Patent ID: RE40505

Claim:
A rumble strip milling machine comprising: a vehicle movable along a road surface; a cutting head rotatably mounted in associated with said vehicle and mounted for alternating up and down movement into and out of said road surface while said cutting head is rotating , said cutting head comprising: a drum having opposed ends and a center rotational axis extending between said opposed ends, said drum having a convex outer surface in a direction along said center rotational axis; a shaft extending from said opposed ends of said drum along said center rotational axis; and a plurality of milling elements positioned on said outer surface of the drum and having cutting surfaces positioned to define a plane curve as said drum is rotated about said center rotational axis, said plane curve having a transverse diameter taken in a plane transverse to said center rotational axis, said transverse diameter of the plane curve being greatest in a first region and of reduced dimension in regions on opposite sides of said first region; and a motor coupled with said shaft of the cutting head for effecting rotation thereof.