Automotive cleaning fluid sprayer

Abstract: An automotive cleaning fluid sprayer (1) wherein a body (2) has an inner conduit (7) for the passage of a cleaning fluid and an outlet hole (15) communicating with the conduit. According to the invention, the conduit (7) has at least one cylindrical dead end portion (10) defined by a cylindrical lateral wall (12) and terminating with an end wall (13); and the hole (15) is defined by a circumferential slit formed through the lateral wall (12) at a small predetermined distance from the end wall (13). Unlike known solutions, the sprayer ensures complete atomization of the cleaning fluid with no need for a separate specially designed nozzle fitted to the sprayer body.

Description: The present invention relates to an automotive cleaning fluid sprayer. To clean automotive glass surfaces, e.g. a vehicle windscreen, fluid-dynamic sprayers are used to direct a jet of cleaning fluid, supplied under pressure from a cleaning fluid circuit, on to the surface in the form of a spray. Atomization (dispersion of the fluid in the form of fine drops) is essential to cover as large a surface area as possible and ensure thorough cleaning, and is normally achieved by virtue of the geometrical design of the inside of the spray nozzle and/or of the nozzle feed channel. One known nozzle, for example, has an inner chamber with a small outlet hole, and a central channel is formed inside, separate from the walls of the chamber, so that the cleaning fluid is divided into separate streams which are broken up on collision with one another at the outlet hole to form a spray. Another known so-called "flute" solution employs a nozzle having a hollow cylindrical vertical seat. At the top of the seat, an outlet slit for the cleaning fluid jet is formed adjacent to the end wall closing the seat, and, just below the slit, a contoured projection extends radially inwards from the lateral wall of the seat to atomize the cleaning fluid before it is expelled through the slit. Another known solution employs a nozzle which is substantially horizontal with respect to the cleaning fluid feed conduit, and which has a cylindrical inner seat terminating with a spherical end wall on to which opens a small rectangular outlet hole. By virtue of the spherical shape of the wall, the fluid is broken up into different flow components which are atomized on collision. All the above known solutions have the major drawback of involving at least two separate component parts: a sprayer body which can be fitted in an appropriate position on the vehicle body, and in which the cleaning fluid feed conduit is formed; and a nozzle fitted to the sprayer body and designed to achieve a given atomizing effect. Sprayers of this type therefore pose the problem of ensuring the nozzle is fitted correctly to the sprayer body - any error in assembly possibly resulting in impaired operation - and are also fairly expensive and complicated to produce and assemble, precisely on account of comprising (at least) two parts. US-A-3 082 961 discloses the preamble of claim 1. It is an object of the present invention to provide a sprayer which, besides being highly effective, particularly as regards atomization of the cleaning fluid, is also cheap and easy to produce and assemble. According to the present invention, there is provided an automotive cleaning fluid sprayer as defined in claim 1. The sprayer according to the invention is fully effective, particularly in ensuring complete atomization of the cleaning fluid, and, unlike known solutions, does not involve producing and assembling two separate component parts. The particular structure of the sprayer according to the invention, in fact, though extremely easy produce geometrically speaking, has surprisingly been found to ensure complete atomization of the cleaning fluid with no need for a separate specially designed nozzle. An embodiment of the present invention will be described by way of example with reference to the accompanying drawings, in which: Figure 1 shows a schematic longitudinal section of an automotive cleaning fluid sprayer in accordance with the invention; Figure 2 shows a cross section, not to scale, of the Figure 1 sprayer. With reference to the accompanying drawings, an automotive cleaning fluid sprayer 1, in particular for a vehicle windscreen, comprises a one-piece body 2 made of polymer material. Body 2 comprises a stem 3 and a head 4 located at a first longitudinal end 5 of stem 3 and substantially perpendicular to stem 3, can be fitted, in known manner not described for the sake of simplicity, to a vehicle body (not shown), and is connectable, also in known manner, to a cleaning fluid feed circuit (not shown), e.g. by a second longitudinal end 6 of stem 3, opposite first longitudinal end 5. Stem 3 has an inner conduit 7 for the passage of cleaning fluid supplied under pressure from the feed circuit. Conduit 7 has an open end 8 for receiving the cleaning fluid, and which is located at second longitudinal end 6 of stem 3 and is connectable in series with the cleaning fluid feed circuit; and a closed end 9 opposite end 8 and located at first longitudinal end 5 of stem 3. More specifically, at end 9, conduit 7 comprises a substantially cylindrical dead end portion 10 having a substantially straight axis 11 and defined by a cylindrical lateral wall 12. End portion 10 of conduit 7 is closed at end 9 by an end wall 13 which has a substantially flat surface 14 facing conduit 7 and substantially perpendicular to lateral wall 12 and, hence, axis 11. In the embodiment shown, conduit 7 is entirely cylindrical with a straight axis 11. End portion 10 of conduit 7 has an outlet hole 15 through which the cleaning fluid is expelled from conduit 7, and which is formed through cylindrical lateral wall 12, at a small predetermined distance from end wall 13, and has a longitudinal axis 16 substantially perpendicular to axis 11. More specifically, hole 15 is defined by a rectangular circumferential slit formed through cylindrical lateral wall 12 and separated from end wall 13 by an annular portion 17 of lateral wall 12 of a small predetermined height comparable with the height of slit 15 itself. Slit 15 has two minor sides (defining the height of slit 15) parallel to axis 11; two curved major sides (arc-shaped and defining the angular extension of slit 15) perpendicular to axis 11; and a section diverging outwards of conduit 7 along axis 16 so as to define a substantially truncated-pyramid-shaped longitudinal section. In actual use, sprayer 1 is fitted to the vehicle body with stem 3 and conduit 7 substantially perpendicular to the vehicle body at the point of attachment; slit 15 is positioned facing the surface on to which the jet of cleaning fluid is to be directed (e.g. the vehicle windscreen) ; and conduit 7 is connected to the cleaning fluid feed circuit. When a jet of cleaning fluid is fed along conduit 7, the specific geometry of sprayer 1 (in particular, slit 15 formed through cylindrical lateral wall 12, at a small distance from end wall 13) divides the jet into separate streams. More specifically, the jet is divided into a central stream flowing along axis 11, and two lateral streams flowing along lateral wall 12, on diametrically opposite sides of slit 15, as shown schematically in Figure 2. All three streams are expelled simultaneously through slit 15 and, once through slit 15, are broken up and atomized on collision with one another.

Claims: An automotive cleaning fluid sprayer (1) comprising a body (2) having an inner conduit (7) for the passage of a cleaning fluid and an outlet hole (15) communicating with said conduit; wherein said conduit (7) comprises at least one cylindrical dead end portion (10) having a substantially straight axis (11), defined by a cylindrical lateral wall (12) and terminating with an end wall (13); and wherein said hole (15) is defined by a circumferential slit formed through said lateral wall (12) at a small predetermined distance from said end wall (13); said small predetermined distance being comparable with the height of the slit (15); characterized in that, in combination (i)- said body (2) is a one-piece body made of polymer material and comprises a stem (3) having said inner conduit (7), the conduit (7) having an open end (8) for receiving the cleaning fluid which is located at a longitudinal end (6) of said stem (3) and is connectable in series with the cleaning fluid feed circuit; (ii)- said conduit (7) is entirely cylindrical and its open end (8) has the same straight axis (11) as the cylindrical dead end portion (10); (iii)- so as that a jet of cleaning fluid fed along said conduit (7) is divided into separate streams, specifically into a central stream flowing along said straight axis (11) of said conduit (7), and two lateral streams flowing along said lateral wall (12), on diametrically opposite sides of said slit (15); all said three streams being expelled simultaneously through said slit (15) and, once through said slit (15), being broken up and atomized on collision with one another. A sprayer as claimed in Claim 1, characterized in that said end wall (13) has a substantially flat surface (14) facing said end portion (10) and substantially perpendicular to said lateral wall (12). A sprayer as claimed in one of the foregoing Claims, characterized in that said slit (15) is a rectangular slit. A sprayer as claimed in one of the foregoing Claims, characterized in that said slit (15) has a section diverging outwards from said conduit (7). A sprayer as claimed in one of the foregoing Claims, characterized in that said body (2) further comprises a head (4), perpendicular to said stem(3).

Inventors: CAU PIETRO, YON FULVIO, CAU, PIETRO, YON, FULVIO
Applicants: ITW AUTOMOTIVE ITALIA S R L, ITW AUTOMOTIVE ITALIA S.R.L.
Application year: 2001
Main classification: B60S1
IPC codes: B60S1