Abstract: An internal expanding shoe brake comprises expansion pistons (17) for forcing opposing brake shoes (2) apart. In each expansion piston (17) one adjusting pin (30) is axially movably arranged and presses against a brake shoe web (4) by means of a pressure piece (34). Said pressure piece (34) is supported on the adjusting pin by means of a ball joint so as to pivot in any direction. In order to prevent the adjusting pin (30) from being twisted inside the expansion piston (17), an anti-rotation element is provided and comprises a pressure piece projection (39) which projects over the ball joint surface (36) of the pressure piece (34), said projection interlockingly engaging in a receiving opening (40) of the adjusting pin (30) with lateral play and forming a rotational coupling connection.

Abstract: An actuating device for an internal expanding brake has a restoring device for manual adjusting and restoring of an adjusting pin relative to an expanding piston. The restoring device includes an actuating pin which is mounted rotatably in a housing and is configured for transmitting a torque which is applied manually to the actuating pin, and a restoring gear mechanism which has a first gearwheel which is coupled to the actuating pin and a second gearwheel which is coupled to an adjusting nut. The first gearwheel of the restoring gear mechanism which is coupled to the actuating pin can be displaced in the axial direction of the actuating pin and can be brought into and out of torque-proof engagement with the actuating pin by means of a coupling device in a manner which is dependent on the transmitted torque.

Abstract: The invention relates to an actuating device for an internal shoe brake, including an automatic adjusting device with an adjusting lever which includes a guide track in the form of a guiding slot with two opposing track surfaces which cooperate with opposing sides of a housing-fixed guide element in order to convert a displacement of the adjusting lever relative to the housing-fixed guide element into pivoting movements of the adjusting lever.