Abseiling cable drum assembly - has air bleed channels for housing chambers to give braked action to cable drum from beginning of unwinding without free fall

摘要

The cable system for use in abseiling, such as in a rescue operation, has an air bleed channel (10,17), for at least one housing chamber, opening to the outer side of the housing (9) or into a unit (28) fixed to the housing. After the air has been fully evacuated from the chambers, the opening is sealed by a closing screw (12). The sealing is a sealing ring lip assembly (34), with a rectangular cross section, with a tight fit in the drilling at the end wall (22). A sealing body with an air gap is formed with the shaft (4), with a sealing lip pressed against the shaft (4) which, in the original conditions, ends at a smaller dia. than the inner dia. of the sealing body. Pref. the ring seal (34) is of polyurethane. USE/ADVANTAGE - The unit carries the cable to be clipped to a harness for abseiling in rescue and similar operations. The structure gives a braked action on the cable unwinding, without a free fall before the braking system comes into play.