connector consists of a male connector part linked to the tension line and operable to penetrate a female receptacle part being part of the anchoring point and having an upper necked portion forming an internal circular shoulder . the connector comprising a cylindrical body connected to the line and an internal cavity whose cylindrical wall is provided with a circular series of openings to the outside . each opening receives a dog operable to assume a first , extended position projecting radially beyond the connector wall , radially abutting said wall and bearing upon the bottom surface of the opening under the urging of a spring and a second , retracted position during descent of the male connector part due to the pushing of the inclined bottom face of the end of the dog against the mouth of the female receptacle part . each dog further has an inclined ramp acting as a cam in cooperation with an operating pin whose upward vertical displacement , by the pin pressing against and sliding along the ramp , retracts the dog . the pins are connected to a hub and spoke - like assembly operating on all pins simultaneously .