US Patent 9187931 Sliding pin lock mechanism for overhead door

A door lock mechanism for an overhead door employs a sliding pin or rod that passes into the path of the rollers in the track, and obstructs the roller from movement in the direction to open the door. A spring in the door lock frame biases the sliding pin towards a proximal open position. The sliding pin has an arm that extends radially from its proximal end, and which engages retaining structure at the proximal end of the door lock frame. The arm is rotated out of engagement with the retaining structure to release the pin so it may slide proximally to an unlocked position. The pin may slide into a receiver housing mounted on a door panel.