| 摘要 |
<p>The invention relates to a device providing assistance in the working of pipes, including: a plate (5) having an internal cavity and comprising parts (13A, 13B, 13C) assembled together such that they can pivot to occupy a closed position in which they are joined to form a ring; and a plate locking device. The adjacent ends of two plates (13A, 13B, 13C) include corresponding surfaces that are shaped to co-operate and establish a connection as the plate (5) moves into the closed position. Each connection comprises two complementary surfaces (37) that come into contact with one another in the closed plate position. The locking device comprises at least one catch which can be actuated in said position and which acts on the adjacent ends of the plates (13A, 13B, 13C) in order to clamp the complementary contact surface against one another.</p> |
