| 摘要 |
A safety screw for skates, including a male part, provided with a first head and with a first internally threaded stem, and a female part, provided with a second head and with a second stem that has a complementarily threaded first seat for the first stem. In this screw, the male part has an axial external reeding which is adjacent to the first head and has a slightly larger diameter than the first stem. The reeding interacts with a second seat that has a slightly smaller diameter. The second seat is formed at the free end of the female part, and is contiguous to the first seat. |
