Inertial sensor, belt retractor and injection mold for molding a support and a sensor lever for an inertial sensor

The carrier (20) has a part-cylindrical surface (22). Its axis is parallel to the pivotal axis (A) and runs though the center of gravity of the mass (28) to which the extension (30) is attached. An Independent claim is included for an injection mold making the carrier for the inertia sensor described. Preferred features: The sensor lever (32) has a cylindrical surface (36), also parallel to the axis (A), to which the control latch (38) is fixed. The extension (30) has a longitudinal axis (L) at right angles to the pivoting axis (A), passing through the contact section (40) of the control latch when the sensor is released, so that the carrier can be fastened by means of the extension at various angles of rotation with respect to the longitudinal axis. The sensor lever (32) is pivotally-mounted on the carrier by a cylindrical peg with conical tip section engaging bores of similar section. The sensor lever has a cylindrical support surface, with ridges on the carrier, having a cylindrical outer contour, and slight offset from the support surface. Coding marks are made on the inertia sensor, indicating in which position the control latch is located on the sensor lever (32). In a seat belt roller employing the sensor (also claimed), a plate at the free end of the extension is held against rotation in a recess (58) in the casing (12). This unit is further detailed.