Abstract: A lock for an automatic vending machine including the combination of a bolt-and-nut locking mechanism and a slide locking mechanism. The bolt-and-nut locking mechanism includes a bolt movably mounted to the door of the vending machine to permit an associated handle to push and insert the bolt in a female-threaded hole of a nut on the casing body of the vending machine for locking at an intermediate level of the door of the vending machine. The slide locking mechanism includes a slide plate which is responsive to rotation of the bolt for sliding longitudinally until the slide plate has been caught by catching means on the casing body of the automatic vending machine, thereby locking the door to the casing body of the vending machine at upper and lower levels.

Abstract: A locking device is disclosed which comprises a multi-leaved key which is adapted to be inserted within a correspondingly configured keyhole provided within an inner cylinder member. The inner cylinder member is slidably disposed within an outer cylinder member so as to permit or prevent rotation of the inner cylinder member with respect to the outer cylinder member through the interaction between a projection member and a slot or groove respectively provided upon the inner and outer cylinder members, as well as to permit or prevent the inner cylinder member from being engaged with a cam member which is operatively associated wih a lock bolt.

Abstract: Disclosed is a locking device having an inner lock cylinder axially slidable in a recess in the lock housing. Tumbler means prevent relative motion between the cylinder and the housing until the axial insertion of a key with a double set of notches. Upon insertion thereof, the cylinder may be axially displaced only by pressure against the key to actuate the lock release.