| 摘要 |
<p>The tool is made up of two tool parts fastened to each other and rotating around a pin (1); both tool parts are provided with a clamp shank (2, 3) projecting from the pin (1) in one direction and with a jaw (4, 5) reaching from the pin (1) in the other direction. The first jaw (4) has a prick (7) towards the second jaw (5) with a cylindrical body (9) that comes to a conical piercing end (8). On the second jaw (5), against the prick (7) there is a borehole (6) whose diameter (d1) is larger than the diameter (d2) of the cylindrical body (9) of the prick (7). The cylindrical body (9) is connected to the second jaw (5) via a base part (10). The diameter of this base part (10) at its connection with the cylindrical body (9) is identical to the diameter (d2) of the cylindrical body (9). The base part (10) is gradually widened from the cylindrical body (9) to the second jaw (5); its diameter (d3) at the connection to the second jaw (5) is larger than the diameter (d1) of the borehole (6). During the procedure, the plates to be clamped together are fitted together, the overlapping part is inserted between the tool jaws (4, 5), the piercing end (8) of the prick (7) is focused on a single clamping point, and by squeezing the clamp shanks (2, 3) of the tools the plates are punched through; then the tool is opened, and the plates are removed. After the removal of the punched plates, the tool or the plates are turned upside down, and the piercing end (8) of the prick (7) is inserted into the opening produced at the clamping point from the other side, and then by closing the tool again the plates are permanently clamped together in their own material.</p> |
