A portable power driven system for advancing a rope, the rope extending in a first main direction, the power driven system comprising: - a motor comprising a drive shaft; - a rope grab arrangement, the rope grab connected to the drive shaft of the motor for rotation of the rope grab, and - a main body for mounting the motor and the rope grab arrangement, the main body further comprising an anchoring point adapted to receive the anchoring force, the anchoring force extending in a second direction being essentially opposite to the first main direction, wherein the rope grab arrangement comprises: - an essentially circular rope grab (100, 100'), wherein the rope grab is configured to, during operation, engage the rope along at least a section of a circumference of the rope grab, wherein a rope engaging face of the rope grab has a concave form for engaging the rope, and - a securing device comprising a first roller, the securing device arranged adjacently to the rope grab and configured to, by means of the first roller, exert a pressure to the rope for forcing the rope towards the rope grab at a portion of the section where the rope, during operation, is engaging the rope grab, characterized in that: - the securing device further comprises a first elongated leaver, the first elongated leaver at a first end having a hinged connection to the portable power driven system and at a second end configured to receive the first roller, - the securing device further comprises a second elongated leaver, the second elongated leaver at a first end having a hinged connection to the first end of the first elongated leaver and at a second end provided with a second roller positioned to, during operation, engage with the rope at the section of the circumference of the rope grab, - the pressure is providing a force proportional to a loading force applied to the portable power driven system at the anchoring point, and - the rope engaging face is provided with a plurality of pins configured to contact the rope along the section of the circumference of the rope grab engaging the rope during operation of the rope grab arrangement. - a motor comprising a drive shaft; - a rope grab arrangement, the rope grab connected to the drive shaft of the motor for rotation of the rope grab, and - a main body for mounting the motor and the rope grab arrangement, the main body further comprising an anchoring point adapted to receive the anchoring force, the anchoring force extending in a second direction being essentially opposite to the first main direction, - an essentially circular rope grab (100, 100'), wherein the rope grab is configured to, during operation, engage the rope along at least a section of a circumference of the rope grab, wherein a rope engaging face of the rope grab has a concave form for engaging the rope, and - a securing device comprising a first roller, the securing device arranged adjacently to the rope grab and configured to, by means of the first roller, exert a pressure to the rope for forcing the rope towards the rope grab at a portion of the section where the rope, during operation, is engaging the rope grab, - the securing device further comprises a first elongated leaver, the first elongated leaver at a first end having a hinged connection to the portable power driven system and at a second end configured to receive the first roller, - the securing device further comprises a second elongated leaver, the second elongated leaver at a first end having a hinged connection to the first end of the first elongated leaver and at a second end provided with a second roller positioned to, during operation, engage with the rope at the section of the circumference of the rope grab, - the pressure is providing a force proportional to a loading force applied to the portable power driven system at the anchoring point, and - the rope engaging face is provided with a plurality of pins configured to contact the rope along the section of the circumference of the rope grab engaging the rope during operation of the rope grab arrangement.