WO2000048876A1

WO2000048876A1 - Windscreen wiper for miscellaneous types of vehicles

Info

Publication number: WO2000048876A1
Application number: PCT/DE2000/000441
Authority: WO
Inventors: Richard BÄHR
Original assignee: BÄHR, Marcus
Priority date: 1999-02-20
Filing date: 2000-02-17
Publication date: 2000-08-24
Also published as: AU3801400A; DE29903123U1

Abstract

The invention relates to a windscreen wiper that is provided for miscellaneous types of vehicles. Said windscreen wiper has a wiper blade which performs circular, swinging or rectilinear oscillating movements. The windscreen wiper consists of a self-sprung inset (1) which has approximately the length of a conventional wiper blade rubber element (3). Said inset (1) adapts to the curvature of the screen during wiping. The windscreen wiper is further provided with a sheathing (2) that accommodates the inset (1). A wiper blade rubber element (3) is arranged on the sheathing (2) that consists of an elastomer or a material of the same kind. Said elastomer or material are mounted on the inset (1) by injection moulding or by a casting process in such a way that the inset (1) is fixedly imbedded in the sheathing (2).

Description

Windshield wipers for all types of vehicles

The invention relates to a windshield wiper for vehicles of all types with a circular, oscillating or linearly oscillating movement of the wiper blade. It is primarily intended for cars and trucks as well as buses; the invention is also applicable to vehicles of other types, for example helicopters, and also to rail vehicles and ships. Furthermore, they are also considered for their application on vehicle headlights.

The usual windshield wipers used in motor vehicles generally consist of a windshield wiper blade with the retracted wiper rubber and a windshield wiper arm which establishes the connection to a drive axle provided in the vehicle. So that the wiper rubber during each of the Adjusting the curvature of the windshield, the wiper blade is coupled to the wiper arm via one or more joints.

This construction can on the one hand with regard to their susceptibility to wind, on the other hand with regard to their susceptibility to other mechanical influences, for. B. Ice formation is not considered optimal.

The following publications are part of the prior art:

DE 40 35 336 AI, DE 91 04 461 Ul, DE 87 01 961 Ul, DE 23 44 876 AI, AU-B-75 1 72/81. These publications essentially relate to windshield wipers with a recess on one side in the longitudinal direction of the windshield wiper

Support frame, which is also referred to as the base body, in which spring rails may also be inserted. A body made of rubber or plastic is inserted into this support frame and merges into a wiper lip on its underside.

US 26 13 385 and US 37 17 900. Wipers according to these publications consist of a number of stacked leaf springs. This leaf spring assembly is either introduced into a hollow body made of resilient material with a predetermined longitudinal curvature, or else it is covered with a cover which is attached from one side and secured at its end. Hollow bodies or shells merge into the wiper blade on their underside.

FR 820 156. The windshield wiper according to this publication consists of a resilient insert and a rubber band which is embedded by a Metal band is armored. The rubber strap has one or more wiping lips on its underside.

US 34 80 986. According to this publication, a resilient arm that can be placed on the drive axle of the windshield wiper is provided with a sleeve pulled over the free end of the resilient arm, the latter carrying the wiper lip on its underside.

In the invention, it is also assumed that a windshield wiper is made of a self-resilient insert, approximately the length of a conventional wiper rubber, which adapts to the curvature of the windshield during the wiping process, and also a sheath which accommodates this insert and to which a wiper rubber is attached.

According to the invention, this cover now consists of an elastomer or of a similar material which is applied to the insert in an injection molding or casting process in such a way that the latter is firmly embedded in the cover.

The insert and the cover form a self-contained unit that meets the requirements placed on a windshield wiper. One of these

The requirements are the weather independence, which is ^" essential for a windshield wiper exposed to any weather situation. Due to the closed unit of insert and covering, which the wiper lips support, no water can penetrate into the interior of the windshield wiper, which at low temperatures This closed unit also offers ice formation due to their improved cross-sectional stability, the guarantee for a smooth movement of the oscillating wiper.

These are serious advantages of the windshield wiper according to the invention compared to the known constructions mentioned at the outset, in which a covering is placed more or less loosely over the resilient insert, with the result that there is no intimate connection between the insert and the covering. Water can then freely enter the space between the insert and the wrapping and thus make such a wiper unsuitable in a short time due to ice formation.

Appropriate embodiments of the invention are explained below.

The insert of the windshield wiper according to the invention can consist of stamped and bent spring steel, but it can also be produced as injection-molded or cast thermoplastics or thermosets. In the former case, the covering is expediently vulcanized onto the metallic insert. In the case of an insert made of injection-molded or cast thermoplastics or thermosets, this is done

Embedding the insert in the sheath expediently as a chemical compound at temperatures from 180 to about 200 degrees. At this temperature, the crosslinking agent isocyanate emerges from the elastomer of the covering and forms a chemical connection with the plastic of the covering. In both cases it is achieved that the insert and the wrapping form a self-contained unit.

To increase the elasticity, the insert is expediently partially or over its entire length

Cutouts introduced. It is also advisable to provide the insert with cross bars on one or both sides, which are arranged at short intervals. The effect of these recesses and the cross bars will be discussed later.

It is also advisable to form the insert to achieve the desired spring action with a profile that tapers from its center towards the two ends and that merges into a flat profile at both ends.

In a special embodiment of the invention, the insert has a flat, wing-shaped profile. Such a wiper has a particularly high transverse stability.

In a windshield wiper according to the invention, one or more wiper rubbers can be inserted or integrated into a flat side of the casing.

The wiping rubbers expediently have a circularly profiled edge on which they roll when they change direction during the wiping process. In such an embodiment, the wear effect is particularly low. The windshield wiper according to the invention can either be operated on one side in a known manner, in that the one end of the casing merges into a wiper arm which has sufficient stability, or else a wiper arm is articulated to the center of the casing.

In a special version of the windshield wiper with two wiper rubbers running parallel to one another, the insert has a longitudinal axis with rollers, the latter serving the task of determining the distance between the windshield and wiper rubber and, if necessary, relieving the pressure on the wiper rubbers in the park position.

In this case, one or more hoses for the supply of cleaning liquid and steam as well as, if applicable, warm air for deicing are additionally accommodated in the covering.

In a further embodiment of the windshield wiper with two mutually parallel wiper rubbers, which are fastened to the casing, nozzles are inserted into the space between these wiper rubbers, which on the one hand hold a water hose on the casing, on the other hand pass through the casing and the insert and cleaning water into spray the space between the wiper rubbers.

Embodiments of the invention will now be explained with reference to the drawings. Show it:

1 is a top view of a wiper in perspective, partly in section, 2 shows a cross section of such a windshield wiper along the section AB of FIG. 1,

3 shows a cross section along the section C-D of FIG. 1,

4 shows a detail of the insert,

Fig. 5/6 two mutually perpendicular representations of a wiper with

Mounting arm on one side,

7 shows a windshield wiper with a fastening of the wiper arm in its center,

8 is a perspective view of an embodiment with two wiper arms,

9 shows a partial cross section through an arrangement according to FIG. 8

Fig. 10 shows a novel design of the lower edge of a wiper arm.

11 shows the top view of a windshield wiper in a perspective view, partly in section, with a different cross-sectional shape of the insert and the covering.

12 shows a cross section of such a windshield wiper along the section E-F of FIG. 11

Fig. 13 shows a cross section through a wiper two wiper lips with supply of spray water to the wiper lips.

The basic structure of a windshield wiper according to the invention results from FIGS. 1 to 4. An insert 1 to be described in more detail is enclosed by an injection-molded or cast cover 2 made of elastomers or a similar material. The squeegee 3 is inserted into a groove on the underside of this casing 2 and thus its elastic

Inclusion in the envelope 2 guaranteed. However, the shape of the casing is determined by the insert 1, which has a variable shape in the longitudinal direction of the windshield wiper. Almost at the end of the windshield wiper, this insert is flat, as can be seen from the

3 shows cross-sectional image. At this point, the insert is labeled 5. In order to increase the elasticity, it is provided with cutouts 6 at short intervals, which at the same time serve for mechanical anchoring with the covering made of softer material (elastomer). In the direction of the center, this insert 1 assumes a cross-sectional shape 8 according to FIG. 2 (sectional view in the direction A-B). In addition, as shown in FIG. 4, cross bars 7 on one or both sides are used at short intervals.

While in the embodiment according to FIGS. 1 to 4, which corresponds to a windshield wiper according to FIG. 7 with a wiper arm 10 engaging in the middle thereof, the wiper rubber 3 is pushed into a groove in the casing 2, in a modified embodiment the casing 2 can be sprayed. or casting process can be produced in one operation with the squeegee 3, ie the wiper rubber 3 is integrated in the casing.

5 and 6, a wiper of the same construction as explained in the previous figures is shown, but it is such an embodiment in which one end of the wiper blade merges into the wiper arm. This arm then has a socket 9, via which the attachment to the vehicle takes place.

8 and 9, a further embodiment of the invention is shown, in which two identical wipers 13 and 14 are inserted into the casing 11. Here too, the insert 12 made of stamped and bent spring steel is largely enclosed by the covering 11. The insert 12, however, has a central part which serves to accommodate a longitudinal axis 15. On this axis guide rollers 16 are placed, which have the task of adjusting the distance between the disc and squeegees. For this purpose, however, this axis must be adjustable perpendicular to its longitudinal direction, which is not shown in the cross-sectional view according to FIG. 9 for the sake of simplicity. The guide rollers are labeled 16, the axis is number 15. The two squeegees are labeled 13 and 14.

In the perspective view according to FIG. 8, one can still see the guide channels 17 into which the two squeegees 13 and 14 are inserted. In addition, a hose 18 can also be seen, which is used to supply

Cleaning liquid and, if necessary, warm air serves to defrost the windshield wiper. 10 shows an embodiment of a wiper rubber which has proven to be particularly advantageous. In this embodiment, the wiper rubbers 23 have an edge 24 with a circular profile, on which they roll when they change direction. This results from the two representations of the windshield wipers 21. In the position 19, the wiper edge 24 rests vertically on the windshield, in addition the windshield wiper 21 is shown in the position 20 in which the windshield wiper edge 24 is rolled on the windshield surface 22. Since 23 and 24 have a fixed radius, the arrangement is inherently stable. The wiper lips are self-sharpening. This embodiment is not limited to the invention, but can be used in general.

FIGS. 11, 12 and 13 show embodiments of the invention in which the inserts 25 and 31 have a flat, wing-shaped profile. This profile, which can also be called double elliptical, results in an insert that is more flexible in its curvature and provides increased stability in the transverse load. The covering 26 applied to an insert 25 of such a shape consequently assumes a similar cross-sectional shape. As in the embodiment according to FIG. 1, the wiper lip 27 is pushed into this casing 26. According to FIG. 12, the wiper lip slides on the window 22.

In Figure 11, the recesses 29 and the transverse ribs 28 can still be seen. After the covering 26 has been applied to the insert 25, the transverse ribs 28 pass through the covering 26 and form there minor increases 30.

In one embodiment of the windshield wiper, of which a cross-sectional image is shown in FIG. 13, a nozzle 36, 37 can be seen, which is anchored in a water hose 33 and is carried out by the covering 32 and insert 31. Via such a nozzle, spray water is sprayed out of the water hose 33 into the space between the two wiper arms 34 and 35. Such nozzles are arranged approximately every 3 to 5 centimeters along the wiper; they are also made of plastic. At the same time, these nozzles cause the water hose 33 to rest firmly on the surface of the casing.

Claims

Claims i

1.Wipers for vehicles of all types with a circular, oscillating or rectilinearly oscillating movement of the wiper blade, consisting of a self-resilient, approximately the length of a conventional squeegee (3) having insert (1), which adapts to the curvature of the window and further one of these

Insert (1) receiving cover (2) on which a squeegee (3) is attached, characterized in that this cover (2) consists of an elastomer or a similar material which is injection molded or cast in this way onto the insert (1 ) is applied that the latter is firmly embedded in the casing (2).

2. Windscreen wiper according to claim 1, characterized in that the insert (1) consists of stamped and bent spring steel.

3. Windshield wiper according to claim 1, characterized in that the insert (1) is made as an injection molded or cast thermoplastic or thermoset.

4. Windshield wiper according to claim 1 and 2, characterized in that the covering (2) is vulcanized onto the metallic insert (1).

5. Windscreen wiper according to claim 1 and 3, characterized in that the embedding of the insert (1) in the casing (2) as a chemical compound at temperatures of 180 degrees to 200 degrees.

6. Windshield wiper according to claim 1 to 5, characterized in that the insert (1, 25) partially or over its entire length has its elasticity-increasing recesses (6, 29) (Figures 4 and 11).

Windscreen wiper according to Claims 1 to 6, characterized in that the insert (1, 25) has transverse strips (7, 28) applied on one or both sides (FIGS. 4 and 11).

8. Windshield wiper according to claim 1 to 7, characterized in that the insert (1) is formed to achieve the desired spring action with from its center tapering to the two ends profile, which merges at the two ends in a flat profile (5) (Figures 1 and 7).

9. Windshield wiper according to claim 1 to 8, characterized in that the insert (25, 31) has a flat, wind-wing-shaped profile (Figure 11 to 13).

10. Windshield wiper according to claim 1 to 9, characterized in that one or more wiper rubbers (3) are inserted or integrated in a flat side of the casing (2) (Figures 1 and 2).

11. Windscreen wiper according to claim 1 to 10, characterized in that the or the wiper rubbers (23) have a circular profiled edge (24) on which they roll during their change of direction during the wiping process (Figure 10).

12. A wiper according to claim 1 to 11, characterized in that one end of the sheath (2) merges into a wiper arm (9) having sufficient stability (Figures 5 and 6).

13. Windscreen wiper according to claim 1 to 11, characterized in that a wiper arm (10) is articulated to the center of the casing (2) (Figure 7).

14. Windshield wiper according to claim 1 to 13, characterized in that in an embodiment of the casing (11) with two mutually parallel wiper rubbers (13, 14), the insert (12) has a longitudinal axis (15) with rollers (16), which the latter serve the task of determining the distance between the windshield and the wiper rubbers (13, 14) and, if necessary, relieving the load on the wiper rubbers (13, 14) in the park position (FIG. 9).

15. Windshield wiper according to claim 14, characterized in that one or more hoses (18) for supplying cleaning liquid and steam and optionally hot air for deicing are additionally accommodated in the casing (11) (Figure 8).

6. Windscreen wiper according to claim 1 to 13, characterized in that in one embodiment of the casing

(32) with two mutually parallel wiper rubbers (34, 35) in the space between these wiper rubbers (34, 35), nozzles (36, 37) are inserted, which on the one hand a water hose

Hold (33) on the cover (32), on the other hand pass through the cover (32) and insert (31) and spray cleaning water into the space between the wiper rubbers (34, 35) (Figure 13).