JP2681647B2 - Wiping range switching device for vehicle wipers - Google Patents

Description

TECHNICAL FIELD The present invention relates to a wiper range switching device for a vehicle wiper that wipes a window of a vehicle such as an automobile.

[Problems to be Solved by Prior Art and Invention] In general, it is preferable that the wiper device of this type is configured to be housed in the lower side as much as possible so that the wiper blade does not interfere with the field of view when not operating. However, in such a case, if snow accumulates in the storage space during the winter, the snow interferes with the movement of the wiper blade to the storage position and an unnecessary load is exerted, which results in the wiper blade, the wiper arm, and the wiper. There is a risk of damaging members such as the link rod or wiper motor.

Therefore, it has been attempted to reduce the wiping range on the storage position side of the wiper arm to eliminate the influence of snow, but in the link mechanism for wiping and swinging the wiper arm, the wiping range on the storage position side was simply narrowed. In this case, the pay station range on the reverse position side also becomes narrow. However, the narrowing of the reversal position is not preferable because it substantially reduces the wiping area of the window surface.
It is necessary to enable position switching only on the storage position side.

And as such a thing, for example, the actual development Sho 60-51164
Although known in Japanese Patent Laid-Open Publication No. JP-A-2003-242242, all of these have a disadvantage that the structure is not allowed and the wiping range switching operation is complicated and quick specification switching cannot be performed.

[Means for Solving the Problem] In view of the above circumstances, the present invention was devised with the object of providing a wiping range switching device for a vehicle wiper capable of eliminating these drawbacks.
In order to respond to the reciprocal swing between the retracted position and the retracted position of the wiper arm, the first link to which the rotational drive of the crank arm associated with the motor drive is transmitted via the first link rod uses the first support shaft as a fulcrum. The second link is swingably supported on the first link via a second support shaft, and the tip support shaft is provided on the wiper arm side on the second link. The third link shaft when the second link rod, which is swingably interlocked via the third link shaft, is swingably supported by the third link shaft and the second link is swing-switched with respect to the first link. When the wiper arm is in the retracted position, the oscillating displacement of the second support shaft is directed in the rod length direction of the second link rod, and in the inverted position, the tip support shaft is the apex and the second link rod is divided into equal parts. Dynamic link mechanism A switching position holding means for switching the swing of the second link with respect to the link and holding the position in the switched state is provided so as to be interposed between the first link and the second link. It is what

Further, according to the present invention, the wiping arm can be switched and retained only on the storage side of the wiper arm with a simple structure and swiftly and reliably.

Example Next, an example of the present invention will be described with reference to the drawings.
In the drawings, reference numeral 1 denotes a wiper blade, which is attached to a wiper arm 2. A wiper shaft 3 integrally projecting at a base end portion of the wiper arm 2 is provided around a pivot holder 4 about its axis. One end portion of the second link rod 5 is rotatably pivotally supported, and one end portion of the second link rod 5 is connected to the tip end portion of the bottom lever 3a integrally extending from the wiper shaft 3 via a ball joint (corresponding to the tip support shaft of the present invention) 6. It is swingably connected.

On the other hand, 7 is a wiper motor,
The base end portion of the first link rod 9 is pivotally supported on the tip end portion of the crank arm 8 which is interlocked with the motor shaft of the above, and the present invention is applied to the connecting portion between the first link rod 9 and the second link rod 5. The wiping range switching device 10 is formed. Reference numeral 11 denotes a first link that constitutes the switching device 10, and the first link 11 is a holder 11 fixed to the vehicle body side.
Although it is pivotally supported by a through a first support shaft 11b, one end of the first link 11 is provided with a tip end portion of the first link rod 9 through a ball joint 12. A link arm A that is pivotally supported so as to swing and that connects the first support shaft 11b and the ball joint 12 with the drive of the wiper motor 7 has a storage position corresponding to a storage position and a reverse position of the wiper arm 2 described later. It swings back and forth within a swing angle α range from X ₁ to the inverted position Y ₁ .

Further, 13 is a second link which is arranged in a laminated shape with a space in the first link 11, and the base end portion of the second link 13 is a second link on the other side portion of the first link 11. It is pivotally supported via a support shaft 13a so as to be swingable, and a first link arm B is formed between the first support shaft 11b and the second support shaft 13a.

The first link arm B is the link arm A.
In accordance with the swing of the second link rod 5, the reciprocating swing is performed within the swing angle α from the storage position X ₂ to the reversing position Y _2. The end is
It is pivotally supported with the ball joint 14 as the third support shaft,
A second link arm C is formed between the third support shaft 14 and the second support shaft 13a. And the second link 13 is the second support shaft.
An angle γ to be described later with respect to the first link 11 with 13a as a fulcrum
In the case where the first and second link arms B and C are relatively swung in the range of
Is located at the retracted position X ₂ , when the swing displacement direction of the third support shaft 14 is in the rod length direction of the second link rod 5, and when the first link arm B is located at the reversal position Y _2. Means that the second support shaft 13a is substantially positioned on the extension line of the second link rod 5 and the swinging displacement direction of the third support shaft 14 is equally divided by the second link rod 5 with the ball joint 6 as a fulcrum. The link configuration is set so as to face the direction of oscillating.

Further, 15 is arranged in the stacking space between the first link 11 and the second link 13, and the middle portion of the first link 11 is a support shaft.
A bracket having a bottomed cylindrical shape that is pivotally supported via 15a, and has a bullet 16 in which the base end is supported by the bottom. The tip of this ammunition machine 16 is supported by a support body 17 that is rotatably supported by a second link 13 via a support pin 13b, and the second link 13 is a fulcrum about a second support shaft 13a. When the support pin 13b is swung relative to the first link 11 as described above,
Of the second support shaft 13a of the fulcrum and the support shaft 1 of the bracket 15
The swinging movement of the bullet 16 over the fulcrum is performed based on the oscillating movement with 5a as the fulcrum, and the bracket 15 is oscillatingly displaced by the angle β, whereby the second link 13 is moved to the second fulcrum shaft as shown in the drawing. 13a is used as a fulcrum to swing upward relative to the first link 11 in accordance with the summer specification state and the downward specification swing state in the winter specification state, and the state is changed by swinging by an angle γ, and the state is changed. The switching position holding means for holding the respective positions of the wiper arm 2 by switching the storage position of the wiper arm 2 between the summer specification and the winter specification is held by the first link 11. It is provided so as to be interposed between the second link 13.

In the embodiment of the present invention configured as described above, the wiper arm 2 is driven by the wiper motor 7 to swing back and forth between the retracted position and the retracted position. Is in the storage position X ₂ , when the switching means is set to the summer specification, that is, when the second link 13 is swung upward as described above, the second link arm C moves to the second position. Link rod 5
Is set to the summer specification position S ₁ on the pulling side.

When the switching means is switched to the winter specification in this state, the second link arm C swings by the angle γ and the third support shaft 14 is displaced in the direction of pushing the second link rod 5 and set to the winter specification position W ₁ . As a result, the pivot lever 4 swings, and the wiper arm 2 swings from the summer specification position S to the reversal position side by an angle δ corresponding to the movement amount of the third support shaft 14 in the retracted position. It moves to the position W, and this is the storage position in the winter specification state. Therefore, it is possible to cope with snowfall sufficiently.

On the other hand, on the reverse position side, that is, when the first link arm B is located at the reverse position Y ₂ , the second link arm C faces the second link rod 5. When the specifications of the second link 13 are changed, the second link arm C is swung following the specification change. However, the third support shaft 14 uses the link rod 5 as a substantially bisector. Moved from the summer specification position S ₂ to the winter specification position W ₂ where the second link rod 5 and the ball joint portion 6 intersect.
The pivot lever 4 does not swing only by swinging about the fulcrum, and as a result, the reverse position Y of the wiper arm 2
Does not substantially change even if the specifications are switched, and does not affect the wiping range on the side.

As described above, in the embodiment of the present invention, the wiping swing range of the wiper arm 2 does not change on the reversing position Y side, and it greatly descends on the storage position side at the summer specification position S.
And the winter specification position W located above it can be switched. In addition, the switching can be performed by swinging the second link 13 without the need for complicated operations as in the conventional case, and this switching is performed by gripping the wiper arm 2 and swinging the wiper arm 2, for example. In some cases, the wiper arm 2 that is about to descend to the summer specification position can be automatically switched to the winter specification state by receiving the load pushed back by the snowfall, and accordingly, the running condition can be improved. There is an advantage that an appropriate wiping range following the above can be arbitrarily determined.

Moreover, in this configuration, the switching position holding means is configured such that the swing displacement direction of the first and second link arms B and C is set to the link rod 5 direction when the wiper arm 2 is in the retracted position. This is achieved by constructing a link so that it is in a direction intersecting with the link rod 5 in the inverted position state. Therefore, the structure does not become particularly complicated, and it can be constructed with a simple one, and of stable quality. Can be provided in large quantities and at low cost.

Also, in this one, the ammunition 16 installed in the bracket 15 is adopted as a torsion spring that crosses the fulcrum, but this bracket 15 is interposed between the first link 11 and the second link 13. Since it is placed in a space, it can be designed compactly and can be used even in a space-limited space.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and the amount of switching of the wiping range on the retracted position side of the wiper arm can be arbitrarily determined as necessary, and the specification switching between summer and winter can be performed. In this case, the movement displacement direction of the third support shaft may be such that the link rod is moved in the rod length direction at the retracted position and the link rod is swung like a fan at the inverted position.

Further, the switching means is not limited to one that adopts a torsion spring and can switch between two stages,
For example, a steel ball may be elastically urged from the second link side toward the first link side, and the steel ball may be selectively fitted into a plurality of shifter holes provided in the first link. In this case, the switching is not limited to the two-step switching, and the three-step or more switching can be performed.

[Advantageous Effects] In short, since the present invention is configured as described above, when the second link is swing-switched with respect to the first link, the third support shaft swings following this. However, in the retracted position, the second link rod is moved in the rod length direction to move the position of the wiper arm, but in the inverted position, the direction in which the swing motion with the tip of the second link rod as the spindle is equally divided is directed. There is no substantial position movement of the wiper arm due to the fan-shaped swing. Therefore,
The wiper arm wiping operation remains unchanged on the reversing position side, and the wiping range can be positively changed and changed on the storage position side to maintain this state. Switching can be performed without giving unnecessary load to the blade side.

Moreover, this specification changeover structure can be achieved by a simple link structure of the first link and the second link without adopting a complicated mechanism as in the conventional case, and the changeover operation is performed by changing the first link to the first link. A simple structure, excellent operability, and stable quality can be provided in large quantity and at low cost because it is sufficient to switch the link to swing.

Moreover, the switching position holding means for switching the swing of the second link with respect to the first link and holding the position is provided in an arrangement configuration interposed between the first link and the second link, and as a result, the switching position is changed. Holding means first link,
Since the space for disposing the second link can be effectively utilized for disposition, a compact design can be achieved, and it is possible to sufficiently cope with those which are limited in space.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings show an embodiment of a vehicle wiper wiping range switching device according to the present invention, wherein FIG. 1 is a schematic perspective view of the wiper device, and FIG. 2 is a wiping range. A plan view of a main part of the switching device, FIG. 3 is a front view of the same as above, FIG. 4 is an operation explanatory view showing a specification switching state at a storage position, and FIG. 5 is an operation explanatory view showing a specification switching state at an inversion position. FIG. 6 is an explanatory view of link operation. In the figure, 1 is a wiper blade, 2 is a wiper arm, 5 is a link rod, 7 is a wiper motor, 10 is a wiping range switching device, 11 is a first link, 11b is a first support shaft, 13 is a second link, and 13a is a second. A support shaft, 14 is a third support shaft, 16 is an ammunition, B is a first link arm, and C is a second link arm.

Claims (1)

(57) [Claims] 1. A rotary drive of a crank arm (8) accompanying a motor drive is transmitted through a first link rod (9) so as to respond to reciprocal swing between a retracted position and a retracted position of a wiper arm. The first link (11) is swingably pivoted about a first support shaft (11b) as a fulcrum, and is connected to the first link (11) via a second support shaft (13a). A second link rod (5) pivotally supported by two links (13) and swingably interlocked with the second link (13) on the wiper arm side via a tip support shaft (6). The third support shaft (14) is pivotally supported via the third support shaft (14) so that the second link (13) can be switched between the first link (11) and the third support shaft (14). When the wiper arm is in the retracted position, the oscillating displacement about the second support shaft (13a) is oriented in the rod length direction of the second link rod (5). In the inverted position, the swing link mechanism is configured to equally divide the second link rod (5) with the tip support shaft (6) as the apex, and the swing of the second link (13) with respect to the first link (11) is performed. A switching position holding means (15) for performing switching and holding the position in the switched state is provided so as to be interposed between the first link (11) and the second link (13). Wiping range switching device for a vehicle wiper.