Patent ID: 8172622

Claim:
A socket structure stack, comprising at least two socket structures, each said socket structure comprising: a main body formed as a recessed structure and comprising: an inner plate having a receiving portion and an embedded portion, wherein the receiving portion is provided at a center of the inner plate, and the embedded portion is provided around the receiving portion and has a first surface and a second surface; and an outer plate surrounding the inner plate and forming the recessed structure in conjunction with the inner plate, the outer plate being thicker than the inner plate and having a third surface and a fourth surface; a plurality of conductive elements embedded in the embedded portion, each said conductive element having a first end and a second end opposite the first end, wherein the first end is exposed on the first surface, and the second end is exposed on the second surface; and a plurality of connecting elements provided on the outer plate; wherein adjacent said socket structures are connected by the connecting elements, wherein in each said socket structure, the connecting elements are fastener units each comprising a first fastener provided at an edge of the third surface and a second fastener provided at an edge of the fourth surface, and the outer plate is formed with through holes perpendicular to the third surface and the fourth surface, and the connecting elements are rods configured for passing through the through holes of the socket structures and thereby connecting the socket structures, the first end and the second end of each said conductive element are resilient metal plates, metal plates, or solder balls, and the first fastener of a socket structure is a latch to engage with the second fastener which is a bar of an adjacent socket structure.