A line dispensing device includes a housing, a rotatable shaft rotatably supported by the housing and defining a rotational axis, and a line drum disposed about the rotational axis and configured to extend and retract a line from the housing. The line dispensing device also includes a retraction assembly disposed about the rotational axis and configured to generate a retraction force and retract the line from the housing, and a braking assembly disposed about the rotational axis and configured to generate a braking force on the line and during extension of the line from the housing.

A rope grab device for a portable power driven system adapted for advancing a rope includes an essentially circular rope grab, wherein the rope grab is adapted to, during operation, engage the rope along at least a section of a circumference of the rope grab. The rope grab device also includes a securing device comprising a lever portion, a first roller arranged at one end of the lever portion and an anchoring point arranged at the opposite end of the lever portion adapted for receiving an anchoring force. The lever portion is attached with a hinged connection and is adapted 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 upon applying the anchoring force on the anchoring point.

A rope grab device for a portable power driven system adapted for advancing a rope includes an essentially circular rope grab, wherein the rope grab is adapted to, during operation, engage the rope along at least a section of a circumference of the rope grab. The rope grab device also includes a securing device comprising a lever portion, a first roller arranged at one end of the lever portion and an anchoring point arranged at the opposite end of the lever portion adapted for receiving an anchoring force. The lever portion is attached with a hinged connection and is adapted 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 upon applying the anchoring force on the anchoring point.

The present invention application provides a set of escaping devices for self-rescue, mutual rescue, and help-calling from high buildings or places in danger or emergencies. The escaping devices comprise at least one first and multiple sets of second devices, which can meet the needs of people from one or more families, one or more classes of teachers and students, and one or more office personnel. All devices have three ways to regulate the descent speed. The escapees can effectively and orderly leave the dangerous environment through help of the intercom answering machine and quickly count the survivors. If there are trapped people, the rescue center can activate the wireless calling system to detect and locate the trapped people and carry out rapid rescue.

The present invention application provides a set of escaping devices for self-rescue, mutual rescue, and help-calling from high buildings or places in danger or emergencies. The escaping devices comprise at least one first and multiple sets of second devices, which can meet the needs of people from one or more families, one or more classes of teachers and students, and one or more office personnel. All devices have three ways to regulate the descent speed. The escapees can effectively and orderly leave the dangerous environment through help of the intercom answering machine and quickly count the survivors. If there are trapped people, the rescue center can activate the wireless calling system to detect and locate the trapped people and carry out rapid rescue.