Throw-away tip with abrasion sensor

Abstract

For a throw-away tip provided with a sensor line of a conductive film, no technique has been established for connecting the sensor line to an external detection circuit and the like without any trouble. A throw-away tip 71 generally has an inward side face 88 and a rear side face 89 which are respectively restricted by an inward restriction face 95 and a rear restriction face 94 of a holder 92 for prevention of wobble and displacement of the throw-away tip 71 when the throw-away tip 71 is mounted in the holder 92. The inward side face 88 and the rear side face 89 are brought into abutment or intimate contact with the inward restriction face 95 and the rear restriction face 94, respectively. Therefore, the side faces (restricted faces) 88, 89 of the tip are not exposed but protected by the restriction faces 95, 94 of the holder with the tip being attached to the holder. In the light of the nature of the restricted faces, contact regions 83, 84 necessary for connection of a sensor line 82 to a detection circuit 99 and the like are provided on the side faces 88, 89 which are protected by the restriction faces 95, 94 when the tip is attached to the holder. Thus, a throw-away tip can be provided which has a configuration ensuring proper electrical connection of the sensor line. (FIG. 1)

Dependencies are inferred from the claim text.