Abstract: A sentry-post bollard has one or more divergent photo eye units mounted pivotally within the bollard which emit their beams horizontally and across the width the doorway of a high-speed industrial door or other motorized door. The sentry-post bollard may be used to open the door, hold it open, or both, when a vehicle or person is detected approaching the doorway. The sentry-post bollard may be used as a safety device throughout a facility. Placed at intersections, dock doors, ramp doors, etc., a safety beacon or siren can be activated to warn pedestrians of oncoming motorized traffic. The photo eye units project their beam(s) through a window slot extending circumferentially along the bollard and having a width of a nominal three-quarter inch.

Abstract: 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 a swing arm that extends radially from the pin's proximal end, and which engages retaining structure at the proximal end of the door lock frame. In the lock position the distal end of the sliding pin blocks movement of wheels or rollers in the vertical track. The arm is rotated out of engagement with the retaining structure to release the pin so it may slide proximally to an unlocked position. A microswitch in the interior of the lock switches on when the sliding pin is moved to the locked position and turns off when the pin is returned to its unlocked position. A sleeve disposed over the proximal part of the spring engages the actuator of the microswitch.

Abstract: 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.

Abstract: A combination dock light, safety light, and bollard serves the purposes of all three, without having any sensitive structure projecting out from the bollard into the traffic lane at the loading dock. A trailer lamp assembly within the bollard projects out a window cutout at an upper end of the tubular metal body of the bollard. A red/green safety light is visible through an elongated cutout on the proximal side of the bollard. A photo eye turns the lamp on when the loading dock door is opened, and off when the dock door is closed, and also switches the safety light to green or to red depending on whether the dock door is opened or closed.