Portable terminal device

A portable terminal device, comprising:

• an upper casing configured to be a front face of the portable terminal device;
• a lower casing positioned substantially behind the upper casing;
• a pair of slide grooves defined in a substantially lower half region of said upper casing closely to respective opposite side faces of said upper casing and extending in a longitudinal direction of said upper casing;
• a pair of slide grooves defined in a substantially upper half region of said lower casing closely to respective opposite side faces of said lower casing and extending in a longitudinal direction of said lower casing;
• a pair of joint holes which are defined in said upper casing near respective lower ends of said slide grooves defined in said lower casing and visible through said slide grooves defined in said lower casing when respective confronting faces of said upper casing and said lower casing are superposed on each other;
• a pair of joint holes which are defined in said lower casing near respective upper ends of said slide grooves defined in said upper casing and visible through said slide grooves defined in said upper casing when the respective confronting faces of said upper casing and said lower casing are superposed on each other;
• a pair of upper casing slide connection members slidably engaging in the slide grooves defined in said upper casing;
• a pair of lower casing slide connection members slidably engaging in the slide grooves defined in said lower casing;
• a guide shaft mounted to said lower casing, the guide shaft including a rod-shaped shaft body, and a spring and a joint which are fitted over said rod-shaped shaft body, said joint being configured to rotate around a longitudinal axis of the guide shaft as said spring is extended and contracted;
• and
• an engagement member included on at least one of said lower casing slide connection members, and the engagement member is configured to be joined to the joint of said guide shaft while the joint of said guide shaft rotates around the longitudinal axis of the guide shaft when the spring is extended and contracted,
• wherein said upper casing and said lower casing are slidably connected to each other by securing said upper casing slide connection members slidably engaging in the slide grooves defined in said upper casing, in said joint holes in said lower casing, and by securing said lower casing slide connection members slidably engaging in the slide grooves defined in said lower casing, in said joint holes in said upper casing, with the respective confronting faces of said upper casing and said lower casing being superposed on each other.