Abstract: A wheel mechanism includes a fixing base, a wheel base, a wheel, a fixing tube and a gasket. The gasket is disposed around the fixing tube to prevent the wheel with the wheel base from moving up and down. The upper gasket may be disposed between the fixing base and the wheel base to prevent the fixing base and the wheel base from colliding with each other to generate noise. The lower gasket may be disposed between the wheel base and the fixing tube to prevent the wheel base and the fixing tube from colliding with each other to generate noise. Further, when the wheel base is pivotally connected to the fixing base by the rotating shaft, the invention may selectively dispose at least one resilient member between at least two of the fixing base, the wheel base and the rotating shaft to prevent the wheel from shimmying.

Abstract: The plug of the connector mainly contains a plug assembly formed by joining two plug pieces, each providing a number of terminals arranged along two major sides of a blade. A conducting plate is sandwiched between the two plug pieces and contacts a metallic casing housing said plug assembly. The casing also contacts an EMI shielding wall enclosing the blades of terminals. The socket of the connector mainly contains a socket assembly formed by interleaving a number of insulating pieces and shielding pieces. Each insulating piece houses four L-shaped terminals and has L-shaped shielding plates positioned in the areas between the L-shaped terminals. The shielding plates contact a metallic plate embedded inside the insulating piece and/or the adjacent shielding piece and the metallic plates in turn contact a metallic casing housing the socket assembly. The casing also contacts an EMI shielding wall enclosing the slots of terminals.