Patent ID: 7249483
Filing Date: 2007-07-31
Classification: B21J,F16D

Abstract:
1. A method for making a backing plate for a friction assembly, The method comprising steps of: pressing, against a first surface of a backing plate material, an extrusion tool having an extrusion edge with a curved shoulder above the extrusion edge; guiding the extrusion tool at an angle from the first surface towards a second surface of the backing plate material opposite to the first surface for a first distance, and then generally parallel to the first surface of the backing plate material for a second distance to create a groove having a bottom wall that has an inclined section and a flat section; and extruding, while guiding the extrusion tool, a portion of the backing plate material to form a retention member which comprises a protrusion having a curved end formed along the curved shoulder of the extrusion tool, such that the protrusion is adjacent to the groove, and the protrusion has a thickness that is substantially larger at a proximal end than at the curved end and the thickness of the protrusion adjacent the proximal end is larger than the depth of the generally flat section of the groove, and the curved end of the protrusion is curved away from the associated groove to define a longer convex wall and a shorter concave wall between the proximal end and the curved end so that the protrusion presents a distorted semi-triangular cross-section with the curved end curved above the distorted semi-triangular cross-section.