Safety rope for speleology, has external tubular sheath surrounding internal core in predetermined degree of tightness, touch identifying part to localize center point or extremity zone when rope is unwound in users hand

摘要

The rope (10) has an external tubular sheath (16) surrounding an internal core (12) in a predetermined degree of tightness. A touch identifying part (18) localizes a center point or an extremity zone when the rope is unwound in a users hand. The part is formed by increasing or decreasing a diameter of the rope. The part can also be formed by ridges (20) made inside the sheath.