Tamper-resistant security lock for cargo container doors

A security lock assembly for preventing unauthorized opening of doors to containers having lockrods for locking the doors closed, wherein at least one door has an edge movable with respect to another member to form a door opening, comprising:

• a pair of telescopically adjustably interconnected J-shaped hasps each having a hook member on one end for close fitting encircling relationship with a respective lockrod, and having an elongate rectangularly shaped body extending from the hook member toward an opposing lockrod, wherein the lockrods are spaced on opposite sides of the door opening, to thereby hold the lockrods toward one another and prevent opening of said door;
• each hasp having a plurality of openings formed therethrough in positions to be in registry with one another when the hasps are adjustably interconnected;
• staple means pivotally carried by one of the hasps and including a portion for extending through a pair of openings in the two hasps when those openings are in registry with one another in an adjusted position of the hasps, to thereby secure the hasps in their adjusted position;
• the openings in one of the hasps being spaced closer together than the openings in the other hasp, with the differently spaced openings in the two hasps defining a vernier adjustment, whereby smaller increments of adjustment can be obtained than if the openings were equally spaced;
• and
• lock means for engagement on said staple means behind said hasps, between the hasps and said door, to lock the hasps in their telescopically adjusted position and prevent opening of the door.

A security lock assembly for preventing unauthorized opening of doors to containers having lockrods for locking the doors closed, wherein at least one door has an edge movable with respect to another member to form a door opening, comprising:

• a pair of adjustably interconnected hasps having means thereon for connection with a pair of lockrods spaced on opposite sides of the door opening to hold the lockrods toward one another and prevent opening of the door;
• said hasps each having a plurality of openings therethrough adapted to be placed in registry with one another in adjusted positions of the hasps;
• staple means connected by pivotal support means on one of the hasps for pivotal movement between a first position with the staple means extended through an aligned pair of said openings to hold the hasps in adjusted position, and a second position withdrawn from said aligned openings so that said hasps may be moved longitudinally relative to one another to release the lockrods and permit opening of the door, said staple means including a first portion which extends through said aligned openings and a second portion extending angularly from the first portion to said pivotal support means;
• and
• said second portion of said staple means being connected to said pivotal support means through a connection that is designed to fail before the first portion fails or is withdrawn from the openings when a pry bar or hammer or other tool is used in an effort to break said security lock, to thereby prevent disengagement of the first portion from the openings and thus prevent relative longitudinal sliding movement of the hasps.