Attachment structure of car sound apparatus

An attachment structure for mounting a car sound apparatus by inserting the apparatus longitudinally in a rearward horizontal direction into an opening of an inner case which is fitted in an opening of a dashboard of a car, comprising:

• said inner case having walls surrounding the opening of the inner case into which the sound apparatus is inserted, including at least one side wall having a pin retaining portion facing toward a forward horizontal direction, opposite from said rearward horizontal direction, having a front inclined edge inclined at an angle relative to a vertical direction and a pin retaining groove disposed in the rearward horizontal direction behind said front inclined edge;
• a lock pin unit including a first plate mounted to one side of the sound apparatus corresponding to said one side wall of said inner case, a second plate and a sliding means for mounting said second plate to said first plate so as to be slidable upwardly and downwardly in the vertical direction;
• said second plate having a pin extending in a transverse horizontal direction, which is perpendicular to said forward and rearward horizontal directions;
• wherein upon insertion of the apparatus into the opening of said inner case, said pin of said lock pin unit is slidingly engaged with said front inclined edge of said pin retaining portion of said one side wall of said inner case to displace said pin and said second plate vertically upward along said front inclined edge and then vertically downward into said pin retaining groove for mounting the apparatus into said inner case, and conversely, for detaching the apparatus from said inner case, said pin is displaced vertically upward out of said groove and vertically downward along said inclined edge.