The invention relates to an actuating unit (14) having an actuating element (15), in particular to a closing drive for a motor vehicle lock, comprising a drive unit, a housing (18, 19), a spindle nut (16), and a spindle (15), wherein the spindle nut (16) is accommodated in the housing (18, 19) of the actuating unit (14), and a Bowden cable (20), wherein the Bowden cable (20) is connected to the spindle (15), wherein the spindle (15) has a stop (21), which interacts with the spindle nut (15), such that the travel of the spindle (15) can be limited.

A multifunctional strengthened lock structure includes a case and a bolt control unit and a strengthened triangular latch unit arranged in the case. The bolt control unit includes an own-axis rotating plate, a first push plate, a second push plate, a butterfly plate and a first spring, a second spring, and a pressing member, and an arc arrestor. When a lock-cylinder rotating axle is rotated to close, the own-axis rotating plate is rotate to the closed position, and the second push plate is inoperable due to the butterfly plate being pushed to an idle position so as to serve as a blocking plate for the handle rotating axle, thereby achieving a dual-locking effect. A triangular latch includes a latching head, a rod pivotally connected to the latching head, a strengthening ring fit over the rod, and a strengthening screw fastened to the latching head and the rod.

The invention relates to an actuating unit (14) having an actuating element (15), in particular to a closing drive for a motor vehicle lock, comprising a drive unit, a housing (18, 19), a spindle nut (16), and a spindle (15), wherein the spindle nut (16) is accommodated in the housing (18, 19) of the actuating unit (14), and a Bowden cable (20), wherein the Bowden cable (20) is connected to the spindle (15), wherein the spindle (15) has a stop (21), which interacts with the spindle nut (15), such that the travel of the spindle (15) can be limited.

In one or more arrangements, a quarter turn lock is presented having a locking shaft 3 rotatably mounted in a lock housing 2 and a spring securing device 4 for securing the locking shaft against unintentional rotation relative to the lock housing in at least one rotational position, wherein the spring securing device 4 has a spring 5 and a securing element 6 interacts with the lock housing 2 in a latching manner.