JPS63145155A - Packing member of wiper blade - Google Patents

Abstract

PURPOSE:To obtain the uniform distribution of the pressing force of a blade rubber with the simple constitution by connecting two parallel body members by a plurality of bridge parts and installing a pivot connecting part for permitting the shift in the longitudinal direction. CONSTITUTION:A backing member 3 consists of two body members 4 and 5 extending in parallel in the longitudinal direction and a plurality of bridge parts 6 connected each other. The distance 7 in the longitudinal direction of the both body members 4 and 5 is proper for accommodating the neck part of a blade rubber 1, and each bridge part 6 extends in the transverse direction. At least one among the pivot connecting parts 8 and 9 permits the relative shift in the longitudinal direction between the connection part 2A of a yoke 2. Therefore, the bending rigidity of the packing member 3 can be determined to a proper value, and the pressing force supplied from the yoke 2 is dispersed uniformly, and the cleaning performance for the rubber 1 can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a wiper blade used for wiping vehicle window glass, and particularly to a backing member thereof.

<Prior Art> In order to obtain good wiping performance of a wiper, it is important that the blade rubber contacts the glass surface with an even pressure distribution in the longitudinal direction. Generally, a metal elastic band plate is arranged on the upper surface of the blade rubber so that the pressing force transmitted from the yoke is distributed in the longitudinal direction and transmitted to the wiping end of the blade rubber. In order to further achieve even pressure distribution, a plurality of yokes are provided which are pivotally connected to each other,
It is also known that the pressing force is transmitted to the blade rubber at multiple points.

<Problems to be Solved by the Invention> The prior art described above requires a number of yokes that are pivotally connected to each other in order to obtain an even pressure distribution. This not only increases the number of yokes, but also complicates the structure of the yokes, resulting in a very high cost. The present invention aims to provide a device that solves this problem.

Means for Solving the Problems> According to the present invention, two main body members spaced from each other and extending parallel to each other in the longitudinal direction, and respective side main body members spaced apart from each other in the longitudinal direction are connected to each other. a plurality of bridge portions, the longitudinal spacing of the side body members being suitable to accommodate the neck of the blade rubber, each bridge portion being generally above the body member and extending laterally to the head of the blade rubber; At least two longitudinally spaced pivot connections are provided for connection to the yoke defining a corresponding space between the body member and at least one of the pivot connections. yoke to allow relative longitudinal movement between the yoke and the pivot connection.

A wiper blade backing member is provided.

It may have a predetermined bending stiffness against bending in the longitudinal and vertical center plane. Preferably there are two pivot connections and thus the yoke is a single member.

It may be used in combination with a metal elastic band, or the metal elastic band may be integrally molded with the main body member, for example, by embedding.

It is desirable to provide a notch in the main body member below the bridge portion to facilitate molding.

A means for inhibiting movement of the blade rubber in the longitudinal direction may be provided at at least one end of the main body member in the longitudinal direction, and the blade rubber may be inserted using a notch portion adjacent to at least one end in the longitudinal direction.

Effects> Since the backing member according to the present invention can have a predetermined bending rigidity, the pressing force distribution can be made appropriate by connecting it to the yoke at two points. Furthermore, the structure of the yoke is simplified, reducing costs.

Embodiment> In the embodiment of the present invention shown in FIGS. 1 to 3, 1
2 is a blade rubber, 2 is a yoke connected to a wiper arm (not shown), and 3 is a backing member according to the present invention. The blade rubber 1 has a wiping end IA, a neck IB, and a head IC, and the yoke 2 is connected to the backing member 3 by pivot connections 2A and 2B. The backing member 3 is.

two body members 4.5 extending longitudinally parallel to each other at a distance 7; a plurality of longitudinally spaced bridge portions 6.6 each connecting the side body members to each other;
. . ., the longitudinal spacing 7 of the side body members is suitable for accommodating the blade rubber 1'' neck I B , each bridge portion 6 being approximately above the body member 4°5 and extending laterally. At least two longitudinally spaced pivot connections 8, 9 extending and defining a space corresponding to the head IC of the blade rubber 1 between the main body members 4, 5;
are provided for connection to the yoke, and at least one of the pivot connections, 8, is adapted to permit relative longitudinal movement between it and the corresponding yoke pivot connection 2A. Although the connecting portion 8 is shown as a long hole in the figure, the connecting portion 2A may be formed as a long hole. Although 10 is a connecting pin, it is not necessary to use the connecting pin as the pivot connecting portion.

The main body member 4.5 is provided with a notch 11 below the bridge portion 6, as shown in FIG.
For example, it is easy to mold from synthetic resin. Note that there is a gap of 7 at both ends of the backing member 3.
is set to zero, or the longitudinal movement of the blade rubber is restrained by appropriate means, and the insertion is made at the notch 11 near one end.
It is also possible to do it from

For example, by forming the backing member 3 into a cross-sectional shape as shown in the figure, the bending rigidity, that is, the rigidity against bending in the paper plane of FIG. This can be applied to the wiping end IA of the blade rubber 1.

FIG. 4 shows a modification in which a metal elastic strip 12, 13 is inserted between the backing member 3' and the blade rubber 1'. Note that the metal elastic band plate may be integrally molded with the synthetic resin main body member.

FIGS. 5 and 6 show changes in pressure distribution at the wiping end IA of the blade rubber 1 when the pressing force is changed.

FIG. 5 shows the present invention in which a pressing force is applied at two points spaced apart in the longitudinal direction, and FIG. 6 shows that the pressing force is applied at a central position in the longitudinal direction. The peaks at medium and low pressures each time apparently indicate upper support points. According to the present invention, the pressure fluctuation in the longitudinal direction is small, the deflection of the end portion is small when the pressing force is changed, and the blade rubber does not stand up too much or fall down too much, so wiping performance is good and the cleaning performance is low. Since it can cover pressures ranging from pressure to high pressure, the number of types of blades can be reduced.

<Effects of the Invention> According to the present invention, pressure fluctuations in the longitudinal direction are small, vibrations at the end are small when the pressing force is changed, and the blade rubber does not stand up too much or fall down too much, making cleaning easier. It has good properties and can handle pressures from low to high, so the number of types of blades can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing an embodiment of the present invention, FIG. 2 is a perspective view showing a part of the blade rubber and the backing member,
Fig. 3 is a partial perspective view showing the connecting portion between the yoke and the backing member, Fig. 4 is a cross-sectional view showing a modified example, and Figs. 5 and 6 show cleaning of the blade rubber when changing the thrust force. 5 is a graph showing the pressure distribution at the wiping edge, FIG. 5 is based on the present invention, and FIG. 6 is based on the prior art shown for comparison. 1 Ni blade rubber 2: Yoke 3: Backing member 4.5: Main body member 6: Bridge part 7:
Spacing 2A, 2B, 8, 9: Pivot connection part I
A: Cleaning end IB: Cervical IC: Head

Claims (1)

[Scope of Claims] 1. It has two main body members spaced from each other and extending in parallel to each other in the longitudinal direction, and a plurality of bridge parts spaced apart from each other in the longitudinal direction and connecting the two main body members to each other, The longitudinal spacing of the body members is suitable to accommodate the neck of the blade rubber, and each bridge portion is generally above the body member and extends laterally to define a space corresponding to the head of the blade rubber between the body members. At least two pivot connections limited and longitudinally spaced in between are provided for connection to the yoke, at least one of the pivot connections being connected to a corresponding yoke pivot connection. A wiper blade backing member adapted to permit relative longitudinal movement therebetween. 2. Claim 1 has a predetermined bending stiffness against bending in the longitudinal direction and in the vertical center plane.
A backing member for a wiper blade as described in Section 1. 3 Claim 1, in which there are two pivot connection parts
A backing member for a wiper blade as described in Section 1. 4. The wiper blade backing member according to claim 1, which is used in combination with a metal elastic band plate. 5. The metal elastic band plate is integrally formed with the main body member.
A backing member for a wiper blade according to claim 1. 6. The wiper blade backing member according to claim 1, wherein a notch is provided in the main body member below the bridge portion to facilitate molding. 7. Means for inhibiting the movement of the blade rubber in the longitudinal direction is provided at at least one end of the main body member in the longitudinal direction, and a notch proximate to at least one end in the longitudinal direction is used for insertion of the blade rubber. A backing member for a wiper blade according to claim 6.