JP3740921B2 - Spring nut - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a spring nut used for fixing another member to an outer surface of a flange portion bent in an approximately L shape from an end portion of a synthetic resin component.
[0002]
[Prior art]
Taking the front part of an automobile as an example, as shown in FIG. 5, there is one in which a spoiler 2 is attached to the lower end of the front bumper 1 to rectify the air flow in the lower part of the vehicle. Generally, the front bumper 1 and the spoiler 2 are made of a synthetic resin plate. The front bumper 1 has a left and right sides that are gently curved rearward, and a flange 11 that is bent in an L shape inwardly on both sides. The spoiler 2 has a shape that matches the front bumper 1.
[0003]
When the spoiler 2 is attached to the front bumper 1, as shown in FIG. 6, a plurality of substantially U-shaped spring nuts 3 are fitted to the lower end edge of the front bumper at predetermined intervals, and the spoiler 2 is attached thereto. The pieces 20 are overlapped, and the bolts 4 are fastened and attached from the spoiler 2 side.
[0004]
Further, at both the left and right end portions of the spoiler 2, as shown in FIG. 7, a U-shaped spring nut 3A is fitted to the flange portion 11 of the front bumper 1, and the flange portion 21 of the spoiler 2 is overlapped with the spring nut 3A. Thus, the bolt 4 is fastened to the screw hole 321 formed in the spring nut 3 </ b> A from the flange portion 21 side so as to be attached together with the flange 11 of the front bumper 1. In this case, the length of the flange portion 11 of the front bumper 1 is normally set to 15 mm or more in order to secure a drilling space.
[0005]
Further, when the spoiler 2 is attached as a dealer option, it is difficult for the dealer to drill the bolt 4 through the flange 11 of the front bumper 1, so as shown in FIG. The spring nut 3B is bent at both ends, and the spring nut 3B is fitted to the flange portion 11 so that the opening 30 is hooked on the corner portion of the flange of the front bumper 1, and the spoiler 2 is The flange portion 21 is overlaid on the spring nut 3B, and the bolt 4 is fastened and attached at a position away from the tip of the flange portion 11 of the front bumper 1. In this case, if the length of the flange portion 11 of the front bumper 1 is 10 mm or less, the spring nut 3 </ b> B is loosened by the tightening force when the bolt 4 is tightened and cannot be tightened.
[0006]
[Problems to be solved by the invention]
However, in any of the mounting structures shown in FIGS. 7 and 8, when the flange length of the front bumper 1 is set to 10 mm or more, when the front bumper 1 is molded with a mold, the flange portion 11 is removed from the mold. Since it is difficult, there is a problem that the mold structure becomes complicated by providing a slide mechanism in the mold to facilitate extraction, and the production cost is high. Further, when the spoiler 2 is set during the start of mass production, the flange 11 of the front bumper 1 may not have a sufficient length to allow the spoiler 2 to be mounted with the mounting structure of FIGS. In this case, there is a problem that the front bumper 1 and its mold must be redesigned.
[0007]
The present invention pays attention to such problems, shortens the flange length of the parts, makes it possible to mold the front bumper with a mold having a simple structure, eliminates the need for drilling the front bumper, and further increases the flange length. An object of the present invention is to provide a spring nut that can be tightened without wobbling even when the bolt is tightened.
[0008]
[Means for Solving the Problems]
The invention according to claim 1 is a spring nut for overlapping and fixing other parts on the outer surface of the flange part extending from the end part of the synthetic resin part via the bent part, the flange part When both ends of the opening side are formed to be engageable with the bent portion and the flange portion is inserted into the inner side plate portion of the opposite side plate portions. A screw hole in which a bolt is screwed into a portion not fitted to the flange portion on the front end side of the flange portion, and the screw hole is formed on the outer side plate portion on which the other parts are overlapped. A through hole is formed in the opposite position to allow a bolt to be screwed into the screw hole from the other component side, and the inner side of the spring nut is located at the opening end side on both side edges of the outer side plate portion. Projecting diagonally toward the tip and the tip is inside the spring nut Characterized by forming the locking claw bite into the outer surface of the off to the flange portion. As a result, even if the dimension of the flange part of the part is shortened, the claw part of the spring nut is locked so as to be difficult to fit into the flange part when tightening with a bolt, and the spring nut does not wobble and is stable and easy to tighten. .
[0009]
According to a second aspect of the present invention, in the spring nut of the first aspect of the invention, the inner side plate is disposed on both side edges of the outer side plate portion so as to cross the inside of the spring nut from a position closer to the through hole than the locking claw. A stopper piece is formed which extends toward the portion and contacts the tip of the flange portion when the flange portion is fitted into a spring nut. As a result, the stopper piece abuts against the tip of the flange portion at the time of bolt tightening to prevent the spring nut from wobbling, making the spring nut more stable and further facilitating the bolt tightening operation.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
1, 3 and 5 show a first embodiment of the present invention. In FIG. 5, the front bumper 1 is made of synthetic resin, and a synthetic resin spoiler 2 is attached to the lower end edge thereof. As shown in FIG. 3, the flange portions 21 at the left and right ends of the spoiler 2 are bent inwardly in an L shape from the spoiler body so as to cover the outer surfaces of the flange portions 11 at the left and right ends of the front bumper 1. The length of the flange portion 11 of the front bumper 1 is set to a short dimension of about 5 mm. The spring nut 3C is fitted to the flange portion 11, the flange portion 21 of the spoiler 2 is overlapped with the spring nut 3C, and the flange portion 11 is not on the distal end side of the flange portion 11 of the spring nut 3C from the outside of the flange portion 21. The spoiler 2 is attached by tightening the bolt 4 into the fitting portion.
[0011]
As shown in FIG. 1, the spring nut 3 </ b> C is formed by folding a thin strip steel plate into a substantially U-shaped cross section, and both ends of the opening 30 are bent in the same direction in a substantially square shape. The front bumper 1 can be easily fitted to the flange 11. The length of the spring nut 3C is approximately twice the length of the flange portion 11 of the front bumper 1, and of the side plate portions 32, 33 extending from the bottom portion 31 and facing each other, the side of the opening portion 30 in the bending direction, that is, the inner side plate portion. A screw hole 321 is formed in the position 32 slightly closer to the bottom 31. A through-hole 331 for penetrating the bolt 4 is formed in the outer side plate portion 33 at a position corresponding to the screw hole 321.
[0012]
The distance between the side plate portions 32 and 33 is set so as to be gradually narrowed from the bottom portion 31 toward the bent portion of the opening portion 30 to increase the clamping force of the front bumper 1 against the flange portion 11.
[0013]
On both side edges of the outer side plate portion 33, a C-shaped notch groove 332 is provided at a position slightly closer to the opening 30 than the through hole 331, and an end of each notch groove 332 on the opening 30 side. The part forms a sharp locking claw 333 that protrudes obliquely upward toward the inner depth of the spring nut 3C.
[0014]
As shown in FIG. 3, in order to fix the spring nut 3 </ b> C to the flange portion 11 of the front bumper 1, the opening portion 30 of the spring nut 3 </ b> C is pushed in from the front end side oblique direction of the flange portion 11 of the front bumper 1. The flange portion 11 is inserted into the spring nut 3 </ b> C by further pushing in while rotating with the bent portion as a fulcrum. At this time, since the locking claw 333 of the spring nut 3C protrudes obliquely in the direction opposite to the rotation direction of the spring nut 3C, the locking claw 333 is not caught by the flange portion 11, and the spring nut 3C is pressed with a small force. You can push in. The spring nut 3 </ b> C is fitted to the flange portion 11 by the bent opening 30 engaging with the bent portion at the flange base of the front bumper 1.
[0015]
In order to attach the flange portion 21 of the spoiler 2 to the front bumper 1, as shown in FIG. 3, the flange portion 21 of the spoiler 2 is overlapped on the outer surface side of the flange portion 11 of the front bumper 1 fitted with the spring nut 3C. The bolt 4 is tightened from the outside of the flange portion 21 to the screw hole 321 from the through hole 331 of the spring nut 3C. When the bolt 4 is tightened, a force is applied from the Z direction, but the locking claw 333 is prevented from sticking into the flange portion 11 , so that the loose spring nut 3 </ b> C is prevented from wobbling, so that the tightening can be easily performed.
[0016]
2 and 4 show a second embodiment of the present invention. The spring nut 3D is further provided on both side edges of the outer side surface portion 33 via the notch grooves 332 with respect to the spring nut 3C. A stopper piece 334 facing the locking claw 333 is cut and raised. The stopper piece 334 crosses the inside of the spring nut 3D and extends in the perpendicular direction toward the inner side plate portion 32. And the notch groove 322 is formed in the both-sides edge of the inner side board part 32 facing the stopper piece 334, and interference with the front-end | tip part of the stopper piece 334 is avoided. The other structure of the spring nut 3D is substantially the same as that of the spring nut 3C.
[0017]
The fitting of the spring nut 3D to the flange portion 11 of the front bumper 1 and the fastening of the flange portion 21 of the spoiler 2 are performed in the same procedure as in the first embodiment. In the case of the spring nut 3D, the front end of the flange portion 11 fitted therein is in contact with the stopper piece 334 of the spring nut 3D. Therefore, when the bolt 4 is tightened, the rotation of the spring nut 3D is more firmly prevented by the stopper piece 334 that comes into contact with the front end of the flange portion 11 of the front bumper 1 even when a force in the Z direction shown in FIG. Work becomes extremely easy.
[0018]
【The invention's effect】
When the spring nut of the present invention is used and the flange portions at both ends of the spoiler are overlapped and bolted and fixed to the flange portions at both ends of the front bumper of the automobile, even if the flange portion of the front bumper is short, it is stable and easy to work with. Bolt can be tightened. Accordingly, since the flange portion of the front bumper can be shortened, the front bumper can be formed with a mold having a simple structure. Further, it is not necessary to drill a hole for inserting a bolt into the flange portion of the front bumper. The spring nut of the present invention is not limited to a front bumper of an automobile, and can be applied to a case where other members are bolted and fixed to a short flange portion of another synthetic resin component.
[Brief description of the drawings]
FIG. 1 shows a spring nut of the present invention, FIG. 1 (A) is a side view, FIG. 1 (B) is a view as seen from the direction of arrow B in FIG. 1 (A), and FIG. ) Is a C arrow view.
FIG. 2 shows another spring nut of the present invention, FIG. 2 (A) is a side view, FIG. 2 (B) is a view taken in the direction of arrow B in FIG. 2 (A), and FIG. 2 (C) is FIG. It is C arrow line view of (A).
FIG. 3 is a cross-sectional view showing a state in which components are fixed using the spring nut shown in FIG. 1;
4 is a cross-sectional view showing a state in which components are fixed using the spring nut shown in FIG. 2;
FIG. 5 is a perspective view of a front portion of a vehicle in which a spoiler is attached to a front bumper.
6 is a cross-sectional view taken along a line XX in FIG.
7 is a cross-sectional view showing a conventional structure at a position along line YY in FIG.
FIG. 8 is a cross-sectional view showing another conventional structure at a position along line YY in FIG.
[Explanation of symbols]
1 Front bumper (synthetic resin parts)
11 Flange 2 Spoiler (Other parts)
21 Flange 3C, 3D Spring nut 30 of the present invention Opening 31 Bottom 32, 33 Side plate 321 Screw hole 331 Through hole 333 Locking claw 334 Stopper piece 4 Bolt

Claims (2)

A spring nut for stacking and fixing other components on the outer surface of a flange portion extending from a bent portion at the end of a synthetic resin component, and having a cross-section substantially sandwiching the flange portion from both sides U-shaped opening-side end portions are formed so as to be engageable with the bent portion, and among the opposite side plate portions, the inner side plate portion is inserted into the flange portion when the flange portion is fitted. A screw hole into which a bolt is screwed is formed at a portion that is not fitted to the flange portion, and the screw hole is formed at a position facing the screw hole on the outer side plate portion on which the other parts are overlapped. A through-hole is formed through which a bolt to be screwed into from the other component side is formed, and at both side edges of the outer side plate portion, the tip protrudes obliquely toward the inner end of the spring nut at a position on the opening end side. The above-mentioned franc fitted in the spring nut Spring nut, characterized in that the formation of the locking claw bite into the outer surface of the part.   In the spring nut according to claim 1, the both side edges of the outer side plate portion extend toward the inner side plate portion so as to cross the inside of the spring nut from the position on the through hole side than the locking claw, A spring nut characterized in that a stopper piece is formed with which the tip of the flange portion abuts when the flange portion is fitted into the spring nut.

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