a manually portable unit, the laser measuring head of which is capable of being swept manually over the tyre tread.