Patent ID: 8016328

Claim:
A locking device for the door of an apparatus comprising a rotary drum, said locking device comprising a latch which is pivotingly mounted on a moving leaf of said door, and a control box which is attached to a fixed frame of the door, said control box having a passage to receive therethrough a first tip of said latch by a pivoting movement of the latch when said moving leaf is put in a closed position, and an immobilizing device operated by an electrically or electronically controlled actuator to immobilize said first tip of the latch in a coupled position in said passage in response to a signal from a detection device representative of the latch in said coupled position, the control box controlling functions of said apparatus depending on the position of the first tip, wherein the latch comprises a second tip configured and arranged to move together with said first tip and to couple in a retaining stop attached to said fixed frame by virtue of said pivoting movement of the latch substantially at the same time the first tip is received and locked in the passage of the control box, thereby said second tip of the latch is retained in a coupling position coupled to said retaining stop by the first tip when the first tip is immobilized in its coupling position by the control box, and thereby the first tip of the latch acts primarily as a control tip and the second tip acts as a coupling tip.