Linear Actuator
AssigneeLinak A/S
InventorAnders Lykkegaard
Life of this patent
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Abstract
A linear actuator of the type whose function is based on a spindle (3) and a main nut (4), is provided with a safety nut (7) in connection with the main nut. The flank (9) of the safety nut closest to the load is made steep, i.e. forms an acute angle with its longitudinal axis, thereby providing a great frictional force by engagement with the threads of the spindle in the event that the main nut fails. The great frictional force is brought about in that the threads of the spindle, exclusively with the outer edge, get into linear engagement with the steep flank on the safety nut.
Claims5
A linear actuator comprising a spindle (3) provided with external threads, a main nut (4) provided with internal threads and in engagement with the threads of the spindle, a safety nut (7) arranged in connection with the main nut (4) and provided with internal threads adapted such that, in case of an intact main nut, it is not in carrying contact with the threads of the spindle, said threads of the safety nut having a first flank (8) intended to engage the threads of the spindle in the event that the carrying capacity of the main nut fails, characterized in that the second flank (9) of the safety nut (7) is steep, i.e. forms an acute angle with the longitudinal axis of the nut.
Dependencies are inferred from the claim text.