Patent ID: 6963766

Claim:
A hinge module for mechanically connecting a main body to a folder in a portable radio terminal, comprising: a hinge shaft having an angled portion on one end and a shaft on another end opposite the angled portion for rotating with the folder; a hinge cam facing the hinge shaft and having a pair of angled portions on the surface of the hinge cam facing the hinge shaft, a valley portion between the angled portions, a fixing post along a rotating axis, and a guide protrusion for facilitating sliding of the hinge cam with respect to the hinge shaft while restricting rotational movement of the hinge cam, each angled portion having a gentle slope and a steep slope, the gentle slope and the steep slope being asymmetrical to each other sidewise; a hinge spring disposed along the rotating axis and having one end connected to the fixing post of the hinge cam, for providing restoring force to the hinge cam; and a hinge housing for sequentially holding the hinge shaft with one end of the hinge shaft protruded, the hinge cam, and the hinge spring.