Abstract: A rotary mechanism for converting a reciprocal linear motion into an oscillating rotary motion with increased torque at the end positions. Two pressurized air cylinders 1,2 co-operate via links 14, 15 with a common lever arm 5 fastened to an output shaft. The cylinders provide an increased torque adjacent to each one of the end positions of the rotary motion.

Abstract: A force amplifying displacement device for displacement of an object (5) a predetermined distance relative to a frame (2) or the like, wherein a first, longer part of the displacement movement requires a relatively minor force, while a second, shorter part of the movement requires a substantially greater force. The device comprises a lever mechanism (13) active between the frame (2) and a power transmission rod (17). An operating unit (9), e.g. consisting of a pressurized fluid cylinder (10), piston (11) and piston rod (12), first operates directly between the object (5) and the frame (2,22) and, thereafter, by sensing the end portion (28) of the power transmission rod (7), by way of the lever mechanism (13), so that a strongly amplified force is applied to the power transmission rod (7) and the object (5).

Abstract: The invention relates to a method and a device for detecting discontinuities in materials by means of probes sensitive to said discontinuities. According to the invention the material (1) is scanned preferably in the form of a web, by at least two probes (2, 6) which during the scanning sequence are moved above the material (1) in circular paths (3) and (7) in a geometrical plane which is essentially parallel to the geometrical plane of the material web. The circular paths have essentially equal radii and at least one first circular path (3) is arranged in front of a second circular path (7) and is displaced sideways in relation to the second path in such a way that essentially every surface element of the material web is successively covered by at least two circular paths (3) and (7) with such an overlapping that every half-circle segment is sideways overlapped by a consecutive half-circle segment, all seen in the travel direction of the material web.

Abstract: Discontinuities in metallic objects are detected by a conductor generating a magnetic field in the objects and probe means sensitive to the magnetic field and disturbances therein caused by the discontinuities.