FR2781743A1 - Device, for projecting washing liquid on to vehicles windows, has non return valve fitted at inlet to main chamber to prevent liquid from draining down - Google Patents

Abstract

The projecting device consists of a case (22), in which is formed a chamber (28), which is supplied with the washing liquid, under pressure, through a pipe (32). The downstream end (34) of the pipe is connected to the supply inlet (40) of the chamber. The chamber is fitted with at least one outlet orifice (30), for the projection of the liquid. A non return valve (38) is fitted between the downstream end of the supply pipe and the chamber.

Description

The present invention relates to a device for projecting

  washing liquid on a motor vehicle window.

  The invention relates more particularly to such a washing liquid spraying device intended to be carried by a windscreen wiper and of the type comprising a housing in which is fitted a chamber which is supplied with washing liquid under pressure by a pipe of feed whose downstream end is connected to a feed inlet of the chamber, the latter comprising at least one outlet orifice for the projection of the liquid, for example through

  a glass spray nozzle to wipe.

  The object of the invention is to improve the functioning of such a device so that it is as efficient as possible as soon as the driver of the vehicle actuates the means for controlling the watering of the windows and this by avoiding in particular that the room of the

  device does not empty unexpectedly between two consecutive sprays.

  To this end, the invention proposes a device of the type mentioned above, in which a non-return valve is interposed between

  the downstream end of the supply line and the chamber.

  According to other characteristics of the invention: the supply inlet comprises a section of pipe forming a connection end piece which projects outside the housing and around which is mounted the downstream tubular end of the food; - the non-return valve comprises a rear radial collar, which is in axial abutment against a radial shoulder facing opposite formed at the free end of the connection end piece, and comprises a front valve body which s' extends axially inside the connection piece - the body of the non-return valve is made of elastically deformable material and is shaped like a duckbill with two flattened lips of free front end which are liable to spread apart. 'one of the other, under the action of the pressurized washing liquid; the rear radial collar and the valve body are made by molding in one piece from a flexible material, in particular

elastomeric material.

  According to another aspect of the invention, and in order to allow the arrangement of a heating wire preventing frost, the non-return valve is

  crossed axially and sealingly by at least one heating wire.

  According to other characteristics of the invention - the heating wire extends axially between the two lips of the valve body between which it is tightly sealed when the two lips cooperate for the closing of the non-return valve; - The heating wire leaks through a hole formed in the body of the non-return valve;

  - the outlet is fitted with a spray nozzle.

  The invention also relates to a motor vehicle windscreen wiper carrying a projection device in accordance with

lessons indicated above.

  Other characteristics and advantages of the invention

  will appear on reading the detailed description which follows, for the

  understanding of which reference will be made to the appended drawings in which: - Figure 1 is a schematic exploded perspective view which illustrates the main components of a liquid spraying device produced in accordance with the teachings of the invention; - Figure 2 is a partial sectional view along the plane 2-2 of Figure 1; - Figure 3 is a perspective view on a larger scale of the non-return valve fitted to the device illustrated in Figures 1 and 2; - Figure 4 is an axial sectional view of an alternative embodiment of the non-return valve illustrated in Figures 1 to 3; - Figure 5 is a sectional view along line 5-5 of Figure 4; - Figure 6 is a view similar to that of Figure 3 which illustrates another alternative embodiment of the non-return valve; - Figure 7 is a schematic perspective view which illustrates yet another alternative embodiment of the non-return valve; - Figure 8 is a schematic perspective view which illustrates a last variant of the non-return valve; and - Figures 9 and 10 are sectional views along the lines

9-9 and 10-10 of figure 8.

  In the following description, identical components,

  similar or analogous are designated by the same reference numbers. FIG. 1 shows a spray device 20 which essentially consists of a body 22, which is a molded plastic part which is extended by an upper part 24 allowing, in the example illustrated diagrammatically on this figure, its attachment to a component 26 of a wiper, which is by

  example a flattened rod forming the body of the wiper arm.

  The body 22 of the spraying device 20 is essentially hollow and it delimits an internal spraying chamber 28 which comprises at least one outlet orifice equipped, in this example, with a nozzle

  spray 30 (see Figures 1 and 2).

  The chamber 28 is supplied with pressurized washing liquid by a pressurized liquid supply pipe 32 which is a pipe made of flexible material, for example of elastomeric material, of which a downstream end section 34 is shown.

Figures 1 and 2.

  According to a known design, the section 34 is designed to be fitted externally around a connection end piece 36 which is a section of pipe produced integrally with the body 22 which forms

  protrusion outside the chamber 28.

  According to a known design, the downstream end section 34 of the supply line 32 is fitted onto the end piece 36 by

  elastic deformation of the material constituting the pipe 32.

  In accordance with the teachings of the invention, a non-return valve 38 is arranged between the supply line 32 and the

spray chamber 28.

  More specifically, in the examples illustrated in the figures, the non-return valve 38 is interposed between the downstream end 34 of the supply pipe 32 and the inlet port 40 of the chamber

  sprinkler 28 defined by the connecting piece 36.

  The non-return valve 38 essentially consists of a front valve body 42 and a rear radial flange 44, these two parts of non-return valve 38 being produced, in this example,

  fabricated by elastomer molding in one piece.

  The radial collar 44 is an external collar whose diameter corresponds to the external diameter of the connection end piece 36 and the front radial face 46 of which is provided, in the first embodiment illustrated in FIGS. 1 to 3, to bear axially against the annular rear end face 48 of the end piece

  connection 36 and define the relative axial position of the check valve

  return 38 relative to the end piece 36, the valve body 42 extending

  axially forward inside the tubular inlet 40.

  As can be seen in FIG. 2, when the end 34 of the supply line 32 is mounted on the connection end piece 36, it also ensures the fixing and the axial maintenance of the non-return valve 38 in position in the end piece 36, the deformed internal wall of the downstream end 34 cooperating for this purpose by friction with the

  external cylindrical wall of the radial collar 44.

  The valve body 42 is shaped like a duckbill, that is to say

  say that it consists essentially of two flattened and opposite lips 50 of free front end which are separated from each other by an outlet slot 52 and which are normally in mutual contact so as to ensure closure of the slot 52 , the latter communicating between the two lips 50 with a rear opening or opening 54 which is open in the rear transverse face 56 of the radial collar 44 to allow the liquid under pressure to pass through the valve

  non-return valve 38 in the direction of supply of the spray chamber 28.

  When liquid under pressure enters the opening 54, it causes the transverse spacing of the two lips 50 to penetrate into the spray chamber 28, the slot 52 being thus temporarily opened by elastic deformation of the lips 50 and then closing so waterproof as soon as the liquid supply ceases

under pressure.

  According to one aspect of the invention, the spraying device comprises a heating wire 49, to cause the defrosting of the

  frost protection device which passes through the non-return valve 38.

  In the first embodiment illustrated in FIGS. 1 to 3, the heating wire 49 extends inside the valve 38 by penetrating through the opening 54 and then extending through the slot 52, the two lips

  Marrying it tightly when the slot 52 is closed.

  In order to ensure good guidance of the heating wire 49 in the spraying chamber 28, the non-return valve 38 has at its free end before a guide tube 62 which is produced, in this example, made of material by molding with one of the two lips 50, and which extends axially forwards in the direction of the chamber

sprinkler 28.

  We will now describe the first variant

illustrated in Figures 4 and 5.

  In this variant, the two sealing lips 50 of the valve body 42 in duckbill are surrounded by a tubular sleeve 66 for centering the non-return valve 38 in the connection piece 36, the rear radial collar 44 being of stepped structure as can be seen in Figure 5, to be received in a complementary stepped bore

of the connection piece 36.

  There is no provision for a heating wire guide tube 62, a single hole 68 being provided in the slot 52 between the two lips 50. The embodiment of FIG. 6 will now be described in which the non-return valve 38 is generally of a conception

  identical to that illustrated in FIGS. 1 to 3.

  However, the heating wire does not, in this variant, pass through the valve body 42 itself, that is to say between the lips, but it passes in leaktight manner through a hole opening axially

  formed through the solid part of the rear external radial collar 44.

  In the alternative embodiment illustrated in FIG. 7, the valve body 42 is generally cylindrical in shape with the lips 50 of rounded profile formed at its free front end, and it is reinforced by two ribs of vertical radial orientation 72, the l one has a

  hole 70 for the passage of the heating wire.

  In the alternative embodiment illustrated in FIGS. 8 to 10, if it is compared with the embodiment in FIG. 7, the base 41 of the valve body 42 is of generally frustoconical shape and there are two extensions 74 extending axially towards the front which ensures centering of the valve body 42 inside the connection end piece

  and one of which is traversed by a hole 70 for the passage of the heating wire.

  In all of the embodiments and variants which have just been described, the non-return valve 38 is a particularly economical part produced by molding and the assembly of which is extremely simple since it is carried out automatically upon connection of the

supply line 32.

  In addition, each valve 38 may include means for allowing the passage of a heating wire which is also held axially or longitudinally in position relative to the device, that is to say of which it is certain that it is then , by friction, maintained with

  its free front end inside the spray chamber 28.

Claims (10)

  1. Device (20) for spraying washing liquid onto a window of a motor vehicle of the type comprising a housing (22) in which is fitted a chamber (28) which is supplied with washing liquid under pressure by a pipe (32) the downstream end (34) of which is connected to an inlet (40) for supplying the chamber (28), the latter comprising at least one outlet orifice (30) for projecting the liquid, characterized in that a non-return valve (38) is interposed between the downstream end (34) of the supply line (32) and the room (28).   2. Device according to the preceding claim, characterized in that the supply inlet (40) comprises a section of pipe forming a connection piece (36) which projects outside the housing (22) and around which is mounted the downstream tubular end (34)   of the supply line (32).   3. Device according to the preceding claim, characterized in that the non-return valve (38) comprises a rear radial collar (44), which is in axial abutment against a radial shoulder facing (48) formed at the free end of the connection end piece (36), and comprises a front valve body (42) which extends axially inside (40) of the connection end piece (36).   4. Device according to the preceding claim, characterized in that the body (42) of the non-return valve is made of elastically deformable material and is shaped like a duckbill with two flattened lips (50) of free front end, which are likely to move apart from each other under the action of the pressure washing liquid.   5. Device according to any one of claims 3 or 4,   characterized in that the rear radial collar (44) and the valve body (42) are made by molding in one piece from a material   flexible, especially made of elastomeric material.   6. Device according to any one of claims   previous, characterized in that the non-return valve (38) is crossed   axially and tightly by at least one heating wire (49).   7. Device according to the preceding claim taken into account   combination with one of claims 4 or 5, characterized in that   the heating wire (49) extends axially between the two lips (50) of the valve body (42) between which it is tightly sealed when the two lips cooperate to close the non-return valve (38). 8. Device according to claim 6, characterized in that the heating wire (49) sealingly passes through a hole (70) formed in the non-return valve (38).   9. Device according to any one of claims   previous, characterized in that the outlet (30) is provided with a spray nozzle.   10. Wiper (26) of a motor vehicle, characterized in that it carries a projection device (20) according to any one of previous claims.