Rollgliss
In common parlance, Rollgliss is a rescue and abseiling device for people that is used for height rescue and for workplace positioning. Strictly speaking, only devices from the Capital Safety Group (3M) are called “Rollgliss”, as they have protected the term as a registered trademark. The original manufacturer was Rescue Equipment BRDA in Bad Kohlgrub , which was later continued as Rollgliss GmbH in Murnau and taken over by the Capital Safety Group (3M). The company's Rollgliss R300 device was the first abseiling and rescue device with the principle of a blocking or freely rotating roller. It was invented by Otto Brda (†), operations manager of the Hörnlebahn in Bad Kohlgrub. Since the patent protection has expired, there are now other rescue and abseiling devices that work with this or a similar principle. The successor model of the original manufacturer is the R350 TOP, which is basically based on the same principle.
Functionality and application
The devices are based on the pulley principle . The rope runs through different roles. When rappelling up, the rope runs free, when rappelling down a backstop is activated. Depending on the reduction, the rope runs through further rollers (loose deflection rollers or rollers attached to the base plate / base body) so that a pulley system is created. It depends on the reduction used, which max. Weight may be roped up or down. The Rollgliss rescue and abseiling devices are available with the reduction ratios 1: 1, 2: 1, 3: 1 and 5: 1; Occasionally devices with a 4: 1 reduction were built. The deflection pulleys are exchangeable (in the R300 ST version used by the fire brigade , THW etc.) so that the devices can be converted. It should be noted that - according to the pulley principle - the lifting height decreases with increasing reduction ratio for the same rope length.