| 摘要 |
An attachment unit is made up of a nail and a sleeve fitted onto the nail. The nail has an axially elongated shank with a head at one end. The sleeve has a first axially extending section followed by a second axially extending section with the second section located closer to the head. A flange is located at the end of the first sleeve section spaced from the second sleeve section. An exterior thread with a root diameter is formed on the first sleeve section. The second sleeve section has a outside diameter smaller than the root diameter of the thread. When the nail is driven into a receiving material, its head runs into and laterally deforms the second sleeve section. After the nail is driven in, a nut can be placed over the second sleeve section and threaded onto the exterior thread.
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