LIGHT SIGNALLING DEVICE FOR THE BOW OF A SHIP

Light signalling device (10) for the bow of a ship, comprising a light signalling means (L) and a supporting structure (11) of said light signalling means (L), wherein: - said structure (11) comprises a fixed rigid tubular sleeve (11.1) and a plurality of tubular sections (15.1, 15.2, 15.3), which are coupled to slide telescopically into one another and with respect to said sleeve (11.1), so as to selectively take a first operating arrangement with minimum overall dimensions, in which said tubular sections (15.1, 15.2, 15.3) are telescopically retracted inside said sleeve (11.1), and a second operating arrangement, in which said tubular sections (15.1, 15.2, 15.3) are telescopically extended with respect to one another and to said sleeve (11.1) and the signalling means (L) is in the condition of maximum visibility with respect to the bow of the ship on which the device (10) is mounted, and wherein: - said sleeve (11.1) is integral with respect to a stationary internal base support plate (11.2), which is provided with a through hole; - said base support plate (11.2) supports a first rotating shaft (12), hereinafter drive shaft, the axis of which is oriented along the direction of telescopic extension/retraction of said tubular sections (15.1, 15.2, 15.3); - said drive shaft (12) has a first axial end (12.1) extending below said base support plate (11.2), through said through hole, connected to a toothed wheel, which meshes with a reduction means, connected with respect to the output shaft of electric motor means (M); - said electric motor means (M) are supported by means of said base support plate (11.2) and are configured to rotate in the two directions of rotation; - said drive shaft (12) has a second axial end (12.2) extending above said base plate (11.2) and rigidly connected to one end of a first externally threaded coaxial operating screw (13.1), extending for a substantial part of said structure (11); - said first operating screw (13.1) has a longitudinal key groove extending for at least part of its length. [0002] The device (10) further comprises: - first translating plate supporting means (14) provided movable with respect to said first operating screw (13.1), above said base support plate (11.2), which comprise: - a first supporting plate (14.1), arranged inside said sleeve (11.1) and which comprises, in a through hole, a first lead screw (14.2) integral with said first plate (14.1) and engaged by helical coupling with respect to said first operating screw (13.1); - a first pinion (14.3) fitted on said first operating screw (13.1), below said first lead screw (14.2), which is provided integral in rotation and axially sliding with respect to said first operating screw (13.1), by means of connection key means, provided sliding in said longitudinal groove of said first operating screw (13.1); - a second shaft (14.4), hereinafter first driven shaft, supported rotatably, arranged laterally and with axis parallel with respect to the axis of said drive shaft (12), in a corresponding through hole of said first supporting plate (14.1), wherein said first driven shaft (14.4) has: - a first axial end (14.5) extending below said first supporting plate (14.1) and rigidly connected to a second pinion (14.6), coaxial to said shaft and meshing with said first pinion (14.3), from which it receives its rotation motion; - a second axial end (14.7) extending above said first supporting plate (14.1) and rigidly connected to one end of a second externally threaded coaxial operating screw (13.2), extending for a substantial part of said sleeve (11.1), when said tubular sections (15.1, 15.2, 15.3) are in said first operating arrangement; - a first telescopic tubular section (15.1), fixed with a lower end area with respect to said first supporting plate (14.1) inside said sleeve (11.1) and extending for a substantial part of the height of said sleeve when said tubular sections (15.1, 15.2, 15.3) are in said first operating arrangement; - said second operating screw (13.2) having a longitudinal key groove extending for at least part of its length; and - at least second translating plate supporting means (16) provided movable with respect to said second operating screw (13.2), above said first supporting plate (14.1), which comprise: - a second supporting plate (16.1), arranged inside said sleeve (11.1) and which comprises, in a through hole, a second lead screw (16.2) integral with said second plate (16.1) and engaged by helical coupling with respect to said second operating screw (13.2); - a third pinion (16.3), provided below said second lead screw (16.2), integral in rotation and axially sliding with respect to said second operating screw (13.2), by means of connection key means, provided sliding in said longitudinal groove of said second operating screw (13.2); - a third shaft (16.4), hereinafter second driven shaft; supported rotatably, arranged laterally with respect to said first driven shaft (14.4) and with axis parallel with respect to the axis of said drive shaft (12), in a corresponding through hole of said second supporting plate (16.1), wherein: - said second driven shaft (16.4) has a first axial end (16.5) extending below said second supporting plate (16.1) and rigidly connected to a fourth pinion (16.6), coaxial to said shaft and meshing with said third pinion (16.3), from which it receives its rotation motion; - a second telescopic tubular section (15.2), fixed with a lower end area with respect to said second supporting plate (16.1) inside said sleeve (11.1) and extending for a substantial part of the height of said sleeve (11.1), when said tubular sections (15.1, 15.2, 15.3) are in said first operating arrangement.