FR2462312A1 - ICE WIPER COMPONENT COMPRISING AN ICE WIPER ARM SUBJECT TO THE ACTION OF A COMPRESSION SPRING - Google Patents

Abstract

ARTICULATION OF A WIPER ARM ON ITS DRIVE AXLE. THE WIPER ELEMENT ACCORDING TO THE INVENTION INCLUDES A WIPER ARM AND A HEAD FIXED ON THE DRIVE SHAFT, A COMPRESSION SPRING BEING INTERPOSED BETWEEN A PART LINKED TO THE HEAD AND A PART LINKED TO THE DRIVE AXLE. ARM, THIS ORGAN BEING ARTICULATED ON THE HEAD AND BEING CHARACTERIZED BY THE FACT THAT IT CONSISTS OF A PLATE PERPENDICULAR TO THE HINGE AXLE, THE AID PLATE INCLUDING A RECESS FOR HOUSING THE SPRING AND BEING CONNECTED TO THE CRANKCASE BY A LINK SLIDING. USEFUL FOR INDUSTRIAL MOTOR VEHICLE WIPERS.

Description

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  WINDSHIELD WIPER COMPRISING A WINDSCREEN WIPER ARM

  IMPROVED IN COMPRESSION SPRING

  The present invention relates to windscreen wipers,

  especially for motor vehicles.

  It is known that glazed surfaces subjected to asper-

  must, when it is desired to maintain a good

  through them, be subject to the action of windshield wipers

  which usually have an alternate scanning motion. Lake-

  the wipers on the surface to be swept is carried out

  this to a wiper blade, which is entrained by a mechanism

  motor by means of a windshield wiper

  mechanical connection between the wiper blade and the mechanism

  me training. More specifically, the entry mechanism

  generally includes a rotary axis on which is

  wheat an assembly head which is articulated, by means of a cylindrical articulation, relative to a casing integral with a wiper arm. An elastic system is interposed between the casing and the aforementioned head so as to maintain, during the operation of the wiper, an elastic support

  the wiper blade on the surface to be swept.

  The elastic system, which makes it possible to maintain

  lai wiper against the windshield, uses, in general, a helicoldal spring that can work either in traction or in compression. The use of a spring working in

  traction has many disadvantages, the most important of which

  so much so that if a tension spring providing an elastic support of wiper on the windshield breaks,

  the windscreen wiper is no longer supported on the windshield and its effi-

  cacity becomes nil. On the contrary, when using a

  fate acting in compression, such a spring is always mounted on an internal anti-buckling guide and if one of these turns comes to break, we cancel the effect of the turn considered but we maintain the effect of all other turns, of so that the spring loses only a small part of its efficiency and,

  that the windshield wiper can continue to operate satisfactorily

  tory. We are therefore led to prefer the use of a

  compression wiper for supporting the windshield wipers on their

associated breeze.

  It is known, moreover, that it is necessary

  see manually cleaning the windshield, which is associated

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  the wiper in question, to have the possibility to release the wiper with respect to the windshield by rotating it

  around the joint, which connects the housing and the head assembly

  on the drive shaft. This pivoting takes place under the action of a couple applied manually by the user.

  to overcome the opposite torque generated by the spring, which

  place the wiper on the windshield. It is clear that it is preferable to provide a stop to limit the release movement of the wiper arm relative to the windshield; indeed, if no stop is provided, the limitation of the disengagement movement is carried out only by pressing the casing (or a possible cap protecting the assembly head of the windscreen wiper) against the bodywork * or an element related to the bodywork and such a support

  is likely to cause either a deterioration of the

  ter or said cap, a deterioration of the coach-

  a simultaneous deterioration of the two elements in

  pui. It has therefore been proposed to conform, on the one hand,

  maintaining the wiper spring operating in compres-

  sion and secondly, the assembly head of the wiper, so that, by cooperation, it obtains a stop limiting the stroke of the wiper: this type of embodiment is, for example, described in German Patent 1,217,229 and in the

  French patent 2,239,101. In all cases, the organ of maintenance

  the compression spring is an organ which penetrates completely

  part of the spring, so that, necessarily, its size is relatively

  than its mechanical strength. However, the clearance effort

  that the wiper is all the more important as the spring

  windshield wiper is stronger: the more the spring exerts

  it is an important support force, plus the action of the user.

  on the windscreen wiper, when it reaches the end of the clearing stroke, may be significant. Since there is a tendency to increase the spring force to prevent the lifting of the wiper blades due to the air flow during a displacement

  at high speed, and given that, on the other hand,

  the wiper springs develop a considerable force, it is frequent that at the end of clearing stroke, the holding member which abuts against the assembly head of the wiper undergoes a considerable bending force. In view of the fact that, in the state of the art, these members always have a reduced dimension, it is clear that they can not withstand such forces bending and that there is frequently deterioration by deformation. These deteriorations are frequent, especially

  particular, on industrial vehicles where users take

  sometimes press the wiper housings in the open position to perform various operations, for example,

for cleaning the windshields.

  The present invention aims to avoid such

  deterioration by deformation of the retention member of the

  compression wiper, a device by which the limit stop of the release movement is obtained

  wiper relative to the windshield. The state of the art

  nique, represented by French Patent 2,239,101, proposes to achieve the stop by cooperation of the assembly head with the anti-buckling guide of the windscreen wiper spring, which guide is

  likely to move relative to the housing.

  According to the invention, it is proposed to dissociate the anti-flam-

  spring and the piece, which is intended to ensure the stop

  end of clearing stroke of the windscreen wiper, and

  poses, in addition, to arrange this piece on either side of the spring, so as to obtain considerable resistance to the

  bending, which avoids any deterioration during use.

  The subject of the present invention is accordingly

  the new industrial product constituted by an element of

  soot-ice intended to ensure the connection between the output shaft of a drive mechanism and the armature of a wiper, said element comprising on the one hand a head which is fixed on the output shaft aforesaid, on the other hand, an arm of which

  end carries a connecting means with the wiper armature

  aforementioned ice and the other end of which is

  connected to the aforementioned head via a housing, and finally, a cylindrical articulation formed between the head and the housing mentioned above, a helical compression spring

  taking support, on the one hand, on an organ linked to the precise head

  an axis parallel to that of the articulation of the head on the housing and on the other hand, on a solidarized part of the

  housing said member bearing a stop which limits, by cooperation

  ration with the head, the stroke of the release of the wiper

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  relative to the surface to be swept and being connected to the housing by a connection allowing free sliding, characterized in that, the aforementioned member is a plate whose plane is substantially perpendicular to its axis of articulation with the head and the central zone has a recess permitting

  both to house the spring, the link which ensures a free

  said plate with respect to the housing being provided with means which support the action of the spring and prevent its

  moving perpendicular to the plate.

  In a preferred embodiment, the plate comprises

  te, in the area where one end of the spring bears on it, a means of centering the spring relative to the plate; it can advantageously be provided that the centering means is a projection constituting a relief in the recess where is housed the

  spring; the recess, where the spring is housed, is rectangular

  re, its length being at least equal to the maximum length of the spring in the free state and its width to the diameter of the spring; the housing has a U-shaped cross-section, the two wings of the U being connected by a web and carrying the axis of articulation of the head relative to the housing in the vicinity of their longitudinal edges, which are opposed to the core; in the case of such a housing, the connection which allows a free sliding of the plate relative to the housing is advantageously constituted

  a slot made in a perpendicular square return

  to the housing core, said slot being substantially equidistant

  aunt of the two wings of the casing and being crossed by the

  than; The above-mentioned return angle is advantageously

  killed by the curved end of the wiper arm, which is

  integral with the housing; the means that support the action of the

  fate and which are associated with the sliding connection of the

  only in relation to the casing, are constituted by a plate with a U-shaped section, whose core receives the action of the spring,

  on the square return of the housing and includes a slot

  the free sliding of the plate and whose wings are substantially parallel to the wings of the housing; the wings of the

  platinum are spaced a substantially equal distance or

  significantly greater than the outside diameter of the spring; the assembly head comprises a stirrup between the two wings of which

  insert the end of the plate, which is opposite to the

  its sliding with the housing, a hinge pin to -----

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  passing through the plate-stirrup assembly to constitute an article

  cylindrical culation; the edge of the plate, which is on the

  sinage of the articulation of the plate relative to the head, is, by its two ends, two stops limiting the angular movement of the head about its axis articula-

  in relation to the crankcase; an anti-buckling guide is available

  se inside the spring; the aforementioned anti-buckling guide is a cylindrical rod having a substantially equal diameter

to the inner diameter of the spring.

  To better understand the object of the invention,

  we will now describe, as a purely illustrative example

  process and not limiting, an embodiment shown on

the attached drawing.

  In this drawing: - Figure 1 shows the longitudinal section of the portion of a wiper element according to the invention, which is in the vicinity of the hinge of the housing on the head, the head being disposed relative to at the crankcase in the position

  o it is when the wiper arm is in position

  operation, that is to say when the wiper blade

  ice is supported on the windshield associated with the wiper.

  FIG. 2 represents a view from below according to II-

  II of Figure 1; FIG. 3 represents the wiper element of FIG. 1 in the extreme position of the head relative to

  to the casing, which corresponds to the complete disengagement of the wiper.

  ice relative to the windshield; FIG. 4 represents the wiper element of

  FIG. 1, when the head occupies with respect to the casing the

  its extraneous position of its angular clearance allows, this position being in fact never reached, since

  the wiper element is mounted on a vehicle, but

  corresponding to a limitation of the angular deflection of the t8-

  when the wiper element is stored as a part of

spare.

  Referring to the drawing, we can see that the element of

  soot-ice according to the invention comprises a wiper arm 1, which is connected to an assembly head 2 via

  a crankcase designated by 3 as a whole. Arm 1 is so-

  lidarized housing 3 by means of two rivets 4. Beyond the

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  riveting zone of the arm 1 on the casing 3, the arm 1 is

  bent to 90 to constitute a return to square 5. In this

  back to square, there is a slot 6 arranged in the square

  median of the metal plate, which constitutes the arm 1.

  The casing 3 has a U-shaped cross section: it is

  consisting of two substantially parallel wings 3a connected

  be they by a & 3b. The wings 3> of the housing 3 support

  the hinge axis 7 of the head 2 relative to the housing.

  The axis 7 is arranged perpendicularly to the wings 3a, in the area of these wings which is furthest from the one hand of the arm 1 and the other part of the core 3h. The head 2 has a sleeve

  8 provided with a bore, which is traversed by the axis 7. The axis 7 com

  carries at one of its ends a hemispherical head 7a and is crushed by crimping at its other end 7b to ensure its maintenance in position. In the central zone of the sleeve 8

  is connected a stirrup consisting of two parallel wings 9

  which one of the ends of a plate is arranged

  having a generally rectangular general shape. Las-

  appearance between the plate 10 and the two wings 9-is realized

  by means of an axis 11 which constitutes a cylindrical articulation

  between the plate 10 and the head 2. The head 2 comprises an

  wise 2a intended for the installation of the head on the tree of

  tracing (not shown) of the wiper element, the shaft

  training which is moved in alternative rotation by a mechanism

  appropriate Fixation of the head 2 on its axis of

  nementis achieved by means of a nut, which is screwed end of axis. As is clearly visible in the drawing, the axis l1 and the bore 2a are arranged on either side of the plane passing through.

  by the axis 7 and perpendicular to the core 3b.

  The core 3b is limited, from the side of the axis 7, by a boundary

  transverse hard 3d disposed approximately at the right of

  axis 11. As a result, the cylindrical joints cor-

  corresponding to axes 7 and 11 are not covered by the

  b. For the purpose of aesthetics and protection, we can associate

  to the wiper element according to the invention a cap

  (not shown in the drawing), it being understood that

  chon must allow the clearance of the head 2 relative to the casing 3 and the establishment of the nut assemulage, which fixes

  the head 2 on its drive shaft.

  The plate 10 has one of its ends articulated around

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  of the axis 11 and its other end is engaged in the slot 6 of the square return 5 of the arm 1. The plate 10 comprises, in its central zone, a rectangular recess 12, whose major axis is arranged parallel to the long side of the plate 10, which is itself substantially rectangular as has been specified above. On the small side of the recess 12, which is the closest to the axis 11, there is provided a protrusion 13 consisting of a triangular point, which forms a relief in the recess 12. of course 12, we have

  a helical spring 14 working in compression. The length

  the recess 12 is substantially equal to the length of the spring 14 in the state of rest; the width of the recess 12 is

  substantially equal to the outer diameter of the spring 14. The

  13 allows to achieve the centering of the spring 14 in the recess-

  12; but it is clear that at the end of the recess

  12, which is opposed to the projection 13, the spring is not

  held perpendicular to the plane of the plate 10. The end

  spring 14, which is not centered on the projection 13, becomes

  on the core of a plate 15, which has a U-shaped cross section: the plate 15 has two parallel wings 15a interconnected by a lug 15b disposed perpendicularly to the plate 10, the plate 10 passes through the core 15b grace to a slot c made in the core 15b .. The core 15b is pushed in abutment against the return square 5 by the spring 14. The wings 15a

  of the plate 15 are spaced a distance substantially equal to

  the outer diameter of the spring 14, so that they

  position said spring 14 in the direction perpendicular to

  to the plate 10. The spring 14 is working on compres-

  sion and develops a force between the return to square 5 and the

  xe of articulation 11; this force creates a couple which, by supposing

  the fixed head 2 since secured to the drive shaft, tends to cause a rotation of the arm 1 in the direction indicated by the arrow F in Figure 1. This couple is that which allows to apply the wiper blade on the windshield during operation of the windshield wiper. It tends to bring the casing 1 and the plate 10 into the position, which is represented in FIG. 4, but because of the presence of the windshield, this

  position is never reached in operation when the

  windscreen wiper is mounted on a vehicle. In the position of FIG. 4, the zone 10a of the edge of the plate 10 which

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  is in the vicinity of the axis 11 therefore constitutes an abutment limiting the angular displacement of the head 2 relative to the casing 3, this area coming to bear against the sleeve 8 of the head 2. The profile adopted for the zone 11a depends on of course, the limitation of angular displacement that is desired. - When the user wishes to release the windshield wiper relative to the windshield, it exerts on the arm 1 a torque tending to rotate the housing 3 about the axis 7 in the

  the opposite direction of that defined by the arrow F in Figure 1.

  In this movement, it causes a change in the relative position of the force applied by the spring on the housing vis-à-vis the axis 7; when the support of the force comes to rest on the axis 7, one is in equilibrium; Beyond

  this position, the spring 14 tends to push the wiper arm

  ice in the opposite direction of arrow F, that is to say that

  the action of the spring is added to the action of the user.

  This rotation of clearance of the arm 1 relative to the head 2

  continues until zone 10b of the border of the

  that 10, which is in the vicinity of the axis 11, comes into abutment

  be the sleeve 8 of the head 2. This zone lOb therefore constitutes

  a second stop to limit the relative angular deflection

crank case 3 and head 2.

  It is clear that when the user clears the

  soot-ice relative to the windshield and manages to achieve the abutment of the edge lOb against the sleeve 8, it occurs on the part 10 a bending effort all the more considerable that the action of the user is more brutal and that the spring force, which at that time is added to that of the user, is greater. However, on the one hand, users are often

  rather uncomfortable and, on the other hand, the springs of

  soot-ice used are often very powerful to avoid the lifting of the wiper by the air streams at high vehicle speeds; therefore, at the end of the wiper release action, the bending force

  35. exerted on the piece 10 is considerable. Thanks to the

  According to the invention, the piece 10 has an important resistance

  bending, because it was given a great height in the

  on both sides of the jurisdiction 14. Moreover, this

  this being external to the spring 14 can without any difficulty,

  have increased thickness if necessary. We ----

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  therefore notes that this structure makes it possible to avoid any

  bending during the release of the wiper arm

compared to the windshield.

  To avoid buckling of the spring 14, there is inside this spring a guide consisting of a rod 16 of

  circular section, said rod having a very slight diameter

  less than the inside diameter of the spring 14. During the relative movement of the casing 3 with respect to the head 2, the

  plate 10 moves relative to the housing 3 and slides free-

  Through these movements, the inclination of the average line of the plate 10, that is, the axis of the spring 14 relative to the kme 3b of the case 3 varies slightly, as

  it is clearly visible in FIGS. 1, 3 and 4.

  The wiper element according to the invention is of a

  simple realization because parts 10 and 15 can be obtained

  bare by simple die-casting. In addition, the assembly of this wiper element is performed without any difficulty: first assembled by riveting the arm 1 and the housing 3; then assemble the head 2 and the plate 10 by means of the axis 11; is then placed in the recess 12, the spring 14 and

  its anti-buckling guide 16 and one has at the end of the res-

  14 fate that does not come on the projection 13, the plate 15 by sliding the plate 10 in the tent 15c. The free end of the plate 10 is then engaged in the slot 6 and the spring 14 is compressed by pushing on the shaft 11 until the bore of the sleeve 8 comes into contact with the orifices provided in the wings. 3 for the axis 7; we then set up axis 7,

  which ensures the solidarity of the whole.

  The assembly and manufacture of the wiper element

  according to the invention being simple, said element is of a

  cost price, although it avoids all

  deterioration by deformation, even in case of brutal action

  users in the release movement of the wiper

ice compared to the windshield.

  It is understood that the embodiment below

  described above is in no way limiting and may give rise to any desirable modifications, without departing from the framework

of the invention.

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Claims (11)

  1 - Windscreen wiper element intended to ensure the connection   sound between the output shaft of a drive mechanism and the armature of a windscreen wiper, said element comprising, on the one hand, a head which is fixed on the aforementioned output shaft, on the other hand , an arm'dont an end carries a connection means with the aforementioned wiper armature and the other end is mechanically connected to the aforementioned head via a housing, and finally a cylindrical joint arranged between the head and the aforementioned casing, a helical compression spring bearing on the one hand, on a member linked to the aforementioned head by an axis parallel to that of the articulation of the head on the casing and secondly, on a part secured to the casing, said member carrying a stop which limits, in cooperation with the head, the race   the release of the wiper relative to the surface to be   layer and being connected to the housing by a connection allowing a   free sliding, characterized by the fact that   cited is a plate whose plane is substantially perpendicular   to its axis of articulation with the head and whose central zone comprises a recess for accommodating the spring, the connection which ensures a free sliding of said plate relative to the housing being provided with means that support   the action of the spring and prevent its perpendicular movement. stretching to the plate.   2 - wiper element according to claim i characterized in that the plate comprises, in the area where one end of the spring bears against it, a means of   centering of the spring with respect to the plate.   3 - Wiper element according to claim 2   characterized by the fact that the centering means is a   is a relief in the recess where is housed the res- fate.   4 - Wiper element according to one of the claims   1 to 3, characterized in that the recess, where the spring is housed, is rectangular, its length being at least equal to the maximum length of the spring in the free state and its width to the diameter of the spring.   Wiper element according to one of Claims 1 to 4, characterized in that the casing has a U-shaped cross-section, the two wings of the U being connected to one another.   by a soul and carrying the axis of articulation of the head by   crankcase near their longitudinal edges, who are opposed to the soul. -   6 - Windscreen wiper element according to Claim 5   characterized by the fact that the connection which allows a free   lissement of the plate relative to the housing is constituted   a slot made in a perpendicular square return   to the housing core, said slot being substantially equidistant   aunt of the two wings of the housing and being traversed by the plate.   7 - Wiper element according to claim 6 characterized in that the return angle is constituted   by the curved end of the wiper arm, which is the casing.   8 - Wiper element according to one of the claims   6 or 7, characterized by the fact that the means, which   the action of the spring and are associated with the   smoothing of the plate relative to the housing, are constituted   a U-section platinum, whose soul receives the action of the res-   fate, is based on the return squared of the housing and has a slot ensuring the free sliding of the plate and of which   the wings are substantially parallel to the wings of the housing.   9 - Windscreen wiper element according to claim 8,   characterized in that the wings of the plate are spaced a distance substantially equal to or slightly greater than outer diameter of the spring.   - Wiper element according to one of the claims   1 to 9 characterized by the fact that the assembly head   has a stirrup between the two wings of which the   of the plate, which is opposed to the sliding connection with the housing, an axis passing through the plate-stirrup assembly for   constitute a cylindrical articulation.   11 - Wiper element according to one of the claims   1 to 10, characterized in that the border of the   that, which is in the vicinity of the plate joint by   relation to the head, constitutes at both ends two   limiting the angular movement of the head around its   articulation axis relative to the housing.   12 - Wiper element according to one of the claims   1 to 1 characterized by the fact that an anti-buckling guide 1 2462312   is arranged inside the spring. -   13 - Windscreen wiper element according to claim 12   characterized by the fact that the anti-buckling guide is a ti-   cylindrical ge having a diameter substantially equal to the inner diameter of the spring. -