Abstract: A dual-axis hinge is mounted between a cover and a base of a portable device and has a connecting bracket, an upper rotating bracket, a lower rotating bracket, an upper active gear, a lower active gear and a transmission gear assembly. The connecting bracket is mounted between the upper and lower rotating brackets. The upper and lower active gears are connected respectively to the upper and lower rotating brackets. The transmission gear assembly is connected between the upper and lower active gears to adjust a velocity ratio of the upper and lower active gears. Therefore, the cover and the base align with each other without a drop whether or not the upper and lower active gears are the same in teeth number or whether or not the included angles between the upper and lower rotating brackets with the connecting bracket are the same.

Abstract: A hinge device and a keyboard dock and a portable electronic device having the same are provided. The hinge device includes a body, a torsion generating part, a rotating part and a second wedging unit. The torsion generating part is pivotally connected to the body and has a first wedging unit. The rotating part is pivotally connected to the body. The second wedging unit is assembled to the rotating part and moved along with the rotating part. The first wedging unit and the second wedging unit are wedged together or separated from each other while the rotating part rotates relative to the body along a first axis. The body can rotate along a second axis relative to the torsion generating part while the first wedging unit and the second wedging unit are separated from each other. The first axis is vertical to the second axis.

Abstract: A dual-axis hinge is mounted between a cover and a base of a portable device and has a connecting bracket, an upper rotating bracket, a lower rotating bracket, an upper active gear, a lower active gear and a transmission gear assembly. The connecting bracket is mounted between the upper and lower rotating brackets. The upper and lower active gears are connected respectively to the upper and lower rotating brackets. The transmission gear assembly is connected between the upper and lower active gears to adjust a velocity ratio of the upper and lower active gears. Therefore, the cover and the base align with each other without a drop whether or not the upper and lower active gears are the same in teeth number or whether or not the included angles between the upper and lower rotating brackets with the connecting bracket are the same.

Abstract: A hinge device and a keyboard dock and a portable electronic device having the same are provided. The hinge device includes a body, a torsion generating part, a rotating part and a second wedging unit. The torsion generating part is pivotally connected to the body and has a first wedging unit. The rotating part is pivotally connected to the body. The second wedging unit is assembled to the rotating part and moved along with the rotating part. The first wedging unit and the second wedging unit are wedged together or separated from each other while the rotating part rotates relative to the body along a first axis. The body can rotate along a second axis relative to the torsion generating part while the first wedging unit and the second wedging unit are separated from each other. The first axis is vertical to the second axis.