Abstract: A chain-like conveyor device (6) for protecting accommodation and controlled guidance of flexible cables/hoses/lines extending between a stationary unit, e.g. a fixed production platform (1), and a unit, e.g. a derrick (5), displaceable in relation thereto and movable in at least two directions (P1,P2) intersecting each other, wherein the displacement movements take place in parallel planes, e.g. horizontal planes, and wherein the conveyor device (6) mainly comprising interhinged chain link-like conveyor carriage members (6'), has a first stationary end (6") and a second end (6'") coupled (at 7') to the displaceable unit (5), so that the second end (6'") is brought to follow the displacement movements of the displaceable unit (5) in said planes, e.g. horizontal planes. The pivot axes (32') for the interhinged single members (6') extend perpendicular to said planes, e.g. horizontal planes.

Abstract: A noise immune voltage comparator with controlled hysteresis characteristics. The hysteresis gap thereof is adjustable from positive down to negative voltage values, zero volt included and in all cases a safe bistable function is maintained. The comparator is realized with two amplifiers each provided with positive feedback and each supplied with a difference voltage which is the difference between the voltage subjected to comparison and a reference voltage, the output signal from one of the amplifiers, after multiplication with a factor that may be greater than zero, zero or less than zero, being combined with the input voltage of the other amplifier.