FR2518944A1 - WINDSCREEN WIPER FOR MOTOR VEHICLE - Google Patents

Abstract

THE INVENTION RELATES TO A WINDSCREEN WIPER FOR A MOTOR VEHICLE. THIS WIPER INCLUDES A MAIN BRACKET WITH U-SHAPED SECTION, THE BACK 12 OF WHICH INCLUDES AN OPENING WHOSE CENTER CONSERVES A CROSS-TERMINAL 14. ON THIS CROSS-TIE 14, A PLASTIC CONNECTION 20 UNDERTAKING A BODY 21 AND TWO LEGS IS MOUNTED ELASTICS 22, 23. IN THE CENTER OF THE BODY 21, IS PROVIDED A HOUSING 26 WITH KNIVES 26A FOR THE SUPPORT OF THE CROSSBODY 14, THIS BEING INTRODUCED THROUGH A SLOT 25 INCLINED. AFTER INSERTION OF THE COUPLING UNIT 20 ON THE CROSSBAR 14, THE HOOK 31 OF THE WIPER ARM 30 IS INSERTED ON THE COUPLING UNIT, ON WHICH IT IS LOCKED, AND CLOSES THE SLOT 25 MAKING THE ASSEMBLY VERY SURE. THE INVENTION APPLIES TO WINDSCREEN WIPERS FOR MOTOR VEHICLES.

Description

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  The present invention relates to a windscreen wiper for vehicles

  automotive body comprising a main yoke, having a substantially U-shaped cross-section, two side walls and a back connecting the side walls, and a hinge provided in an open area of the back of the main yoke for an arm of wiper engaging via a coupling member, the hinge and the main yoke being in one piece, obtained from a

blank in t 6 on.

  Such a wiper is for example known from the German patent DE-PS 24 47 640 In this case, flat strips are cut from the back of the main yoke and formed into a roller which ensures the function of the ankle to rivet head, used instead

  in other cases, and represents the articulation for the wiper arm

  ice Special tools and a large production technique are needed to produce such a main stirrup, cracks

  and material distortions that can occur,

  laterally in relation to the joint.

  German patent application DE-OS 27 Il 109 discloses a wiper comprising a hinge for the wiper arm, which is also formed from the back of the main stirrup but whose

  Production technique seems to be more easily controlled.

  Probably also, in this version, material distortions can not be excluded, however, because the joint is also subject to significant deformation forces to obtain the shape.

  In addition, by arranging the articulation on one of the transverse edges

  the gap in the longitudinal direction of the wiper blade is so large that accidental extraction of the wiper arm is to be feared and the

  Wiper blade can be lost.

  An object of the present invention is to create a wiper

  ice of the type mentioned at the beginning of which the broom may be provided

  simple and economical way with a joint.

  This is achieved according to the invention by the fact that

  lation is formed as a flat crossbar which is arranged substantially

  in the center inside the open area of the back of the main stirrup.

  The blank of the main stirrup according to the invention can be produced and formed with a much simpler tool. In this case, neither cracks nor material distortions are to be feared because

  the joint is not produced during a separate forming action.

  The articulating surfaces around which a pivoting movement can be executed, are formed in this case by the coupling member exactly as the guide surfaces for the wiper arm. Lateral guidance with only a small clearance is particularly important. - lly possible when the joint is arranged slightly below the plane of the back of the main stirrup In this case, the coupling member can be better maintained in a position not movable by the side walls of the wiper blade In the wiper according to

  the invention, various plans are obtained in a simple manner during the operation

  bending ration when the surface of the blank at t 8 constituting the cross member is maintained at an orthogonal flexion with respect to the areas forming the side walls, while the area of the sheet metal blank forming the back is not loaded by pressure, of so that it is slightly curved

  up after the folding operation.

  The de-coupling member can thus be locked immovably with the wiper arm or the wiper blade. In the first case, the volume of the wiper arm is increased by the coupling member, whereas, in the second case, it is the volume of the crossbar, so

  in both cases, safe coupling and guidance are assured.

  Preferably, the invention provides for the cross member to form tilting surfaces for a coupling member that is irremovably locked with the wiper arm. This is based on the operating mode of an oscillating bearing. The term "oscillating bearing" is used to refer to a beam or flail support by means of a point or a cutting edge or knife, which makes it possible for the beam to be rotated without obstacle on the bearing With regard to the present invention. , the crossbar of the wiper blade is

comparable to the flail.

  A linkage of the coupling member is particularly ensured when it can be deformed plastically and almost completely envelops the cross member. For the coupling member, it is possible to use

  as material an elastic plastic material.

  The invention will be better understood and other features

  will appear with the following description and accompanying drawings

  FIG. 1 is a view from above in the central zone of the windscreen wiper blade according to the invention; FIG. 2 is a longitudinal section through a portion of

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  the wiper of FIG. 1, which is equipped here with a

  coupling locked in a non-movable manner with the wiper arm

  ice cream; Figures 3 and 4 are different views of this coupling member; Figure 5 is a longitudinal section through a portion of the wiper of Figure 1, which is here provided with a coupling member lockably non-movable with the cross member; and FIG. 6 is a view from above of the windscreen wiper shown in FIG.

figure 5.

  The wiper according to the invention comprises a wiper blade

  ice whose central zone of its main stirrup 10 is shown in Figures 1, 2, 5 and 6 The main stirrup 10 has a substantially U-shaped cross section with two side walls 11 and a back 12 connecting the side walls 1 As shown particularly in FIG. 1, this zone has an opening cut in a region 13 towards the axis of symmetry of the wiper blade and parts of the back have been removed so that, approximately in the center, a crosspiece The cut-out through the back has been made in such a way that, in a partial area of the opening 13, two tabs 15 are formed which, as shown in FIGS. 2 and 5, are folded upwards in such a way that they widen the height of the side walls II and form guide walls for a coupling member 20 or 40 The coupling member 20 or 40 is disposed between the side walls 11 of the windscreen wiper blade 10 and provides the bond

  between the blade 10 and a wiper arm 30 or 50 having an end

  In Figures 2 and 5, all the rear walls are shown uncut while the section planes of the back of the main stirrup 12, the coupling member 20 or 40 and the 30 or 50 wiper arms are hatched The cross member 14 of the main caliper 10 has a rectangular section; its width b (Figure 1) corresponds to about one third of the height of the side walls II (Figures 2 and 5) The crossbar is slightly below the plane of the back 12 of the main stirrup, so that the body of coupling 20 or 40, which, in section, has approximately the shape of a U, can be maintained in a position without clearance with respect to the side walls 11 of the main stirrup with the help of the

tongues 15.

  The coupling member 20 of FIG. 2 is made of a flexible material, preferably a plastic material, and has a body 21 equipped with two legs 22, 23 arranged in parallel. The coupling member 20 is designed so that the body 21 fits exactly on the inner surface 31a of the hook 31 of the wiper arm when it is inserted and that the outer surfaces of the legs 22, 23 lie closely against

  the opposite inner surfaces of the elements 32, 33 of the wiper arm

  The body 21 has a recess 24 receiving the cross member 14, which recess begins at an outer edge of the coupling member 20 in the form of a slot 25 extending inclined towards the center of the body 21 and whose width is slightly greater than the height of the cross member 14 The slot 25 opens into a central region 26 whose section is similar to a circle having a diameter slightly greater than the width of the cross member 14 and two opposite quadrant sections have been The tips 26a of the remaining sections form knife-like articulation surfaces on which the crosspiece 14 is supported. The points 26a therefore represent a pivot bearing and a tilting joint for the cross member 14,

  so that the windshield wiper, in operation, can -

  fit parallel to the different curvatures of a window to be cleaned.

  The mounting of the coupling member on the crosspiece 14 of the main stirrup 10 must thus be carried out so that the coupling member 20 is first held between the side walls 11 of the main stirrup 10, so that the slot 25 of the coupling member 20 is located in the imaginary extension of the

  14, in the direction of the axis of symmetry of the wiper blade

  Then, the coupling member 20 with its slot 25 is pushed on the crosspiece until the thrust movement is limited by the end of the central region 26 If now the coupling member 20 is abandoned, it will turn around the crossbar 14 and

  occupy a position corresponding to its center of gravity.

  To couple the wiper arm 30 to the wiper blade main wiper, the de-coupling member 20 is brought into a position in which its legs 22, 23 are approximately parallel to the back 12 of the wiper arm 30. the main stirrup and insert the main stirrup, equipped with the coupling member 20, inside the hook 31 of the wiper arm As shown in Figure 2, the lower element 33 of the hook 31 the wiper arm has a recess 34 in

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  which engages a pawl 27 of the coupling member As seen particularly in Figures 3 and 4, the pawl 27 is formed on a tongue 28 which is cut in the lower leg 23 of the coupling member 20 tongue 28 can act as a spring around its end facing body 1 and, in the unloaded position, occupies

  a position which extends inclined below an imaginary plane

  If now, as described above, the wiper blade is inserted into the hook 31 of the arm, the tongue 28 is bent upward due to the pressure exerted by the element 33. of the hook until the pawl 27 is above the opening 34 As the pawl 27 has dimensions smaller than those of the opening 34, the pawl engages in it until the tongue 28 rests against the element 33 of the hook of the wiper arm As can be seen in Figure 2, the upper member 32 of the hook 31 of the arm covers the slot 25, so that the wiper blade -glace is prisoner on the wiper arm 30 The extension 28 provided on the tongue 28 facilitates the release of the

  locking link when the wiper blade needs to be changed.

  As is particularly shown in FIGS. 2 and 3, the coupling member 20 has two lateral walls 29 extending beyond the

  22, 23 and the body 21 to guide the hook 31 of wiper arm

  ice laterally, so that thanks to the arrangement according to

  the invention is created a safe coupling that can be easily achieved.

  The coupling member 40 of FIGS. 5 and 6 is made of a relatively soft flexible material, preferably a plastic material. It comprises a solid body 41 which is inserted into the hook-shaped end 51 of a wiper arm. The body 41 is provided with a recess 44 which extends approximately parallel to the axis of curvature of the body 41 and starts from an outer edge of the coupling member 40 in the form of a slot 45 extending in a straight line towards the center of the body 41, the width of this slot being slightly greater than the height of the crosspiece 14 The slot 45 terminates in a central region 46, which, in the unassembled state, has a circular cross section whose diameter is smaller than the width b of the crosspiece 14 During the assembly of the coupling member 40 on the main stirrup 10, which is accomplished in a manner similar to that of the coupling member 20, the central region 46 is enlarged into a causal oval e of the greater width of the crossbar 14, so that the coupling member is locked from

  irremovable way on the crossbar 14.

  As shown in FIG. 5, the body 41 of the coupling member 40 lies closely, by its curved surface 41a, against the curved inner surface 51a of the hook 51 of the wiper arm. The upper surface 42 of the body 41 with the inner surface 52a of the upper member 52 of the arm hook, up to about ten degrees angle α and the lower surface 43 of the body 41, with the inner surface 53a of the lower member 53 of the arm hook, the same angle that opens towards the side of the body 41, not facing the crown of curvature, so that the surfaces 41a, 42 and 43 of the coupling member 40 form surfaces of articulation around which the

  50 wiper arm can rotate.

  The wiper arm 50 is fixed to the outer edge 48a of two tabs 48 which deviate from the side walls 49 of the coupling member 40 The shape of the outer edges 48a is adapted to the outer curvature 51b of the hook 51 of wiper arms, so

  that the wiper arm 50 is trapped in the coupling member 40.

  Since the recess 44 of the coupling member 40 is covered by the element 52 of the wiper arm hook 50, the coupling member 40 can not move away from the wiper blade accidentally, so that, by this arrangement, according to the invention also, is created

  a coupling on which can be achieved easily.

  Although both embodiments show a wiper arm with a hook-shaped end, the invention is not

  not limited to the use of wiper arms of this type.

  an arm with a straight end would also be possible,

  However, what is essential with respect to the present invention is the basic idea of avoiding any complicated shaping work on the hinge arranged on the hinge which can extend laterally to the axis of symmetry of the broom. the wiper blade and arrange the necessary hinge and guide surfaces on a coupling member which can be manufactured in a simple manner, for example by

injection molding.

  Naturally, the embodiments described are not

therefore not limiting of the invention.

Claims (11)

  1 Windscreen wiper for a motor vehicle comprising a main stirrup, having a substantially U-shaped cross-section, two side walls and a back connecting the side walls, and a hinge provided in an open zone at the back of the main stirrup for a wiper arm engaging via a coupling member, the joint and the main yoke being in one piece obtained from a sheet blank, said wiper arm characterized in that the hinge is formed as a flat cross member (14) which is disposed substantially centrally within the   open area (13) of the back (12) of the main stirrup.   Windscreen wiper according to Claim 1, characterized in that the plane of the crossmember is arranged slightly below the plane of the back (12) of the main stirrup.   Windscreen wiper according to one of claims 1 or 2, characterized   characterized in that the cross member (14) forms tilting surfaces for a coupling member (20) which is non-releasably locked with the wiper arm (30).   Windscreen wiper according to one of claims 1 or 2, characterized   in that, on the cross-member (14), is locked non-securely   movable coupling member (40) which forms tion (41 a, 42, 43).   Wiper according to one of claims 3 or 4, characterized   in that the coupling member (20, 40) can be elastically deformed.   and surrounds the crossbar (14) almost entirely.   Wiper according to Claim 5, characterized in that the coupling member (20, 40) is provided with a recess (24, 44) which in the radial direction from its axis has an open edge. , starts from the edge as a slot (25, 45), the width of which in all points is slightly and uniformly greater than the height of the cross-member (14), and opens into a central region (26, 46) which receives   the cross member (14) in the operating position.   Wiper according to Claims 3 and 6, characterized   in that, in the direction of the axis of symmetry of the wiper blade   the central region (26) is slightly wider than the width (b) of the cross member (14) and has hinge surfaces (26a) which, in the operating position, engage the cross member (14) on   its two long sides, each in at least one point.   Windscreen wiper according to claim 7, characterized in that the articulation surfaces (26 a) allow the cross member (14) to be   supported in the manner of a knife.   Windscreen wiper according to Claim 8, characterized in that the coupling member (20) has a holding means (27) for the arm windshield wiper (30).   Wiper according to Claim 9, characterized in that the coupling member (20) has a body (21) with two elastic legs (22, 23)   whose inner surfaces lie closely against the surfaces   the hook (31) of the wiper arm, in the operating position.   Windscreen wiper according to claims 4 and 6, characterized   in that the central region (46) is smaller than the width (b) of the crossmember (14) and is enlarged, in the operating position, in the direction of the axis of symmetry of the windscreen wiper blade. such way   that the cross member (14) is anchored in the central region 46.   Windscreen wiper according to claims 4, 6 and 11, characterized   characterized in that the coupling member (40) has a body (41) whose outer surfaces (42, 43) make an acute angle (a) with the surfaces   interior (52a, 53a) of the wiper arm hook (51).   Windscreen wiper according to Claim 12, characterized in that the coupling member (40) is provided with locking means (48) which are supported on the outer curvature (51b) of the hook (51) of wiper arm.   Windscreen wiper according to one of claims 1   13, characterized in that the coupling member (20, 40) is overlapped by the wiper arm hook (31, 51) in such a way that   elements (32, 52) of the hook cover the slot (25, 45).