Patent ID: 7082806
Filing Date: 2006-08-01
Classification: B21D

Abstract:
1. A method of manufacturing a diaphragm backing plate for use in a brake booster comprising the steps of: moving a coil of metal to a first station, said coil having a first and second sides to define a first width; applying a force to remove a section from the roll of metal to create a first plate defined by a peripheral surface having equal and parallel sides connected to each other by an arcuate segment each of which has a radius that is approximately equal to one-half of the width of the coil plus a minimum width of a desired peripheral lip for the diaphragm backing plate and wherein each parallel side is located at an equal distance from the center of the first plate along a X coordinate in a Y coordinate that is defined by a point where the radius intersects the Y coordinate; punching a pilot hole in the center of the first plate; moving the first plate to a second station where the parallel sides and pilot hole retain the alignment therein; and thereafter rolling the peripheral surface on said first plate to define a uniform diameter for a resulting second plate with the desired peripheral lip having a uniform circumference, said uniform diameter for the second plate being approximately equal to the width of said coil less twice minimum width for said lip while said lip has a scalloped surface with radially inwardly directed circular segments.