A door of a vehicle includes a door body coupled to a vehicle body. The door body is movable relative to the vehicle body between an open position and a closed position. The door further includes a latch movable relative to the door body between a latched position and an unlatched position. The latch is configured to secure the door body in the closed position when the latch in the latched position. An actuator is supported by the door body and operable to move the latch from the latched position to the unlatched position, and a push button actuator is supported by the door body and operable to move the latch from the unlatched position to the latched position. The push button actuator is operable to move the latch from the latched position to the unlatched position without operating the actuator.

An actuating system for an actuatable door and to an actuatable door having such an actuating system are provided. The actuating system comprises first and second rotatable latching shafts, a coupling link, first and second pivotable mechanical transmission elements that are mounted onto first and second rotatable latching shafts, respectively, and first and second latching members. First and second latching members are non-rotatably mounted to the second rotatable latching shaft and adapted for latching the actuatable door in a closed position. A first rotation of the first rotatable latching shaft results in pivoting of the first and second mechanical transmission elements and a second rotation of the second rotatable latching shaft, which causes a third rotation of first and second latching members.

A door latching mechanism for a tank door. The mechanism includes a rotating shaft with integral tabs. A central tab rotates in response to actuation by a cylinder or other actuator. Outwardly disposed tabs are rotatably connected to hooks which have a specific geometry, allowing them to latch onto shackles on the side of the tank. When latched, the tab's orientation is over center, such that positive force is not needed to maintain the tank in the latched position. The hooks may be concave up or concave down depending upon the geometry of the remainder of the latching mechanism. When unlatched, a single powered hinge may allow the tank to be open, and gravity assists with the disposal of spoils contained therein.