| 摘要 |
<p>A device for making through openings in reinforced concrete articles during their production comprises an insert corresponding to the form of the opening to be made and having an axial channel (4) and a lock for fixing the position of the insert in relation to a calibrating opening of the mould (13). The lock consists of two elements of a wedged stop (9) whose vertical surface (15) interacts simultaneously with the wall of the axial channel (4) of the insert and with the wall of the calibrating opening (12) of the mould (13), as well as with the inclined working surface (14) of the insert facing the axis of the channel, and of a rod (10) whose length exceeds that of the axial channel of the insert mounted in the channel (4) with the possibility of reciprocating movement along its axis. One of the ends of the rod (10) is provided with a head (17), and the other end with a bevel (18) capable of interacting with the inclined surface (14) of the wedged stop (9). The inclined working surface of the wedged stop (9) is provided with a longitudinal groove (19) of semicircular cross-section corresponding to the diameter of the rod (10). The rod (10) has an internal annular slot (24) whose width (h) corresponds to the length of the mutual movement of the rod (10) and the wedged stop (9). The rod (10) is provided with an annular protrusion (25) for interaction with the annular slot (24).</p> |
