Abstract: A locking system comprising a housing, first and second lock cylinders each including a disk having an extension, each of the disk being rotated by a suitable key, a thrust bar having notches to receive the extensions and having a locking position for which the extensions are engaged in the notches, the thrust bar being movable when the disks are rotated simultaneously so that the extensions move out of the notches, means to maintain the extensions in the notches when the thurst bar is in its locking position, and means to urge the thrust bar to its locking position.

Abstract: A device is disclosed which is mounted to a door over an independently mounted lock to prevent separation of the lock from the door. In one embodiment, the device comprises an interior plate having a recessed portion and flange portions, which is fastened to the interior of the door by bolts passing through the door with the recessed portion covering the lock. The plate holds the lock against the interior of the door and prevents its separation from the door when forces are applied to the lock from the exterior of the door via the lock cylinder or directly to the lock after the cylinder has been removed. In another embodiment, the device also comprises an exterior plate mounted to the exterior of the door covering the heads of the bolts used to mount the interior plate to the door.

Abstract: A collapsible shopping cart where a specially made high rear traverse of the box, serves as a handle for the shopping cart. The legs of said handle are connected by means of rings with the usual traverse of the shopping cart and as a result, when the box is opened, said handle is placed above the traverse of the shopping cart, which increases its length and lightens the moving of the loaded shopping cart.

Abstract: Protective apparatus for a lock and a lock including such apparatus are disclosed. The protective apparatus comprises a plate-like element adapted to be added to a standard lock without requiring any mounting structure not already present in the lock. A spring causes the plate-like element to move or pivot when the connecting bar of the lock is removed to block the opening through which the lock connecting bar extends into the housing. Thereby, the plate prevents insertion of a tool such as a screwdriver into the lock. In some embodiments, the protective apparatus locks the bolt when the connecting bar is removed.