JPH056410Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) This invention relates to a fastener.

(Prior art) When attaching decorative items such as various plates and sheets used in automobiles to body panels,
Resin fasteners have traditionally been used.

For example, fasteners T1 to T3 as shown in FIGS. 8 to 10 are known. Of these, the 10th
The installation work shown in the figure will be explained with reference to FIG.
Temporarily fit the fastener T3. Then, insert the through hole 23 of the decorative sheet 22 into the insertion hole 2 of the fastener T3.
4, and screw in the screw (tapping screw 25) from here. By doing this, the legs 26 of the fasteners T3 are bulged out, and the body panel 2
0 to the mounting hole 21.

(Problems to be Solved by the Invention) However, the conventional fasteners T1 to T3 described above have the following problems (see FIG. 11). Since the installation work of the decorative sheet 22 described above is done on the assembly line, the work is done in a hurry.
The through hole 23 of the sheet 22 and the insertion hole 24 of the fastener T3 may be forcibly screwed in while being in a misaligned state. In this case, the tightening will be incomplete. Further, even if the bolts are forcibly tightened, there is no place for the stress during tightening to escape, resulting in cracks in the leg portions 26 and the like. If this happens, the decorative sheet 22 will easily shift, and depending on the location where it is applied, water may leak due to cracks.

In addition, prior art of a fastening structure similar to this type of fastener is (a) a mechanism in which a hinge is fixed to a foam molded body with a soft foamed resin layer formed on the surface of a base made of hard urethane using a screw member. The foam is fastened by passing a screw member passed through the through hole of the hinge through an insert member seated on the hinge fixing surface and screwing into a fastening piece having a screw hole embedded in the base. A hinge fixing mechanism for the molded body (see Japanese Utility Model Application Publication No. 1983-19114), or (b) a set screw is screwed into a retainer fixed to a thin car body panel, so that internal and external parts can be attached via the set screw. A mounting structure for fixing the retainer to a vehicle body panel, in which a hard body that can be tapped is attached to the screw insertion part of the retainer, and a tapping pin screw that penetrates the interior and exterior parts is screwed into the hard body,
A mounting structure for interior and exterior vehicle components that secures interior and exterior components to a vehicle body panel (see Utility Model Application Publication No. 78753/1983) is known. However, with the hinge fixing mechanism described in (a) above, if the hinge is screwed with the through hole of the hinge misaligned with the screw hole of the foam molded product, the foam molded product may crack or cannot be installed, and the screw hole may not fit properly. On the other hand, there is a problem in that it is not possible to tolerate misalignment of screws.

The above-mentioned mounting structure (b) allows for easy mounting of screws (tatsu pin screws) to the hard body of the retainer, but
The rigid body to be screwed must be attached to a retainer, resulting in a complicated structure.

Therefore, the purpose of the present invention is to prevent the through-hole of the sheet and the position corresponding to the insertion hole of the stopper from being in a misaligned state.
It is an object of the present invention to provide a fastener that can secure a sufficient locking state even if the fastener is forcibly screwed in.

In addition, another purpose of the present invention is that the structure is simple;
To provide a fastener that can be inserted with good control into a mounting hole of a fixed body such as a body panel and has high strength.

(Means for Solving the Problems) In order to achieve the above object, the present invention comprises a base plate, a leg part, and a locking piece for preventing slippage, and the attached member is attached to a fixed body. A fastener of a type that can be fixed by pushing the leg together with the locking piece into a mounting hole drilled in the fixing body and screwing a fixing screw into the upper surface of the leg through the attached member. A predetermined range of the portion into which the screw is screwed is formed of a foamed resin layer, and an outer layer of the leg portion is formed of a hard layer.

(Function) Since the hard layer of the leg outer layer has appropriate rigidity, the leg can be inserted into the mounting hole with a sense of moderation. The hard layer protects the foamed resin layer and provides high strength to the fastener.

Even if the screwing position of the fixing screw deviates from the central axis of the fastener, as long as it is screwed into the foamed resin layer, cracking of the fastener can be avoided. This is because the foaming allows excess material during screwing to escape into the bubbles.

(Example) Hereinafter, an example embodying the present invention will be described in detail with reference to the drawings.

1 to 3 show a first embodiment of the present invention. As shown in FIG. 2, the fastener C2 in this example has a double structure, with a foam layer 9 on the inner layer.
It has a resin layer 10 in which no foaming agent is mixed in the outer layer. The resin layer 10 is exposed over an appropriate range on the upper surface of the fastener C2,
In order to facilitate the initial screwing of a screw, in this example, a tapping screw S, unevenness 6 is formed on the entire surface of the exposed portion to prevent slipping. Furthermore, a pair of locking pieces 11 are formed on the leg portion 4 so as to allow elastic deformation in the leg-closing direction and engageable with the mounting hole 1 of the body B.

That is, the stop C2 of the first embodiment is attached to the body B.
On the side, it has a rectangular base plate 2 formed larger than the rectangular mounting hole 1, and a leg part 4 is suspended from the lower surface of the base plate 2. The outer layer of the leg portion 4 is a resin layer 10 together with the outer peripheral portion of the substrate 2.
The concave portion of the resin layer 10 is filled with a foam layer 9 serving as an inner layer. In its natural state, the leg portion 4 is formed to be slightly smaller than the mounting hole 1, and its distal end is tapered for ease of insertion. Furthermore, a locking piece 11 for preventing slipping off is protruded from the lower end of the side surface of the leg portion 4. However, when the leg portion 4 is inserted, the locking piece 11 can pass through the attachment hole 1 because the locking piece 11 is elastically deformable as described below. Foam layer 9 of the above fastener C2
is formed by foam-molding a resin material to which a foaming agent has been added into the recessed portions of the resin layer 10. The resin materials for the foam layer 9 and the resin layer 10 include polyacetal,
So-called engineering plastics such as nylon and polypropylene were used. However, as the resin material for the foam layer 9, a foaming agent was added to the above-mentioned resin material.

It should be noted that since the amount of elastic deformation of the fastener changes depending on the degree of foaming, it is necessary to adjust the fastener so that a sufficient fastening force can be obtained to the body B.

Next, the present example fastener C2 formed as described above
The effects of this will be explained.

First, the fastener C2 is temporarily fitted into the mounting hole 1 of the body B. At this time, as described above, since the outer layer of the fastener C2 is made of the hard resin layer 10, the fastener C2 can be fitted smoothly and with good control. Then, when both the locking pieces 11 pass through the mounting holes, the fastener C2 is temporarily attached to the body B, and is temporarily prevented from coming off.

Thereafter, the decorative sheet 7 of the member to be attached is placed on the member, and the tapping screw S is pushed through the through hole 8 into the unevenness 6 of the fastener C2. If the screw is screwed in as it is, the leg portion 4 will swell slightly over a predetermined range, narrowing or closing the gap with the mounting hole 1, and as a result, the locking piece 11 will engage the edge of the mounting hole 1 of the body B. will be stopped. Thus, decorative sheet 7
is fixed to body B.

By the way, as shown in FIG. 3, the decorative sheet 7
When the decorative sheet 7 is placed over the body B, the center of the through hole 8 of the decorative sheet 7 may be misaligned with the central axis of the fastener C2. Conventionally, if the fastener C2 was screwed in as it is, cracks would occur in the fastener C2, but in this example, the foam layer 9 absorbs as much stress as possible during tightening, so the range of the foam layer 9 It is possible to avoid cracks occurring inside. Therefore, the seat 7 can be securely fixed even if it is not screwed into the proper position. In other words, the fastener C2 of this example is suitable for line work because it can absorb such operational errors well.

4 and 5 show a second embodiment of the present invention. In this example, a fastener C3 is composed of a foamed resin part 12 whose inner layer is entirely made of a foamed resin layer, and a metal outer layer, in this example, a plate clip part 13, which is tightly fitted to the foamed resin part 12. .
The plate clip portion 13 is allowed to be elastically deformed in the expansion direction. Further, locking pieces 15 for preventing the plate from coming off are formed by cutting and bending on both sides of the plate clip portion 13, and can be engaged with the mounting hole 1.

Note that this example is also similar to the above embodiment in that positional deviation can be absorbed.

6 and 7 show a third embodiment of the present invention. In this example C4, as in the first embodiment, the outer resin layer 14 is formed of a non-foaming resin material, and the inner foam layer 16 is formed with a foaming agent added to the concave portion of the resin layer 14. Although it is integrally foam-molded from a resin material, the insertion direction of body B with respect to the mounting hole 1 is different, and body B
It is of the type that is inserted from the bottom side. For this reason,
Locking pieces 15A for preventing the board from coming off are arranged on both sides of the board 2A. Further, a flange edge F is formed to protrude along the entire circumference on the leg portion 14 side.

In the third embodiment formed in this way,
If the fastener C4 is inserted from the underside of the body B, the locking piece 15A and the flange edge F can prevent the entire structure from shaking in the vertical direction. Note that the positional deviation can be absorbed in this example as well.

(Effect of the invention) As is clear from the above explanation, the fastener of the present invention can be screwed in even if the fastener is deviated from the central axis of the fastener. In this case, excess meat during screwing can escape into the air bubbles, so cracking of the fastener can be avoided. In addition, by foaming,
Since the screw tightening force can be lowered compared to the conventional screw tightening force, screwing work can be made easier and operator fatigue can be reduced. Furthermore, as an effect of foaming, the range in which screwing is allowed can be expanded. Therefore, when attempting to absorb deviations in the screwing position, there is no need to increase the size of the entire fastener, and an increase in weight and manufacturing costs can therefore be avoided.

Furthermore, since the fastener of the present invention has a hard outer layer on the leg, the structure is simple, the leg can be inserted into the mounting hole with a good sense of control, and the fastener has high strength.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, in which FIG. 1 is a perspective view showing the fastener and the mounting hole of the body, FIG. 2 is a sectional view of the fastener, and FIG.
The figure is a sectional view showing the assembled state of the decorative sheet.
The figure is a perspective view of a fastener according to a second embodiment of the present invention;
5 is a sectional view of the same, FIG. 6 is a perspective view of a fastener according to a third embodiment of the present invention, FIG. 7 is a sectional view of the same, and FIG.
10 are perspective views of conventional fasteners, and FIG. 11 is a sectional view showing problems with the conventional fasteners. 1... Mounting hole, 2... Board, 4... Leg, 7
... Decorative sheet (attached member), 9 ... Foamed resin layer, 12 ... Foamed resin part, C2 to C4 ... Fastener, B ... Body, S ... Tapping screw.

Claims (1)

[Scope of utility model registration request] It is equipped with a board, legs, and a locking piece to prevent it from coming off, and the member to be attached to the fixed body is pushed into the mounting hole drilled in the fixed body, and the legs are pushed together with the locking piece. A fastener of a type that can be fixed by screwing a fixing screw into the upper surface through a member to be attached, wherein a predetermined range of the part into which the screw is screwed is formed of a foamed resin layer, and the A fastener characterized in that the outer layer of the leg is made of a hard layer.