Pulley system allowing for passage of object attached to line

A pulley system for allowing passage of an object attached to a line passing around a pulley, comprising:

• a pulley attached to a housing structure via a rotatable attachment between said pulley and said housing structure, said pulley having an axis of rotation;
• said pulley comprising an outer circumference having a circumferential groove for retaining a line passing around said pulley while said pulley is rotating;
• and
• a structure forming an object passthrough window adjacent to said outer circumference for allowing passage of an object attached to said line through said object passthrough window as said line passes around said pulley while said pulley is rotating;
• wherein said housing structure encloses at least a portion of said pulley;
• wherein said wherein said circumferential groove opens into said object passthrough window object passthrough window;
• wherein said housing structure comprises a housing cover hingedly attached to a housing base via a hinged attachment, wherein said hinged attachment is configured to allow for the opening and closing of the pulley housing cover without disturbance of the pulley;
• and
• wherein said pulley is is operatively connected to a controllable motor.