JPH035203A - Device for attaching wheel cover - Google Patents

Abstract

PURPOSE:To easily release a molded product from a mold by engaging the interior piece of a slide mold into the head of a clad piece and drawing the molded product from the mold while the clad piece is raised by the interior piece when a groove for engaging a spring of the clad piece disposed on the outer periphery of a wheel cover disk. CONSTITUTION:While front and rear molds 7 and 8 and a slide mold 9 are closed, a clad piece 1 disposed on the outer periphery of a wheel cover disk is formed. When the slide mold 9 is operated by a prescribed stroke S and stops, a clad piece 1' is bent. At this time, the clad piece 1' is raised by the interior piece 92 of the slide mold 9. Further, the clad piece 1' is removed from the protrusion 82 of the rear mold 8 for forming a groove for a spring of the clad piece 1. After the rear mold 8 is moved upward and the protrusion 82 passes, the clad piece 1' is removed from the slide mold 9 and returned to an original position. Thus, the interference between the groove for engaging the spring of the clad piece 1 and the protrusion 82 of the rear mold 8 is eliminated to easily perform releasing of the mold.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a plastic wheel cover mounting device, and relates to a molding technique thereof and a structure of the wheel cover that enables effective mounting.

[Prior art] A type of mounting device in which a mounting piece is erected on the circumference of a plastic wheel cover board toward the inner surface of the rim, and a closed annular spring is secured to the back side of the mounting piece with elastic force to fit it onto the rim. has become the mainstream technology due to its simplicity and high performance.

The origin of this style originated from Utility Model Publication No. 41-7052 ('68), and passed through U.S. Pat. , which was used in the same country's BMW car (°84 model year). This is shown in FIGS. 2 to 5.

Figure 342 and Figure 3 show the main parts of the mounting device, Figure 2 is a perspective view from the outside and Figure 3 is a perspective view from the inside, Figure 4 shows how to cut it out, and Figure 5 shows the wheel. FIG. 5 is a sectional view showing a state in which the cover is attached inside the rim 5. FIG. The crimp piece 1 has a structure in which a crimp head 11 is supported by a strut 12, and stands up from an annular rib 41 surrounding the wheel cover board 4. The compression piece 1 is backed by an annular spring 3 and extends radially, mainly through its support 12.
When the part is bent, it is expanded. At this time, crimping piece 1
In addition to requiring a groove 10 for hooking the spring 3, a limiting piece 2 is provided upright to limit expansion to the fourth power. The restricting piece 2 also has the function of restricting the spread of vibrations that occur after the wheel cover is attached, and thus restricting the stress that occurs mainly in the support column 12 of the crimp piece 1.

The subject matter of the present invention is the means for forming the spring catch groove 10 and the structure of the resulting product. In this example and its successors, a slide mold is pushed through the crimp piece to form an amplifier cut 1-socket groove 10, which is called a molding term.

Above the crimp piece 1 there is a hooking piece 13.13 for the annular spring 3 shown in FIG. 5 (see FIG. 2), through which a hole 14.14 passes downwardly from the outside. As shown in FIG.
The plan is to make the groove protrude until it reaches the back surface of the groove 10, thereby forming the groove 10.

The main body is divided into male and female parts by the front mold 7 and the back mold 8, but the hanging pillar 81 for creating the space 5920 between the limiting piece 2 and the support 12 is separated from the crimp piece 1 from the back mold. It penetrates.

FIG. 5 is a sectional view when the wheel cover is installed. During the installation operation up to this point, the crimp piece 1 is expanded by the elastic pressure of the annular spring 3 hooked to the groove 10, but when the gap 20 disappears. It stops against the restriction piece 2, and the head of the crimp piece 1 is easily introduced into the flange base R53 of the rim 5.

Next, the pressure guard 11 climbs over the seat back 52 and hits the hump 5.
1 to complete the installation. Due to the vibrations applied to the wheel cover as the car runs, repetitive stress is constantly generated on the struts 12 of the crimp piece 1, and there is a concern about fatigue.
4 is provided with an outer gap 21 which limits the imaging width and thus limits the maximum value of the stress.

This effect also effectively limits movement of the wheel cover due to eccentric center of gravity during high-speed driving.

The form of the technical idea detailed above demonstrated outstanding performance, and its die-cutting method in particular gave birth to many similar ideas. For example, there are U.S. Pat. Also, expansion restriction・A
) The idea of a dragon prevention restriction piece also inspired many similar ideas.

For example, Utility Model Application No. 60-105203, Utility Model Application No. 61-10
No. 7601, Utility Model No. 61-35002, Utility Model No. 62-
No. 150201, Japanese Utility Model Application No. 63-137001, and Japanese Utility Model Application No. 63-155805.

[Problem to be solved by the invention]

However, the die-cutting method of pushing the crimp piece through in the previous example and the piercing die-cutting method of the inherited design complicate the mold and impose a large burden on the company. It has the problem of being limited to inferior shapes, and this drawback has not been solved not only in the original text but also in all of the above-mentioned designs.

(Means for Solving the Problems) In other words, the concept of the previous example is based on the flexibility of the crimp piece. Therefore, since this available ta +'t can be utilized even during die cutting, the gist of the present invention is to provide a method for solving the above-mentioned problems from this viewpoint. Furthermore, since the crimping piece and the wheel cover plate are supposed to be integrally molded, the plate surface also has flexibility, and the limiting piece does not necessarily function effectively (in the original, limiting piece 2 is crimped). It functions because it is held between the piece 1 and the rim 5), but the present invention also takes this point into consideration.

〔Example〕

The present invention will be explained in detail below based on embodiments shown in the drawings.

FIG. 1 is a perspective view of the rear surface of the main part of the present invention, viewed from the center direction of the wheel cover board 4 toward the outer periphery 41. As shown in FIG. Crimp pieces 1.1...1 are placed along the concentric circle 40 near the outer periphery 41.
has been erected. The crimp piece 1 (each solid) has a structure in which the head 11 is supported by a support 12, and the support 12 has a double bend 12.
There is a groove 10 inside the head 11 having a diameter of 1,122, and a crimp head 111, a top 112, a thinning 114 if necessary, and a sloped or conical surface 113. The top portion 112 is set to be smaller than the inner part of the crimping type 111 or the groove 10 depending on the draft angle of the mold. All crimp pieces 1.1
. . . The ring spring 3 is fitted across the inner part of the groove 10 of No. 1, expands due to its own elasticity, and urges and presses the crimp piece 1 in the radial direction.

Next, the procedure for removing the molded product (wheel cover) from the mold will be explained.

As can be easily understood from Fig. 6, the crimping piece 1 was molded with the female and male molds 7.8 and the slide mold 9 closed, and the slide mold 9 moved by an appropriate stroke S and then stopped. It is deflected by 1 degree at a time. This is because the slope 113 (or conical surface) formed on the back piece 92 of the slide mold 9 is undercut with respect to the mold sliding direction, so that the crimp piece 1 is pulled up. At this time, the protrusion 82 or 83 in which the groove 1° or the thickness cutout 114 was formed has been removed by the bending of the crimp piece 1°, and by operating the protruding pin, the back form 8 is moved relatively upward. Even when the groove is moved, undercutting of the groove 10 is avoided. As the stroke of the ejecting pin increases, the slope 113 will come off the slide mold, so the crimp piece l° will try to return to its original position 1, but since the ejecting stroke has already increased, the groove will not affect the mold removal.
Although the upper surface of the groove 10 has a strong undercut angle, it can be freely changed by selecting the inside angle α of the crimp piece and the slide angle β. Further, since the slope 113 rotates as shown in the figure, it can also be formed into a conical surface if the material has a low compression resistance. At the same time, double bending 121.1
22 increases the degree of freedom in the rotation.

That is, the head 11 of the crimp piece 1 is pulled up in an arc centered around the center 01. In contrast, the slide mold 9 moves linearly. Therefore, if there is no cushioning property in the vertical direction in the figure, the head 11 of the crimp piece 1 will be bitten while being rotated by the slide die. However, due to the presence of the double bends 121 and 122, the gap g□ is allowed to occur when the crimp piece 1 is pulled up, so that the above-mentioned jamming is greatly alleviated. Further, as shown in Fig. 8, the conical surface 1
By using 13 degrees, even if the material has low resistance to compressive fracture, it can be rotated and the damage can be alleviated.

Next, the effect will be explained.

FIG. 7 shows the state in which the wheel cover is attached to the rim 5, and shows the groove 1 provided on the back surface, that is, inside, of the head 11 of the crimp piece 1.
The ring spring 3 is delivered to the rim 5, and is attached by crimping and lining the crimping type 111 fitted into the hump 51 of the rim 5. At this time, the double bends 121 and 122 provided on the support column 12
gives a slight amount of cushioning in the vertical direction as shown in the figure, so even if the outer periphery 41 of the wheel cover plate 4 is in contact with the rim flange end 54, the wheel cover will not be knocked out during shooting or impact. There is no problem with installation, so the dimensional accuracy is poor, and since a wheel balancer is also attached here, normally a large gap is required, and the appearance is not good and there are dust and sand intrusion. Problems such as these are also left behind, but this invention has also improved this point.

Eccentric movement with respect to the disk wheel due to vibration or eccentric center of gravity of the wheel cover is limited by the amount of eccentricity due to the close contact of the gap g2. Therefore, the magnitude of the stress generated in the strut 12 portion of the crimp piece 1 is limited, and the double bend 121, 122
The presence of the wheel cover further reduces the stress and also absorbs the impact force in the wheel cover removal direction caused by the contact of the 82 parts. Therefore, the attachment force, in other words, the resistance to falling off is extremely good.

When attaching the wheel cover, the top part 112 of the crimp head 11 first hits the flange base R53 of the rim 5, and the crimp piece 1 falls inward against the spring force and is smoothly introduced into the rim.

Next, it climbs over the seat back 52 and fits into the hump 51, but the double bending during this process requires operations such as tapping for installation. However, this does not impair the operational feel.

The removal operation is performed by holding the outer periphery 41 of the wheel cover or an air hole (not shown) and pulling it out, in the opposite manner to the above. At this time, the ring spring 3 is placed under conditions where it is most likely to become unlatched, but the groove 10 of the present invention has an angle in the biting direction above and its upper wall (inside 113) is different from the conventional example. Since it has a solid structure rather than the weak type of support beams that you see, there is no chance of the ring spring coming off and it is highly reliable.

(Effects of the Invention) As described above, in the present invention, a plurality of crimped pieces are erected at intervals along the near outer circumference on the back surface of a wheel cover board, and between these crimped pieces there is a A hole cover mounting device in which an annular spring that presses in a radial direction toward the rim is suspended and a crimping piece is attached by pressing against a hang of the rim, and the crimping piece has a groove on the inside for hooking the annular spring. When forming the groove, a wheel cover mounting device in which a back piece interlocked with the slide die is inserted into both sides of the head of the crimp piece, and the die is removed while pulling up the crimp piece with the back piece. Groove 10 with a strong undercut angle
can be removed from the mold, and the strength of the retaining piece (113 parts) is sufficient, so that the ring spring 3 can be fully retained. Moreover, the mold structure is the same as the conventional example, so there is no economic burden. The double bend provided on the strut 12 of the crimp piece 1 provides 0 clearance g for good installation compatibility and high vibration resistance.
The cover disk amplitude is regulated by the over-oscillation width limit of only 2, and the presence of double bending provides the effect of being highly resistant to falling off and significantly reducing stress.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the main parts of the present invention, Figs. 2 to 5 are explanatory diagrams of the prior art, Figs. FIG. 3 is a perspective view of main parts showing another embodiment of the invention. 1... Crimping piece 2... Limiting piece 3... Ring spring 4... Wheel cover board 5... Rim g... Gap 7... Front mold 8... Back mold 9...・Slide type 0...Center Figure 1 and 4 others Figure 5 Figure

Claims (1)

[Claims] 1. A plurality of crimping pieces are installed at intervals along the near outer circumference on the back surface of the wheel cover board, and an annular spring that presses radially from the inside to the outside is suspended between these crimping pieces. In this hole cover mounting device, the crimp piece has a groove on the inner side for hooking the annular spring, and when forming the groove, a back piece that interlocks with the slide mold is attached. A wheel cover mounting device characterized in that the crimp piece is inserted into both sides of the head of the crimp piece, and the crimp piece is pulled up using the back piece to be removed from the mold.