FR2909404A1 - Window glass fixing system for motor vehicle, has screw including shoulder delimiting tightening surface resting on fastener when screw is tightened in fastener, and bearing allowing slider to pivot around screw when screw is tightened - Google Patents

Abstract

The system has a fastener (1) including an expandable head (11) fixed to a window glass (2). A tightening screw (27) traverses a hole of a slider (3), and is screwed in the fastener. The screw has a shoulder delimiting a tightening surface (31) resting on the fastener when the screw is tightened in the fastener. The shoulder delimits a rotary cylindrical bearing (29) allowing the slider to pivot around the screw when the screw is tightened.

Description

1 System for attaching a window to a window lift mechanism The invention

  relates to a system for fixing a window to a slider of a window mechanism of a motor vehicle, comprising a clip provided with fixing means to the window and a screw adapted to pass through a hole of the slider and to screw into the staple. In a window lift mechanism, the window is generally guided in motion between two rails by being slidably mounted on each rail via a fastening system. Each fastening system is rigidly secured to the window while being guided in the rail by a slide-type connection. Such a fastening system more particularly comprises a clip rigidly fixed to the window and a slider having a portion fixed to the staple and another sliding part in the rail. This slider is attached to a cable adapted to move along the rail to raise or lower the window, this cable being moved by an electric motor or a crank. The window, the staple and the slider are rigidly secured to each other by a screw passing through the slider, the staple and the window extending in a transverse direction, that is to say normal to the window. This screw is tightened by an operator during assembly of the window in the door, the slider being thus compressed between the head of the screw and the staple. But it appears that after several cycles of manipulation of the window, to make it up and down, this screw loosens. The object of the invention is to provide a fastening system structure to overcome this disadvantage. To this end, the subject of the invention is a system for attaching a window to a slider of a motor vehicle window lift mechanism, comprising a clip provided with means for fastening to the window and a suitable screw. through a hole in the slider and to be screwed into the staple, and wherein the screw comprises a shoulder delimiting on the one hand a clamping face bearing on the staple when the screw is tightened in the staple and on the other hand a rotating cylindrical bearing allowing the cursor to rotate around the screw when it is tightened. The invention also relates to a system as defined above, wherein the clip comprises a bearing surface on the window and an expandable head having a general shape of revolution oriented in a direction normal to this bearing face. the expandable head being adapted to engage a corresponding hole in the window, and in which the screw engages in the expandable head to lock the clip on the window by expanding the head when tightening the screw. . The invention also relates to a system as defined above, comprising a nut trapped at the end of the expandable head. The invention also relates to a system as defined above, wherein the nut has a generally frustoconical side face to cause expansion of the expansible head during tightening of the screw.

The invention also relates to a system as defined above, wherein the expandable head comprises a plurality of tabs extending in the normal direction to the bearing face of the staple, and wherein these tabs comprise internal lugs. to hold the nut 30 trapped at the end of the expandable head. The invention also relates to a system as defined above, wherein the generally frustoconical side face of the nut is provided with a flat, and wherein one of the legs has a surface adapted to receive the flat. The invention will now be described in more detail and with reference to the appended figures.

Figure 1 is a cross-sectional view of the fastening system according to the invention; Figure 2 is a perspective view showing the clip of the system according to the invention without a fixing nut; Figure 3 is a perspective view showing the clip of the system according to the invention and the fixing nut; Figure 4 is an overview of the fastening system according to the invention. The basic idea of the invention lies in the observation that the loosening of the fastening screw of the fastening system is due to slight rotations of the slider caused by the support of this slider on end stops. stroke equipping each rail. Whenever the window is mounted completely or completely lowered, at least one of the sliders bears on one of these stops. Given the game that exists in guiding the cursors in the rails, the fact that the cursor is seated on a stop makes this cursor pivot slightly about an axis coinciding with that of the fixing screw. This slight rotational movement results in a rotational movement of the screw, tending to loosen the head of this screw exerting a direct pressure on the slider. Cycle after cycle, these slight rotational movements cause a significant loosening of this screw.

The loosening is avoided with the fastening system according to the invention which comprises a pivot connection to allow a slight rotation of the slider relative to the assembly formed by the screw, the clip and the window, so that the light Cursor rotation movements 35 have no influence on the clamping screw. The fastening system according to the invention shown in FIG. 1, comprises a clip marked 1, fastened to a glass pane 2, and a slider 3 which is fixed to the clip 1 by a clamping screw 4 engaged in the clip 1. staple being screwed into a nut 6 trapped in this clip 1. The staple 1 which is shown alone in FIG. 25 comprises a plate 7 having a support face 8 on the pane 2 and a face 9 on which comes it also comprises an expandable head 11 protruding from the face 8, and having a general shape of revolution about an axis AX normal to the bearing face 8. The expandable head 11 is formed by four lugs 12, 13, 14 and 16, extending parallel to the axis AX, each lug comprising an external lug protruding radially away from the axis AX, these lugs being marked by 17, 18 , 19 and 21. This expandable head 11 is sized to engage in a hole c corresponding 22 of the glass, the bearing face 8 of the clip then being in abutment on a corresponding face 23 of the glass, which corresponds to the situation of Figure 1. In this situation, the end of the expandable head 11 protrudes from the face 24 of the window, which is its opposite face to the face 23, so that the lugs protrude radially from the edge of the circular edge hole 22 25 to retain the clip in position on the window, by snapping. The clip further comprises a bore extending along the axis AX through the plate 7 and located in the center of the expandable head 11. The tabs 12, 13, 14 and 16 defining the expandable head 11 thus define an internal space 26, which they surround, and which is capable of trapping the nut 6. This inner space 26 has a general shape of truncated cone, axis AX, having its small diameter section 35 close to the plate 7 and its section of large diameter located towards the free end of this expandable head 11. The nut 2909404 5 6 has a generally conical outer surface complementary to this internal space 26. The tabs 12, 13, 14 and 16 are each provided with an internal lug, that is to say extending radially in the direction of the axis AX and located at the leg end, to retain the nut 6 trapped inside the internal space 26 once it has been engaged in the latter by the free end of the expansible head 11. When the screw Tightening which is marked by 27 is engaged in the nut 6 and tightened, it tends to bring this nut of the plate 7 which causes the expansion of the head 11 by moving the legs away from each other because of the shapes cone complementary to the nut 6 and the internal space 26. This expansion allows complete blocking of the clip 1 relative to the window 2, the tabs then having their outer faces compressed on the cylindrical inner face of the hole 22 In order to allow a relative rotational movement around the axis AX, of the slider 3 with respect to the staple 1, the clamping screw 27 is provided with a shoulder widening its diameter near the head 28 of this screw. This shoulder defines on the one hand a cylindrical bearing 29 around which the slider 3 can pivot freely and on the other hand a face 31 of support or clamping 25 of the screw 27 on the face 9 of the staple 1. This shoulder is extended, in the opposite direction of the head 28, by a thread of nominal diameter smaller than that of the bearing 29, and carrying a stud 30 at its end. This stud has a diameter smaller than the nominal diameter of the thread and is oriented along the axis AX, it constitutes a driver facilitating the engagement of the screw in the clip. The nut 6, shown alone in FIG. 3, comprises a threaded central bore 32, a front face and a flat rear face parallel to each other, marked 33 and 34, and an outer surface 36 that is generally frustoconical and provided with a flat surface 37.

As indicated above, the internal space 26 in which the nut 6 is imprisoned has a shape complementary to the nut, and notably comprises a complementary face of the flat part 37 so as to immobilize the nut 6 in rotation. For this purpose, the tabs 12, 13 and 14 each have an inner face in the form of cone portion, while the tab 16 has a flat inner face intended to receive the flat part 37.

Thus, the tabs 12, 13 and 14 have, in a plane of section normal to the axis AX, a contour delimited by two arcs of circles of the same centers and different radii these arcs having their ends joined by radial segments. The tab 16 has, in section, an outline 15 delimited by an arc and a segment, this arc and this segment having their ends joined by two radial segments. The slider 3 comprises a support surface 10 on the face 9 of the staple, this face 10 being carried by a plate 38 which is traversed by a central hole 39 extending along the axis AX, that is, that is to say in a direction normal to the face 10. This central hole 39 has a diameter corresponding to that of the bearing 29 delimited by the shoulder of the screw 27, and its length is substantially less than the length of this bearing along AX axis. The mounting of the fastening system according to the invention consists firstly in engaging the expandable head 11 of the staple 1 in the hole 22 of the pane 2, then in engaging the nut 6 in its housing 26, by the free end of the expandable head 11. The slider 3 is then positioned vis-à-vis the window 2 at its clip 1, which allows to engage the screw 27 and tighten, which leads to 1. The clip 1 is thus rigidly fixed to the window 2 by expansion of its head 11 by tightening the screw 27, while having its face 8 pressed against the face of the window 2.

On the other hand, as shown in Figure 1, the screw 27 is then clamped on the clip 1 by virtue of its bearing surface 31, by which the clamping force is transmitted to the staple. Thus, the slider 3 remains free to pivot about the axis AX, relative to the staple and the window. In operation, when the cursor reaches the limit stop, it is thus free to rotate slightly because of the support on the stop, but thanks to the bearing 29, this pivoting can not cause loosening of the screw 10 27 As can be seen in FIG. 4, the fastening system according to the invention does not require any particular modification to be integrated with an existing window lift mechanism.

The system according to the invention is thus mounted on a window lifter device by engagement of the slider 3 on a slideway 41 of a rail 42. This slider 3 being linked in motion with a cable 43 engaged on a wheel 44 of FIG. a pulley mounted at the end of the rail 42.

The invention provides various advantages. The stud 30 located at the end of the screw 27 is a driver that facilitates the engagement of this screw 27 in the system during assembly on production line.

The pivot connection provided by the bearing 29 of the screw and the bearing and clamping surface 31 of this screw on the face 8 of the clip makes it possible to avoid generating mechanical stresses on the slider 3 when clamping the opinion.

Thanks to this pivot connection, a slight rotation of the slider when it comes to a stop does not cause loosening of the screw. This also makes the assembly of the glass, as a whole, less hyperstatic. This makes it possible to increase manufacturing tolerances, to reduce the intensity of the forces required to maneuver the window, the noise generated when the window 2909404 is operated, as well as the dimensioning of the window gasket which needs less robustness. . This reduction in the degree of hyperstaticity, which results in maneuvering the window without being subjected to transversely oriented forces, which facilitates the implementation of an anti-pinch device, that is to say say a device that stops the movement of the glass on detection of the presence of an obstacle. The expandable head 11 with the nut 6 which it traps allows a very simple and ergonomic mounting of the clip 1 on the pane 2, since it suffices to engage it in the corresponding hole 22 of the pane 2 then engage the nut 6 in the end 11 by simply pressing. The head 11, because it is provided expansible 15 under the effect of the tightening of the screw 27, allows to use the same staple 1 for different thicknesses of glass, which helps to reduce production costs. The nut 6 can be chosen as a metal, which makes it possible to increase the tightening forces while achieving a faster tightening, without the risk of damaging the threads.

Claims (6)

  1. System for attaching a window (2) to a slider (3) of a motor vehicle window mechanism, comprising a clip (1) provided with fastening means (11) to the pane (2) and a screw (27) adapted to pass through a hole of the slider and to be screwed into the staple (1), and wherein the screw (27) comprises a shoulder delimiting on the one hand a clamping face (31) coming into pressing on the staple (1) when the screw (27) is clamped in the staple (1) and on the other hand a cylindrical bearing (29) rotating allowing the slider (3) to pivot about the screw (27) when it is tight.   2. System according to claim 1, wherein the clip (1) comprises a face (8) of support on the pane (2) and an expandable head (11) having a general shape of revolution oriented in one direction (AX ) normal to this bearing face (8), the expandable head (11) being adapted to engage in a corresponding hole (22) of the pane (2), and wherein the screw (27) engages in the expandable head (11) for locking the clip (1) on the window (2) by expansion of this head (11) during the tightening of this screw (27).   3. System according to claim 2, comprising a nut (6) trapped at the end of the expandable head (11).   A system according to claim 3, wherein the nut (6) has a generally frustoconical side face (36) for causing expansion of the expandable head (11) upon tightening of the screw (27).   5. System according to claim 4, wherein the expandable head (11) comprises a plurality of tabs (12, 13, 14, 16) extending in the direction (AX) normal to the bearing face of the clip (1). ), and wherein said tabs (12, 13, 14, 16) comprise internal lugs for holding the nut (6) trapped at the end of the expandable head (11). 2909404 10   6. The system of claim 5, wherein the generally frustoconical side face of the nut (6) is provided with a flat (37), and wherein one of the tabs (16) has a surface adapted to receive the flat (37).