Patent ID: 8478369

Claim:
A mobile device comprising: a first housing; and a second housing, wherein said first housing includes: a first track surface parallel to a first direction, and a first housing first flat surface perpendicular to said first direction, wherein said second housing includes: a first pin, and a second housing first flat surface facing to said first housing first flat surface, wherein said first pin protrudes in said first direction from said second housing first flat surface, wherein said second housing first flat surface slides along said first housing first flat surface, and wherein said first pin slides along said first track surface, wherein said first housing includes: a second track surface, and a first housing second flat surface perpendicular to said first direction, wherein said first housing first flat surface and said first housing second flat surface face in directions opposite to each other, wherein said second housing includes: second to fourth pins, and a second housing second flat surface facing to said first housing second flat surface, wherein said second pin protrudes in said first direction from said second housing first flat surface, wherein each of said third pin and said fourth pin protrudes in said first direction from said second housing second flat surface, wherein said first groove is provided along said first housing first flat surface, wherein said first track surface is a first wall surface of said first groove, wherein said second groove is provided along said first housing second flat surface, wherein said second track surface is a second wall surface of said second groove, wherein said first pin includes: a first pin portion arranged in said first groove, wherein said second pin includes: a second pin portion arranged in said first groove, wherein said third pin includes: a third pin portion arranged in said second groove, wherein said fourth pin includes: a fourth pin portion arranged in said second groove, wherein each of said first to fourth pins is a cylindrical body of which an axial direction corresponds to said first direction, wherein said first to third pin parts have said same diameter, and wherein said fourth pin portion has a diameter smaller than that of said first to third pin parts.