Sliding pin lock mechanism for overhead door with microswitch

A locking mechanism that has a proximal end and a distal end that is adapted to attach to a flat outer web of the vertical track of an overhead door to hold the door locked in its lowered or closed position, the overhead door having a plurality of rollers that travel vertically within the vertical track, the mechanism comprising:

• a frame, including a distal mounting portion that is adapted to be affixed onto the flat outer web of said vertical track, the frame extending proximally away from the flat outer web of the vertical track;
• a sliding pin that passes in a proximal-distal direction through an opening in the distal mounting portion of the frame, and is configured to penetrate the flat outer web portion of said vertical track so as to block travel of the rollers when the pin is extended distally into the track, with said sliding pin having an arm affixed onto and extending radially, in respect to the axis of said sliding pin or dowel, from a proximal end of said sliding pin, the sliding pin being free to rotate at least a limited amount when said arm is moved;
• a spring contained within said frame and urging said sliding pin in a proximal direction away from said vertical track;
• retaining structure at a proximal end of said frame for engaging said radial arm when the sliding pin is slid distally toward said vertical track to a locked position, and the radial arm being capable of being rotated out of engagement with said retaining structure to permit the pin to slide proximally to an unlocked position wherein the spring urges the sliding pin away from and out of contact with the rollers in said vertical track;
• an electrical microswitch mounted within said frame, and having a switch actuator thereon which is movable between a first condition in which the microswitch is in one of an ON state and an OFF state and a second condition in which the microswitch is in the other of said states;
• and
• a switch actuating member affixed onto a portion of said sliding pin and engaging said switch actuator to urge the latter to its second condition when the sliding pin is slid distally to its locked portion to lock said overhead door, and which moves out of engagement with said switch actuator when the sliding pin is slid proximally from its locked position, the moving of the arm out of engagement with the engaging structure and proximal motion of said sliding pin serving to permit the switch actuator to return to its first position.