Hinge device and keyboard dock and portable electronic device having the same

A keyboard dock, comprising:

• a base, having a keyboard module;
• a supporting plate, for supporting a portable computer;
• and
• a hinge device, comprising:
• a body;
• a torsion generating part, pivotally connected to the body and fixed to the base, and having a first wedging unit;
• a rotating part, pivotally connected to the body and fixed to the supporting plate;
• and
• a second wedging unit, assembled to the rotating part and moved along with the rotating part, wherein the first wedging unit and the second wedging unit are wedged to each other or separated from each other when the rotating part rotates relative to the body along a first axis, the base is parallel to the supporting plate when the first wedging unit and the second wedging unit are wedged to each other, and the body is capable of rotating relative to the torsion generating part along a second axis when the first wedging unit and the second wedging unit are separated from each other, and the first axis is vertical to the second axis,
• wherein the first wedging unit is a wedging hole, the second wedging unit comprises a rotating disk and at least one linkage lever connected to each other, the rotating disk is assembled to the rotating part and is rotated along with the rotating part, the rotating disk drives the linkage lever to pass through the first wedging unit or separate from the first wedging unit when the rotating part and the rotating disk synchronously rotate relatively to the body,
• wherein the hinge device further comprises a fixing lever;
• and wherein a groove is set on the rotating disk, one end of the fixing lever is pivotally connected to the body, and another end of the fixing lever is wedged into the groove to limit rotation of the rotating disk when the linkage lever is separated from the first wedging unit.

A portable electronic device, comprising:

• a host;
• a display unit, electrically connected to the host;
• and
• a hinge device, comprising:
• a body;
• a torsion generating part, pivotally connected to the body and fixed to the host, and having a first wedging unit;
• a rotating part, pivotally connected to the body and fixed to the display unit;
• and
• a second wedging unit, assembled to the rotating part and moved along with the rotating part, wherein the first wedging unit and the second wedging unit are wedged to each other or separated from each other when the rotating part rotates relative to the body along a first axis, the host is parallel to the display unit when the first wedging unit and the second wedging unit are wedged to each other, and the body is capable of rotating relative to the torsion generating part along a second axis when the first wedging unit and the second wedging unit are separated from each other, and the first axis is vertical to the second axis,
• wherein the first wedging unit is a wedging hole, the second wedging unit comprises a rotating disk and at least one linkage lever connected to each other, the rotating disk is assembled to the rotating part and is rotated along with the rotating part, the rotating disk drives the linkage lever to pass through the first wedging unit or separate from the first wedging unit when the rotating part and the rotating disk synchronously rotate relatively to the body,
• wherein the hinge device further comprises a fixing lever, wherein a groove is set on the rotating disk, one end of the fixing lever is pivotally connected to the body, and another end of the fixing lever is wedged into the groove to limit rotation of the rotating disk when the linkage lever is separated from the first wedging unit.