Mat seal cover of waterproof connector

1. A mat seal cover of a waterproof connector, wherein the mat seal cover is configured to be attached to a connector housing through a mat seal, the mat seal cover comprising:

a cover body having a plurality of through holes that correspond to terminal insertion holes of the mat seal corresponding to terminal reception portions of the connector housing;

waterproof pins provided inside the through holes of the cover body and configured to close the terminal insertion holes of the mat seal, the waterproof pins terminate inside the through holes at rear ends, and the rear ends include abutment surfaces located inside the through holes; and

breakable pin retention portions provided within the through holes and between the waterproof pins and inner circumferential walls of the through holes of the cover body so as to bridge gaps therebetween,

wherein the waterproof pins are retained in the through holes by the pin retention portions and the waterproof pins corresponding to the terminal reception portions located in use positions are configured to be punched and removed when the pin retention portions are broken by a punching jig pushed in from a rear of the mat seal cover in a pushing direction; and

wherein coupling portions that are arranged between the pin retention portions and the inner circumferential walls of the through holes and that couple the pin retention portions with the inner circumferential walls of the through holes are disposed more closely to a front side in the pushing direction of the punching jig than the abutment surfaces at the rear ends of the waterproof pins against which the punching jig abuts, the pin retention portions include rear end faces located inside the through holes, the rear end faces of the pin retention portions are inclined faces extending from the abutment surfaces toward the coupling portions, and the rear end faces are inclined to the front in the pushing direction of the punching jig.

2. The mat seal cover of a waterproof connector according to claim 1 , wherein a pre-shear breaking surface of each of the coupling portions between the pin retention portions and the inner circumferential walls of the through holes has a front end in the pushing direction of the punching jig that is a pointed end shape pointed to the front in the pushing direction.

3. The mat seal cover of a waterproof connector according to claim 1 , wherein the pin retention portions retaining adjacent ones of the waterproof pins are disposed to be displaced from each other in the pushing direction of the punching jig.

4. The mat seal cover of a waterproof connector according to claim 1 , wherein the coupling portions between the pin retention portions and the inner circumferential walls of the through holes are disposed in bottom faces of concave portions provided in the inner circumferential walls of the through holes.

5. The mat seal cover of a waterproof connector according to claim 1 , wherein the pin retention portions are integrally formed as a single piece with each of a respective one of the waterproof pins and the inner circumferential surface of a respective one of the through holes.

6. The mat seal cover of a waterproof connector according to claim 1 , wherein

each of the through holes includes a pair of openings spaced apart from each other in a pushing direction of a punching jig: and

each of the waterproof pins terminates in a respective one of the through holes at the rear end such that the abutment surface is located in the through hole at a location that is spaced away from each of the openings.

7. The mat seal cover of a waterproof connector according to claim 1 , wherein each pin retention portion retaining a first one of the waterproof pins is displaced in the pushing direction from each pin retention portion retaining a second one of the waterproof pins, and the second one of the waterproof pins is adjacent to the first one of the waterproof pins.