JP2002362329A - Wiper blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressing force distribution of a blade rubber corresponding to a multiplicity of glass surfaces with different curvatures by setting of a few types of backing members. SOLUTION: In the wiper blade 10, a first backing member 32 and a second backing member 34 are respectively inserted and held in holding grooves 28 and 30 provided on a holding part 24 of the wiper rubber 12. The first backing member 32 and the second backing member 34 elastically deform pressing force from the wiper arm and distribute it in a longitudinal direction of the blade rubber 12. By suitably selecting and combining the first backing member 32 and the second backing member 34 from a plurality of backing members with respectively different longitudinal curvatures, a pressing force distribution substantially uniform in a longitudinal direction of the wiper blade 10 can be provided to the multiplicity of glass surfaces with respectively different curvatures.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a wiper blade for wiping a surface to be wiped such as a windshield glass of a vehicle.

[0002]

2. Description of the Related Art On a wiper blade of a vehicle wiper device, a backing for supporting a blade rubber for wiping a glass surface of a vehicle in a longitudinal direction is formed so as to be elastically deformable in a longitudinal direction, and is formed from a wiper arm. There has been proposed a configuration in which a backing is elastically deformed in a bending direction corresponding to a glass surface by a pressing force, and the pressing force is distributed in a longitudinal direction of the blade rubber so that the blade rubber follows the curvature of the glass surface ( As an example, WO99 / 5
1470).

In such a wiper blade, a pressing force distribution of the blade rubber corresponding to the glass surface to be wiped by the blade rubber can be obtained according to the curved shape and elasticity of the backing. Therefore, there is no need to provide a lever assembly composed of a plurality of levers, and the size of the wiper blade in the height direction is reduced, so that the driver's view can be secured well.

[0004]

Generally, the glass surface of a vehicle is formed of a complicated curved surface, and a substantially uniform pressing force distribution is obtained in the longitudinal direction of the blade rubber corresponding to the glass surface (blade). In order to make the rubber follow the glass surface), in the wiper blade described above, the backing is formed in a curved shape having a plurality of curvatures in the longitudinal direction. That is, for example, the backing has different curvatures at the center in the longitudinal direction and at both ends.

However, in such a conventional wiper blade, the blade rubber follows the glass surface with one backing (backing member).
In order to cope with different curvatures of the glass surface for each vehicle type and each vehicle specification, a dedicated backing was required for each vehicle type and each specification. For this reason, a large number of backings having different curvatures must be set in accordance with a large number of vehicle types and specifications, which has led to complicated parts management and high costs.

The present invention has been made in view of the above circumstances, and has as its object to obtain a wiper blade capable of obtaining a pressing force distribution of blade rubber corresponding to many glass surfaces having different curvatures by setting a small number of types of backing members. It is.

[0007]

According to a first aspect of the present invention, there is provided a wiper blade rotatably supported by a tip of a wiper arm and capable of wiping a glass surface of a vehicle. A blade rubber and a backing held along the longitudinal direction of the blade rubber are provided, and the pressing force from the wiper arm acting on the position supported by the wiper arm is distributed in the longitudinal direction of the blade rubber by the backing. In the wiper blade for wiping the glass surface, the backing is
It is configured by combining a plurality of backing members including a backing member formed by being curved in the longitudinal direction in a natural state, and is elastically deformed in the bending direction corresponding to the glass surface by the pressing force, I have.

According to the wiper blade of the first aspect, the backing is elastically deformed in a curved direction corresponding to the glass surface by the pressing force from the wiper arm acting on the position supported by the wiper arm, and the pressing force is applied to the longitudinal direction of the blade rubber. The glass surface of the vehicle is wiped while being distributed in the direction.

In particular, since the backing includes a backing member curved in a natural state and is elastically deformed in the bending direction by the pressing force, the pressing force in the longitudinal direction of the blade rubber in accordance with the elastic characteristic of the backing. Distribution can be set. That is, since a predetermined pressing force acting on a specific portion in the longitudinal direction of the blade rubber can be set according to the elastic characteristic of the backing, the blade rubber follows the glass surface with an appropriate pressing force distribution corresponding to the glass surface. Therefore, for example, even on a glass surface having a large curvature, a substantially uniform pressing force distribution can be obtained (set) in the longitudinal direction of the blade rubber, and the blade rubber can be satisfactorily applied to the glass surface over the entire length in the longitudinal direction. The state of contact is maintained.

Here, the backing is constituted by combining a plurality of backing members including a backing member curved in the longitudinal direction. In other words, at least one of the plurality of backing members is in a natural state. In this case, the elasticity of the backing can be changed by changing the combination of the plurality of backing members. That is, by changing the combination of the plurality of backing members according to the curvature of the glass surface, a pressing force distribution in the longitudinal direction of the blade rubber corresponding to the glass surface can be obtained.

As a result, a large number of pressing force distributions corresponding to a large number of vehicle types and specifications can be handled by a small number of types of backing members. As compared with the configuration in which the backing member is set, the setting of the backing member (the type of the backing member having different elastic characteristics) can be reduced, the labor for parts management is reduced, and the cost is reduced.

The combination of a plurality of backing members constituting the backing includes a combination of backing members having different elastic characteristics in the longitudinal direction, a combination of backing members having the same elastic characteristics, and the elasticity of some backing members. It goes without saying that all combinations such as combinations having different characteristics are included.

[0013] The difference in the elastic characteristics includes a configuration in which the curved shapes in the longitudinal direction in the natural state are different from each other, and a configuration in which different pressing force distributions are applied to the blade rubber even if they have the same shape (for example, a plurality of the same configurations). The backing member having a curved shape is made of a different material or a different thickness and includes a blade rubber which is an elastic member and gives a different curvature to the blade lever in a holding state. Further, a part of the plurality of backing members is not limited to a configuration curved in the longitudinal direction in a natural state, and may be partially or entirely linear in a natural state.

As described above, in the wiper blade according to the first aspect, it is possible to obtain the distribution of the pressing force of the blade rubber corresponding to the many glass surfaces having different curvatures by setting a small number of types of backing members.

A wiper blade according to a second aspect of the present invention is the wiper blade according to the first aspect, wherein each of the backings is formed to be curved in the longitudinal direction, and the first backing member has different curvatures in a natural state. And a second backing member.

In the wiper blade according to the second aspect, since the backing is constituted by the first backing member and the second backing member which are curved in the longitudinal direction and have different curvatures, the first backing member and the second backing member. Complement each other with the pressing force distribution according to the curvature of the glass surface of the blade rubber, whereby the pressing force distribution of the blade rubber corresponding to the glass surface can be obtained. That is, it is possible to obtain a pressing force distribution corresponding to the glass surface 20 having various curvatures according to the combination.

Further, since the number of backing members constituting the backing is two, a simple holding structure of the first backing member, the second backing member and the blade rubber, and a large number of the above-mentioned pressing force distributions by a small number of backing members. Can be obtained.

A wiper blade according to a third aspect of the present invention is the wiper blade according to the second aspect, wherein
The backing member and the second backing member are respectively formed symmetrically with respect to the central portion in the longitudinal direction, and are characterized in that at least both ends have different curvatures.

In the wiper blade according to the third aspect, the first
Since the backing member and the second backing member are respectively formed symmetrically with respect to the central portion in the longitudinal direction and the curvatures at both ends are different from each other, for example, a blade rubber that cannot follow the glass surface with the first backing member can be used. By supplementing the pressing force distribution with the second backing member, it is possible to obtain the pressing force distribution of the blade rubber corresponding to the glass surfaces having different curvatures.

The wiper blade according to a fourth aspect of the present invention is the wiper blade according to the second aspect, wherein
The backing member is formed symmetrically with respect to the center in the longitudinal direction, and the second backing member is formed with one end having a greater curvature than the other end with respect to the center in the longitudinal direction. , Is characterized.

In the wiper blade according to the fourth aspect, the second
Since one end of the backing member has a larger curvature than the other end, the pressing force of the glass surface at the end of the blade rubber corresponding to the one end of the second backing member can be increased. Thus, for example, in the configuration in which the wiper blade is connected (supported) to the wiper arm at the center in the longitudinal direction, the pressing force at the blade rubber end where the pressing force tends to be small can be appropriately set.

A wiper blade according to a fifth aspect of the present invention is the wiper blade according to the fourth aspect, wherein
The backing member is characterized in that the one end is set on the tip side of the blade rubber.

[0023] In the wiper blade according to the fifth aspect, in the configuration in which one end of the second backing member is a tip end side of a blade rubber (wiper blade) (for example, a wiper arm is swung to wipe a glass surface, (A side where a large arc is drawn along with the swing), so that a favorable pressing force distribution can be obtained even on a glass surface having a curved surface with a large curvature at both sides.

A wiper blade according to a sixth aspect of the present invention is the wiper blade according to the second aspect, wherein the first
The backing member is formed such that the end on the tip end side of the blade rubber has a larger curvature than the other end with respect to the center in the longitudinal direction, and the second backing member is formed with respect to the center in the longitudinal direction. The end of the blade rubber on the tip end side has a smaller curvature than the other end,
It is characterized by:

In the wiper blade according to the sixth aspect, the first backing member and the second backing member, which are formed asymmetrically with respect to the center in the longitudinal direction, are arranged opposite to each other. The pressing force on the glass surface can be increased. Thus, for example, in a configuration in which the wiper blade is connected (supported) to the wiper arm at the center in the longitudinal direction, the pressing force at both ends of the blade rubber where the pressing force tends to be small can be appropriately set.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A wiper blade 10 according to an embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a perspective view showing the overall structure of the wiper blade 10. As shown in FIG. FIG. 2 shows 2-2 of FIG.
A cross-sectional view along the line is shown, and FIG.
0 is shown.

As shown in these figures, the wiper blade 10 includes an elongated blade rubber 12 and a backing 14 held on the blade rubber 12 along its longitudinal direction. And the backing 14 is connected to the wiper arm 18 by the holding connection 16.
Is rotatably attached to the tip of the. In the following description, one end of the wiper blade 10 on the side where the wiper arm 18 is supported by the vehicle (right side in FIG. 1) is referred to as the base end of the wiper blade 10, and the other end of the wiper blade 10 is referred to as the wiper blade. It is assumed to be 10 tips.

The blade rubber 12 has a wiping portion (lip portion) 22 having a substantially inverted triangular cross-sectional shape for wiping a glass surface 20 (see FIG. 3) of the windshield glass of the vehicle, and a backing provided above the wiping portion 22. And a neck portion 26 that connects the wiping portion 22 and the holding portion 24 and elastically deforms in the falling direction when the glass surface 20 is wiped.
Are integrally formed.

On both sides of the holding portion 24, holding grooves 28 and 30 are provided, each extending in the longitudinal direction along the longitudinal direction of the blade rubber 12. The holding grooves 28, 30
Each is opened at the side of the holding part 24, and the groove wall faces the glass surface 20 in a state of being attached to the wiper arm 18. Further, sealing portions 3 for sealing the holding grooves 28 and 30 are provided at both ends (a base end and a front end) of the holding portion 24.
1 are integrally formed to prevent a first backing member 32 and a second backing member 34 described below from falling off in the longitudinal direction.

A first backing member 32 and a second backing member 34 constituting the backing 14 are inserted and held in the holding grooves 28 and 30, respectively. The first backing member 32 and the second backing member 34 are formed of a long plate material of metal or resin elongated in the longitudinal direction of the blade rubber 12 and formed by being naturally curved in the longitudinal direction. And is elastically deformable in the bending direction (the thickness direction).

Specifically, the first backing member 32 and the second backing member 34 are, for example, four typical backing members 36, 38, 40, 4 as shown in FIG.
The backing 14 is appropriately selected and combined from the two.

The backing member 36 is formed so as to be curved substantially symmetrically with respect to the central portion in the longitudinal direction, and the radius of curvature Rm1 at the central portion in the longitudinal direction has a radius of curvature Rm at both ends (base end and distal end).
2 (the curvature at the center in the longitudinal direction is the maximum curvature).

The backing member 38 is formed to be curved substantially symmetrically with respect to the central portion in the longitudinal direction, the radius of curvature Rn1 at the central portion in the longitudinal direction is smaller than the radius of curvature Rn2 at both ends.
In addition, the radii of curvature Rn1 and Rn2 are smaller than the radii of curvature Rm1 and Rm2 of the backing member 36 (the curvature of each part is larger than the curvature of the corresponding position of the backing member 36).

The backing member 40 is formed to be asymmetrically curved with respect to the central portion in the longitudinal direction, and is located at a point where the radius of curvature giving the maximum curvature is Rx1 on the base end side with respect to the central portion in the longitudinal direction. Further, the backing member 40 is configured such that the curvature radius Rx2 on the base end side is smaller than the curvature radius Rx3 on the front end side (the curvature on the base end side is larger) than the point of the maximum curvature.

The backing member 42 is formed so as to correspond to an asymmetric shape obtained by inverting the backing member 40 with respect to the central portion in the longitudinal direction, and has a radius of curvature Ry1 (= Rx1) that gives the maximum curvature to the tip side from the central portion in the longitudinal direction. ) Is located. In addition, the backing member 42 has a radius of curvature Ry2 (= Rx
3) is larger than the radius of curvature Ry3 (= Rx2) on the front end side (the curvature on the front end side is large).

These backing members 36, 38, 4
Reference numerals 0 and 42 denote holding grooves 28 and 30 of the blade rubber 12 as the first backing member 32 and the second backing member 34, respectively.
When it is inserted and held, its longitudinal curvature (elasticity)
The blade rubber 12 is bent in the longitudinal direction in accordance with the above, and the pressing force P (see FIG. 3) from the wiper arm 18 is distributed in the longitudinal direction of the blade rubber 12 while the blade rubber 1 is bent.
2 is made to follow the curvature of the glass surface 20.

That is, unlike the so-called tournament type wiper blade, the wiper blade 10 does not include a lever assembly including a plurality of levers for causing the blade rubber 12 to follow the glass surface 20. The distribution state of the pressing force P will be described in detail in the description of the operation of the wiper blade 10 described later.

As shown in FIG. 5, the first backing member 32 and the second backing member 34 (that is, the backing members 36, 38, 40, and 42) each extend in the width direction at the central portion in the longitudinal direction. Fitted holding portions 32A and 34A which are provided wide portions are formed. The first holding member 32 and the second backing member 34 are provided in the holding grooves 2 </ b> A of the blade rubber 12.
It is projected from the holding grooves 28, 30 in a state of being inserted and held in the holes 8, 30, and is used for holding by the holding connecting portion 16.

The holding connection 16 has a holder member 44. The holder member 44 is configured to hold the wiper blade 1 in plan view.
"U" -shaped arm connecting portion 4 having an open base end
6 and a substantially “U” -shaped block holding portion 48 whose lower part is opened when viewed from the longitudinal direction of the wiper blade 10 are configured to share a leg piece. The holder member 44 has a pin hole 5 that penetrates the three leg pieces 49A, 49B, and 49C in a straight line perpendicular to the longitudinal direction of the wiper blade 10.
0 is provided.

The block holding portion 48 of the holder member 44
Holds a pair of holding blocks 52 and 54. In the holding blocks 52 and 54, the backing holding grooves 52B and 54B are attached to the legs 52A and 54A facing each other on the outside in the width direction of the holding portion 24 of the blade rubber 12 in the assembled state.
The backing holding grooves 52B, 54
B, the first backing member 32 and the second backing member 3
Four fitting holding portions 32A and 34A are fitted and held.
A pin hole 50 is provided in the pair of holding blocks 52 and 54.
Mounting holes 56, 5 larger in diameter than the pin holes 50 at positions corresponding to
A cylindrical collar 60 is fitted in the mounting holes 56 and 58.

In this state, the connecting pin 62 is inserted into the pin hole 50 and the collar 60 in a state where the connecting pin 62 is prevented from coming off, and a portion of the connecting pin 62 located in the arm connecting portion 46 (not shown) has a clip structure (not shown). For example, JIS D57
The tip of the wiper arm 18 is connected by a U-hook type clip structure specified in FIG. This allows
The wiper blade 10 has a central portion in the longitudinal direction,
The base end or the tip is the glass surface 2 with respect to the wiper arm 18.
It is supported so as to be rotatable in the direction approaching and separating from zero.

Next, the operation of this embodiment will be described.

In the wiper blade 10 having the above-described configuration, the pressing force P transmitted from the wiper arm 18 is distributed in the longitudinal direction of the blade rubber 12 by the elastic deformation of the backing 14, and the wiper arm 18 swings along the glass surface 20. The wiping unit 22 of the blade rubber 12 wipes the glass surface 20 with the movement. As a result, raindrops, rainwater, cleaning liquid, and the like attached to the glass surface 20 are removed, and the visibility of the driver or the like is secured.

At this time, in order to satisfactorily wipe the glass surface 20 over the entire length in the longitudinal direction from the base end to the tip end of the wiper blade 10, the pressing force and the wiper as shown in the diagram of FIG. It is preferable that the relationship (pressure distribution) with the position in the longitudinal direction of the blade 10 is obtained.
That is, it is desirable that the pressing force P be distributed substantially uniformly to the glass surface 20 at each position in the longitudinal direction of the wiper blade 10.

In the wiper blade 10 according to the present embodiment, the first backing member 3 is formed in accordance with the curvature of the glass surface 20 of the windshield glass which differs for each vehicle type or specification.
2, by appropriately changing the combination of the second backing member 34,
The pressing force P can be distributed substantially evenly on the glass surface 20 having various curvatures (the blade rubber 12 of the wiper blade 10 follows the glass surface 20).

The distribution of the pressing force P according to an example of the combination of the various backing members 36, 38, 40, 42 will be described below with reference to FIGS. 6B and 6C. FIG. 6 (B),
FIG. 6C shows a state in which the wiper blade 10 is positioned at the center in the longitudinal direction with respect to the plane (the tip end of the wiper arm 18 is the holding connecting portion 1).
6 shows a distribution of the pressing force from the base end to the tip end of the wiper blade 10 when pressed at a constant pressing force P at a portion connected through the base 6.

The pressing force distribution curve A shown in FIG.
The first backing member 32 and the second backing member 3
4 shows the pressing force distribution when the backing member 36 is selected. The pressing force distribution curve A shows a substantially uniform distribution of the pressing force with respect to the plane at each point in the longitudinal direction, and fits the glass surface 20 having a small curvature over substantially the entire surface wiped by the wiper blade 10.

That is, the wiper blade 10 in which the backing member 36 has been selected for both the first backing member 32 and the second backing member 34 has the glass surface 2 having a small curvature.
The blade rubber 12 can be made to follow with an appropriate pressing force against zero.

The pressing force distribution curve B shown in FIG.
The first backing member 32 and the second backing member 3
4 shows the pressing force distribution when the backing member 38 is selected. The pressing force distribution curve B shows a distribution in which the pressing force with respect to the plane is small at the center in the longitudinal direction and large at the base end and the tip end, and the glass surface where the curvature is increased at the upper, lower and side portions of the windshield glass 2
Matches 0.

That is, the wiper blade 10 in which the backing member 38 is selected for both the first backing member 32 and the second backing member 34 is applied to the glass surface 20 where the curvature is increased at the upper, lower and side portions of the windshield glass. On the other hand, the blade rubber 12 can be made to follow with an appropriate pressing force.

A pressing force distribution curve C shown in FIG.
The first backing member 32 and the second backing member 3
4 shows a pressing force distribution when the backing member 36 is selected for one of the four and the backing member 38 is selected for the other. Accordingly, the pressing force distribution curve C indicates the pressing force distribution with respect to a plane intermediate between the pressing force distributions indicated by the pressing force distribution curve A and the pressing force distribution curve B, and the glass surface to which the pressing force distribution curve A conforms. 20 and pressing force distribution curve C
Conforms to a glass surface 20 having an intermediate curvature with respect to the conforming glass surface 20.

That is, the backing member 3 is attached to one of the first backing member 32 and the second backing member 34.
6 and the backing member 38 selected on the other hand, the wiper blade 10 has the glass surface 20 to which the pressing force distribution curve A conforms and the glass surface 2 to which the pressing force distribution curve C conforms.
The backing member 36 cannot follow the glass surface 20 having a curvature intermediate between zero and zero.
The pressing force distribution of the blade rubber 12 corresponding to the glass surface 20 can be obtained by supplementing the pressing force distribution of the blade rubber 12 with the backing member 38 (the blade rubber 12 follows the glass surface 20 over the entire length in the longitudinal direction). be able to).

On the other hand, the pressing force distribution curve D shown in FIG. 6 (C) shows that the backing member 36 is selected as one of the first backing member 32 and the second backing member 34 and the backing member 40 is selected as the other. The pressing force distribution in the case where the pressure is applied is shown. The pressing force distribution curve D indicates that the pressing force against the plane is large at the base end and is substantially uniform from the longitudinal center to the tip, and the pressing force distribution curve D is at the bottom of the windshield glass to be wiped by the base end of the wiper blade 10. Fits the glass surface 20 with a large curvature.

That is, the backing member 3 is attached to one of the first backing member 32 and the second backing member 34.
6 and the backing member 40 selected on the other side, the backing member 36 follows the glass surface 20 whose curvature is increased below the windshield glass to be wiped by the base end of the wiper blade 10. By compensating for the pressing force distribution on the proximal end that cannot be completed by the backing member 40 having a large curvature on the proximal end,
The blade rubber 12 can follow the glass surface 20 over the entire length in the longitudinal direction.

The pressing force distribution curve E shown in FIG.
The first backing member 32 and the second backing member 3
4 shows the pressing force distribution when the backing member 36 is selected for one of the four and the backing member 42 is selected for the other. The pressing force distribution curve E indicates that the pressing force against the plane is substantially uniform from the base end side to the center in the longitudinal direction and has a large distribution at the distal end side, and the upper part of the windshield glass wiped by the distal end side of the wiper blade 10 and It fits the glass surface 20 whose curvature is increased at the side.

That is, the backing member 3 is attached to one of the first backing member 32 and the second backing member 34.
6 and the backing member 42 selected on the other side, the backing member 36 with respect to the glass surface 20 whose curvature is increased at the upper and side portions of the windshield glass to be wiped by the tip side of the wiper blade 10. By compensating the pressing force distribution on the front end side that cannot be followed by the backing member 42 having a large curvature on the front end side, the blade rubber 12 can follow the glass surface 20 over the entire length in the longitudinal direction.

The pressing force distribution curve F shown in FIG.
The first backing member 32 and the second backing member 3
4 shows the pressing force distribution when the backing member 40 is selected for one of the four and the backing member 42 is selected for the other. The pressing force distribution curve F shows a distribution in which the pressing force against the plane is increased at the center in the longitudinal direction and particularly increased at the base end and the distal end side, and has a large curvature as a whole, and particularly the upper and lower portions of the windshield glass. In addition, it is suitable for the glass surface 20 having a particularly large curvature at the side portion.

That is, the backing member 4 is attached to one of the first backing member 32 and the second backing member 34.
The wiper blade 10 having 0 as the backing member 42 and the other as the backing member 42 has a large curvature as a whole. In the wiper blade 10 connected to the wiper arm 18, the backing members 40 and 42 compensate the pressing force at both ends where the pressing force is likely to be small, so that the blade rubber 12 follows the glass surface 20 over the entire length in the longitudinal direction. Can be done.

In the above example, the backing member 3
Although a description of the combination of the backing members 8 and the backing members 40 and 42 has been omitted, it goes without saying that such a combination of the backing members may be employed according to the curvature of the glass surface 20.

As described above, in the wiper blade 10, since the backing 14 is composed of a plurality of backing members (the first backing member 32 and the second backing member 34), the backing 14 corresponds to the combination of the plurality of backing members. A plurality of pressure distributions of the blade rubber 12 can be obtained.

Thus, for example, in addition to the four types of pressing force distributions obtained by combining the same backing members by the combination of the four types of backing members 36, 38, 40, and 42 shown in the above-described embodiment, different backing members are used. It is possible to obtain seven types of pressing force distributions by combining members, and it is possible to respond to a large number of pressing force distributions according to a large number of vehicle types and specifications with a small number of types of backing members 36 and the like. (Types of backing members having different elastic properties) can be reduced, the labor for parts management is reduced, and the cost is reduced.

As described above, in the wiper blade 10 according to the present embodiment, a small number of types of the backing members 36, 3
Many glass surfaces 2 with different curvatures by setting 8, 40, 42
A pressure distribution of the blade rubber corresponding to 0 can be obtained.

Since the backing 14 is composed of two backing members, the first backing member 32 and the second backing member 34, the blade rubber 12 has the plurality of pressing force distributions merely by providing the holding grooves 28 and 30. The backing member 36 for obtaining can be held,
The structure is simple.

Further, in the wiper blade 10 having the backing member 14 in which the first backing member 32 and the second backing member 34 have selected backing members having different curvatures, the first backing member 32 and the second backing member 34 have different curvatures. The member 34 complements the pressing force distribution according to the curvature of the glass surface 20 of the blade rubber 12 so that the pressing force distribution of the blade rubber 12 corresponding to the glass surface 20 can be obtained. A pressing force distribution corresponding to the glass surface 20 having an appropriate curvature can be obtained.

In particular, in the configuration in which the first backing member 32 and the second backing member 34 are formed symmetrically with respect to the central portion in the longitudinal direction and the backing members 36 and 38 having different curvatures at both ends are selected. For example, the pressing force distribution at both ends of the blade rubber 12 that cannot follow the glass surface 20 with the backing member 36 is supplemented by the backing members 38, so that the pressing force distribution of the blade rubber 12 corresponding to the glass surfaces 20 having different curvatures. Can be obtained.

In particular, a backing member 36 formed symmetrically with respect to the center in the longitudinal direction is selected as the first backing member 32, and a backing formed asymmetrically with respect to the center in the longitudinal direction as the second backing member 34. In the configuration in which the member 40 or the backing member 42 is selected, one end of the second backing member 34 has a larger curvature than the other end, so that the second backing member 3
The pressing force on the glass surface 20 at the end of the blade rubber 12 corresponding to one end of the fourth rubber 4 can be increased.

Thus, the wiper blade 10 connected (supported) to the wiper arm 18 at the central portion in the longitudinal direction.
Thus, the pressing force at the end of the blade rubber 12 where the pressing force tends to be small can be set appropriately. In particular, in a configuration in which the curvature on the distal side is larger than the curvature on the proximal side (Ry3 <Ry2) as the second backing member 34, the distal side wiping the upper and side portions of the windshield glass. , The pressing force of the blade rubber 12 can be increased, and a good pressing force distribution can be obtained even on the glass surface 20 where the curvature of the upper portion and both side portions is large.

Further, in particular, one of the first backing member 32 and the second backing member 34
In the configuration where 0 is selected and the backing member 42 is selected on the other side, the first backing member 32 and the second backing member 34 that are formed asymmetrically with respect to the center in the longitudinal direction are arranged opposite to each other. The pressing force of the glass surface 20 at both ends of the blade rubber 12 can be increased.

Thus, the wiper blade 10 connected (supported) to the wiper arm 18 at the center in the longitudinal direction.
Thus, the pressing force at both ends of the blade rubber 12 where the pressing force tends to be small can be set appropriately.

In the above embodiment, the backing member selected as the first backing member 32 or the second backing member 34 is the backing member 36, 38, 4.
Although examples of four types 0 and 42 have been shown, the present invention is not limited to this. For example, the first backing member 32 or the second backing member 34 may have a curvature of the glass surface 20 wiped by the wiper blade 10. Accordingly, one or more types of backing members may be appropriately selected. Therefore, for example, if ten types of backing members are prepared,
In addition to 10 types of combinations with the same backing member,
Forty-five types of combinations with different backing members can be obtained, and it is possible to adapt to a total of 55 types of glass surfaces 20.

In the above-described embodiment, the backing 14 has a preferable configuration including the first backing member 32 and the second backing member 34, but the present invention is not limited to this. For example, the backing 14 may be composed of three or more backing members. Further, some or all of the backing members constituting the backing 14 may be formed in a straight line in a natural state. Further, the at least one backing member that is curved in the longitudinal direction is not limited to a configuration having different curvatures in the longitudinal direction, may have a constant curvature in the longitudinal direction, and may have a part in the longitudinal direction that is linear. (It is needless to say that the curvature of each part in the longitudinal direction of the backing member is not limited to the magnitude relation as in the backing members 36, 38, 40, and 42). Furthermore, the backing member that constitutes the backing 14 is not limited to a plate-shaped member, and may be, for example, a rod-shaped or spiral-shaped.

Further, in the above embodiment, when the first backing member 32 and the second backing member 34 give different pressing force distributions to the blade rubber 12,
Although the preferred configuration has different curved states (elastic properties) in their natural state, the present invention is not limited to this. For example, the first backing member 32 and the second backing member 3
4 and the material and thickness are different from each other.
It is also possible to apply different pressing force distributions to the blade rubber 12 which is itself an elastic body (having different elastic characteristics).

Further, in the above-described embodiment, the wiper blade 10 is provided with the holding connecting portion 1 at the center in the longitudinal direction.
Although it is configured to be rotatably connected (supported) to the distal end portion of the wiper arm 18 via 6, the present invention is not limited by the configuration and connection position of the connection holding unit. Therefore, for example, the wiper blade 10 is
The wiper arm 18 may be rotatably connected (supported) to a distal end portion of the wiper arm 18 via a holding connection portion having a holder portion provided with an arm connection portion 46 above the arm. Further, for example, the arm connecting portion 46 may be provided integrally with the backing member.

In the above embodiment, the first backing member 32 and the second backing member 34 are preferably inserted and held in the holding grooves 28 and 30 of the blade rubber 12, but the present invention is not limited to this. Not, for example,
The backing member 32 and the second backing member 34 may be configured to be attached to the upper surface of the holding portion 24 of the blade rubber 12 in a state of being adjacent to each other or being overlapped with each other.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an overall configuration of a wiper blade according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a side view showing the overall configuration of the wiper blade according to the embodiment of the present invention.

FIG. 4 is a view showing a backing member constituting the wiper blade according to the embodiment of the present invention, wherein FIG. 4 (A) is a side view showing the backing member having a small curvature and being symmetric with respect to a central portion in the longitudinal direction; (B) is a side view showing a backing member having a large curvature symmetrical with respect to the central portion in the longitudinal direction, (C) is a side view showing a backing member having a large curvature on the proximal end side being asymmetrical with respect to the central portion in the longitudinal direction, D) is a side view showing the backing member which is asymmetrical with respect to the central portion in the longitudinal direction and has a large curvature at the distal end side.

FIG. 5 is a sectional view taken along line 5-5 in FIG. 1;

6A and 6B are diagrams showing a pressing force distribution of the wiper blade according to the embodiment of the present invention, wherein FIG. 6A is a diagram showing a preferable pressing force distribution on a glass surface, and FIG. FIG. 7C is a diagram illustrating a pressing force distribution on a plane due to a combination of backing members symmetrical with respect to FIG. 5C is a diagram illustrating a pressing force distribution on a plane due to a combination including a backing member that is asymmetrical with respect to the center in the longitudinal direction. .

[Explanation of symbols]

 Reference Signs List 10 wiper blade 12 blade rubber 14 backing 18 wiper arm 20 glass surface 32 first backing member 34 second backing member

Claims (6)

[Claims] An elongated blade rubber rotatably supported by a tip of a wiper arm and capable of wiping a glass surface of a vehicle; and a backing held by the blade rubber along a longitudinal direction of the blade rubber. In the wiper blade for wiping the glass surface by distributing the pressing force from the wiper arm acting on the support position by the wiper arm in the longitudinal direction of the blade rubber by the backing, the backing is naturally curved in the longitudinal direction. A wiper blade comprising a combination of a plurality of backing members including a formed backing member, and being elastically deformed in the bending direction corresponding to the glass surface by the pressing force. 2. The backing according to claim 1, wherein the backing is formed by a first backing member and a second backing member, each of which is formed to be curved in the longitudinal direction and has different curvatures in a natural state. Wiper blade. 3. The device according to claim 2, wherein the first backing member and the second backing member are respectively formed symmetrically with respect to a central portion in a longitudinal direction, and have different curvatures at least at both ends. Wiper blade. 4. The first backing member is formed symmetrically with respect to a longitudinal center portion, and the second backing member has one end portion larger than the other end portion with respect to the longitudinal center portion. The wiper blade according to claim 2, wherein the wiper blade is formed with a curvature. 5. The wiper blade according to claim 4, wherein the second backing member has the one end set at a tip end of the blade rubber. 6. The first backing member is formed such that an end on the tip end side of the blade rubber has a larger curvature with respect to a central portion in a longitudinal direction than the other end, and the second backing member. 3. The wiper blade according to claim 2, wherein the end of the blade rubber on the tip end side with respect to the center in the longitudinal direction has a smaller curvature than the other end. 4.