JP2943500B2 - Vehicle wiper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper such as a window glass for automobiles, trains and other vehicles.

[0002]

2. Description of the Related Art A supported portion of a wiper blade having a wiping portion and a supported portion connected to the wiping portion via a skewer portion is formed by a round bar having a circular cross section, and a yoke for supporting the wiper blade. Is formed in a cylindrical shape for receiving the round bar, and the wiper blade can swing relative to the yoke in a direction substantially perpendicular to the length direction of the wiper blade. No. 52-53333).

[0003] According to the wiper, when the wiper changes direction and reverses, the wiper blade swings and reverses. Posture can be maintained satisfactorily.

[0004]

On the other hand, the load applied to the wiper blade for pressing the wiping portion against the glass surface generates a frictional force when the supported portion swings, and this frictional force is generated. When the coefficient of friction of the wiper blade with respect to the glass surface decreases, the wiper blade swings, because it acts as a drag against the swing of the wiper blade and no restoring force is applied to the wiper blade toward the neutral position of the swing. There is a risk of inducing movement failure.

An object of the present invention is to provide a wiper for a vehicle in which a wiper blade swings with respect to a yoke, and which can suppress occurrence of swinging failure of the wiper blade.

[0006]

SUMMARY OF THE INVENTION A wiper for a vehicle according to the present invention has a glass wiping portion at one end and a supported portion at the other end of a cross section orthogonal to the longitudinal direction, and has an arcuate rotary motion. A wiper blade having a substantially circular outer peripheral surface and holding the supported portion of the wiper blade, the holder having a shorter length than the length of the wiper blade, and a length of the wiper blade And a yoke for swinging the wiping portion of the wiper blade in the rotation direction of the wiper blade, supporting the holder so as to be swingable in a direction substantially orthogonal to the Biasing spring means. The spring means engages the holder over substantially the same length as the holder.

[0007]

When the wiper changes its direction of movement and reverses, the holder holding the wiper blade swings with respect to the yoke, and the wiping portion of the wiper blade reverses.

When the wiper is turned over, the wiping portion of the wiper blade swings and turns over, so that the wiping portion can maintain a good posture with respect to the glass without exerting an excessive force on the wiping portion. Thereby, the life of the wiper blade can be extended, and high wiping performance can be obtained.

Since the wiper blade is biased toward the neutral position of the swing by the spring means, the frictional force when the wiping portion of the wiper blade swings and reverses is reduced. Therefore, even when the coefficient of friction of the wiper blade against the glass surface decreases, the wiping portion of the wiper blade can be swung.

Usually, since the wiper blade is formed of rubber, the yoke and the wiper blade do not easily swing. However, according to the present invention, the holder interposed between the yoke and the wiper blade is formed of metal or resin. Because it is possible, it is easy to secure a smooth swing.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A wiper 10 for a vehicle includes a wiper blade 12, a holder 14, a yoke 16, and spring means 18, as shown in FIGS.

The wiper blade 12 has a glass wiping portion 20 at one end of a cross section orthogonal to the length direction and a supported portion 21 at the other end. It is made of rubber.

In the illustrated embodiment, the supported portion 21 of the wiper blade 12 is formed so that its outer peripheral surface has a circular shape, and two inserts 22 extending in the length direction are embedded in the supported portion 21. I have. The wiper blade 12 has an insert 22 whose rigidity in the longitudinal direction is increased. The wiper blade 12 has a holder 14 and a yoke 1 described later at a plurality of positions in the longitudinal direction.
6 is possible.

The holder 14 holds the supported portion 21 of the wiper blade 12 and has a substantially circular outer peripheral surface 24.
Having.

In the embodiment shown in the drawings, the holder 14 is formed of a short cylindrical member for holding the supported portion 21 only at a portion where the yoke 16 is to be described later and in the vicinity thereof. In this embodiment, two ends 25 and 26 are opposed to each other with an interval. The holder 14 can be formed of metal or plastic. The two ends 25 and 26 of the holder are fitted into the supported part 21,
Abuts against the connecting portion 19 between the wiping portion 20 and the supported portion 21,
The supported portion 21 is clamped by the elasticity of the holder 14.

Instead of embedding the insert 22 in the supported portion, the holder 14 may be formed as a long one extending over the entire length of the wiper blade 12, thereby providing the wiper blade 12 with rigidity.

The yoke 16 supports the holder 14 so as to swing in a direction substantially perpendicular to the length direction of the wiper blade 12.

In the illustrated embodiment, the yoke 16 has a holding portion 28 for supporting the holder 14 and a connecting portion 29, and the holding portion 28 is formed in a bifurcated shape having a circular inner peripheral surface.
The holding portion 28 is fitted in the holder 14. In one yoke 16, two holding portions 28 are provided at intervals in the longitudinal direction of the wiper blade 12, and these holding portions 28 are integrally connected by a connecting portion 29. Preferably, the wiper blade 12 is supported by the individual pieces.

As shown in FIG. 1, the holder 14 has two stopper portions 27, and the holding portion 28 of the yoke 16 is fitted between the two stopper portions 27. As a result, the yoke 1 of the wiper blade 12 is generated when the wiper blade 12 follows the change in the curvature of the glass surface during wiping.
6 is absorbed by the supported portion 21 of the wiper blade 12 sliding with respect to the holder 14.

The spring means 18 includes the wiper blade 1
The second wiping portion 20 is biased toward the swinging neutral position.

In the embodiment shown in FIG.
Reference numeral 8 denotes a wire spring made of a spring steel wire rod, which is curved in a zigzag shape. While the two spring means 18 thus formed are arranged with the holding portion 28 of the yoke 16 interposed therebetween, as shown in FIG. 3 and FIG.
A hook 32 is provided at a part of each of the two ends 25 and 26 of FIG. 4, and the two hooks 33 are projected from the yoke holding portion 28 in the length direction of the wiper blade 12, and the spring means 18 is hooked. Hook on 32, 33 and fix.

As shown in FIGS. 3 and 4, the hooks 32 and 33 can hook one spring means 18 on the hook 32 and the hook 33.
In addition, the hooks 32 and 33 that engage with one spring means 18 and the hooks 32 and 33 that engage with the other spring means 18 are located opposite to each other.
Determine. As a result, in the state shown in FIG. 3, the holder 14 tends to rotate clockwise by receiving the tension F1 from the spring means 18, and in the state shown in FIG. 4, the holder 14 rotates counterclockwise by receiving the tension F2 from the spring means 18. And Therefore, if F1 = F2 is set, the wiper blade 12 is held at the neutral position because the rotational force is balanced when the holder 14 is at the neutral position.

When the wiper blade 12 performs the wiping operation in the direction A, as shown in FIGS. 5 to 7, the wiper blade 12 has its coupling portion 19 connected to the end portion 40 of the holding portion 28 of the yoke 16 and the holder 14 The wiping unit 20 wipes the glass surface 42 while maintaining the posture in which it abuts on the end 26 of the glass. At this time, the tension of the spring means 18 in FIG. 6 decreases to F1 '(F1'<F1), and the tension of the spring means 18 in FIG. 7 increases to F2 '(F2'> F2).
). Therefore, a counterclockwise restoring force F = F2'-F1 '(> 0) acts on the wiper blade 12.

Further, the wiping unit 20 of the wiper blade 12
, A pressing force directed from the wiper arm (not shown) to the glass surface 42 via the yoke 16 is applied.
The wiping unit 20 receives a reaction force of F3 from the glass surface 42. Since the frictional force due to the reaction force F3 is opposite to the direction in which the tension (F1 '+ F2') acts on the spring means 18, the spring means 18 acts to reduce the frictional force of the swinging part.

When the wiping operation in the direction A is completed and the direction in which the wiper 10 moves is reversed, the holder 14 swings, and the wiper blade 12 is reversed from the position shown in FIG. 7 to a position symmetrical with respect to a vertical line. Thereafter, the wiping operation in the direction opposite to the direction A is performed.

Referring to FIGS. 8 to 13 which show an embodiment having another spring means, a spring means 58 is shown.
Is a bag made of rubber boots, and has a bellows portion 60 and a cover portion 61 covering the supported portion of the wiper blade.
And As shown in FIG. 13, the boot is formed such that the center position B of the cover 61 in the free state of the boot is lower than the center position C in the assembled state. Then, the bellows portion 60 is assembled by being bent by h, and a force for pushing the wiper blade downward can be generated, whereby the frictional force when the wiper blade swings can be reduced.

The wiper blade 52 includes a wiping portion 70 and a supported portion 71 having a circular outer peripheral surface.
Is fitted. The backing 72 extends over the entire length of the wiper blade 52 and the wiper blade 52
To the longitudinal direction.

The holder 54 is placed in a bag-like boot 58, and the holder 54 and the cover 61 of the boot 58 are
2 and the boot 58 is attached to the wiper blade 52. On the other hand, the opening of the boot 58 is inserted into the forked holding portion 67 of the yoke 66, and the holding portion 67 is fitted into the cover portion 61 of the boot. In order to enhance the adhesion between the boot 58 and the holding portion 67, it is preferable to provide a ring-shaped thick portion 62 at the opening of the boot 58. Does not enter the inside of the boot 58.

When the wiper blade 52 performs the wiping operation in the direction A as shown in FIG.
The stopper 69 is connected to the yoke 6 via the holder 54.
The wiping unit 70 wipes the glass surface 42 while being kept in a state where it abuts the holding unit 67 of FIG. At this time, the bellows 6 on the front side in the wiping direction of the boot 58 as a spring means
0 extends, and the bellows 60 on the rear side in the wiping direction contracts. As a result, a counterclockwise restoring force acts on the wiper blade 52.

[Brief description of the drawings]

FIG. 1 is a front view of one holding portion of a yoke in an embodiment of a wiper according to the present invention.

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

FIG. 3 is a sectional view taken along line 3-3 in FIG. 1;

FIG. 4 is a sectional view taken along line 4-4 in FIG. 1;

FIG. 5 is a sectional view similar to FIG. 2, showing the operation of the wiper according to the present invention.

FIG. 6 is a sectional view similar to FIG. 3, showing the operation of the wiper according to the present invention.

FIG. 7 is a sectional view similar to FIG. 4, showing the operation of the wiper according to the present invention.

FIG. 8 is a front view of another holding part of the yoke of another embodiment of the wiper according to the present invention.

FIG. 9 is a plan view of FIG.

FIG. 10 is a sectional view taken along the line 10-10 in FIG. 9;

FIG. 11 is a cross-sectional view taken along the line 11-11 of FIG.

FIG. 12 is a sectional view showing the operation of the wiper shown in FIG.

FIG. 13 is a cross-sectional view before assembling a boot as a spring means.

[Explanation of symbols]

 Reference Signs List 10 Wiper 12, 52 Wiper blade 14, 54 Holder 16, 66 Yoke 18, 58 Spring means 20, 70 Wiping part 21, 71 Supported part

Claims (1)

(57) [Claims] 1. A wiper blade that has a glass wiping portion at one end and a supported portion at the other end of a cross section orthogonal to the longitudinal direction, and has a substantially circular outer peripheral surface. A holder having a length shorter than the length of the wiper blade, for holding the supported portion of the wiper blade, and a holder capable of swinging in a direction substantially perpendicular to the length direction of the wiper blade. A yoke that supports the holder and swings the wiping portion of the wiper blade in the rotation direction of the wiper blade; and a spring means that biases the wiper blade toward a neutral position of the swing. A wiper for a vehicle, which is engaged with the holder over substantially the same length as the length of the holder.