Patent ID: 8839482

Claim:
A method, comprising: providing body springs and a rubber, the body springs being made of a metal material; providing a metal clamp in a horizontal plate shape, the clamp having horizontal protrusions at both sides thereof respectively; providing an adaptor to be coupled to a vehicle, the adaptor having insertion holes at both side faces thereof respectively; forming a plurality of through holes through major sides of the body springs; pressure-forming a plurality of protrusions corresponding to the plurality of through holes at a major side of the metal clamp such that the plurality of protrusions extend outward from the major side of the clamp, a height of the plurality of protrusions being larger than a vertical length of the plurality of holes; inserting the plurality of protrusions of the clamp into the respective plurality of through holes of the body springs so that a portion of each of the plurality of protrusions is outside of each of the plurality of through holes; pressure-deforming the portions of the plurality of protrusions outside of the plurality through holes such that the press-deformed portions enable tight fixation between the metal clamp and the body springs; coupling the rubber to the body springs; and coupling the adaptor to the metal clamp by inserting the horizontal protrusions of the clamp to the insertion holes of the adaptor respectively.