Cleaning arrangement for a wiper arm of a windscreen wiper system, wiper arm and windscreen wiper system

Abstract

The invention relates to a cleaning arrangement (10; 10a) for a wiper arm (1) of a windscreen wiper system (100), wherein the cleaning arrangement (10; 10a) has at least one spray nozzle (21, 22) for a cleaning fluid, wherein the cleaning arrangement (10; 10a) is constructed to form en engagement connection (30) at the wiper arm (1), and wherein the engagement connection (30) comprises at the cleaning arrangement (10; 10a) at least one resiliently constructed engagement element (40; 40a) which is constructed to cooperate with an engagement mount (54; 54a) at the wiper arm (1). There is provision according to the invention for the cleaning arrangement (10; 10a) to have first guide means (35), which first guide means (35) are constructed to be able to rotate the cleaning arrangement (10; 10a) in a rotation axis (37) in order to establish the engagement connection (30).

Claims

1. A cleaning arrangement for a wiper arm of a windscreen wiper system, comprising: a plurality of spray nozzles for a cleaning fluid, the plurality of spray nozzles having spray openings formed on an obliquely arranged surface of the cleaning arrangement; and a supply connecting piece extending into the wiper arm to supply the cleaning arrangement with the cleaning fluid, wherein the cleaning arrangement is constructed to form an engagement connection at the wiper arm, and wherein at the cleaning arrangement, the engagement connection comprises at least one resilient engagement element which is constructed to cooperate with an engagement mount at the wiper arm, wherein a first guide means is constructed to establish the engagement connection by rotating the cleaning arrangement with respect to a rotation axis, and wherein the obliquely arranged surface of the cleaning arrangement is obliquely arranged from a wall of the cleaning arrangement on which the first guide means is arranged.

2. The cleaning arrangement according to claim 1, wherein the first guide means is constructed as at least one separate element from the at least one engagement element.

3. The cleaning arrangement according to claim 2, wherein the first guide means comprises at least one extension to be insertable into a mount opening of the wiper arm.

4. The cleaning arrangement according to claim 3, wherein at least two extensions are provided which are arranged on a common circle diameter around the rotation axis at equal angular distances relative to each other.

5. The cleaning arrangement according to claim 3, wherein the at least one extension comprises a head portion with an increased cross-section, which head portion is constructed to engage behind a wall of the wiper arm.

6. The cleaning arrangement according to claim 1, wherein the cleaning arrangement is constructed as an injection moulded part comprising a plastics material, and the engagement element is formed as an engagement projection in one piece on the cleaning arrangement.

7. A cleaning arrangement for a wiper arm of a windscreen wiper system, comprising: a plurality of spray nozzles for a cleaning fluid, the plurality of spray nozzles having spray openings formed on an obliquely arranged surface of the cleaning arrangement, wherein the cleaning arrangement is constructed to form an engagement connection at the wiper arm, and wherein at the cleaning arrangement, the engagement connection comprises at least one resilient engagement projection element which is constructed to cooperate with a recess acting as an engagement mount at the wiper arm; wherein a first guide means is constructed to establish the engagement connection by rotating the cleaning arrangement with respect to a rotation axis, wherein the obliquely arranged surface of the cleaning arrangement is obliquely arranged from a wall of the cleaning arrangement on which the first guide means is arranged; and wherein the engagement projection is constructed to move into the recess during rotation of the cleaning arrangement with respect to said rotation axis.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 is a perspective view of a windscreen wiper system,

(2) FIG. 2 is a side view of the wiper arm of the windscreen wiper system according to FIG. 1 in the region of the cleaning arrangement,

(3) FIG. 3 is a cross-section through the wiper arm in the plane III-III of FIG. 2,

(4) FIG. 4 is a longitudinal section through the wiper arm of FIG. 2 in the plane IV-IV of FIG. 2,

(5) FIG. 5 is a section in the plane V-V of FIG. 3,

(6) FIGS. 6 to

(7) FIG. 8 are partially sectioned, perspective views of the assembly process of a first cleaning arrangement according to the invention in the region of the wiper arm and

(8) FIG. 9 and

(9) FIG. 10 are also partially sectioned, perspective views of a cleaning arrangement which is mounted on a wiper arm and which is constructed in an alternative manner with respect to FIGS. 6 to 8.

DETAILED DESCRIPTION

(10) Elements which are the same or which have the same function are indicated in the Figures with the same reference numerals.

(11) FIG. 1 shows a windscreen wiper system 100 for cleaning a vehicle windscreen which is not shown. The windscreen wiper system 100 has a wiper arm 1 which is arranged in a pivotable manner about an axis 101 and the end region of which facing away from the axis 101 is connected to a wiper blade 2 which is known per se. The wiper blade 2 has in particular a rubber wiper member 3 with a wiper lip which adjoins the vehicle windscreen. At the upper side facing away from the vehicle windscreen, the wipe blade 2 has, for example, a spoiler-like portion or cross-section.

(12) The wiper blade 2 extends along a longitudinal axis A and is arranged for movement about a pivot axis Y on the wiper arm 1 in order to be able to adapt in an optimum manner in particular to the curvature of the vehicle windscreen during movement along the vehicle windscreen. The front-side end regions of the wiper blade 2 are connected to an end piece 4.

(13) In order to fix the wiper blade 2 to the wiper arm 1 in a replaceable manner, the wiper blade 2 has a wiper blade adapter 5 which is known per se and by means of which the wiper blade 2 can be introduced into a substantially U-shaped mount region 6 of the wiper arm 1 from the direction of the arrow 8 and can be withdrawn from the mount region 6 counter to the direction of the arrow 8 (FIG. 4). In order to secure or fix the wiper blade 2 in the mount region 6, the wiper arm 1 has at an upper side thereof a recess 9 which is, for example, rectangular in cross-section and in which an engagement element which is arranged on the wiper blade 5 and which is in the form of a push-button 11 projects in order to form an engagement connection between the wiper blade 2 and the wiper arm 1 (see FIG. 1).

(14) As can best be seen with reference to FIG. 3, the mount region 6 of the wiper arm 1 has two side was 13, 14 which project from the upper side 12 of the wiper arm 1 and which are arranged parallel with each other. Retention portions 15, 16 project inwards from the side walls 13, 14 at the side facing away from the upper side 12. The wiper blade 2 is received inside the mount region 6 constructed in this manner with the wiper blade adapter 5 in a fixed manner.

(15) A cleaning arrangement 10 according to the invention is arranged at one side wall 14 of the wiper arm 1 which is arranged at the side facing away from a wiper rod 17 of the wiper arm 1.

(16) The cleaning arrangement 10 at least substantially comprises plastics material and is constructed as an injection-moulded plastics component. The cleaning arrangement 10 has a substantially block-like or parallelepipedal member 18, from which a supply connecting piece 20 projects, over which the end of a hose line which is not shown may be fitted in order to supply the cleaning arrangement 10 with cleaning fluid.

(17) The hose line mentioned is in this instance guided in particular inside the cross-section of the wiper arm 1, wherein in accordance with the illustration of FIG. 4 the supply connecting piece 20 is arranged inside the mount region 6 with the cleaning arrangement 10 mounted on the wiper arm 1 and extends at an angle a relative to the side wall 14.

(18) A plurality of spray nozzles having spray openings 21, 22 are arranged or formed on the outer face of the member 12 and are supplied with the cleaning fluid via the supply connecting piece 20, Whereas, by way of example, four spray openings 21 which are arranged one above the other are formed on an obliquely arranged, front end face 23 of the member 18 in accordance with the illustration of FIG. 3, three spray openings 22 which are arranged one above the other are provided on a rear, similarly obliquely arranged end face 24. The spray streams of the cleaning agent or the spray openings 21, 22 are orientated relative to the wiper blade 2 so that cleaning fluid strikes the vehicle windscreen 1 in particular in the longitudinal direction or in the direction of the longitudinal axis A in front of the wiper blade 2, wherein the cleaning fluid is distributed as uniformly as possible over the longitudinal region of the wiper blade 2 or the vehicle windscreen as a result of corresponding angles of the spray nozzles 21, 22.

(19) The connection between the cleaning arrangement 10 or the member 18 and the wiper arm 1 is brought about by means of an engagement connection 30, The engagement connection 30 comprises, at a side face 31 of the member 18 facing the side wall 14 of the wiper blade 2, two extensions 32, 33 which project from the side face 31 at right angles and which together form first guiding means 35 for the cleaning arrangement 10. As can best be seen with reference to FIGS. 4 and 6 to 8, the extensions 32, 33 have at the side facing away from the side face 31 a head portion 36 which is increased in cross-section and which is formed to fix or secure, when the cleaning arrangement 10 is mounted on the wiper arm 1, the cleaning arrangement 10 to the wiper arm 1 in a direction extending in the direction of an axis 37 (FIGS. 4 and 5). This is brought about in that the head portions 36 of the extensions 32, 33 engage behind the side wall 14 of the wiper arm 1 or adjoin the inner side of the side wall 14 in a positive-locking manner, The axis 37 extends perpendicularly to the side wall 14 of the wiper arm 1 and the side face 31 of the cleaning arrangement 10.

(20) The extensions 32, 33 are arranged on a circle diameter 38 around the axis 37, preferably at identical angular spacings relative to each other. In the embodiment illustrated, the two extensions 32, 33 are consequently arranged to be offset relative to each other by 180 (FIG. 5).

(21) Furthermore, a resilient engagement element 40 is integrally formed on the member 18 of the cleaning arrangement 10. The engagement element 40 has, as can best be seen with reference to FIGS. 3 and 6, an engagement tongue 41, on an end region of which an engagement projection 42 is formed. The engagement tongue 41 extends substantially perpendicularly to a underside 43 of the member 18 and the engagement projection 42 projects beyond the side face 31 of the member 18, similarly to the extensions 32, 33, and terminates substantially flush with the underside 43.

(22) The side wall 14 of the wiper arm 1 has for each of the two extensions 32, 33 in accordance with the illustration of FIGS. 5 and 6 a mount opening 46, 47 in the form of an aperture (FIG. 5). The two mount openings 46, 47 are also arranged or formed so as to be offset through 180 relative to each other in the region of the circle diameter 38. Each of the two mount openings 46, 47 has a mount portion 48 which is formed so as to be increased in cross-section and which a guide portion 49 adjoins. While the cross-section of the mount portion 48 is at least as large as the cross-section of the head portion 36 of the extensions 32, 33, that is to say, is suitable for guiding the head portion 36 through the assembly portion 48, the cross-section of the guide portion 49 is adapted to the cross-section of the extensions 32, 33 in the region of an intermediate portion 50 of the extensions 32, 33 which connects the extensions 32, 33 to the side face 31 of the member 18.

(23) The assembly portions 48 form together with the guide portions 49 a circular-arc-segment-like guide path 51 for the extensions 32, 33, Furthermore, the mount openings 46, 47 form second guide means 52 which form the engagement connection 30 together with the first guide means 35 or the extensions 32, 33.

(24) Furthermore, the wiper arm 1 has in the region of the first retention portion 16 a recess 53 which acts as an engagement mount 54 for the engagement projection 42 of the engagement element 40 of the cleaning arrangement 10. As can best be seen with reference to FIG. 5, the recess 53 has a front stop edge 55 and an upper stop edge 56 which act as a stop during engagement of the engagement projection 42 or which prevent additional movement of the engagement projection 42 or the cleaning arrangement 10.

(25) The above explanations show that in the cleaning arrangement 10 the elements for forming the engagement connection 30 comprise, on the one hand, the two extensions 32, 33 which form the first guide means 53 and, on the other hand, the engagement element 40. In particular, the first guide means 35 and the engagement element 40 are constructed as mutually separate elements. Similarly, the second guide means 52 and the engagement mount 54 are also constructed as mutually separate elements or recesses on the wiper arm 1.

(26) The assembly of the cleaning arrangement 10 on the wiper arm 1 is explained below with reference to FIGS. 6 to 8 as follows. First, the cleaning arrangement 10 is orientated in accordance with FIG. 6 relative to the wiper arm 1 so that the extensions 32, 33 are aligned with the assembly portions 48 of the mount opening 46, 47. Subsequently, the cleaning arrangement 10 is moved in accordance with the direction of the arrow 57 against the side wall 14 of the wiper arm 1. In this instance, the extensions 32, 33 extend through the assembly portions 48 of the mount openings 46, 47 until the side face 31 of the member 18 of the cleaning arrangement 10 abuts the side wall 14 of the wiper arm 1, That state is illustrated in FIG. 7. Subsequently, the cleaning arrangement 10 is rotated about the axis 37 in accordance with the direction of the arrow 58. In this instance, the head portions 36 of the extensions 32, 33 move into operative connection with the inner side of the side wall 14 and therefore prevent the cleaning arrangement 10 from being able to be moved away from the wiper arm 1 (counter to the direction of the arrow 57). At the same time, the initially resiliently depressed engagement projection 42 of the engagement element 40 moves into the region of the recess 53 on the wiper arm 1 during additional rotation of the cleaning arrangement 10 about the axis 37. As soon as the cleaning arrangement 10 has reached its desired position or desired angular position on the wiper arm 1, which is ensured by a corresponding length of the guide paths 49, the engagement projection 42 of the engagement element 40 also engages with the engagement mount 54 on the wiper arm 1. Additional movement of the cleaning arrangement 10 on the wiper arm 1 in both rotation directions is an thereby prevented. That installation state is illustrated in FIG. 8.

(27) In order to release the engagement connection 30 or to disassemble the cleaning arrangement 10, it is necessary to press in the engagement dement 40 in the region of the engagement projection 42 in the direction towards the member 18, which may be achieved by a corresponding recess 59 on the member 18, in which the engagement element 40 is arranged.

(28) FIGS. 9 and 10 illustrate a modified cleaning arrangement 10a. The cleaning arrangement 10a differs from the cleaning arrangement 10 in that the engagement element 40a is connected to an engagement tongue 41a via a connection portion 61 which is arranged in the region of the underside 43 of the member 18a. The engagement projection 42a arranged on the engagement tongue 41a terminates in a substantially central region of the member 18a near one extension 32. In particular, the engagement projection 42a has a cross-section surface-area which corresponds to the cross-section surface-area of the mount opening 46 in the region of the mount portion 48.

(29) The cleaning arrangement 10a is assembled on the wiper arm 1 in a manner similar to the cleaning arrangement 10. Unlike that arrangement, however, the engagement projection 42a is arranged in the region of the assembly portion 48 of the mount opening 46 in the end position of the cleaning arrangement 10a as can be seen in FIG. 10, that is to say that the assembly portion 48 forms the engagement mount 54a. Consequently, it is possible to dispense with a separate engagement mount 54 which is formed on the wiper arm 1.

(30) The windscreen wiper system 100 or the cleaning arrangement 10, 10a and the wiper arm 1 described above may be changed or modified in many manners without departing from the notion of the invention.

LIST OF REFERENCE NUMERALS

(31) 1 Wiper arm 2 Wiper blade 3 Rubber wiper member 4 End piece 5 Wiper blade adapter 6 Mount region 8 Arrow 9 Recess 10, 10a Cleaning arrangement 11 Push-button 12 Upper side 13 Side wall 14 Side wall 15 Retention portion 16 Retention portion 27 Wiper rod 18, 18a Member 20 Supply connecting piece 21 Spray opening 22 Spray opening 23 End face 24 End face 30 Engagement connection 31 Side face 32 Extension 33 Extension 35 Guide means 36 Head portion 37 Axis 38 Circle diameter 40, 40a Engagement element 41, 41e Engagement tongue, side face 42, 42a Engagement projection 43 Underside 46 Mount opening 47 Mount opening 48 Assembly portion 49 Guide portion 50 intermediate portion 51 Guide path 52 Guide means 53 Recess 54, 54a Engagement mount 55 Stop edge 56 Stop edge 57 Arrow 58 Arrow 59 Recess 61 Connection portion 100 Windscreen wiper system 101 Axis A Longitudinal axis Y Pivot axis Angle