JPH10236282A - Wiper blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiper blade, which does not lose visibility even if an window glass, to which water repellent finishing is treated, is used for a vehicle. SOLUTION: A wiper blade 10 for wiping a water repellent window glass 21 of a vehicle is given hydrophilic coating to both side faces 13 of a main body section 11, and both of the side faces 14 of a lip section 12 are given repellent and low friction coating, and when the wiper blade 10 wipes the window glass 21, the water 20' on the surface of the window glass 21 is drawn toward the side faces 13 of the main body section 11 due to the repellence of the side face 14 of the lip section and the surface of the window glass 21 and the hydrophilic property of the side faces 13 of the main body section 11, allowing the wiper 10 to wipe the dried surface of the window glass 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a configuration of a wiper blade suitable for window glass of a vehicle or the like, in particular, a window glass subjected to a water-repellent treatment (hereinafter referred to as a water-repellent glass).

[0002]

2. Description of the Related Art As shown in FIG. 4, when a conventional wiper blade 1 wipes the surface of a vehicle water-repellent glass 2 in the direction of an arrow, the wiper blade 1 adheres to the surface of the water-repellent glass 2. The collected water is collected between the side surface of the wiper blade 1 and the surface of the water-repellent glass 2, and the collected water is collected by the wiper blade 1.
While flowing out from a slight gap between the side surface of the water-repellent glass 2 and the surface of the water-repellent glass 2, the water remaining on the wiper blade 1 is extremely thin in the section A of the surface of the water-repellent glass 2. The water in the form of a film is turned into a minute water droplet in the section B due to the water repellency of the water-repellent glass 2, and if the water enters the section C after a lapse of time,
It will completely evaporate.

However, during a few seconds in the section B immediately after the wiping of the wiper blade 1, many water droplets are present on the surface of the water-repellent glass 2 so that the water-repellent glass 2 becomes whitish from the vehicle interior. There was a problem that the visibility was low although visibility was short.

A wiper blade described in Japanese Patent Application Laid-Open No. 6-183318 has a water absorbing portion on both sides of a wiping portion, and a water repellent treatment is applied to a side surface of the water absorbing portion. Water is positively introduced from the water absorbing portion onto the surface of the window glass to lubricate the frictional interface between the wiper blade and the window glass. When the blade is actuated, as in the case of the above-described conventional apparatus, the thin film of water that lubricates the surface of the window glass is turned into fine water droplets due to the water repellency of the surface of the window glass, thereby increasing the visibility of the window glass. It will make it worse.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a wiper blade which does not impair the visibility even when used for water-repellent glass of a vehicle or the like.

[0006]

Therefore, in the wiper blade according to the present invention, at least the side surface of the lip portion that contacts the window glass has water repellency and is formed by being connected to the side surface of the lip portion. The side surface of the main body that does not contact the surface has hydrophilicity.

Therefore, when the wiper blade wipes the surface of the water-repellent glass, the water collected between the side surface of the wiper blade and the surface of the water-repellent glass becomes water-repellent on the side surface of the lip and the surface of the water-repellent glass. At the same time as being repelled by the water repellency, it is attracted by the hydrophilicity of the side of the main part connected to the side of the lip, so that water remains on the surface of the water-repellent glass with which the lip contacts, and Is moved while contacting the so-called dry state water-repellent glass surface, where little water is attached, so that water is wiped off, so the water-repellent glass surface immediately after the wiper blade is wiped off is in a dry state Since no water droplets remain, the water-repellent glass does not look whitish from the interior of the vehicle as in the related art, and the visibility of the water-repellent glass can always be kept good.

[0008]

Embodiments of the present invention will be described below. In FIG. 1, a wiper blade 10 for wiping a window glass of a vehicle or the like is formed of a main body 11 extending at right angles to the paper surface and a lip 12 connected to the tip thereof. For example, a hydrophilic coating made of nylon etc.
The contact angle between the surface of the water droplet adhering to 3 and the side surface 13 is 70 ° or less due to the hydrophilicity of the side surface 13.

A coating having both water repellency and low friction, such as fluororesin, is applied to both side surfaces 14 and the front end surface 15 of the lip portion 12 so that the surface of water droplets adhering to the side surfaces 14 is formed. The contact angle between the side surface 14 and
90 ° or more due to the water repellency of

Therefore, as shown by the two-dot chain line in FIG. 2, when the surface of the water-repellent glass 21 to which the water 20 adheres is wiped by the wiper blade 10, as shown by the solid line in FIG. The wiped water 20 ′ is repelled by the water repellency of the surface of the water-repellent glass 21 and the water repellency of the lip portion side surface 14, and at the same time, is positively activated by the hydrophilicity of the main portion side surface 13 connected to the lip portion side surface 14. Water is removed from the surface portion of the water-repellent glass 21 that is attracted and comes into contact with the lip portion side surface 14, and the collected water flows down along the main portion side surface 13. The water-repellent glass 21 is moved while being in contact with the surface of the water glass 21 and immediately after the wiper blade 10 wipes the water.
Almost no water adheres to the surface.

That is, even if the wiper blade 10 is operated at a relatively high speed with respect to the water-repellent glass 21, water does not adhere to the surface of the water-repellent glass 21 immediately after the wiper blade 10 has wiped it. Water droplets are formed on the surface of the water-repellent glass 21 due to the water repellency of the surface of the water-repellent glass 21 as in the related art, and the water-repellent glass 21 does not appear whitish from the interior of the vehicle or the like. Good visibility can always be ensured.

Even if the side surface 14 of the lip of the wiper blade 10 wipes the surface of the water-repellent glass 21 in a dry state, the side surface 14 of the lip is coated with a low-friction coating. Can wipe the surface of the water-repellent glass 21 smoothly,
Can be prevented, and the load on a wiper motor (not shown) that drives the wiper blade 10 can be easily reduced.

Further, the lip side surface 14 of the wiper blade 10 always wipes the surface of the water-repellent glass 21 in a constant dry state, and the frictional force with the surface of the water-repellent glass 21 changes particularly during the wiping. Therefore, there is an advantage that wiping performance of the wiper blade 10 can be easily enhanced by suppressing a minute vibration of the lip portion 12 during operation of the wiper blade 10, that is, a so-called chatter.

When the wiper blade 10 wipes a normal vehicle window glass that has not been subjected to a water-repellent treatment, the window glass itself is hydrophilic even if a small amount of water remains on the surface of the wiped window glass. For sex,
Since the water on the surface of the window glass spreads in a thin film form and does not form minute water droplets as in the case of the water-repellent glass, the visibility of the window glass is not particularly impaired. Part side 14
Needless to say, even if the water-repellent coating is removed, the wiper blade 10 can exhibit the same wiping performance as a normal wiper blade not subjected to the water-repellent treatment.

In the embodiment shown in FIG. 3, the main body portion 30 and the lip portion 31 made of silicone rubber are extruded in a superimposed state, and then cut into appropriate lengths to form a window for a vehicle or the like. A wiper blade 32 for wiping the glass is formed, and a hydrophilic coating made of, for example, nylon is applied to both side surfaces 33 of the main body 30.
The contact angle between the surface of the water droplet adhering to the side surface 33 and the side surface 33 is 70 ° or less due to the hydrophilicity of the side surface 33.

The lip 21 made of silicone rubber
Itself has water repellency, its both side surfaces 34 and the tip surface 35 also have water repellency, and the contact angle between the surface of the water droplet adhering to the side surface 34 and the side surface 34 is Is 90 ° or more.

Therefore, the wiper blade 32 can provide the same operation and effect as the above-described embodiment due to the hydrophilicity of the main body side surface 33 and the water repellency of the lip side surface 34 connected to the main body side surface 33.

In each of the above embodiments, a hydrophilic coating is applied to both side surfaces of the main portion. However, the main portion of the wiper blade is formed of a rubber-like material having relatively high hydrophilicity. Even if the hydrophilic coating is omitted, the same operation and effects as those of the above embodiments can be obtained.

[0019]

In the wiper blade according to the present invention, when the surface of the water-repellent glass is wiped, water collected between the side surface of the wiper blade and the surface of the water-repellent glass is removed from the side surface of the lip portion. At the same time as being repelled by the water repellency and the water repellency of the water repellent glass surface, it is attracted by the hydrophilicity of the main part side surface connected to the lip part side surface, and the lip part wipes the dry water repellent glass surface As a result, the water-repellent glass does not look whitish from the interior of the vehicle as in the past, and the visibility of the water-repellent glass can be always kept good. There is an advantage that the occurrence of chatter is also suppressed, and the wiping performance of the wiper blade can be easily increased.

[Brief description of the drawings]

FIG. 1 is an enlarged view of a main part longitudinal section in an embodiment of the present invention.

FIG. 2 is an operation explanatory view of the embodiment.

FIG. 3 is an enlarged longitudinal sectional view of a main part according to another embodiment of the present invention.

FIG. 4 is an operation explanatory view of a conventional device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Wiper blade 11 Main part 12 Lip part 20, 20 'Water 21 Water-repellent glass 30 Main part 31 Lip part 32 Wiper blade

Claims (2)

[Claims] 1. A wiper blade in which at least a side surface of a lip portion in contact with a window glass has water repellency, and a side surface of a main body portion connected to the side surface of the lip portion and not contacting the window glass has hydrophilicity. . 2. The wiper blade according to claim 1, wherein the side surface of the lip portion has low friction.