Patent ID: 7272969

Claim:
An apparatus for testing abrasion comprising: a sample holder for holding a test specimen; a pressing means to generate frictional wear between a surface of the pressing means and a surface of the test specimen; and a drive unit coupled to the pressing means, where the drive unit effects movement of the pressing means along a plane on the surface of the test specimen while the pressing means applies a given pressing force to the test specimen, wherein the pressing means is a cam having an axis of rotation and a surface located a distance (d) from the axis of rotation, the cam characterized by having: a minimum distance (d 1 ) from the axis of rotation to a point on the surface of the cam and a maximum distance (d 2 ) from the axis of rotation to a point on the surface of the cam, the axis of rotation positioned a given distance (L) from the surface of the test specimen, wherein d 1 <L<d 2 , the cam being rotated by the drive unit about the axis of rotation and intermittently coming into direct contact with the test specimen when L is less than or equal to (d), and controlled to press against the test specimen in such a way that a maximum pressing force is fixed; and wherein the sample holder, by means of an elastic member coupled thereto, allows the test specimen to be displaced with respect to the pressing means in response to the pressing force applied to the test specimen.