Patent ID: 7093505

Claim:
In combination with a mounting surface out of which a threaded hole opens and with a target which rotates in front of the surface about an axis that is oriented at a steep angle with respect to the surface, and with a screw having a threaded shank that threads into the hole and a head at the end of the shank; a sensor for monitoring the rotation of the target; said sensor comprising: a housing located along the mounting surface and having a slot that is aligned with the threaded hole, the housing along the slot being formed from a deformable material and containing a permanent indentation that receives a portion of the screw, the indentation having been formed by the screw itself and being of a configuration that prevents displacement of the slot along the screw when the portion of the screw is in the indentation; and a sensing element located in the housing and being capable, in response to rotation of the target, of producing a signal that reflects the angular velocity of the target; whereby the sensor, should it be removed from the mounting surface by withdrawing the screw from the threaded hole, may be reinstalled in the same position by again threading the screw into the hole such that the portion of it is received in the indentation.