Patent ID: 8881462

Claim:
A door structure comprising: a cover for covering an accommodating space formed in a housing; a lodging part connected to an end of the cover for lodging in a slot on the housing; at least one first inverse hook part connected to the housing and disposed adjacent to a hole on the housing, the at least one first inverse hook part having a first fixing end connected to the housing and a first free end opposite to the first fixing end, a first inclined surface being formed on a side of the at least one first inverse hook part and extending from the first fixing end to the first free end of the at least one first inverse hook part; and at least one second inverse hook part connected to a side of the cover, the at least one second inverse hook part having a second fixing end connected to the cover and a second free end opposite to the second fixing end, a second inclined surface being formed on a side of the at least one second inverse hook part and extending from the second fixing end to the second free end of the at least one second inverse hook part, and the at least one second inverse hook part being inserted into the hole on the housing so that the second inclined surface of the at least one second inverse hook part wedges with the first inclined surface of the at least one first inverse hook part when the cover is in a closed position, wherein the first inclined surface of the at least one first inverse hook part and the second inclined surface of the at least one second inverse hook part are arc surfaces with substantially the same continuous curvature, a contacting area of the first inclined surface and the second inclined surface is increasing as the cover is rotating toward the housing and said closed position, and as the cover is rotating toward the housing and said closed position an arc movement of the at least one second inverse hook part corresponds to the continuous curvature of the first inclined surface of the at least one first inverse hook part so that there is no structural interference between the at least one first inverse hook part and the at least one second inverse hook part during rotation of the cover toward the housing and said closed position.