A swing bridge for the spanning of watercourses

Abstract: The swing bridge (1) defined by a first bank (4) and by a second bank (6) on which there are tracts of road surface (24, 26) is constituted by a first mobile plane (2) restable, at its first end (21) on the said first bank (4) and is supported, at its other end (22) in proximity to the said second bank (6) with possibility of free rotation about its vertical axis (Z) passing through its own longitudinal axis of symmetry (Y) and defining by a vertical hinge pivot (5); the second end (22) of the said mobile plane (2) being hinged about its horizontal transversal axis (X) to the said hinge pivot (5) and having hinged to itself a connecting plane (7) of the mobile plane (2) with the second bank (6); between the mobile plane (2) and the connecting plane (7) there being envisaged movement organs (20) of the said connecting plane (7) and the mobile plane (2) bearing inferiorly at least one floating hollow body (8) with adjustable trim which raises or lowers the said first end (21) and nautical propulsion organs (9) which move the said mobile plane (2) in rotation about the said hinge pivot (5) after the said mobile plane (2) and the said connecting plane (7) have been raised from the said banks (4 and 6).

Description: The invention relates to a swing bridge for the spanning of watercourses. Such a swing bridge is known from, for instance, FR-A-1 223 544. In particular, the present invention has the aim of providing a swing bridge which permits of connecting two tracts of road surface realised on the banks of a watercourse, more specifically a canal, and which permits quickly of forming the said road connection so as to leave the said canal free for water-borne traffic. The invention, as characterised in the claims which follow, solves the above-described problem essentially by providing a swing bridge for the spanning of watercourses defined by a first bank and a second bank on which the said respective road surfaces are realised, which bridge is constituted by a mobile plane with prevalently longitudinal development, and which is able to be rested, at the first of its ends, on the said first bank and supported, near to its second end, in proximity to the said second bank, with the possibility of free rotation about a vertical axis passing through its longitudinal axis of symmetry; the said mobile plane being hinged, about its horizontal transversal axis and in proximity to its second end, to a vertical hinge pivot which pivot's axis coincides with the said vertical free rotation axis and is fixed, rotatably idle about its axis, to a base which base is part of or arranged in proximity to the said second bank; a mobile connecting plane being hinged, at the second end, to the said mobile plane, said connecting plane being mobile, by means of movement organs, between a lowered position, in which the connecting plane rests on the nearby second bank in a substantially level position with respect to the said mobile plane, and in a raised position for the movement of the said mobile plane. The said mobile plane exhibits, inferiorly and in proximity to its first end, a floating hollow body with variable trim, partially immersed in the water of the canal and able, by varying its trim, to raise or leave in the resting position the said first end on the said first bank; bi-directional nautical propulsion organs being envisaged, connected to the said mobile plane in proximity to the said floating hollow body for the movement of the said mobile plane about the said hinging pivot after the said hollow floating body has raised the first end of the mobile plane from the first bank and after the raising operation of the said movement organs of the said connecting plane for the said second bank. The invention will be discussed in more detail in the description which follows, made with reference to the accompanying drawings, which represent a non-limiting preferred embodiment, in which: Figure 1 shows, with some parts in section in order better to illustrate others, a lateral view of the swing bridge object of this invention; Figure 2 shows, in plan view, the swing bridge of figure 1; Figure 3 shows the section along line III-III of figure 2; and Figure 4 shows a constructional variant with reference to figure 1. With reference to the drawings, 1 denotes a swing bridge according to the invention, used for the spanning of watercourses 3 defined by a first bank 4 and a second bank 6, on which tracts of road surface 24 and 26 are realised. The swing bridge 1 comprises, essentially, a mobile plane 2 having a prevalently longitudinal development and restable, at its first end 21 on the said first bank 4. The second end 22 of the mobile plane 2 is supported in proximity to the second bank 6, with the possibility of freely rotating about its vertical axis Z passing through its longitudinal axis of symmetry Y. The said second end 22 of the mobile plane 2 is hinged, around its horizontal transversal axis X to a vertical hinge pivot 5 which hinge pivot's 5 axis coincides with the vertical rotation axis Z of free rotation. The hinge pivot 5 is set, freely and idle about its own axis, in a base 11 being part of or arranged in proximity to the said second bank 6. The mobile plane 2 has thus two degrees of freedom inasmuch as it can rotate about the horizontal X and the vertical Z axes: the first degree of freedom permits of the raising and the lowering of the said first end 21, while the second degree of freedom permits of the nearing or distancing, on a horizontal plane, of the same first end 21 to or from the said first bank 4. Below the second end 22 mobile means of support 10 are envisaged, constituted by a plurality of wheels 16, idle on coaxial shafts 17 supported by brackets 18 fixed inferiorly to the said mobile plane 2 as shown also in figure 3. In figure 3 four idle wheels 16 are shown, supported by three shafts 17 of which the central shaft crosses the upper end of the hinge pivot 5, so that the axis of the coaxial shafts 17 coincides with the axis X of the horizontal hinge of the mobile plane 2. The idle wheels 16 rest on the base 11 and provide for the mobile plane 2 a secure and solid support on the side of the second bank 6. As can be seen by comparing figures 2 and 3, the hinge pivot 5 is cylindrical and is housed rotatably idle inside a respective tubular support 19 fixed into the base 11. In a case such as that illustrated in figure 2, wherein the second end 22 of the mobile plane 2 is restable in a respective seating 14 sunk into the said second bank 6, in order that that no gap should exist between the mobile plane element 2 and the respective road tract 26, a connecting plane 7 is hinged to the said second end 22, about a transversal axis on the latter, which connecting plane 7 rests on the second bank 6 and acts as a connecting plane for the mobile plane 2 to the side of the said second bank 6. Movement organs 20 are envisaged between the mobile plane 2 and the connecting plane 7, composed of a pair of flow-dynamic cylinders 30 arranged below the said mobile plane 2 and connecting plane 7 and anchored by their opposite ends to respective pairs of brackets 31 and 32 fixed inferiorly to the mobile plane 2 and respectively to the connecting plane 7 as illustrated in figure 1. When the swing bridge 1 connects the two tracts of road surface 24 and 26, the first end 21 of the mobile plane 2 and the free end of the connecting plane 7 house in corresponding seatings 13 and 14 sunk into the two banks 4 and 6 at depths equal to the thickness of the corresponding ends to avoid disparity of level between the said swing bridge 1 and the said tracts of road 24 and 26. The transversal sections of the seatings 13 and 14 and of the respective ends 21 and 22 are truncoconical, with their shorter sides below for a faster and more secure fitting of the swing bridge 1 as will be described hereinafter. In proximity to its first end 21, the mobile plane 2 bears inferiorly a hollow floating body 8 and bi-directional water-propulsion organs 9. The hollow floating body 8 develops transversally to the mobile plane 2 and is of the type with adjustable trim, that is it is provided with means (not illustrated) able to vary its floating level, for example by means of the introduction or extraction of water to or from its inside. The dimensions of the hollow floating body 8 are such that during adjustment of its trim (see arrow C in fig. 1), it is able to raise or lower the first end 21 of the mobile plane 2, that is, it can rotate the mobile plane about the common axis X of the shafts 17 (see arrow B in fig. 1). The propelling organs 9, for example a propeller- or jet-type motor or similar, are supported by the floating body 8 and, more exactly, are freely mobile along a pair of guide rods 33, which guide rods 33 are solid to the hollow floating body 8 in order to keep their active elements 12, that is, their propeller or the outlet mouth of the jet-propeller, always immersed in the watercourse 3. As is illustrated in figure 2, the propelling organs 9 act transversally to the mobile plane 2 and in both advancement directions. Command means (not illustrated) for the various motor organs of the invention are also envisaged, that is, the movement organs 20, the nautical propulsion organs 9, means for the adjustment of the trim of the hollow floating body 8, for the movement of the swing bridge 1, as will be described hereinafter. In whatever configuration assumed by the swing bridge 1, the idle wheels 16 rest on the base 11 and support the second end 22 of the mobile plane 2. When the swing bridge 1 is used for the connecting of two tracts of road surface 24 and 26, the first end 21 of the mobile plane 2 rests on the bottom of its respective seating 13 and the free end of the connecting plane 7 rests in its respective seating 14 in such a way that there is no gap between the two tracts of road surface 24 and 26. Should a craft wish to pass through the swing bridge 1, first the connecting plane 7 is raised by action of the flow-dynamic cylinders 30, (see figure 1, arrow A) then the mobile plane 2 (see figure 1 arrow B) is raised, by adjustment to the trim of the hollow floating body 8 (see figure 1 arrow C). Then, after the free end of the connecting plane 7 has totally exited from its relative seating 14 and the first end 21 has exited from its relative seating 13, the propulsion organs 9 are activated, whose active elements 12 are still immersed in the watercourse 3 thanks to their freedom of up-and-down movement, to move the first end 21, that is to rotate the mobile plane 2 about the hinge pivot 5 (see Figure 2 arrow D) until the watercourse 3 is freed for the craft's passage. After such passage, in order to close the swing bridge 1 the trim of the floating hollow body 8 is adjusted in the opposite direction to the preceding in order to lower the first end 21 of the mobile plane 2. Usually the first end 21 exhibits a trapezoid section (not illustrated) which permits of its precise positioning inasmuch as it finds its respective seating 13 during its lowering. Successively to this, the free end of the connecting plane 7 is lowered by action of the flow-dynamic cylinders 30. The principal advantage of the present invention consists in its operative speed, in that the central arrangement of its vertical rotation axis Z coinciding with the axis of the hinge pivot 5 permits of always rotating the entire swing bridge 1 in the direction away from the craft, which can therefore advance during the opening phase of the swing bridge 1. This rapidity is increased by the arranging of the hollow floating body 8 transversally to the mobile plane 2, and thus longitudinally to the advancement direction of the said floating hollow body 8 in the watercourse 3. Such an arrangement of the floating hollow body 8, apart from increasing the movement velocity of the mobile plane 2 about the hinge pivot 5, permits of leaving a part of the watercourse 3 free so that smaller craft can pass below the mobile plane 2 without the need to act on the swing bridge 1. The possibility of rotating the mobile plane 2 in both directions provides also a greater security of functioning inasmuch as it is no longer necessary, on the part of the craft, to observe a determined security distance from the swing bridge 1 during its opening. A further advantage of the present invention is constituted by its sturdiness and the stability of the swing bridge 1, made possible by the fact that the said swing bridge 1, during the connection phase of the tracts of road surface 24 and 26, rests on stable elements independently of any eventual variations in static levels or dynamics vis-à-vis the watercourse, that is, the banks 4 and 6, and the base 11. The invention as conceived is susceptible to numerous modifications without foresaking the inventive concept: one of these modifications, for example, is illustrated in figure 4, where the mobile plane 2 of the swing bridge 1 bears inferiorly a first and a second floating hollow body 8 and 8a having adjustable trim and being partially immersed in the watercourse 3. The first floating hollow body 8 arranged for example more centrally to the mobile plane 2, does not exert a push on the said mobile plane 2 sufficient to lift it, while the second floating hollow body 8a is able, by adjustment of its trim and in collaboration with the push exerted by the first floating hollow body 8, to exert a variable push capable of lifting or leaving at rest the first end 21 of the mobile plane 2 on the first bank 4. Furthermore, all the details can be replaced with technically equivalent elements.

Claims: A swing bridge (1) for the spanning of watercourses (3) defined by a first bank (4) and a second bank (6) on which two respective road surfaces (24, 26) are realised, which bridge is constituted by a mobile plane (2) with a prevalently longitudinal development able to be rested, at a first of its ends (21), on the said first bank (4) and supported, near to a second end (22), in proximity to the said second bank (6), with the possibility of free rotation about a vertical axis (Z); the said mobile plane (2) being hinged, about its horizontal transversal axis (X) and in proximity to its second end (22), to a vertical hinge pivot (5) fixed, rotatably idle about its axis, to a base (11) which base (11) is part of or arranged in proximity to the said second bank (6); the said mobile plane (2) exhibiting, inferiorly and in proximity to its first end (21), at least one floating hollow body (8) with variable trim, partially immersed in the water of the said watercourse (3) and able, by varying its trim, to raise or leave in the resting position the said first end (21) of the said mobile plane (2) on the said first bank (4); bi-directional nautical propulsion organs (9) being envisaged, connected to the said mobile plane (2) in proximity to the said floating hollow body (8) for the movement of the said mobile plane (2) about the said hinge pivot (5) after the said hollow floating body has raised the first end (21) of the mobile plane (2) from the first bank (4). A swing bridge as in claim 1, wherein the said mobile plane (2) is restable with its said second end (22) in a respective seating (14) sunk into the said second bank (6), in order that no gap should exist between the mobile plane (2) element and the respective road tract (26), and wherein a connecting plane (7) is hinged to the said mobile plane (2) at its second end (22) and is mobile by means of movement means (20), between a lowered resting position inside the said seating (14) sunk into the nearby second bank (6) of the watercourse (3), in which position the said connecting plane (7) is substantially level with the said mobile plane (2), the said two planes (2, 7) forming thus the bridge connecting the said two tracts of road surface (24, 26), and a raised position of movement of the said mobile plane (2). A swing bridge as in claim 1, wherein the said second end (22) of the said mobile plane (2) bears inferiorly mobile support means (10) resting on the said base (11), having the aim of supporting without a gap the said second end of the mobile plane (2). A swing bridge as in claim 1, wherein the said mobile plane (2) bears, inferiorly and in proximity to its said first end (21), a first and a second floating hollow body (8, 8a) with adjustable trim and partially immersed in the watercourse (3), said first floationg hollow body (8) not exerting on the said mobile plane (2) a push sufficient to lift it and the second said floating hollow body (8a) being able, by adjustment of its trim and in collaboration with the said first floating hollow body (8), to exert a variable push sufficient to lift the said first end (21) of the said mobile plane (2) or to leave it in the resting position on the said first bank (4). A swing bridge as in claim 1, wherein the said bi-directional nautical propulsion organs (9) are directly supported by the said floating hollow body (8 or 8a) with the possibility of free vertical movement with the aim of keeping the active elements of the said propulsion organs (9) immersed in the watercourse (3).

Inventors: MIGLIETTI GIOVANNI, MIGLIETTI, GIOVANNI
Applicants: MIGLIETTI GIOVANNI, MIGLIETTI, GIOVANNI
Application year: 1992
Main classification: E01D15
IPC codes: E01D15