Seat back suspension assembly for vehicle and method of manufacturing the same

A method of manufacturing a seat back suspension assembly for a vehicle, comprising:

• preparing a wire part comprising a main wire comprising side wires extending in a vertical direction at left and right side thereof, at least one first support wire extending in a horizontal direction between the side wires at first and second sides thereof to allow contact parts of first and second ends thereof to contact the side wires, and at least one second support wire disposed to be spaced from the at least one first support wire and extending in a horizontal direction between the side wires at the first and second sides thereof to allow curved parts of first and second ends thereof to partially cover the side wires;
• and
• inserting the wire part into an injection mold and then injection-molding side guides covering the side wires, the contact parts of the at least one first support wire, and the curved parts of the at least one second support wire,
• wherein each of the side guides comprises:
• a main body covering one of the side wires;
• a rotation preventing part covering a contact part of the at least one first support wire contacting one of the side wires and a contact part of a hook part contacting one of the side wires, wherein the hook part is integrally formed to extend from the first and second ends of the at least one first support wire in a horizontal direction of a vehicle seat;
• and
• an injury preventing part covering a contact part of the at least one second support wire contacting one of the side wires.