JP2008013006A - Wiper system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiper system which widely wipes a windshield glass surface using a wiper blade, and setting the wiper blade along a protruding shape of a lower edge of the windshield glass at a stationary position. <P>SOLUTION: A wiper system W includes: a main arm 10 installed onto a pivot axis 3; a sub-arm 20 which rotates around a support axis 4; an connecting member 30; and a wiper blade 40 which is connected to the connecting member 30, and which completely wipes the windshield glass surface while changing the posture of the wiper blade 40 in accordance with the rotation of the main arm 10. The wiper blade 40 is connected to the connecting member 30 such that it can fit into the shape of the lower edge of the windshield glass at the stationary position. A sub-blade 50 is provided, on the main arm 10, such that the sub-blade 50 fits into the shape of the lower edge of the windshield glass on a base end of the wiper blade 40 in the longitudinal direction at a stationary position (a). In addition, a longitudinal axis line 50a is provided on the main arm 10 so as to form an obtuse angle to a longitudinal axis line 40a of the wiper blade 40. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wiper device, and more particularly, to a vehicle wiper device for wiping a windshield or the like of a vehicle.

2. Description of the Related Art Conventionally, in order to secure a wide area wiping area, a pantograph wiper device that wipes a wiping surface by changing a wiping posture of a wiper blade by a main arm and a sub arm is known (for example, see Patent Document 1).
In the pantograph wiper device described in Patent Document 1, a main arm is connected to a pivot shaft, and a sub arm is rotatably supported by a support shaft provided in the vicinity of the pivot shaft. The distal ends of the main arm and the sub arm are rotatably connected to a connecting member, and a wiper blade is connected to the connecting member.

In general, the lower edge portion of the windshield has a curved shape such that the central portion in the vehicle width direction protrudes forward of the vehicle. The wiper device is held so that the linear wiper blade is along the lower edge of the glass surface in the stop posture at the stop position (lower inversion position).
In the wiper device described in Patent Document 1, the main arm, the sub arm, and the wiper blade are held in a substantially parallel state at the stop position. When the main arm is driven by the pivot shaft from this state, the sub arm is rotated following the rotation of the main arm, and the wiper blade attached to the tip of these via the connecting member changes the wiping posture. That is, the wiper blade wipes the wiping surface while displacing the relative angle with the main arm.
In the pantograph-type wiper device, a wide range of the glass surface can be wiped by such a change in the wiping posture of the wiper blade.

Japanese Utility Model Publication No. 5-24465

  However, in recent years, the number of vehicles having a vertically long windshield in the vehicle front-rear direction has increased due to changes in vehicle design, and in such vehicles, the wiper blade is shorter than the longitudinal length of the windshield. Therefore, there was a problem that the upper part or the lower part of the windshield could not be wiped off.

On the other hand, if the wiper blade is made long to wipe the upper and lower parts of the vertically long windshield, the wiper blade can be arranged in the vehicle width direction along the curved lower edge portion at a low position on the glass surface. The problem that it cannot be performed and an appearance does not become favorable arises.
In addition, a technique using a wiper blade that is curved so as to follow the lower edge of the glass surface at the stop position is known, but with this technique, the cost of the blade alone is high and the blade rubber at the time of wiping is uneven. There was a problem that deformation occurred.

  In view of the above problems, an object of the present invention is to provide a wiper device capable of wiping a glass surface over a wide range with a wiper blade and disposing the wiper blade along the curved shape of the lower edge of the glass surface at a stop position. There is.

  In order to achieve the above object, the present invention provides a main arm attached to a first rotation shaft and rotated integrally with the first rotation shaft, and a second arm provided at a position different from the first rotation shaft. A sub-arm that rotates about a rotation axis, a connecting member that is rotatably connected to the main arm and the sub-arm via a first pivot and a second pivot, respectively, and a wiper blade that is connected to the connecting member The wiper device wipes the wiping surface between the stop position and the reverse position while changing the attitude of the wiper blade relative to the main arm as the main arm rotates. The main arm or the sub arm has a sub blade for wiping the wiping surface at the stop position so as to follow the shape of the edge of the wiping surface. The longitudinal axis of the wiper blade is disposed at an obtuse angle with respect to the longitudinal axis of the wiper blade so as to follow the shape of the edge of the wiping surface on the base end side in the longitudinal direction of the wiper blade at the stop position. It is characterized by.

Thus, since the wiper device of the present invention is configured in a pantograph type, the wiper blade wipes the wiping surface while changing the posture with respect to the main arm as the main arm rotates. It is possible to wipe the surface over a wide area.
On the other hand, a long wiper blade is required to wipe a wiping surface having a length in the vehicle front-rear direction longer than that in the vehicle width direction over a wide range. However, when the wiper blade is long, it is difficult to dispose the wiper blade along the edge of the wiping surface at the stop position.

Therefore, in the wiper device of the present invention, in order to wipe the wiping surface, in addition to the wiper blade, a sub blade is provided on the base end side in the longitudinal direction of the wiper blade so that the longitudinal axis forms an obtuse angle at the stop position. Arranged in a bent state.
Thus, in the present invention, by providing the sub blade in addition to the wiper blade, the blade length can be increased as a whole by the wiper blade and the sub blade, and the longitudinal wiping surface having a long length in the vehicle front-rear direction is provided. Wiping in a wide range is possible.

  In the present invention, the wiper blade and the sub-blade are bent at the stop position and arranged in an apparently short positional relationship so that they can be arranged along the edge of the wiping surface as a whole. Thus, the appearance of the wiper device at the stop position can be improved. Then, the wiper arm changes its posture along with the rotation of the main arm, etc., so that the wiping range can be expanded if the wiper blade and the sub-blade have a long positional relationship during wiping. .

In the present invention, it is preferable that the second rotation shaft has a radial distance between a tip end portion of the wiper blade and the first rotation shaft at a predetermined angular position between the stop position and the reverse position. The position is set with respect to the first rotation axis so as to be maximized.
In the present invention configured as described above, by setting the predetermined angular position to, for example, an angular position at which the main arm faces the corner of the wiping surface, it is possible to reduce a remaining area of wiping generated at the corner of the wiping surface. it can.

In the present invention, it is preferable that the sub blade is provided on the main arm or the sub arm so that a part of the wiping region overlaps the wiping region of the wiper blade.
In the present invention configured as described above, an unwiped area does not occur between the wiper blade and the sub blade, so that a good wiping pattern as a whole can be ensured.

  According to the present invention, in the pantograph-type wiper device having the main arm and the sub arm, in addition to the wiper blade, the sub blade independent of the wiper blade is provided on the main arm or the sub arm, so that the glass surface is wiped over a wide range. In addition, since they are arranged in a bent state at the stop position, the wiper blade and the sub blade can be arranged along the convex shape of the lower edge of the glass surface, and the appearance can be improved.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The members, arrangements, and the like described below are not intended to limit the present invention and can be variously modified within the scope of the gist of the present invention.
1 to 5 relate to an embodiment of the present invention, FIG. 1 is an explanatory view showing a state in which the wiper device is stopped at a stop position, and FIG. 2 is a front view of the wiper device of FIG. 3 is a side view of the wiper device of FIG. 1, FIG. 4 is an operation explanatory view of the wiper device of FIG. 1, and FIG. 5 is an explanatory view showing a wiping region of the wiper device of FIG. FIG. 6 is a front view of a wiper device according to another embodiment of the present invention.

  FIG. 1 is an external view of a vehicle wiper device W according to an embodiment of the present invention as viewed from the front of the vehicle. The vehicle in this example is a right-hand drive vehicle, and the wiper device W is mounted mainly for reciprocating the surface of the front window glass 1 (hereinafter referred to as “glass 1”) on the passenger seat side. The wiper device 2 is mainly used for reciprocating the surface of the glass 1 on the driver's seat side, and a general wiper device is used.

As shown in FIG. 1, the wiper device W of this example is a pantograph type, and includes a main arm 10, a sub arm 20, a connecting member 30, a wiper blade 40, and a sub blade 50 as main components.
A thin plate-like base member 5 is fixed below the center of the glass 1 in the vehicle width direction. The base member 5 fixed to the vehicle rotatably supports a pivot shaft (first rotation shaft) 3 that protrudes from the inside of the vehicle to the outside of the vehicle. A main arm 10 is fixed to the tip of the pivot shaft 3, and the main arm 10 rotates integrally with the pivot shaft 3 as the pivot shaft 3 reciprocates.

The base member 5 is provided with a support shaft (second rotation shaft) 4 that is rotatable in the vicinity of the pivot shaft 3 and at a position different from the pivot shaft 3. The sub arm 20 is pivotally supported by the support shaft 4 and can rotate about the support shaft 4.
The connecting member 30 is rotatably connected to the distal ends of the main arm 10 and the sub arm 20 via a pivot (first pivot) 31 and a pivot (second pivot) 32 (see FIG. 2). The pivot shaft 3, the support shaft 4, and the pivot shafts 31 and 32 are substantially parallel in the axial direction, and the main arm 10, the base member 5, the sub arm 20, and the connecting member 30 constitute a pantograph mechanism.

The wiper blade 40 is attached to the connecting member 30. Further, the sub blade 50 is connected to the main arm 10 so as to be positioned closer to the pivot shaft 3 than the wiper blade 40.
In FIG. 1, the wiper device W is stopped at the stop position (first reversal position), and the wiper blade 40 and the sub blade 50 are arranged along the shape of the lower edge of the glass 1, respectively. Yes.

Next, the configuration of the wiper apparatus W of this example will be described in more detail with reference to FIGS.
The base member 5 is attached to the vehicle with the pivot shaft 3 penetrating from the inside of the vehicle to the outside of the vehicle. The base end portion of the main arm 10 is fastened to the distal end of the pivot shaft 3 with a nut 3a.
The main arm 10 includes a substantially L-shaped arm head 12, a retainer 14, and an arm piece 16. The arm head 12 has a base end fixed to the pivot shaft 3 with a nut 3a, and a direction from the pivot shaft 3 to a reverse position (second reverse position) outside the figure (reverse position direction A in FIG. 2). After extending in the opposite direction (stop position direction B in FIG. 2), it is bent in an L shape.

  The retainer 14 is a member having a substantially U-shaped cross section, and a base end portion of the retainer 14 is rotatably connected to a distal end portion of the arm head 12 by a connecting pin 13. Thereby, the retainer 14 can be rotated in the contact / separation direction (D direction in FIG. 3) with respect to the glass surface 1, and follows the curved shape of the glass surface 1 during the reciprocating wiping operation. Can be rotated. In addition, when the vehicle is washed, the retainer 14 can be locked back by rotating in the standing direction.

In the retainer 14, the distal end portion 14b is bent at a predetermined angle from the distal end side of the retainer main body portion 14a to the sub arm 20 side, and extends linearly. The arm piece 16 is fixed by caulking so as to protrude from both sides in the longitudinal direction of the distal end portion 14 b of the retainer 14.
The arm piece 16 has an extension portion 16 a extending further from the distal end portion 14 b of the retainer 14 toward the distal end side. The extension part 16a is attached to the connecting member 30 by a pivot 31 so that its tip end part is pivotable.

  On the other hand, the extension part 16b of the arm piece 16 extends from the distal end portion 14b of the retainer 14 to the proximal end side. The extension part 16b is bent toward the glass 1 surface side, bent toward the retainer 14 side in the middle, and further extends linearly. The extension portion 16b has a blade attachment portion (hook) 16c formed at the tip thereof. The sub blade 50 is attached to the arm piece 16 by attaching the blade attaching portion 16c to the connecting pin 51, and can be rotated in a predetermined angle range in the direction E of FIG. Yes. When the sub blade 50 is attached to the arm piece 16, the sub blade 50 intersects the retainer 14 below the retainer 14 (on the glass 1 surface side).

As the sub blade 50, a general linear tournament type wiper blade is used, and in this example, the same one as the wiper blade 40 is used.
As described above, since the sub blade 50 is attached to the extended portion 16b of the bent arm piece 16, the longitudinal axis 50a and the extending direction C of the retainer main body portion 14a form a predetermined angle. Yes. Specifically, the sub blade 50 is attached to the arm piece 16 in a state where the tip end side is inclined in the stop position direction B with respect to the extending direction C of the retainer main body portion 14a.
In this example, the sub blade 50 can be disposed along the lower edge portion of the glass 1 at the stop position by appropriately setting the inclination angle.

  The sub arm 20 includes a support portion 22, a retainer 24, and an arm piece 26. The support portion 22 is attached to be rotatable about the support shaft 4. A retainer 24 having a substantially U-shaped cross section is connected to the distal end portion of the support portion 22 by a connecting pin 23 so as to be rotatable. As a result, the retainer 24 can rotate in the contact / separation direction (D direction in FIG. 3) with respect to the glass 1 surface, similarly to the retainer 14, and follows the curved shape of the glass 1 surface during the reciprocating wiping operation. Then, it can be rotated in the glass surface contacting / separating direction D. In addition, when the vehicle is washed, the retainer 24 can be locked back by rotating in the standing direction.

  An arm piece 26, which is a linear member, is riveted to the retainer 24 so as to further extend from the retainer 24 to the distal end side. The support portion 22, the retainer 24, and the arm piece 26 are linearly connected, and the sub arm 20 of this example constitutes a linear member as a whole. The arm piece 26 is pivotally attached to the connecting member 30 by a pivot 32 at its distal end. With this configuration, the sub arm 20 is disposed substantially parallel to the retainer main body portion 14a of the main arm 10 on the reverse position direction A side.

  The connecting member 30 includes a thin plate-like attachment portion 33 for attaching the pivot shafts 31 and 32, and an extension portion 34 extending from the attachment portion 33. The pivot 31 is located closer to the stop position direction B than the pivot 32 in the mounting portion 33. The extension part 34 extends downward (from the glass 1 surface side) to the stop position direction B from the end of the attachment part 33 on the stop position direction B side, and further in a substantially L shape in a direction away from the pivot shaft 3. After bending, it extends linearly. A blade attachment portion (hook) 35 for attaching the wiper blade 40 is formed at the tip of the linearly extending portion. The wiper blade 40 is attached to the connecting member 30 by attaching the blade attaching portion 35 to the connecting pin 41, and can be rotated around the connecting pin 41 in the direction F in FIG. Yes.

As shown in FIG. 2, at the stop position, the longitudinal axis 40 a of the wiper blade 40 is substantially parallel to the extending direction of the extending portion 16 a of the arm piece 16 and the distal end portion 14 b of the retainer 14. Therefore, at the stop position, the wiper blade 40 is in a state in which the distal end side is inclined in the reverse position direction A so that the longitudinal axis 40a forms a predetermined angle with the extending direction of the sub arm 20.
In this example, the wiper blade 40 can be disposed along the lower edge of the glass 1 at the stop position by appropriately setting the inclination angle.

With the above configuration, at the stop position, the wiper blade 40 is disposed in a state where the tip end side is inclined in the reverse position direction A with respect to the extending direction C of the retainer body 14a of the main arm 10, and the sub blade 50 is It is arranged in a state where the tip side is inclined in the stop position direction B.
Therefore, the angle θ formed by the longitudinal axis 40a of the wiper blade 40 and the longitudinal axis 50a of the sub blade 50 is not parallel but an obtuse angle of 180 degrees or less, and the wiper blade 40 and the sub blade 50 are bent. Has been placed.

  Thus, since the wiper blade 40 and the sub blade 50 are arranged in a bent state, they can be arranged along the curved shape of the lower edge portion of the glass 1. And by arranging the wiper blade 40 and the sub-blade 50 along the curved shape of the lower edge portion of the glass 1, it is possible to arrange them as a whole at a low position on the surface of the glass 1, so that the appearance is good. can do.

  Further, with this configuration, in particular, when the wiper device W is applied to a vehicle in which the length of the glass 1 in the longitudinal direction (vehicle longitudinal direction) is set to be long, the wiper blade 40 and the sub blade 50 are substantially used. In addition, since a long blade length can be ensured, a sufficiently wide wiping range can be ensured without wiping off the upper and lower areas of the glass 1 surface. Further, by arranging the wiper blade 40 and the sub blade 50 in a bent state at the stop position, they can be stopped along the lower edge of the glass 1.

  Further, in this example, the wiper blade 40 and the sub blade 50 are arranged so that a part of the wiping area overlaps. Specifically, the area to be wiped on the base end side of the wiper blade 40 and the area to be wiped on the front end side of the sub blade 50 overlap. As a result, an unwiped area does not occur near the center of the glass 1.

  Further, in this example, since the wiper blade 40 and the sub blade 50 can be independently rotated around the connecting pins 41 and 51, when the wiper device W operates to wipe the glass 1 surface back and forth, The wiper blade 40 and the sub-blade 50 follow the curved shape of the glass 1 whose center in the vehicle width direction protrudes forward of the vehicle, and can wipe the surfaces of the wiper blade 40 without causing uneven wiping or unwiping. .

Next, based on FIG. 4, FIG. 5, operation | movement of the wiper apparatus W of this example is demonstrated.
The wiper device W is configured to reciprocate and wipe the surface of the glass 1 by operating a wiper motor (not shown) disposed in the vehicle and reciprocatingly rotating the pivot shaft 3. The wiper device W wipes back and forth between the stop position shown in FIG. 4 (position (a) in FIG. 4) and the reverse position (position (c) in FIG. 4).
When the wiper device W is actuated, the sub blade 50 is fixed to the main arm 10 and thus performs a substantially arc-shaped wiping operation with the pivot shaft 3 as the center of rotation. On the other hand, the wiper blade 40 performs a substantially arc-shaped wiping operation on the radially outer side of the wiping range of the sub blade 50.

  When the wiper device W performs a reciprocating wiping operation between the stop position (a) and the reverse position (c), the main arm 10, the base member 5, the sub arm 20, and the connecting member 30 constitute a pantograph mechanism as described above. Therefore, the connecting member 30 moves while displacing the relative posture (relative angle) between the main arm 10 and the sub arm 20. Since the wiper blade 40 is fixed to the connecting member 30, the wiper blade 40 also moves while changing the posture (angle) with respect to the main arm 10 and the sub arm 20.

  That is, the angle formed by the longitudinal axis of the wiper blade 40 and the longitudinal axis of the sub arm 20 is displaced with the movement of the wiper device W, but is the angle θa at the stop position (a) and the angle θc at the reverse position (c). These are at substantially the same angle. In this example, this angle becomes the minimum angle θb at the midway position (b), and the wiper blade 40 and the sub arm 20 are closest to each other in parallel.

Therefore, the radial distance between the tip of the wiper blade 40 and the pivot shaft 3 is maximized at the intermediate position (b), and the wiping radius is expanded most. In this example, the position of the support shaft 4 with respect to the pivot shaft 3 and the positions of the pivot shafts 31 and 32 in the connecting member 30 are set so that the wiping radius is maximized at the intermediate position (b). Specifically, the support shaft 4 is positioned so that the pivot shaft 3, the support shaft 4, and the sub arm 20 are linear in the vicinity of the intermediate position (b).
And in this example, this halfway position (b) is set in the vicinity of the angular position where the longitudinal extension direction of the main arm 10 and the sub-arm 20 faces the upper left corner of the glass 1, and the unwiped area at the corner is Has been reduced.

A curve T1 (dashed line) in FIG. 4 indicates the locus of the tip of the wiper blade 40. On the other hand, a curved line T2 (broken line) is an arc locus when the distance between the pivot shaft 3 and the tip of the wiper blade 40 at the stop position (a) is a radius with the pivot shaft 3 as the center. From FIG. 4, it can be seen that the curve T1 is located radially outside the curve T2, and the wiping range is expanded.
Thus, in the wiper apparatus W of this example, the wiper blade 40 is displaced so as to be closest to the main arm 10 and the sub arm 20 at the midway position (b), so that the wiping range is near the midway position (b). Swells radially outward. Thereby, in this example, a large wiping range is secured.

Further, as described above, the wiper device W of the present example is mainly for wiping the front glass 1 surface. In general, the wiper device provided for wiping the front glass surface of the passenger seat is reversed in front of the driver's 6 field of view at the reversal position (c). That is, generally, the wiper blade is reversed at a position indicated by a straight line V (broken line) in FIG. For this reason, the driver 6 may be blocked from view.
On the other hand, in the wiper device W of this example, the wiper blade 40 and the sub blade 50 are bent so as to avoid the vicinity of the front of the head of the driver 6 at the reverse position (c). Visibility can be secured.

As shown in FIG. 5, the wiper device W wipes the wiping area P1 in a reciprocating manner. In addition, the wiping area | region P2 has mainly shown the wiping area | region of the wiper apparatus 2 for wiping the driver | operator side glass 1 surface.
Of the wiping area P1, the wiping area P11 by the wiper blade 40 is an area indicated by a one-dot chain line, and the wiping area P12 by the sub blade 50 is an area indicated by a two-dot chain line. The wiping areas P11 and P12 partially overlap with an arc-shaped wiping area P13 (shaded portion). As described above, in this example, the wiper blade is configured by the wiper blade 40 and the sub blade 50, but the areas to be wiped are overlapped so that no wiping residue is generated.

Next, another embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the same component as the said embodiment, and the overlapping description is abbreviate | omitted.
The wiper device W shown in FIG. 6 is an example in which the sub blade 50 is attached to the sub arm 20. In the example of FIG. 6, a blade attachment portion 52 is fixed to the arm piece 26 of the sub arm 20, and the sub blade 50 is rotatably attached to the blade attachment portion 52. The main arm 10 has a configuration in which an arm piece 116 shorter than the arm piece 16 is fixed to the retainer 14.

Also in this example, the sub-blade 50 extends in the extending direction C so that the longitudinal axis 50a of the sub-blade 50 and the extending direction C of the retainer body 14a (or the extending direction of the sub-arm 20) form a predetermined angle. On the other hand, it is attached to the arm piece 26 in a state where the tip side is inclined in the stop position direction B.
Also in this example, the sub blade 50 is attached to the arm piece 26 so that the wiping areas of the wiper blade 40 and the sub blade 50 partially overlap.
Thus, even if the sub blade 50 is attached to the sub arm 20, the same effect as that of the above embodiment can be obtained.

It is explanatory drawing which shows the state which the wiper apparatus which concerns on one Embodiment of this invention has stopped operation | movement at the stop position. It is a front view of the wiper apparatus of FIG. It is a side view of the wiper apparatus of FIG. It is operation | movement explanatory drawing of the wiper apparatus of FIG. It is explanatory drawing which shows the wiping area | region of the wiper apparatus of FIG. It is a front view of the wiper device concerning other embodiments of the present invention.

Explanation of symbols

1. Windshield glass, 2. Wiper device, 3. Pivot shaft (first rotation shaft),
3a ··· nut, 4 ··· support shaft (second rotation shaft), 5 · base member, 6 · driver,
10 ... main arm, 12 ... arm head, 13 ... connecting pin,
14... Retainer, 14 a... Retainer main body, 14 b.
16, 116 ... arm piece, 16a, 16b ... extension part, 16c ... blade attachment part,
20 ... sub arm, 22 ... support part, 23 ... connecting pin, 24 ... retainer,
26... Arm piece, 30 .. connecting member, 31 and 32... Pivot (first pivot and second pivot),
33 ... Mounting part, 34 ... Extension part, 35 ... Blade mounting part, 40 ... Wiper blade,
40a ··· Longitudinal axis, 41 ··· Connecting pin, 50 ··· Sub blade, 50a ··· Longitudinal axis,
51 ... Connecting pin, 52 ... Blade mounting part, W ... Wiper device

Claims (3)

A main arm attached to the first rotating shaft and rotating integrally with the first rotating shaft; a sub arm rotating around a second rotating shaft provided at a position different from the first rotating shaft; A connecting member rotatably connected to the main arm and the sub-arm via a first pivot and a second pivot, respectively, and a wiper blade connected to the connecting member, for rotating the main arm. A wiper device that wipes the wiping surface between the stop position and the reversal position while the wiper blade changes the posture with respect to the main arm.
The wiper blade is connected to the connecting member so as to follow the shape of the edge of the wiping surface at the stop position,
The main arm or the sub arm has a sub blade for wiping the wiping surface so that it follows the shape of the edge of the wiping surface on the base end side in the longitudinal direction of the wiper blade at the stop position. A wiper device characterized in that a longitudinal axis is disposed at an obtuse angle with respect to the longitudinal axis of the wiper blade.   The second rotation shaft is configured so that a radial distance between a tip end portion of the wiper blade and the first rotation shaft is maximum at a predetermined angular position between the stop position and the reverse position. The wiper device according to claim 1, wherein the position is set with respect to one rotation axis. 3. The wiper device according to claim 1, wherein the sub blade is provided on the main arm or the sub arm so that a part of the wiping area of the sub blade overlaps with the wiping area of the wiper blade.

Images