Patent ID: 8570030
Filing Date: 2013-10-29
Classification: G01N

Abstract:
1. A wear sensor comprising in combination: an elongated magnet having a first length along a long dimension thereof, a first long flat side and an opposing second, long flat side; a first magnetically permeable material having a second length and a flat side disposed alongside the first long flat side of said magnet; a second magnetically permeable material having a third length and a flat side disposed alongside the second long flat side of said magnet, wherein the second length and the third length are greater than the first length, forming thereby a closed end and an air gap between said first magnetically permeable material and said second magnetically permeable material at the opposing end; and means for measuring the magnetic field within the air gap; whereby the magnetic field in the air gap decreases as said magnet, said first material and said second material are worn away at the closed end.