Lock for movable freight container cargo door

A locking system wherein:

• the locking system is configured for permanent attachment to a movable freight container cargo door;
• the locking system comprises a lock body and a straight shackle;
• the straight shackle comprises a head end, a tip end, and a shaft;
• the straight shackle is configured for sliding into and out of at least a portion of the lock body;
• the lock body is c-shaped, comprising a lock body first portion, a lock body second portion, and a lock body base portion wherein:
• the lock body first portion and the lock body second portion are connected to two ends of the lock body base portion to form the c-shape of the lock body;
• the lock body base portion is configured for permanent attachment to the movable freight container cargo door;
• the lock body first portion and the lock body second portion are separated by a movable freight container cargo door handle retention region;
• and
• the movable freight container cargo door handle retention region is located on the side of the c-shaped lock body opposite of the movable freight container cargo door;
• the movable freight container cargo door handle retention region comprises a recess of the c-shaped lock body between the lock body first portion and the lock body second portion;
• the lock body first portion comprises an aperture configured for axially sliding at least a portion of the straight shackle into and out of the lock body;
• the lock body second portion comprises a cavity for holding the tip end of the straight shackle when the straight shackle is fully inserted into the lock body;
• the system is configured for:
• locking the movable freight container cargo door when:
• the straight shackle is inserted into the aperture;
• the straight shackle spans across the handle retention region;
• at least part of the movable freight container cargo door handle is captured in the handle retention region between the straight shackle and the lock body base portion;
• and
• the tip end of the straight shackle is inserted into the cavity of the lock body second portion;
• and
• releasing the handle when the straight shackle does not span across the handle retention region;
• and
• the straight shackle comprises a shackle groove configured for engagement with a shackle lock element located in the lock body, wherein:
• the shaft of the straight shackle cannot be moved to a position that would allow the moveable freight container cargo door handle to be released when the shackle lock element is engaged with the shackle groove;
• the shackle groove is perpendicular to the axis of the shaft of the straight shackle in a direction that prevents axial movement of the straight shackle when the shackle lock element is engaged with the shackle groove;
• the shackle lock element is configured for linear motion in a direction perpendicular to the shaft of the straight shackle and perpendicular to the shackle groove;
• the shackle lock element is responsive to a rotating lock cylinder attached to the lock body.