JPH11339893A - Locking structure of resin molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably prevent abnormal sound from being produced by suppressing horizontal and vertical backlash of a resin molding. SOLUTION: In a locking structure of a resin molding to engage by sliding a rib 11 with a guide 21, it is so structured that one and another resin moldings 10, 20 are equipped with a first locking piece 12 of a flat piece with a fixed length molded on one resin molding, which has a vertical elasticity and extends opposite to the insertion direction of one resin molding to another resin molding, a second locking piece 22 of a flat piece with a different length from the first locking piece having vertical elasticity molded on another molding, which extends in the insertion direction of one resin molding to another resin molding and abuts on the first locking piece when one resin molding is engaged by sliding with another resin molding, and a first and a second flexible pieces 23, 24 of a pair of flat pieces with different lengths having horizontal elasticity molded on another resin molding, which presses the first locking piece abutting on the second locking piece against the second locking piece.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock structure for a resin molded product in which one resin molded product such as a fuse box mounted on a vehicle and another resin molded product such as a connector or a cassette are connected to each other. About.

[0002]

2. Description of the Related Art Conventionally, when a plurality of resin molded products are mounted on a vehicle, two or more resin molded products have been connected to each other by a lock structure. Then, the lock structure of the resin molded product is provided with a rattling preventing means for preventing generation of unpleasant abnormal noise due to rattling of the resin molded product subjected to vibration of the engine or the like.

[0003] As a conventional lock structure of a resin molded product, for example, there is a lock structure proposed in Japanese Utility Model Laid-Open No. 4-136885, which will be described below with reference to the drawings. 4A and 4B are perspective views showing a lock structure of a conventional resin molded product, wherein FIG. 4A shows one and another resin molded product in a separated state, and FIG. Indicates the product.

In FIGS. 1 (a) and 1 (b), a plate-shaped bracket 110 is integrally formed on one resin molded product 100, and a rectangular through hole 111 is provided at the center of the bracket 110. It is.

On the other hand, another resin molded product 200 is integrally formed on its upper surface with a guide 210 in which a side wall 210a and an upper wall 210b are coupled in a substantially U-shape. The bracket 110 slide-fits into the guide 210.

The height of the side wall 210a of the guide 210 is slightly higher than the thickness of the bracket 110 so that a clearance is formed between the bracket 110 to be slid and the upper wall 210b. .

The opposite side walls 21 of the guide 210
A pair of flexible grip portions 211 and 211 having a horizontal elastic force are integrally formed on Oa. When the bracket 110 is slidably fitted to the guide 210, the flexible grip portions 211 and 211
Of the bracket 110 to prevent rattling of the bracket 110 to prevent generation of abnormal noise.

Further, a guide 2 of another resin molded product 200
At the center of the upper surface surrounded by 10, a locking claw 212 is integrally formed. When the bracket 110 slides into the guide 210, the locking claw 212
10 into the through hole 111, and the bracket 11
Zero longitudinal movement is restricted.

[0009]

However, in the lock structure of the conventional resin molded product described above, the flexible grip portion 211,
The rattle 211 in the horizontal direction of the bracket 110 can be prevented by the through hole 111 and the locking claw 212, but since there is no means for preventing the rattle of the bracket 110 in the vertical direction, the bracket 110 and the guide There is a problem that rattling occurs in the vertical direction within the clearance of the upper part 210 (the upper wall 210b), and unpleasant noise is generated.

If no clearance is formed between the bracket 110 and the guide 210, the bracket 11
Zero rattling in the vertical direction does not occur, but in this case, the bracket 110 and the guide 210 cannot be smoothly inserted and removed, and there is a problem that it is difficult to join and separate the resin molded products.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to suppress rattling in a horizontal direction and a vertical direction of resin molded articles connected to each other and to reliably prevent generation of abnormal noise. It is an object of the present invention to provide a lock structure for a resin molded product which can be easily connected and separated from each other.

[0012]

In order to achieve the above object, a lock structure for a resin molded product according to the present invention is provided in which one resin molded product and another resin molded product are connected to each other by sliding fitting of a rib and a guide. In the lock structure of a resin molded product to be joined, a plate-like piece having a certain length and having elasticity in a vertical direction integrally formed with the one resin molded product, wherein the other resin of the one resin molded product is A first locking piece extending on the opposite side to the insertion direction with respect to the molded article, and a plate-shaped piece having a length different from that of the first locking piece integrally formed on the other resin molded article and having elasticity in the vertical direction. A second engaging member that extends in the insertion direction of the one resin molded product with respect to the other resin molded product, and abuts on the first locking piece when these one and the other resin molded product are slidably fitted. Stop piece and horizontal direction integrally molded with the other resin molded product A first and a second flexible pair of plate-like pieces having different lengths, each of which has a different elasticity and presses the first locking piece in contact with the second locking piece against the second locking piece. Preferably, the first locking piece has a notch, and the second locking piece has a protrusion that abuts an inner surface of the notch.

According to such a configuration, the second locking piece is
By contacting the first locking piece, the one resin molded article and the other resin molded article are connected to each other, and the first and second flexible pieces are connected to the first locking piece by the second locking piece. , The contact between the first and second locking pieces is maintained, and the joined state of one resin molded product and another resin molded product is maintained.

Further, the first and second locking pieces having elastic force in the vertical direction absorb vibration in the vertical direction, and the first and second flexible pieces having elastic force in the horizontal direction allow horizontal vibration. Directional vibration is absorbed. As a result, it is possible to suppress rattling of the one or other resin molded products in the vertical and horizontal directions, and it is possible to reliably prevent unpleasant noise.

Further, even when a clearance is provided between the rib and the guide that are slid and fitted with each other, the vertical play of one or another resin molded product can be suppressed. Insertion and removal of these ribs and guides can be performed smoothly while suppressing sticking, and coupling and separation of one resin molded product and another resin molded product can be easily performed.

Here, the member having a certain length resonates when it receives vibration (for example, vibration of the engine) corresponding to its natural frequency. Or, even if the first and second flexible pieces are simply components of the lock structure of the resin molded product, as long as they resonate at their natural frequency, they are of no use in preventing the generation of unpleasant noise. is not.

Therefore, in the lock structure for a resin molded product of the present invention, the lengths of the pair of first and second locking pieces are made different from each other, and the lengths of the pair of first and second flexible pieces are also made longer. By making them different from each other, their natural frequencies are made different from each other, and when one receives a vibration matching the natural frequency, the other cancels its resonance. Thereby, generation of abnormal noise due to resonance of the first and second locking pieces or the first and second flexible pieces can also be reliably prevented.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the lock structure for a resin molded product of the present invention will be described below with reference to the drawings. FIG. 1 shows a lock structure of a resin molded product according to an embodiment of the present invention, and FIG.
FIG. 2B is a perspective view of a main part of another resin molded product. FIG. 2 is a plan view showing another resin molded product. 3 (a) and 3 (b) are cross-sectional views showing the separated and joined state of the one resin molded product and another resin molded product.

In FIG. 1A, reference numeral 10 denotes one resin molded product, while reference numeral 20 in FIG. 1B denotes another resin molded product. Each component of the lock structure of the present embodiment is provided on each of the upper surfaces of the resin molded products 20. For convenience of explanation, one resin molded product in FIG. 1A is shown upside down (see FIGS. 3A and 3B).

In FIG. 1A, one resin molded product 10
A pair of ribs 11, 11 bent outwardly in an L-shape or an inverted L-shape are formed integrally on the lower surface at a predetermined interval.

On one side between the ribs 11, a first engaging piece 12 bent at a right angle is integrally formed. The first locking piece 12 is a plate-like piece having a certain length and having elasticity in the vertical direction, and is formed of one resin molded product 10 and another resin molded product 2.
0 extends in the direction opposite to the insertion direction.

A rectangular notch 12A is provided at the terminal end of the first locking piece 12, and a rear end surface (inner surface) of the notch 12A is formed by a second engaging member (described later) of another resin molded product 20. Stop piece 22
Contact surface 12a.

In FIG. 1B and FIG. 2, a pair of guides 21 and 21 bent in an L-shape and an inverted L-shape toward the inside are fixed on the upper surface of another resin molded product 20. It is integrally molded with a gap. The ribs 11 of one resin molded product 10 are slidably fitted to the guides 21 and 21, respectively.

Here, each of the guides 21 and 21 is connected to the side wall 21.
a and the upper wall 21b, and the height of the side wall 21a is
The thickness of the rib 11 is slightly higher than that of the upper wall 21b so that a clearance is formed between the rib 11 to be slid and the upper wall 21b.

A single groove 2 is provided between the guides 21 and 21.
0a is formed, and at the substantially center of the groove 20a, the second locking piece 22 extending in the insertion direction of one resin molded product 10 into another resin molded product 20 is integrally formed.

A substantially triangular engaging claw (projecting portion) 22A having a vertical contact surface 22a and an inclined guide inclined surface 22b protrudes from the distal end side of the second engaging piece 22. . The contact surface 22a of the locking claw 22A is in contact with the first locking piece 12 described above.
This is for the contact surface 12a of the notch 12A. In addition, the guide inclined surface 22b of the locking claw 22A slides on the first locking piece 12 in the process of inserting one resin molded product 10 into another resin molded product 20, and the second locking piece 22 is formed into the groove 20a. And the first locking piece 12 passes smoothly.

As shown in FIG. 3A, the length L2 of the second locking piece 22 is shorter than the length L1 of the first locking piece 12 of one resin molded product 10. .

In FIG. 1B and FIG. 2, each guide 2
First and second flexible pieces 23 and 24 are integrally formed at the ends of the first and the second, respectively. These first and second flexible pieces 23 and 24 are a pair of plate-shaped pieces having different lengths L3 and L4, and are the first member of one resin molded product 10 inserted into another resin molded product 20. It has a horizontal elastic force against the stopper piece 12.

In the lock structure of the resin molded product according to the present embodiment having the above-described structure, as shown in FIGS. 3 (a) and 3 (b),
When one resin molded product 10 is inserted into another resin molded product 20 and the respective ribs 11 and guides 21 are slid and fitted,
The locking claw 22A of the second locking piece 22 enters the notch 12A of the first locking piece 12, and the contact surface 12a of the notch 12A.
And the contact surface 22a of the locking claw 22A abut each other. As a result, retreat of one resin molded product 10 is prevented, and one resin molded product 10 and another resin molded product 20 are connected to each other.

At the same time, the first and second flexible pieces 23,
24 comes into contact with the front surface 12 b of the first locking piece 12 and presses the first locking piece 12 against the locking claw 22 </ b> A of the second locking piece 22.
Thereby, the contact between the notch 12A of the first locking piece 12 and the locking claw 22A of the second locking piece 22 is maintained, and the coupling state of one resin molded product 10 and another resin molded product 20 is maintained. Is maintained.

According to the lock structure of the resin molded product of the present embodiment, the first and second locking pieces 12 and 22 having the elastic force in the vertical direction absorb the vibration in the vertical direction, and The horizontal vibration is absorbed by the first and second flexible pieces 23 and 24 having elasticity in the horizontal direction.
Thereby, the rattling of the one or other resin molded products 10 and 20 in the vertical direction and the horizontal direction can be suppressed, and generation of unpleasant abnormal noise can be reliably prevented.

Further, ribs 1 which are slidably fitted to each other
Even when a clearance is provided between the guides 21 and 11 and the guides 21 and 21, the rattling of the one or other resin molded products 10 and 20 in the vertical direction can be suppressed. The ribs 11 and 11 and the guide 2
1, 21 can be smoothly inserted and removed, and one resin molded product 10 and another resin molded product 20 can be easily coupled and separated.

In addition, in the lock structure of the resin molded product of the present embodiment, the lengths of the pair of first and second locking pieces 12, 22 are made different from each other, and the pair of first and second locking pieces are similarly made. By making the lengths of the flexures 23 and 24 different from each other, the natural frequencies of the two pieces are made different from each other, so that when one receives a vibration corresponding to the natural frequency, the other cancels the resonance. . Accordingly, generation of abnormal noise due to resonance of the first and second locking pieces 12 and 22 or the first and second flexible pieces 23 and 24 can be reliably prevented.

[0034]

As described above, according to the lock structure of the resin molded product of the present invention, the rattling of the resin molded products joined to each other in the horizontal and vertical directions is suppressed, and the generation of abnormal noise is ensured. It is possible to prevent and prevent the resin molded products from being connected and separated from each other.

[Brief description of the drawings]

1A and 1B show a lock structure of a resin molded product according to an embodiment of the present invention, wherein FIG. 1A is a perspective view of a main part of one resin molded product, and FIG. FIG.

FIG. 2 is a plan view showing another resin molded product.

FIGS. 3 (a) and 3 (b) are cross-sectional views showing the state of separation and connection of the one resin molded product and another resin molded product.

FIG. 4 is a perspective view showing a lock structure of a conventional resin molded product, and FIG.
FIG. 1B shows one and other resin molded products in a connected state.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 One resin molded product 11 Rib 12 First locking piece 12A Notch 12a Contact surface 12b Front surface 20 Other resin molded product 20a Groove 21 Guide 21a Side wall 21b Upper wall 22 Second locking piece 22A Locking claw (projection Part) 22a contact surface 22b guide slope 23 first flexible piece 24 second flexible piece

Claims (2)

[Claims] 1. A lock structure for a resin molded product in which one resin molded product and another resin molded product are joined to each other by slide fitting of a rib and a guide, wherein a vertical direction integrally formed with the one resin molded product is provided. A first locking piece, which is a plate-like piece having a constant length having elastic force and extending in a direction opposite to a direction in which the one resin molded article is inserted into the other resin molded article, and the other resin molded article A plate-like piece having a length different from that of the first locking piece having elasticity in the vertical direction integrally formed with the first resin piece, extending in a direction of inserting the one resin molded article into the other resin molded article, When one and another resin molded product are slid and fitted, the second locking piece abutting on the first locking piece is different from the other resin molded product having a horizontal elastic force integrally formed with the other resin molded product. A pair of plate-like pieces having a length, which contacted the second locking piece. A lock structure for a resin molded product, comprising: first and second flexible pieces for pressing the first locking piece against the second locking piece. 2. The lock structure for a resin molded product according to claim 1, wherein the first locking piece has a notch, and the second locking piece has a protrusion that contacts an inner surface of the notch. .