JP4042294B2 - Wiper blade for vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wiper blade for a vehicle, and more particularly to a wiper blade for a vehicle having high followability to a change in curvature of a glass surface.
[0002]
[Prior art]
Conventionally, as a vehicle wiper blade for wiping the surface of a windshield glass of an automobile or the like, there is one as shown in FIG. The vehicle wiper blade 1 includes a primary lever 2 with an intermediate portion supported at the tip of a wiper arm (not shown), a pair of secondary levers 3 and 3 with intermediate portions supported at both ends of the primary lever 2, A pair of yokes 4, 4 each having an intermediate portion supported are provided at the end portions of the pair of secondary levers 3, 3 that are close to each other.
[0003]
Further, as shown in FIG. 7, the vehicle wiper blade 1 extends across the end portions of the pair of secondary levers 3, 3 that are far from each other and the both end portions of the pair of yokes 4, 4. A blade rubber 5 for wiping the windshield glass 6 is installed. Then, on both sides of the blade rubber 5 in the thickness direction, the blade rubber 5 is uniformly bent along the longitudinal direction, and the initial shape in a state where no load is applied to the blade rubber 5 is maintained. A plate-shaped vertebra is inserted. The blade rubber 5 is held at the end portions of the secondary levers 3 and 3 and the both end portions of the yoke 4 with the vertebra attached thereto.
[0004]
[Problems to be solved by the invention]
In recent years, the shape of the windshield glass 6 has a large three-dimensional curvature change. When the above-described vehicle wiper blade 1 is applied to such a glass surface, when the vehicle wiper blade 1 moves to a curved surface having a small curvature, the blade tip 1A is windshielded as shown in FIG. There was a problem of floating from the surface of the glass 6.
[0005]
Thus, the phenomenon that the blade tip portion 1A floats is because the pressing force for causing the blade tip portion 1A to follow the surface of the windshield glass 6 cannot be generated. For this reason, in the above-described vehicle wiper blade 1, there is a possibility that the windshield glass 6 cannot be wiped at the tip portion.
[0006]
As a countermeasure for solving such a problem, it is conceivable to set the vertebra attached to the blade rubber 5 in a curved shape in advance in accordance with a curved surface having a small curvature. In this case, the intermediate portion of the blade rubber 5 is a windshield. A new problem arises that the glass 6 floats from the surface. In this case, there is a problem that the blade tip 1A rubs against the glass surface and chatter noise is generated.
[0007]
SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle wiper blade having good followability to a glass surface.
[0008]
[Means for Solving the Problems]
The invention according to claim 1 is a primary lever pivotally attached to a free end of a wiper arm, a pair of secondary levers pivotally attached to both ends of the primary lever, and an end of the secondary lever. In a vehicle wiper blade comprising a yoke rotatably attached to a portion, a sub-lever rotatably attached to at least one end of the primary lever between the primary lever and the secondary lever A blade rubber installed on the other end of the secondary lever, both ends of the yoke, and a tip of the sub lever, and a follow-up operation to the wiping surface of the yoke. And a blade pressing means for urging the tip end portion of the sub lever toward the wiping surface. A, the blade pressing means comprises an operating portion positioned inside the sub-lever, a sub lever pressing protrusions protruding toward the other to one of the operation portion or the yoke, the wiping surface of the yoke When the wiper blade moves to a position where the curvature of the wiping surface is small in accordance with the follow-up operation, the sub-lever pressing projection presses the operation portion and presses the tip end portion of the sub lever against the wiping surface side. It is characterized by energizing .
[0009]
According to the first aspect of the present invention, the sub lever is provided between the primary lever and the secondary lever so as to be rotatable at least at one end portion of the primary lever. By providing blade pressing means for urging the tip of the sub lever toward the wiping surface, the yoke can move following the wiping surface when the blade rubber reciprocates on the wiping surface having a complicated curvature shape. Since the tip end portion of the sub lever is biased toward the wiping surface, the tip end portion of the blade rubber is brought into sliding contact with the wiping surface in accordance with the change in the curvature of the wiping surface, thereby preventing the tip end of the blade rubber from being lifted.
Further, according to the present invention, the blade pressing means is constituted by an operation portion located inside the sub lever, and a sub lever pressing protrusion protruding toward the other of the operation portion or the yoke, Along with the follow-up operation to the wiping surface, the sub-lever pressing projection presses the operation unit and urges it to press the tip of the sub lever against the wiping surface. To prevent .
[0012]
According to a second aspect of the invention, a wiper blade for a vehicle according to claim 1, wherein the sub-lever pressing protrusions is characterized in that it is inserted through the opening formed in the secondary lever.
[0013]
According to the invention described in claim 2 , in addition to the operation of the invention described in claim 1 , the sub-lever pressing projection can come into contact with the sub-lever or the yoke through the opening formed in the secondary lever.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of a vehicle wiper blade according to the present invention will be described in detail with reference to the drawings.
[0015]
FIG. 1 is an exploded side view of a vehicle wiper blade 10 according to an embodiment. The vehicle wiper blade 10 is attached to a wiper arm 11 that performs a swing operation provided in a wiper drive mechanism on the vehicle body side. The vehicle wiper blade 10 includes a primary lever 12, a sub-lever 13, a proximal-side secondary lever 14 disposed on the lower end side of the windshield glass, and a distal-side secondary lever 15 disposed on the upper end side of the windshield glass. The base end side yoke 16, the front end side yoke 17, and the blade rubber 18 are roughly configured.
[0016]
The primary lever 12 is pivotally attached to the distal end portion 11A, which is the free end of the wiper arm 11, at the center in the longitudinal direction slightly curved in an arcuate shape. Further, the end lever 12A, which is the extending direction of the wiper arm 11 (shown by the arrow a in FIG. 1) of the both end portions 12A and 12B of the primary lever 12, the sub lever 13 and the tip side secondary lever 15 both have the same support shaft. It is attached so as to be rotatable around the center. From another point of view, the sub lever 13 is located on the same axis as the rotation support shaft of the secondary lever 15 between the primary lever 12 and the secondary lever 15 at least at one end portion 12A on the distal end side of the primary lever 12. It is mounted rotatably as. Note that the distal end portion 13A of the sub lever 13 protrudes in the extending direction from the distal end portion 15A of the distal end side secondary lever 15.
[0017]
In addition, a proximal-side secondary lever 14 is rotatably attached to the other end portion 12B disposed on the proximal end side of the wiper arm 11 among the both end portions 12A and 12B of the primary lever 12. Further, of the both end portions 14A and 14B of the base end side secondary lever 14, a base end side yoke 16 is rotatably attached to one end portion 14B disposed between the both end portions 12A and 12B of the primary lever 12. ing. And the front end side yoke 17 is attached to one end part 15B arrange | positioned between the both ends 12A and 12B of the primary lever 12 in the front end side secondary lever 15 so that rotation is possible.
[0018]
In the present embodiment, as shown in FIG. 1, the sub-lever is pressed toward the direction opposite to the wiping surface (sub-lever 13 side) on the outer side (extension direction side) of the support shaft serving as the pivot point of the tip side yoke 17. A protrusion 19 is provided to protrude. The secondary lever 15 corresponding to the sub lever pressing protrusion 19 is provided with a protrusion insertion hole 15C through which the sub lever pressing protrusion 19 is inserted. The tip of the sub-lever pressing projection 19 can be brought into contact with the lower surface of the operation portion 13B located on the inner side of the support shaft that serves as a rotation fulcrum of the sub-lever 13.
[0019]
The blade rubber 18 includes the distal end portion 14A of the proximal end side secondary lever 14, the both end portions 16A and 16B of the proximal end side yoke 16, the both end portions 17A and 17B of the distal end side yoke 17, and the distal end side secondary lever 15. The front end portion 15A and the front end portion 13A of the sub lever 13 are held (built). The blade rubber 18 is provided with a reinforcing plate material such as a vertebra (not shown).
[0020]
In the vehicular wiper blade 10 having such a configuration, the curvature of the glass surface that is the wiping surface changes with the reciprocating swinging operation, whereas the front end portion of the sub lever 13 that is the front end portion of the vehicular wiper blade 10. 13A has the effect of following the glass surface. That is, as shown in FIGS. 2 (a) and 5 (a), when the radius of curvature of the glass surface G is large and flat, the pressing force from the wiper arm 11 is pushed through the both end portions 12A and 12B of the primary lever 12. Is transmitted substantially uniformly to the side secondary lever 15 and the base end side secondary lever 14 and is also approximately even to the tip end side secondary lever 15, the tip end side yoke 17 and the base end side yoke 16 supported by the base end side secondary lever 14, respectively. The pressing force is distributed and transmitted.
[0021]
At this time, the front end yoke 17 is subjected to a pressing force similar to that of the front end portion 15A of the front end side secondary lever 15, so that the front end side yoke 17 and the primary lever 12 are in a normal state relatively separated from each other. . For this reason, the blade rubber 18 is also linear with respect to the flat glass surface, and the entire blade rubber 18 is in a state of being uniformly pressed against the glass surface.
[0022]
When the radius of curvature of the glass surface G is large and flat, the tip side yoke 17 is not pushed up by the reaction force from the glass surface G side as shown in FIG. The operation part 13B of the sub lever 13 is not pushed up by the sub lever pressing projection 19. Therefore, the tip end portion 13A of the sub lever 13 does not rotate to the glass surface G side, and the blade rubber 19 is maintained in a straight line state that matches the surface state of the glass surface G, thereby providing a good wiping action.
[0023]
On the other hand, as shown in FIGS. 2B and 5B, when the wiper arm 11 swings and moves to a position where the curvature of the glass surface G is small (the degree of curvature is large), the raised glass The front end side yoke 17 in contact with the surface G receives the reaction force pressed against the glass surface G by the wiper arm 11 from the glass side and approaches the primary lever 12, and accordingly, FIG. 4 (B-B cross section in FIG. 2). As shown in the figure, the tip of the sub-lever pressing projection 19 pushes up the operating portion 13B of the sub-lever 13.
[0024]
As a result, the tip end portion 13A of the sub lever 13 is urged to rotate in the direction of arrow F shown in FIG. For this reason, the blade rubber 19 held by the tip portion 13A of the sub lever 13 and the tip portion 15A of the tip side secondary lever 15 is prevented from being pressed against the glass surface G and floating. Even in this case, since the shape of the blade rubber 19 is adapted to the curved state of the glass surface G, a good wiping action is exerted over the entire blade rubber 19.
[0025]
Although the embodiment has been described above, the present invention is not limited to this, and various modifications accompanying the gist of the configuration of the present invention are possible. For example, in the above-described embodiment, the sub-lever pressing projection 19 is provided on the tip side yoke 17, but the sub-lever pressing projection 19 may be provided on the operation portion 13B of the tip side sub lever 13. Further, the same effect can be obtained by providing the sub lever 13 between the base end side secondary lever 15 and the primary lever 12 and providing the sub lever pressing projection 19 that abuts on the operation portion 13B of the sub lever 13. By doing so, it is possible to prevent the blade rubber tip from being lifted in both the lower end portion and the upper end portion of the glass surface G.
[0026]
【The invention's effect】
As is apparent from the above description, according to the first aspect of the present invention, the sub lever is provided between the primary lever and the secondary lever so as to be rotatable at least at one end portion of the primary lever. Since the blade pressing means for urging the tip of the sub lever toward the wiping surface along with the follow-up operation to the wiping surface is provided, when the blade rubber reciprocates on the wiping surface having a complicated curvature shape, the yoke Since it moves following the wiping surface and the tip of the sub lever is biased toward the wiping surface, the tip of the blade rubber is always in sliding contact with the wiping surface according to the change in the curvature of the wiping surface. And the occurrence of wiping unevenness can be prevented by preventing the tip of the blade rubber from being lifted.
[0027]
Further, according to the first aspect of the invention, the other in addition to the effect of the first aspect, the blade pressing means, an operation portion positioned on the inner side of the sub-lever, to one of the operating portion or yoke And a sub-lever pressing projection that protrudes toward the wiping surface, so that the sub-lever pressing projection presses the operation portion and presses the tip of the sub-lever against the wiping surface side as the yoke follows the wiping surface. Therefore, it is possible to prevent the blade rubber tip from being lifted with a simple device configuration.
[0028]
In the invention according to claim 2 , in addition to the effect of the invention according to claim 1 , the sub lever pressing projection can come into contact with the sub lever or the yoke through the opening formed in the secondary lever. Can be prevented from interfering with the sub-lever pressing projections even if they are supported on the same tip of the primary lever.
[Brief description of the drawings]
FIG. 1 is an exploded side view showing an embodiment of a vehicle wiper blade according to the present invention.
2A is an explanatory side view in a state where a glass surface of a flat portion is wiped off, and FIG. 2B is an explanatory side view in a state where the degree of bending is large.
3 is a cross-sectional view taken along the line AA in FIG.
4 is a cross-sectional view taken along the line BB in FIG. 2 (b).
5A is a side view in a state where a glass surface of a flat portion is wiped off, and FIG. 5B is a side view in a state where the degree of curvature is large.
FIG. 6 is an exploded side view of a main part of a conventional wiper blade for a vehicle.
FIG. 7 is a cross-sectional view of a main part of a conventional vehicle wiper blade.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Vehicle wiper blade 11 Wiper arm 12 Primary lever 13 Sub lever 13B Operation part 14 Base end side secondary lever 15 Front end side secondary lever 15C Protrusion insertion hole (opening part)
16 Base end side yoke 17 Front end side yoke 18 Blade rubber 19 Sub lever pressing projection

Claims (2)

A primary lever pivotally attached to the free end of the wiper arm;
A pair of secondary levers rotatably attached to both ends of the primary lever,
In the vehicle wiper blade comprising a yoke rotatably attached to the end of the secondary lever,
A sub-lever that is rotatably attached to at least one end of the primary lever between the primary lever and the secondary lever;
Blade rubbers respectively erected on the other end located outside the secondary lever, both ends of the yoke, and a tip located outside the sub lever;
A blade pressing means for urging the tip end portion of the sub lever toward the wiping surface in accordance with the follow-up operation to the wiping surface of the yoke ;
The blade pressing means includes an operation portion located inside the sub lever, and a sub lever pressing protrusion protruding toward the other of the operation portion or the yoke, and follows the wiping surface of the yoke. In accordance with the operation, when the wiper blade moves to a position where the curvature of the wiping surface is small, the sub-lever pressing projection presses the operation portion and biases the tip end portion of the sub lever against the wiping surface. A wiper blade for a vehicle. The vehicle wiper blade according to claim 1 ,
The vehicular wiper blade, wherein the sub-lever pressing protrusion is inserted into an opening formed in the secondary lever.

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