FR2562852A1 - WIPER SYSTEM FOR MOTOR VEHICLES - Google Patents

Abstract

THE INVENTION RELATES TO A WINDSCREEN WIPER SYSTEM INCLUDING A SWING ARM 1 AND A WIPER ELEMENT 8 REINFORCED BY A PRESSURE DISTRIBUTION LINK 9. THE PUSH OF THE SWINGARM 1 IS TRANSMITTED TO THE PRESSURE DISTRIBUTION LINK 9 AND THEREFORE TO THE WIPER ELEMENT 8 THROUGH THE ARTICULATIONS 5, 6, 7, THE RODS 11, 12, 13 AND THE BLADE SPRINGS 15, 16. THE WIPER SYSTEM ACCORDING TO THE INVENTION THEREFORE INCLUDES FOUR SUPPORT POINTS 11, 12, 15, 16 DISTRIBUTED ALONG THE PRESSURE DISTRIBUTION ROD 9. FIELD OF APPLICATION: MOTOR VEHICLES.

Description

The present invention relates to a wiper system, in particular

  for motor vehicles, comprising an oscillating arm whose one end is connected to a mounting head driven by a motor shaft and the part opposite the motor shaft is provided with two joints spaced apart, and also comprising two rods respectively connecting said hinges to a wiper element via claws and a rod of

pressure distribution.

  French Patent 1,409,802 shows a wiper system in which the rods mentioned above extend each of the two sides of a joint which is in the form of a rivet. Each rod is therefore a lever with two arms and one of the two arms of the lever is subjected to the action of a spring (formed inside the swingarm) so that the other arm of the lever is driven

  to the pressure distribution rod and the wiper element.

  The major disadvantage of this system is its complexity, particularly as regards the mounting of the rods on the swingarm and the mounting of

  springs inside the swingarm.

  British Patent No. 1,318,270 shows another wiper system in which the aforementioned rods are made either in the form of rigid bridges connecting the pressure distribution rod and consequently the wiper element to the oscillating arm , or in the form of bridges with two arms which, at their junction point, are interconnected by a spring which pushes said two arms towards the

  pressure distribution rod and the wiper element. The disad-

  rigid bridges is that they can only be used for wiping flat surfaces and the major disadvantage of bridges with two arms is, as in the case of the French patent 1,409,802, the complexity of mounting a system that uses rivets as articulation and

  springs to be placed inside certain rooms.

  The object of the present invention is the realization of a wiper system, of the type indicated above, which comprises only parts easy to manufacture and whose assembly of the various elements can be easily done by appropriate machines. The wiper system according to the invention will therefore be a cheap system and all the more so that all its elements (except possibly the arm

  oscillating) can be made of plastic.

  The wiper system according to the invention is essentially

  characterized in that: a) said two rods extend in opposite directions from their respective hinges to the pressure distribution bead and b) at their opposite ends to their respective hinges said two rods are each provided with a leaf spring whose end

  free relies on the pressure distribution rod.

  The wiper system according to the invention is furthermore also characterized by the fact that: a) the leaf springs are fixed to the ends of said rods by a snap-in system and b) said rods are attached to the joints corresponding by a

snap-in system.

  Other features of the invention will be better

  included in the following description of a method of

  FIG. 1 is an elevational view of the wiper system according to the invention; FIG. 2 is a plan view of the windscreen wiper system of FIG. 1; Figure 3 is a plan view of the mounting head of the wiper system of Figures 1 and 2; - Figure 4 is a section along line IVIV of the mounting head of Figure 3; - Figure 5 is a section along the line V-V, the wiper system of Figure 1;

  FIG. 6 is a section along the line VI-VI of the wiper system;

  ice of Figure 1; Figure 7 is an elevational view of one of the leaf springs of the wiper system of Figure 1; Figure 8 is a plan view of the leaf spring of Figure 7; - Figure 9 is a section along the line IX-IX of the leaf spring of Figure 8; - Figure 10 is an elevational view of one of the rods of the wiper system of Figure 1; - Figure 11 is a side view along arrow XI, the rod of Figure 10;

  FIG. 12 is a plan view of the rod of FIG.

  Figures 1 to 4 show the entire wiper system according to the invention. This system essentially comprises: an oscillating arm 1, two (5, 6) or three (5, 6, 7) articulations, two (11, 12) or three (11, 12, 13) rods provided with claws 11 ", 12 ", 13", two leaf springs 15, 16, a pressure distribution rod 9 is a

wiping element 8.

  The oscillating arm 1 is driven by the head of

  2 (FIG 3, 4), itself driven by the motor shaft shown in the figures by its geometric axis A-B. A cap 3 covers the mounting head 2 and the motor shaft. It should be noted that the attachment system of the swing arm to the mounting head 2 as shown in Figures 3 and 4 is not part of the invention. It can indeed be replaced by any other system and more particularly by a conventional system comprising an articulation and a spring between the

  swingarm and mounting head.

  The articulation 7 and the stem 13 with the claws 13 "

  are optional, ie these elements are not essential.

  sands for all applications of the wiper system according to the invention: they are even less necessary than the wiper element

  8 is short. In the following description the wiper system according to

  the invention will therefore first be described assuming that it comprises only the joints 5, 6 and the rods 11, 12 and not the joint 7

and the rod 13.

  When the wiper system, not provided with the articulation 7 and the rod 13, is in operation, the oscillating arm 1 is pushed towards the surface to be wiped, that is to say towards the distribution rod pressure 9 and the wiper element 8. This thrust of the oscillating arm 1 to the surface to be wiped is due either to the fact that it is elastic material and is prestressed to the surface to be wiped, or the fact that it is rigid and that a spring, fixed to

  the mounting head, acts on it in this sense (conventional arm).

  The thrust of the oscillating arm 1 is transmitted to the pressure distribution rod 9 and consequently to the wiper element 8 via the rods 11, 12 and leaf springs, 16. The wiper system 1 ice according to the invention therefore comprises four points of support, in this case the two claws 11 ", 12" and the two

  free ends 15 ", 16" of the two leaf springs 15, 16.

  It should be noted that the joints 5, 6 do not have springs which push the rods 11, 12 towards the

  pressure distribution rod 9. The leaf springs 15, 16 comprise

  a curved portion 15 ', 16' which allows them to be fixed to the rods 11, 12 by a snap-in system. The claws 11 ", 12" are capable of

  slip into lateral grooves in the support bar

  9, while the free ends 15 ", 16" of the leaf springs 15, 16 are capable of sliding on said rod.

pressure distribution 9.

In Figure 1 we can see that:

  a) the rod 11, corresponding to the articulation 5, extends in the direction

  opposite to the motor shaft A-B,

  b) the rod 12, corresponding to the hinge 6, extends in the direction

  the motor shaft AB, c) the leaf spring 15, corresponding to the shaft 11, extends in the direction of the motor shaft AB, d) the leaf spring 16, corresponding to the shaft 12, s extends into

  opposite direction to the motor shaft.

  The details of execution of the joints 5, 6, the rods 11, 12, the leaf springs 15, 16, the pressure distribution rod 9 and the wiping element 8 are shown in FIGS. 5 to 12. All of these elements are made of a suitable plastic material, except for the wiping element 8 which is made of an elastomer. In FIG. 5 it can be seen that the hinge which is farthest from the drive shaft AB comprises a body 5 provided with a rivet 5 'by means of which said body 5 is riveted to the oscillating arm 1. The rivet 5' can be replaced by other fastening systems and

  in particular by a snap-in system.

  The lower part of the body 5 has the shape of a U-shaped

  poured and therefore has two side walls extending downwards. Cha-

  one of said side walls is provided with a cylindrical opening 5 "in which can snap the pins 11 'formed at the upper part of the rod 11. To facilitate the snapping of the pivots 11' in the openings 5" of the body 5 of the hinge said pivots 11 '

  are bevelled (17) at their upper part. When assembling the article

  culation itself the pivots 11 'are simply introduced

  from the bottom in the circular openings 5 "of the body 5 of the articu-

lation.

  The inverted U-shaped part 4 which is shown in FIGS. 1, 2 and 5 has no particular function, except from an aesthetic point of view by hiding the joint between the oscillating arm 1 and the joints 5, 6 and connecting these same joints

5, 6.

  FIG 6 is a cross section of the claws 11 "it is seen that these claws have two pins 19 capable of sliding in the grooves 9" (Figure 5) of the pressure distribution rod 9 and that the wiper element 8 is inserted into the opening 18 (FIG 5) which extends all along the pressure distribution rod 9. The claws 11 ", the pressure distribution rod 9 and the wiper element 8 can have various forms known in the

prior art.

  The hinge 6 with its rivet 6 'as the rod 12 with its nipples 12' and its claws 12 "(FIG 1, 2) have exactly the same shape and dimensions as the corresponding parts 5, 11

described above.

  Figures 7 to 9 show, on a larger scale, the leaf spring 16 of Figure 1, spring which is exactly the same as the leaf spring 15 of Figure 1. The leaf spring 16 comprises one of its ends a curved portion 16 'provided with a stop 21 which because of the bevelled portion 22 allows it to snap into the hole

  23 (Figs 10, 11, 12) of the rod 12. The leaf spring 16 is thus rigid.

  The other end of the blade spring has a fulcrum formed by a curved surface 20 which can slide on the upper face 9 '(FIG 5, 6) of the pressure distribution rod 9 and by two side walls 16 "which guide the sliding of

  the curved surface 20 along the pressure distribution rod 9.

  The two leaf springs 15, 16 (FIG 1) are prestressed from the respective claws 11 ", 12" towards the pressure distribution rod 9

  and thus transmit the thrust of the oscillating arm 1 towards the central part.

  The rod 12 shown in FIGS. 10 to 12 is exactly the same as the rod 11 (FIG 1) and all its characteristics have already been described above, namely the bevelled pivots 12. ', 17, the claws 12 ", 19 and the hole 23 which receives the stop bisauté 21, 22 of

leaf spring 16.

  Similarly, the articulation 7 (7 ') and the rod 13 (13', 13 ")

  are identical to the corresponding parts 5, 6 and 11, 12 (FIG 1).

  The hinge 7 and the rod 13 do not transmit the thrust of the oscillating arm 1 towards the pressure distribution rod 9. Their only function is to make the entire windshield wiper system more rigid, particularly in the case where the pressure distribution rod 9 and by

  Therefore the wiper element 8 exceeds a certain length.

  An embodiment of a new invention has thus been described, but it is obvious that the invention is not limited to this embodiment. Indeed changes and / or changes can be made without departing from the scope of the invention as

  as defined in the appended claims.

Claims (10)

  1.- wiper system, particularly for motor vehicles, comprising a swing arm (1) whose one end is connected to a mounting head (2) driven by a motor shaft (A-B) and   the opposite of which to the motor shaft (A-B) is provided with two articu-   5, 6) spaced apart from one another, and also comprising two rods (11, 12) respectively connecting said hinges (5, 6) to a wiping element (8) via claws (11 ", 12"). ) and a pressure distribution rod (9), characterized in that: a) said two rods (11, 12) extend in opposite directions   from their respective hinges (5, 6) to the rod of -   pressure distribution (9) and b) at their opposite ends to their respective hinges (5, 6) said two rods (11, 12) are each provided with a leaf spring (15, 16) whose free end ( 15 ", 16") builds on the rod pressure distribution (9).   2. A wiper system according to claim 1, characterized in that: a) the rod (11) corresponding to the hinge (5) farthest from the driving shaft (AB) extends in the direction opposite to said motor shaft, and b) the rod (12) corresponding to the hinge (6) closest to   the motor shaft (A-B) extends in the direction of said motor shaft.   3. A wiper system according to claim 2, characterized in that: a) the leaf spring (15) corresponding to the rod (11) farthest from the drive shaft (AB) extends into the direction of said motor shaft, and b) the leaf spring (16) corresponding to the rod (12) closest to the motor shaft (AB) extends in the opposite direction to said shaft engine.   4. A wiper system according to claim 1 wherein the motor arm (1) comprises a third articulation (7),   characterized in that the third hinge (7) is located between say two joints (5, 6).   5. Wiper system according to claim 4, characterized in that the third hinge (7) is connected to the pressure distribution rod (9) via a third rod (13) provided with claws (13 ") at its opposite end to said third articulation (7).   6. Wiper system according to any one of   Claims 1 to 5, characterized in that the claws (11 ", 12", 13 ")   said rods (11, 12, 13) are capable of sliding in grooves   side (9 ") formed in the pressure distribution rod (9).   7.- Wiper system according to any one of   Claims 1 to 5, characterized in that the leaf springs (15, 16)   attached to the ends of said rods (11, 12) by an interlocking system.   ging. 8.- Wiper system according to any one of   Claims 1, 4 and 5, characterized in that said rods (11, 12,   13) are attached to the corresponding joints (5, 6, 7) by a snap-in system.   9. Wiper system according to any one of   Claims 1, 4 and 5, characterized in that the articulations (5, 6,   7), the rods (11, 12, 13), the leaf springs (15, 16) and the pressure distribution bead (9) are made of suitable plastics. 10. Wiper system according to claim 1, characterized in that the oscillating arm (1) is made of an elastic material.