JP2002303309A - Fastener - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the insertion property and the locking force of a locking leg in a synthetic resin fastener to a through hole made in a panel. SOLUTION: In this fastener comprising a head part 1 and the locking leg 2 perpendicularly suspended from the head part, the locking leg comprises a rigid axial part 2a perpendicularly suspended from a lower side of the head part and a plurality of elastic locking pieces 2b which are disposed surrounding this axial part, continuously provided with an upper end part joined with a lower side of the head part 1 or a base end of the axial part 2a and a lower end part joined with a leg end of the axial part, and separates a middle part in the length from the axial part 2a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for fixing parts to be installed inside an automobile or an electric device to a panel portion of a body or a main body of an apparatus, or fixing another panel to this panel portion in a face-to-face manner. The present invention relates to a stopper formed of a synthetic resin used in a case where the material is attached.

[0002]

2. Description of the Related Art As is known, a large number of synthetic resin fasteners for fastening parts are used in automobiles and home electric appliances. Generally, the fasteners have various forms according to the parts to be fastened, but the fasteners for fastening the parts to the body or equipment main body basically have a head with a larger diameter than the through hole for mounting on the panel. And a locking leg which is suspended from the head and is engaged with the through hole. Usually, some heads are simply flange-shaped, while others have special locking means for fixing parts, but in common, they do not penetrate when the locking legs are inserted, so through holes Usually, it is formed with a larger diameter. On the other hand, the locking leg is merely pushed into the through hole and locked to the edge of the through hole, but the form is various. In particular, this form basically differs depending on the purpose of use. For example, those that are intended to be permanently fixed are those that cannot be pulled out and have, for example, anchor-shaped locking pieces. In order to allow the inserted locking leg to be pulled out, for example, the trunk portion of the locking leg is swellable so as to be reduced in diameter, and the swelling portion is pressed against the through hole and locked by the frictional force. Has become. As described above, the stopper made of a synthetic resin has a different form depending on the purpose, but in each case, the stopper is manufactured by utilizing the characteristics such as the elasticity and rigidity of the material and the moldability. According to the present invention, among the various kinds of stoppers provided, the latter, in particular, the elasticity of the torso is used to forcibly push into the through-hole for mounting, and then push and push the edge of the through-hole with a repulsive force. The stopper has been developed for the purpose of improving the locking leg of the stopper which does not come out by taking into account the frictional force or the like, and which can be pulled out when necessary after insertion.

[0003]

That is, a stopper having a structure in which the elasticity of the body of the engaging leg is used to engage the panel makes it easy to insert the panel into the through hole in addition to the elasticity of the material. Therefore, the inside of the locking leg is often formed hollow. This hollow locking leg is reduced in diameter using the hollow portion at the time of insertion, and is locked at the edge of the through hole by restoring the reduced body portion at the time of insertion, and it has good insertability, There are many practical examples because the required locking force can be obtained by the restoring force after insertion.

[0004] However, while the locking leg of this hollow structure is excellent in the action of reducing the diameter and expanding the trunk, it has a drawback in that it lacks rigidity.
That is, there is no problem when the locking leg made hollow is inserted straight along the center of the through hole of the panel, but at the time of insertion, the leg end touches the edge of the through hole and is inserted. Or if it is inserted diagonally off the center line of the through hole,
It may bend or buckle in a buckling manner, failing to penetrate the through-hole, and completely losing the locking function. In particular, this problem occurs when parts are fastened to the panel using a plurality of fasteners. For example, a case where a trim board as a lining material of an automobile is fixed to a door is one example. That is, when a plurality of stoppers, that is, trim clips are planted at required intervals on the back side of the trim board, and the clips are inserted into the mounting through holes preliminarily drilled in the door, and these are inserted, trimming is performed. When a positional shift occurs due to an error in the mounting position of the clip or an error in the opening position of the mounting through-hole, a clip that is not locked by the through-hole may come out and an incomplete trim board mounting may be performed.

In the case where it is difficult to confirm the state of engagement with the through-hole on the back side of the trim board as typified by the trim clip, the incomplete fastening state must be corrected in advance. In many cases, product assembly is completed as it is. In view of such circumstances, even if a slight error occurs in the entry position of the locking leg with respect to the through hole in view of such circumstances, if the leg end of the locking leg, that is, the tip, faces the inside of the through hole, the seat can be seated. It is an object of the present invention to provide a stopper capable of receiving a push-in without buckling or crushing to form a proper intrusion and lock the through-hole.

[0006]

That is, the present invention relates to a stopper formed of a synthetic resin material having a head and a locking leg which is suspended from a lower surface of the head. And a shaft core portion having a shaft diameter not exceeding the diameter of a through hole formed in the panel by hanging the locking legs straight down from the lower surface of the head, and juxtaposed at a required interval along the shaft core portion. The upper end is formed on the base of the shaft core or the lower surface of the head, and the lower end is formed of an elastic locking piece that is joined to and integrated with the leg end of the shaft core. A bulge having a size larger than the diameter of the through hole of the panel is provided on the outer side surface of the elastic locking leg in the middle of the length, and the bulge is hooked and locked to the edge of the through hole. To provide tools.

In the stopper of the present invention, a required rigidity is held in the locking leg by the shaft core portion, the insertability of the mounting leg into the through hole is improved, and the stopper is integrally formed along the shaft core portion by the elastic locking piece. The locking force against the hole is ensured, the tip of the locking leg comes out of the locked state, and when pressed as it is, it can enter the through hole by the guidance of the shaft core, and it is engaged by bending or crushing In order to avoid the disabled state, on the other hand, after engaging in the through-hole, it is characterized in that the elastic locking piece secures the locked state by a pressing action against the edge of the through-hole. That is, in the stopper of the present invention, the conventional locking leg is constituted by a single body, and the locking leg has two opposing functions of rigidity at the time of insertion and elasticity for securing the locking state with respect to the through hole. On the other hand, the locking leg is divided into a shaft core portion and an elastic locking piece to separate the two functions.

Further, according to the present invention, the elastic locking piece is provided with a required interval in the middle of the length with respect to the shaft core portion, and the elastic locking piece can be bent in the diameter reducing direction by utilizing the gap. On the other hand, the base end and the distal end are integrally joined to the shaft core to improve the insertability into the through hole, and when the required pulling force is applied, the diameter is reduced again and the locking leg is damaged from the through hole. An object of the present invention is to provide a stopper which can be pulled out without any trouble.

The shaft core is not limited to one shape, but the condition is that the diameter of the shaft does not exceed the diameter of the through hole to be inserted. This shaft core is required to have the required rigidity as described above, and is to be guided straight into the through hole at the time of insertion, and to have an elastic locking piece effectively disposed on the peripheral surface thereof, so that the cross section is cross-shaped. It is appropriate that the shape is a column shape such as a T-shape or a Y-shape. Further, from the viewpoint of molding, a cross shape or a T-shape is suitable from the viewpoint of molding.

On the other hand, the elastic locking pieces are arranged side by side along the longitudinal direction of the shaft core portion, and at the same time, bulge outward in the middle of the length to substantially reduce the outer diameter of the through hole of the panel. It is formed in a size exceeding the diameter. A plurality of the elastic locking pieces are provided around the shaft core portion, and when the shaft core portion has the above-mentioned cross-shaped cross section, or when it has a T-shape, between the protruding pieces protruding outward. It is arranged so as to be positioned so as to surround the shaft core portion, and a gap is always provided at a position in the middle of the length away from the shaft core portion. In this state, a plurality of the elastic locking pieces are formed so that a plurality of the elastic locking pieces have a substantially larger outer diameter than the diameter of the through hole. Next, embodiments of the present invention will be described with reference to the drawings, and features of the embodiments will be clarified.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The illustrated embodiment shows an example in which the present invention is applied to a clip for fastening a trim board as a lining material of an automobile. FIGS. 1 to 5 show a first embodiment, and FIG. 6 to 10 show a second embodiment. FIG.
FIG. 2 is a front view showing a use state in which a trim board B is fastened to a door inner wall panel portion A of an automobile using a trim clip which is a stopper of the present invention. FIG. 2 is a side view showing a partial cross section, FIG. 4 is a bottom view, and FIG. 5 is a cross-sectional plan view taken along line AA of FIG.

The stopper of the present invention, that is, the trim clip is made of a thermoplastic synthetic resin having appropriate elasticity and rigidity such as polyacetal, and is formed of a head 1 and a locking leg 2. The head 1 here comprises two steps of flanges 1a and 1b for fastening to the trim board A. The head 1 is mainly composed of a large-diameter circular flange 1a and a neck 1
A small-diameter circular flange 1b is joined to the upper end of the upper portion c to form a two-stage structure at an interval.

On the other hand, the locking leg 2 is engaged with a mounting circular through hole a formed in the panel portion A to fix the head 1 to the panel surface. Shaft portion 2a vertically suspended from the shaft and elastic locking pieces 2b provided side by side with the shaft center portion
It is composed of In this embodiment, the head 1 completely covers and covers the through hole a when the locking leg 2 is engaged with the through hole a, and also has an umbrella-shaped elastic seal for assisting the engagement of the locking leg. The portion 3 is integrally provided on the lower surface of the large-diameter flange 1a, and the shaft core portion 2a and the elastic locking piece 2b extend through the elastic seal portion 3.

As shown in FIG. 5, the shaft core portion 2a is formed in a columnar shape having a cross-shaped cross section, and is derived vertically from the center of the umbrella-shaped seal portion 3. The shaft core 2a is a virtual circle connecting the tips of the four protruding pieces 4 projecting radially outward, that is, the through hole a formed in the panel portion A with a substantial outer diameter of the shaft core. It is formed so as not to exceed the diameter, so that the shaft diameter does not directly become an insertion resistance upon insertion.

The elastic locking pieces 2b are arranged such that each one of the elastic locking pieces 2b is arranged between the protruding pieces 4 in correspondence with the shaft core 2a being formed in a cross-sectional shape. . Here, the upper end of each elastic locking piece is joined to the lower surface of the seal portion 3, and the lower end is joined to the tip of the shaft core 2a, that is, the leg end, and is separated from the shaft core 2a in the middle of the length. It is juxtaposed as above. More specifically, in this embodiment, as shown in the figure, on both sides of the two protruding pieces in the front-rear direction, vertical cuts 5 are provided on both sides of the seal part 3 so as to pass from the lower surface of the seal portion 3 to the leg ends of the shaft core 2a. On the both sides of the protruding piece that protrudes left and right, the middle of the length is cut vertically, and the lower end of the elastic locking piece is joined by the slit 6 which is closed by joining the lower end. The elastic locking piece is cut, and a gap is provided between the elastic locking piece and the protruding piece by the slit 5 and the slit 6.
Here, the difference between the slit 5 and the slit 6 is due to molding reasons, the main purpose of which is to form the gap, and the shape is arbitrarily selected.

Each elastic locking piece 2b has an outer surface formed in a circular arc shape in cross section, and a single circle can be drawn by connecting the outer circumferences of the four locking pieces. Each elastic locking piece is gradually raised from the upper and lower sides in the middle of the length of the outer surface to provide a bulging portion 7, and a maximum diameter portion connecting the apex of the bulging portion is a through hole of the panel portion A. The size exceeds the diameter of a.

The maximum diameter portion of the set of the elastic locking pieces 2b is a shaft core portion 2a smaller than the diameter of the through hole a as shown in FIG.
However, in this embodiment, the difference in the diameter, that is, the protrusion width of the bulging portion 7 is absorbed by the gap formed as the slit 5 and the slit 6, and this gap is utilized. As a result, the entire elastic locking piece is reduced in diameter.

As described above, the clip according to the above-described structure is integrally formed of a synthetic resin material. The clip is first attached to the trim board, and then the locking leg is inserted into the through hole of the panel to fasten the clip. Will do. More specifically, the clip faces the mounting portion C having the keyhole-shaped locking hole b formed on the rear surface of the trim board from the head 1 side,
First, the small-diameter flange 1b is inserted into the large-diameter portion of the locking hole b, and then is moved laterally in this state to move the entire head to the small-diameter portion of the mounting hole, whereby the mounting to the mounting portion C is completed.

FIG. 1 shows this mounting state. In the same manner, clips are fixed to a large number of mounting portions C provided on the rear surface of the trim board B at required intervals, and the locking legs 2 are erected. . After that, the tips of the locking legs 2 are made to face the through holes a formed in the panel portion A of the door corresponding to the respective mounting portions C, and the head 1 is hit from the front side of the board to engage. Let it. At this time, the locking leg 2 protrudes into the through hole a with the straight shaft core portion 2a as a guide, so that the elastic locking piece is reduced in diameter at the edge of the through hole when the bulging portion 7 passes. After passing, it is restored and the locked state is maintained. In addition, this locking leg 2
In order to improve the ease of insertion into the through-hole at the time of engagement, the leg ends may be formed in an inverted conical shape or a truncated conical shape.

FIGS. 6 to 10 show that the shaft core 2a of the locking leg 2 is formed in a T-shaped cross section, and three elastic locking pieces 2b and 2c are arranged so as to surround the shaft core 2a. The second
This is an embodiment of the present invention. The shaft core portion 2a having a T-shaped cross section may have a substantial outer diameter embodied by a single circle connecting the tips of the projecting pieces 8 projecting outwardly smaller than the diameter of the through hole a of the panel portion A. This is the same as the first embodiment. In addition, three elastic locking pieces 2b and 2c arranged so as to surround the shaft core portion.
Is substantially the same as the diameter of the through hole a as in the first embodiment.

The upper ends of the three elastic locking pieces are joined to the lower surface of the umbrella-shaped seal portion 3, and the lower ends are joined to the leg ends of the shaft core 2a to be integrated to form the locking leg 2. At the same time, the slits 9, 10, 11 with the shaft core 2a are used to bend inward. Each of the locking pieces has an outer surface formed into an arc surface along one circumference, and is gradually protruded from an upper end and a lower end to form a bulging portion 1 in the middle of the length.
2, a maximum diameter portion exceeding the diameter of the through hole a is formed in this portion.

The clip shown in the second embodiment is the first clip.
Used in exactly the same manner as in the embodiment of FIG. Of course, when mounting the trim board, the small diameter flange 1 of the head 1 is inserted into the keyhole-shaped mounting hole b of the mounting portion C provided on the back of the board.
Then, the locking leg 2 is attached to the panel A in an upright position, and then the locking leg 2 is made to face the through-hole a of the panel A. Then, the surface of the board is beaten or pressed so that the board is pushed into the board A to be fixed. In this fastening, the shaft core portion 2a serves as a guide, the elastic locking piece locks the bulging portion 12 on the edge of the through hole to secure the locking state, and the seal portion 3 comes into contact with one surface of the panel portion. At the same time as the through holes are closed, elasticity acts to ensure and stabilize the locking state.

As described above, the stopper of the present invention has been described in detail based on the embodiment in which the clip is trimmed. However, the stopper of the present invention has a straight shaft center portion at the center of the locking leg, which is transparent at the time of insertion. The elastic locking piece is drawn into the through-hole by the rigid shaft core at the time of insertion, regardless of the presence of the swelling part, even if there is some misalignment because it guides to the center of the hole. It is possible to engage without bending or crushing in the middle of the pushing, and the bulging portion can be guided into the through hole and securely hooked to the edge thereof.

In the embodiment, the head 1 is composed of two large and small flanges. However, even if the head 1 is composed of only one flange, a locking means such as a hook is provided on the upper surface of the flange-shaped head. It may be provided and may be arbitrarily designed according to the use of the stopper. Further, in the embodiment, the shaft legs having the cross-shaped and T-shaped cross-sections have been described with respect to the locking legs, but may be Y-shaped. These cross-sectional shapes are to uniformly disperse the elastic locking pieces arranged around,
It is selected to ensure the strength of the shaft core and to secure a retreat space when the elastic locking piece is reduced in diameter, and does not hinder the selection of other cross-sectional shapes. In the embodiment, the case where the seal portion 3 is provided on the lower surface of the head has been described, but this may be omitted. Of course, in this case, it goes without saying that the upper end of the elastic locking piece is directly joined to the lower surface of the head or directly joined to the base end of the shaft core so as not to be separated.

[0025]

As described above, according to the present invention, the locking leg of the stopper comprises the shaft core and the elastic locking piece, and the shaft core has rigidity and the elastic locking piece has elasticity. Since the function of the locking leg is divided into two, there is an advantage that the insertion force is excellent and the locking force is also excellent. In addition, even if there is a slight displacement with respect to the through hole at the time of insertion, the guide of the shaft core acts, so that a stable locking state is obtained without buckling or crushing. There is an advantage that the locked state can be avoided.

[Brief description of the drawings]

FIG. 1 is a front view for explaining a use state shown in a case where a fastener of the present invention is applied to a trim clip to fasten a trim board to a panel portion of an automobile door.

FIG. 2 is a front view of the stopper with a part cut away.

FIG. 3 is a right side view in which the left half of the stopper is a cross section at the center.

FIG. 4 is a bottom view of the stopper.

FIG. 5 is a plan view showing a cross section taken along line AA of FIG. 2;

FIG. 6 is a partially cutaway front view showing another embodiment in which the clip of the present invention is applied to a trim clip.

FIG. 7 is a right side view of the stopper with a part cut away.

FIG. 8 is a rear view of the stopper.

FIG. 9 is a bottom view of the stopper.

FIG. 10 is a plan view of a section taken along line BB of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Head 2 Locking leg 2a Shaft core part 2b Elastic locking piece 4 Shaft core part protruding piece 7 Swelling part A Panel a Through-hole

Claims (3)

[Claims] 1. A composite comprising a head and a locking leg vertically provided from a lower surface of the head, wherein the locking leg is fixed to the panel by pushing the locking leg into a through hole of the panel. In a resin stopper, the locking leg is vertically suspended from the lower surface of the head and has a shaft diameter not exceeding the diameter of the through hole of the panel. The upper end is joined to the base of the shaft core or the lower surface of the head, and the lower end is joined to the leg end of the shaft to be integrated. And a plurality of bulging portions each having a size exceeding the diameter of the through hole of the panel are formed on the outer side surface of the elastic locking piece on the middle of the length. A stopper adapted to be locked by hooking a portion to an edge of a through hole of the panel. 2. The shaft core portion according to claim 1, wherein the shaft core portion is formed in a cross shape with a cross shape and provided with four projections projecting radially outward, and an elastic locking piece is provided between the projections. A fastener characterized by disposing. 3. The shaft core according to claim 1, wherein the shaft core has a T-shaped or Y-shaped cross-sectional shape and is provided with projections protruding outward, and an elastic locking piece is provided between the projections. Stoppers characterized by being arranged in each case.