JPH09242732A - Cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the falling-off of a cover even if an impact is applied from the outside by providing a projecting supporting part in the inner surface of a peripheral wall for supporting the peripheral wall when the cover comes into contact with an article to be covered at the time of its pressing-in and the peripheral wall inclines to the inside after its pressing-in. SOLUTION: Inside the bent part 2c of the inner surface of a peripheral wall 2, there are provided a plurality of integrally formed projecting supporting parts 5 for supporting the peripheral wall 2 when a cover comes into contact from above with the upper surface of the outer peripheral edge part of a bush 23 at the time of its pressing-in and the peripheral wall 2 inclines toe the inside in a part of a circumference after its pressing-in. When an impact is given to a cover 1 by being horizontally hit, although the peripheral wall 1 inclines to the inside in a part of a circumference, the supporting parts 5 support the peripheral wall 1 from the inside while being seated in the upper surface 23a of the outer peripheral edge of the bush 23 and thus the inclination of the cover 1 caused by the falling of the peripheral wall 2 is prevented. Thus, the inclining deformation of the cover 1 caused by an impact, removal of an under cut part 4 from the outer peripheral edge of the bush 23 and falling-off of the cover 1 are prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover, and more particularly to a cover suitable for being used as a dust cover for covering bolt fastening portions and the like.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG.
And a top wall 53 is integrally provided to present a cap shape as a whole, and an undercut portion 54 for retaining is provided on the inner surface of the distal end portion of the peripheral wall 52, and the cover object 21 is press-fitted from above so as to be attached. A resin cover 51 is known. Specifically, the illustrated covering object 21 is a fastening portion of a bolt, and includes a base 22, a bush 23, and a flat washer 2.
4, the spring washer 25, the nut 26 and the bolt 27 are fastened with a known structure as shown in the drawing. The cover 51 is press-fitted from above as a dust cover for covering the bolt fastening portion, and the undercut portion 54 of the bush 23. It is elastically engaged with the outer peripheral edge portion and is prevented from coming off.

However, the cover 51 has the following problems. That is, when there is a step of hitting the vicinity of the cover 51 with a hammer after mounting the cover 51,
If the cover 51 is hit by a side hit by mistake, as shown in FIG. 7, the cover 51 may be deformed so as to be tilted by the impact F. When the cover 51 is deformed in this way, the undercut portion 54 is removed from the bush 23. Off the perimeter,
The cover 51 may fall off.

[0004]

SUMMARY OF THE INVENTION In view of the above points, an object of the present invention is to provide a cover having a structure in which the cover is unlikely to be deformed so as to be tilted even when an impact is applied from the outside, and thus is hard to drop off.

[0005]

In order to achieve the above object, a cover according to claim 1 of the present invention has an undercut portion for preventing the inner wall of a peripheral wall from being pulled out, and is press-fitted and mounted so as to cover an object to be coated. In the cover, the inner surface of the peripheral wall is provided with a convex support portion that is abutted against the object to be coated at the time of press fitting, and supports the peripheral wall when the peripheral wall tries to fall inward after the press fitting. The cover according to claim 2 of the present invention is a cover equipped with an undercut portion for preventing the inner wall of the peripheral wall from slipping off, and is press-fitted to cover an object to be coated. When the peripheral wall is inserted into the outer peripheral side of the object and the peripheral wall tries to fall inward after being press-fitted, a convex supporting portion that comes into contact with the outer peripheral surface of the object to be covered and supports the peripheral wall is provided. Further, in the cover according to claim 3 of the present invention, the support part described in claim 1 and the support part described in claim 2 are integrally formed as one rib.

[0006]

In the cover according to claim 1 of the present invention having the above-mentioned structure, when the cover is hit by a lateral hit and an impact is applied to the cover as described above, the peripheral wall is partially inward on the circumference. In contrast to the tendency to fall, the convex support portion provided on the inner surface of the peripheral wall supports the peripheral wall from the inside, so it is possible to prevent the peripheral wall from falling and deforming so that the cover is inclined. . The convex support portion is pressed against the object to be coated in the press-fitting direction at the time of press-fitting, and thus supports the shock while seated on the object to be coated after press-fitting. Further, in the cover according to claim 2 of the present invention having the above-mentioned configuration, when the cover is hit by a lateral hit and an impact is applied to the cover as described above, the peripheral wall falls inward at a part of the circumference. While trying to
Since the convex support portion provided on the inner surface of the peripheral wall supports the peripheral wall from the inside, it is possible to prevent the peripheral wall from falling and deforming so that the cover is inclined. The convex support portion is inserted into the outer peripheral side of the covering object at the time of press-fitting, and therefore, after the press-fitting, when the peripheral wall tries to fall inward, it abuts on the outer peripheral surface of the covering object, and the peripheral wall and the covering object. The shock is supported while being interposed between the outer peripheral surface and the outer peripheral surface.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A supporting portion according to claim 1,
Each of the support portions described in claim 2 is arranged in a circle so that the peripheral wall can be supported regardless of the direction of the impact of the lateral hit. Further, this supporting portion may be provided as an annular convex portion on the entire line on the circumference. Further, when a plurality of them are arranged on the circumference, the support part described in claim 1 and the support part described in claim 2 respectively,
It is preferable that the ribs are formed in a rib shape, and as described in claim 3, it is preferable that both supporting portions are integrally formed as one rib.

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings.

First Embodiment FIG. 1 shows a state in which the cover 1 according to the first embodiment is press-fitted so as to cover the object to be coated 21. Similar to the above-mentioned conventional example, the specific example of the covering object 21 is a fastening portion of the bolt, and includes the base 22, the bush 23, and the flat washer 2.
4, the spring washer 25, the nut 26 and the bolt 27 are fastened with a known structure as shown in the drawing, and the cover 1 is press-fitted from above as a dust cover for covering the bolt fastening portion.

The cover 1 is made of synthetic resin and integrally formed with a peripheral wall 2 and a ceiling wall 3 and is molded in a cap shape as a whole. The peripheral wall 2 has a straight portion 2a on the front end side (the lower end side in the figure). And a tapered portion 2b on the rear end side (upper end side in the figure) and a bent portion 2c between the two 2a, 2b are integrally provided. Further, an undercut portion 4 for retaining is integrally provided on the inner surface of the tip portion of the straight portion 2a, and the undercut portion 4 elastically engages with the outer peripheral edge portion of the bush 23 so that the cover 1 is bolted. It is secured to the fastening part. The undercut portion 4 is a protrusion that is provided so as to project inwardly on the inner surface of the tip portion of the straight portion 2a, and a plurality of the undercut portions 4 are arranged on the circumference (for example, equally spaced).

The inner surface of the peripheral wall 2 and the inside of the bent portion 2c are abutted against the upper surface 23a of the outer peripheral edge portion of the bush 23 from above during press-fitting, and after press-fitting, the peripheral wall 2 is inward at a part of its circumference. A convex support portion 5 is integrally provided to support the falling when trying to fall. The support portion 5 is a rib that is provided on the inner surface of the peripheral wall 2 so as to project inward so as to extend from the tapered portion 2b to the straight portion 2a. As shown in FIG. 2, a plurality of ribs are arranged on the circumference. However, as shown in FIG. 3 as a second embodiment of the present invention, it is provided as an annular convex portion or a thick portion over the entire line on the circumference. It may be.

In the cover 1 having the above-described structure, the cover 1 is hit by the side strike as described above and the cover 1 is hit.
When a shock is applied to the peripheral wall 2, the peripheral wall 2 tends to fall inward on a part of the circumference, whereas the convex support portion 5 integrally provided on the inner surface of the peripheral wall 2 is provided outside the bush 23. Since the peripheral wall 2 is supported from the inside while being seated on the upper surface 23a of the peripheral edge portion, it is possible to prevent the peripheral wall 2 from falling and deforming so that the cover 1 is inclined. Therefore, it is possible to effectively prevent the cover 1 from coming off due to the undercut portion 4 coming off from the outer peripheral edge portion of the bush 23 due to the deformation of the cover 1 so as to be tilted by the impact.

Further, since the convex supporting portion 5 integrally provided on the inner surface of the peripheral wall 2 is abutted against the upper surface 23a of the outer peripheral edge portion of the bush 23 from above during press fitting, the press fitting amount of the cover 1 is increased. It acts as a limiting stopper.
After the press-fitting, the undercut portion 4 and the convex support portion 5 provided on the inner surface of the peripheral wall 2 sandwich the outer peripheral edge portion of the bush 23 from above and below, so that the cover 1 is vertically slid. It is possible to effectively prevent sticking.

Third Embodiment FIG. 4 shows a state in which the cover 1 according to the third embodiment is press-fitted so as to cover the object to be coated 21. A specific example of the object to be coated 21 is a fastening portion of a bolt, and the base 22 and the bush 2 are similar to the above-mentioned conventional example and the first example.
3, the flat washer 24, the spring washer 25, the nut 26 and the bolt 27 are fastened with a known structure as shown in the drawing, and the cover 1 is press-fitted from above as a dust cover for covering the bolt fastening portion.

The cover 1 is made of synthetic resin and integrally formed with a peripheral wall 2 and a ceiling wall 3 and is molded in a cap shape as a whole. The peripheral wall 2 has a straight portion 2a on the front end side (lower end side in the figure). And a tapered portion 2b on the rear end side (upper end side in the figure) and a bent portion 2c between the two 2a, 2b are integrally provided. Further, an undercut portion 4 for retaining is integrally provided on the inner surface of the tip portion of the straight portion 2a, and the undercut portion 4 elastically engages with the outer peripheral edge portion of the bush 23 so that the cover 1 is bolted. It is secured to the fastening part. The undercut portion 4 is a protrusion that is provided so as to project inwardly on the inner surface of the tip portion of the straight portion 2a, and a plurality of the undercut portions 4 are arranged on the circumference (for example, equally spaced).

The inner surface of the peripheral wall 2 and the inside of the bent portion 2c are abutted against the upper surface 23a of the outer peripheral edge portion of the bush 23 from above during press-fitting, and after press-fitting, the peripheral wall 2 is directed inward at a part of its circumference. A convex first support portion 5 is integrally provided to support this when it is about to fall. The surrounding wall 2
The inner surface of the nut 26 is inserted into the outer peripheral side of the nut 26 at the time of press fitting, and when the peripheral wall 2 tries to fall inward at a part of the circumference after press fitting.
The second support portion 6 having a convex shape that abuts the outer peripheral surface 26a and supports the peripheral wall 2 is integrally provided. The first support portion 5 and the second support portion 6 are arranged in the vertical direction and integrally formed as one rib, and as shown in FIG.
The two ribs are provided in six equal distributions (a total of twelve) so that the second support portions 6 face each other at right angles on each of the flat surfaces of the outer peripheral surface 26a of the nut 26 having a planar hexagonal shape.

In the cover 1 having the above-mentioned structure, the cover 1 is hit by the side strike as described above and the cover 1 is hit.
When an impact is applied to the peripheral wall 2, the peripheral wall 2 tends to fall inward on a part of the circumference, whereas the convex first support portion 5 integrally provided on the inner surface of the peripheral wall 2 has a bush 23. Since the peripheral wall 2 is supported from the inside while being seated on the upper surface 23a of the outer peripheral edge portion, it is possible to prevent the peripheral wall 2 from falling and the cover 1 from being deformed so as to be inclined. At the same time, the convex second support portion 6 integrally provided on the inner surface of the peripheral wall 2 is in contact with the outer peripheral surface 26a of the nut 26 and is interposed between the peripheral wall 2 and the outer peripheral surface 26a of the nut 26. In order to support the peripheral wall 2 from the inside, it is possible to prevent the peripheral wall 2 from falling and deforming the cover 1 to incline. Therefore, it is possible to effectively prevent the cover 1 from coming off due to the undercut portion 4 coming off from the outer peripheral edge portion of the bush 23 due to the deformation of the cover 1 so as to be tilted by the impact.

Further, since the convex first support portion 5 integrally provided on the inner surface of the peripheral wall 2 is pressed against the upper surface 23a of the outer peripheral edge portion of the bush 23 from above when press-fitting,
It acts as a stopper that limits the amount of press-fitting of the cover 1. Also, after press fitting, the undercut portion 4 and the convex first support portion 5 provided on the inner surface of the peripheral wall 2 sandwich the outer peripheral edge portion of the bush 23 from above and below, so that the cover 1 moves in the vertical direction. It is possible to effectively prevent backlash.
In addition, since the first support portion 5 and the second support portion 6 are integrally formed as one rib, they have the effect of reinforcing each other, and more than when both 5 and 6 are formed separately. In addition, it has an effect of facilitating the molding such that the cavity shape of the mold becomes simple.

[0019]

The present invention has the following effects.

That is, first, in the cover according to claim 1 of the present invention having the above-mentioned structure, when the cover is hit by a lateral hit and an impact is applied to the cover, the peripheral wall is partially inward on the circumference. While trying to collapse,
Since the convex support portion integrally provided on the inner surface of the peripheral wall supports the peripheral wall from the inside in a state of being seated on the object to be covered, it is possible to prevent the peripheral wall from falling and deforming so that the cover is inclined. . Therefore, it is possible to effectively prevent the cover from coming off due to the undercut portion coming off due to the deformation of the cover so that it tilts due to an impact. Also, after press-fitting, the undercut portion provided on the inner surface of the peripheral wall and the convex support portion sandwich the outer peripheral edge portion of the object to be covered from above and below, so that the cover is prevented from rattling in the press-fitting direction. You can

Further, in the cover according to the second aspect of the present invention having the above-mentioned structure, when the cover is hit by a lateral hit and an impact is applied to the cover, the peripheral wall may fall inward at a part of the circumference. On the other hand, the convex support portion integrally provided on the inner surface of the peripheral wall abuts the outer peripheral surface of the covering object, and the peripheral wall is formed in a state of being interposed between the peripheral wall and the outer peripheral surface of the covering object. Since it is supported from the inside, it is possible to prevent the peripheral wall from falling down and the cover from being deformed like being tilted. Therefore, it is possible to effectively prevent the cover from coming off due to the undercut portion coming off from the outer peripheral edge portion of the bush due to the deformation of the cover so as to be inclined due to the impact.

In addition to this, in the cover according to claim 3 of the present invention having the above-mentioned structure, the support portion described in claim 1 and the support portion described in claim 2 are provided as one rib. Since they are integrally molded with each other, they have the effect of reinforcing each other, and the cavity shape of the mold is simpler than when they are molded separately.
This has the effect of facilitating molding.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a mounted state of a cover according to a first embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view of the cover according to the embodiment.

FIG. 3 is a partially cutaway perspective view of a cover according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a mounted state of a cover according to a third embodiment of the present invention.

FIG. 5 is a bottom view of the cover according to the embodiment.

FIG. 6 is a cross-sectional view showing a mounted state of a cover according to a conventional example.

FIG. 7 is a sectional view showing an inconvenience that occurs in the cover according to the conventional example.

[Explanation of symbols]

 1 Cover 2 Peripheral Wall 2a Straight Part 2b Tapered Part 2c Bent Part 3 Top Wall 4 Undercut Part 5, 6 Support Part 21 Covering Target 22 Base 23 Bushing 23a Upper Surface 24 Flat Washer 25 Spring Washer 26 Nut 26a Outer Surface 27 Bolt

Claims (3)

[Claims] 1. A cover (1) comprising an undercut portion (4) for preventing the inner wall of a peripheral wall (2) from being pulled out, the cover (1) being press-fitted to cover an object (21) to be coated, said peripheral wall (2). The inner surface of the object to be coated (2
A cover provided with a convex support portion (5) which is abutted against the peripheral wall (1) and supports the peripheral wall (2) when the peripheral wall (2) tries to fall inward after being press-fitted. 2. A cover (1) comprising an undercut portion (4) for preventing slip-out from the inner surface of a peripheral wall (2) and being press-fitted and mounted so as to cover an object (21) to be coated, said peripheral wall (2). The inner surface of the object to be coated (2
The peripheral wall (2) is inserted into the outer peripheral side of 1) and after press fitting
When the object tries to fall inward, the object to be coated (21)
A cover provided with a convex support portion (6) which comes into contact with the outer peripheral surface (26a) of the and supports the peripheral wall (2). 3. A support part (5) according to claim 1,
A cover, characterized in that the support (6) according to claim 2 and the support (6) are integrally formed as one rib.