Waterproofing case and method of manufacturing waterproofing case

A waterproofing case that has a first case and a second case each including an annular bonding portion, the waterproofing case comprising:

• an outer wall, located in an end surface of one of the annular bonding portions of the first case and the second case, that is provided with a certain height over the entire perimeter thereof;
• parallel grooves that are formed at a certain position inside the outer wall by a barrier rib and an inner wall which have the same height as the outer wall, wherein the barrier rib is arranged in parallel to the parallel grooves;
• a cutout portion provided at a middle portion of the barrier rib so as to allow one of the parallel grooves to communicate with the other parallel groove, the parallel grooves being closed by end wall positions where an adjacent relationship there-between is terminated, respectively;
• a plastic elastomer that is cured after coating is disposed on an inner end surface of and bottoms of the parallel grooves using one end wall of the parallel grooves as a start point and other end wall as an end point, wherein the plastic elastomer has a first distinct free end at one end of one parallel groove, and the plastic elastomer has a second distinct free end at an end of another parallel groove;
• and
• a linear protrusion, located in an end surface of the annular bonding portion of the other first case and the second case, that when the first case and the second case are bonded to each other, does not arrive at the end surface adjacent to the end wall and longitudinally bisects an exposed portion of the plastic elastomer,
• wherein the linear protrusion is continued to cross the barrier rib at the position of the cutout portion.

A method of manufacturing a waterproofing case, comprising:

• providing a first case and a second case each including an annular bonding portion;
• providing a non-annular groove, in one of annular bonding portions of the first case and the second case, having a start point side groove and an end point side groove;
• wherein the start point side groove and the end point side groove are provided in parallel to each other by a barrier rib having a certain length, and the barrier rib is arranged in parallel to the start point side groove and in parallel to the end point side groove;
• providing a cutout portion at a middle portion of the barrier rib to allow the start point side groove and the end point side groove to communicate with each other;
• and
• providing, on the annular bonding portions of the other of the first case and the second case, a linear protrusion that does not arrive at an end surface adjacent to an end wall and longitudinally bisects an exposed portion of a plastic elastomer disposed within the non-annular groove when the first case and the second case are bonded to each other, wherein the plastic elastomer has a first distinct free end at the start point side groove, and the plastic elastomer has a second distinct free end of the end point side groove,
• wherein the linear protrusion is continued to cross the barrier rib at the position of the cutout portion and the plastic elastomer is cured after coating to have elasticity.