FR2971985A1 - WIPER BLADE FOR CLEANING VEHICLE WINDOWS - Google Patents

Abstract

The invention relates to a wiper blade (10) for cleaning vehicle windows, comprising an elongated wiper blade body (15) for housing a wiper blade (16), the wiper blade body (15) having at least one spray channel (38, 39) for windscreen washer fluid, which on the one hand has a plurality of spray nozzles (40) and which is coupled with on the other hand with a dispensing element (32; 32a) through which windscreen fluid can be conveyed to the windscreen wiper body (15). According to the invention, the dispensing member (32; 32a) is provided with a check valve element (50) in the windscreen washer delivery zone (52) which closes the dispensing zone. transport (52) in a first position, and in that the distribution element (32; 32a) has at least one exhaust opening (40a, 53) through which the washer fluid escapes from the distribution element (32; 32a) in the first position of the check valve element (50).

Description

-1- Wiper blade for cleaning windows of vehicles

State of the Art The invention relates to a wiper blade for cleaning vehicle windows.

Such a wiper blade is known from DE 10 2008 020 227 of the Applicant. It is provided for the known windshield wiper blade that windshield washer fluid is fed to the windscreen wiper blade via flexible lines, which are connected by a distribution element-shaped coupling to channels. sprayers, which are themselves arranged on the longitudinal side of the wiper blade. Spray channels depart from the spray nozzles, which, when operating the wash mode, convey windshield washer fluid as close as possible to the wiper lip of the wiper blade. In order to avoid that in the event of cold temperatures or insufficient antifreeze in the windshield washer fluid it freezes inside the spray channels, which causes a malfunction, it is known from the cited document of heat the spray channels. For this purpose, elements, in particular heating wires are implemented longitudinally in the spray channels. The disadvantage of this is that a wiper blade thus obtained is relatively complex or expensive to design, and it is often difficult to heat sufficiently or simply to reach all the places by means of the heating device. spray channels. Furthermore, there are also wiper blades whose spray channels are not designed heating, the windshield wiper fluid being in the spray channels flowing through the spray nozzles in case of non-actuation of the washing mode. The areas of the wiper blade located at the connection of the spray channels to the windshield washer fluid connection line are critical in this regard, particularly in the element. of distribution, since the washer fluid can accumulate in these areas. BRT0919 Statement of the invention

From the state of the art presented, the invention proposes to improve a wiper blade for cleaning windows so that it requires a reduced effort to the construction compared to the state of the art. the technique, and can thus be produced in a particularly inexpensive manner, while simultaneously ensuring that the functionality in washing mode of the wiper blade is always guaranteed. This improvement is obtained in the case of a windscreen wiper blade for cleaning vehicle windows with a wiper blade comprising an elongated wiper blade body for housing a rubber wiper blade. ice-cream, the wiper blade body comprising at least one spray channel for windshield washer fluid, which on the one hand preferably has a plurality of spray nozzles and which is coupled on the other hand with a distribution element , through which the washer fluid can be conveyed to the wiper blade body, characterized in that the dispensing member has a non-return valve element in the windshield washer delivery zone, which closes the delivery zone in a first position, and in that the distribution element has at least one exhaust opening, through which the washer fluid escapes from the dispensing element in the first position of the element clape t non-return.

The invention is thus based on the idea of providing in the distribution element which is used for the conveyance of windshield washer fluid to the spray channels a non-return valve which closes the delivery zone in the direction of the spray zone. and that the dispensing member has at least one exhaust opening, through which the washing liquid can escape from the dispensing member in the closed position of the check valve. In other words this means that the dispensing element in the wiper blade is so designed that windshield washer fluid is in the spray channels only during the washing mode, and that outside of the washing mode, the washer fluid still in the spray channels or in the dispensing element escapes. This ensures that no washer fluid can freeze inside the wiper blade. It has indeed been found that the washer fluid is conveyed in a very short time from the dispensing element to the spray channels during the start of the washing mode, without this posing for example a safety risk for the driver . It is thus no longer necessary under the invention, in particular for example to heat the liquid inside the wiper blade, it is simply necessary to ensure that sprayable liquid washer fluid is available. at the inlet of the distribution element, that is to say in the tubular supply line to the wiper blade.

The wiper blade may advantageously also have one or more of the following features, taken alone or in combination. The at least one exhaust opening is closed by the check valve element in a second position, in which the conveying zone is released. The at least one exhaust opening and the conveying zone for the windshield washer fluid in the form of an exhaust manifold are arranged at least substantially aligned with each other. The non-return valve element is made at least at the level of the conveying zone in the form of an elasticized membrane. The dispensing element is made of at least two parts, and a distribution element yoke 20 positions and secures the non-return valve element to the assembly with a dispensing element base body. . The dispenser element yoke and the dispenser element base body have housings for the non-return valve element. The dispensing element yoke and the dispensing element base body are made of plastic and the two parts are connected by a snap connection. The at least one exhaust opening is hydraulically connected at least indirectly via a bridging channel with the at least one spray channel. The at least one exhaust opening is formed of at least one additional spray nozzle. The at least one additional spray nozzle is disposed at the dispensing member. The embodiment of the invention wherein in a second position in which the conveying zone is released, the at least one exhaust opening is closed by the non-return valve is particularly preferred. It is thus prevented that windshield washer fluid escapes through the at least one (unused) exhaust opening during the washing operation, thereby minimizing windshield washer fluid consumption during the washing operation. In order to require a minimum of components for the opening or closing of the exhaust opening, it is furthermore proposed that the at least one exhaust opening and the windscreen washer fluidization zone produced in the form of exhaust pipe are disposed relative to each other at least substantially aligned with each other. It is thus made possible by one and only one element (check valve) to release the conveying zone (exhaust manifold) for the washer fluid and at the same time to close the at least one exhaust opening in 20 the corresponding position, during a linear movement of the corresponding element.

A particularly reduced construction effort to obtain the non-return valve element is obtained when it is formed at least at the level of the delivery zone of an elastic formed membrane. Thus, no moving mechanical parts are required, so that a relatively small mounting and manufacturing effort with reliable operation in parallel is achieved.

In an advantageous and constructive embodiment of the invention, which allows a particularly simple mounting of the non-return valve element, it is proposed that the distribution element is formed of at least two parts. and a dispensing element yoke positions and secures the check valve element to the assembly with a dispenser element base body. Such multi-piece dispensing elements can be manufactured in a particularly inexpensive manner and are particularly easily mounted when made of plastic and interconnected by a snap connection.

In a further constructive embodiment of the invention, in which it is possible to omit the closure of the at least one exhaust opening by the non-return valve element, it is proposed that the at least one opening exhaust is formed by at least one additional spray nozzle. It is thus ensured during the washing operation that no washer fluid escapes which is used for cleaning the window of the vehicle.

It is then particularly favorably provided that the at least one additional spray nozzle is formed at the dispensing member. Therefore, this additional spray nozzle can, for the evacuation of the washing liquid in the absence of a washing operation, for example be somewhat widened in diameter to allow a faster or more secure flow of the totality windshield washer fluid out of the wiper blade.

Other advantages, features and particularities of the invention will emerge from the following description of examples of preferred embodiments as well as from the figure.

This shows in: Fig. 1 is a perspective view of a windscreen wiper blade according to the invention of a wiper blade 30 according to the invention connected to a windscreen wiper arm, BRT0919 2971985 -6- FIG. 2 the spare parts of the wiper blade according to Figure 1 exploded, Fig. 3 a wiper blade distribution member according to Figure 2 seen in longitudinal section in a first embodiment of the invention, and FIG. 4 a longitudinal sectional view of a dispensing element modified with respect to FIG. 3.

The same elements or elements with the same function are provided with the same reference numerals in the figures.

In Fig.l is shown a wiper device 100 for cleaning windows of motor vehicles. The wiper device 100 comprises a wiper blade 10 according to the invention, which is interchangeably attached to a wiper arm 1, the wiper arm 1 being hingedly connected via a wiper arm joint 2 to a bearing element 3. The bearing element 3 is for its part connected to a wiper drive not shown.

For attaching the wiper blade 10 to the wiper arm 1, the wiper arm 1 has a windscreen wiper arm adapter 11 disposed at the wiper arm 1. The windscreen wiper arm adapter 11 is connected to the windscreen wiper blade 10 by means of a windscreen wiper blade adapter 12 disposed on the windscreen wiper blade 10, particularly at the windscreen wiper blade 10. means of a snap connection.

The wiper blade 10 has an elongated wiper blade body 15 which cooperates formally with a wiper rubber blade 16 on the side facing the vehicle window. On both longitudinal sides of the wiper rubber blade 16 are arranged in recesses forming corresponding grooves spring rails 17, 18. It may optionally be provided to arrange a heating wire 19 of a heater 20 on the upper side of the spring rails 17, 18, which is for example glued therein. By means of the heating device 20, the windscreen wiper lip 16 can be heated in particular to remove ice or the like adhering to the windscreen wiper lip 16. 20 is electrically connected via a connection socket 21 (FIG 2) to the onboard circuit of the motor vehicle.

As can be recognized in particular from FIG. 2, the wiper blade side adapter 12 is essentially composed of a wiper arm side adapter member 23 and a wiper blade side adapter member 24. Both adapter elements 23, 24 are arranged inclined or hinged relative to one another on an axis of rotation 26. By the wiper blade 10 is thus applied windshield washer fluid on the window glass. motor vehicle to be cleaned during a particular washing operation initiated by the user. For this purpose the wiper arm 1 has, as can be seen in FIG. 1, in the illustrated example, two conveying lines 27, 28 for windshield washer fluid, which are supplied on the vehicle side with windshield washer fluid from a washer fluid reservoir via a discharge pump. The two conveying lines 27, 28 are connected to connection pipes 29, 30 of a distribution element 32. The distribution element 32, which also serves to receive the connection plug 21, is intended to its part connected to a bearing element 33. The distribution element 32, the bearing element 33 and a connecting element 34, all preferably made of plastic, together form the wiper arm adapter element 23.

As can be recognized in particular in FIG. 2, the windscreen wiper blade adapter element 24 has a total of four exhaust pipes 35 on respective opposite sides, for windshield wiper products supplied via the distribution element 32 and the element bearing 33 of the additional flexible lines 36, 3-T The exhaust pipes 35 are insertable into spray channels 38, 39 formed on the longitudinal sides of the wiper blade body 15, inside the body of the wiper blade 15, which preferably extends along at least almost the entire length of the wiper blade body 15. BRT0919 2971985 -8- For the coupling of the wiper body wiper 15 with the wiper blade side adapter element 24, the wiper blade body 15 is made divided perpendicular to its longitudinal extent. Holes (not shown) start from the spraying channels 38, 39 and open into the spraying nozzles 40, for example being arranged at regular intervals from each other on the longitudinal sides of the sweeper body. The windshield washer fluid is applied directly to the vehicle window by means of the spray nozzles 40.

In order to prevent, in particular, in the event of an antifreeze deficit in the windshield washer fluid, the windshield washer fluid freezes on its way from the windshield washer fluid reservoir to the spray nozzles 40, the wiper 100 or the broom 10 is formed specifically. As in particular shown in FIGS. 3 and 4, a heating wire 42, 43 in the form of a resistive wire is respectively disposed in the conveyor lines 27, 28, in the wiper arm 1, which by means of a coupling to the wiper arm 1, vehicle edge circuit ensures that the windshield washer fluid in the conveyance lines 27, 28 can not freeze. It is then preferentially provided for the son heating son 42, 43 to go up to the level of connection pipes 29, 30. The problematic washing liquid during the washing operation of the wiper device 100 is the one still at the inside of the wiper blade 10 and inside the dispensing element 32 at the end of the washing operation. The water in the mop body 15 can certainly flow at least partially through the spray nozzles, but the area between the wiper blade body 15, particularly the zone in the bearing element 33 and in the dispensing member 32 is, in the state of the art, neither heated nor designed so that the washing liquid inside is evacuated.

To overcome this lack, the invention presents according to a first embodiment according to FIG. 3 a check valve element 50. The check valve element 50 is in the exemplary embodiment shown in FIG. 3 respectively made in BRT0919 2971985 -9- membrane form, that is to say in particular made flexible, and is composed for example of rubber. In the locking position of the non-return valve element 50 shown in FIG. 3, which shows the check valve element 50 when no washing mode of the wiper device 100 is activated, the check valve element 50 closes with a central zone 51 the routing zone. washer fluid in the exhaust manifold-like distribution member 52 within the dispensing member 32. The dispensing member 32 has on the opposite side of the exhaust manifold 52 of the central zone 51 of the non-return valve element 50 a purge bore 53. The purge bore 53 serving as an exhaust opening 10 for the windshield washer fluid in the dispensing element 32 ( and the bearing element 33) and the exhaust pipe 52 are preferably arranged coaxially with a common axis 54. The purge bore 53 is connected by a bridging channel 55 to the exhaust manifold 35 of the dispensing element 32.

An embodiment is preferred in which the dispensing element 32 is composed in two parts. The dispensing member 32 is then composed of a dispensing element base body 57 and a lid-shaped dispensing element head 58, in which the purge piercing 53 is formed. The dispensing element base 57 and the dispensing element yoke 58 have on mutually facing sides a radially extending housing 59, 60 for the peripheral region 61 of the non-return valve element 50. The peripheral area 61 of the non-return valve element 50 is fixed, or held and axially sealed between the housings 59, 60 to the mounting of the distribution element yoke 58. For this purpose, the main body of the element The dispenser 58 and the dispenser head 58 have a snap connection 63 which allows the two elements mentioned in the assembly to snap together.

In the position of the non-return valve element 50 shown in FIG. 3, the washer fluid may exit or flow out via the delivery member 32, the connecting manifolds 35, the bridge channel 55 and the purge bore 53. During the BRT0919 2971985 -10 - Washing mode of the wiper device 100, pressurized washer fluid is fed into the dispensing element 32 via the connecting pipes 29, 30 in the dispensing element. Due to the pressure of the washer fluid, the check valve element 50 is elastically deformed, in particular at the central zone 51 of the medium, thus releasing the exhaust manifold, and at the same time by pressing of the check valve element 50 against the purge bore 53, sealing or sealing the latter to the outside. In this way, the washer fluid can arrive via the exhaust pipes 35 into the spray channels 38, 39 as well as into the spray nozzles 40. The modified dispensing element 32a shown in FIG. 4 has, unlike the distribution element 32, no purge bore 53 in the region of the distribution element yoke 58a. This is rather at the level of the exhaust pipes 35a, made in the form of an additional spray nozzle 40a. In this embodiment of the invention, washer fluid within the dispensing member 32a can reach the outside via the additional spray nozzle 40a.

The wiper blade 10 according to the invention heretofore described can be declined or modified in various ways without deviating from the concept of the invention. This consists in the provision of an additional device for the removal of windscreen washer fluid in the distribution element 32, 32a, so that in case of non-actuation of the washing device of the washing liquid, ice in the distribution element 32, 32a can not freeze. In particular, it is possible to provide, as an alternative to the 25 embodiments shown, the non-return valve element, for example by means of mechanical elements, in particular by means of a sealing ball and spring elements or equivalent cooperating with it. It is thus possible to equip the embodiment of the distribution element32 according to FIG. 3 with a spray nozzle 40a according to the dispensing element 32a according to FIG. 4. BRT0919 -11- List of references 1 wiper arm 2 wiper arm articulation 3 element bearing wiper blade 11 adapter side wiper arm 12 adapter side wiper blade -Wheel wiper blade body 10 16 blade wiper rubber 17 rail spring 18 rail spring 19 wire heating heater 15 21 connection socket 23 wiper arm element adapter element 24 element wiper blade adapter 26 axis of rotation 27 conveying line 20 28 conveying line 29 connection pipe 30 connecting pipe 32 distribution element 32a distribution element 33 bearing element 34 connecting element 35 tubing exhaust 36 flexible pipe 37 flexible pipe

BRT0919 -12- 38 Spray channel 39 Spray channel 40 Spray nozzle 40a Additional spray nozzle 42 43 50 51 52 53 54 Spindle 55 Bridging channel 57 Delivery element base 58 Feeder head yoke 15 58a dispensing element head 59 housing 60 housing 61 peripheral region 63 snap-in connection 100 100 wiper device heating wire heating wire element check valve central zone exhaust pipe purge bore BRT0919

Claims (10)

REVENDICATIONS1. A wiper blade (10) for cleaning vehicle windows, comprising an elongate wiper blade body (15) for housing a wiper rubber blade (16), the wiper arm windscreen wiper (15) having at least one spray channel (38, 39) for windshield washer fluid, which preferably has a plurality of spray nozzles (40) and is coupled with a second dispensing element (32; 32a), through which the washer fluid can be conveyed to the wiper blade body (15), characterized in that the dispensing element (32; 32a) comprises an element check valve (50) in the windscreen washer delivery zone (52), which closes the conveying zone (52) in a first position, and in that the dispensing element (32; 32a) ) has at least one exhaust opening (40a, 53), through which the washer fluid escapes from the dispensing element (32; 32a) in the first e position of the non-return valve element (50). Wiper blade according to Claim 1, characterized in that the at least one exhaust opening (53) is closed by the non-return valve element (50) in a second position, in which the zone routing (52) is released. Windscreen wiper blade according to Claim 2, characterized in that the at least one exhaust opening (53) and the conveying zone (52) for the windscreen washer fluid in the form of tubing. exhaust are BRT0919 2971985 -14- arranged at least substantially aligned with each other. Windscreen wiper blade according to one of Claims 1 to 3, characterized in that the non-return valve element (50) is formed at least at the level of the conveying zone (52) in the form of a diaphragm. made elastic. Windscreen wiper blade according to one of Claims 1 to 4, characterized in that the distribution element (32, 32a) is made of at least two parts and that a cylinder head is (58; 58a) positions and secures the check valve member (50) to assembly with a dispenser element base body (57). The wiper blade according to claim 5, characterized in that the distribution element yoke (58; 58a) and the distribution element base body (57) comprise housings (59, 60). ) for the non-return valve element (50). Windscreen wiper blade according to Claim 5 or 6, characterized in that the distribution element yoke (58; 58a) and the distribution element base body (57) are made of plastics material. and in that the two parts are connected by a snap connection (63). Wiper blade according to one of claims 2 to 7, characterized in that the at least one exhaust opening (53) is connected hydraulically at least indirectly via a bridge channel (55). with the at least one spray channel (38, 39). Windscreen wiper blade according to one of Claims 1 to 8, characterized in that the at least one exhaust opening (53) is formed by at least one additional spray nozzle (40a). A wiper blade according to claim 9, characterized in that the at least one additional spray nozzle (40a) is disposed at the dispensing member (32a). BRT0919