JPH0597014A - Wiper blade rubber and molding die therefor - Google Patents

Abstract

PURPOSE:To provide wiper blade rubber for a wiper device emitting small reversing sounds. CONSTITUTION:A mounting part 3 having a slit 3c to detain a packing 2 of a leaf spring for holding at a wiper blade is furnished in the upper part, and a stopper part 6 is installed under this mounting part 3 in continuity thereto. The stopper part 6 is fitted in continuity with a lip 8 having an approx. triangular section with a neck 7, and each shoulder 11 of the lip 8 is located closely to the under-wall 5 of the stopper 6. A notch 12 to sink the rigidity of each shoulder 11 is provided in its over-edge.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper blade rubber for a wiper device for wiping a windshield of an automobile and the like, and a molding die for the wiper blade rubber.

[0002]

2. Description of the Related Art In automobiles, for example, a wiper device is used for wiping a windshield glass or a headlamp lens surface.

In this wiper device, a wiper blade is attached to the tip of a wiper arm, and a wiper blade rubber made of rubber or the like for wiping the windshield glass surface is attached to the wiper blade.

The wiper blade rubber 1 is provided with a slit-shaped mounting portion 3 for locking the packing 2 of the leaf springs for supporting the wiper blade rubber 1 on the wiper blade, as shown in FIG. On the lower side, the upper wall 4 is lowered slightly downward, and the lower wall 5 is provided with stopper portions 6 which are substantially horizontal and extend on both sides.

A narrow neck portion 7 is provided on the lower wall 5 of the stopper portion 6, and a substantially triangular lip portion 8 is provided below the neck portion 7.

An edge portion 10 is provided at the lower end of the lip portion 8 for contacting and wiping the surface of the windshield 9 and the like, and both shoulder portions 11 of the lip portion 8 are directed toward the lower wall 5 of the stopper portion 6. It is formed so as to extend obliquely upward (this type of structure is shown, for example, in "Automotive Engineering Complete Book", Vol. 10, p. 128, published by Sankaido Co., Ltd. in 1980).

[0007]

Since the wiper blade rubber 1 can be easily tilted due to the elastic deformation of the neck portion 7, the surface of the windshield 9 and the like can be wiped smoothly. However, the lip of the wiper blade rubber 1 can be wiped. As shown in FIG. 4, the tilting of the portion 8 is regulated by one of the shoulder portions 11 abutting against the stopper portion 6, so that when the wiper blade rubber 1 is reversed, the other shoulder portion 11
Collide with the stopper portion 6, and the shoulder portion 11 and the stopper portion 6
There is a problem that a large reversal sound is generated because there is a difference in the distance L between the lower wall 5 and the lower wall 5 when it is upright.

Therefore, an object of the present invention is to provide a wiper blade rubber capable of reducing reversal noise, and further to provide a molding die having high strength for producing the wiper blade rubber. To do.

[0009]

In order to achieve the above object, in the wiper blade rubber of the present invention, an attaching portion fixed to the wiper blade and a narrow neck portion on the lower wall of the attaching portion are provided. A wiper blade rubber provided with a lip portion having a substantially triangular cross-section provided with a notch portion at the upper edge of the shoulder portion of the lip portion.

Further, as the mold for the wiper blade rubber, a pair of molds can be moved close to and away from each other on a surface that includes the longitudinal direction of the wiper blade rubber and is perpendicular to the surface to be wiped,
A rib provided from the fin portion of each molding die that forms the space between the shoulder portion of the lip portion of the wiper blade rubber and the lower wall of the mounting portion toward the groove portion that forms the shoulder portion of the wiper blade rubber To use.

[0011]

With the wiper blade rubber configured as described above, the distance between the shoulder portion and the lower wall of the mounting portion can be set small, so that when the wiper blade is reversed, the shoulder portion collides with the lower wall of the mounting portion. The striking sound at the time of contact is reduced, and the notch provided on the shoulder reduces the rigidity of the shoulder to reduce the impact when the shoulder collides with the lower wall of the mounting part and improves drainage performance. To do.

Further, in this mold for the wiper blade rubber, the rib for molding the cutout portion of the wiper blade rubber enhances the strength of the mold.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a wiper blade rubber 1 used in a wiper device for a windshield of an automobile.

The wiper blade rubber 1 is composed of a wiper blade mounting portion 3 (not shown), a stopper portion 6 and a lip portion 8 which are also mounting portions.

The mounting portion 3 has slits for locking the packing 2 of the leaf spring for supporting the wiper blade (not shown) on both sides between the first overhanging portion 3a and the second overhanging portion 3b extending laterally. 3c is provided.

A stopper portion 6 is connected to the second projecting portion 3b, and the stopper portion 6 has a shape in which the upper wall 4 is slightly lowered and the lower wall 5 is substantially horizontal and extends on both sides. ..

A narrow neck portion 7 is provided on the lower wall 5 of the stopper portion 6, and a substantially triangular lip portion 8 is provided on the neck portion 7.

The lip portion 8 is provided at its lower end with an edge portion 10 that abuts against the surface of the windshield 9 and wipes it. Both shoulder portions 11 of the lip portion 8 face the lower wall 5 of the stopper portion 6. It is formed by extending diagonally upward.
The rib 20 formed from the third fin 18 to the groove portion of the molding die 13 described below can thin the base portion 18a of the third fin 18, so that the distance M between the tip of each shoulder 11 and the stopper portion 6 is reduced (M <L) Can be set. Further, notches 12 are provided at the upper edge of each shoulder 11 at a predetermined interval.

According to the structure of the above embodiment, the edge portion of the lip portion 8 is operated in a state where the wiper device is operated and one shoulder portion 11 of the lip portion 8 of the wiper blade rubber 1 is in contact with the lower wall 5 of the stopper portion 6. Windshield 9 by 10
When the wiper blade rubber 1 is reversed while the wiper is being wiped, the other shoulder portion 11 of the lip portion 8 abuts the lower wall 5 of the stopper portion 6, but at this time, the shoulder portion 11 and the stopper portion 6 are
Since the distance M between the shoulder portion 11 and the stopper portion 6 is small.
The impact noise that hits the lower wall 5 of the lower part becomes smaller. And further,
Since the notch 12 is provided at the upper edge of the shoulder portion 11, the rigidity of the shoulder portion 11 is correspondingly reduced, and therefore the impact noise is further reduced. Further, the cutout portion 12 enhances the drainability of water accumulated in the space K2 between the stopper portion 6 and the shoulder portion 11.

Next, the structure of the mold 13 for the wiper blade rubber 1 will be described with reference to FIG. This molding die 13 is configured by arranging a pair of molding dies 14 and 14 so as to be able to approach and separate from each other. Is set on the surface 9b perpendicular to the windshield glass surface 9a as the surface to be wiped.

In each molding die 14, the wiper blade rubber 1 is provided below the first fin 16 which forms the slit 3c of the wiper blade rubber 1 in the portion where the cavity 15 is formed.
Space K1 between the second overhanging portion 3b and the stopper portion 6 of
A second fin 17 that forms (shown in FIG. 1) is provided, and below this second fin 17, a space K2 (shown in FIG. 1) between the stopper portion 6 and the shoulder portion 11 of the wiper blade rubber 1. The third fin 18 is provided as a fin portion that forms the groove portion, and the groove portion 19 that forms the shoulder portion 11 is provided below the third fin 18. Then, the third fin 18
A rib 20 that forms the cutout portion 12 of the wiper blade rubber 1 is provided from the groove portion 19 to the groove portion 19.

According to the structure of the molding die 13, the shoulder portion 11 of the wiper blade rubber 1 has the lower wall 5 of the stopper portion 6.
The base portion 18a of the third fin 18 becomes thin due to the proximity to the third fin 18, and thus the molding die 1
Although the rigidity of No. 4 becomes low, the rib 20 forming the notch 12 of the shoulder 11 of the wiper blade rubber 1 has a function of reinforcing the third fin 18, so that the rigidity of the mold 14 or the mold 13 is increased. be able to.

In this way, the wiper blade rubber 1
The modification of the shape of the mold 14 caused by the improvement of the mold increases the strength of the mold 14.

The embodiment of the present invention is not limited to the wiper blade rubber applied to the windshield windshield wiper device of an automobile and its molding die, but may be other than automobiles, headlamp wiper device, back door. The present invention can also be applied to a wiper blade rubber related to a wiper device for a vehicle and a mold thereof.

[0026]

As described above, according to the first aspect of the present invention, the noise generated when the wiper blade is reversed and the shoulder of the lip and the lower wall of the stopper collide is reduced. A quiet wiper device can be obtained, and the water accumulated between the stopper portion and the shoulder portion can be smoothly drained by the cutout portion.

According to the invention described in claim 2,
Since the fins are reinforced by the ribs for forming the cutouts of the wiper blade rubber, the strength and rigidity of the molding die can be increased.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the invention described in claim 1. FIG.

FIG. 2 is a perspective view of an embodiment of the invention described in claim 2.

FIG. 3 is a cross-sectional view of a conventional technique.

FIG. 4 is a cross-sectional view showing an operating condition of a conventional technique.

[Explanation of symbols]

1 ... Wiper blade rubber, 3 ... Mounting part, 5 ... Lower wall, 6
... stopper part, 7 ... neck part, 8 ... lip part, 9a ... surface to be wiped (front window glass surface), 9b ... vertical surface, 11 ... shoulder part, 12 ... notch part, 14 ... mold, 18 ...
Third fin (fin portion), 19 ... Groove portion, 20 ... Rib, K
2 ... space, M ... distance.

Claims (2)

[Claims] 1. A mounting portion fixed to a wiper blade,
In a wiper blade rubber provided with a lip portion having a substantially triangular cross section provided on a lower wall of this attachment portion via a narrow neck portion, a notch portion is provided on an upper edge of a shoulder portion of the lip portion. Characteristic wiper blade rubber. 2. A pair of molding dies are configured to be able to come close to and separate from each other on a surface which includes a longitudinal direction of the wiper blade rubber and is perpendicular to a surface to be wiped, and a shoulder portion of a lip portion of the wiper blade rubber and a lower wall of an attachment portion. A mold for a wiper blade rubber, characterized in that ribs are provided from a fin portion of each mold for molding a space portion between the grooves toward a groove portion for molding a shoulder portion of the wiper blade rubber.