• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:BE1020665A3
    申请号:E201000396
    申请日:2010-07-02
    公开日:2014-03-04
    发明作者:Eric Pieters
    申请人:Robert Bosch Gmbh Soc；
    IPC主号:
    专利说明:

    "METHOD OF MANUFACTURING A WIPER BLADE AND ICE WIPER BLADE SO REALIZED"
    Field of the invention
    The present invention relates to a method for manufacturing a wiping blade of a wiper, in particular an elastomer wiper, of a vehicle, the wiper blade having at least one substantially rectangular edge, wherein the elastomer is first extruded and then vulcanized.
    The invention also relates to the wiper blade made with such a wiper blade.
    State of the art
    The wiper blade is generally used for sweeping drops, especially drops of water on a window. The field of application of the wiper blade is for example that of glass panes or plastic. The fields of application of such wiper blades are, for example, wiper blades fitted to motor vehicles or squeegees used for domestic applications, for example for cleaning windows.
    The wiper blades are usually made in the form of an elastomeric profile. The wiper blade can be manufactured by injection or extrusion. When the windscreen wiper blade is manufactured by extrusion, an endless profile is first extruded and the different wiper blades are cut to length. When manufacturing the wiper blades by injection, the different blades are made directly to the injection length. However, the extrusion process is the usual manufacturing process.
    In order to manufacture a wiper blade, a mixture of uncured materials, for example unvulcanized rubber, is generally produced and then vulcanized. Currently, double profiles are manufactured with two wiper blades each connected by their edge. After the shaping and vulcanization of the elastomer, the double profile is cut along the wiping edge to thereby obtain separate wiper blades.
    The manufacture of wiper blades in the form of double profiles which are separated after extrusion and vulcanization is a common practice and has been described many times.
    A disadvantage of manufacturing a dual profile is the additional devices needed to cut the profiles. When extruding a simple profile, it is disadvantageous that the ridges of the extruded product are rounded due to swelling of the extrusion cord. This rounded shape reduces the wiping quality of such wiper blades relative to the wiping quality of a blade made from a double profile. By cutting the double profile after extrusion and vulcanization, sharp edges are obtained at the wiping lip while the edges of the wiping lips obtained by extrusion of simple profiles are rounded.
    Description and advantages of the invention
    The present invention relates to a method of the type defined above, characterized in that the extrusion tool is designed so that at least one of the sides adjacent to the edge is formed first with a curvature for that immediately after extrusion, the edge is formed with an acute angle.
    The method of manufacturing a wiper blade wiper according to the invention has the advantage of forming a wiper blade whose edge has an acute angle directly after extrusion, so that the curvature of at least one of the sides adjacent to the edge and the acute angle thus formed compensates for the swelling of the extrusion bead at the extrusion outlet. Thus, after the extrusion, a profile with a right angle forming a sharp edge is obtained.
    The edge made at an acute angle is in particular the wiping edge of the blade. Thus, the edge of the blade maintains a sharp edge which improves the quality of the wiping of a window with the wiper blade provided with such a blade.
    The sharp wiping edge results from the process of the invention in the case of manufacture with a single cord. It is not necessary to make the wiper blade as a double cord and then cut the two blades to obtain an edge. The wiping edge also has a smoother surface than in the case of making a double cord followed by cutting to form single cords.
    According to a preferred feature, there is a second edge facing the substantially rectangular edge and this second edge is itself substantially rectangular so that the wiper blade has a substantially rectangular termination. With this shaping, the wiper blade is substantially symmetrical. This solution has the advantage of making the wiper blade independent of the mounting direction in the windscreen wiper blade and also ensuring a quality wiping result in both directions of movement of the wiper blade. wiping. This is particularly desirable for a motor vehicle windshield wiper blade for removing the water film from the windshield or rear window with each sweeping motion by the wiper blade.
    In order for the second edge substantially facing the rectangular edge to also have a rectangular section, it is advantageous that at least one of the sides adjacent to the second edge is formed with an extrusion curvature. By making at least one of the sides adjacent to the second edge with a curvature, the second edge also leaves the extrusion tool at an acute angle. While exiting the extrusion tool, despite the swelling of the cord that then occurs, the edge will have a right angle. The swelling of the bead resulting from its shaping by the extrusion tool causes the edge to be rectangular and ends with a sharp edge. This avoids any rounded shape of the ridge.
    According to an advantageous feature of the method, the opposite sides of the substantially rectangular termination of the wiper blade are formed with a curvature and the front face connecting the two opposite sides is straight. The wiper blade thus obtained has an increasing width with respect to the wiping edge. To achieve the curvature, the width increases towards the wiping edge. In this way, two opposite concave surfaces are produced.
    In addition to the embodiment with two opposite sides provided with a curvature and a right side connecting the two opposite sides, it is also possible to give a curvature to this side connecting the two opposite sides. In order for the ridge to become rectangular by the swelling of the bead, the curvature of the side connecting the opposite sides is also concave.
    If the wiper blade is to have a substantially rectangular termination, it is not sufficient to give a concave curvature to the single side connecting the two opposite sides but it is necessary that at least the two opposite sides have a curvature.
    A substantially straight angle is obtained at the edge if the acute angle formed by the curvature is in a range of between 89.9 ° and 20 °, preferably in a range of 85 ° to 45 °. range between 75 ° and 60 °. The respective acute angle, however, also depends on the material in which the wiper blade is made, as well as the extrusion pressure of the material.
    To have a concave curvature, the curvature has an outer radius which is preferably in a range of 0.1 to 20 mm and preferably in a range of between 0.2 and 10 mm and in particular in a range between 0.5 and 3 mm.
    Depending on the material used and the extrusion pressure, the curvature may be a segment of a circle, ellipse or hyperbola. It is also possible to give the curvature the shape of a parabola or a segment of a circle. Preferably, the curvature is in the form of a segment of a circle.
    As a material for the wiper blade, any suitable elastomer may be used to make the wiper blades, such as, for example, natural rubber (NR), chloroprene rubber (CR), butadiene rubber (BR), styrene butadiene rubber (SBR), ethylene propylene copolymers (EPM), ethylene propylene diene terpolymers (EPDM), ethylene vinyl acetate copolymers (EVM), chlorinated polyethylenes (CM), chlorosulfonated polyethylenes ( CSM), acrylonitrile butadiene rubber (NBR), acrylonitrile butadiene hydrogen rubber (HNBR), fluororubber (FPM), polyurethane elastomer (PUR), acrylonitrile butadiene rubber and polyvinyl chloride (NBR) blends / PVC), as well as mixtures of these materials.
    In a particularly preferred manner, the ethylene propylene diene thermopolymer, the natural rubber, the chloroprene rubber or a mixture thereof are chosen as elastomers.
    After extrusion, it is possible to provide a coating the wiper blade or at least the wiping edge of the blade. Suitable coatings contain, for example, friction reducing additives such as dry lubricant particles.
    drawings
    The method of the invention will be described below with the aid of the accompanying drawings in which: - Figure 1 is a section of a wiper blade according to the invention directly at its output of the extrusion tool - Figure 2 is a section of a wiper blade according to the invention after swelling of the extrusion cord.
    Description of Embodiments of the Invention
    Figure 1 shows the section of a wiper blade according to the invention directly after its exit from the extrusion tool and the extrusion tool has a section corresponding exactly to that shown.
    A wiper blade 1 such as that fitted to the wipers of a motor vehicle, generally comprises a base segment 3 and a lip segment 5. The base segment 3 and the lip segment 5 are connected by A tilting spacer 7. The tilting spacer 7 allows the lip segment 5 to bend in the wiping direction of the wiping blade 1, thus ensuring wiping without trace or drag.
    In the embodiment shown, for fixing the wiper blade 1, its base segment 3 comprises for example two opposite grooves 9.1, 9.2. The grooves 9.1, 9.2 allow the gripping of clamps for fastening the wiper blade 1.
    The tip of the lip segment 5 has wiping edges 11 which pass over the pane to be cleaned to remove the water.
    According to the invention, the wiper blade 1 is manufactured by extrusion. For this purpose, an extruder is usually used which may comprise one or more extrusion screws. The polymer used to make the wiper blade 1 is put in the extruder, heated and the material is pressed under high pressure through the extrusion tool. The extrusion tool has a section like that shown in Figure 1.
    As the plastic material used to make the wiper blade, any form of elastomer commonly used for wiper blades can be used. These include the following materials: natural rubber (NR), chloroprene rubber (CR), butadiene rubber (BR), styrene butadiene rubber (SBR), ethylene propylene copolymers (EPM), ethylene terpolymers propylene diene (EPDM), ethylene vinyl acetate copolymers (EVM), chlorinated polyethylenes (CM), chlorosulphonated polyethylenes (CSMs), acrylonitrile butadiene rubber (NBR), butadiene hydrogen rubber (HNBR), fluorinated rubber (FPM polyurethane elastomer (PUR), butadiene rubber and polyvinyl chloride (NBR / PVC) rubber blends, and blends of these materials.
    To obtain wiping results that do not depend on the scanning direction of the wiper blade 1, the blade is symmetrical with respect to the median plane passing through the line 13 of the blade 1.
    To have a satisfactory wiping quality, that is to say without drag, requires a wiping edge 11 which is lively. But as at the exit of the extrusion tool, because of the extrusion pressure, the cord swells, it will have a rounding effect, especially at the edges of the cord forming the wiper blade 1. In other words, the extrusion does not make wiping edges 11 that are bright. To compensate for the rounding effect resulting from extension or swelling of the bead, at least one side adjacent to the wiper edge 11 has a concave curvature. To compensate for the swelling or expansion of the cord, this curvature is concave. The curvature has for example in section, the shape of an ellipse segment or a hyperbola segment. It is also possible to give the curvature of the section, the shape of a parabola segment or a segment of a circle.
    By symmetry, the second side 17 facing the first side 15, also has a concave curvature. The expansion or swelling of the cord at the exit of the extrusion tool, thus increases the volume of the wiper blade and the sides 15, 17 of concave shape, are pushed outwardly. This gives a rectangular termination to the wiper blade so that the ridges 11 each have a substantially rectangular cross-section as shown in FIG.
    The wiping edges 11 are connected by a front face 19 between the first side 15 and the second side 17. In the embodiment shown, the front side or face 19 is straight and has no curvature. Alternatively, it is also possible to give the front side 19 a concave curvature in addition to that of the first side 15 and the second side 19. If the front face 19 also has a concave curvature, this allows for example to reduce the curvature given on the first side 15 or on the second side 17. However, in general, it is not sufficient to have a concave curvature given to the front side 19 to obtain a wiper lip with rectangular termination.
    The curvature of the first side 15 or the second side 17 and, if appropriate, that of the end face 19, give the wiping edge 11 an acute angle. This acute angle formed between the first side 15 and the front face 19 or the second side 17 and the front face 19 has an amplitude preferably in a range of 89.9 ° to 10 °.
    Figure 2 shows the section of the wiper blade after swelling or expansion of the cord.
    The swelling of the cord after the exit of the polymer bead from the wiper blade leaving the extrusion tool causes the acute angle (as already discussed above) to deform at a right angle. Since the first side 15 or the second side 17 have a curvature, the wiping edge 11 will not be rounded, but will remain with a sharp edge. Thus, the method according to the invention makes it possible to obtain an extruded wiper blade in the form of a single bead. In other words, the invention makes it possible to eliminate the cut made after the extrusion of a double bead in order to have simple wiper blades.
    If the wiper blade is not used for a wiper blade of a motor vehicle, this allows for example to develop only one edge of the wiper blade as a wiping edge, in this blade, at least one adjacent side has a concave curvature. But in this case, we always wipe in the same direction. Such wiper blades may for example also be used for washing window panes.
    NOMENCLATURE OF MAIN ELEMENTS
    I wiper blade 3 base segment 5 lip segment 7 tilt spacer 9.1.9.2 opposite grooves II wiper edge 13 midplane 15 first side 17 second side 19 end face
    权利要求:
    Claims (8)
    [1]
    1) Method for manufacturing a wiping blade (1) of a wiper, in particular a vehicle elastomer wiper, the wiper blade (1) having at least one ridge ( 11) essentially rectangular, process according to which the elastomer is first extruded and then vulcanized, characterized in that the extrusion tool is made so that at least one of the sides (15, 17, 18 ) adjacent to the edge (11), is first formed with a concave curvature so that immediately after the extrusion, the edge (11) is formed with an acute angle (a).
    [2]
    2) Method according to claim 1, characterized in that the wiping edge (11) is that of the wiper blade (1).
    [3]
    Method according to Claim 1, characterized in that a second edge (11) is provided opposite the substantially rectangular edge (11), this second edge also being substantially rectangular so that the wiper blade ( 1) has a mainly rectangular termination.
    [4]
    4) Method according to claim 3, characterized in that at least one of the sides (15, 17, 19) adjacent to the second edge (11) is formed on extrusion with a concave curvature.
    [5]
    Method according to Claim 3, characterized in that the opposite sides (15, 17) of the substantially rectangular terminal have a curved shape and a straight connecting side (19) between the opposite sides (15, 17).
    [6]
    Method according to claim 1, characterized in that the acute angle (a) formed by the curvature is in the range of 10 ° to 89.9 °.
    [7]
    7 °) Method according to claim 1, characterized in that the curvature is carried out with outer radius and this radius is in a range of 0.1-20 mm.
    [8]
    Method according to claim 1, characterized in that the curvature is in the form of a circle segment, a parabola segment, an ellipse segment or a hyperbola segment.
    类似技术:
    公开号 | 公开日 | 专利标题
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    EP0211743B1|1989-10-18|Cold-deformable sealing joint
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    WO2006032389A1|2006-03-30|Single-piece windscreen wiper arm comprising a flexible intermediate section including transverse grooves
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    同族专利:
    公开号 | 公开日
    FR2947788B1|2016-12-09|
    DE102009027532A1|2011-01-20|
    FR2947788A1|2011-01-14|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US4981637A|1988-10-28|1991-01-01|Jmk International, Inc.|Method of forming an improved wiper blade|
    US5283927A|1991-05-31|1994-02-08|Jmk International, Inc.|Silicon rubber wiper blade with low coefficient of friction|
    GB2287179A|1994-03-11|1995-09-13|Nissan Motor|Wiper for motor vehicles|
    EP1288089A2|2001-08-29|2003-03-05|National Gummi AB|Wiper blade and a method for the manufacturing thereof|
    US20030165683A1|2001-12-06|2003-09-04|Sharabura Scott D.|Windshield wiper having reduced friction characteristics|
    DE2046189B2|1970-09-18|1979-06-13|Ego Dichtstoffwerke Gmbh & Co Betriebs Kg, 8000 Muenchen|Sealing profile|
    JPS5686842A|1979-12-14|1981-07-15|Haruki Iwata|Manufacture of wiper blade|
    US4881988A|1987-11-16|1989-11-21|Rjf International Corporation|Novel flexible magnet for use in small dc motors|DE102012211704A1|2012-07-05|2014-01-09|Robert Bosch Gmbh|Profiled wiping blade for windscreen wiper brush of car, has lip segment connected to base segment by profiled tilting web, where lip segment includes ethylene propylene diene monomer, and lip segment is arranged without coating|
    法律状态:
    2019-04-01| MM| Lapsed because of non-payment of the annual fee|Effective date: 20180731 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102009027532A|DE102009027532A1|2009-07-08|2009-07-08|Method for producing a wiper blade|
    DE102009027532|2009-07-08|
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