A device for belt force and Gurtbenutzungserkennung

The invention relates to a buckle (8) for receiving a fastening element (2) of a safety belt (1) with an insertion opening (10) for the fastening element (2). In the buckle (8) is a one locking opening (3) on the fastening element was added (2) by releasing closure element (20). The closure element (20) is arranged on a leaf spring-like support (17), via which a retraction (24) of the closure (20) into the locking opening (3) of the fastening element (2) when it passes through the insertion of the fastening element (2) actuates a locking lever (12). The retraction (24) of the closure element (20) is monitored over a containing a magnetic field-sensitive sensor (31) magnetic circuit (16). A the fixing element (2) of the safety belt (1) fixing component (11, 20) of the buckle (8) is associated with a measuring element (20) with which through the magnetic circuit (16, 31) detects an acting on the buckle strength can.