US Patent 9546507 Safety bolt device and system

A safety bolt device comprising: a drop down bolt, the drop down bolt comprising: a cross-member; a first vertical pin attached to a first end of the cross-member; a second vertical pin attached to a second end of the cross-member; a door receiver configured to receive the first vertical pin, the door receiver comprising: a bolt; a jamb receiver configured to receive the second vertical pin, the jamb receiver comprising: a pin; where the door receiver is configured to attach to a door, and the jamb receiver is configured to attach to the door jamb of the door, and where the safety bolt device is configured to prevent the door from being opened when the drop down bolt has been dropped into the door receiver and the jamb receiver.