Seat belt buckle device

A seat belt buckle apparatus comprising:

• a buckle to which a tongue is detachably coupled;
• a strap coupled to a lower portion of the buckle and rotatably mounted to a seat frame to rotate in a forward and backward direction;
• a bracket disposed on one side of the strap and fixed to the seat frame to limit a rotation angle of the strap;
• and
• a torsion spring providing a restoring force such that the strap is positioned upward,
• wherein the strap is formed with a through hole into which a mounting bolt is coupled to the seat frame is fastened, and an adjustment hole into which an adjustment protrusion is formed in the bracket is inserted,
• wherein the adjustment protrusion is configured to be bent toward the strap at a lower end of the bracket,
• wherein the adjustment protrusion is provided with a protective member that covers the adjustment protrusion and is configured to be bent in order to prevent noise and scratch by covering an entire contact area between the strap and the bracket when the strap is rotated,
• wherein a strap bush is coupled to the through hole,
• wherein the mounting bolt is coupled to the through hole of the strap in a state in which the torsion spring and a bush are installed on an outer peripheral surface of the mounting bolt,
• wherein the bush is formed on an outer peripheral surface thereof with a first step and a second step, which are configured to have a stepped surface, in which the torsion A spring is coupled to the first step and supported thereon, and the strap bush is coupled to the second step of the bush,
• the bush and the strap bush are manufactured by using mutually different materials to prevent noise and damage generated during rotation of the strap.