Patent ID: 7353052

Claim:
A mobile terminal apparatus comprising: an upper housing and a lower housing, each having a first end portion oppositely disposed from a second end portion; a hinge for rotatably and slidably supporting both the upper and lower housings disposed at said first end portion of each of the upper housing and the lower housing, such that said housings slidably rotate at said hinge relative to each other between an opened state and a closed state; positioning means for positioning the housings in said closed state, said positioning means including a projection disposed at the second end portion of one of said housings and a recess disposed at the second end portion of the other housing facing said projection, said projection and recess releasably engaging each other to maintain the housings in a closed state; wherein each of said projection and recess includes a bilaterally symmetric sloped surface at least along the direction of a rotation locus of the projection; and while said projection is engaged in said recess, said projection contacts the surface of said recess on the sloped surfaces on both sides of said projection, and the front end portion of said projection does not contact the surface of said recess.