| 摘要 |
The invention concerns a screw/bolt joint comprising a screw fastener element screwed into a blind hole or into a hole formed with an abutment shoulder, said screw fastener element having an externally threaded shank. The invention is characterized primarily in that the threaded shank (4) comprises a cavity (6) which opens towards the free shank end (7) and at least one longitudinal/axial through-slit (8) which extends towards the free shank end (7) into the cavity (6), and in that a spreader/expander member (Z) when supported against the bottom (5) of the hole (13) or against said abutment shoulder is arranged, upon screwing of said screw fastener element (E) into said hole (13), to be driven into the cavity (6) at the free end (7) of the threaded shank (4). The member (Z) then expands the threaded shank (4) in such a manner that the external threads (5) on the threaded shank (4) are pressed against the wall of the hole (13), essentially at right angles to the direction of introduction of said screw fastener element. |
