Patent ID: 9604513
Date: 2017-03-28
CPC Classifications: B60D

Claim:
1. An apparatus comprising: a cap that includes a body having opened ends and an expanded pad attached to an inner circumferential surface of the body; and a towing pipe connected to one end of the cap, the towing pipe having an opening hole formed therein and an engagement part protruding from an inner circumferential surface of the opening hole, wherein the expanded pad does not close the opened ends of the body before being heated, expands when being heated, and closes the opened ends of the body after being heated, the body includes a ring-shaped ring plate and a plurality of legs protruding from one side of the ring plate and spacing apart from each other along a circumference of the ring plate, the plurality of legs includes wings formed at ends of the plurality of legs, and the plurality of legs are bent radially outwardly by expansion of the expanded pad such that the wings come in contact with the engagement part to prevent the plurality of legs from being separated after the expanded pad has expanded.