| 摘要 |
The present invention provides a fastener for securing workpieces (22, 24) together, which has a stem (40) having an enlarged head (68) at one end that has a cavity (110), a main sleeve (32) and an expander sleeve (34). The expander sleeve is adapted to move into the main sleeve and the enlarged stem head is adapted to move, without any deformation, into the exèander sleeve. |
