Pulling plug aided by drag forces of a fluid medium for a portion of which the plug has a leaking aperture

Pulling plug for use in installing a cable in a conduit with the aid of drag forces of a gaseous medium which flows rapidly along a part of the cable already introduced into the conduit from an inlet end of the conduit in a direction of installation towards an outlet end of the conduit, said pulling plug comprising:

• a substantially tubular housing,
• coupling means for tension-proof coupling of said pulling plug to a foremost end of a cable to be installed,
• sealing means for producing a circumferential suction seal around said housing with an adjacent inside wall portion of said conduit,
• a leaking aperture within said housing for said gaseous medium, and
• size determining means for setting said leaking aperture to be sized for passing a flow quantity of said gaseous medium along said part of the cable already introduced into the conduit during installation which is sufficient for exerting said drag forces on said part of the cable, and so that said flow quantity creates a pressure-difference for energization of said pulling plug resulting in application of a tensile force on the foremost end of the cable;
• wherein said size determining means include pressure-dependent adjustment means for varying the size of said leaking aperture during installation.