Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
  • B60S1/00—Cleaning of vehicles
  • B60S1/02—Cleaning windscreens, windows or optical devices
  • B60S1/04—Wipers or the like, e.g. scrapers
  • B60S1/32—Wipers or the like, e.g. scrapers characterised by constructional features of wiper blade arms or blades
  • B60S1/34—Wiper arms; Mountings therefor
  • B60S1/3463—Means to press blade onto screen
  • B60S1/3465—Means to press blade onto screen with coil springs
  • B60S1/3468—Mountings therefor
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
  • B60S1/00—Cleaning of vehicles
  • B60S1/02—Cleaning windscreens, windows or optical devices
  • B60S1/04—Wipers or the like, e.g. scrapers
  • B60S1/32—Wipers or the like, e.g. scrapers characterised by constructional features of wiper blade arms or blades
  • B60S1/34—Wiper arms; Mountings therefor

Definitions

• the present invention relates to windscreen wipers, in particular for motor vehicles.
• the glazed surfaces subjected to spraying must, when it is desired to maintain good visibility through them, to be subjected to the action of wipers which generally have an alternative sweeping movement.
• the wiper action on the surface to be swept is effected by a wiper blade, which is driven by a motor mechanism by means of a wiper element ensuring the mechanical connection between the blade wiper and the drive mechanism.
• the entrainment mechanism generally comprises a rotary axis on which is assembled an assembly head which is articulated, by means of a cylindrical articulation, relative to a casing secured to a wiper arm. ice cream.
• An elastic system is interposed between the above-mentioned casing and head so as to maintain, during the operation of the wiper, an elastic support of the wiper blade on the surface to be swept.
• the elastic system which keeps the wiper blade against the windshield, generally uses a helical spring which can work either in traction or in compression.
• the use of a spring working in traction has many drawbacks, the most important of which is that if a tension spring providing elastic support for the wiper on the windshield breaks, the wiper n 'is pressed more on the windshield and its effectiveness becomes zero.
• a spring acting in compression such a spring is always mounted on an internal anti-buckling guide and if one of these turns breaks, the effect of the considered turn is canceled out but the effect of all the other turns, so that the spring loses only a small part of its effectiveness and, that the wiper can continue to function satisfactorily.
• the release force applied to the wiper is greater the stronger the wiper spring: in fact, the more the spring exerts a significant bearing force, the more the action of the user on the wiper, when it reaches the end of the relief stroke, may be significant. Since there is a tendency to increase the force of the spring to avoid the lifting of the wiper blades due to the air streams when moving at high speed and given, moreover, that, on industrial vehicles, the wiper springs develop a considerable force, it is frequent that at the end of the relief stroke, the holding member which abuts in abutment against the assembly head of the wiper undergoes a considerable bending force.
• the object of the present invention is to avoid such deterioration by deformation of the member for holding the compression spring of a wiper, a member by which the end stop of the wiper release movement is obtained. -glass compared to the windshield.
• the state of the art represented by French patent 2,239,101, proposes making the stop by cooperation of the assembly head with the anti-buckling guide of the wiper spring, a guide which is capable of relative movement with respect to the housing. According to the invention, it is proposed to dissociate the anti-buckling guide of the spring and the part, which aims to ensure the end stop of the wiper release stroke, and it is further proposed to arrange this part on either side of the spring, so as to obtain considerable resistance to bending, which prevents any deterioration during use.
• the present invention therefore relates to the new industrial product which constitutes a wiper element intended to ensure the connection between the output axis of a drive mechanism and the frame of a wiper. window, said element comprising on the one hand a head coming to be fixed on the aforementioned output shaft, on the other hand, an arm of which one end carries a means of connection with the abovementioned wiper frame and of which the other end is mechanically connected to the aforementioned head by means of a casing, and finally, a cylindrical articulation formed 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 housing and on the other hand, on a part integral with the housing, said member carrying a stop which limits, by cooperation with the head, the travel of the release of the wiper with respect to the surface to be swept and being connected to the casing by a connection allowing free sliding, characterized in that
• the plate comprises, in the zone where one end of the spring bears on it, a means for centering the spring relative to the plate; one can advantageously provide that the centering means is a projection constituting a relief in the recess where the spring is housed; 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; the casing has a U-shaped cross section, the two wings of the U being connected by a core and carrying the axis of articulation of the head relative to the casing in the vicinity of their longitudinal edges, which are opposite to the core; in the case of such a casing, the connection which allows the plate to slide freely relative to the casing is advantageously constituted by a slot made in an angled return perpendicular to the core of the casing, said slot being substantially equidistant from the two wings of the casing and being crossed by the plate; the aforementioned square return is advantageously constituted by
• FIG. 1 shows the longitudinal section of the part of a wiper element according to the invention, which is located in the vicinity of the articulation of the housing on the head, the head being disposed relative to the housing in the position where it is when the wiper arm is in the operating position, that is to say when the wiper blade is in contact with the windshield associated with the wiper.
• FIG. 2 shows a bottom view along II-II of Figure 1;
• - Figure 3 shows the wiper element of Figure 1 in the extreme position of the head relative to the housing, which corresponds to the complete clearance of the wiper relative to the windshield;
• - Figure 4 shows the wiper element of Figure 1, when the head occupies relative to the housing the other extreme position of its authorized angular movement, this position being in fact never reached, therefore that the wiper element is mounted on a vehicle but corresponding to a limitation of the angular movement of the head when the wiper element is stored as a spare part.
• the windscreen soot element comprises a windscreen wiper arm
• the arm 1 which is connected to an assembly head 2 via a housing designated by 3 as a whole.
• the arm 1 is secured to the casing 3 by means of two rivets 4. Beyond the riveting zone of the arm 1 on the casing 3, the arm 1 is bent at 90 ° to constitute a return square 5. In this return at right angles, a slot 6 is provided, arranged in the median zone of the metal plate, which constitutes the arm 1.
• the casing 3 has a U-shaped cross section: it consists of two substantially parallel wings 3a connected together by a core 3b .
• the wings 3a of the casing 3 support the hinge pin 7 of the head 2 relative to the casing.
• the axis 7 is arranged perpendicular to the wings 3a, in the zone of these wings which is the furthest on the one hand from the arm 1 and on the other hand from the core 3b.
• the head 2 comprises a sleeve 8 provided with a bore, which is crossed by the axis 7.
• the axis 7 has 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.
• a stirrup consisting of two parallel wings 9 between which is disposed one end of a plate 10 having a generally substantially rectangular shape.
• the assembly, between the plate 10 and the two wings 9 is carried out by means of an axis 11, which constitutes a cylindrical articulation between the plate 10 and the head
• the head 2 has a bore 2 ⁇ a intended for the positioning of the head on the drive shaft (not shown) of the wiper element, the drive shaft which is moved in alternating rotation by an appropriate mechanism.
• the fixing of the head 2 on its drive axis is carried out at by means of a nut, which is screwed at the end of the axle.
• the axis 11 and the bore 2 are arranged on either side of the plane passing through the axis 7 and perpendicular to the core 3b.
• the core 3b is limited, on the side of the axis 7, by a transverse border 3c disposed approximately at the right of the axis 11.
• the windscreen wiper element according to the invention can be associated with a cap (not shown in the drawing), it being understood that said cap must allow the movement of the head 2 by relative to the casing 3 and the establishment of the assembly nut, which fixes the head 2 on its drive axis.
• the plate 10 has one of its ends articulated around 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 has, in its central zone, a rectangular recess 12, of which the major axis is arranged parallel to the long side of the plate 10, which is itself substantially rectangular as has been specified above.
• a projection 13 consisting of a triangular point, which forms a relief in the recess 12.
• a helical spring 14 has been arranged working in compression. The length of the recess
• the spring 13 provides the centering of the spring 14 in the recess 12; but it is quite clear that at the end of the recess 12, which is opposite to the projection 13, the spring is not held perpendicular to the plane of the plate 10.
• the end of the spring 14, which does not is not centered on the projection 13, rests on the core of a plate 15, which has a U-shaped cross section: the plate 15 has two parallel wings 15a connected together by a core 15b arranged perpendicular to the plate 10
• the plate 10 passes through the core 15b thanks to a slot 15 £ made in the soul 15b.
• the core 15b is pushed into abutment against the return to square 5 by the spring 14.
• the wings 15a of the plate 15 are spaced apart by a distance substantially equal to the outside diameter of the spring 14, so that they lock in position said spring 14 in the direction perpendicular to the plate 10.
• the spring 14 works under compression and develops a force between the return at right angles 5 and the articulation axis 11; this force creates a torque which, assuming the head 2 fixed since it is integral with the drive axis, tends to cause rotation of the arm 1 in the direction indicated by the arrow F in FIG. 1.
• This torque is the one which allows apply the wiper blade to the windshield during wiper operation.
• the zone 10a of the edge of the plate 10 which is in the vicinity of the axis 11 therefore constitutes a stop limiting the angular movement of the head 2 relative to the casing 3, this zone 10a coming in support against the sleeve 8 of the head 2.
• the profile adopted for the zone 10a depends of course, on the limitation of angular movement that is desired.
• the part 10 has a significant resistance to bending, because it has been given a great height by having it on either side of the spring 14.
• this part being external to the spring 14 can without any difficulty, have an increased thickness if necessary. It is therefore found that this structure makes it possible to avoid any deformation in bending when the arm of the ice-wiper is released relative to the windshield.
• the assembly of this wiper element is carried out without any difficulty: the arm 1 and the casing 3 are first assembled by riveting; then the head 2 and the plate 10 are assembled by means of the pin 11; then put in place in the recess 12, the spring 14 and its anti-buckling guide 16 and the plate 15 is disposed at the end of the spring 14 which does not come on the projection 13, by sliding the plate 10 in slot 15c. Then engage the free end of the plate 10 in the slot 6 and put the spring 14 in compression by pushing on the axis 11 until the bore of the sleeve 8 comes opposite the orifices provided in the wings 3a, for axis 7; the axis 7 is then put in place, which secures the assembly.
• the assembly and manufacture of the wiper element according to the invention being simple, said element is of an attractive cost price, although it makes it possible to avoid any deterioration by deformation, even in the event of brutal action users in the movement of the wiper from the windshield.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Pivots And Pivotal Connections (AREA)
• Body Structure For Vehicles (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (1)

Family

ID=9228290

Family Applications (1)

Country Status (5)

Cited By (5)

Families Citing this family (1)

Citations (7)

Family Cites Families (1)

• 1979
  • 1979-07-25 FR FR7919195A patent/FR2462312A1/fr active Granted
• 1980
  • 1980-07-23 GB GB8033493A patent/GB2074849B/en not_active Expired
  • 1980-07-23 WO PCT/FR1980/000125 patent/WO1981000235A1/fr active Application Filing
  • 1980-07-23 JP JP50176580A patent/JPS56500881A/ja active Pending
  • 1980-07-23 DE DE803045269T patent/DE3045269T1/de active Granted

Patent Citations (7)

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