FR2546459A1 - VEHICLE WIPER MECHANISM WITH A PARKING POSITION AND ITS ELECTRICAL CONTROL CIRCUIT - Google Patents

Abstract

CRANK MECHANISM ALLOWS TO PLACE THE WIPER BLADES IN THE PARKING POSITION BEYOND THE EXTREME NORMAL STOP POSITION. THE CRANK CONSISTS OF TWO PARTS 1, 2 WHICH ARE LINKED TO BETWEEN THEM; ONE END 1B OF THE COUPLING IS FLAT, WHILE THE OTHER SHAPES A FORK 2A, 2B TO RECEIVE THE FLAT END; THIS HAS TWO RADIAL STOPS 4, 5 ANGULAR OFFSET AND SHAPED IN THE BOTTOM OF THE FORK; DURING NORMAL OPERATION, THE TWO PARTS 1, 2 FORM A CERTAIN ANGLE BETWEEN THEM WHILE, TO PLACE THE BRUSHES IN THE PARKING POSITION BY A ROTATION IN THE DIRECTION OF THE DRIVE MOTOR, THESE PARTS ARE ALIGNED AND THE BRUSHES BY A ADDITIONAL RACE, ARRIVE IN PARKING POSITION; THIS REVERSE ROTATION IS OBTAINED BY INVERSION OF THE POLARITY OF THE SUPPLY VOLTAGE, COMMANDED BY THE OPERATOR THROUGH AN APPROPRIATE CIRCUIT. APPLICATION TO WINDSCREEN WIPERS IN GENERAL.

Description

The present invention relates to a crank mechanism for placing

  the blades of a windscreen wiper or other similar device in a parking position which is offset from the normal position

  said end of stroke or stop 9 t, and in which this position of

  is reached by having an additional angular stroke

  broom, this extra race being obtained, following the in-

  version of the direction of rotation of the electric drive motor, thanks to the elongation of the crank which is on the one hand wedged on the output shaft of the reducer and on the other hand integral in rotation with the axis of the

rod.

  The invention also relates to a windscreen wiper or other device

  similar type similar to a crank mechanism, and the electric control circuit of the wiper which allows, among other things, to obtain the reversal of the direction of rotation of the electric motor to

  place the brooms in the parking position.

  Crank mechanisms for windshield wipers are known in the

  what the extra stroke the brooms make to cross the

  between the stop position and the parking position (which is normally a retracted position), is obtained by the lengthening of the crank which is determined by the reversal of the direction of rotation of the motor. According to a known mechanism crank, it is formed of two

  superimposed parts and interconnected by an axis carried by one of el-

  which bears against a profiled element formed on the other part, of such

  so that the axis can take in this profile two limit positions, se-

  when the windshield wiper is controlled to operate normally,

  or that he must have an extra broom run performed.

  In addition, the aforementioned axis cooperates with guide means so as to

  to resume its normal position after the windscreen wipers have ac-

  compli this extra race It is obvious that such a solution produces a friction between the coupled organs, o o a possibility of seizure between these organs In addition, this solution is at once

  constructively complicated and expensive.

  According to another solution, the two parts of the crank are

  mated with an eccentric, using guide springs.

  dage. This solution is also complicated and its operation is

unreliable.

  The object of the present invention is to provide a device--2manivelle of the aforementioned type in which the crank itself avoids the disadvantages mentioned above and, more particularly, is a realization both simple and economical, congestion reduced and reliable operation, while being perfectly interchangeable with common cranks. According to the invention, the above-mentioned objects are embodied in the form of a crank mechanism in which the crank itself consists of two coplanar parts, coupled together by a hinge and in which the coupling end of each part has two radial stops, angularly out of phase with each other 9 which

  cooperate with corresponding radial stops formed at the other ex-

  in such a way that during normal operation of the wiper

  the two crank parts are separated by two radial abutments arranged facing one another and take a first angular position in which the distance between the axis of the crankshaft

  gear reducer and the pivot pin of the connecting rod is mini-

  male, while, when one actuates the wiper to put the brooms

  in the parking position as a result of a rotation in the

  from the electric motor, these parts of the crank, because of the meeting of the two other radial stops corresponding, take a second angular position-in which the distance between the pivot of the shaft of rotation of the gear reducer and the pivot of articulation of the connecting rod is greater than the distance between these pivots when the

  two parts of the crank are placed in the first angular position

lar.

  According to an advantageous embodiment of the invention, the two parts of the crank, when they are in the second relative angular position, are aligned with each other and the distance between the axis

  of the gearbox shaft and the connecting pin of the connecting rod is

  In addition, in order to obtain a satisfactory coupling, one of the

  articulated mites is simple and flat, while the other is shaped

  fork so that it can receive and guide the flat end.

  The control circuit of the positioning maneuver of

  of the wiper blades is characterized by the fact that

  comprises electromechanical and / or electronic means which, when

  appropriate manual control is operated and in real service,

  (a) the control of the rotation of the engine in the same direction as that in which the engine rotates during the normal operation of the ice-soot until the crank, driven by the output shaft of the gear reducer, from the end position, has executed a rotation of about 1800, during which the first angular configuration is maintained (Figure 2) in which the distance between the extreme axes of rotation its two parts is minimal, and the brushes run the race "go" until reaching the extreme position that corresponds to that reached during normal operation of the wiper; then, successively: b) the control of the rotation of the motor in opposite direction 1 o until the crank, by a rotation of about 1800 in this direction

  contrary, it is replaced in the resting (or starting) position,

  during which the crank takes the second configuration (Fi-

  6) in which the distance between the aforementioned axes of rotation is greater than said minimum distance, and the brushes perform the return stroke until reaching the parking position by an additional stroke.

  Other details and advantages of the invention will emerge clearly

  during the following description of a preferred embodiment

  of the invention and refers to the accompanying drawing, given merely as an example of

  non-limiting ple and in which: FIGURE 1 schematically shows the crank mechanism of a dual wiper which has incorporated the crank according to the invention, under normal operating conditions;

  FIG. 2 is a plan view of the crank mechanism of FIG.

  Figure 1, shown in said normal operating conditions; FIGURE 3 is a sectional view taken along the line III-III of Figure 2; FIGURE 4 is an exploded plan view showing the two parts

  separated from the crank mechanism according to the invention, with its axis of

ticulatione

  FIGURE 5 is a schematic representation of the mechanism for

  Figure 1, during the positioning operation of the station

brooms;

  FIGURE 6 is a plan view of the crank mechanism of the FIG.

  Figure 5, shown during said parking maneuver; FIGURE 7 shows the crank mechanism of Figure 2, with means for holding the crank in the acquired position; FIGURE 8 is a sectional view, taken along the line VIII-VIII, of the crank mechanism of Figure 7; FIG. 9 shows the crank mechanism of FIG. 6 with means for holding the crank in the acquired position; FIGURE 10 is a plan view of a wafer which is an integral part of the holding means, and FIGURE 11 shows the circuit diagram of the control circuit.

  a wiper equipped with the device according to the invention.

  If we first look at Figure 1, we see in A the output shaft of the gear reducer (not shown) and in M the crank

  designed according to the present invention and which controls the blade 51 by means of

  intermediate rod B 1, a pendulum C 1 can oscillate about the axis P 1, and the wiper arm or brush holder T and the broom 52 itself, through the intermediary of connecting rods B1 and B2 articulated to each other, the balance C 2 which oscillates around the axis P 2, and the other wiper arm or brush holder T 2 is designated by the letter

  OC the scanning angle traveled by each blade S 1 or 52 during the operation

  Wiper blades S 1 and 52 are shown

  in the so-called end position or stopping position 9 t.

  According to the invention, the crank mechanism M is composed of two coplanar parts 1 and 2 coupled together by a pivot C and of which

  the two outer ends are pivotally coupled respectively

  with the shaft A and the connecting rod B 1.

  As clearly shown in Figures 2, 3 and 4, the part 1 is constituted by a plate having the pivot B to ensure the connection

  articulated or hinged with the connecting rod B 1, and a hole therefor

to read this articulation.

  Part 2, also constituted by a plate, presents

  c 8 te hinge a fork 2 a, 2 b intended to receive and guide the ex-

  flat end lb of the plate 1, while the opposite end of this part 2 has a frustoconical hole 2c to receive and block the end of the shaft A The two c 8 tees or wings of the fork are

pierced with holes 2 d.

  The hinge is made through a pivot 3 which passes through the holes 2 d and the two ends of the coupled plates This pivot 3 presents

  on one side a head 3a and on the other side c 8 té 3b it is riveted so that

  the two parts 1 and 2 with an articulated coupling.

  The pivot 3, (see also FIG. 4) is provided with a cylindrical central part 3c which cooperates with the hole 1a of the wafer 1,

  and two faceted or prismatic side portions 3 d and 3 e,

  tions, the r 8 of which will be explained below.

  According to an important aspect of the invention, the end c 8 té ac-

  coupling of the wafer 1 has two radial stops 4, 5 out of phase

  angularly between them and which cooperate with radial stops cor-

  6, 7 formed on the coupling end of the other

  2, so that the two articulated or hinged parts 1 and 2 can take two limited angular positions as a result of

  encounters of the respective stops 4, 6 and 5, 7 between them.

  To simplify the construction, the radial shoulders 4, 5 of the wafer 1 are in the same diametral plane passing through the axis of the pivot 3, while the stops 6, 7 of the wafer 2 are forei mated at both ends of the bottom of the fork 2 a, 2 b and lie

  on two convergent planes also passing through the axis O of the pivot 3.

  In this way, the contact between the corresponding stops

produced on flat faces.

  The bottom of the fork has a clearance 8 of concave shape to allow rotation of the end of the wafer 1 which ends with a corresponding circular surface 9 The two limiting angular positions that take the two parts of the crank 1 and 2 during operation are shown respectively in FIGS. 1 and 2 and FIGS. 5 and 6. The relative angular disposition of the two parts 1 and 2, as shown in FIG.

  two parts during the normal operation of the windshield wiper,

  that is, when the output shaft A of the gearbox is

  M are in the opposite direction to that of the hands of a

  be, as indicated by the arrow F 1 in Figure 1.

  Indeed, during the anti-clockwise rotation of the shaft A, the crank axis B reacts to this rotation by causing the rotation of the parts 1 and 2 about the hinge axis until the abutment surfaces 4 and 6 meet, these faces 4 and 6 remain in contact with each other for the duration of the operation of the wiper, mime than during the time

  resting period during which the brushes 51 and 52 are held in the position

  end-of-travel or stop motion shown in Figure 1.

  Under these operating conditions, the distance G 1 (see FIG.

  2) between the axis of the pivot of the connecting rod B and the axis of the shaft A (or hole 2c) is at its minimum value,

  The aligned position of the parts forming the crank 1, 2 that

  Figure 6 is the one taken by these parts during the so-called parking maneuver of the windscreen wiper, that is during the maneuver.

  which consists of bringing the brushes 51 and 52 into a shifted position

  beyond the end position shown in Figure 1.

  This maneuver is obtained by reversing the direction of rotation of the

  electric motor by means of an electric control circuit of the wiper.

  As shown in FIG. 5, F 2 has the opposite direction (that is to say the clockwise direction) of rotation of the shaft A, which makes it possible to position the brushes in position. parking after an additional rotation corresponding to an angle i 3 beyond

  the normal end position, shown in broken lines.

  However, it should be noted that the brushes 51 and 52 reach the parking position only after a complete round trip from said end position.

  another characteristic of the invention shown in FIG.

  course "go" brooms is still done with a rotation of anti-direction

  handwheel M (see Figure 1) and the inversion of the sense of rotation

  In any case, under the conditions of clockwise rotation of the crank, the distance G 2 between the axis of the connecting rod pivot B and the axis of the shaft A ( or hole 2 c) is the maximum distance Naturally, this condition of maximum distance is satisfied by the choice of the position of the radial stops 5 and 7 which

  meet precisely at the moment when both parts 1 and 2 of the

  level are aligned with each other.

  However, it is obvious that this encounter may occur in a condition of non-alignment of the aforementioned parts, and in this case the

  distance will be less than G 2 but always greater than G 1.

  soot-ice is at rest and the two brushes 51 and 52 are in the end position shown in Figure 1, or in the parking position shown in Figure 5, it may be better to provide

  cranks retaining means, that is to say means capable of e-

  put some pressure on parts 1 and 2 in the configuration

  angular position obtained in the said positions and which show respectively

  Figs. 2 and 6, to avoid that, either as a result of the brushes being lifted, or because of an accidental intervention, or because of a manipulation error, or for any other reason or circumstance, such as, for example, action of the wind, the parts forming the crank can change their angular disposition and therefore do not keep on the glass the end position or parking in which the brushes would have arrived According to the invention, these means are constituted by two resilient retainers 10 (see Figure 10) which are respectively locked on two outer sides of the fork 2a, 2b of the wafer 2 by riveting 3b of the axis

or pivot 3.

  Each elastic plate has a square-shaped hole 11 which adjusts, as shown in FIG. 8, to a portion of corrugated shape.

corresponding 3 d of the pivot 3.

  As has been pointed out above, these parties have

  different conditions so that the two plates form between them an

  8/2, which is half the angle 8 that the crank parts 1 and 2 must travel to pass from the first angular position (see

  Figure 7) at the second angular position (see Figure 9).

  Each elastic plate carries at its free end a protrusion

  12 adapted to snap into a corresponding cavity or hole 13

  formed in part 1 of the crank, so that both

  holes 13 are out of phase with each other by the same angular value 6.

  The projections 12 have a hemispherical shape and the inlet or mouthpiece

hole 13 is flared.

  In FIGS. 7 and 8 it can be seen that the lower plate 10

  its own protrusion in a hole provided for this purpose in part 1, whereas in Figure 9 it is the upper plate 10 which engages

  its own projection in the other hole.

  Naturally, the pressure with which the protrusions 12 are

  maintained in the holes 13 is calculated in such a way as to prevent it from

  counteract the direct control effort to vary the

  relative to both parts of the crank during operation

the wiper.

  As has been pointed out above, during the operation of setting the wiper blades in the parking position, the reversal of the direction of rotation of the crank M takes place only at the end of the "go" race. "brooms, that is to say after they have traveled the angle

  from the normal rest or stop position shown in Figure 1.

  Indeed, during the "forward" stroke of the brushes, which results from a rotation of about 180 of the crank from the rest position, this crank is still rotating in the counterclockwise direction (see arrow F 1) in order to maintain the angular configuration which is the one that produces normal oscillations of the brushes, equal to the angle.

  about half a turn, the crank on the contrary reverses its sense of

  to return, with a clockwise rotation (see arrow F 2) of the same angular amplitude, to its starting position But -8 the inversion of the direction of rotation causes the lengthening of the crank, since its parts 1 and 2 are aligned with each other, so that when the crank is in the position shown in Figure 5

  the brooms will also have traveled, beyond the angle O <, the angle

  Complementary R which allows the brushes to reach the so-called parking position. In conclusion, during the parking maneuver, the crank will rotate about 1800 counter-clockwise, keeping the configuration of Figure 2, while it will then turn on the same angle but in the opposite direction, which will gives the configuration that

shows Figure 6.

  With this particular arrangement, the brushes, during said parking maneuver, will not exceed, during the scan "go", the extreme positions P 1 -X; P-Y they reach during the

  normal operation of the wiper.

  Figure 11 shows a control circuit of the sta-

  which enables the operating conditions

  above, in combination with a circuit known to perform the function

  Continuous and intermittent operation of the windscreen wiper.

  The known circuit comprises: a four-position manual switch 15 comprising a movable arm 15 connected to the positive (+) terminal of the battery and four fixed contacts (15b, 15c, 15d and 15e), with which this movable arm cooperates in order respectively to carry out the continuous operation of the wiper, -25 either at high speed (position II), or at slow speed (position I), the intermittent operation (position i) and the reset wiper blades (position O); a permanent magnet excitation type direct current electric motor 16, which comprises three brushes or coals 16a, 16b, and 16c, this motor rotating a cam 17 keyed to the shaft A of the gear reducer, to control the limit switch 18; an electrical circuit 19, delimited in the diagram by dashed lines, to ensure the intermittent operation of

  the windscreen wiper, this circuit comprising a telerelais 20 composed of a windshield wiper

  21 and a two-position switch 22 in which the exciter

  The winding is controlled by a transistor 23, which in turn is controlled by a delayed action circuit designated 24 and which may be

resistance-capacitor type.

2546459-

_ 9-

  The control circuit of the parking maneuver according to the in-

  The invention comprises: a two-position control pushbutton 24 actuated by the driver to perform the parking maneuver; this device 24 is of the type with unstable working position, that is to say with automatic return to the rest position when the control action exerted on the push button ceases; an initial supply circuit of the motor 16, which controls the rotation of this motor in the same direction as that observed during normal operation of the wiper until the instant o is the cam 17 or the crank M, to from the end position represented

  in Figure, have rotated about 1800 This circuit of

  initially closed by two contacts 24b of the pushbutton 24 and the limit switch 18 in the "end-of-travel" position (18a on 18b), to be maintained by this switch 18 in the working position ( 18 a of 18 c) In this circuit, the broom or coal 16 is the engine inlet and the broom or coal 16 c is the output;

  a probe to detect the extreme position reached by

  Wiper blade during their outward stroke, this probe consisting of a simple switch 25 controlled by the same cam 17 which actuates the switch 18 The switch 25 is placed in the closed position (with the movable contact 25 a on the fixed contact b) when the cam has rotated about 180 from the end position In this way, the closing of the switch 25 coincides with

  the moment when the wiper blades, during the outward run, reach

  close to the extreme normal position;

  a switching circuit 26 of the polarity of the supply voltage

  the engine, also delimited by a line in broken lines.

  in the diagram, and adapted to insert, when closing the position switch 25, a supply circuit in the opposite direction of the motor, so that the latter changes direction of rotation This circuit 26 comprises two remote switches 27 and 28 each having a winding 29 and 30 and a

  two-position switch 31 and 32 The windings are energized if

  simultaneously under the control of a transistor 33 in turn controlled by a delayed-action circuit 34 also of the type resistorecondensateur (RC) In the inverted supply circuit cited above the broom or coal 16 c constitutes the engine inlet, while the broom or coal

  16 is the exit Since the closure of the interrup-

  25 occurs after a rotation of about 1800 of the cam 17, this -

  means that the feeding and consequently the rotation in the opposite direction

  motor will start after an initial rotation of crank M

  in the direction of the arrow F 1 by about half a turn from the position

  resting arrangement shown in Figure 1; a parking sensor probe, constituted by a two-way switch 35 which cuts the inverted supply circuit of the

  motor, so as to cause it to stop, as soon as the wiper blades

  ice, during the return race, reach the position of sta-

  For this purpose, the switch 35 can be actuated by any means.

  what part of the control transmission of the wiper blades,

  when that body reaches the position corresponding to the sta-

  wiper blade assembly; such an organ can be for example

  the pendulum C 1 (see Figures 1 and 5).

  To better understand the control circuit of the

  parking maneuver, it should be noted that the

  engine initialization 16 also includes, in addition to the two

  24 b push button 24 and switch 18 in both po-

  sitions, the following contacts, all in the rest position: movable contact has switch 35, movable contact 22a of switch 22 and both

  movable contacts 31a and 32a switches 31 and 32; while the cir-

  bake which provides power to the motor in the opposite direction comprises the movable contact 35a of the switch 35 in the rest position and both

  movable contacts 31a and 32a have switches 31 and 32 in working position

  vail (31 out of 31c and 32 out of 33c).

  we will now briefly describe the operation of the circuit of

  Figure 1 on which the various components are represented in posi-

rest.

Continuous operation

  By placing the movable element 15a of the manual switch 15 in position

  I or II, the motor 16 will rotate at slow speed

  pick up or at high speed, and will drive the wiper blades 51 and

S at a corresponding speed.

  The slow speed motor supply circuit is as follows: + battery, element 15a on 15c, contact 31a on 31b, brush 16a, motor winding, brush 16c, contact 32a on 32b, masses while

  high speed the power circuit is the following -

  + battery, element 15a on contact 15b, brush 16b, winding mo-

  brush, broom 16c, contact 32a on 32b, mass.

  At the end of operation, by replacing the switch 15 in the 11 -

  position (position 0), the engine rotates until the

  mobile touch 18 a is placed again on the fixed contact 18 a, and at this precise moment the winding of the motor is short-circuited, which slows down

engine.

  Intermittent operation The contact 15a is placed in the position i The motor is powered through the following circuit: + battery, element 15a on 15d, contact 22a on 22b, contact 31a on 31b, broom or coal 16 a, motor winding, broom or coal 16 c,

contact 32 a on 32 b, mass.

  As a result of starting the engine, the contact 18a moves on 18c and the following power supply circuit becomes: + battery, element 15a, contact 35a on 35b, contact 18a on 18c,

  contact 22a on 22c, broom or coal 16c, contact 32a on 32b, mass.

  As can be seen, the circuit comprises the movable contact 22a on the fixed contact 22c This switching of the contact 22a is due to the excitation of the remote switch 20 which results from the turned-on state of the transistor 23 as a result of the charge of the capacitor 36 of the delayed-action circuit 24. As soon as the windscreen wiper blades have completed their complete (round-trip) travel, the movable contact 18 has replaced itself on 18 b and the motor is

  stopped, since its winding is short-circuited.

  The time of pause or pause during which the engine is stopped,

  is determined from the discharge time of the capacitor 36 in the circuit

cooked 24.

  This discharge begins as soon as the movable contact 18a has returned to the contact 18b During the entire duration of the discharge of the capacitor 36, the transistor 23 remains conductive and consequently during the same period of time the remote switch 20 is excited, so that the movable contact 22a remains on the fixed contact 22 c When the capacitor has been discharged, the transistor 23 is prohibited, the remote switch 20 is de-energized and the contact 22 has returned to its rest position as shown in FIG.

  this moment, the cycle starts again and so on until we

  places the switch 15 in the rest position.

  When this occurs, the motor continues to rotate until the moment the contact 18 meets 18b, after which its winding is

  short circuit and the engine is braked.

  Parking Maneuver The element 15a being in the rest position (position 0) and the movable contact 12a 18a of the end-of-travel switch 18 being on the fixed contact 18b (the wiper blades 51 and S being in the off position 1 2 shown in Figure 1), if the push button 24 is actuated, the two contacts 24 b are closed and the following circuit is obtained s + battery, movable element 15 a, contact fixed 15 e, contact 35 a of the

  switch 35 on 35 b, pair of contacts 24 b, contact 18 a on 18 b, cir-

  In the course of this phase, as a result of the discharge of the capacitor 36, the transistor 23 becomes conductive and therefore excites the remote control switch 20, which causes the moving contact 22a to move on the fixed contact 22c. The following circuit for powering the motor 16 is therefore obtained: + battery, element 15a, contact 15e, contact 35a on 35b, pair

  of contacts 24b, movable contact 18a on 18b, contact 22a on 22c, con-

  tact 31 a of the switch 31 on 31 b, broom or coal 16 a, winding mo-

  brush, broom or coal 16c, contact 32a of switch 32 or 32b, ground.

  The motor therefore starts and simultaneously drives the cam 17,

  way that the mobile contact 18 has switched to the fixed contact 18 c.

  Meanwhile, during the switching of 18a, the remote switch 20 remains excited.

  expected that the transistor 23 is conductive through the discharge of the

  capacitor 36 'in the circuit RC 24-

After this switching, the contact 18a receives the + of the battery through the contact 18c, so that the motor supply circuit is still that previously described, with the only difference that has been excluded. now the contacts of the push button 24 which,

  therefore, can resume its rest position.

  During this first power phase, the motor rotates in the same direction as during normal operation of the wiper, so as to cause the anti-clockwise rotation of the crank M.

  Indeed, the + of the supply voltage is applied to the broom or char-

  3 o good 16a, while the broom or coal 16 c is connected to the ground, this connection is established precisely during normal operation of the wiper.

  The feed circuit described above is a feed circuit.

  the engine remains energized until the cam 17 has completed an initial rotation of about 1800, during which the crank rotates about half a turn in the direction of the arrow F 1 and the windscreen wiper blades S and S carry out a return stroke i 2 until they reach the extreme positions P 1 -X and P 2-Y after the rotation corresponding to an angle "13 - At the end of the rotation of about 1800, the cam 17 switches the movable contact 25a on the fixed contact 25b so as to determine the closing of the switch 25 and consequently the circuit in which

  it is inserted Indeed, with the closing of the switch 25 we ob-

  holds the following circuit: + battery, element 15a, contact 15e, contact 35a on 35b, contact

  a 25b, parallel windings 29 and 30, transistor 33 and ground.

  Thus, the simultaneous excitation of the remote switches 27 and 28 which determine the displacements of the movable contacts 31a and 32a respectively on the fixed contacts 31c and 32c. The excitation of 27 and 28 can take place because the transistor 33 is in the conductive state due to the discharge of the capacitor 37 in the RC circuit, 34, this

  capacitor having been loaded at the time of actuation of the button

  pushbutton 24 through the following circuit: + battery, element 15, contact 15e, contact 35a on 35b, pair of contacts 24b, delayed action circuit 34, ground Therefore,

  as soon as the switch 25 is closed, the motor is powered to function

  in the opposite direction through the following circuit: + battery, element 15a, contact 15e, contact 35a on 35b, contact 32a on 32c, broom or coal 16c, motor winding, broom or coal 16a, contact 31 a on 31 c, mass Indeed we observe in this phase

  that now is the broom 16 a which is connected to the mass.

  As a result of the inversion of the supply voltage, the motor thus rotates in the opposite direction, that is to say in the opposite direction to that

  in which he was turning during the first feeding phase.

  It follows that the crank M, starting from the position reaches

  after almost half a turn, and turning clockwise, returns to the rest position with a reverse rotation, that is to say along the arrow F 2 But, as soon as this reverse rotation begins, the The crank extends (see Figure 6), so that when it has returned to the rest position (Figure 5), the wiper blades S and 52 will have reached the parking position after a travel of

  return corresponding to the angle + / 3 (see Figure 5).

  At this moment, the engine is stopped because its circuit of

  final and contrary feeding is interrupted as a result of the opening

of the switch 35.

  This opening may be controlled by any member of the control transmission of the wiper blades. In FIGS. 1 to 5, it has been assumed that this element is the rocker C1 which acts on the switch 35 at the instant when the it takes the position that corresponds

  to that of parking for the wiper blades.

  The opening of the switch 35 cuts off the excitation of the remote switches 27 and 28, while the remote switch 20 remains energized until the end of the discharge of the capacitor 36 which maintains the conductive state of the transistor 23. The following circuit is thus obtained. braking system which blocks the motor: ground, 24A pair of contacts, 18A contact on 18B, 22A contact on 22c, 31A contact on 31B, broom or 16A coal, motor winding,

  broom or coal 16c, contact 32a on 32b, mass.

  From the description above it is clear that the circuit

  formed by the two remote switches 27, 28 and by the circuit with different action

  34 is a switching circuit of the supply polarity,

  because it excludes the normal power supply circuit of the motor and introduces

  This switching circuit can of course be produced in a different manner from that shown, its being, in each case, that which consists in switching, during the parking maneuver, the two circuits. supply of the motor, so that the crank M, while inserting the first circuit or normal supply circuit, rotates about 180 retaining

  the "short" configuration shown in Figure 2, whereas if

  the second circuit or reverse supply circuit, the crank

  turn on the same angle but in the opposite direction, then taking the

  ration "long" shown in Figure 6.

  It is obvious that even the two motor power circuits can vary with respect to the switching circuit and the different types of control circuitry of the continuous and intermittent operation of the wiper, without however departing from the basic principles. of the invention. -

Claims (14)

R E V E N D I C A T IO N S   1 Crank mechanism for placing the blades of a windshield wiper or the like in a stopping or parking position which is shifted beyond the normal end position or stop position, and in which the position of parking is reached thanks to an additional stroke of the brushes, obtained by reversing the direction of rotation   of the electric motor, which determines the lengthening of the crank, which   the on the one hand is wedged on the output shaft of the reducer entralné by the engine and on the other hand is integral in rotation with the axis of the rod, 1 o this mechanism being characterized by the fact that the crank consists of two coplanar parts coupled together by a hinge or hinge and that the coupling end of each portion has two radial stops, angularly offset between them and cooperating with corresponding radial stops formed on the other end, so that the two parts of the crank, during the function   windscreen wiper, thanks to the meeting of two stops   corresponding, take a first angular position in which the distance (G 1) between the axis of the gearbox rotation shaft and the pivot axis of the connecting rod is minimal, while, when the wiper is   actuated to place the brushes in said parking position   by reversing the direction of rotation of the motor, said parts, as a result of the meeting of the two other corresponding stops, take an angular position in which the distance (G 2) between the axis of   the gearbox rotation shaft and the fulcrum pin axis is   than the distance (G 1) between these axes when the two parts of   they are in said first angular position.   Crank mechanism according to claim 1, characterized   by the fact that both parts of the crank, when in   said second angular position are aligned with each other and   between the axis of the gearbox shaft and the pivot axis of the connecting rod is at its maximum value.   3 Crank mechanism according to one or the other of the claims   1 or 2, characterized in that one of the coupling ends of the crank is flat while the other is fork-shaped / so   to receive and guide the flat end between its prongs.   Crank mechanism according to Claim 3, characterized in that the two abutments formed at the fork-shaped end   are formed in the bottom of it, which also presents a   central cradle allowing rotation of the flat end of the other part of the crank.   Crank mechanism according to any one of Claims 1 to 4, characterized in that the stops provided on the coupling end of the crank portions are formed in planes passing through the axis of the pivot of the joint.   hinge, so that the contact between the abutments corresponds to   is carried out on flat surfaces.   6 Crank mechanism according to any of the claims   3,4 and 5, characterized in that the abutments formed on the flat end of the crank portion are aligned with one another.   single diametrical plane passing through the axis of the pivot of the hinge.   7-Crank mechanism according to any one of the claims   1 to 6, characterized in that at the location of the hinge, it comprises retaining means adapted to sufficiently stabilize the   two parts of the crank in the first and second angular positions.   8-crank mechanism according to claim 7, characterized   characterized by the fact that the retaining means are constituted by two plaquet-   elastic bands provided with a square-section hole, and clamped on the outer sides of the fork-shaped end by riveting the pivot of   hinge, and that this pivot engages in the hole of the plates in the   right of its faceted parts with different orientations (offset), so as to arrange these plates at an angle (S / 2) equal to half the angle (C) traveled by the two parts of the crank by passing from   the first at the second angular position, and that said pads   at their free ends, bulging projections intended to engage   under pressure in corresponding cavities provided on the flat end.   crank and angularly shift between them, following a   gle () equal to said angle traveled by the plates 9 Crank mechanism according to claim 8, characterized in that the cavities are made by means of two through holes and   flared at the entrance intended to receive the protrusions of the plates which pre- feel a hemispherical form.   Wiper or the like, having a crank mechanism   according to any one of claims 1 to 9   l Control circuit of parking maneuver   windshield wiper comprising a crank mechanism according to any one of claims 1 to 10, characterized in that electromechanical and / or electronic means control, as a result of the actuation of an appropriate manual control, and in the conditions of service 17 -   (a) the rotation of the engine in the same direction as that   during the normal operation of the windscreen wiper until the moment   the crank (M) driven by the output shaft (A) of the gear reducer   from the so-called end position, has rotated about 1800 (arrow F 1) during which it maintains an angular configuration (FIG. 2) in which the distance (G 1) between the axes Extremities of rotation (A, B) is minimal, and the brooms perform   the race to reach, or reach, the position   extreme, which corresponds to that reached during the operation north o 10 evil of the windshield wiper, then successively,   (b) the reverse rotation of the engine until the moment when the   velle (M), by a rotation of opposite direction (arrow F 2) of about 1800   returned to the rest (or departure) position, rotation during the   which the crank takes a second configuration (Fig 6) in which the distance (G 2) between the aforementioned axes of rotation (A, B) is greater   at the minimum distance mentioned above, and the brooms perform the race of re-   turn until reaching the parking position with a complementary (a).   Control circuit according to claim 11, characterized by   the fact that the electro-mechanical and / or electronic means   come in the parking maneuver include, in combination   with a circuit called continuous and intermittent operation of the soot-ice:   a push-button control (24) of the maneuver of sta-   operation, operated by the operator; a normal (or initial) power supply circuit for the windscreen wiper motor (16), which, as a result of putting said pushbutton into operating condition, controls the rotation of the motor in the same direction as that of its rotation during normal operation, until the moment when the crank (M), from the rest position, has rotated 180 ", a reverse (or final) motor supply circuit the wiper, which replaces the normal power supply   following the intervention of a switching circuit operated by a   fear of extreme normal position of the brushes during the outward stroke, this reverse supply circuit controlling the rotation in the in = verse direction of the engine until the moment when the crank (N), starting from the position reached after the rotation normal of about 1800, performed a return rotation of angular amplitude igmme to return to 18 - rest position (or initial departure);   a switching circuit (26) which cuts the power supply circuit   normal setting and inserts the reverse supply circuit of the engine as soon as a probe controlled by a member associated with the movement of the brushes indicates that the latter, during the outward stroke, have reached,   or near, the extreme position they take during the   normal wiper operation;   a parking sensor able to cut the power supply   Reverse the motor as soon as the brushes, during the return stroke, reach the parking position with an angular excursion   "+ A) corresponding to an inverse rotation of about 180 that the   he must execute to return to the rest position.   Control circuit according to Claim 12, characterized   in that the control push-button (24) is of the posi- unstable work situation.   Control circuit according to claim 12, characterized in that the switching circuit (26) comprises two remote switches (27, 28) whose excitation is effected simultaneously via   a transistor (33) controlled in turn by a resistance-con- densifier (34).   Control circuit according to Claim 12, characterized   by the fact that the parking sensor is constituted by a   actuator (35) actuated by a transmission member of the control of the wiper blades when this member takes the corresponding position   to that of parking brooms (51 g 52).   Control circuit according to Claim 128, characterized in that the feeler of the normal end position of the brushes during the forward stroke is constituted by a switch (25) controlled by the cam (17) of the limit switch (18). ) after a rotation   about 1800 from its rest position.   Control circuit according to one of the claims   12 to 16, characterized in that the normal (or initial) motor supply circuit comprises in series the manual switch (15) in   rest position (0), the contact (35 a) of the parking switch-   (35) in the rest position, a pair of push-button contacts   control (24) in the working position, the contact (18 a) of the interrup-   end switch (18), a contact (22 a) of a remote control switch (20) of the circuit   intermittent bake pan (19) in working position, and the contacts (31a, 32a) of the two remote control switches (27, 28) of the switching circuit (26). in the rest position.   18 Control circuit according to Claims 12 and 16, characterized   the fact that the reverse (or final) feed circuit of the   The engine comprises in series the normal switch (15) in the   pos (0), the contact (35 a) of the parking switch (35) in the rest position, and the contacts (31 a, 32 a) of the two remote control switches (27,   28) of the switching circuit (26) in working position -