Automatic lock for cargo container

A cargo container, comprising:

• a closable vessel for stowing cargo during transportation;
• a plurality of upper corner fittings secured to an upper surface of said vessel for allowing stacking of a second cargo container thereon;
• a plurality of bottom corner fittings secured to a lower surface of said vessel, each of said bottom corner fittings including:
• a) a substantially rectangular body defining a lower mating edge, said lower mating edge defining a plane P, and wherein said body defines a first opening extending through said lower mating edge, said first opening defining opposing first and second sidewalls;
• b) an automatic locking mechanism positioned within said first opening of said body, said automatic locking mechanism including:
• i) first and second locking arms having first and second ends respectively, said first end of said first locking arm being pivotally attached to said first sidewall of said first opening and said first end of said second locking arm being pivotally attached to said second sidewall of said first opening;
• ii) first and second rollers, said first roller being positioned at said second end of said first locking arm and said second roller being positioned at said second end of said second locking arm;
• iii) first and second operating springs, said first operating spring cooperating with said first end of said first locking arm to resist counterclockwise rotation of said first locking arm about said first end thereof, said second operating spring cooperating with said first end of said second locking arm to resist clockwise rotation of said second locking arm about said first end thereof;
• and
• iv) first and second locating springs, said first locating spring cooperating with said first end of said first locking arm to bias said first locking arm to a first at-rest orientation, said second locating spring cooperating with said first end of said second locking arm to bias said second locking arm to a second at-rest orientation;
• and wherein said locking arms extend downward from said body portion and through said plane P in an X-shaped pattern when said first and second locking arms are located in said at-rest orientations such that said second ends of said locking arms are located to engage an adjacent corner fitting.