The present invention relates to a windscreen wiper device of the flat blade type, particularly for automobiles, comprising an elastic, elongated carrier element, as well as an elongated wiper blade of a flexible material, which can be placed in abutment with a windscreen to be wiped, which wiper blade includes at least one longitudinal groove, in which groove at least one longitudinal strip of the carrier element is disposed, which windscreen wiper device comprises a connecting device for an oscillating arm, wherein the oscillating arm can be pivotally connected to the connecting device about a pivot axis near one end thereof, wherein the connecting device is connected to the flexible material of the wiper blade by at least one pin, wherein the pin cooperates with a recess provided along an exterior edge of the longitudinal strip in order to limit any movement of the wiper blade in longitudinal direction thereof relative to the longitudinal strip at the location of the interconnection of the connecting device and the wiper blade, wherein the connecting device has a substantially U-shaped cross-section, wherein free ends of legs of the U-shaped cross-section extend inwardly so as to form grooves for receiving longitudinal sides of the wiper blade, and wherein at least one of the legs is provided with a hole for receiving the pin. Particularly, the oscillating arm can be pivotally connected to the connecting device with the interposition of a joint part. More in particular, the wiper blade comprises a spoiler at a side thereof facing away from the windscreen to be wiped, wherein the wiper blade and the spoiler are preferably made in one piece through extrusion, the longitudinal groove is preferably a central longitudinal groove accommodating the longitudinal strip, the longitudinal strip is also called a “flexor”, while the connecting device is also indicated as a “connector”. In the framework of the present invention the connector is preferably made in one piece, also called a “one piece connector”.
Such a windscreen wiper device is known from international patent publication no. WO 2012/139635 of the same Applicant which is hereby incorporated by reference. This prior art windscreen wiper device is designed as a so-called “flat blade” or “yokeless blade”, wherein no use is made of several yokes pivotally connected to each other, but wherein the wiper blade is biassed by the carrier element, as a result of which it exhibits a specific curvature. The spoiler is also called an “air deflector”. In the international patent publication advantageously at least two of such pins are provided on opposite sides of the longitudinal strip, wherein the pins are preferably located opposite one another. In the international patent publication the connecting device is particularly connected to the flexible material of the wiper blade by the at least one pin being of a first type and at least one pin of a second type, wherein the pin of the second type is cutting the wiper blade at the location of the interconnection of the connecting device and the wipe blade in order to block any lateral movement of longitudinal strip at the location of the interconnection of the connecting device and the wiper blade. In other words, the pin of the first type ensures that the wiper blade and the longitudinal strip are not allowed to mutually move under the connecting device, but particularly in all other areas along the wiper blade a slight movement thereof is made possible in order to allow the wiper blade to follow any curvature of the windscreen to be wiped. It is this interaction between the pin of the first type and the wiper blade that elastomerie material (i.e. usually rubber) of the wiper blade and material of the longitudinal strip (i.e. usually steel) are forced to engage with each other in a locking manner when the connecting device is finally mounted onto the wiper blade, all at the location under the connecting device. the pin of the first type is mounted inside the recess by stamping the pin of the first type through the flexible material of the wiper blade and inside the recess. the pin of the second type ensures that the so-called “fishtailing phenomenon” is avoided at all times. the wiper blade at the location outside the connecting device would normally suffer from this “fishtailing phenomenon”, wherein the wiper blade on opposite sides of the connecting device vibrates in an uncontrollable manner parallel to the windscreen to be wiped. Obviously, the “fishtailing phenomenon” results in deteriorated wiping properties, with all negative consequences involved, particularly at high speeds. the cut by the pin of the second type is realized at the time of mounting the connecting device onto the wiper blade during assembly of all relevant parts of the wiper blade, wherein the cut is particularly effected in a side region of the wiper blade, without having any influence on a bottom region thereof (i.e. containing a wiping lip of the wiper blade). Consequently, wiping properties of the wiper blade are not adversely affected.
The object of the invention is to provide an improved windscreen wiper device. More in particular, the present invention aims to reduce stress forces at the location of the hole of the connecting device, as a result of introducing the pin inside the hole by three, in order to prevent fractures in the connecting device due to these stress forces. The fractures may negatively influence the retention of the connecting device (and therefore of the wiper blade relative to the oscillating arm) onto the wiper blade, as the pin may get loose due to the fractures. Hence, the present invention has the object to reduce these stress forces and to improve retention of the pin inside the hole, also after any heat treatment of the wiper blade.
In order to accomplish that objective, a windscreen wiper device of the type referred to in the introduction is characterized according to the invention in that the pin is glued to an inner wall of the hole or the pin is form-locked (German: “Formschluss”) inside the hole. Hence, the pin is connected inside the hole of the connecting device in a stress-free manner, so that the pin is not force-locked to the connecting device. Stress forces are now considerably reduced either by gluing or by form-locking (or “positive locking” or “having a positive fit”) the pin inside the hole of the connecting device.
the pin particularly is a separate element, i.e. a single constructional element extending in mounted position at least substantially perpendicular to the windscreen to be wiped.
It is noted that the present invention is not restricted to the use of only one longitudinal strip forming the elastic carrier element that is particularly located in a central longitudinal groove of the wiper blade. Instead, the carrier element may also comprise two longitudinal strips, wherein the strips are disposed in opposite longitudinal grooves of the wiper blade, the groove (s) may be closed at one outer end.
Further, it is noted that in the invention use is made of a mounting head fixed for rotation to a shaft, wherein the shaft is rotatable alternately in a clockwise and in a counter-clockwise sense carrying the mounting head into rotation. Thus, in turn the mounting head draws the connecting device into rotation and thereby moves the wiper blade. In the alternative, the mounting head is fixed for translation to a carriage, wherein the carriage can be translated alternately in a one linear direction and in another counter linear direction carrying the mounting head into translation. The present invention can therefore be used for circular or linear movement of the mounting head.
In a preferred embodiment of a windscreen wiper device in accordance with the present invention the pin and the inner wall of the hole are provided with mutually cooperating snapping means for form-locking the pin inside the hole. In other words, snapping the pin inside the hole of the connecting device in order to obtain a form-locked interconnection there between is realized either by a protrusion extending sidewardly and outwardly from the inner wall of the hole and snapping behind an edge of the pin or by a protrusion extending sidewardly and outwardly from the pin and snapping behind an edge of the inner wall of the hole.
In another preferred embodiment of a windscreen wiper device according to the present invention the pin comprises an elongate web and at least one shoulder near an outer end of the web in use facing away from a windscreen to be wiped, wherein the shoulder is snapped behind an edge of the inner wall of the hole for form-locking the pin inside the hole. Particularly, the shoulder forms a flange on the outer end of the web.
In another preferred embodiment of a windscreen wiper device in accordance with the present invention the web and the flange are made in one piece, preferably one piece of plastic material.
In another preferred embodiment of a windscreen wiper device according to the present invention the pin comprises two shoulders each located near an outer end of the web. In other words, the one shoulder is located at an outer end of the pin in use facing away from a windscreen to be wiped, whereas the other shoulder is located at an outer end of the pin in use facing toward a windscreen to be wiped. the shoulders preferably each form a flange being in one piece with the web of the pin.
In another preferred embodiment of a windscreen wiper device in accordance with the present invention the pin is deformed near its outer ends so as to form rivets for form locking the pin inside the hole through a rivet connection. Hence, a rivet is formed at an outer end of the pin in use facing away from a windscreen to be wiped, as well as at an outer end of the pin in use facing toward a windscreen to be wiped. Particularly, a special tool is used to deform both outer ends.
In another preferred embodiment of a windscreen wiper device according to the present invention wherein the connecting device is connected to the flexible material of the wiper blade by the at least one pin being of a first type and at least one pin of a second type, wherein the pin of the second type is slightly cutting the wiper blade at the location of the interconnection of the connecting device and the wiper blade in order to block any lateral movement of longitudinal strip at the location of the interconnection of the connecting device and the wiper blade. Preferably, the pin of the first type allows movement of the wiper blade in longitudinal direction thereof relative to the longitudinal strip outside the location of the interconnection of the connecting device and the wiper blade. Hence, it is made possible to allow the wiper blade to follow any curvature of the windscreen to be wiped. Preferably, the pin of the second type is slightly cutting the wiper blade in the form of a C. Preferably, the pin of the second type exerts a transverse force on the longitudinal strip, in order to block any lateral movement of longitudinal strip at the location of the interconnection of the connecting device and the wiper blade. Preferably, no other force than the transverse force is exerted by the pin of the second type.
In a manner similar to the pin of the first type, the pin of the second type is also glued to the inner wall of a hole provided in at least one of the legs of the U-shaped cross-section of the connecting device or the pin of the second type is also form-locked inside the hole, i.e. either by snapping or by riveting in a manner as described above in relation to the pin of the first type.
the pin of the first type and the pin of the second type are preferably separate elements, i.e. single constructional elements extending in mounted position at least substantially perpendicular to the windscreen to be wiped.
In another preferred embodiment of a windscreen wiper device in accordance with the present invention the connecting device is connected to the flexible material of the wiper blade by one pin of the first type interconnecting the connecting device and the wiper blade near the middle longitudinal plane of the connecting device perpendicular to the windscreen to be wiped and by two pairs of opposite pins of the second type interconnecting the connecting device and the wiper blade near the outer ends of the connecting device. In the alternative, the connecting device is connected to the flexible material of the wiper blade by one pair of opposite pins of the first type interconnecting the connecting device and the wiper blade near the middle longitudinal plane of the connecting device perpendicular to the windscreen to be wiped and by two pairs of opposite pins of the second type interconnecting the connecting device and the wiper blade near the outer ends of the connecting device. In the alternative, the connecting device is connected to the flexible material of the wiper blade by one pair of opposite pins of the first type and by one pair of opposite pins of the second type interconnecting the connecting device and the wiper blade near the outer ends of the connecting device.
In the alternative, the connecting device is connected to the flexible material of the wiper blade by two pairs of opposite pins of the first type interconnecting the connecting device and the wiper blade near the outer ends of the connecting device.
The present invention also refers to a method for manufacturing a windscreen wiper device of the flat blade type, particularly for automobiles, comprising an elastic, elongated carrier element, as well as an elongated wiper blade of a flexible material, which can be placed in abutment with a windscreen to be wiped, which wiper blade includes at least one longitudinal groove, in which groove at least one longitudinal strip of the carrier element is disposed, which windscreen wiper device comprises a connecting device for an oscillating arm, wherein the oscillating arm can be pivotally connected to the connecting device about a pivot axis near one end thereof, wherein first a recess is cut along an exterior edge of the longitudinal strip, wherein the connecting device is subsequently mounted onto the wiper blade, wherein the longitudinal strip is subsequently inserted inside the groove, whereinafter at least one pin is used, the pin cooperating with the recess provided along the exterior edge of the longitudinal strip in order to block any movement of the wiper blade in longitudinal direction thereof relative to the longitudinal strip at the location of the interconnection of the connecting device and the wiper blade, characterized by gluing the pin to an inner wall of the hole or form-locking the pin inside the hole.
In the present invention the connecting device is preferably pivotally connected to the oscillating arm with the interposition of a joint part, wherein the joint part is detachably connected to the connecting device by engaging protrusions of the connecting device, at the location of the pivot axis, in recesses provided in the joint part. This is preferably, realized through a snapping or clipping operation. the joint part has preferably an at least substantially U-shaped cross-section at the location of its connection to the connecting device, wherein the joint part is provided with a recess provided coaxially with the pivot axis. In particular, the protrusions extend outwards on either side of the connecting device and are preferably cylindrical in shape. In the alternative, the protrusions are spherical or frusto-conical in shape. the protrusions that function as bearing surfaces are thus paced far apart, so that forces exerted thereon will be relatively low, in yet another preferred variant the joint part is provided with co-axial through holes in legs of the U-shaped cross-section thereof, wherein a pivot pin is inserted in the through holes. Preferably, the protrusions are provided with co-axial through holes. Accordingly, the wiper blade may then be connected to the oscillating arm on the basis of a so-called “sidelock system”, The oscillating arm is provided with a joint pin or a pivot pin to be inserted in the co-axial through holes, the pivot pin protrudes in a direction towards the wiper blade and has a pivot axis extending in a direction of the oscillating movement of the oscillating arm. Preferably, the joint part comprises at least one resilient tongue engaging in a correspondingly shaped hole provided in a base of a U-shaped cross-section of the oscillating arm, and wherein the resilient tongue is rotatable along a hinge axis between an outward position retaining the wiper blade onto the oscillating arm and an inward position releasing the wiper blade from the oscillating arm. Accordingly, the wiper blade may then be connected to the oscillating arm on the basis of a so-called “toplock system” on the basis of a bayonet connection. In order to connect the wiper blade onto the oscillating arm, the resilient tongue is initially pushed in against a spring force—as if it were a push button—and then allowed to spring back into the hole provided in the oscillating arm, thus snapping, that is clipping the resilient tongue into the hole. By subsequently pushing in again the resilient tongue against the spring force, the wiper blade may be released from the oscillating arm.
The invention will now be explained more in detail with reference to figures illustrated in a drawing, wherein
Although not shown in
With reference to
The longitudinal strip 4, as shown in
Referring to
Referring to
Referring to
The invention is not restricted to the variants shown in the drawing, but it also extends to other preferred embodiments that fall within the scope of the appended claims.
Filing Document | Filing Date | Country | Kind |
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PCT/EP2015/079122 | 12/9/2015 | WO | 00 |