US Patent 10029128 Auto-arresting safety device

An auto-arresting safety device includes a shell member, an axle connected to the shell member, a wire rope drum assembly attached to and rotatable on the axle, a fall arrest assembly coupled to and rotatable on the axle, and a brake assembly connected to the shell member and stopped at the fall arrest assembly. When the wire rope drum assembly receives a fall load over a threshold load, the wire rope drum assembly and the fall arrest assembly are joined together, and at the same time, the brake assembly brakes the rotation of the wire rope drum assembly and the fall arrest assembly intermittently until the wire rope drum assembly stops rotating. The auto-arresting safety device of the invention allows the wire rope drum assembly to rotate intermittently until fully stoppage, thereby effectively reducing and dispersing the instantaneously produced maximum fall load.