Endless cable winch with safety cable

摘要

An endless cable winch or hoist which is particularly suited for a service lift comprises a working cable and a safety cable, further comprises a driving cable pulley around at least a part of which the working cable is wrapped, further comprises a drive for driving the driving cable pulley, further comprises a non-driven safety cable pulley, which is rotatably mounted in a housing and around at least a part of which the safety cable is wrapped, and further comprises an arresting device which is coupled via a brake to the cable pulley and which blocks and brakes the safety cable by means of the brake when the safety cable moves with a predetermined speed at least in one direction.

主权项

1. An endless cable winch, comprising:
a housing; a driving cable pulley received within said housing; a working cable extending through the endless cable winch, at least partially being wrapped around said driving cable pulley; a drive for driving said driving cable pulley for moving the endless cable winch along said working cable; a non-driven safety cable pulley being mounted rotatably about an axis of rotation; a safety cable extending through the endless cable winch, at least partially being wrapped around said safety cable pulley; a friction brake being coupled to said safety cable pulley; and an arresting device comprising a ratchet wheel mounted rotatably within said housing on an axis common with said axis of rotation, and a pawl mounted on said housing engaging said ratchet wheel being coupled to said brake and being configured for activating said brake for blocking and braking said safety cable when said safety cable reaches a threshold speed at least in one direction; said pawl further comprising a first pawl arm and a second pawl arm, between which said pawl is pivotably mounted on said housing, said pawl being preloaded against said ratchet wheel so as to allow moving said first pawl arm along said ratchet wheel up to said threshold speed, and to effect latching with said second pawl arm into said ratchet wheel upon reaching said threshold speed of said safety cable, thereby activating said friction brake.