Patent ID: 6378350
Filing Date: 2002-04-30
Classification: B21C,B21D,B21K,B60R,Y10T

Abstract:
A method of manufacturing a seat belt anchorage plate with a sheet metal base (2) having a first surface (22a) and a second surface (22b) on the reverse side of the first surface (22a), comprising the steps of:forming a protruding portion (23) which protrudes from the second surface (22b) in a first direction from the first surface (22a) side to the second surface (22b) side by a drawing process of press-working, so that a curved surface (R1) is formed which is curved in a circular arc shape from the first surface (22a) to an inner surface of the protruding portion (23); punching out a bottom of the protruding portion (23) so as to form a slot (6) which is composed of a first long edge (691-2), a second long edge (692-2) opposed to the first long edge (691-2) and short edges (7) connecting the first and second long edges (691-2, 692-2); folding back an end part of the protruding portion (23) by curling process of press-working so that the end part of the protruding portion (23) comes close to the second surface (22b) of the sheet metal (2), thereby forming a first protrusion (611-2); wherein the first protrusion (611-2) has a curved surface (R2) which is smoothly curled from the inner surface of the slot (6) to the first protrusion (611-2).