Patent ID: 6684988
Filing Date: 2004-02-03
Classification: F16D

Abstract:
An actuator for a drum brake, comprising:a housing (1), a screw mechanism (2) comprising at least one screw (3) and a first nut (4), wherein the screw mechanism is supported with respect to the housing (1), and drive means (5) that are drivingly connected to the screw mechanism (2) for providing a linear movement of the at least one screw (3) and the first nut (4) with respect to the housing (1) upon driving the screw mechanism (2), wherein the screw mechanism (2) further comprises two axially aligned screws (3, 6) which have opposite lead angles, and two corresponding nuts (4, 7), each of the two axially aligned screws (3, 6) engages a respective nut of the two corresponding nuts (4, 7) with the at least one screw (3) engaging the first nut (4), the drive means (5) are connected to both of the two axially aligned screws (3, 6) or to both of the two corresponding nuts (4, 7), the housing comprises a cylindrical tube (1), the two corresponding nuts (4, 7) having a corresponding cylindrical circumference and fitting slidably within the cylindrical tube (1), and the drive means comprise a disc (5) which is drivable through an opening (12) in the cylindrical tube (1).