REVERSIBLE MOTOR VEHICLE ROOF

Abstract: A reversible roof of a motor vehicle comprises an elongate hollow body (10) fixed to the frame (11) of the roof, in which there are slidable towards and away from one another the ends of a highly elastic lamina (25) whose central section protrudes from an opening (15) of the hollow body (10) and which is rigidly connected to the roof (26); a manually pivotable knob (14), disposed outside the body (10), is connected to mechanical members (18, 19) which determine the approaching or the moving away of the ends of the lamina (25) within the body (10) depending on the direction of rotation of the knob (14), thus giving rise to the outgoing or re-entry of the central section of the lamina (25) from or into the body (10), respectively, and therefore to the opening or the closure of the roof (26).

Description: This invention relates to a reversible roof of motor vehicles. Among the reversible roofs installed as first equipment or as accessories, there are some which may be left open in an infinite number of angled positions relative to the roof of the vehicle. The opening control device of these roofs is formed by a pivotable knob or lever which sequentially determine the various angular opening positions of the roof. In some cases the lever or knob operate a group of telescopic tubes whose end portions are rigidly connected to the frame and to the roof respectively. The withdrawal of the tubes due to the action of the lever or knob causes the progressive opening of the roof up to the position of maximum extension of the telescopic tubes. According to another technical solution, the lever or knob give rise to the compression or extension, respectively, of a spiral spring compressed between the frame and the roof. Also in this case, an infinite number of opening positions of the roof between the closure position and the position of maximum opening are obtained. However, both systems are rather complex from the constructional point of view so much so that they always form too cumbersome units which do not allow to obtain a large angle of maximum opening of the roof just because of the difficulty to install within small spaces such complex opening devices which at the same time to carry out sufficiently ample movements between their extreme operative positions. It is also obvious that complex devices lead to a high cost of the roof, so as to render it scarsely interesting for the purchaser. The object of the invention is to propose an opening device with infinite angular positions of the roof , which will be very simple to be manufactured, have small overall dimensions and allow to obtain an infinite number of opening positions up to a maximum opening position sufficient to fully exploit all the advantages of the reversible roofs. Besides being simple to be manufactured, the proposed roof is also of a very moderate cost in comparison with those which are used at present time, and scarsely subject to failures or breakings thanks to its structural simplicity. For these and further objects which will be more clearly apparent from the following description, the invention proposes to provide a reversible motor veicle roof, characterized in comprising an elongate hollow body fixed to the frame of the roof, in which there are installed, in a mutually sliding fashion towards and away from one another, the ends of a lamina or elastically yielding thread whose central section protrudes from an opening of the hollow body and is rigidly connected to the roof, manual and electric control means being provided, which through a mechanical transmission contained within the body determine said sliding of the ends of the lamina towards and away from one another,thus giving rise to the opening or the closure of the roof, respectively. The subject matter of the invention is described hereunder with reference to the annexed drawings in which: FIGURE 1 is a vertical section of the roof in its closed condition, traced in the zone of the opening device according to the invention, according to a first embodiment thereof, FIGURE 2 is a section along line II-II of Fig. 1, FIGURE 3 is a section along line III-III of Figure 1, FIGURES 4 and 5 are similar to Figures 1 and 4, respectively, but with the roof in an opened position, FIGURES 6 and 7 are similar to Figures 1 and 3 with the roof in its closed condition, but with the device of the invention according to a second embodiment, FIGURES 8, 9 and 10 are sections along lines VIII-VIII, IX-IX and X-X of Figure 6. By examining first the embodiment represented in Figures from 1 to 5 it is noticed that the device according to the invention consists of an elongate box-shaped flat body 10 fixed to the frame 11 of the rim applied onto the space formed in the roof of the vehicle. Formed centrally in the body 10 are two holes, of which the lower 12 is intended to allow the insertion of the relief 13 of a knob 14, whilst the upper hole 15 allows to couple with the curved walls 16 of the body 10, with a slight clearance, the walls of a circular plate 17, disposed inside the body itself, rigidly connected to the knob 14 by means of bolt 9. Moreover, inserted between the plate 17 and the relief 13 is a gear 18, also rigidly connected to the knob 14. Meshing with the gear 18 are two racks 19 diametrically opposite relative to the gear (Fig. 3) and hinged, at their ends, at 20, to plates 21. Racks 19, in addition to meshing with the gear 18, are constrained to slide along guides 22 of the body 10 (Fig. 3), being provided with pivots 23 inserted into said guides. For reasons which will be explained later, guides 22 have a long rectilinear section which is radiused to a curved section in the zone of the gear 18, whose curvature they follow. The plates 21, slidingly lodged within the body 10, are rigidly connected to further upper plates 24 and between them there is pinched in a stable manner the end of an harmonic spring 25 which freely extends above the rack 19, passes between the walls 16 of the body 10 and the circular plate 17 and then becomes rigidly engaged, in its median section, on the inner face of the reversible roof 26. Let us suppose that we start from the closed position shown in Figures 1, 2 and 3. If the knob 14 is rotated in the direction of the arrow A of Fig. 3, the gear 18, rigidly connected to said knob, drags into rotation the front teeth 27 of the racks 19, which in the meantime rotate together with the pins 23 which slide by frictionning within the curved sections of the guides 22. When the racks 19, by continuing to rotate the knob 14, have reached a position in which they are parallel with one another, as shown in Fig. 5, they begin to slide parallel with themselves thereby meshing with the gear 18, inasmuch as now the pins 23 slide within the rectilinear sections of the guides 22. This means that also the end plates 21 and 24 slide within the cavity of the body 10 by mutually moving towards the knob 14 itself. The spring 25 is given vent for this approaching of its ends, by centrally slipping off between the walls 16 and 17, as shown in Fig. 4, so that the roof 26 rises by angularly rotating on its conventional hinges. It is obvious that leaving the knob 24 in a rotational position, the roof remains open in that position, because there is no freedom of sliding of the spring 25 in the two directions, inasmuch as the racks 19 are locked on the respective teeth of the gear 18 and the plates 21 and 24 cannot slide within the body 10. The maximum opening corresponds to the maximum length of the racks 19, so that it varies solely as a function of how elongate the body 10 is desired to be made, which does not involve limitations since it extends on the longer side of the frame of the roof and hence has at its disposal a space which is considerably larger than the space required for obtaining a remarkable maximum opening of the roof, beyond which there is no advantage to come to. When closing again the roof, the user obtains the position of complete closure when the pins 23 if the racks 19 move along the last curved section of the guides 22 and the teeth mesh with the gear 18. In this last stage of rotation of the knob 14 the user notices a slight resistance of the system which informs him that he is on the point of completing the closure, which takes place when the pins 23 attain the end of stroke within the guides 22, as can be seen in Fig. 3. In addition to a valid method of closing, this provision also allows the user to perceive that the closure is on the point of being achieved, which, instead, in the conventional roofs usually is not provided and the user notices that he has reached the complete closure only when his efforts on the knob to continue its rotation result vain. The second embodiment of the device according to the present invention, shown in Figures from 6 to 10, is more simple than the preceding embodiment, inasmuch as non provision is made therein for the use of a locking system of the roof in the position of closure, described above, but it attains the same advantages thereof by using an actuator unit which is equivalent from the functional point of view. The same reference numerals indicate in the two embodiments shown in Figures from 1 to 5 and from 6 to 10 the same members of the device. In the embodiment shown in Figures from 6 to 10 the body 10 has a lower central hollow drawing 30, on which the knob 14 is pivoted. The knob 14 is rigidly conneted to a pinion 31 with which two gears 32 and 33, lodged in the drawing 30 of the body 10. In mesh with each gear is a rack 34 and 35 which terminates, at its other end, with a plate 36. Pinched between these plates 36 and the upper plaque 24 are the ends of the harmonic spring 25, which uncoils, as in the preceding embodiment, between the walls 16 and 17 and is rigidly connected centrally to the roof 26. When the knob 14 is made to rotate in the two opposite directions, also the gears 32 and 33 which mesh with the pinion 41 are rotated. Consequently, also the racks 34 and 35 slide mutually towards and away from one another depending on the direction of rotation of the knob. As already illustrated for the preceding embodiment, the approaching of the racks gives rise to to the extension of the spring centrally beyond the body 10 and, consequently, the rise of the roof up to the position of maximum opening corresponding to the end of travel of the racks. The rotation of the knob 14 in the opposite direction, instead, causes the return of the spring 25 into its seating up to the closure of the roof (position shown in Figures from 6 to 10.

Claims: 1.- A reversible roof of motor vehicles, characterized in comprising a hollow elongate body fixed to the frame of the roof in which there are mutually slidable towards and away from one another the ends of a lamina or an elastically yiemdable wire hose central section protrudes from an opening of the hollow body and is rigidly connected to the roof, manual or electric control means being provided which through a mechanical transmission contained within the body give rise to said sliding towards and away from of the ends of the lamina, thus producing the opening or the closure of the roof, respectively. 2.-A roof as claimed in Claim 1, characterized in that the means which produce the sliding of the ends of the lamina are formed by a knob, disposed outside the body, rotating about an axis perpendicular to the roof, to which a gear is rigidly connected for rotation therewith, with which two racks are in mesh to which the ends of the lamina are rigidly connected. 3.- A roof as claimed in Claim 2, characterized in that the racks are hinged to the ends of the lamina and are each provided with a pin sliding in respective parallel diametrically opposite relative to the gear and having their end section curved such as to follow the curvature of the gear for about 90° of its periphery, and in that the racks are provided with a further front tooth which is in mesh with the gear during the sliding of the respective pin in the curved section of its guide. 4.- A roof as claimed in Claim 1, characterized in that the lamina is pinched at its ends between two plates sliding in the body and constrained to said means which determine the sliding of said plates in the two directions. 5.- A roof as claimed in Claim 1,characterized in that the opening in the body through which the lamina protrudes has inner and outer guide walls for guiding the spring, which are curved convergent towards the outside of the body. 6.- A roof as claimed in Claim 1, characterized in that the means which produce the sliding of the ends of the lamina are formed by a knob disposed outside the body, rotating about an axis perpendicular to the roof, to which a pinion is rigidly connected for a rotational movement therewith, with which two gears are laterally in mesh which mesh with respective racks contained in a sliding fashion within the body and to which the ends of the lamina are rigidly connected.

Inventors: LELIO, ALFONSO
Applicants: VALLKO S.R.L.
Application year: 1987
Main classification: B60J7
IPC codes: B60J7