Washing arrangement for a windscreen wiper

Abstract: A washer arrangement is provided for a windscreen wiper which comprises a wind screen wiper blade (not shown), a windscreen wiper arm (10) for driving the windscreen wiper blade and a connector element (1) for connecting the windscreen wiper arm (10) to the windscreen wiper blade. The arrangement comprises a connector element (1) carrying one or more washing nozzles (17, 18).

Description: This invention relates to a washer arrangement for a windscreen wiper for vehicles. Many different methods have been used in conjunction with windscreen wipers for washing windscreens and so improve visibility. Basically there are two main types: 1. Stationary jets - in which jets of washing fluid are directed onto the screen from nozzles located in various areas of the vehicle body work. 2. Traveling jets - in which nozzles are carried by the wiper itself and travel across the screen therewith. These nozzles direct washing fluid onto the windscreen, usually in advance of the wiping element or rubber of the wiper blade. It is with this latter type of system that the present invention is concerned. In the past, nozzles have been carried either by the windscreen wiper blade or by the windscreen wiper arm. In the former case, there is the disadvantage that in order to replace the blade, various hoses of the washer system need to be disconnected before detachment and reconnected after replacement of the blade. Furthermore, specialised blades are necessary which significantly increases the cost of the installation. In these respects, positioning of the nozzles on the arm itself is a distinct advantage, but such arrangements suffer from other disadvantages not present with blade mountings. For example, the relative positions of arms and blades is such that in many cases it is difficult, if not impossible, to position the nozzles so that they spray the washing fluid adequately in front of the blade. This situation is aggravated by the modern tendency to have a very low profile of the wiping system so that in many applications, the arm lies alongside but behind the blade. One prior proposal has been disclosed in DE-A-3 545 754. This has dual arm construction, particularly for use with double blade arrangements. In this arrangement, the arms are hollow, allowing for the passage of cleaning fluid which passes to a connector arrangement which is arranged to detachably engage a wiper blade or a support for a plurality of blades. This connector carries a number of nozzles for supply of cleaning fluid to the blade area. However, this construction is of a complex nature and cannot use the standard forms of arm, mating the arrangement expensive to manufacture. Furthermore, because the washer nozzles are located on that part of the connector actually making engagement with the blade or blade support, it is difficult to ensure that the cleaning fluid is directed to the most appropriate parts of the windscreen, particularly where a single blade is used. The present invention seeks to reduce or substantially obviate some or all of these disadvantages. According to the present invention, this object is achieved by the washer arrangement as defined in independent claim 1. Embodiments of the invention are disclosed in the dependent claims. It is to be understood that the term "connector element" used throughout this specification is intended to cover not only arrangements in which the connector is detachable from both the arm and the blade but also those in which it is permanently attached to the arm so as to provide a termination therefore. The invention will now be described in greater detail, by way of example, with reference to the drawings, in which:- Figure 1 is a perspective view from above of one form of connector element in accordance with the invention; Figure 2 is a perspective view from below of the connector element of figure 1; Figure 3 is a sectional view of the connector element taken on the line III - III of figure 1, and Figure 4 is an end view of the connector element taken in the direction of the arrow IV of figure 1. Basically, the connector 1 shown is of the form described and shown in figure 10 of our prior Patent Application EP 87 300 804.9 (published under no. EP-A-0 231 129). It is intended to cooperate with an aperture formed in the primary yoke of a windscreen wiper blade harness (not shown) and to this end has a central block portion 2 adapted to sit within this aperture. A fixed projecting lip 4 is provided at one end and a movable projecting lip 5 is provided on a resilient tongue 6 at the other end. The block portion 2 is provided with a head portion 7 which prevents the block portion 2 of the connector element 1 passing right through the aperture in the primary yoke. The connector element is provided with a tubular part 8 of rectangular cross-section for receiving the end of a windscreen wiper arm 10 and this tubular part 8 is connected to the head portion 7 by means of a connecting portion 11 which extends at right angles both to the head portion 7 and the tubular part 8. The interaction of the connector element 1 with the windscreen wiper blade itself is described in considerable detail in our previously mentioned prior Application (EP-A-0 231 129) and will not be discussed in detail here. Very briefly, the end of the block portion 2 carrying the resilient lip 5 is pushed into the yoke aperture and against one end thereof, flexing the tongue 6 and allowing the other end of the block portion 2 to enter the aperture. Once in place, the tongue 6 flexes back and the connector is retained pivotally in the aperture between the head portion 7 and the two lips 4 and 5. To provide for the travelling jets, the connector element 1 is formed with a nozzle head 15 which depends, on the outside of the blade, from an extension 16 of the head portion 7. The head 15 is equipped, in the embodiment shown with three nozzles 17, 18 and 19 of which the nozzle 17 points forwards, the nozzle 18 points downwards and the nozzle 19 points backwards. An extension 20 is situated beneath the tubular part 8 and contains a hose connecting bore 21 (figure 3) to which a hose 22 is connected. Because of this position of the hose connection, the hose can be carried on the underside of the wiper arm 10. The hose connection is connected around the extremity of the connector element 1 by a rib portion 23 which carries passages as can be seen in the sectional view of figure 3. As figure 3 shows, the hose connecting bore 21 is connected to an elongate passage 25 which extends through the rib portion 23 and into the nozzle head 15. Here its end is closed by the nozzle 18. One side bore 26 for the nozzle 19 can be seen, the other bore for the nozzle 17 not being visible. It will be appreciated that while the invention has been described in relation to one particular type of connector element, the invention could equally well be applied to other types of connector. Many modifications are possible without departing from the scope of the invention as claimed. For example, the number and positioning of the nozzles may be varied as desired. The position of the nozzle head could be varied.

Claims: A washer arrangement for a windscreen wiper which comprises a windscreen wiper blade having main and subsidiary yokes, a windscreen wiper arm (10) for driving the windscreen wiper blade and a connector element (1) for connecting the windscreen wiper arm (10) to the windscreen wiper blade, the connector element (1) having a first portion (2) which sits within an aperture in the main yoke, said connector element having a nozzle head (15) connected to said first portion (2) above the main yoke as part of a one-piece connector element (1), the nozzle head (15) depending along one side of the main yoke and leading down from a rib portion (23) which connects the nozzle head to said first portion (2), and an extension (20) depending along the other side of the main yoke from the rib portion (23) and in line with a part (8) of the connector element for receiving the wiper arm (10), the part (8) also extending along the other side of the main yoke, a hose extending along the underside of the wiper arm (10) and leading to a bore (21) in the extension (20) which connects to a passage (25) passing through the rib portion (23) and into one or more bores (26) in the nozzle head (15) for delivery of washing liquid to one or more washing nozzles (17,18,19) carried by the nozzle head (15). A washer arrangement as claimed in Claim 1, characterised in that the nozzle head (15) on the connector element carries a plurality of nozzles (17,18,19) pointing in different directions. A washer arrangement as claimed in claim 2, characterised in that wherein the connector element (1) includes a central block portion (2) adapted to sit within an aperture formed in the primary yoke of the windscreen wiper blade and which carries the nozzle head (15), first attachment means (8) for attaching the connector element (1) to a windscreen wiper arm (10) and second attachment means (4, 5, 6) for attaching the block portion (2) with sufficient play in the said aperture to allow pivotal movement between the block portion (2) and the windscreen wiper blade, the second attachment means (4, 5, 6) being provided with spring retention means (5, 6) movable between a first stable position in which it retains the block portion (2) in the windscreen wiper blade and a second, unstable position in which the central block portion (2) can be assembled on the windscreen wiper blade. A washer arrangement as claimed in claim 3, characterised in that the block portion (2) has a head portion (7) which prevents the block portion (2) from passing right through the said aperture and the first attachment means comprises a tubular part (8) of rectangular cross section for receiving the end of the windscreen wiper arm (10), this tubular part (8) being connected to the head portion (7) by a connecting portion (11) which extends at right angles both to the head portion (7) and the tubular part (8). A washer arrangement as claimed in claim 4, characterised in that the nozzle head (15) depends downwardly in the intended direction of the windscreen from an extension of the head portion (7). A washer arrangement as claimed in claim 5, characterised in that the nozzle head (15) is provided with three nozzles (17, 18, 19) pointing in three directions, one direction being such as to deposit a first jet of washer fluid downwardly onto the windscreen and the other two directions being such as to deposit jets of washer fluid on to the windscreen to opposite sides of the first jet.

Inventors: FRIMLEY CHARLES HENRY, FRIMLEY, CHARLES HENRY
Applicants: TRICO LTD, TRICO LIMITED
Application year: 1989
Main classification: B60S1
IPC codes: B60S1