DE3346384C2 - Wiper arm, in particular for wiper systems on motor vehicles - Google Patents

Description

The invention is based on a wiper arm according to the features the preamble of claim 1.

In such known wiper arms, the joint part and the Wiper rod usually made from sheet steel, according to the mold is provided with a varnish coating. Such a On the one hand, coating has a favorable effect on the corrosion resistance of the wiper arm and, on the other hand, allows a special dere, for example adapted to the color of the motor vehicle Coloring of the joint part and wiper rod. A flawless one However, coating is relatively difficult to manufacture. Both Wiper arms are namely the wiper rod and the joint part often connected by rivets, although these ver type of binding has a number of disadvantages. So there is when incorporating the necessary to fix the rivets Breakthroughs and the riveting process the risk that the over train is damaged. Then expensive rework is required if not the corrosion resistance and appearance of the wiper arm should suffer. The corrosion resistance of the Wiper arms would be without rework at most in the cases guaranteed where parts of the wiper arm like in the wiper arm according to DE-AS 22 06 166 made of stainless steel consist. However, the use of stainless steel is more expensive the wiper arm essential. The wiper arm also detects DE-AS 22 06 166 as the wiper arms known from practice the disadvantage that the rivet heads from the surface of the Ge protruding steering part. Likewise, here too, because of the wiping rod is gripped by the walls of the joint part, unsightly Edges visible. Because the joint part is open on its underside is a spring that generates the contact pressure of the wiper arm element exposed to the weather and sometimes visible from inside the vehicle.

It is therefore an object of the invention to provide a wiper arm gangs mentioned type in such a way that he one in each in terms of flawless surface. Still should the wiper arm should be simple and inexpensive to manufacture.

This task is done with the characterizing part of the claim 1 solved. The main difference of such a structure Wiper arms compared to those according to the prior art is that essential parts of the wiper arm without upper Surface processing remain and / or be made of base metal can stand, since the coating according to the invention as self The molded part is formed which surrounds the wiper arm on all sides gives. In this case, the limitation listed in claim 1 Only the applicability with regard to the linear expansion the invention are secured on such wiper arms, the An pressure from one between them and the wiper shaft brought spring element is generated so that it is used as usual the pane can be folded down because of the coating the evasive movement of the spring element or the passage of the Fastener not hindered. Since the invention Coating on a unit and thus on already assembled Parts is applied, there is no risk that he during the assembly of the parts by drilling or stamping tools is damaged and must be improved.

If the coating is at least as thick as the walls of the joint is partly in the area of the junction of Wiper rod and joint part present, from the end faces edges made of the joint part are made invisible, even if the cover is close to the unit. If the Coating is so thick and the mechanical properties of Plastics are generally very good, also exists during the use of the wiper arm according to the invention less that Risk of damaging the wiper arm surface. Because of the variable thickness can also other edges, joints and son any irregularities in the unit are made invisible  be so that their outer surface appears smooth.

On plastics come especially those with spring elastic properties, since these shape their shape in mecha change reversibly. Because of the spring elastic properties, they can also independently tend and close to the unit.

Injection is used as the manufacturing process for the molded plastic part casting, casting, foaming, or dipping processes into consideration. Here plastics are known to come in liquid or past loosened condition with the component or one in the form of the construction partially complementary form in contact. Therefore, the Plastic optimally to the given shape of the component fit, so that especially tight-fitting covers gefer can be done. In order to use the dipping method suddenly thick plastic molded parts without too much time To be able to produce effort must only be sufficiently viscous Dip baths are used to reduce the number of dives is kept to a minimum.

It is also advantageous that due to the proposed Plastic molding the thickness of the coating without difficulty can be designed so large that an edgeless Transition to other components attached to the wiper arm, such as for example to the wiper blade connector can be achieved. With an even greater thickness, there is even the possibility a channel for the passage of a washing liquid supply to be provided in it. One or more thicker or thinner be Rich parts of the molded plastic part can also be locked of the molded plastic part are provided with the wiper arm, in which they serve as a locking projection or recess. Furthermore you can through thicker areas of the plastic molding Wiper arm improve aerodynamically by taking this  Forms areas with a streamlined profile. So are through the plastic molded part many improvements of the Wiper arms achievable without its production essential would become more expensive.

For separately injection molded or cast plastic molded parts len it is of great advantage if these are divided into two parts forms because the plastic molding is then easier on the Unit can be assembled. A film hinge prevents in a simple way that the two parts are lost go.

If the to be provided in the divided plastic molding arranged for the unit in the part or section is that after mounting the wiper arm on the vehicle or in Wiping of the window to be cleaned is turned away no disturbing joints in the direction of the wind flow, in which could collect water, ice or dirt.

When the two parts of the molded plastic part through on each other coordinated locking elements are releasably connectable to each other, the plastic molding can also be offered as a retrofit kit and even after replacing the wiper arm will.

Due to the molded plastic part according to the invention Material costs can be greatly reduced. At the joint part he do not fill the walls for most of their length function and are actually only with conventional wiper arms consistently trained for stylistic reasons. Because of him Wiper arm according to the invention, however, in the area of the joint part from Plastic molding is surrounded, the walls can be broken be designed, whereby the material costs and the Ge reduce the weight of the wiper arm.

Furthermore, the material costs can be reduced by that you manufacture the wiper rod with locking means that form a  conclusive determination of at least one of the ver with her binding components, namely the joint part, the connection pieces and / or the plastic molding allow because then no additional fasteners such as rivets or the like more are needed.

The cost of materials and components can be reduced even further if the verbin necessary to link the wiper blade piece made in one piece with the molded plastic part is and / or com with elements for washing liquid supply is binated.

The molded plastic part can also go over the joint part be extended to the rear and a fastener off cover, over which the joint part rotatably with a ange driven wiper shaft is connected or connectable. Then came This area of the wiper arm also has no special surfaces Processing remains or it becomes the usual cap saved for the fastener.

So that the plastic molding does not fold down in this case of the joint part prevented or hindered by the disc or is damaged when folded down by kinking, is pre beat, the joint part behind the wiper shaft on the fastening to articulate.

If the plastic molding is the attachment point of Wiper arm and wiper shaft covering, it is proposed that Plastic molding with a snap lock to provide a closable opening. Then that's it Usually designed as a screw or nut fastener means that the fastening part on the wiper shaft holds, if necessary without dismantling the molded plastic part and accessible without folding down the joint part.  

It is also proposed that the plastic molded part be over Extend the connection point between the wiper arm and the wiper blade to let it wipe the entire length of the wiper Can cover type of a wind deflector. In this case it is particularly advantageous for foamed plastic molded parts, when the wiper rod connects to the wiper sheet and up to the front end of the plastic molding enough because their stability against bending or kinking can be significantly improved.

Further advantageous details and refinements of the Er invention are the other claims and the drawing remove.

Here shows:

Fig. 1 shows a longitudinal section through a wiper arm,

Fig. 2, 3 and 4 are partial views of the wiper arm illustrated in Fig. 1,

A wiper arm Fig. 5 shows a longitudinal section through a modern fiction, further,

Fig. 6 shows a section along the line VI-VI of Fig. 5,

Fig. 7 shows a longitudinal section through a third wiper arm according to the Invention

Fig. 8 to 11 different embodiments of the plastic molding, in cross section,

Fig. 12 u. 13 each show a longitudinal section through a fourth and fifth wiper arm according to the invention and the

Fig. U 14. 15 cuts along the Uriie XIV-XIV or XV-XV of Fig. 13.

The wiper arms shown in FIGS . 1 to 7 each have a fastening part 10 , known per se, on which a duct-like, cross-sectionally substantially U-shaped joint part 20 made of sheet steel is articulated in front of a wiper shaft 12 via a joint rivet 11 , which in Fig. 2 is shown in more detail. The joint part 20 has a central wall 21 , which connects two side walls 22 . Both the middle wall 21 and the side walls 22 are penetrated by openings 23 , so that the hinge part 20 conveys a net-like pressure. It is fixed to a first end 24 with its side walls 22 on Gelenkniet 11 while tapering conically towards its second end 25 and with its side walls 22 and the central wall 21 is rectangular in cross-section the wiper rod 30 form-fitting encompasses which in more detail in Fig. 3 is shown. For this purpose, a plurality of notches 31 are embossed into the longitudinal sides of the wiper rod 30 , into which the joint part 20 engages by means of notches 26 which are notched in its side walls 22 . By embossing the notches 31 are in the softer steel sheet than the hinge part 20 existing wiper rod 30 also humped projections 32 are formed, which stick out from the top of the wiper rod 30 . The purpose of these projections 32 is evident from the description of FIGS . 1, 8 and 9 below.

In addition, at the distal end of the joint part 20 of the wiping rod 30 teeth 33 are embossed, which in addition to notch-like recesses 34 also have sharp-edged projections 35 , onto which a connector 40 made of a resilient polyoxide is snapped, which has an insertion channel 41 has, whose width is slightly smaller than the width b of the wiper rod 30 . Otherwise, the connec tion piece 40 is constructed in a manner known per se and has a plurality of spring tabs 42 which can flexibly enclose a wiper blade bolt.

At the inside of the hinge part 20 end of the wiper rod 30 , a spring element 50 is suspended, which is realized by a tension spring, which is fixed via a C-shaped auxiliary bracket 60 and a pin 65 on the fastening part 10 and for the necessary for optimal window cleaning Ensures the pressure of the wiper arm or wiper blade. The ge from the wiper rod 30 , the hinge part 20 and the tension spring 50 formed units of the three wiper arms are almost over their entire length of a plastic molded part 70 made of a polyoxide, which protects the wiper arm against corrosion and against the action of water and dirt. In the wiper arm according to FIG. 7 there is also a hose 80 for supplying washing liquid from the molded part 70 .

The wiper arm according to Figs. 1, 8 and 9 the molding is made by injection molding of polyoxide in a well of a shape to 70, which surrounds a core in its shape of the Ge of the assembly Stalt corresponds to when the U-shaped cross-section of the joint part 20 to a ring is thought closed. As a result, the molded part 70 has a receptacle 100 which can tightly enclose the structural unit. FIGS. 8 and 9 show cross sections through the finished molded part 70 , which correspond to cross sections along lines VIII-VIII and IX-IX of FIG. 1. As these figures show, the molded part 70 is seamless and is expediently pushed onto the structural unit from the wiper rod. As shown in FIG. 9, the contour line of the molded part 70 follows approximately a triangle in its area 71 which surrounds the wiper rod 30 , so that the incident head wind can be easily diverted. Towards the connecting piece 40 , the thickness of the molded part 70 is changed in a step-like manner in such a way that there is a tight and edgeless transition to the connecting piece 40 , as shown in FIG. 1. As shown in FIGS. 1 further shows, ranges the molding 70 on the bottom of the assembly only to the rear pivot point 51 of the tension spring 50 so that the C-bracket 60 is exposed and the wiper arm can be folded away from the disk. Otherwise, the molded part 70 surrounds the assembly consisting of wiper rod 30 , joint part 20 , tension spring 50 and C-bracket 60 on its upper side facing away from the pane to be cleaned and the two long sides up to the rear end 29 . The projections 32 protruding from the wiper rod 30 ensure a good hold of the plastic molded part 70 . The thickness of the molded part 70 decreases continuously at its the connection point of the wiper rod 30 and the joint part 20 area, so that the edges of the joint part 20 can be pressed out of the molded part 70 without elevations, and ultimately the entire structural unit is covered has edgeless outer surface. As shown in FIG. 4, the molded part 70 extends on the two long sides to over the rivet 11 , so that both its setting head and its closing head are covered. Since, in addition to the encased component, a cover cap 90 is also articulated on the articulated rivet 11 , which consists of the same polyoxide as the molded part 70 and covers the fastening part 10 from above, from the sides and from behind and on the upper side facing away from the disc is preferred under the Ge joint part 20 (see. Fig. 1), the entire wiper arm is optimally protected against corrosion and offers a wall-free stylistic sight.

In Figs. 10 and 11 are represented by different aufgebau te invention plastic moldings 70 are cross sections may be flat if found to advantage in the assembly of FIG. 1 using. The cross sections correspond approximately to those along line VIII-VIII of FIG. 1. The molded part 70 shown in FIG. 10 consists of an upper part 72 with a U-shaped cross section and a lower part 73 with a rectangular cross section. Both parts 72 , 73 are made of the same polyoxide by injection molding into a mold which has several depressions, the dimensions of which correspond to the desired size of the parts 72 , 73 . The parting plane between the parts 72 , 73 was placed during production so that the receptacle 100 for the wiper arm is completely in the upper part 72 . The upper part 72 has along both longitudinal sides 72 a, 72 b, bead-like thickenings 74 , on which the lower part 73 is locked with its accordingly shaped recesses 75 . Preferably, the assembly of the parts 72 , 73 on the wiper arm is carried out in such a way that first the upper part 72 is clipped onto the wiper arm from the side of the wiper arm that faces away from the window to be cleaned, and then the lower part 73 is attached to the upper part 72 is buttoned. Then the joints between the two parts 72 , 73 caused by the two-piece production do not disturb the stylistic impression of the wiper arm.

The molded part 70 shown in FIG. 11 is constructed essentially like the molded part 70 shown in FIG. 10. It has an upper part 72 which is U-shaped in cross section with bead-like thickenings 74 along its longitudinal sides 72 a and 72 b and a lower part 73 which is rectangular in cross section. The lower part 73 is here, however, in one piece by a film hinge 76 with the one long side 72 a of the upper part 72 connected. This has the great advantage that the lower part 73 cannot be lost before mounting on the wiper arm. The plastic parts shown in FIGS. 10 and 11 are particularly easy to assemble and are therefore also suitable for retrofitting wiper arms by amateurs.

The wiper arm according to Fig. 5 is surrounded by a jointless Kunststof molding 70, which from the connecting piece 40 from the wiper rod 30 at all longitudinal sides over the entire length and the hinge part 20 at its center wall and on its side walls over the entire length and to which the Covering the middle wall on the opposite side up to the C-bracket 60 . In contrast to the example shown in Fig. 1 mold part 70, however, the molded part 70 shown in FIGS. 5 and 6 is similar to the wiper rod 30 to the C-frame 60 of a wind deflector and is very thick. It has a cross-section reminiscent of a club over its entire length, the surface 77 curved toward the wiper rod 30 acting as a wind deflector surface. This embodiment has the great advantage that no further measures need to be taken to improve the aerodynamic behavior of the wiper arm.

The wiper arm of Fig. 7 is surrounded also by a seamless plastic molding 70 which from the wiper rod 30 and its sides walls of the connecting piece 40 on all longitudinal sides over the entire length and the hinge part 20 at its central wall over the entire length and at the center wall against overlying side up to C-bracket 60 .

The plastic molding 70 here, however, has a bore 78 extending in the wiping rod longitudinal direction, which serves as a washing liquid line. The bore 78 is recessed from the underside of the molded part 70 and passes through it approximately from the front end of the joint part 20 to the connecting piece 40 . The connector 40 has a bore 43 which is aligned with the bore 78 and is connected to this by a nozzle 110 made of an elastic plastic, which has a slightly larger outer diameter than the diameter of the bores 78 , 43 at the ends facing each other is. The two bores 78 , 43 are therefore connected to one another without leakage. The bore 43 ends on a side surface of the connector 40 in an angled end 43 a, into which a nozzle body is buttoned who can. In the rear end 78 a of the bore 78 , a rubber hose 80 is inserted, which runs through the cavity enclosed by the joint part 20 and the molded part 70 and leaves the unit from an opening left in the area of the C-bracket 60 and to a washing fluid reservoir, not shown runs. This embodiment has the advantage that an optimal supply of washing liquid to the wiper blade is possible.

In the wiper arms shown in FIGS . 12 to 15, the joint part 20 is articulated via a rivet 11 behind the wiper shaft 12 . The molded plastic part 70 is extended to the rear and also covers the fastening part 10 . The plastic molding 70 shown in Fig. 12 consists of a polyurethane foam and is made by completely Umschäu men the wiper rod 30 with the exception of their connection to the wiper blade enabling hooking and foaming of the Ge joint part 20 and the fastening part 10 from above and from the side, while the plastic molding 70 shown in FIGS. 13 to 15 is composed of two separately injection molded parts 72 and 73 , which were then placed in a jacket-like manner around the wiper arm and locked together. At the part 72 forming the upper part, bol zen-like approaches 72 c have been injected, which are guided through openings 36 in the wiper rod 30 and after Warmver form and press in the direction of the wiper rod 30, a rivet-like connection between the upper part 72 and the wiper rod 30 is guaranteed Afford. Care was taken that the sprayed in the area of the wiper rod 30 approximately with the same thickness as the walls of the joint part 20 upper part 72 by a flange-like area 72 d of the lugs 72 c at a distance from the wiper rod 30 so that the joint part 20th with its front edges does not press any kinks into the plastic molding 70 , which would disturb the visual impression.

The joint parts 20 of both wiper arms and both plastic mold parts 70 have openings 20 a and 70 a, through which the nut 12 a is accessible if necessary without folding down the wiper arm, which holds the fastening part 10 on the wiper shaft 12 . In the breakthroughs 20 a and 70 a, a closure cap 120 is clipped in, which ends in one plane with the side of the plastic molding 70 facing away from the pane, so that the uniform impression of the wiper arm surface is also guaranteed here.

The contact pressure of the wiper arms is generated by means of compression springs 130 , which are designed as cylindrical helical springs and surround a mandrel 131 , which is rotatable about a pin 132 at the front end 13 of the fastening part 10 . As shown in FIGS. 12 and 13, there is provided by this type of Druckfederanlenkung at the front end attachment part 13 and the Gelenkteilanlenkung behind the wiper shaft 12 and below the Wischarmbefestigungsstelle 12 a, a particularly narrower and shallower wiper arm.

At its articulated on the pin 132 end of the mandrel 131 has stop shoulders 131 a for the first end 130 a of the compression spring 130 . With its other end, the mandrel 131 engages through a hole in a right angled down set of the wiper rod 30 , on which the compression spring 130 bears directly with its second end 130 b in the embodiment shown in FIG. 12. In the embodiment shown in FIG. 13, the compression spring 130 rests on an intermediate piece 133 made of a plastic with good sliding properties at the base of the wiper rod 30 . The intermediate piece 133 engages around the second end 130 b of the compression spring 130 and is formed on its side facing the wiper rod end from crowned. As a result, the compression spring 130 when wiping he curved pane areas and when folding the wiper arm from the pane without bending quickly and without squeaking noise can perform a compensating movement with respect to the wiper rod 30 .

In the embodiment shown in FIGS. 13 to 15, the compression spring 130 is covered from below to close to its first end 130 a, and at a distance from the compression spring 130 the lower part 73 of the plastic molded part 70 is covered. In its nem in the vertical direction with the compression spring 130 , the area of the lower part 73 is longitudinally slotted and open, as shown in FIG. 15. In the embodiment shown in FIG. 12, the compression spring 130 is covered from below by a separately manufactured cover 140 , which adjoins the lower ends of the plastic molded part 70 without edges. The cover 140 has a recess 141 , which begins shortly after the vertical wall 142 of the cover 140 with a width corresponding to the width of the fastening part 10 , up to the first end 130 a of the compression spring 130 to the front with this width and then with one Diameter of the compression spring 130 continues corresponding width and ends before the second end of the mandrel 131 . Due to the recess 141 according to FIG. 12 or the longitudinal slot of the lower part 73 according to FIG. 15, the joint parts 20 can be folded down from the disk or from the fastening part 10 if necessary, without the plastic molded part 70 or the cover 140 being lifted by the spring 130 and the fastening part 10 damaged or dismantled.

In both embodiments, the plastic molding 70 is extended beyond the junction 150 of the wiper arm and wiper blade to the front and is made much thicker than in the other areas to form a wind deflector which provides the wiper blade with the greatest possible height over the entire length can cover. It is shown wherein in Figure 12, consist of a polyurethane foam the molded plastic part 70, the wiper rod 30 brought forward up to the free, front end of the wind deflector, so that its -. Stability is stet ensu against bending or buckling. The wiper blade is fastened to a hook 151 , which was riveted to a sheet 152 before foaming with the wiper rod 30 . In the wiper arm shown in FIG. 13, the wiper rod 30 has the usual length and is bent laterally to form a hook 151 to which the wiper blade is fastened. Here, the upper part 72 of the plastic molded part 70 is extended beyond the hook 151 and forms the wind deflector.

Finally, it should be pointed out that several of the individual shown in the individual exemplary embodiments units with a single wiper arm at the same time could be. Which could be, will change according to the current Direct requirements.

Claims (36)

1 . Wiper arm, in particular for wiper systems on motor vehicles, with a hinge part ( 20 ) which has a substantially channel-like shape with at least one middle wall ( 21 ) and two side walls ( 22 ) which firmly grip a wiper rod ( 30 ), at the other the joint part ( 20 ) distal end via a connecting piece ( 40 ) a wiper blade can be articulated on the wiper arm and the joint part ( 20 ) and the wiper rod ( 30 ) are made of metallic materials and are provided with a protective coating ( 70 ), thereby characterized in that the cover ( 70 ) consists of a molded plastic part ( 70 ) which consists of the wiper rod ( 30 ) and the joint part ( 20 ) and the elements ( 10 , 11 , 50 , 60 , 80 , 130) 131 , 132 , 133 ) enclosing the existing unit on all sides almost over the entire length. 2. Wiper arm according to claim 1, characterized in that the plastic molding ( 70 ) has a thickness which is at least as large as the wall thickness of the walls ( 21 , 22 ) of the joint part ( 20 ) and changes over the length of the structural unit. 3. Wiper arm according to claim 1 or 2, characterized in that the plastic molding ( 70 ) is made by an injection molding, a casting, a foaming or a dipping process from a preferably fe derelastic plastic. 4. Wiper arm according to claim 3, characterized in that the plastic molding ( 70 ) has a receptacle ( 100 ) which tightly encloses the structural unit. 5. Wiper arm according to claim 3, characterized in that the molded plastic part ( 70 ) encloses the structural unit at least over a part of its length at a certain distance and is connected to the structural unit, preferably in a snap-in manner, via blocks ( 72 c). 6. Wiper arm according to one of claims 2 to 5, characterized in that the plastic molding ( 70 ) from a polyoxide, preferably before a copolymer of the polymethylene oxide, by injection molding around the unit or by overmolding one of the Bauein unit is made of the same injection core. 7. Wiper arm according to one of claims 2 to 5, characterized in that the plastic molding ( 70 ) is made from a pasty solution of a vinyl chloride or vinyl acetate polymer by casting around the unit or by casting one of the Bauein unit casting core. 8. Wiper arm according to one of claims 2 to 7, characterized in that the plastic molding ( 70 ) is formed seamlessly. 9. Wiper arm according to one of claims 2 to 7, characterized in that the plastic molded part ( 70 ) consists in regions or entirely of two parts ( 72 , 73 ) which are detachably connected together along at least one long side ( 72 a, 72 b) . 10. Wiper arm according to claim 9, characterized in that the parts ( 72 , 73 ) along one long side ( 72 a) are integrally connected to one another by a film hinge ( 76 ). 11. Wiper arm according to claim 9 or 10, characterized in that the two parts ( 72 , 73 ) by mutually coordinated ele elements ( 74 , 75 ) of locking connections are interconnected. 12. Wiper arm according to one of claims 9 to 11, characterized in that the parting plane (s) is (are) provided such that the receptacle ( 100 ) in the disc to be cleaned is from the swept part ( 72 ). 13. Wiper arm according to at least one of the preceding claims, characterized in that the plastic molding ( 70 ) over a certain part of its length is designed as a wind deflector. 14. Wiper arm according to claim 13, characterized in that the plastic molded part ( 70 ) has an approximately triangular cross section, at least one side surface ( 77 ) acting as a wind guiding surface. 15. Wiper arm according to at least one of the preceding claims, characterized in that the joint part ( 20 ) is provided with openings ( 23 ). 16. Wiper arm according to claim 15, characterized in that both the central wall ( 21 ) and the side walls ( 22 ) of the hinge part ( 20 ) are penetrated by openings ( 23 ) such that the hinge part ( 20 ) arranged mainly from one another in a mesh-like manner Ribs exists. 17. Wiper arm according to claim 16, characterized in that the joint part ( 20 ) is articulated with its side walls ( 22 ) via a joint rivet ( 11 ) to a fastening part ( 10 ) connected in a rotationally fixed manner to a driven wiper shaft ( 12 ). 18. Wiper arm according to claim 17, characterized in that the plastic molding ( 70 ) covers both the setting head and the closing head of the rivet ( 11 ). 19. Wiper arm according to claim 18, characterized in that the fastening part ( 10 ) is covered by a cover cap ( 90 ) made of plastic, which extends in the longitudinal direction of the wiper arm up to the articulated rivet ( 11 ). 20. Wiper arm according to claim 19, characterized in that the plastic molded part ( 70 ) overlaps the covering cap ( 90 ) on its lying in the longitudinal direction of the wiper arm in front of the rivet ( 11 ). 21. Wiper arm according to at least one of the preceding claims, characterized in that the wiper rod ( 30 ) with latching means ( 31 , 32 , 33 , 34 , 35 , 36 ) for the positive locking of at least one of the components to be connected to it ( 20 , 40 , 70 ) is provided. 22. A wiper arm according to claim 21, characterized in that in the wiper rod ( 30 ) in the area of the connection point with the joint part ( 20 ) a plurality of notches ( 31 ) are impressed and that by embossing the notches ( 31 ) humped projections ( 32 ) gebil are det protrude from the surface of the wiper rod ( 30 ). 23. Wiper arm according to claims 16 and 22, characterized in that the hinge part ( 20 ) consists of a slightly soft steel sheet as the wiper rod ( 30 ) and in the ker ben ( 31 ) is buried. 24. Wiper arm according to at least one of claims 21 to 23, characterized in that at least one toothing ( 33 ) is stamped into the wiper rod ( 30 ) in the region of the connection point with the connecting piece ( 40 ) and that by stamping the toothing ( 33 ) sharp-edged projections ( 35 ) are formed, which protrude from the surface of the wiper rod ( 30 ). 25. Wiper arm according to claim 24, characterized in that the connecting piece ( 40 ) is made of a resilient plastic and that the sharp-edged projections ( 35 ) are buried in the plastic. 26. Wiper arm according to at least one of the preceding claims, characterized in that the connecting piece ( 40 ) and the plastic molding ( 70 ) merge into one another at least approximately without edges and joints. 27. Wiper arm according to claim 26 and at least one of claims 15 to 25, characterized in that the plastic molded part ( 70 ) and the connecting piece ( 40 ) have two bores ( 78 , 43 ) which run in the longitudinal direction of the wiper rod and are aligned with one another, which serve as a washing liquid line. 28. Wiper arm according to claim 26 or 27, characterized in that the connecting piece ( 40 ) and the plastic molding ( 70 ) are made in one piece. 29. Wiper arm according to claim 27 or 28, characterized in that the bores ( 78, 43 ) are connected to one another without leakage by a connecting piece ( 110 ) made of an elastic material. 30. Wiper arm according to at least one of claims 27 to 29, characterized in that an elastic hose ( 80 ) through the joint part ( 20 ) and inserted into the free end ( 78 a) of the plastic part ( 70 ) located bore ( 78 ) is. 31. Wiper arm according to at least one of claims 27 to 30, characterized in that in the free end ( 43 a) of the other bore ( 43 ) a nozzle body can be buttoned. 32. Wiper arm according to claim 17 or 18, characterized in that the plastic molding ( 70 ) is extended to the rear and covers the fastening part ( 10 ). 33. Wiper arm according to claim 32, characterized in that the plastic molded part ( 70 ) has a closable with a latching Ver cap ( 120 ) closable opening ( 70 a) through which, if necessary, a fastening means ( 12 a) if necessary through an opening ( 20 a) in the joint part ( 20 ) is accessible, which holds the fastening part ( 10 ) on the wiper shaft ( 12 ). 34. Wiper arm, in particular according to one of the preceding claims, characterized in that the plastic molding ( 70 ) extends beyond the connection point ( 150 ) of the wiper arm and wiper blade and the wiper blade covers at least approximately its entire length in the manner of a wind deflector. 35. Wiper arm according to claim 34, characterized in that the wiper rod ( 30 ) extends beyond the connection point ( 150 ) with the wiper blade and at least approximately to the front end of the plastic molding ( 70 ). 36. Wiper arm according to at least one of the preceding claims, characterized in that the open side of the Ge joint part ( 20 ) is covered by the plastic molded part ( 70 ) or by a cover ( 140 ) which is edgeless at the ends of the plastic molded part ( 70 ) connects and optionally has a recess ( 141 ), which allows the articulated part ( 20 ) to be folded down from the window without disassembly or damage to the plastic molded part ( 70 ) or the cover ( 140 ) by the springs ( 50 , 130 ).