Lock mechanism and door assembly

A door assembly for a vehicle having a door opening formed in or defined by a wall of the vehicle, the door assembly comprising:

• a door operator system configured to move at least one door along the door opening between open and closed positions;
• a lock mechanism configured to selectively lock the at least one door, comprising:
• a lock bracket connected to the door;
• a lock pin configured to be moved between an engaged position in which the lock pin is extended to engage the lock bracket and a disengaged position in which the lock pin is withdrawn from the lock bracket;
• and
• a linkage assembly connected to the lock pin and configured to be actuated to reversibly move the lock pin between the engaged position and the disengaged position;
• and
• a release device configured to disengage the lock mechanism and thereby to unlock the at least one door.

An isolation lock mechanism for a transit vehicle door, comprising:

• a lock bracket configured to be connected to the transit vehicle door;
• a lock pin configured to be moved between an engaged position in which the lock pin is extended to engage the lock bracket and a disengaged position in which the lock pin is withdrawn from the lock bracket;
• and
• a linkage assembly connected to the lock pin and configured to be actuated to move the lock pin between the engaged position and the disengaged position, wherein the linkage assembly is configured to be connected to an emergency release device such that operation of the emergency release device actuates the linkage assembly to move the lock pin from the engaged position to the disengaged position, and
• the linkage assembly comprises:
• a first arm configured to be connected to the emergency release device;
• a second arm connected to the first arm;
• a rotating shaft connected to the second arm;
• a cam fixedly connected to the rotating shaft;
• and a lever rotatably connected to the cam and the lock pin, wherein the second arm is connected to the first arm such that movement of the first arm due to operation of the emergency release device causes the second arm to rotate about a connection between the second arm and the rotating shaft, which causes rotation of the rotating shaft and the cam, wherein rotation of the cam causes rotation of the lever, and rotation of the lever causes linear motion of the lock pin between the engaged and disengaged positions.