Abstract: An actuator comprising a motor having a drive shaft, a spindle which is directly or indirectly driven by the drive shaft and which exhibits an axial recess being delimited by an internal limiting surface, said spindle comprising an internal thread arranged on the limiting surface, said thread having a predetermined axial extension, and a piston rod which is arranged in the recess to perform a translational movement relative to the spindle between a first end position and a second end position when the spindle is rotating, said end positions defining a length of stroke of the piston rod, said piston rod comprising a threaded portion which exhibits an external thread and has a predetermined axial extension, said external thread being adapted to interact with the internal thread of the spindle. According to the invention, the axial extension of the internal thread of the spindle is at least twice as long as the axial extension of the threaded portion of the piston rod.

Abstract: A float including at least two structural members, enclosing a cavity having a volume which is variable by means of a relative movement of the structural members, said relative movement resulting in a change of the buoyancy of the float. According to the invention, the float includes a volume which is intended to be filled with water through an opening when the float is immersed in water, as well as an evacuating duct through which air is intended to flow out of the volume when the water flows in through the opening.

Abstract: A lure for use when angling with a fishing rod and line. The lure has a first structural member and a second structural member, said structural members enclosing at least one cavity, having a volume which is variable by means of a relative movement between the structural members, said relative movement bringing about a change of displacement of the lure.