Patent ID: 6301983
Filing Date: 2001-10-16
Classification: B23Q,F16H,Y10T

Abstract:
A device in linear actuators comprisinga carriage 1, guided for displacement in the longitudinal direction of a rotatable threaded spindle (3) in screw engagement with the carriage (1),said spindle extending freely through a screw support (2, 17, 18, 20, 21, 22, 23), at least at one side of the carriage (1),said screw support arranged to serve as a bearing supporting the spindle (3) between points of support (15, 16) located at the ends of the spindle (3), the carriage (1) and the screw support (2, 17, 18, 21, 22) are provided with interacting locking means (4, 5, 6, 7, 8) arranged, for the purpose of interconnecting the carriage (1) and the screw support (2, 17, 18, 20, 21, 22,) to interengage as soon as the carriage (1), while being moved in response to the rotation of the spindle (3), reaches the screw support (2, 17, 18, 21, 22) and starts bringing along said support in its movement, and in that means (11, 19, 28, 29) being arranged, upon reverse movement of said carriage (1) and said screw support while in their interconnected condition, to release said carriage (1) from said screw support (2, 17, 18, 21, 22) as said carriage and support pass said means (11, 19, 28, 29) and at the same time to secure said screw support in the position it has attained by having been thus displaced by the carriage,the locking means of the carriage (1) consists of a connecting rod (4) projecting from the carriage (1) in the longitudinal direction of the spindle (3) and supporting a locking washer (5) at its free end, and in that the locking means of the screw support (2, 17, 18, 20, 21, 22, 23) consists of a rocker arm (6) which is located at one side of the screw support and which is pivotally connected to a blocking arm (7), said arm being displaceable in its longitudinal direction transversely of the screw support (2, 17, 18, 20, 21, 22, 23) and being formed with a stop portion (8), in thatthe locking washer (5) of the connecting rod (4) is arranged, for the purpose of interconnecting the carriage (1) and the screw support, to move past the stop portion (8) of the blocking arm (7) upon movement of said carriage (1) to a position adjacent said screw support, and in thatsaid rocker arm (6) is arranged, upon the continued movement of the carriage (1) and the screw support (2, 17, 18, 20, 21, 22, 23) in the same direction, to displace the blocking arm (7) in the longitudinal direction thereof to a position in which said stop portion (8) is caught behind the locking washer (5), as seen in the direction of movement.