Device for taking a pipe, a cable or a similar object through a wall or ceiling opening comprises a conic compression spring with specified outside and inside diameters respectively at the small end and at the base

摘要

The device (1) for taking a pipe, a cable or a similar object through a wall or ceiling opening comprises a conic compression spring (30) whose outside diameter at the small end is smaller and whose inside diameter at the base is larger than the diameter of the opening.