JP3946850B2 - Pneumatic tire with an annular decorative body consisting of many ridges - Google Patents

Pneumatic tire with an annular decorative body consisting of many ridges Download PDF

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Publication number
JP3946850B2
JP3946850B2 JP00600398A JP600398A JP3946850B2 JP 3946850 B2 JP3946850 B2 JP 3946850B2 JP 00600398 A JP00600398 A JP 00600398A JP 600398 A JP600398 A JP 600398A JP 3946850 B2 JP3946850 B2 JP 3946850B2
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Japan
Prior art keywords
ridge
radial
decorative body
pneumatic tire
region
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JP00600398A
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Japanese (ja)
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JPH11198614A (en
Inventor
忍 板橋
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Bridgestone Corp
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Bridgestone Corp
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Description

【0001】
【発明の属する技術分野】
本発明は空気入りタイヤに関するもので、特に、サイドウオールの表面に、周方向に小さな間隔を置いて設けられた多数の小さなリッジよりなる環状の装飾体を備えた空気入りタイヤに関するものである。
【0002】
【従来の技術】
空気入りタイヤは、トロイド状またはドーナツ状の円環体であるが、一般に、そのカーカスは初めから円環体として製造されるのではなく、まずシート状に製造されたカーカス・プライがタイヤの成型ドラム上で一周回転されて、巻初めと巻終わりの個所がジョイントされることによって円環状に張り付けられる。その後、チェーファー、ブレーカーまたはベルトおよびトレッドなどの必要な構造部材が張り付けられて成型された生タイヤが、スチールやアルミニュームなどの金属よりなるモールド内で一定時間加圧・加熱されて、加硫されることによってタイヤが製造されている。
その結果、加硫後のタイヤのサイドウオールには、カーカス・プライの巻初めと巻終わりのジョイント部に相当する個所に、大なり小なり、凹凸が生じる。このサイドウオールの凹凸は、タイヤの性能面や耐久面では致命的な欠陥ではないが、カーカス・プライが1プライよりなる乗用車用ラジアル・タイヤなどでは、サイドウオールの凹凸が相対的に顕著に目立って、顧客に要らざる不安感を与えることがある。
また、空気入りタイヤは、一般に、左右一対のビード・コアーを備えていて、カーカス・プライがこのビード・コアーを内側から外側に折り返されてビード部に係留されているので、カーカス・プライの折り返し端部がサイドウオールに位置し、その外側にサイドゴムが配置されている。タイヤの軽量化等の要請を受けて、サイドゴムが薄くなると、カーカス・プライの折り返し端部がサイドウオールの凹凸として相対的に目立ってくることがある。
【0003】
【発明が解決しようとする課題】
タイヤのサイドウオールに形成された、文字、数字、記号又は図形などよりなるトレードマークやトレードドレスなどを目立させるために、従来から、サイドウオールの表面に、周方向に等間隔に設けられた多数の小さな、同じ高さのリッジよりなる環状の装飾体を備え、この装飾体の上に、文字や図形などを設けることが行われている。
発明者は、タイヤのサイドウオールに生じる上記の凹凸を目立たなくするために、トレードマークやトレードドレスなどを目立たさせるために設けられた上記の小さなリッジをタイヤのサイドウオールの広範囲にわたって形成することを思いついた。
しかしながら、従来公知の上記のようなリッジをサイドウオールの広範囲にわたって形成してみたが、結果的に、タイヤのサイドウオールに生じる上記の凹凸を目立たなくすることにおいて、予期した効果が得られなかった。
また、タイヤのサイドウオールにリッジを形成するためには、モールドに凹部を形成する必要があり、この凹部形成加工の際バイトの刃先が次第に摩滅し、凹部の掘り初めと掘り終わりとでは凹部の断面形状に差が生じて、モールド一周の加工が終わったときに、掘り初めと掘り終わりの隣接個所が不均一な模様となって外観上好ましくない。
【0004】
本発明の目的は、上記のような従来技術の不具合を解消して、タイヤのサイドウオールに生じる凹凸を目立たなくするとともに、モールドに凹部を形成する際バイトの刃先が次第に摩滅し掘り初めと掘り終わりの隣接個所に生じるタイヤの外観不良を目立たなくするようなリッジをサイドウオールに備えた空気入りタイヤを提供することである。
【0005】
【課題を解決するための手段】
上記目的を達成するために、周方向に0.3乃至5mmの間隔をおいて設けられた、高さが0.3乃至2mmの多数の小さなリッジよりなる円環状装飾体を少なくとも一方のサイドウオールの表面に備えた空気入りタイヤにおいて、
(1)前記円環状の装飾体は、ラジアル方向外側に位置する外側領域、中間領域およびラジアル方向内側に位置する内側領域よりなる少なくとも3ヶ所の領域で構成され、該中間領域のラジアル方向の幅が、該外側領域および該内側領域のラジアル方向の幅に比べて同等以下であり、該リッジが伸びる方向に直角方向のリッジ間隔が、それぞれの領域内では同一で、領域間ではラジアル方向外側に向けて不連続に段階的に増加または減少しているものであり、
(2)前記リッジは、該円環状の装飾体のラジアル方向内側端縁から外側端縁までの間で、連続して互いに平行に延びて、周方向に測定したリッジ間隔が同じになる、ことを特徴とする空気入りタイヤである(請求項1)。本発明による空気入りタイヤは、このような構成のタイヤであるので、リッジが従来のように直線または曲線だけの単調なデザインではなく、直線のリッジと曲線のリッジが上記のように組み合わされているので、光と影のバランスや反射光の強弱が微妙に変化し、視線が分散されることによって、タイヤのサイドウオールに生じる前記の凹凸が目立たなくなるとともに、モールドに凹部を形成する際、バイトの刃先が次第に摩滅し掘り初めと掘り終わりの隣接個所に生じるタイヤの外観不良も目立たなくなる。
【0006】
上記目的を達成するために、本発明による空気入りタイヤでは、該リッジが直線状または曲線状に延びていることにより光と影のバランスや反射光の強弱が微妙に変化して、サイドウオールに生じる前記の凹凸やタイヤの外観不良が目立たなくなることに効果的であるために、好ましい(請求項 2 )。
【0007】
上記目的を達成するために、本発明による空気入りタイヤでは、リッジが延びる方向に直角方向のリッジ間隔が、該円環状装飾体のラジアル方向外側端縁近傍で 0.8 乃至 5mm 、好ましくは 1 乃至 3mm であり、ラジアル方向内側端縁で 0.6 乃至 2mm 、好ましくは 0.8 乃至 1.5mm であってもよいが(請求項 3 )、リッジが延びる方向に直角方向のリッジ間隔が、該円環状装飾体のラジアル方向内側端縁で 0.8 乃至 5mm 、好ましくは 1 乃至 3mm であり、ラジアル方向外側端縁で 0.6 乃至 2mm 、好ましくは 0.8 乃至 1.5mm であってもよい(請求項 4 )。
【0008】
上記目的を達成するために、本発明による空気入りタイヤでは、3ヶ所の領域は、ラジアル方向の幅がそれぞれ周上同一で、同心円状の円環体を形成していること(請求項 5 )、および3ヶ所の領域は、該円環状装飾体のラジアル方向の幅に対して 3 乃至 20 %、好ましくは 5 乃至 10 %程度の小さな幅の領域と、該円環状の装飾体のラジアル方向の幅に対して 40 乃至 90 %、好ましくは 50 乃至 70 %程度の大きな幅の領域とで形成されていること(請求項 6 )が光と影のバランスや反射光の強弱が微妙に変化して、サイドウオールに生じる前記の凹凸やタイヤの外観不良が目立たなくなることに効果的であるために、好ましい。
【0010】
【発明の実施の形態】
以下、本発明にしたがう実施例の空気入りタイヤについて図面を参照して説明する。
【0011】
図1は、本発明による実施例1のタイヤのサイドウオールに備えられた円環状装飾体Sの一部正面図で、タイヤのサイドウオールの表面に、周方向に0.8mm程度の小さな間隔を置いて周上等間隔に設けられた、高さが0.4mm程度の多数の小さなリッジrよりなる円環状の装飾体を備えている。
リッジrは、円環状の装飾体Sのラジアル方向内側端縁Mから外側端縁Nまでの間で、連続して互いにほぼ平行に延びて、周方向に測定したリッジ間隔がほぼ同じである。
円環状の装飾体Sのラジアル方向内側端縁Mから外側端縁Nに向けて、ラジアル方向に対するリッジrの傾斜角度が減少することによって、リッジrが延びる方向に直角方向に測定したリッジ間隔がd1 =0.9mmからd2 =1.3mmへ、d2 =1.3mmからd3 =2.5mmへと増加している。
リッジrが延びる方向に直角方向のリッジ間隔d1 、d2 、d3 が、円環状の装飾体Sのラジアル方向内側端縁Mからラジアル方向外側端縁Nに向けて、不連続に段階的に増加している。
リッジrは直線状に延びている。
円環状装飾体Sは、ラジアル方向内側に位置する内側領域T1 、中間領域T2 およびラジアル方向外側に位置する外側領域T3 よりなる少なくとも3ヶの領域で構成され、リッジが延びる方向に直角方向のリッジ間隔が、それぞれの領域内では同一で、領域間ではラジアル方向外側に向けて増加している。
3ヶの領域T1 、T2 、T3 は、ラジアル方向の幅D1 =18mm、D2 =5mm、D3 =21mmがそれぞれ周上同一であって、同心円状の円環体を形成している。
3ヶの領域T1 、T2 、T3 の幅D1 、D2 、D3 は、円環状の装飾体Sのラジアル方向の幅D=44mmに対して41%、11%、48%であり、小さな幅の領域T2 と大きな幅の領域T1 、T3 とで形成されている。
【0012】
図2は本発明による実施例2のタイヤのサイドウオールに備えられた円環状装飾体Sの一部正面図で、3ヶの領域T1 、T2 、T3 のうちT2 およびT3 におけるリッジrが延びる方向がラジアル方向を挟んで正反対であることを除いて、上記実施例1のタイヤと同じである。すなわち、実施例1のタイヤでは3ヶの領域T1 、T2 およびT3 でリッジrが右上がり、左上がりおよび左上がりに延びているが、実施例2のタイヤでは3ヶの領域T1 、T2 およびT3 のすべてでリッジrがすべて右上がりに延びていることを除いて、上記実施例1のタイヤと同じである。
【0014】
【発明の効果】
本発明の空気入りタイヤは、従来のタイヤと比べ、タイヤのサイドウオールに生じる凹凸を目立たなくするとともに、モールドに凹部を形成する際バイトの刃先が次第に摩滅し掘り初めと掘り終わりの隣接個所に生じるタイヤの外観不良を抑制する効果がある。
【図面の簡単な説明】
【図1】本発明による実施例のタイヤの装飾体の一部正面図である。
【図2】本発明による実施例のタイヤの装飾体の一部正面図である。
【符号の説明】
r リッジ
S 円環状の装飾体
M ラジアル方向内側端縁
N ラジアル方向外側端縁
d リッジ間隔
d1 リッジ間隔
d2 リッジ間隔
d3 リッジ間隔
T1 内側領域
T2 中間領域
T3 外側領域
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pneumatic tire, and more particularly to a pneumatic tire provided with an annular decorative body made up of a large number of small ridges provided on the surface of a side wall at small intervals in the circumferential direction.
[0002]
[Prior art]
A pneumatic tire is a toroidal or donut-shaped torus, but in general, the carcass is not manufactured as a torus from the beginning, but first the carcass ply manufactured in the form of a sheet is molded into the tire. It is rotated around the drum and is pasted in an annular shape by jointing the beginning and end of the winding. After that, raw tires molded by attaching necessary structural members such as chafers, breakers or belts and treads are pressed and heated for a certain period of time in a mold made of metal such as steel or aluminum, and vulcanized. Thus, a tire is manufactured.
As a result, the side wall of the vulcanized tire is more or less uneven at portions corresponding to the joints at the beginning and end of the carcass ply. Although the unevenness of the side wall is not a fatal defect in terms of performance and durability of the tire, the unevenness of the side wall is relatively conspicuous in radial tires for passenger cars with one carcass ply. Can cause unnecessary anxiety to customers.
In general, a pneumatic tire has a pair of left and right bead cores, and the carcass ply is folded back from the inside to the outside and moored to the bead portion. The end portion is located on the side wall, and the side rubber is disposed on the outside thereof. When the side rubber becomes thin in response to a request for weight reduction of the tire, the folded end portion of the carcass ply may become relatively conspicuous as the unevenness of the side wall.
[0003]
[Problems to be solved by the invention]
Conventionally, on the surface of the side wall, it has been provided at equal intervals in the circumferential direction in order to make a trademark or a trade dress made up of letters, numbers, symbols or figures formed on the side wall of the tire stand out. A large number of small ring-shaped decorative bodies made of ridges having the same height are provided, and characters and figures are provided on the decorative body.
In order to make the unevenness generated in the tire side wall inconspicuous, the inventor has to form the small ridge provided to make a trademark, a trade dress, etc. conspicuous over a wide range of the tire side wall. came up with.
However, the conventional ridges as described above were formed over a wide area of the side wall, but as a result, the expected effect was not obtained in making the above unevenness generated in the side wall of the tire inconspicuous. .
In addition, in order to form a ridge on the tire sidewall, it is necessary to form a recess in the mold, and the cutting edge of the cutting tool gradually wears during the recess forming process, and the recess is not formed at the beginning and end of the recess. When a difference occurs in the cross-sectional shape and the processing of one round of the mold is finished, the adjacent portions at the beginning and the end of the digging become a non-uniform pattern, which is not preferable in appearance.
[0004]
The object of the present invention is to eliminate the above-mentioned problems of the prior art, to make the unevenness generated in the tire sidewall inconspicuous, and when the recess is formed in the mold, the cutting edge of the bite is gradually worn out and the initial digging is performed. It is an object of the present invention to provide a pneumatic tire having a side wall with a ridge that makes an appearance defect of a tire generated at an adjacent portion at the end inconspicuous.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, at least one side wall surface is provided with an annular decorative body made of a large number of small ridges having a height of 0.3 to 2 mm, provided at intervals of 0.3 to 5 mm in the circumferential direction. In a pneumatic tire
(1) The annular decorative body is composed of at least three regions including an outer region located outside in the radial direction, an intermediate region, and an inner region located inside in the radial direction, and the width of the intermediate region in the radial direction. Is equal to or less than the radial width of the outer region and the inner region, and the ridge spacing in the direction perpendicular to the direction in which the ridge extends is the same in each region, and radially outward between the regions. Which increases or decreases in a discrete and stepwise manner,
(2) The ridges extend continuously in parallel from the radial inner edge to the outer edge of the annular decorative body, and the ridge intervals measured in the circumferential direction are the same. A pneumatic tire characterized by the above (claim 1). Since the pneumatic tire according to the present invention is a tire having such a configuration, the ridge is not a monotonous design with only a straight line or a curve as in the prior art, but a straight ridge and a curved ridge are combined as described above. Therefore, the balance between light and shadow and the intensity of reflected light change slightly, and the line of sight is dispersed, so that the unevenness generated in the tire sidewall becomes inconspicuous, and when forming a recess in the mold, The cutting edge of the tire gradually wears out, and the appearance defect of the tire that occurs in the adjacent portions at the beginning and end of digging becomes inconspicuous.
[0006]
In order to achieve the above object, in the pneumatic tire according to the present invention, the balance of light and shadow and the intensity of reflected light are slightly changed due to the ridge extending in a straight line or a curved line. This is preferable because it is effective in making the unevenness and the appearance failure of the tire inconspicuous (claim 2 ).
[0007]
To achieve the above object, in the pneumatic tire according to the present invention, a ridge perpendicular direction of the ridge spacing in a direction extending there is, 0.8 to 5mm in radial outer edge vicinity of the circular annular decorative body, preferably 1 to 3mm , and the 0.6 to 2mm in the radial direction inner edge, preferably may be 0.8 to 1.5 mm (claim 3), the ridge spacing perpendicular to the direction in which the ridge extends is a radial of the circular annular decorative body 0.8 to 5mm in the direction inner edge, preferably 1 to 3 mm, 0.6 to 2mm in the radial direction outer edge, preferably be 0.8 to 1.5 mm (claim 4).
[0008]
In order to achieve the above object, in the pneumatic tire according to the present invention, the three regions have the same radial width in the circumferential direction and form concentric circular rings (Claim 5 ). , the region of and three plants, 3 to 20% the radial width of the circular ring decorative body, preferably a region of small width of about 5 to 10%, of the circular annular decorations radial of 40 to 90% of the width, preferably to slightly change the intensity that has been formed (claim 6) of light and shadow balance and of the reflected light in the region of the large width of about 50 to 70% It is preferable because it is effective in making the unevenness and the appearance defect of the tire generated in the side wall inconspicuous.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a pneumatic tire according to an embodiment of the present invention will be described with reference to the drawings.
[0011]
FIG. 1 is a partial front view of an annular decorative body S provided on a side wall of a tire according to a first embodiment of the present invention. A small interval of about 0.8 mm in the circumferential direction is provided on the surface of the side wall of the tire. An annular decorative body made up of a large number of small ridges r having a height of about 0.4 mm is provided.
The ridges r continuously extend substantially parallel to each other from the radial inner end edge M to the outer end edge N of the annular decorative body S, and the ridge intervals measured in the circumferential direction are substantially the same.
As the inclination angle of the ridge r with respect to the radial direction decreases from the radial inner edge M to the outer edge N of the annular decorative body S, the ridge interval measured in the direction perpendicular to the direction in which the ridge r extends is increased. It increases from d1 = 0.9 mm to d2 = 1.3 mm and from d2 = 1.3 mm to d3 = 2.5 mm.
Ridge intervals d1, d2, and d3 perpendicular to the direction in which the ridge r extends increase in a stepwise manner from the radially inner edge M to the radially outer edge N of the annular ornament S. ing.
The ridge r extends linearly.
The ring-shaped decorative body S is composed of at least three regions including an inner region T1 positioned radially inward, an intermediate region T2, and an outer region T3 positioned radially outward, and a ridge perpendicular to the direction in which the ridge extends. The spacing is the same in each region and increases outward in the radial direction between the regions.
The three regions T1, T2, and T3 have radial widths D1 = 18 mm, D2 = 5 mm, and D3 = 21 mm, respectively, and have the same circumference, forming a concentric ring.
The widths D1, D2, and D3 of the three regions T1, T2, and T3 are 41%, 11%, and 48%, respectively, with respect to the radial width D = 44 mm of the annular decorative body S. It is formed by T2 and wide regions T1 and T3.
[0012]
FIG. 2 is a partial front view of the annular decorative body S provided on the side wall of the tire according to the second embodiment of the present invention. The direction in which the ridge r extends in T2 and T3 among the three regions T1, T2, and T3. Is the same as the tire of Example 1 except that is the opposite of the radial direction. That is, in the tire of Example 1, the ridge r extends to the right, rises to the left, and rises to the left in the three regions T1, T2, and T3. In the tire of Example 2, the three regions T1, T2, and T3 extend. The tire is the same as the tire of Example 1 except that all the ridges r extend upward.
[0014]
【The invention's effect】
Compared to conventional tires, the pneumatic tire of the present invention makes the unevenness generated in the tire sidewall inconspicuous, and the cutting edge of the bite gradually wears out when forming the recess in the mold, at the adjacent locations at the beginning and end of digging. There is an effect of suppressing the appearance defect of the resulting tire.
[Brief description of the drawings]
FIG. 1 is a partial front view of a tire decorative body according to an embodiment of the present invention.
FIG. 2 is a partial front view of a tire decorative body according to an embodiment of the present invention.
[Explanation of symbols]
r Ridge S Toroidal ornament M Radial inner edge N Radial outer edge d Ridge spacing d1 Ridge spacing d2 Ridge spacing d3 Ridge spacing T1 Inner region T2 Middle region T3 Outer region

Claims (6)

周方向に0.3 乃至 5mmの小さな間隔を置いて周上等間隔に設けられた、高さが0.3 乃至 2mmの多数の小さなリッジよりなる円環状の装飾体を少なくとも一方のサイドウオールの表面に備えた空気入りタイヤにおいて、
(1)前記円環状の装飾体は、ラジアル方向外側に位置する外側領域、中間領域およびラジアル方向内側に位置する内側領域よりなる少なくとも3ヶ所の領域で構成され、該中間領域のラジアル方向の幅が、該外側領域および該内側領域のラジアル方向の幅に比べて同等以下であり、該リッジが伸びる方向に直角方向のリッジ間隔が、それぞれの領域内では同一で、領域間ではラジアル方向外側に向けて不連続に段階的に増加または減少しているものであり、
(2)前記リッジは、該円環状の装飾体のラジアル方向内側端縁から外側端縁までの間で、連続して互いに平行に延びて、周方向に測定したリッジ間隔が同じになる、
ことを特徴とする空気入りタイヤ。
Provided on regular intervals circumferentially at a small distance from 0.3 to 5mm in the circumferential direction, the height is provided on the surface of at least one of the side wall an annular decorative body consisting of many small ridges of 0.3 to 2mm In pneumatic tires,
(1) The annular decorative body is composed of at least three regions including an outer region located outside in the radial direction, an intermediate region, and an inner region located inside in the radial direction, and the width of the intermediate region in the radial direction. Is equal to or less than the radial width of the outer region and the inner region, and the ridge spacing in the direction perpendicular to the direction in which the ridge extends is the same in each region, and radially outward between the regions. Which increases or decreases in a discrete and stepwise manner,
(2) The ridge extends continuously in parallel from the radial inner edge to the outer edge of the annular decorative body, and the ridge interval measured in the circumferential direction is the same .
A pneumatic tire characterized by that.
該リッジは、直線状または曲線状に延びているものである、請求項1記載の空気入りタイヤ。  The pneumatic tire according to claim 1, wherein the ridge extends linearly or curvedly. 該リッジが延びる方向に直角方向のリッジ間隔が、該円環状装飾体のラジアル方向外側端縁で0.8乃至5mm、ラジアル方向内側端縁で0.6乃至2mmである、請求項1または2記載の空気入りタイヤ。  The pneumatic ridge according to claim 1 or 2, wherein a ridge interval in a direction perpendicular to a direction in which the ridge extends is 0.8 to 5 mm at a radial outer edge and 0.6 to 2 mm at a radial inner edge of the annular decorative body. tire. 該リッジが延びる方向に直角方向のリッジ間隔が、該円環状装飾体のラジアル方向内側端縁で0.8乃至5mm、ラジアル方向外側端縁で0.6乃至2mmである、請求項1または2記載の空気入りタイヤ。  The pneumatic ridge according to claim 1 or 2, wherein a ridge interval in a direction perpendicular to a direction in which the ridge extends is 0.8 to 5 mm at a radial inner edge and 0.6 to 2 mm at a radial outer edge of the annular decorative body. tire. 該3ヶ所の領域は、ラジアル方向の幅がそれぞれ周上同一で、同心円状の円環体を形成したものである、請求項1〜4の何れかに記載の空気入りタイヤ。  The pneumatic tire according to any one of claims 1 to 4, wherein the three regions each have a radial width that is the same in the circumference and forms a concentric ring. 該3ケ所の領域は、該円環状装飾体のラジアル方向の幅に対して3乃至20%の小さな幅と、該円環状装飾体のラジアル方向の幅に対して40乃至90%の大きな幅の領域とによって形成されるものである、請求項1〜4の何れかに記載の空気入りタイヤ。  The three regions have a small width of 3 to 20% with respect to the radial width of the annular ornament and a large width of 40 to 90% with respect to the radial width of the annular ornament. The pneumatic tire according to any one of claims 1 to 4, wherein the pneumatic tire is formed by a region.
JP00600398A 1998-01-14 1998-01-14 Pneumatic tire with an annular decorative body consisting of many ridges Expired - Fee Related JP3946850B2 (en)

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