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.

Described herein are braking mechanisms and related methods of using eddy current interactions to resist relative movement between members, the magnetic flux about an eddy current region being modified beyond an inherent drag effect resulting from a simple magnetic pole arrangement.

A magnetic force reducer is mounted on a holder having a belt and contains: a drive shaft, multiple rotators, and a magnetic conduct ring. The drive shaft is configured to rotate a rotatable disc, and the rotatable disc has multiple rotation segments and multiple first support portions. The multiple rotators are rotatably connected on two surfaces of the rotatable disc in parallel. A respective one rotator includes a swing arm rotatably connected with a respective one rotation segment and having a conductive rotation element and a second support portion. A resilient element is connected between the second support portion and a respective one first support portion of the rotatable disc. The magnetic conduct ring is fitted around the conductive rotation element of the respective one rotator to produce a magnetic field.

Described herein is a system, method of use and Self Retracting Lifeline (SRL) apparatus using a system that governs a dynamic response between members causing a halt in relative motion between the members. Magnetic interactions, eddy current drag forces and centrifugal and/or inertial forces may provide various mechanisms of governing movement.

Described herein is a system, method of use and Self Retracting Lifeline (SRL) apparatus using a system that governs a dynamic response between members causing a halt in relative motion between the members. Magnetic interactions, eddy current drag forces and centrifugal and/or inertial forces may provide various mechanisms of governing movement.

An automatic descent control device includes a line configured to be attached to a load. A line system retracts slack from the line when the line is not loaded and extends the line when the line is loaded. At least one braking system provides a braking force when the line is loaded so as to control extension of the line and a descent rate of the load. The at least one braking system is operable in at least two configurations, a first configuration that the at least one braking system lowers the load at a first descent rate, and a second configuration that the at least one braking system lowers or locks the load at a second descent rate. The load being a constant and the first descent rate is greater than the second descent rate.

An automatic descent control device includes a line configured to be attached to a load. A line system retracts slack from the line when the line is not loaded and extends the line when the line is loaded. At least one braking system provides a braking force when the line is loaded so as to control extension of the line and a descent rate of the load. The at least one braking system is operable in at least two configurations, a first configuration that the at least one braking system lowers the load at a first descent rate, and a second configuration that the at least one braking system lowers or locks the load at a second descent rate. The load being a constant and the first descent rate is greater than the second descent rate.

Described herein is a system, method of use and Self Retracting Lifeline (SRL) apparatus using a system that governs a dynamic response between members causing a halt in relative motion between the members. Magnetic interactions, eddy current drag forces and centrifugal and/or inertial forces may provide various mechanisms of governing movement.

Described herein is a system, method of use and Self Retracting Lifeline (SRL) apparatus using a system that governs a dynamic response between members causing a halt in relative motion between the members. Magnetic interactions, eddy current drag forces and centrifugal and/or inertial forces may provide various mechanisms of governing movement.

Disclosed is a smart emergency escape backpack, comprising a harness bound to a user and a controlled descent mechanism; wherein the controlled descent mechanism includes an anchor support, a hub mounted on the anchor support, and a centrifugal speed reduction damper fitted with the hub, a cable being wound around the hub; wherein a cable take-up actuating mechanism is further provided on the anchor support, and the cable take-up actuating mechanism includes an electric motor, a transmission structure connected to the electric motor, and a synchronous wheel connected to the transmission mechanism, the synchronous wheel actuating the hub to rotate reversely.