Patent ID: 8134076
Filing Date: 2012-03-13
Classification: B60R,Y10T

Abstract:
1. A grommet to be installed in a through-hole in a vehicle body panel with said grommet being mounted on a wire harness for a motor vehicle, said grommet being made of rubber or elastomer, said grommet including a smaller diameter tubular section, a diameter enlargement tubular section continued to an end of said smaller diameter tubular section, and a vehicle body engagement annular recess on an outer surface of said diameter enlargement tubular section at a larger diameter side, said smaller diameter tubular section being inserted into said through-hole from one side of said vehicle body panel and being drawn from the other side of said vehicle body panel so that said vehicle body engagement annular recess is engaged with said vehicle body panel; said diameter enlargement tubular section being provided on an outer peripheral surface with a plurality of stepped projections that are spaced apart from one another in a peripheral direction and extend from said smaller diameter tubular section to said vehicle body engagement annular recess in an axial direction; each of said stepped projections being provided on an outer surface with an angle rib that protrudes from a connecting side end of said smaller diameter tubular section to a contact position on which said angle rib contacts with a peripheral edge around said through-hole when inserting said grommet into said through-hole, each of said angle ribs protruding from said connecting side end in a direction perpendicular to an axial direction of said grommet, each of said angle ribs being provided with a flat projection surface that protrudes in a direction perpendicular to a central axial line of said grommet, and with a slope that inclines from a crest projection end of said flat projection surface to an outer surface of said stepped projection; each of said angle ribs being provided on a whole length of an outer surface of each stepped projection in a peripheral direction, a virtual outer diameter D said slopes of said angle ribs disposed at lower positions being held on an inner peripheral surface of said through-hole with said smaller diameter tubular section being inserted in said through-hole, said grommet being held at a temporary position until said smaller diameter tubular section is drawn from the other side, and said slopes of each of said angle ribs disposed at upper positions being brought into contact with said peripheral edge around said through-hole at a position where said slopes at the upper positions do not pass over said vehicle body engagement annular recess while holding said grommet at said temporary position; said flat projecting surface of each of said angle rib interfering with said through-hole so that said grommet is blocked from entering said through-hole, and an inserting posture being corrected to a straight direction so that said flat projecting surfaces do not interfere with said through-hole.