Patent ID: 8938855
Filing Date: 2015-01-27
Classification: E05D,E05Y,F16C,G06F,H04M,Y10T

Abstract:
1. A gear hinge device for connecting first and second housings of a portable terminal in such a manner that the first and second housings can be rotated about first and second hinge axes, respectively, the gear hinge device comprising: a first driving unit comprising a first driving cam gear that is rotated about the first hinge axis, and a first auxiliary gear integrally coupled to the first cam gear by a first coupling part; and a second driving unit comprising a second driving cam gear that is engaged with the first driving cam gear and rotated about the second hinge axis that is parallel to the first hinge axis, and a second auxiliary gear integrally coupled to the second, cam gear by a second coupling part; a single driven cam being engaged with the first and second driving cam gears to conduct a cam action, wherein the single driven earn is linearly moved along the first and second hinge axes in response to rotation of the first and second driving cam gears, wherein each of the first driving cam gear, the first auxiliary gear, the second driving cam gear and the second auxiliary gear is provided with a set of gear teeth, and wherein the first and second driving cam gears are arranged coaxially to the first and second auxiliary gears, respectively, and the first and second auxiliary gears are arranged to be engaged with each other, and wherein the first and second coupling parts comprise first and second protrusions that extend from the first and second auxiliary gears in a direction toward the first and second driving cant gears respectively along the first and second hinge axes and coupled to the first and second driving earn gears, respectively.