Patent ID: 7543437

Claim:
A link plate assembly, comprising: at least one first plate having a first aperture, a second aperture and a receiving aperture, at least one convex portion formed on the first plate; at least one second plate having a first aperture and a second aperture, at least one concave portion formed on the second plate; at least one pin having one end secured to the first aperture of the first plate and the other end having a head portion and a groove portion, a diameter of the head portion being less than a diameter of the receiving aperture and a diameter of the first aperture of the second plate such that the head portion passes through the receiving aperture and the first aperture of the second plate, the diameter of the head portion being greater than a diameter of the second aperture of the first plate to block the head portion, a diameter of the groove portion being less than the diameter of the second aperture of the first plate such that the groove portion passes through the second aperture of the first plate; and wherein the at least one convex portion faces the second plate and the at least one concave portion faces the first plate; the at least one convex portion of the first plate contacts with a non-concave part of the second plate when assembling the link plate assembly; the at least one convex portion of the first plate coincides with the at least one concave portion of the second plate to disassemble the link plate assembly as the second plate is rotated relative to the first plate in a predetermined angle.