Abstract: A control system configured for safe input, visualization and/or communication for controlling a machine, includes a display device configured to display at least one symbol, an optical input device configured to detect, from the display device, at least a portion of the symbol, a redundant communication system configured to send the symbol, and a control unit configured to send the symbol and a test sequence to the display device, receive the symbol and the test sequence from the display device, test at least the test sequence, and, if the check sequence is correctly received, generate a redundant encoding of the symbol and send the redundantly encoded symbol over a redundant network.

Abstract: An electrical cable has ground wires for grounding or shielding the interior of the cable. Segments of the wires project from the cable and are uninsulated. A clamp for fixing the cable and connecting the ground wires to ground includes a plastic insulating sleeve which is slipped over the cable. The sleeve has an axial extension at one end and clamping fingers at the other end. The extension is provided with a resilient, generally annular circumferential projection and the sleeve is placed on the cable with the extension adjacent the uninsulated wire segments. The latter are bent onto the extension so as to overlie the projection. The extension and its overlying wire segments are inserted in an externally threaded, electrically conductive clamping collar. The internal diameter of that part of the clamping collar which surrounds the projection and its overlying wire segments is smaller than the outer diameter of the projection and its overlying wire segments.

Abstract: A fitting for engagement with the outer surface of a cable has a sleeve with an external thread adjacent one of its ends and a nut having a complementary internal thread at one of its ends. The one end of the sleeve is of one piece with or supports a tubular clamping device with an annulus of axially parallel flexible prongs alternating with elongated slots. The nut has a ring-shaped internal deforming surface which flexes the prongs radially inwardly toward the axis of the clamping device, and toward the outer surface of a cable extending through the sleeve and the nut, when the sleeve is threaded into the nut. The prongs have relatively thick portions which are remote from the sleeve and relatively thin, and hence more readily flexible, portions between the thick portions and the sleeve. The thick portions of the prongs can bear directly against the outer surface of a cable or against a deformable tubular seal which is placed between the prongs and the cable.

Abstract: A fitting for externally grooved and ribbed end portions of pipes, tubes, hoses and like tubular bodies has a tubular section and one or more circumferentially extending prongs each having one end integral with but pivotable relative to the section and a free second end. The inner side of each prong has one or more one-piece or composite circumferentially extending protuberances. In order to couple the fitting to the end portion of a tubular body, the free end of each prong is pulled radially outwardly to extract the protuberance or protuberances from the interior of the tubular section. The end portion of a tubular body is thereupon inserted into the section, and the prong or prongs are released to introduce their protuberances into the adjacent external groove or grooves of the inserted end portion. Each prong is surrounded by a substantially U-shaped slot of the tubular section to permit slight axial movements of the free end portion of the respective prong.

Abstract: A fitting for cables, tubes and like parts has an externally threaded sleeve one end portion of which is constituted by an annulus of deformable axially extending prongs alternating with slots. The radially outer ends of the slots are offset with reference to the radially inner ends in the same direction circumferentially of the sleeve. The nut of the fitting has an internally threaded end portion and a frustoconical deforming surface which deforms the prongs radially inwardly when the nut is screwed onto the sleeve. The deforming surface is provided with one or more male and/or female detent elements each having a blocking flank which engages an adjacent deformed prong in response to attempted unscrewing of the nut. The inclination of the blocking flank or flanks matches or approximates the inclination of the slots, at least when the nut meshes with and its internal surface deforms the prongs of the sleeve.