Abstract: A door drop stop safety system which is adapted to be installed on existing building overhead doors which employ a central axle; slab doors, bifold doors, and rollup doors which contains structure for raising and lowering the the door including a rewind box including an inertia reel and a length of strap. The inertia reel allowing normal motion, but is adapted to lock as soon as a predetermined rate of rotation is reached due to the door beginning to free fall. The system includes structure means for mounting the rewind box on an existing door, including slab doors, bifold doors, and rollup doors.

Abstract: The present invention is a door drop stop system designed to require a minimal amount of time and modification to install in an existing door system. It is effective with all overhead doors which employ a central axle; such overhead doors are in widespread use in residential, commercial, and vehicular applications. In addition, other configurations of the door drop stop system are effective with slab doors, bifold doors, and rollup doors. The present invention will reduce or eliminate property damage and personal injury resulting from a failure of a component of the door or its counterbalance system.

Abstract: The present invention is a device which is designed to allow a door to give way when impacted by an outside force such as a forklift, reducing damage. The present invention requires less force to be activated, which allows its use on wider doors than were previously possible. The present invention is also able to reset itself, depending upon how much distance was traveled during the impact. The present invention requires less maintenance than other devices currently in use.

Abstract: The present invention is a device which is designed to allow a door to give way when impacted by an outside force such as a forklift, reducing damage. The present invention requires less force to be activated, which allows its use on wider doors than were previously possible. The present invention is also able to reset itself, depending upon how much distance was traveled during the impact. The present invention requires less maintenance than other devices currently in use.

Abstract: The present invention is a door drop stop system designed to require a minimal amount of time and modification to install in an existing door system. It is effective with all overhead doors which employ a central axle; such overhead doors are in widespread use in residential, commercial, and vehicular applications. In addition, other configurations of the door drop stop system are effective with slab doors, bifold doors, and rollup doors. The present invention will reduce or eliminate property damage and personal injury resulting from a failure of a component of the door or its counterbalance system.