JPS61155042A - Wiper blade - Google Patents

Abstract

PURPOSE:To improve ability of a wiper blade for following a glass surface having large curvature, according to a method wherein a plurality of nodes connected in series to each other in the longitudinal direction of the wiper blade through a rotary pair are provided, and each node is capable of generating angular moment in the direction of a packing for wiping. CONSTITUTION:A main lever 26 is rotatably supported on the clip 22 of a wiper arm 20 by means of a pin 24, and some number of nodes 28, 30, 32 and 34 (four nodes are shown in the drawing) are rotatably connected in series to each other on both sides of the longitudinal direction of the main lever 26 by means of pins 36, 38, 40 and 42. A holder 44 is fixed on each node 28 to 34, and a packing 46 is held by means of these holders 44 and is slidable in the longitudinal direction. Each of semicircular pulleys 56, 62, 68 and 74 is rotatably mounted on each of the pins 36 to 42, and tension springs 58, 64, 70 and 76 are inserted between the pins 24 and 36 to 40 adjacent to the insides of the lower ends of the pulleys 56 to 74. Wires 60, 66, 72 and 78 are tensed and mounted between the pins 38 to 42 and 42' adjacent to the outsides of the lower ends of the pulleys 56 to 74.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a wiper blade for a wiper device for wiping vehicle window glass, and particularly to a wiper blade for curved glass.

(Conventional technology) The structure of a conventional wiper blade is shown in FIG.

In FIG. 8, the blade rubber 10 is attached to the backing 12.
The backing 12 is supported by two yokes 14. The two yokes 14 are further attached to a lever 16 which is attached via a clip 18 to the wiper arm.

The wiping ability of a wiper blade depends on the contact pressure between the blade rubber and the window glass due to the force of a spring in the protection box of the wiper device, and the shape and material of the blade rubber. Furthermore, in the case of a wiper blade for curved glass, the ability of the wiper blade to follow the bending of the curved glass also greatly affects the wiping ability of the wiper blade.

(Problems to be Solved by the Invention) In the above-mentioned conventional wiper blade, since a structure consisting of a combination of the lever 16 and the yoke 14 is adopted, the ability of the backing 12 and the blade rubber 10 to follow the curved glass is limited. , the yoke 14 is the backing 12
The pressing at the point where it is supported depends on the force. However, the number of locations where the yoke 14 supports the backing 12 is limited, for example, in the case of two yokes as shown in FIG. 8, there are four locations. The wiping ability for uneven window glass was insufficient. When the ability of the wiper blade to follow the bending of the window glass decreases, the load distribution in the longitudinal direction of the wiper blade becomes uneven, making it impossible to wipe the curved glass well.

Based on the structure of the conventional wiper blade described above, if the number of locations where the yoke 14 supports the backing is increased, the ability to wipe a window glass with a large curvature may be improved. However, in order to increase the number of yokes 14,
Considering the function of the yokes 14, it is necessary to stack the yokes 14 in several stages. In this case, the height of the wiper blade becomes very high, which significantly obstructs the driver's view when the wiper is operated. Further, stacking the yokes 14 causes problems such as weakening of the overall stiffness of the wiper blade.

This invention provides a wiper that allows the blade rubber to follow a glass surface with a large curvature, has a uniform load distribution in the longitudinal direction of the blade rubber, and has a low wiper blade height that does not obstruct the driver's view when the wiper is activated. The purpose is to provide blades.

(Means for Solving the Problems) In order to achieve the above object, the wiper blade of the present invention has the following components.

(a) Main lever installed at the longitudinal center of the wiper blade.

(b) A plurality of joints connected in series to each other via circumferential pairs on both sides of the main lever in the longitudinal direction.

(c) Backing attached to the main lever and joint.

(d) A blade rubber that is slidably attached to a groove formed in the backing.

(e) A device that applies a rotational moment to a joint connected to the main lever that causes the joint to rotate in the backing direction relative to the main lever.

(f) A device that applies a rotational moment to adjacent nodes that rotates one of the adjacent nodes in the backing direction relative to the other node.

(Function) The wiper blade of the present invention having the above-described configuration functions as follows. When the wiper blade contacts a glass surface with a large curvature, each node connected in series in the longitudinal direction is subjected to a rotational moment in the backing direction relative to the adjacent node.

As a result, each node presses the backing and the blade rubber supported by the backing so as to follow the curved surface of the glass surface.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2 are a vertical sectional view and a horizontal sectional view of an embodiment of the present invention. Figures 3, 4 and 5 are
2 is a plan view, a front view, and a side view of the embodiment shown in FIG. 1. FIG. 3 and 4, the clip 22 of the wiper arm 20 is attached to the main lever 26 by a pin 24.
rotatably supported. On one longitudinal side of the main lever 26, a first section 28, a second section 30, a third section 32, and a fourth section 34 are arranged in series.
are rotatably connected to each other by. Main lever 2
Similarly, four nodes are connected in series on the other longitudinal side of the main lever 26, but the configuration is the same as that on one longitudinal side of the main lever 26, so in the following description, , a description of the configuration of the other longitudinal side of the main lever 26 will be omitted.

Each section 28.30.32.34 has a backing holder 44.
are fixed, and the backing 46 is held by these backing holders 44 so as to be slidable in the longitudinal direction. The blade rubber 48 is slidably attached to a longitudinal notch groove formed in the backing 46.

1 and 2, center yoke 50 is rotatably attached to main lever 26 by pin 24. In FIGS. The center yoke 50 holds the backing 46 slidably in the longitudinal direction of the blade. The side yoke 52 is also rotatably attached to the main lever 26 by a pin 54. The side yoke 52 is the center yoke 5
0, retain the backing 46.

The first pulley 56 is rotatably attached to the bin 36.

A first tension spring 5 is provided between the lower end of the first sliding wheel 56 and the bin 24.
Combine 8. One end of the first wire 60 is connected to the first pulley 56
The other end of the first wire 60 is fixed to the bottle 38. The 28th I wheel 62 is rotatably attached to the bin 38. A second tension spring 64 is coupled between the lower end of the 2111th wheel 62 and the bin 36. One end of the second wire 66 is hooked onto the end of the large semicircular part of the second pulley 62 and wound along the large semicircular part, and the other end of the second wire 66 is fixed to the bin 40. The configurations of the third pulley 68, third tension spring 70, third wire 72, fourth pulley 74, fourth tension spring 76, and fourth wire 78 are also the same as those of the first
The configuration is similar to the configuration regarding pulleys and the like.

FIG. 6 is an enlarged partial vertical sectional view of the embodiment shown in FIG. 1, and the operation of this embodiment will be explained with reference to this figure. Bin 24 (not shown in FIG. 6) and the first
A first tension spring 58 coupled to the lower end of the pulley 56 applies a force to the first pulley 56 in the direction of the open arrow. Therefore, a counterclockwise rotating moment l is applied to the first pulley 56 around the bin 36 . And the first
The first wire 60 wound around the semicircular portion of the pulley 56 receives a force in the direction in which it is wound around the eleventh wheel 56 .

As a result, the bin 38 receives a force from the first wire 60 in a downward right direction, and the first section 28 receives a counterclockwise rotational moment about the bin 36 . Similarly, second tension spring 64 imparts a counterclockwise rotational moment to second pulley 62 and second segment 30 receives a counterclockwise rotational moment about bin 38 via second wire 66 . Section 3 32 and 4
Node 34 is similarly subjected to a counterclockwise rotational moment about bin 40.42. Thus, considering the left half of the wiper blade in FIG. 1, each of the first to fourth nodes receives a counterclockwise rotational moment about the bin located at the right end of each node. Therefore, the entire series-connected surfaces can be bent so as to be able to follow a glass surface with a large curvature.

Here, even if each node rotates around the bin, the adjacent two
The triangle formed by the bins (for example, the bins 36 and 38) and the contact point between the wire and the pulley (for example, the contact point between the first pulley 56 and the first wire 60) is always constant.

The tensile force exerted by each tension spring depends on the spring constant and elongation of the tension spring, and by appropriately selecting these spring constants and elongations, the tensile force of each tension spring can be made the same. Since the structure of the combination of pulley, tension spring, and wire from the first section 28 to the fourth section 34 is the same, if the tensile force of each tension spring is the same, the rotational moment received by each node will have the same value. . As a result, the load distribution in the longitudinal direction of the wire blade becomes uniform.

In addition, if the tension spring is configured to have a relatively small spring constant and a large extension to obtain a predetermined tensile force, even if the relative angle between each part changes, the rotational moment received by the joint can be reduced. It can be kept almost constant. In other words, the elongation of the tension spring changes when the relative angle between the parts changes, but if the initial elongation of the tension spring is set large, the amount of change in elongation relative to the total elongation of the tension spring will be small, and the tension force will increase. The rate of change in can also be small.

Therefore, even if the relative angle between the parts changes, the value of the rotational moment received by the joint is not significantly affected. As a result, while the wiper blade follows the curved glass, the force with which the wiper lever presses against the glass surface remains approximately constant.

The operations described so far are similar on the other longitudinal side of the wiper blade (the right half in FIG. 1). However, in the right half of FIG. 1, each node will experience a clockwise rotational moment about the bin located at the left end of the node.

Next, another embodiment of the present invention will be described with reference to FIG. FIG. 7 shows an enlarged partial vertical cross-section of this embodiment. The first section 28 is rotatably attached to the main lever 26 by a pin 36. The first torsion coil spring 80 is rotatably mounted around the bin 36, with one end 82 of the first torsion coil spring in contact with the inside of the floor plate of the main lever 26, while the other end 84 of the first torsion coil spring
is brought into contact with the inside of the ceiling board of the first section 28. Similarly, second section 30 is rotatably attached to first section 28 by pin 38. The second torsion coil spring 86 is rotatably mounted around the bin 38 and has one end in contact with the inside of the floor plate of the first section 28 and the other end in contact with the inside of the ceiling plate of the second section 30. The third section 32 and the fourth section 34 are configured in the same manner.

Next, regarding the operation of the embodiment shown in FIG.
will be explained using an example. The second torsion coil spring 86 is
A restoring force acts in a direction that opens the one end 88 and the other end 90 from each other. Therefore, the other end 9 of the second torsion coil spring 86
0 pushes up the right end of the ceiling board of the second section 30 and
0 receives a counterclockwise rotational moment about the bin 38.

Similarly for the other nodes, the first node 28 receives a counterclockwise rotational moment around the bin 36, the third node 32 around the bin 40, and the fourth node 34 around the bin 42, respectively. As a result, the entire series-connected nodal structure is
It can also follow glass surfaces with large curvature. In addition, by setting the restoring force and spring constant of the torsion coil spring to appropriate values, similar to the tension spring shown in Fig. 1, the rotational moment received by each node can be made the same, and roughly speaking, Even if the relative angle between each part changes, the rotational moment that the node receives can be kept almost constant.

(Effects of the Invention) The wiper blade of the present invention includes a plurality of joints connected in series to each other in the longitudinal direction of the wiper blade through a circumferential couple, and each joint applies a rotational moment in the backing direction. This allows the wiper blade to better follow a glass surface with a large curvature. In addition, by appropriately setting the characteristics of the device that applies rotational moment provided at each joint, the load distribution on the wiper blade can be made uniform along the longitudinal direction of the wiper blade, and the Regardless of the curvature of the surface,
The contact pressure of the wiper blade can be made almost constant.

Furthermore, since the wiper blade of this invention adopts a joint structure connected in series, the height of the wiper blade can be reduced even though it can follow a glass surface with a large curvature. The driver's view is not obstructed by the wiper blade.

[Brief explanation of the drawing]

1 is a vertical cross-sectional view of an embodiment of the present invention taken along the line E in FIG. 3; FIG. 2 is a horizontal sectional view taken along the line ■-■ in FIG. 4 of the embodiment shown in FIG. 3 is a plan view of the embodiment shown in FIG. 1, FIG. 4 is a front view of the embodiment shown in FIG. 1, and FIG. 5 is a side view of the embodiment shown in FIG. 1. , FIG. 6 is an enlarged partial vertical sectional view of the embodiment shown in FIG. 1, FIG. 7 is an enlarged partial vertical sectional view of another embodiment of the invention, and FIG. 8 is a conventional wiper blade. FIG. 26...Main lever, 28.30.32.34...Section, 36.38.40.42...Bin, 46...Backing, 48...Blade rubber, 58.64.70. 76... tension spring, 80.86.
...Torsion coil spring.

Claims (1)

[Claims] A wiper blade having the following components: (a) Main lever installed in the longitudinal center of the wiper blade. (b) A plurality of joints connected in series to each other via circumferential pairs on both sides of the main lever in the longitudinal direction. (c) Backing attached to the main lever and joint. (d) A blade rubber that is slidably attached to a groove formed in the backing. (e) A device that applies a rotational moment to the joint connected to the main lever so as to rotate the joint in the backing direction with respect to the main lever. (f) A device that applies a rotational moment to adjacent nodes that rotates one of the adjacent nodes in the backing direction relative to the other node.