FR3021014A1 - TELESCOPIC WASHING DEVICE - Google Patents

Abstract

This telescopic washing device (1) comprises: - a body (10) having an inlet (11) and defining a chamber (12) for receiving washing liquid, - a movable member (20) comprising a piston ( 21) fluidly connected to the chamber (12) so that a pressure of the washing liquid in the chamber (12) can move the movable member (20) between: • a retracted position, and • a maximum output position, the movable member (20) having an outlet port connected to a projection member, and - a control member (40) of the washing liquid flow configured to extend into the conduit (22) when the movable member (20) is in the retracted position, the control member (40) having a peripheral surface (41), - a seal (50) including an elastically deformable portion (51) for preventing flow in the conduit (22), the seal (50) is connected to the piston (21) so that the elastically deformable portion (51) presses against e the peripheral surface (41). The peripheral surface (41) having passages (42) configured so that the washing liquid flows when the elastically deformable portion (51) is located opposite the passages (42).

Description

The present invention relates to a telescopic washing device for projecting a washing liquid to a surface to be cleaned of a motor vehicle, such as the window of a headlight or a rear light. The present invention applies to any motor vehicle, in particular to passenger vehicles, motorcycles, mopeds, commercial vehicles or industrial vehicles, for example of the truck type. The present invention can be applied to the field of the equipment of motor vehicles, either in original equipment (manufacture) or after-sales service in spare parts (repair). The present invention can be applied to the washing of headlights or the washing of a driving aid camera lens. FR2675758A1 discloses a telescopic device comprising: - a body defining a chamber for the washing liquid, - a movable member with a piston moved between in and out positions by a pressure of the washing liquid in the chamber, the movable member having a conduit leading to an exit port for spraying the washing liquid; and - a washing liquid flow control member which extends into the conduit and has an elongate peripheral surface. The telescopic device of FR2675758A1 further comprises two seals, including an O-ring mounted on the control member for sealing on a cylindrical surface forming the conduit, and an annular seal mounted against a cylindrical surface of the piston and against the wall of the room. However, the O-ring generates significant friction, which requires a high pressure of the washing liquid to move the piston, thus the movable member, and which decreases the service life of the telescopic washing device. However, this high pressure induces a relatively large flow of washing liquid leaking through the outlet orifice when the outlet orifice is passing.

In addition, the control member must have a cross section large enough to accommodate the O-ring. However, the larger this cross section, the greater the volume of washing liquid flowing through the outlet orifice is large when, after a spray of washing liquid, the movable member returns to the retracted position where the control member s' extends inside the duct, which further induces leakage of washing liquid. The present invention is intended in particular to solve, in whole or in part, the problems mentioned above. For this purpose, the invention relates to a telescopic washing device for projecting a washing liquid to a surface to be cleaned of a motor vehicle, such as a headlight or a rear light, the telescopic washing device comprising at least: - a body intended to be fixed to the motor vehicle, the body having at least one inlet for the washing liquid, the body being configured to define a chamber adapted to receive washing liquid, - an organ mobile device comprising a piston fluidly connected to the chamber so that a pressure of the washing liquid in the chamber can move the movable member between: - a retracted position, in which the movable member is at least partially housed in the body, and a maximum output position, in which at least one end portion of the movable member is out of the body, the retracted position and the extended position being offset along a mean axial section, the movable member having an outlet orifice adapted to be fluidly connected to a projection member for spraying washing liquid, the movable member defining a conduit adapted to conduct washing liquid to the outlet orifice, and a control member adapted to control the flow of washing liquid, the control member being configured to extend in the conduit at least when the movable member is in the retracted position, the control member having a peripheral surface; extending in the axial direction, - a seal comprising at least one elastically deformable part adapted to prevent a flow of washing liquid in the conduit, the telescopic washing device being characterized in that the seal is connected to the piston so that said at least one elastically deformable portion bears against the peripheral surface, the peripheral surface having at least one passage for the washing liquid, said at least one passage being configured so that the washing liquid flows through said at least one passage when said at least one elastically deformable portion is located opposite said at least one passage. In other words, the seal is mounted on the piston so as to press against the side surface of the control member. The control member performs a function similar to that of a needle. Thus, the control member may have a cross section of reduced dimensions, which limits the volume of leakage of washing liquid during the return of the control member in the retracted position. By way of comparison, the leakage volume of a telescopic device according to the invention may be less than 0.8 mL, or even 0.3 mL, while the leakage volume of a telescopic device of the art anterior is generally greater than 1.0 mL. According to a variant of the invention, the displacement of the movable member between the retracted position and the extended position may follow a rectilinear trajectory, in translation parallel or collinear to the axial direction.

Alternatively, the displacement of the movable member between the retracted position and the extended position may follow a curved path around the axial direction, for example a helical path. In the present application, the term "fluidically connected" means that washing liquid can flow between two fluidically connected elements, at least during a step of operation of the telescopic washing device. According to one embodiment of the invention, the seal is disposed on a surface of the piston which is generally perpendicular to the axial direction. Thus, such a seal extending mainly against an axial surface generates limited friction on the adjacent radial surfaces. Therefore, the washing liquid pressure necessary to move the movable member is relatively small, which limits the hydraulic power required for the operation of the telescopic washing device. According to a variant of the preceding embodiment, the piston has a shoulder, and the seal has a shape complementary to the shoulder. Thus, the seal is held firmly against the piston, which limits the risk of detachment of the seal. According to a variant of the invention, the chamber is configured to guide the movable member when the movable member moves in the axial direction, the chamber preferably being cylindrical with a circular base. Thus, no intermediate piece is disposed between the chamber and the piston, which / 26 minimizes the weight and bulk of the telescopic washing device. According to one embodiment of the invention, said at least one elastically deformable portion comprises an inner lip.

In other words, the seal is a lip seal. Thus, such an internal lip generates minimal friction against the peripheral surface, which makes it possible to minimize the pressure of the washing liquid. In addition, such an internal lip makes it possible to achieve a monodirectional seal, with a forward direction and a blocking direction, which allows the return of a large part of the washing liquid to the inlet orifice, thus to a remote reservoir during the return of the movable member in the retracted position. According to one embodiment of the invention, the seal further comprises at least one outer lip arranged to press against the chamber.

Thus, such an outer lip generates minimal friction against the chamber, which allows to minimize the pressure of the washing liquid. According to one embodiment of the invention, the peripheral surface has at least a first section and a second section offset in the axial direction, said at least one passage being formed in the second section so that the surface of a cross section the second section is smaller than the area of a cross section of the first section Thus, such a first section allows to define at least one passage with precise dimensions, and therefore to control the flow of the washing liquid in the or each passage . According to one embodiment of the invention, the peripheral surface has several passages distributed around the axial direction. Thus, several passages allow the flow of a large flow of washing liquid. According to one embodiment of the invention, the passages are arranged substantially at the same dimension, measured from a free end of the control member. Thus, such passages, arranged for flows "in parallel", allow to distribute the flow of washing liquid around the control member. An even distribution of the flow of washing liquid / 26 balances the piston and the movable member, thus the wear of the seal, which maximizes the service life of the seal. According to one embodiment of the invention, the peripheral surface has several passages distributed along the axial direction. Thus, such passages, arranged for "series" flows, make it possible to perform intermittent projections of washing liquid during a complete stroke of the movable member between the retracted position and the extended position.

According to one embodiment of the invention, at least one passage is composed of a groove formed on the peripheral surface. Thus, such a groove makes it possible to carry out a passage in a simple manner, thus economical. According to a variant of the invention, said at least one groove has a generally rectangular shape. Alternatively, said at least one groove may have a curved shape, for example a helical shape around the axial direction. Moreover, at least one groove may have a variable width, measured orthogonally to the axial direction. Thus, a groove of variable width makes it possible to vary the flow of washing liquid sprayed during the projection. According to a variant of the invention, the peripheral surface is cylindrical, for example circular base, an axis of the peripheral surface being substantially parallel or collinear with the axial direction. Thus, such a cylindrical peripheral surface involves mounting a rotationally symmetrical seal, thus of simple shape. Alternatively to a cylindrical base, the peripheral surface may have a non-circular base, for example elliptical or rectangular to rounded apex. Therefore, the chamber has a variable volume defined by the position of the movable member with the piston along the axial direction. Depending on the geometries of the piston and the body, the chamber may have a small or no volume when the movable member is in the retracted position. According to a variant of the invention, the chamber is configured to guide the movable member when the movable member moves in the axial direction, the chamber preferably being cylindrical with a circular base and axis 35 parallel or collinear to the direction axial. According to a variant of the invention, the movable member generally has a tubular and rectilinear shape, the movable member extending parallel or collinear to the axial direction. Thus, said at least one duct is rectilinear and extends parallel or collinear to the axial direction.

Advantageously, the duct may have a cylindrical shape, preferably with a circular base and an axis parallel or collinear with the axial direction. According to a variant of the invention, the piston is integral with the movable member. For example, the piston and the movable member may be monoblock, which eliminates the provision of sealing components between piston and movable member. Alternatively, the piston and the movable member are separate and joined together. According to a variant of the invention, the body comprises a connection piece defining said at least one inlet orifice.

According to a variant of the invention, the telescopic washing device further comprises a projection member fluidly connected to said at least one outlet orifice, the projection member being adapted to project washing liquid, the projection member being preferably linked to an end portion of the movable member. For example, the projection member may comprise one or more nozzles (s). The projection member may be either integral with the movable member is attached to the movable member or a workpiece connected to the movable member. According to a variant of the invention, said at least one projection member comprises a valve movable between a closed position, in which the valve closes the duct, and an open position, in which the valve disengages the duct. This valve may comprise i) a ball adapted to bear against a seat disposed at the downstream end of the duct, and ii) an elastic return element calibrated to return the ball in the closed position when the washing liquid pressure is below a pressure threshold.

Alternatively, said at least one projection member may be without a valve. According to one embodiment of the invention, the control member extends substantially in the axial direction. In particular, the peripheral surface generally has an elongated shape in the axial direction. For example, the control member may have a finger or needle shape. Alternatively, the control member may define a hollow space and open to the conduit. According to one embodiment of the invention, the control member has transverse dimensions, measured perpendicularly to the axial direction, of less than 7 mm, preferably less than 4 mm. Thus, such transverse dimensions make it possible to minimize the volume of leakage of washing liquid during the return of the movable member in the retracted position. According to a variant of the invention, the duct has transverse dimensions, measured perpendicular to the axial direction, of less than 7 mm, preferably less than 4 mm. According to a variant of the invention, the control member has, in cross section perpendicular to the axial direction, an area of less than 19 mm 2, preferably less than 12 mm 2.

According to one embodiment of the invention, the control member is fixed relative to the body, the control member being preferably attached to the body. Thus, such a fixed control member allows simple manufacture of the telescopic washing device. When the control member is attached to the body, it is not monobloc (material) with the body, which simplifies the manufacture of the body. According to an alternative embodiment of the invention, the control member extends from a part of the body which is opposite to the outlet orifice. Thus, such a position of the control member makes it possible to define a compact telescopic washing device. According to one embodiment of the invention, the control member is movable relative to the body, wherein the control member has a housing, the telescopic washing device further comprising a guide integral with the body and configured to expand. in the housing so as to guide the control member in translation in the axial direction, the guide having an axial stop arranged to stop the translation of the control member after a predetermined stroke. Thus, such a mobile control member and such a guide to stop the leakage of liquid as soon as the seal presses against the movable member. Indeed, in this support position, the volume of liquid between the seal and the outlet orifice no longer evolves. According to one embodiment of the invention, the control member comprises at least one peripheral ring, the peripheral ring extending in the chamber and transversely to the axial direction so that the washing liquid can exert pressure on the ring. device to move the control member. Thus, such a peripheral ring allows a simultaneous movement of the guide with the piston, so with the movable member, until the axial stop stops the movement of the guide. According to one embodiment of the invention, the area of a cross section of the peripheral ring is smaller than the area of a cross section of the piston. In other words, the peripheral ring does not cover the entire piston. Thus, such a peripheral ring allows the washing liquid to exert pressure on the piston, including when the axial stop stops the movement of the guide. According to one embodiment of the invention, the telescopic washing device further comprises a return member arranged between the body and the movable member so as to exert a return force on the movable member to the retracted position. According to a variant of the invention, the control member is composed of a central finger and a housing, which defines with the piston an intermediate chamber, the housing having orifices which are arranged to fluidly connect the chamber and the chamber intermediate. Advantageously, the housing has transverse dimensions adjusted, with a functional clearance, to the transverse dimensions of the chamber. Advantageously, the telescopic washing device comprises a secondary seal which is disposed on an outer surface of the housing facing the chamber and which is configured to seal against a side wall of the chamber. Thus, such a return member makes it possible to return the movable member from the extended position to the retracted position, thus to "close" the telescopic washing device. According to a variant of the invention, the return member is elastically deformable. Advantageously, the return member is a helical spring arranged to work in compression. The embodiments and variants mentioned above may be taken individually or in any technically permissible combination. The present invention will be well understood and its advantages will also emerge in the light of the description which follows, given solely by way of nonlimiting example and with reference to the appended drawings, in which: FIG. 1 is a perspective view exploded telescopic washing device according to a first embodiment of the invention; FIG. 2 is an enlarged view of detail II in FIG. 1; - Figure 3 is a sectional view along the plane III in Figure 1, the telescopic washing device of Figure 1 in the retracted position; FIG. 4 is a view similar to FIG. 3, on a smaller scale, of the telescopic washing device of FIG. 1 in an intermediate position, in which the washing liquid can not flow through each passage; - Figure 5 is a view similar to Figure 4 of the telescopic washing device of Figure 1 in a subsequent intermediate position; FIG. 6 is a view similar to FIG. 4 of the telescopic washing device of FIG. 1 in an intermediate position in which the washing liquid can flow through each passage; - Figure 7 is a view similar to Figure 3 of the telescopic washing device of Figure 1 in the extended position; FIG. 8 is a view, on a larger scale, of detail VIII in FIG. 4; FIG. 9 is a view, on a larger scale, of the detail IX in FIG. 5; Fig. 10 is an enlarged view of detail X in Fig. 6; FIG. 11 is a view, on a larger scale, of detail XI in FIG. 7; - Figure 12 is an exploded perspective view of a telescopic washing device according to a second embodiment of the invention; FIG. 13 is an enlarged view of detail XIII in FIG. 12; - Figure 14 is a sectional view, similar to Figure 3, the telescopic washing device of Figure 1 in the retracted position; FIG. 15 is a view similar to FIG. 14, on a smaller scale, of the telescopic washing device of FIG. 14 in an intermediate position, in which the washing liquid can not flow through each passage; - Figure 16 is a view similar to Figure 15 of the telescopic washing device of Figure 15 in a subsequent intermediate position; - Figure 17 is a view similar to Figure 14 of the telescopic washing device of Figure 14 in the extended position; FIG. 18 is a view, on a larger scale, of detail XVIII in FIG. 15; FIG. 19 is a view, on a larger scale, of detail XIX in FIG. 16; FIG. 20 is a view, on a larger scale, of detail XX in FIG. 17; - Figure 21 is a view similar to Figure 9 of a portion of a telescopic washing device according to a third embodiment of the invention; FIG. 22 is a front view of a front headlight pane illustrating the zones for spraying washing liquid by the telescopic washing device of FIG. 21; FIG. 23 is an exploded perspective view of a telescopic washing device according to a fourth embodiment of the invention; Fig. 24 is an enlarged view of the detail) (XIV in Fig. 23; Fig. 25 is a sectional view, similar to Fig. 3, of the telescopic washing device of Fig. 23 in position; Figure 26 is a view similar to Figure 25, on a smaller scale, of a portion of the telescopic washing device of Figure 25 in an intermediate position, in which the washing liquid can not flow. Fig. 27 is a view similar to Fig. 26 of a portion of the telescopic washing device of Fig. 26 in a subsequent intermediate position, in which the washing liquid can flow through first passages; Figure 28 is a view similar to Figure 27, on a smaller scale, of a portion of the telescopic washing device of Figure 27 in an intermediate position, in which the washing liquid can not flow; 29 is a view similar to Figure 28 of a portion of the telescopic washing device of Figure 28 in a subsequent intermediate position, in which the washing liquid begins to flow through second passages; - Figure 30 is a view similar to Figure 29 of a portion of the telescopic washing device of Figure 29 in the extended position; FIG. 31 is a view, on a larger scale, of the detail XXXI in FIG. 25; FIG. 32 is a view, on a larger scale, of detail XXXII in FIG. 26; FIG. 33 is a view, on a larger scale, of detail XXXIII in FIG. 27; Fig. 34 is an enlarged view of detail XXXIV in Fig. 28; FIG. 35 is a view, on a larger scale, of the detail XXXV in FIG. 29; Fig. 36 is an enlarged view of detail XXXVI in Fig. 30; - Figure 37 is a sectional view, similar to Figure 6, of a telescopic washing device according to a fifth embodiment of the invention, in the extended position; and FIG. 38 is an enlarged view of the detail) (XXVIII in FIG. 37. FIGS. 1 to 11 illustrate a telescopic washing device 1, which is intended to project a washing liquid towards a surface at non-illustrated cleaning of a motor vehicle, for example a headlight or a rear light.The telescopic washing device 1 comprises i) a body 10, ii) a movable member 20 having a piston 21, iii) a control member 40 adapted to control the flow of washing liquid and iv) a seal 50 for sealing. The body 10 is intended to be fixed to the motor vehicle by means of a fastener 8. The body 10 has an inlet port 11 for the entry of the washing liquid into the body 10. In the example of the figures 1 to 11, the body 10 comprises a connecting piece 11.1 defining the inlet orifice 11. The body 10 is configured to define a chamber 12, which is adapted to receive washing liquid entering through the orifice of 11. The piston 21 carried by the movable member 20 is fluidly connected to the chamber 12 so that a pressure P (symbolized in Figure 8) of the washing liquid in the chamber 12 can move the movable member 20 between A retracted position (FIG. 3), in which the movable member 20 is housed in the body 10, and a maximum output position (FIG. 7), in which an end portion of the movable member 20 is out of the body 10; in the example of FIG. 7, this end portion represents approximately two thirds of the length of the movable member 20. The retracted position (FIG. 3) and the extended position (FIG. 7) are offset along An axial direction X. The displacement of the movable member 20 between the retracted position (FIG. 3) and the extended position (FIG. 7) follows a rectilinear trajectory in translation colinear with the axial direction X. The chamber 12 is configured to guide the movable member 20 when the movable member 20 moves in the axial direction X. In this case, the chamber 12 is cylindrical with a circular base and axis collinear with the axial direction X. The piston 21 is here integral with the movable member 20, because the piston 21 and the movable member 20 are monobloc. The chamber 12 thus has a variable volume defined by the position of the movable member 20 with the piston 21 along the axial direction X. The chamber 12 here has a low minimum volume when the movable member 20 is in the retracted position ( Figure 3). The telescopic washing device 1 further comprises a return member 70 which is arranged between the body 10 and the movable member 20 so as to exert a return force F70 (FIG. 11) to bias the movable member 20 towards the position back in (Figure 3). In this case, the return member 70 is a helical spring arranged to work in compression. The return member 70 is elastically deformable.

The movable member 20 has an outlet orifice 20.1 intended to be fluidly connected to a projection member 60 for spraying washing liquid. As shown in Figures 10 and 11, the movable member 20 defines a conduit 22 adapted to conduct washing liquid to the outlet port 20.1, thus to the projection member 60.

The projection member 60 here comprises a nozzle. The projection member 60 is here without a closure valve. The projection member 60 is connected to an end portion of the movable member 20. The projection member 60 is here attached to the movable member 20. The control member 40 is adapted to control the flow of liquid washing, as detailed below. The control member 40 is configured to extend into the conduit 22 when the movable member 20 is in the retracted position (Figure 3). The control member 40 performs a function similar to that of a needle. In the example of Figures 1 to 11, the control member 40 is fixed relative to the body 10. The control member 40 extends substantially in the axial direction X and from a portion of the body 10 which is opposite at the outlet 20.1. As shown in FIG. 1 or 7, the control member 40 has a peripheral surface 41 extending in the axial direction X.

The peripheral surface 41 thus has an elongated shape along the axial direction X. In addition, the control member 40 here has a hollow finger or needle shape and is open at its downstream end 40.5 towards the duct 22. In FIG. example of Figures 1 to 11, the movable member 20 has a generally tubular shape, rectilinear and collinear to the axial direction X.

The peripheral surface 41 generally has the shape of a cylinder with a circular base and an axis collinear with the axial direction X. In a complementary manner, the duct 22 has the overall shape of a cylinder with a circular base and a collinear axis with the axial direction X. As shown in FIG. 11, on the one hand, the control member 40 has a diameter D40 (transverse dimension), measured on the peripheral surface 41 and perpendicular to the axial direction X, which is approximately equal to 5 mm. On the other hand, the duct 22, defined by the movable member 20, has a diameter D22 (transverse dimension), measured perpendicularly to the axial direction X, which is here approximately equal to 6 mm.

Thus, the control member 40 has a cross section of reduced dimensions, which limits the volume of washing liquid leakage during the return of the control member 40 in the retracted position (Figure 3). As shown in FIG. 9, the seal 50 comprises an elastically deformable portion 51 which is adapted to prevent a flow of washing liquid in the conduit 22. In the example of FIGS. 1 to 11, the seal 50 is a lip seal and the elastically deformable portion 51 comprises an inner lip, that is, turned towards the inside of the conduit 22. The seal 50 further comprises an outer lip 52 which is arranged to bear against the chamber 12.

The seal 50 is connected to the piston 21 so that the elastically deformable portion 51 bears against the peripheral surface 41. Since the peripheral surface 41 has a generally cylindrical shape, the elastically deformable portion 51 bears against a radial surface, that is to say that is normal to the axial direction X. In other words, the seal 50 is mounted on the piston 21 so as to press against the peripheral or lateral surface of the control member 40. As shown in FIG. 9, the seal 50 is here disposed on a surface of the piston 21.1 which is generally perpendicular to the axial direction X. In addition, the piston 21 has a shoulder and the seal 50 has a shape complementary to this shoulder. As shown in FIG. 10, the seal / 26 50 defines a frustoconical inner surface 53 converging towards the elastically deformable portion 51. As shown in FIG. 2, the peripheral surface 41 has passages 42 for the washing liquid. Each passage 42 is configured so that the washing liquid flows through the respective passage 42 when the elastically deformable portion 51 is located opposite the respective passage 42. In this case, the peripheral surface 41 has several passages 42 distributed around the axial direction X. The passages 42 are arranged substantially at the same dimension, measured from a free end 40.5 of the control member 40. As shown in Figures 3 and 9, the peripheral surface 41 has a first section 43.1 and a second section 43.2. The first section 43.1 and the second section 43.2 are offset in the axial direction X.

Each passage 42 is formed in the first section 43.1 so that the cross sectional area of the second section 43.2 is smaller than the area of a cross section of the first section 43.1. In the example of FIGS. 1 to 11, each passage 42 is composed of a groove formed on the peripheral surface 41, as shown in FIG. 2. Each groove constituting a passage 42 has a generally rectangular shape when viewed from the front . Figures 4 to 7 and 8 to 11 illustrate a sequence of use of the telescopic washing device 1. The movable member 20 is initially in the retracted position (Figure 3). The washing liquid enters the inlet port 11 and fills the chamber 12. The pressure P of the washing liquid pushes the piston 21, thus the movable member 20, against the return member 70. The chamber 12 increases in volume. Then, the movable member 20 reaches the position illustrated in Figure 4 or 8, wherein the seal 50, with its elastically deformable portion 51, 30 bears against the first section 43.1 of the peripheral surface 41. As this first section 43.1 is without passages 42, the washing liquid is maintained in the chamber 12 under the pressure P. Then, the movable member 20 reaches the position shown in Figure 5 or 9, wherein the seal 50, with its elastically deformable portion 51 35 is next to the beginning of the passages 42. The liquid will then begin to flow through the passages 42. Then, when the movable member 20 is around the position illustrated in FIG. 6 or 10, the seal 50, with its elastically deformable portion 51, is opposite the passages 42 and the second section 43.2. During this phase, the liquid flows through the passages 42, as symbolized by the arrows L in FIGS. 6 and 10. The pressure P continues to move the piston 21 and the movable member 20. Finally, the movable member 20 reaches the outlet position illustrated in Figure 7 or 11, wherein the pressure P is decreased by the interruption of a pump unit not shown which is located upstream of the telescopic washing device 1. The return member 70 exerts a return force F70 greater than the pressure P, so that the movable member 20 descends to the retracted position. During its return to the retracted position, the movable member 20 returns by the positions illustrated in Figures 6, 5, 4 and 3. The washing liquid present in the chamber 12 is expelled to the source of liquid not shown which is located upstream of the telescopic washing device 1. The washing liquid present in the conduit 22 will remain in the conduit 22. The leakage volume of washing liquid out of the projection member 60 is low because it corresponds the small volume of the control member present in the conduit 22 in the retracted position (Figure 3). Figures 12 to 20 illustrate a telescopic washing device 101 according to a second embodiment of the invention. Since the telescopic washing device 101 is similar to the telescopic washing device 1, the description of the telescopic washing device 1 given above in connection with FIGS. 1 to 11 can be transposed to the telescopic washing device 101, except for the notable differences set out below. A component of the telescopic washing device 101 identical or corresponding, by its structure or function, to a component of the telescopic washing device 1 has the same numerical reference increased by 100. Thus defines a fastener 108, a body 110 with an inlet orifice 111, a chamber 112, a movable member 120 with a piston 121 and a conduit 122, a control member 140 having a peripheral surface 141 with a first section 143.1 and a second section 143.2, passages 142, a seal 150 with an elastically deformable portion 151, a projection member 160 and a return member 170. / 26 The telescopic washing device 101 differs from the telescopic washing device 1, since the control member 140 is generally finger-shaped full, while the control member 40 has generally a hollow and open finger shape.

In addition, the telescopic washing device 101 differs from the telescopic washing device 1, since the control member 140 has transverse dimensions (diameter) substantially smaller than the transverse dimensions of the control member 40. Thus, the control member 140 allows to minimize the diameter of the conduit 122. In addition, as the volume of the control member 140 is reduced, the volume of leakage of washing liquid is particularly small. Figure 21 illustrates a telescopic washing device 501 according to a third embodiment of the invention. Since the telescopic washing device 501 is similar to the telescopic washing device 1, the description of the telescopic washing device 1 given above in connection with FIGS. 1 to 11 can be transposed to the telescopic washing device 501, except for the notable differences set out below. A component of the telescopic washing device 501 identical or corresponding, in structure or function, to a component of the telescopic washing device 1 has the same numerical reference increased by 500. Thus a body 510, a chamber 512, a movable member 520 with a piston 521 and a conduit 522, a control member 540 having a peripheral surface 541, and a seal 550.

The telescopic washing device 501 differs from the telescopic washing device 5 because the peripheral surface 541 of the control member 540 has a plurality of passages 542.1, 542.2 which are distributed along the axial direction X. As for the peripheral surface 41, the passages 542.1, 542.2 are distributed around the axial direction X and each passage 542.1, 542.2 is formed by a groove parallel to the axial direction X. On the other hand, the peripheral surface 541 thus has four successive sections 543.1, 543.2, 543.3 and 543.4, while that the peripheral surface 41 has only two sections 43.1 and 43.2. As shown in Figure 21, the passages 542.1, 542.2 are provided on the sections 543.2 and 543.4, while the sections 543.1 and 543.3 do not have passages 542.1, 542.2. In other words, the sections 543.2 and 543.4 allow the flow of washing liquid, while the sections 543.1 and 543.3, in cooperation with the seal 50, block the washing liquid. The presence of these four successive sections 543.1, 543.2, 543.3 and 543.4 makes it possible to perform intermittent projections of washing liquid during a complete stroke of the movable member between the retracted position and the extended position. In operation, when the pressure of the washing liquid pushes the piston 521 and moves the movable member 520, there are four operating phases: a) the section 543.1 and the seal 550 block the washing liquid, while the movable member 520 is coming out gradually; in addition, the movable member 520 rotates about itself around the axial direction X, by means of a helical guide known per se b) the section 543.2 and its passages 542.1 make it possible to perform a first projection of washing liquid to a first zone 504.1 of a headlight 504; the movable member 520 continues to go out and turn on itself; c) the section 543.3 and the seal 550 block the washing liquid, while the movable member 520 continues out and turn on itself; d) the section 543.4 and its passages 542.2 make it possible to perform a second projection of washing liquid to a second zone 504.2 of the headlight 504; the movable member 520 reaches its output position. Thus, the presence of these four successive sections 543.1, 543.2, 543.3 and 543.4, with the two series of passages 542.1 and 542.2, make it possible to wash only the first zone 504.1 and the second zone 504.2, which minimizes the consumption of washing liquid. . Figures 23 to 36 illustrate a telescopic washing device 201 according to a fourth embodiment of the invention. Since the telescopic washing device 201 is generally similar to the telescopic washing device 1, the description of the telescopic washing device 1 given above in connection with FIGS. 1 to 11 can be transposed to the telescopic washing device. 201, except for the notable differences set out below. A component of the telescopic washing device 201 identical or corresponding, by its structure or its function, to a component of the telescopic washing device 1 has the same reference numeral increased by 200. Thus defines a fastener 208, a body 210 with an inlet orifice 211, a chamber 212, a movable member 220 with a piston 221 and a conduit 222, a control member 240 having a peripheral surface 241, a seal 250 with an elastically deformable portion 251, a projection 260 and a return member 270. The telescopic washing device 201 differs from the telescopic washing device 1, since: the control member 240 is movable relative to the body 210, the control member 240 has a housing 245, The telescopic washing device 201 further comprising a guide 205 which is integral with the body 210 and which is configured to extend into the housing 245 so as to guide the m The guide 205 has an axial stop 205.1 which is arranged to stop the translation of the control member 240 after a predetermined stroke. In addition, the telescopic washing device 201 differs from the telescopic washing device 1 since the control member 240 has a peripheral ring 246. The peripheral ring 246 extends into the chamber 212 and transverse to the axial direction X, of so that the washing liquid can exert a pressure P246 on the peripheral ring 246 so as to move the control member 240, which is movable relative to the body 210. The cross sectional area of the peripheral ring 246 is less than on the surface of a cross section of the piston 221. In other words, the peripheral ring 246 does not cover the entire piston 221. Thus, the peripheral ring 246 allows the washing liquid to exert a pressure on the piston 221 , even when the axial stop 205.1 stops the movement of the guide 205. To allow the flow of the washing liquid, the peripheral surface 241 of the control member 240 can feel four sections 243.1, / 26, 243.2, 243.3 and 243.4. These four sections 243.1, 243.2, 243.3 and 243.4 have the same structure and fulfill the same function as the four sections 543.1, 543.2, 543.3 and 543.4 described above in relation to Figures 21 and 22. The description of the structure and the function of the four sections 543.1, 543.2, 543.3 and 543.4, in cooperation with the joint 550, can therefore be transposed to the four sections 243.1, 243.2, 243.3 and 243.4, in cooperation with the joint 250. In operation, as the control member 240 is mobile, the telescopic washing device 201 differs from the telescopic washing device 1, because the return of the movable member 220 is first by the return of the piston 221 on the control member 240 under the effect of the counterpressure of the washing liquid contained in the chamber 212. Then, the control member 240 leaves the axial stop 205.1, so that the assembly formed by the movable member 220 and the control member 240 is returned to the bottom of the body210 and the inlet orifice 211 by the return member 270 under the effect of the counterpressure of the washing liquid contained in the chamber 212. Figures 37 and 38 illustrate a telescopic washing device 301 in a fifth mode embodiment of the invention. Since the telescopic washing device 301 is similar to the telescopic washing device 201, the description of the telescopic washing device 201 given above in connection with FIGS. 23 to 36 can be transposed to the telescopic washing device 301, except for the notable differences set out below. A component of the telescopic washing device 301 identical or corresponding, by its structure or function, to a component of the telescopic washing device 201 has the same numerical reference increased by 100. Thus defines a fastener 308, a body 310 with an inlet port 311, a chamber 312, a movable member 320 with a piston 321 and a conduit 322, a control member 340 having a peripheral surface 341, a seal 350 with an elastically deformable portion 351, a housing member 360 projection and a return member 370. As for the telescopic washing device 201, the control member 340 is movable relative to the body 310. The telescopic washing device 301 differs from the telescopic washing device 201 because the control member 340 is composed of a central finger 340.1, but also a casing 340.2. The housing 340.2 and the piston 321 define an intermediate chamber 312.2, which can contain a variable volume of washing liquid, depending on the relative displacement between the piston 321 and the control member 340. The housing 340.2 has orifices 340.3 which are arranged to fluidly connect the chamber 312 and the intermediate chamber 312.2.

The housing 340.2 has transverse dimensions adjusted, with a functional clearance, to the transverse dimensions of the chamber 312. Thus, the upstream portion of the control member 340 is guided only by the sliding of the housing 340.2 in the chamber 312. Therefore, the 340.2 box exempts to add a guide attached to the body 310, such as the guide 205, which simplifies the manufacture of the body 310 and the assembly of the telescopic washing device. Indeed, it eliminates the operation, performed without visual control, consisting of fixing a guide to the bottom of the body. In addition, the telescopic washing device 301 differs from the telescopic washing device 201, since it comprises a secondary seal 350.2 which is disposed on an outer surface of the housing 340.2 facing the chamber 312. The secondary seal 350.2 is configured to perform a sealing against a side wall of the chamber 312. The operation during the return of the movable member 320 in the retracted position (not shown) is similar to the operation described in connection with Figures 23 to 36. The telescopic washing device 301 allows avoid any leakage of washing liquid after the piston 321 is located opposite the upstream portion of the control member 340. In addition, the telescopic washing device 301 differs from the telescopic washing device 201, because the fixation 308 fulfills the function of axial stop for the control member 340 when the movable member 320 reaches the extended position (not shown) . Thus, this stop formed by the fixing member 308 dispenses with forming a complex axial stop, such as the axial abutment 205.1 formed on the guide 205.

Of course, the present invention is not limited to the particular embodiments described in the present patent application, nor to embodiments within the scope of those skilled in the art. Other embodiments may be envisaged without departing from the scope of the invention, from any element equivalent to an element indicated in the present patent application.

Claims (16)

REVENDICATIONS1. A telescopic washing device (1; 101; 201; 301; 501) for projecting a washing liquid to a surface to be cleaned (504) of a motor vehicle, such as a headlight or a rear light, the device telescopic washing device (1-501) comprising at least: - a body (10; 110; 210; 310; 510) for attachment to the motor vehicle, the body (10-510) having at least one inlet port ( 11; 111; 211; 311) for the washing liquid, the body (10-310) being configured to define a chamber (12; 112; 212; 312) adapted to receive washing liquid; 120; 220; 320; 520) having a piston (21; 121; 221; 321; 521) fluidly connected to the chamber (12-312) so that a pressure of the washing liquid in the chamber (12-312 ) can move the movable member (20-520) between: - a retracted position, wherein the movable member (20-520) is at least partially housed in the body (10-510), and - a position d e maximum output, wherein at least one end portion of the movable member (20-520) is output from the body (10-510), the retracted position and the output position being offset along an axial direction ( X), the movable member (20-520) having an outlet (20.1) adapted to be fluidly connected to a projection member for spraying washing liquid, the movable member (20-520) defining a conduit ( 22; 122; 222; 322) adapted to conduct washing liquid to the outlet (20.1), and - a control member (40; 140; 240; 340; 540) adapted to control the flow of washing liquid, the control member (40-540) being configured to extend into the conduit (22-522) at least when the movable member (20-520) is in the retracted position, the control member (40540) having a peripheral surface (41; 141; 241; 341; 541) extending in the axial direction (X); - a seal (50-550) comprising at least one elastically deformable portion (51; 151; 251; 351; 551) adapted to prevent flow; of washing liquid in the conduit (22-322), the telescopic washing device (1-501) being characterized in that the seal (50-550) is connected to the piston (21-521) so that the at least one an elastically deformable portion (51-551) bears against the peripheral surface (41-541), the peripheral surface (41-541) presenting at least one pass ge (42; 142; 242.1, 242.2; 542.1, 542.2) for the washing liquid, said at least one passage (42 - 542.2) being configured so that the washing liquid flows through said at least one passage ( 42 - 542.2) when said at least one elastically deformable portion (51-351) is located opposite said at least one passage (42-542.2). The telescopic washing device (1-501) according to claim 1, wherein the seal (50-550) is disposed on a surface of the piston (21.1, 121.1, 221.1) which is generally perpendicular to the axial direction (X) . The telescopic washing device (1-501) according to any one of the preceding claims, wherein said at least one elastically deformable portion (51-551) comprises an inner lip. The telescopic washing device (1; 101; 201; 501) according to any one of the preceding claims, wherein the seal (50; 150; 250; 550) further comprises at least one outer lip (52; 152; 252) arranged to bear against the chamber (12-512). A telescopic washing device (1-501) according to any one of the preceding claims, wherein the peripheral surface (41-541) has at least a first section (43.1; 143.1; 243.1) and a second section (43.2; 143.2; 243.2) offset in the axial direction (X), said at least one passage (42 - 542.2) being provided in the second section (43.2; 143.2) so that the cross-sectional area of the second section (43.2; 143.2; 243.2) is less than the area of a cross-section of the first section (43.1; 143.1; 243.1). A telescopic washing device (1-501) according to any one of the preceding claims, wherein the peripheral surface (41-541) has a plurality of passages (42-542.2) distributed about the axial direction (X). The telescopic washing device (101; 201; 301) according to claim 6, wherein the passages (142; 242.1,242.2) are arranged substantially at the same dimension, measured from a free end of the control member ( 140; 240; 340). A telescopic washing device (101; 201) according to any one of the preceding claims, wherein the peripheral surface (141; 241) has a plurality of passages (142; 242.1,242.2) distributed along the axial direction (X). . The telescopic washing device (1-501) according to any preceding claim, wherein at least one passage (42 - 542.2) is composed of a groove on the peripheral surface (41-541). The telescopic washing device (1-501) according to any one of the preceding claims, wherein the control member (40-540) extends substantially in the axial direction (X). 20 A telescopic washing device (101-501) according to any one of the preceding claims, wherein the control member (140-540) has transverse dimensions, measured perpendicular to the axial direction (X), of less than 7 mm preferably less than 4 mm. The telescopic washing device (1; 101) according to any one of the preceding claims, wherein the control member (40; 140) is fixed relative to the body (10; 110), the control member (40; 140) being preferably attached to the body (10; 110). The telescopic washing device (201; 301) according to any one of claims 1 to 11, wherein the control member (240; 340) is movable relative to the body (210; 310), wherein the limb (240; control device (240; 340) has a housing (245), the telescopic washing device (201; 301) further comprising a guide (205) integral with the body (210; 310) and configured to extend into the housing (245) so as to guide the control member (240; 340) in translation in the axial direction (X), the guide (205) having an axial stop (205.1) arranged to stop the translation of the control member (240); 340) after a predetermined race. The telescopic washing device (201; 301) according to claim 13, wherein the control member (240; 340) has at least one peripheral ring (246), the peripheral ring (246) extending into the chamber ( 212) and transversely to the axial direction (X) so that the washing liquid can exert pressure on the peripheral ring (246) so as to move the control member (240; 340). The telescopic washing device (201; 301) according to any one of claims 13 to 14, wherein the cross-sectional area of the circumferential ring (246) is smaller than the area of a cross section of the piston. (221). The telescopic washing device (1-501) according to any one of the preceding claims, wherein the telescopic washing device (1-501) further comprises a return member (70; 170; 270; 370) arranged between the body (10-510) and the movable member (20-520) so as to exert a return force (F70) on the movable member (20-520) towards the retracted position.