| CPC B60R 16/0222 (2013.01) | 8 Claims |
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1. A grommet comprising:
a base member made of a synthetic resin material having an insulation property through which a wiring material having electrical conductivity is inserted to be passed through a through hole of an insertion target;
an annular water stop member made of an elastically deformable synthetic resin material softer than the base member, and disposed integrally with the base member; and
a holding mechanism that causes the base member and the water stop member to be held by an annular flat plate part on a periphery of the through hole of the insertion target and an annular projection part that is projected from an end part of an inner peripheral edge of the annular flat plate part toward one hole axis direction of the through hole, wherein
the base member includes: an annular flange including an outer peripheral part that is disposed to be coaxially opposed to an inner peripheral part of the annular flat plate part with a gap in another hole axis direction of the through hole; a cylindrical body that has a cross section orthogonal to a hole axis of the through hole having a shape similar to a shape of a cross section of the annular projection part orthogonal to the hole axis of the through hole, and is coaxially projected from the flange toward the one hole axis direction to be inserted through the through hole on an inner side than the outer peripheral part of the flange; a plurality of cantilever locking piece parts disposed in a circumferential direction with respect to the cylindrical body, a tip of the cantilever locking piece part folded back in the other hole axis direction from an outer peripheral surface side of the cylindrical body being caused to be a free end, the free end side being projected from the outer peripheral surface of the cylindrical body, and the cantilever locking piece part being able to be bent to change a projecting amount on the free end side from the outer peripheral surface; and a plurality of locking parts that are disposed at respective free ends of the locking piece parts to lock a locking end part on the one hole axis direction side of the annular projection part from the one hole axis direction side of the locking end part,
the water stop member includes: an annular main body that is disposed coaxially and integrally with a wall surface on the one hole axis direction side of the outer peripheral part of the flange; and an annular lip that is projected from the main body in the one hole axis direction, and brought into intimate contact with the inner peripheral part of the annular flat plate part over a round in a circumferential direction while being elastically deformed,
the locking parts are arranged in the hole axis direction at the free end of the locking piece part, and one of the locking parts adjacent to each other in the hole axis direction is arranged to be closer to the outer peripheral surface side of the cylindrical body and the flange side than the other one of the adjacent locking parts, and
the holding mechanism locks the locking end part by any one of the locking parts, and causes pressing force of the lip in an elastically deformed state to act on the inner peripheral part of the annular flat plate part to cause the base member and the water stop member to be held by the annular flat plate part and the annular projection part.
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