Patent ID: 8472175

Claim:
A folding electronic device comprising: a first case; a second case; and a hinge element comprising a shaft, a swing member, a gear, a stick, and a spring clip; and wherein the shaft is connected to the first case and passes through the swing member, the shaft is snugly fitted between two opposite inner surfaces of the swing member and drives the swing member to revolve; wherein the gear and the spring clip are connected to the second case, a receiving groove is formed in the middle of the gear and two openings extend from the two ends of the receiving groove, a protruding end is formed in the middle of the spring clip, when the spring clip is deformed, the protruding end engages with one tooth of the gear or passes through one opening to tip one end of the swing member; and wherein a connecting member is formed on a bottom of the cavity, the connecting member and the swing member define a round through hole respectively, the stick passes through the two round holes of the connecting member and the swing member to position the swing member. wherein the hinge element further comprises a cavity configured to accommodate the shaft, wherein when the first case turns over an about 180 degree angle relative to the second case from a folded position, the shaft pushes the swing member to revolve, the protruding end of the spring clip extrudes from the opening of the gear and engages with one tooth of the gear, the first case rotates relative to the second case under the horizontal direction or the vertical direction from any angle between about 0 and 180 degrees.