Door drive system

A door drive assembly for a bus provided with a body defining an opening and a door configured to move away from and along the body, the door drive assembly comprising:

• a drive arm including a first end configured to be rotatably coupled to the body and a second end;
• a control arm including a first end configured to be rotatably coupled to the body and a second end;
• a door attachment bracket pivotally attached to the second end of the drive arm and the second end of the control arm;
• a drive mechanism coupled to the drive arm and configured to rotate the drive arm so that the door attachment bracket moves from a closed position to a first open position and from the first open position to a second open position;
• and
• a race configured to be disposed between the body and the first end of the control arm, wherein,
• when the door attachment bracket is in the closed position, the first end of the control arm contacts a first end of the race,
• when the door attachment bracket is in the first open position the door attachment bracket is spaced apart from the body, and
• when the door attachment bracket is in the second open position, the first end of the control arm is spaced apart from the first end of the race.

A bus including a door and a body defining an opening, the bus comprising:

• a drive arm including a first end configured to be rotatably coupled to the body and a second end configured to be rotatably coupled to the door;
• a drive mechanism coupled to the drive arm and configured to rotate the drive arm between an open position and a closed position;
• a control arm including a first end configured to be rotatably coupled to the body and a second end configured to be rotatably coupled to the door;
• and
• a race configured to be disposed between the body and the first end of the control arm wherein the first end of control arm is configured to translate by a first distance along the race to move the control arm towards the drive arm to increase a pitch of the second end of the control arm as the drive arm rotates between the open and closed positions.