Patent ID: 9559738
Date: 2017-01-31
CPC Classifications: G06F,H04M

Claim:
1. A tablet device, comprising: a first member; a second member; and a pivot unit, wherein the first member pivots on the second member via the pivot unit, the pivot unit comprises a shaft, a twist sheet, a washer and a twist spring, the twist sheet is telescoped on the shaft, the twist spring is telescoped on the shaft and is connected to the twist sheet, the washer is disposed between the twist sheet and the twist spring, and the shaft is connected to the second member, and the twist sheet is fixed to the first member, wherein when an included angle between the first member and the second member is smaller than a first angle, the twist spring pushes the first member and the second member, wherein a torque of the twist spring is greater than a sum of a torque of the second member applied to a rotation axis and a torque for opening the pivot unit, wherein a sum of the torque of the first member applied to the rotation axis and the torque for closing the pivot unit is greater than the torque of the twist spring, wherein the sum of the torque of the twist spring and the torque for closing the pivot unit is greater than the torque of the first member applied to the rotation axis, wherein the sum of the torque of the twist spring and the torque for closing the pivot unit subtracting the torque of the first member applied to the rotation axis is greater than a torque of an external force applied to the rotation axis.