Abstract: An improved structure of a connecting joint used for a case. The connecting joint has a substantially right-angled connecting element provided with a plurality of elongated insertion blocks which engage compartments formed in a hollow insertion plate. An expansion block is inserted at one end into a vertical slot formed by the arrangement of a plurality of the elongated insertion blocks, and the other end thereof is inserted into the compartments formed in the hollow insertion plate. The expansion block has a slot therein that engages a wall of the hollow insertion plate.

Abstract: A numerical lock includes a housing having a hooking member, a cover, a plurality of numerical wheels, a plurality of sleeves, a control rod having a head, a numerical-changing piece having a pushing member, and a pivotally mounted locking piece capable of engaging with the head to slide the control rod in the lock.

Abstract: An adjustable combination numerical lock comprising a hook, a first tray, a second tray, a contact chip, two or more number dials, springs and driving rolls. The number dials, the springs, and the driving rolls are respectively set in the second tray, and the hook wedged with the contact chip is put on the two trays. When this lock is locked, the sliding strips do not engage with the recesses of the driving rolls, thereby allowing the driving rolls to rotate with the number dials. Therefore, the sliding strips will be prevented from sliding up if the combination is off. When the numbers are put into the right combination, the lock is opened and the sliding strips are partly engaged with the recesses so that the hook can be pulled up. The combination of the lock can be changed (while in opening combination) by turning the hook right 90 degrees and then pulling it up so that the sliding strips are completely engaged with the recesses. This keeps the driving rolls from rotating with the number dials.

Abstract: A combination lock for a briefcase, comprises a case body, a push button, a plurality of combination dials, a plurality of driven wheels, a sliding sheet, a positioning sheet, a sliding block, a structural body, a back cover, and a plurality of springs, wherein the combination is changeable, and the combination dials are arranged non-axially so that the lock is simple in structure, easy to operate, and small in size. This lock is especially suitable for a briefcase.

Abstract: A combined combination and key-type lock has both a combination lock and a key-type lock, either or both of which may be used. The combined combination and key-type lock is designed so that it can still be opened without dismantling the compound lock and the correct numbers of the combination lock can be detected even if the correct numbers of the combination lock is forgotten.