JP2007099240A - Through plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a through plate in which a stainless steel surface is finished to a glossy surface close to a mirror surface without providing any plating layer on the surface. <P>SOLUTION: In the metallic through plate 43 for a through anchor, extremely small projecting parts 27 for reducing a contact area with a waving belt 3 are provided on a contact surface with the waving belt 3. Tops of the extremely small projecting parts 27 form the surface of a through plate base material itself. The surface of the extremely small projecting parts 27 is polished to a smooth surface having surface roughness finer than that when the extremely small projecting parts are formed, and the material of the through plate 43 is stainless steel. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a through plate used for a through anchor for hanging a waving belt in a seat belt device, and more specifically, the top of a minute projection provided on a contact surface between the waving belt and the through plate, The present invention relates to a through plate that is easily slipped and polished without performing surface treatment such as plating.

  Conventionally, a vehicle is provided with a seat belt device in order to safely protect a vehicle occupant. As schematically shown in FIG. 2, the seat belt device includes a waving belt 3 that restrains an occupant seated in the seat 1. One end of the webbing belt 3 is wound around a retractor (winding device) built in the center pillar 5, and the other end is locked to an anchor plate 7 attached to the lower part of the center pillar 5. .

  An intermediate portion of the waving belt 3 is folded downward through a belt insertion hole of a through anchor 11 attached to the upper portion of the center pillar 5 via an anchor bolt 9 from below. A sluting 13 is attached to an appropriate position on the lower side of the waving belt 3. This thruching 13 is provided so as to be connected to and detached from a buckle 17 attached to the floor portion via an anchor 15. Since this type of seat belt apparatus is known, a more detailed description of the seat belt apparatus is omitted.

  As the structure of the through anchor 11, a structure as shown in FIGS. 3A and 3B is known (see Patent Document 1).

The through anchor 11 includes a metal through anchor plate 21 having a hole 19 through which the anchor bolt 9 is inserted and an insertion hole 23 through which the waving belt 3 is inserted. The periphery of the insertion hole 23 of the through anchor plate 21 is covered with resin by insert molding. In the covering member 25 covering the portion of the insertion hole 23, the contact surface with the portion where the webbing belt (not shown in FIG. 3) inserted through the insertion hole 23 is folded back has a small contact area with the webbing belt. In order to make the sliding smooth, a minute convex portion 27 having an appropriate shape such as a stripe shape or a dome shape is formed.
Japanese Patent No. 3257589

  In the configuration as described above, since the contact portion with the waving belt is resin, in order to improve the problem of static electricity and the slipperiness, the waving of the insertion hole 23 in the through anchor 11 as shown in FIG. A through anchor having a structure in which a through plate 29 made of a thin metal plate is attached to a portion in contact with the belt has been developed. In the through plate 29, similarly to the minute protrusions 27, minute protrusions 31 (see FIG. 5) having an appropriate shape are formed.

  The processing of the minute protrusion 31 is performed by pressing. That is, as schematically shown in an enlarged view in FIG. 5, the through plate 29 is interposed between the punch P and the die D, and the embossing is performed by engaging the punch P and the die D. The minute convex portion 31 is molded. At this time, since the top portion 31T of the minute convex portion 31 is stretched by projecting and deforming the minute convex portion 31, the surface roughness is worse than the material surface before processing, and the slip resistance is increased. The chrome plating is applied to improve the slipperiness. However, there is a problem that the surface roughness during embossing remains as it is even after chrome plating or the like.

  Further, as shown in FIG. 6, when the through plate 29 is attached to the belt folding portion (belt contact portion) 33 of the through anchor 11, the curl 35 is formed on both end edges of the through plate 29, and the belt folding portion is formed. It is curved and deformed along the small-diameter curved portions 37 on both side edges of 33. Therefore, if the thickness of the chrome plating is not properly managed, the plating layer may be broken or peeled off from the broken portion, resulting in a defective product.

  Further, when used for a long time, the plating layer may be peeled off due to the friction between the waving belt and the minute convex portions 31 of the through plate 29, and the slipperiness may be lowered. When the plating layer is peeled off as described above, the coating of the coating material such as a brazing material coated on the surface of the belt is peeled off to increase the slip resistance of the webbing belt, and the slip resistance increases. This may increase the feeling of pressure when the webbing belt is pulled out, and may deteriorate the winding property when the belt is stored.

  Furthermore, the through plate is a belt-shaped metal plate that is sequentially processed by a press and cut and separated from the metal plate in the final process. When the through plate is assembled, as shown in FIG. 7, there is a risk that the edge 39 and burrs bite into the resin part and the resin crack 41 is generated. Furthermore, it is expensive to perform chrome plating, and there is a problem in using it as it is for material recycling at the time of disposal.

  The present invention has been made in view of the conventional problems as described above, and is a metallic through plate for a through anchor for reducing the contact area with the waving belt on the contact surface with the waving belt. In order to reduce the friction between the surface of the minute projection and the waving belt, and the top of the minute projection is the surface of the through-plate base material itself without a plating layer. In addition, the surface is polished to a smoother surface than the surface roughness when the minute convex portions are formed.

  In the through plate, the material of the through plate is stainless steel.

  According to the present invention, the minute convex portion where the through plate comes into contact with the waving belt is obtained by polishing the base material surface of the through plate as it is to smoothly finish the surface, so that the friction between the waving belt and the through plate is reduced. The webbing belt can be smoothly wound and pulled out from the retractor, and there is no problem due to the presence of the plating layer, and it can be used as it is for material recycling during disposal. That is, the conventional problems as described above can be solved.

  Hereinafter, a through plate according to an embodiment of the present invention will be described with reference to the drawings. Components having the same functions as those of the conventional configuration described above are denoted by the same reference numerals, and redundant description is omitted.

  Referring to FIG. 1, a through plate 43 according to an embodiment of the present invention is a quadrangular stainless steel plate having a thickness of about 0.3 mm, and is curved in a substantially U shape. And in the state attached to the through anchor 11, the small convex part 31 of an appropriate shape is formed in the part which contacts the waving belt 3 in order to reduce the contact area with the waving belt 3 similarly to the conventional through plate. It is formed.

  The through plate 43 is manufactured, for example, by continuously processing a stainless strip material with a press. Therefore, when the minute convex portion 31 is formed by protruding by embossing, as described above, the surface of the minute convex portion 31 is extended and becomes rougher than the surface of the base material (material). That is, the surface of the through plate 43 is silver-white and has no gloss, and there is no “smooth” feeling that slips smoothly when touched by hand, and it can be realized that the friction coefficient is large. Therefore, when it is attached to the through anchor 11 in this state, the friction with the waving belt 3 becomes large, and the aesthetic feeling is impaired, which is not practical.

  Therefore, conventionally, in order to improve decoration, wear resistance, and slipperiness, as described above, chrome plating or the like is applied to give a glossy and “smooth” surface. However, if chrome plating is applied to the through plate, it becomes expensive and there is a problem in recycling when it is discarded.

  Therefore, in this embodiment, in order to improve the decorativeness and slipperiness almost the same as when chrome plating is applied, the surface of the through plate 43 after embossing is polished to give a mirror surface. It is processed into a surface having a gloss close to. As the surface polishing, normal electrolytic polishing and chemical polishing as the main surface finish of stainless steel can be performed. According to the above-mentioned electrolytic polishing and chemical polishing, it is possible to finish the glossy surface with the “smooth” feeling. Further, as the surface polishing of the through plate 43 that has been embossed, barrel polishing, buff polishing, or the like can also be employed.

  However, barrel polishing is desirable for processing the surface of the through plate 43 after the press processing into a surface having a gloss close to a mirror surface. As a method of barrel polishing, there are a fluid type, a pressure flow type, a centrifugal type, a vibration type, and a rotary type. As a barrel polishing process of the through plate, a vibration barrel polishing process is desirable. In other words, considering the size of the through plate as a workpiece, and considering that the polishing force when polishing the surface of the through plate to a surface close to a mirror surface is not necessary, high barrel polishing is necessary. Is desirable.

  As for the relationship between the amount of the through plate and the medium as the workpiece when performing vibration barrel polishing, it is desirable to increase the amount of the medium as compared to the through plate in order to prevent the occurrence of scratches due to collision between the workpieces. And as a medium, steel of spherical shape, an egg shape, a conical shape, etc. is used, and the size of the concave portion between the minute convex portions 31 does not necessarily need to be polished. It is desirable that the dimensions be larger than the pitch. Note that the vibration frequency, processing time, and other processing conditions in the vibration barrel polishing process may be the same as the general vibration barrel polishing process conditions.

  As described above, when the barrel polishing of the through plate 43, which is curved in a U-shape in advance and has a large number of minute protrusions 31 formed in a portion in contact with the waving belt 3, under appropriate conditions, the top of the minute protrusions 31 A nearby surface is barrel-polished to a surface close to a mirror surface, that is, a glossy surface, and the other surfaces of the through plate 43 are similarly barrel-polished. And while removing the small burr | flash which generate | occur | produced in the outer periphery part of the through plate 43 at the time of a press process, an outer periphery part is rounded to the circular shape of a minute diameter, and a sharp edge is eliminated.

  Therefore, the surface roughness in the vicinity of the top of the minute convex portion 31 is improved, and the contact slip property with the waving belt 3 is improved. That is, the frictional resistance between the minute convex portion 31 and the waving belt 3 decreases. Further, as in the prior art, when the curl 35 is formed at both end portions of the through plate 43 and is bent and deformed along the small-diameter curved portion 37 of the folded portion 33 in the through anchor 11 and assembled to the belt folded portion 33, The edge does not act on the resin to generate minute cracks. Further, since there is no plating layer such as chrome plating and the raw material (base material) is left as it is, when the curl 35 is formed or curved along the small-diameter curved portion 37, the coating such as the plating layer is peeled off. There are no problems.

  Furthermore, since the surface of the through plate 43 is processed into a glossy surface close to a mirror surface with the surface of the base material (material) having no plating layer by barrel polishing, the surface is subjected to chrome plating. In addition to being inexpensive, it can be used as it is for recycling because it has no coating such as plating.

  As can be understood from the above description, the through plate is processed into a glossy surface close to a mirror surface by appropriate polishing without performing chrome plating or the like. Material) itself.

It is explanatory drawing of the through plate which concerns on embodiment of this invention. It is explanatory drawing of a seatbelt apparatus. It is explanatory drawing of a through anchor. It is explanatory drawing of a through anchor. It is explanatory drawing in the case of forming a micro convex part. It is explanatory drawing which shows the attachment state of the through plate with respect to a through anchor. It is explanatory drawing in case a damage | wound generate | occur | produces at the time of the assembly | attachment of a through plate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Wavebing belt 7 Anchor plate 11 Through anchor 13 Thruing 15 Anchor 17 Buckle 21 Through anchor plate 23 Insertion hole 25 Cover member 27 Minute convex part 29,43 Through plate 31 Minute convex part 33 Belt folding | returning part (belt contact part)
37 Small-diameter curved part

Claims (2)

  A metal through plate for a through anchor, comprising a minute convex portion for reducing a contact area with the waving belt on a contact surface with the waving belt, and a top portion of the minute convex portion is a through plate base material In order to reduce the friction with the webbing belt, the surface of the surface of the microprojection is polished to a surface smoother than the surface roughness when the microprojection is formed. Through plate characterized by   The through plate according to claim 1, wherein the through plate is made of stainless steel.

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