| 摘要 |
<p>A key ring includes a casing with complementary casing walls. The casing walls have stem halves which project from surrounding wall portions thereof and which have semi-circular outer threaded surfaces that mate with each other so as to form a tubular stem with a spirally winding continuous threaded line thereon surrounding an axis. A nut member has an internal threaded surface at a proximate end portion thereof to screw on the tubular stem so as to clamp the stem halves together, and a retaining protrusion at a distal end portion thereof. A cap member has an enlarged head portion, and an engaging end portion with an elongated guiding groove to receive and guide the retaining protrusion when the engaging end portion is inserted into the nut member. A retaining recess is formed between the enlarged head portion and the engaging end portion, and extends angularly about the axis. Thus, once the retaining protrusion is brought to move along the guiding groove to slip into the retaining recess, the retaining protrusion can be rotated relative to the cap member about the axis so as to be retained in the retaining recess. A ring member is secured to the casing and is used to fasten keys thereon.</p> |
