Patent Description:
Typically, a vehicle includes a windscreen mounted at the front of the vehicle in front of a driver of the vehicle, who can see through the windscreen to the road and the front of the vehicle. The windscreen must be transparent to allow the driver to observe the front of the vehicle.

Because of its position at the front of the vehicle, water and dirt will tend to accumulate on the windscreen, particularly during foul weather conditions, obstructing the driver's view of the road ahead. To this end, the vehicle includes a wiper system to remove water and dirt deposits from the vehicle's glass surface.

The wiper system traditionally consists of an arm extending between a first end attached to the vehicle and a second end to which a wiper blade is attached. The arm is connected to a shaft of an electric motor of the vehicle via its first end, the shaft of the electric motor driving the arm back and forth about a main extension axis of the arm to wipe the windscreen.

Certain vehicles (in particular buses and heavy-goods vehicles) may be equipped with a panoramic glass surface as a windscreen, i.e. a glass surface with end portions that extend over/around the side edge of the vehicle. Such windscreens are considered particularly advantageous in that they provide exceptionally good visibility to the driver.

The end portions can be difficult to wipe effectively for known wiper systems. This is because the wiper system can generally wipe a flat surface, but it is more complicated to wipe a window extending in at least two intersecting planes.

Document <CIT> discloses a wiper system with a rotational connection according to the state of the art.

In a first aspect, therefore, the present invention is directed to a wiping system for a glass surface of a vehicle, the wiping system comprising at least one wiper blade for wiping the glass surface and an arm carrying the wiper blade, the arm comprising at least one driver configured to drive the wiper blade in a reciprocating manner, a rod at the end of which the wiper blade is arranged, and at least one connecting member arranged between the rod and the driver, the arm having a pivot connection between the connecting member and the driver and a rotational connection between the connecting member and the rod.

According to the invention, the wiping system comprises a means for limiting the pivoting of the pivotal connection between the connecting member and the driver.

The pivot connection enables at least the connecting member to be pivoted about a main extension axis of the arm, the connecting member pivoting the arm shaft and the wiper blade.

The pivot limiting means may be configured to block the pivoting of the connecting member, i.e. to limit this pivoting to an angular sector in order to prevent the connecting member from pivoting the wiper blade too far. The pivot-limiting device thus locks the connecting member in a first position or a second position, the connecting member pivoting from one position to the other.

Depending on the particular embodiment, the pivot-limiting device may be configured to block the pivoting of the connecting member during operation, defining the limits of the wiper blade's pivoting trajectory.

Alternatively, the pivot-limiting device can be made to serve as a safety stop, preventing the wiping system from over-rotating and damaging the wiper system, windscreen, and/or vehicle body. Such over-rotation can occur when certain portions of the wiper blade are either blocked from freely moving or when they are forced beyond their ordinary range of motion.

According to an optional feature of the invention, the pivotal connection is about an axis and the rotational connection is about a direction, the axis being secant to the direction.

According to another optional feature of the invention, the pivot limiting means comprises a groove arranged on the driver and a pin projecting from the connecting member, the pin cooperating with the groove to block pivoting of the connecting member about the axis of the pivotal connection at a first end of the groove or a second end of the groove.

According to another optional feature of the invention, the pivot limiting means comprises a groove arranged on the connecting member and a pin projecting from the driver, the pin cooperating with the groove to block pivoting of the connecting member about the axis of the pivotal connection at a first end of the groove or a second end of the groove.

According to another optional feature of the invention, the pivot limiting means locks the connecting member in a first position and in at least a second position after pivoting the connecting member about the pivot linkage.

According to another optional feature of the invention, the groove has a curved shape between the first end and the second end. Furthermore, the curvature of the groove is inscribed in a circle whose center is coincident with the axis of the pivot connection.

According to another optional feature of the invention, the pin has a curved profile cooperating with the curved shape of the groove. Likewise, the curvature of the pin is inscribed in a circle whose center is coincident with the axis of the pivot connection.

According to another optional feature of the invention, the wiper system includes a linkage member configured to rotate at least the arm shaft about the pivot connection relative to the driver, the linkage member being configured to force rotation of the arm shaft about the pivot connection.

According to another optional feature of the invention, the connecting member comprises at least one lever and at least one swivel joint arranged at one end of the lever.

According to another optional feature of the invention, the driver and/or the rod comprises at least one protrusion at the end of which the ball joint is arranged.

In a second aspect, the present invention also relates to a method of wiping a glazed surface by a wiping system according to any of the preceding claims, the glazed surface comprising a first portion extending in a first plane and at least one second portion curved relative to the first plane.

According to the invention, the method characterised in that the pivot limiting member locks the connecting member relative to the driver in a first position to wipe the first portion of the glass surface and locks the connecting member relative to the driver in a second position to wipe the second portion of the glass surface, the connecting member being pivoted about the pivot linkage to move from one position to the other.

Other features, details and advantages of the invention will become clearer on reading the following description on the one hand, and several exemplary embodiments given by way of indication and not limitation with reference to the appended schematic drawings on the other hand, in which:.

The features, variants and different embodiments of the invention may be associated with one another in various combinations, provided that they are not incompatible or exclusive of one another. In particular, it will be possible to imagine variants of the invention comprising only a selection of features described hereinafter in isolation from the other features described, if this selection of features is sufficient to confer a technical advantage and/or to differentiate the invention from the prior art.

In the figures, elements common to several figures retain the same reference.

In the following detailed description, the terms "longitudinal", "transverse" and "vertical" refer to the orientation of a wiper system according to the invention. A longitudinal direction corresponds to a main direction of elongation of a duct of the arm of the wiping system, this longitudinal direction being parallel to a longitudinal axis L of an L, V, T shown in the figures. A transverse direction corresponds to a direction along which a protrusion of a driver of the arm mainly extends, this transverse direction being parallel to a transverse axis T of the reference frame L, V, T and this transverse axis T being perpendicular to the longitudinal axis L. Finally, a vertical direction corresponds to a direction parallel to a vertical axis V of the reference frame L, V, T, this vertical axis V being perpendicular to the longitudinal axis L and the transverse axis T.

As illustrated in <FIG>, a wiper system <NUM> comprises at least one arm <NUM> comprising a driver <NUM> extending between a first end <NUM> and a second end <NUM>. At its first end <NUM>, the driver <NUM> is attached to a vehicle, and more particularly to a shaft of an electric motor that sets the wiper system <NUM> in motion about a rotation axis R of the wiper system <NUM>. The wiping system <NUM> has the function of wiping a glass surface of the vehicle, which may, for example, be the windscreen <NUM> of the vehicle. According to the invention, the windscreen <NUM> is a panoramic glass surface comprising at least two parts: a first portion <NUM> comprising at least one flat surface <NUM> extending in a first plane and a second portion <NUM> extending in a second plane secant to the first plane. The second portion <NUM> comprises a planar surface <NUM> extending in the second plane and a curved surface <NUM> connecting the planar surface <NUM> of the second portion <NUM> to the planar surface <NUM> of the first portion <NUM>. The wiper system <NUM> is driven in rotation, about the axis of rotation R. Once the electric motor is switched on, the wiper system <NUM> performs a back and forth movement against the windscreen <NUM> of the vehicle to wipe it, performing at least one pass on the first portion <NUM> and on the second portion <NUM> of the windscreen <NUM>.

In addition, the wiping system comprises a wiper blade <NUM> comprising at least one wiping strip <NUM> configured to be in contact with the windscreen <NUM> of the vehicle and to wipe it. The wiping strip <NUM> has a triangular cross-section, only one edge of which is in contact with the windscreen <NUM>, and this edge is referred to as the wiping edge. The wiping strip <NUM> moves around a hinge, a line passing through the wiping angle of the wiping strip <NUM> and the hinge and forms a specific angle with the windscreen <NUM>.

In order to perform an effective wipe, the specific angle must form an angle within a range of values. This angle must be maintained on the first portion <NUM> of the windscreen <NUM> as well as on its second portion <NUM>; the invention achieves this by simple and reliable means.

As illustrated in <FIG>, the wiping system <NUM> thus comprises the wiper blade <NUM>, the arm <NUM> comprising on the one hand the driver <NUM> and on the other hand a rod <NUM>, and a connecting member <NUM> which is located between the second end <NUM> of the driver <NUM> and the rod <NUM>, the rod <NUM> extending between the connecting member <NUM> and the wiper blade <NUM>.

The connecting member <NUM> is connected to the rod <NUM> on the one hand and to the driver <NUM> on the other hand. The connection between the connecting member <NUM> and the rod <NUM> forms a rotational connection A around which the rod <NUM> and the wiper blade <NUM> can be rotated. This rotational connection A extends along a direction substantially parallel to the transverse axis T of the trihedron L, V, T.

The connection between the connecting member <NUM> and the driver <NUM> forms a pivot connection P about which the connecting member <NUM> and the rod <NUM> can be pivoted relative to the driver <NUM>. This pivot connection P extends along an axis S which is substantially parallel to the longitudinal axis L of the marker L, V, T.

Here, the direction F of the rotational connection A and the axis S of the pivotal connection P are perpendicular to each other, when these directions are in mutually intersecting planes. However, and as shown here, the direction F which defines the rotational connection A extends in a plane different from the plane in which the axis S which defines the pivot connection P extends, the two planes are secant to each other.

According to the invention, the wiper system <NUM> comprises a device for limiting the pivoting of the connecting member <NUM> and the driver <NUM> about the pivot connection P. This pivoting limitation device is more particularly visible in <FIG>. The pivot limiting means is configured here to block the pivoting of the connecting member <NUM> about the pivot connection P, i.e. to limit this pivoting to a defined angular sector in order to prevent the connecting member <NUM> from pivoting the wiper blade <NUM> too far. The pivot limiting means thus blocks the connecting member <NUM> in a first position or a second position, the connecting member <NUM> pivoting from one position to the other.

Each of the elements of the wiping system <NUM> will be described, before describing the cooperation of these elements with each other, with reference to <FIG>.

As illustrated in <FIG> and <FIG>, the driver <NUM> generally assumes an inclined shape and comprises a first portion <NUM> and a second portion <NUM>, the first portion <NUM> terminating at the second end <NUM> and extending along the axis S that defines the pivot connection P, and the second portion <NUM> terminating at the first end <NUM> and extending along a secant direction to the axis S that defines the pivot connection P. Here, the secant direction and the axis S which defines the pivot connection P form an angle between <NUM>° and <NUM>°, as a non-exhaustive example of the invention.

The driver <NUM> generally takes the form of a "U-shaped" section according to a cross-sectional view made in a plane in which the transverse axis T and the vertical axis V lie, with two side faces <NUM> and a top face <NUM> connecting the two side faces <NUM>, each face <NUM>, <NUM> extending from the first end <NUM> to the second end <NUM> of the driver <NUM>. At least in the first portion <NUM> of the driver <NUM>, each side face <NUM> extends in a plane parallel to the longitudinal L and vertical V axis, while the top face <NUM> extends in a plane parallel to the longitudinal L and transverse T axis. The upper face <NUM> and side faces <NUM>, <NUM> participate in delimiting a cavity <NUM>. The driver <NUM> also comprises a front face <NUM>, visible in <FIG>, extending in a plane parallel to the transverse axis T and vertical V, the front face <NUM> being located at the second end <NUM> of the driver <NUM> by joining the side faces <NUM> and the upper face <NUM>.

At its first end <NUM>, the driver <NUM> comprises a hole <NUM> configured to receive a shaft of the electric motor of the vehicle. The hole <NUM> extends along the vertical axis V passing through the top face <NUM> and within the cavity <NUM>. Here, the hole <NUM> takes a circular shape. However, a hole <NUM> taking another shape is included within the scope of the invention.

The driver <NUM> has a bore <NUM> at the second end <NUM> located through the front face <NUM> of the driver <NUM>. The bore <NUM> includes at least one through hole in the front face <NUM> connecting the cavity <NUM> to the exterior of the driver <NUM>. The bore <NUM> extends along the longitudinal axis L and is configured to cooperate with the connecting member <NUM> to form the pivotal connection P.

In addition, the driver <NUM> comprises a protrusion <NUM> emerging from one of the side faces <NUM> and extending along an axis parallel to the transverse axis T. More particularly, the protrusion <NUM> is located at the second end <NUM> and takes the form of a circular shaft. The protrusion <NUM> is configured to cooperate with a connecting member, an exemplary embodiment of which will be described in more detail below.

As shown in <FIG>, <FIG> and <FIG>, the connecting member <NUM> comprises a main body <NUM> and at least one pivotal element <NUM> extending from the main body <NUM> to the outside of the connecting member <NUM> along the longitudinal axis L. The pivotal element <NUM> is a cylinder-like pin having different sections among which are an end section <NUM> and at least one base section <NUM> located between the end section <NUM> and the main body <NUM>. The end section <NUM> differs from the base section <NUM> with a different diameter, and more particularly, the end section <NUM> has a smaller diameter than the diameter of the base section <NUM>. Furthermore, the base section <NUM> has a constant diameter. These technical features are only a non-limiting example of the pivot member <NUM>.

Advantageously, the end section <NUM> includes a notch <NUM> located circularly around the pivot member <NUM>. Furthermore, the notch <NUM> has a diameter smaller than the diameter of the end section <NUM>.

The connecting member <NUM> includes an axial locking device here in the form of a clip <NUM> configured to cooperate with the notch <NUM> of the pivot member <NUM>. The clip <NUM> is a curved rod that is elastically deformable. More specifically, the clip <NUM> deforms its initial structure to be assembled or disassembled on the pivot member <NUM> in the notch <NUM> and returns to its initial structure after being deformed. The clip <NUM> is used to hold the connecting member <NUM> once the pivot member <NUM> is received in the bore <NUM> of the driver <NUM>. To this end, the clip <NUM> has an inner diameter slightly larger than the diameter of the notch <NUM> to form a cooperation therewith when the clip <NUM> is assembled to the notch <NUM>. Further, the outer diameter of the clip <NUM> is greater than the diameter of the end section <NUM> and the diameter of the driver bore <NUM>.

In an alternative, variant embodiment (not shown), a starlock-type retaining ring may be used to retain the connecting member <NUM> in assembled position. Other, similar retention means may also be employed, without departing from the scope of the present invention.

As shown in <FIG>, the pivot member <NUM> is received within the bore <NUM> with the end section <NUM> partially disposed within the cavity <NUM> of the driver <NUM>. To this end, the diameter of the end section <NUM> is smaller than the diameter of the bore <NUM> to allow cooperation between the pivot member <NUM> and the bore <NUM>. The clip <NUM> is assembled to the notch <NUM> once the end section <NUM>, and more particularly the notch <NUM>, is disposed in the cavity <NUM> of the driver <NUM>.

The pivot element <NUM> and the bore <NUM> cooperate to form the pivot connection P which rotates about the axis S. Thus, the pivot element <NUM> and the connecting member <NUM> can be respectively moved about this pivot connection P in the bore <NUM> and the driver <NUM>.

As shown in <FIG> and <FIG>, the connecting member <NUM> includes a channel <NUM> that extends through the main body <NUM>, parallel to the transverse axis T. The channel <NUM> is circular, such as a hollow cylinder, and extends through the main body <NUM>. The channel <NUM> has a first end <NUM> located on a first side face <NUM> of the main body <NUM>, a second end of the channel <NUM> located on a second side face (not illustrated) of the main body <NUM>, the first and second side faces <NUM> of the main body <NUM> are perpendicular to the transverse axis T.

The channel <NUM> includes a crown <NUM> at least at the first end <NUM> as shown in <FIG>, or preferably at each end <NUM>. The crown <NUM> takes the form of a hoop projecting outwardly from the main body <NUM> along the transverse axis T.

The main body <NUM> further includes at least one hole <NUM> that extends through the main body <NUM> from the first lateral side <NUM> to the second lateral side. The hole <NUM> is like a hollow cylinder, similar to the channel <NUM>. However, the diameter of the hole <NUM> is smaller than the diameter of the channel <NUM>, the hole <NUM> and the channel <NUM> being distinct and independent from each other.

The channel <NUM> and the hole <NUM> of the connecting member <NUM> are configured to cooperate with the rod <NUM>, the connecting member <NUM> partially connecting the rod <NUM> and the driver <NUM>.

The device for limiting the pivoting of the connecting member <NUM> will now be described in more detail, in particular with reference to <FIG>.

As illustrated in <FIG>, the pivoting limitation device <NUM> comprises a groove <NUM> arranged on the driver <NUM> and a pin <NUM> projecting from the connecting member <NUM>, the pin <NUM> cooperating with the groove <NUM> to block the pivoting of the connecting member <NUM> about the axis S of the pivot connection P at a first end <NUM> of the groove <NUM> or at a second end <NUM> of the groove <NUM>. More precisely, the groove <NUM> is arranged in the front face <NUM> of the driver <NUM>, between the bore <NUM> and the upper face <NUM> along the vertical direction V. As for the pin <NUM>, it protrudes from the main body <NUM> along the longitudinal direction L from the face from which the pivoting element of the connecting member <NUM> protrudes.

According to an alternative of the invention, the pivoting limitation device <NUM> comprises a groove <NUM> arranged on the connecting member <NUM> and a pin <NUM> projecting from the driver <NUM>, the pin <NUM> cooperating with the groove <NUM> to block the pivoting of the connecting member <NUM> about the axis S of the pivot connection P at a first end <NUM> of the groove <NUM> or at a second end <NUM> of the groove <NUM>. It is understood that in this alternative, the groove <NUM> and the pin <NUM> are arranged in reverse to the arrangements described above. However, the cooperation between the groove <NUM> and the pin <NUM> are similar in this alternative of the invention.

According to still another alternative embodiment of the invention (not illustrated), more than one pair of groove and pin devices may be provided between the driver and the connecting member. In such a configuration, the grooves and pins should be offset about the axis S so as to avoid conflicting with each other. The grooves/pins may be disposed at equal angular intervals about the axis S (e.g. four groove-pin pairs disposed at <NUM>° intervals) to simplify construction and assembly, or alternatively disposed at unequal intervals to e.g. provide a keying effect.

Such a configuration may be preferable in that it provides additional resistance and rigidity to the blocking function of the groove-pin devices. The groove <NUM> has a curved shape between the first end <NUM> and the second end <NUM>. In other words, the groove <NUM> is inscribed in a circle whose center is coincident with the axis of the pivot connection.

Similarly, the pin <NUM> has a curved profile cooperating with the curved shape of the groove <NUM>. Similarly, the pin <NUM> is inscribed in a circle whose center is coincident with the axis of the pivot connection.

The curved shapes of the groove <NUM> and of the pin <NUM> allow the connecting member <NUM> to pivot about the axis S while blocking said pivoting when the pin <NUM> comes into abutment with either end <NUM>, <NUM> of the groove <NUM>.

It is understood that the pivoting limitation device <NUM> authorizes the pivoting of the connecting member <NUM> about the pivot linkage P through a trajectory corresponding to a predetermined angle. The predetermined angle may correspond to the normal angle of rotation of the wiper blade <NUM> as the wiper system moves from an extremity on the first portion of the windscreen <NUM> to an extremity on the second portion of the windscreen <NUM>. In such a configuration, the pivoting limitation device <NUM> effectively defines the endpoints of the rotation of the arm <NUM> about the axis S of the pivot connection P.

This limitation of the pivoting of the connecting member <NUM> about the pivot linkage thus blocks the pivoting of the wiper blade <NUM> so that the wiping strip <NUM> of the latter effectively wipes any portions of the glazed surface of the vehicle.

Thus, it can be defined that the pivoting limitation device <NUM> blocks the connecting member <NUM> in a first position and in at least a second position after pivoting of the connecting member <NUM> about the pivot linkage P. The first position of the connecting member <NUM> corresponds to the position of the connecting member <NUM> when the pin <NUM> is in contact with the first end <NUM> of the groove <NUM>, while the second position of the connecting member <NUM> corresponds to the position of the connecting member <NUM> when the pin <NUM> is in contact with the second end <NUM> of the groove <NUM>.

In an alternative configuration, the pivoting limitation device <NUM> may authorize the pivoting of the connecting member <NUM> about the pivot linkage P through a trajectory corresponding to a predetermined angle which is greater than the normal angle of rotation of the wiper blade <NUM> over its trajectory across the windscreen <NUM>.

In such a case, the pivoting limitation device <NUM> serves as a safety stop, preventing the connecting member <NUM> of the arm <NUM> from over-rotating, and consequently damaging the wiper system <NUM> and/or the windscreen <NUM>.

According to an aspect of the invention, and as illustrated in <FIG>, the wiping system includes a link member <NUM> configured to rotate at least the rod <NUM> of the arm <NUM> about the pivot link P relative to the driver <NUM>, the link member <NUM> being configured to force the pivoting of the rod <NUM> of the arm <NUM> about the pivot link P.

It is understood that the link member <NUM> is the element of the wiping system <NUM> that produces the force necessary to pivot the rod <NUM> and the connecting member <NUM> about the pivot connection P, via the kinematic relationship between the rod <NUM>, the connecting member <NUM>, and the driver <NUM> which is enforced by the link member <NUM>.

To this end, the link member <NUM> includes at least one lever <NUM> and at least one ball joint <NUM> disposed at one end of the lever <NUM>. In this example embodiment, the lever <NUM> has a central portion <NUM> extending rectilinearly between a first longitudinal end <NUM> and a second longitudinal end <NUM>, each longitudinal end <NUM>, <NUM> comprising a ball joint <NUM>.

More particularly, the lever <NUM> includes a housing at each longitudinal end <NUM>, <NUM> in which the ball joint <NUM> is disposed. Each housing comprises at least one spherical portion in which the ball joint <NUM> can be rotated. To this end, each spherical portion of the lever <NUM> has an inner spherical side configured to accommodate the ball joint <NUM> and allow rotation of said ball joint <NUM> within the spherical portion.

As shown in <FIG> and <FIG>, the lever <NUM> cooperates with the driver <NUM> by housing the first protrusion <NUM> in one of the ball joints <NUM>.

Advantageously, the rod <NUM> comprises a protrusion <NUM> extending along and parallel to the protrusion <NUM> of the driver <NUM>. The protrusion <NUM> of the rod <NUM> thus cooperates with the other ball joint <NUM> of the lever <NUM>. The lever <NUM> is held in position on the wiper system <NUM> by the tight guiding of each protrusion <NUM>, <NUM> in its respective ball joint <NUM>.

In addition, the rod <NUM> includes at least one spring member configured to hold the wiper blade of the wiper blade against the second portion of the glass surface. The spring member may include hooks at each of its longitudinal ends, one of the hooks engaging a shaft partially received in the hole <NUM>.

The present invention also relates to a method of wiping a glass surface by a wiping system as just described. During this wiping process, when the wiping system wipes the first portion <NUM> of the glazed surface, the connecting member <NUM> and the wiper blade <NUM> are in the first position, the pin <NUM> being then in contact with the first end <NUM> of the groove <NUM>.

When the wiping system <NUM> wipes the second portion <NUM> of the glass surface, the link member <NUM>, with the assistance of the spring element, guides the connecting member <NUM> and the wiper blade <NUM> pivotally about the pivot connection so that the connecting member <NUM> and the wiper blade <NUM> move from the first position to the second position. It is understood here that the pin <NUM> slides in the groove <NUM> from the first end <NUM> towards the second end <NUM> of the groove <NUM> when the wiper system is in transitional motion from the first portion <NUM> of the glass surface to the second portion <NUM> of the glass surface, across the curved surface <NUM>. When the pin <NUM> contacts the second end <NUM> of the groove <NUM>, the pivot limiting means <NUM> blocks the pivoting of the connecting member <NUM> and the wiper blade <NUM>, the latter being in the second position.

Claim 1:
A wiping system (<NUM>) for a glass surface (<NUM>) of a vehicle, the wiping system (<NUM>) comprising at least one wiper blade (<NUM>) for wiping the glass surface (<NUM>), and an arm (<NUM>) carrying the wiper blade (<NUM>) the arm (<NUM>) comprising:
- at least one driver (<NUM>), the driver (<NUM>) being configured to drive the wiper blade (<NUM>) in a reciprocating manner;
- a rod (<NUM>) at the end of which the wiper blade (<NUM>) is arranged;
- at least one connecting member (<NUM>) arranged between the rod (<NUM>) and the driver (<NUM>)
the arm (<NUM>) having a pivot connection (P) between the connecting member (<NUM>) and the driver (<NUM>) and a rotational connection (R) between the connecting member (<NUM>) and the rod (<NUM>)
the wiping system (<NUM>) comprising a means (<NUM>) for limiting the pivoting of the pivot connection (P) between the connecting member (<NUM>) and the driver (<NUM>),
characterized in that the pivot limiting means (<NUM>) comprises at least one groove (<NUM>) arranged on the driver (<NUM>) and at least one pin (<NUM>) projecting from the connecting member (<NUM>), and/or at least one groove (<NUM>) arranged on the connecting member (<NUM>) and at least one pin (<NUM>) projecting from the driver (<NUM>), said at least one pin (<NUM>) cooperating with said at least one groove (<NUM>) to block the pivoting of the connecting member (<NUM>) about the axis (S) of the pivot connection (P) at the level of the pivot connection (P), the pin (<NUM>) cooperating with the groove (<NUM>) to block the pivoting of the connecting member (<NUM>) about the axis (S) of the pivot connection (P) at a first end (<NUM>) of the at least one groove (<NUM>) or at a second end (<NUM>) of the at least one groove (<NUM>).