JPH074413A - Plastic fastener - Google Patents

Abstract

PURPOSE:To provide a plastic fastener which can absorb the scatter of the thickness of a second member, and also can cope with a few difference in the thickness of the second member only by one kind of it. CONSTITUTION:This plastic fastener 17 is used for installing a first member formed with a first installation hole 15 onto a second member formed with a second installation hole 19. The fastener is made up of a head section 21, a seat section 25, and of an anchor section 27. The anchor section 27 is made up of a column section 29 extending from the back face of the seat section 25, and of paired locking elastic arm sections 33 directed to the seat section 25 from the tip end of the column section 29. Each locking fin 35 which connects a site at the outer circumferential side of the tipe end of each locking elastic arm section to the column section 29 and the backface of the seat section 25, and is located along the surface of a truncated cone roughly identical in diameter to the second installation hole 19 at its small diameter side, is formed in a two-fold axis of symmetry manner at the tip ends of the locking elastic arm sections 33.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic fastener (hereinafter, simply referred to as "fastener") used for attaching a first member having a first mounting hole to a second member having a second mounting hole. Sometimes referred to as). In particular, the present invention is suitable for mounting a rubber automobile weather strip (first member) to a vehicle body sheet metal (second member).

[0002]

2. Description of the Related Art Here, a case where a weather strip (first member) is attached to a vehicle body sheet metal (second member) will be mainly described as an example, but the present invention is not limited to this.

The weather strip 11 is attached to the vehicle body sheet metal 13 by forming a first attachment hole (usually a round hole) 15 in the weather strip 11 and attaching a fastener 17 through the first attachment hole 15. 17 is inserted into the second mounting hole 19 formed in the vehicle body metal plate 13. (See Figures 1-2).

Basically, the fastener 17 is formed through a head portion 21 that engages with the front side (fastener body insertion facing side) peripheral edge of the first mounting hole 15 and a neck portion 23 from the back surface of the head portion 21. The second mounting hole 19 includes a seat portion 25 that engages with the front side peripheral edge, and an anchor portion 27 that extends from the back surface of the seat portion 25 and engages with the back side peripheral edge of the second mounting hole 19. And
The anchor portion 27 is a pillar portion 29 extending from the back surface of the seat portion 25.
And a pair of locking elastic arm portions 33 having locking claw portions 31 at the tips thereof from the tip end side of the column portion 29 toward the seat portion 25.

The fastener 17 is made of a hard plastic such as polypropylene, polyamide or polyacetal by injection molding or the like.

A technical idea similar to this prior art is disclosed in Japanese Utility Model Publication No. 59-20016.63-119112,
It is described in JP-A-4-296209.

[0007]

Recently, due to the structure of the sheet metal of the vehicle body (two-piece fitting flange, three-piece fitting flange, etc.), it inevitably occurs, and in order to improve productivity, the tolerance of the sheet thickness variation is increased. (Tolerance) setting tends to increase. For this reason, in the case of the fastener having the above configuration, it is necessary to prepare two or more types of fasteners having locking elastic arm portions corresponding to respective plate thicknesses. That is, a plastic fastener 17 corresponding to the body sheet metal 13 which is a thick plate as shown in FIG.
2 is applied to a thin metal plate 13A of the vehicle body, the locking claw portion 31 of the locking elastic arm portion 33 does not lock with the second mounting hole 19 and rattling occurs.

It is not preferable to use two or more fasteners on the same weather strip because erroneous assembly is likely to occur.

In view of the above, the present invention provides a plastic fastener that can absorb the variation in the thickness of the second member such as the sheet metal of the vehicle body and can handle one type even if the thickness of the second member is slightly different. With the goal.

[0010]

The fastener of the present invention comprises:
The above means is solved by the following means.

A plastic fastener used for attaching a first member having a first mounting hole to a second member having a second mounting hole, the head engaging with a front side peripheral edge of the first mounting hole. Portion, a seat portion formed from the back surface of the head portion through the neck portion to engage with the front side peripheral edge of the second mounting hole, and an anchor portion extending from the back surface of the seat portion and engaging with the back side peripheral edge of the second mounting hole. The anchor portion is a plastic fastener having a configuration including a pillar portion extending from the back surface of the seat portion and a pair of locking elastic arm portions extending from the tip end side of the pillar portion toward the seat portion. The locking fins, which connect the outer peripheral side of the tip and the rear surface of the column and the seat, and which extend along the truncated cone surface whose diameter is approximately the same as the second mounting hole, are It is formed with a double axisymmetric at the tip,
It is characterized by

[0012]

The operation and effect of the invention The plastic fastener of the present invention has the following operation and effects due to the above constitution.

Fastener 1 attached to first member 11
The anchor portion 27 of 7 is attached to the second attachment hole 1 of the second member 13.
When inserting the first member 11 into the second member 13 by inserting it into the second member 13, the second member 13 is attached to the second member 13 at the tip (small diameter) side of the truncated cone surface of the locking fin 35. Thirteen
When the plate thickness is thick, the locking fins 35 are locked to the second mounting holes 19 on the base (large diameter) side of the truncated cone surface without rattling. Therefore, it is possible to absorb the variation in the thickness of the vehicle body sheet metal, and as a result, even if the thickness of the second member (vehicle body sheet metal) is slightly different, one type of plastic fastener can be used.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS. The same parts as those in the above-described example are designated by the same reference numerals, and the description thereof will be omitted in whole or in part.

A weather strip (first member) 1 in which a plastic fastener first mounting hole 15 of the embodiment is formed.
1 is used for mounting the sheet metal 1 on the vehicle body sheet metal (second member) 13, 13A in which the second mounting hole 19 is formed.

A head portion 21 which engages with the front side peripheral edge of the first mounting hole 15, and a seat portion 25 which is formed from the back surface of the head portion 21 via a neck portion 23 and engages with the front side peripheral edge of the second mounting hole 19.
The anchor portion 27 extends from the back surface of the seat portion 25 and engages with the back side peripheral edge of the second mounting hole 19. The anchor portion 27 includes a pillar portion 29 extending from the back surface of the seat portion 25, and a pair of locking elastic arm portions 33 extending from the tip end side of the pillar portion 29 toward the seat portion 25. Up to this point, the process is the same as in the above example.

Here, in the illustrated example, the head portion 21 has a boat shape, but may have any shape such as a round shape, an elliptical shape, and a square shape as long as it can be inserted into the first mounting hole 15 and can be locked at the front side peripheral edge. Also,
The seat portion 25 has a round shape, but may have an oval shape, a square shape, or the like as long as it can be engaged with the front side peripheral edge of the second mounting hole 19. The cross-sectional shape of the pillar portion 29 is rectangular, but may be elliptical, round, or polygonal. Further, the tip end cross section of the locking elastic arm portion 33 is a split circle (bow shape) cross section having an outer circumference that is concentric with the seat portion 25, but may be rectangular or the like. Also,
The shape of the seat is not limited to the umbrella shape.

In the present embodiment, the locking elastic arm portion 33 is provided.
The locking fins 35 that connect the outer peripheral side of the tip and the rear surface of the column 29 and the seat 25, and the locking fins 35 along the truncated conical surface whose diameter is substantially the same as the second mounting hole 19, are provided in each locking elasticity. Arm 33
Is formed at the tip of the two-fold axis symmetrically (see FIGS. 5-6). The thickness of the locking fin is usually 0.2 to 0.5 mm so as to have appropriate flexibility and impact resilience.

Next, the manner of use of the above embodiment will be described with reference to FIGS.
It will be described based on.

The head portion 21 of the fastener 17 is inserted and locked in the first mounting hole 15 of the weather strip 11 to be attached to the weather strip 11 of the fastener 17.

Next, the anchor portion 27 of the fastener 17
Is inserted into the second mounting hole 19 of the vehicle body sheet metal 13. Then, after the locking elastic arm portion 33 of the anchor portion 27 is forced to bend and passes through the second mounting hole 19, the locking elastic arm portion 33 elastically returns, and the locking elastic arm portion 33 moves. As a result, the weather strip 11 and the vehicle body sheet metal 13 are sandwiched between the locking fins 35 and the back surface of the seat portion 45.

That is, when the thickness of the body sheet metal 13 is thin,
On the small-diameter side of the frustoconical surface of the locking fin 35 (see FIG. 7), when the plate thickness of the vehicle body sheet metal 13A is large, on the large-diameter side of the frustoconical surface of the locking fin 35 (see FIG. 8), respectively. Engages with the mounting hole 19 without rattling. Therefore, variations in the plate thickness of the vehicle body sheet metal 13 can be absorbed, and as a result, one fastener can cope with the vehicle body sheet metal (second member) 13 having a slightly different sheet thickness.

[Brief description of drawings]

FIG. 1 is a sectional view of a conventional usage example of a fastener for thick plates.

FIG. 2 is a sectional view of a usage state when a fastener for a thick plate is also applied to a thin plate.

FIG. 3 is a front view showing an example of the fastener of the present invention.

FIG. 4 is a view taken along the line IV-IV in FIG.

5 is a cross-sectional view taken along the line VV of FIG.

6 is a sectional view taken along the line VI-VI of FIG.

7 is a cross-sectional view of a usage state in which the fastener of FIG. 3 is applied to a thin plate (second member).

8 is a cross-sectional view of a usage state in which the fastener of FIG. 3 is applied to a thick plate (second member).

[Explanation of symbols]

 11 Weather Strip (First Member) 13, 13A Body Sheet Metal (Second Member) 15 First Attachment Hole 17 Fastener 19 Second Attachment Hole 21 Fastener Head 23 Fastener Neck 25 Fastener Seat 27 Fastener Anchor 29 Fastener pillar part 31 Engagement step part of anchor part 33 Locking elastic arm part 35 Locking fin

Claims (1)

[Claims] 1. A first member having a first mounting hole,
A plastic fastener used for mounting on a second member having a second mounting hole, the head being engaged with the front side peripheral edge of the first mounting hole, and formed from the back surface of the head through the neck. A seat portion that engages with the front side peripheral edge of the second mounting hole, and an anchor portion that extends from the back surface of the seat portion and engages with the back side peripheral edge of the second mounting hole, wherein the anchor portion is A pillar extending from the back,
A plastic fastener comprising a pair of locking elastic arm portions extending from the tip end side of the pillar portion toward the seat portion, wherein a distal end outer peripheral side portion of the locking elastic arm portion and the pillar portion and the seat portion are provided. Locking fins that connect to the back surface and that extend along a truncated cone surface that has a diameter that is substantially the same as the diameter of the second mounting hole are formed at the tips of the locking elastic arm portions in a two-fold axial symmetry. A plastic fastener characterized by that.