JP3026715B2 - Structure for preventing deformation of resin molded products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a substantially U-shaped resin molded product having a pair of side walls integrally formed in the same direction from both sides of a bottom portion. The present invention relates to a deformation prevention structure.

[0002]

2. Description of the Related Art FIG. 4 shows a protector 1 (resin molded product) in which a wire harness is housed. The protector 1 includes a protector body 3 in which a wire harness is housed, and a lid 5 for closing an upper part of the protector body 3.
The protector main body 3 has a pair of side walls 9a and 9b integrally formed in the same direction from both sides of the bottom 7 and is formed in a substantially U-shape. The lid 5 has a flat plate shape, and both sides are bent in the same direction.
a and 13b are integrally formed. Each of the lock arms 11 is provided with a locking projection 15.

On the other hand, the side walls 9a, 9b of the protector body 3
Are respectively formed on the outer periphery of the. By inserting the lock arm 11 into a locking hole 19 surrounded by the locking frame 17 and the side walls 9a and 9b, and locking the upper end of the locking projection 15 to the lower end of the locking frame 17, The cover 5 is held by the protector body 3.

When the protector body 3 is injection-molded with a synthetic resin, the pair of side walls 9a and 9b fall inward due to shrinkage due to a decrease in temperature after molding, and the locking frame 17 and
17 becomes narrow. For this reason, a pair of lock arms 1
The distance between the locking holes 19, 19 becomes narrower than that between 1, 1 and 11, making it difficult for the lock arm 11 to be inserted into the locking hole 19, and the locking work is troublesome.

Therefore, a protector that prevents the side walls 9a and 9b from falling after molding has been proposed in Japanese Patent Application Laid-Open No. 64-72821. The protector shown in FIG.
The thickness of the connecting portion between the bottom 7 and the side wall 9 a is set to １ ／ of the thickness t of the bottom 7. The protector shown in FIG. 5B has a thickness t of the bottom 7 immediately before the side wall 9a.
Is set to の.

[0006]

However, even in the protector disclosed in the above publication, it was not possible to reliably prevent the side walls 9a and 9b from falling into the inside depending on molding conditions. For this reason, the applicant of the present invention
No. 41329, both side walls 9a, 9 as shown in FIG.
b, the side wall 9a, 9b
A protector 25 provided so as to be breakable between them is proposed.

However, in this protector 25,
When the wire harness is housed in the protector main body 3, it is necessary to break and remove the fall-in prevention member 23 from the protector main body 3, which increases the number of work steps and necessitates an unnecessary member (the fall-in prevention member 23). In addition, the structure of the mold for molding the protector 25 is complicated, and thus the production cost is high.

[0008] The applicant of the present invention discloses a technique disclosed in Japanese Utility Model Laid-Open No. Hei.
No. 9 proposes a protector 29 in which a substantially triangular falling prevention rib 27 is provided outside a continuous portion of a bottom 7 and a pair of side walls 9a and 9b as shown in FIG. In this protector 29, when the temperature decreases after molding, the triangular fall prevention rib 27 is formed by the side walls 9a, 9a.
By pulling b outward, the inward fall of the side walls 9a and 9b is reduced.

However, with this protector 29, it is possible to prevent the side walls 9a and 9b from falling down after molding, but when closing the upper part of the protector body 3 with the lid 5,
It is difficult to insert the lock arm 11 into the locking hole 19. That is, when the lock arm 11 of the lid 5 is inserted into the locking hole 19, the side walls 9 a and 9 b are pushed inward and fall down when positioning with holding both sides of the protector body 3,
Since the distance between the locking holes 19, 19 is smaller than that between the lock arms 11, 11, the lock arm 11 is
It is hard to insert into. For this reason, if it is attempted to insert the lock arm 11 of the lid 5 into the lock hole 19 without holding the protector body 3, there is no guide for positioning, and it is difficult to insert the lock arm 11 into the lock hole 19. Therefore, the present invention can reduce the collapse of the side wall in a substantially U-shaped resin molded product in which a pair of side walls are integrally formed in the same direction from both sides of the bottom wall, and can be attached to the locking portion of the other party. An object of the present invention is to provide a structure for preventing deformation of a resin molded product that can easily lock a lock portion.

[0010]

In order to achieve the above object, an invention according to claim 1 comprises a substantially U-shaped molded article body in which a pair of side walls are integrally formed in the same direction from both sides of a bottom wall. A locking portion provided at an end of the side wall and engaging with a locking portion of the other side. Further, a fall prevention rib for preventing the inward fall of the side wall is formed continuously and integrally.

According to a second aspect of the present invention, in the first aspect of the present invention, the fall-in prevention ribs are respectively protruded in a direction substantially perpendicular to the side wall and are provided substantially in parallel with a predetermined interval. It is characterized by comprising two plate-shaped portions.

According to a third aspect of the present invention, there is provided the resin molded product deformation preventing structure according to the first or second aspect, wherein the falling rib orbits around the bottom wall from the lock portion at one end of the side wall. And it is characterized in that it is formed integrally with the molded article main body continuously up to the lock portion at the end of the other side wall.

[0013]

According to the first aspect of the present invention, the fall prevention member is integrally formed on the side wall from the lock portion toward the bottom wall, so that after the resin molded article is molded, the inside of the side wall is contracted by the contraction of the fall prevention member. The fall of the vehicle is reduced. In other words, when the molten resin is injected into the mold, the mold portion forming the plate member is filled with the resin first, and the previously filled resin comes into contact with the surface of the mold. For this reason, the cooling starts from the portion where the plate member is formed. As a result, the shrinkage of the plate member portion due to cooling starts first, and the side wall portion where cooling starts later than the plate member portion is pulled outward, so that the inward fall of the side wall is reduced. When the locking portion is engaged with the locking portion of the other party, the portion where the falling-down preventing rib is formed is pushed from the bottom wall side, so that the falling-down preventing rib is aligned with the locking portion and the other party locking portion. As a guide, it can be easily engaged.

According to the second aspect of the present invention, the fall prevention rib is formed by the plate member erected in a direction substantially perpendicular to the side wall, so that the side wall can be prevented from falling inward after molding. In this case, by projecting the two plate members from the side wall substantially in parallel, a force that pulls the side wall outward when the plate member is contracted by cooling acts strongly, so that the amount of inward fall of the side wall is further reduced. Can be done.

According to the third aspect of the present invention, the fall prevention rib is formed continuously around the bottom wall from the lock portion at the end of one side wall to the lock portion at the end of the other side wall. Falling into the inside of the side wall can be further reduced. Further, when the lock portion is engaged with the locking portion of the other party, if the fall prevention rib which goes around the bottom wall is pressed,
The pressing force is transmitted to the falling prevention rib and directly applied to the lock portion, so that the lock portion can be easily engaged with the locking portion of the other party. Further, since the fall prevention rib is formed around the bottom wall from one side wall to the other side wall, the side walls and the bottom wall on both sides are reinforced.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a connector cover (resin molded product) 31 to which a resin molded product deformation preventing structure according to the present invention is applied will be described below. FIG. 1 is a perspective view showing the connector cover 31 and the connector block 33, and FIG.
(A), (b) is a side view which shows the connector cover 31 and the connector block 33. FIG. Connector cover 31
Is attached to the back side of the connector block 33 to which a plurality of connectors (not shown) are attached, accommodates the wires drawn from the rear end of the connector, and protects the rear end of the connector and the wires.

As shown in FIG. 1, the connector cover 31
A locking portion 45 that engages with a locking portion 43 of the connector block 33 is provided on a U-shaped cover main body 41 in which side walls 37 and 39 are integrally formed in the same direction from both sides of the bottom wall 35.
Are formed. Inside the U-shaped cover main body 41, a housing portion 47 for housing an electric wire drawn from the rear end of the connector of the connector block 33 is formed, and openings on both sides of the housing portion 47 are wire outlets 49, 49. It has become. Part of the wire outlets 49, 49 extends in the longitudinal direction of the bottom wall 35 to form wire fixing portions 65, 65. A plurality of electric wires accommodated in the accommodating portion 47 are bound and fixed to the electric wire fixing portions 65 by a tape or the like.

On one side of the bottom wall 35, a side wall 37 bent at a substantially right angle to the bottom wall 35 has a flat plate shape, and the opposite end of the bottom wall 35 is bent outward at a substantially right angle. A step portion 36 is formed which is bent again substantially in parallel with the other side wall 39. Lock portions 45, 45
Are formed.

The lock 45 includes an insertion plate 79 extending from the tip of the side wall 37 and a hook 81 formed outside the tip of the insertion plate 79. In the hook 81,
A slope 83 that is upwardly inclined is formed from the tip end toward the bottom wall 35 side. A fall prevention rib 53 is formed integrally with the side wall 37 from the lock portion 45 toward the bottom wall 35.

The fall-in prevention ribs 53 are formed of two plate-like portions 55, 55 projecting substantially at right angles to the side wall 37 and provided substantially in parallel at a predetermined interval. These plate-shaped portions 55, 55 are formed continuously from the stepped portion 36 on the bottom wall 35 side of the lock portion 45 to the inclined wall 51 connecting the side wall 37 and the bottom wall 35. The height of these plate-shaped portions 55 from the side wall 37 is equal to the height of the step portion 36, and the thickness thereof is set substantially equal to the thickness of the side wall 37.

On the other hand, on the other side of the bottom wall 35, the bottom wall 35
The side wall 39 bent substantially at right angles to the outside has a step portion 57 which is bent outward in the middle and then bent again substantially in parallel with one of the side walls 37, and further has a step extending outward at the front end thereof. A portion 58 is formed. Lock portions 59, 59 are formed on the distal end side of the step portion 58, similarly to the side wall 37. The lock portion 59 includes an insertion plate portion 79 and a hook portion 81, similarly to the lock 45 described above.
Is formed with a slope 83. The lock portions 59, 5
From the outer periphery of the side wall 39, a fall prevention rib 61 projecting in a direction substantially perpendicular to the side wall 39 is formed from 9 to the step portion 57.

The ribs 61 are shorter than the ribs 53 provided on the side wall 39, project in a direction substantially perpendicular to the side wall 39, and are provided substantially in parallel with a predetermined interval. Two plate-like portions 63, 63
Consists of These plate-like portions 63, 63 have a height from the side wall 39 equal to the height of the step portion 58 and a thickness of the side wall 39.
Is set to be approximately equal to the thickness.

The connector block 33 to which the connector cover 31 is attached on the rear side has a block-shaped main body 67 on which cylindrical connector mounting portions 69 for mounting connectors (not shown) are formed. . Also,
Locking portions 43, 43 are formed on the outer periphery of the main body 67. The locking portion 43 includes a flexible locking frame 73 having a U-shaped cross section protruding from the upper surface 67 a of the main body 67, and a locking hole formed in the inside surrounded by the locking frame 73. 75. As shown in FIGS. 2 (a) and 2 (b), the edge of the locking frame 73 is formed with an inclined surface 77 which is inclined upward. When the lock portions 45 and 59 are inserted into the locking holes 75, the slopes 83 and 77 slide to slide into the locking frame portions 73.
Is bent.

Next, a procedure for attaching the connector cover 31 to the rear end of the connector block 33 will be described. First, as shown in FIG. 2A, after the connector cover 31 is positioned on the back side of the connector block 33, the outer peripheral portion of the bottom wall 35 is pressed with a finger or the like, and the lock portion 4 is pressed.
5 and 59, the insertion plate 79 is inserted into the locking hole 75. When the insertion plate portion 79 is inserted into the locking hole 75, the inclined surface 83 slides on the inclined surface 77 to bend the locking frame portion 73, and the hook portion 81 passes through the locking hole 75. When the hook 81 is inserted into the locking hole 75, the hook 81 and the locking frame 73 are engaged, and the connector cover 31 is attached to the rear side of the connector block 33.

In the above operation, when the lock portions 45, 59 are to be inserted into the locking holes 75, the lock portions 45, 59 are formed on the extension of the fall prevention ribs 53, 61. Using the ribs 45 and 59 as a guide, the lock portions 45 and 59 can be easily positioned in the locking holes 75 of the locking portion 43. Also, the bottom wall 35
Is pressed, the pressing force is efficiently transmitted to the lock portions 45 and 59 by pressing the portions corresponding to the fall prevention ribs 53 and 61, and the lock portions 45 and 59 are inserted into the locking holes 75.
Can be easily inserted.

The connector cover 31 of this embodiment is
The inward falling of the side walls 37 and 39 after the injection molding with the resin is reduced by the falling prevention ribs 53 and 61. That is, when the molten resin is injected into the mold by integrally forming the fall prevention ribs 53 and 61 outside the side walls 37 and 39, the fall prevention rib 5 is formed.
The parts 3 and 61 are filled first and come into contact with the mold, and cooling starts first. For this reason, the ribs 5 prevent the ribs 5 from being cooled from the side walls where the cooling starts later than the ribs 53 and 61.
The side walls 3 and 61 contract first, so that the side wall 3 contracts later.
7, 39 are pulled outward, and as a result, the inward fall of the side walls 37, 39 is reduced. Further, the connector cover 31 according to the present embodiment includes the side walls 37 and 39.
Since the fall prevention ribs 53 and 61 are formed on the outer surface, the side walls 37 and 39 can be reinforced. Therefore, the thickness of the side walls 37 and 39 can be reduced, and the cost can be reduced.

Next, another embodiment shown in FIG. 3 will be described. The connector cover 85 according to the present embodiment goes around the bottom wall 35 from the lock portion 45 at the end of the side wall 37, and
A fall-preventing rib 87 extending to the lock portion 59 at the end of the end 9 is formed integrally with the side walls 37, 39 and the bottom wall 35.

By forming the falling-down prevention rib 87 in this way, it serves as a mark for the position of the lock portions 45, 59 and locks the pressing force when the lock portions 45, 59 are engaged with the locking portion 43. It can be efficiently transmitted to the parts 45 and 59. In addition, it is possible to reduce the inclination of the side walls 37 and 39 into the inside, and the mechanical strength of the side walls 37 and 39 is reinforced, so that the thickness of the side walls 37 and 39 can be reduced. In the above-described embodiment, the U-shaped connector cover 31 is described as a resin molded product. However, the deformation prevention structure of the resin molded product according to the present invention is also applied to a U-shaped protector, cover, and lid. I can do it. Further, the fall-prevention rib may be constituted by one plate-shaped portion or may be constituted by three or more plate-shaped portions.
It is preferable to form the plate-shaped portion in consideration of the shape and cost.

[0029]

As described above, according to the first aspect of the present invention, the fall prevention member is formed integrally with the side wall, so that after the resin molded article is formed, the inside of the side wall is shrunk by the contraction of the fall prevention member. Is reduced. Also, when the locking portion is engaged with the locking portion of the other party, the portion where the falling prevention rib is formed is pressed from the bottom wall side so that the falling prevention rib aligns the locking portion with the locking portion of the other party. Thus, the locking portion and the locking portion can be easily engaged with each other.

According to the second aspect of the present invention, the fall-in prevention rib is formed by the two plate members erected in a direction substantially perpendicular to the side wall, so that the side wall after molding is prevented from falling into the inside. You can do it.

According to the third aspect of the present invention, the fall prevention rib is formed continuously from the lock portion at the end of one side wall to the lock portion at the end portion of the other side wall. Falling into the inside of the side wall can be further reduced. Further, when the lock portion is engaged with the locking portion of the other party, if the fall prevention rib which goes around the bottom wall is pressed,
This pressing force is transmitted to the falling-down prevention rib and efficiently applied to the lock portion, so that the lock portion can be easily engaged with the locking portion of the other party. Furthermore, since the fall prevention rib is formed around the bottom wall from one side wall to the other side wall, the side walls and the bottom wall on both sides can be reinforced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a connector cover to which a deformation preventing structure for a resin molded product according to the present invention is applied, and a connector block to which the connector cover is attached.

FIGS. 2A and 2B show a connector cover to which a resin molded product deformation preventing structure according to the present invention is applied and a connector block to which the connector cover is attached, and FIG. 2A shows a state before the connector cover is attached to the connector block. FIG. 4B is a side view showing a state where the connector cover is attached to the connector block.

FIG. 3 is a perspective view showing a connector cover of another embodiment to which a deformation preventing structure for a resin molded product according to the present invention is applied, and a connector block to which the connector cover is attached.

FIG. 4 is a perspective view showing a conventional protector.

5A and 5B show a conventional protector, and FIG. 5A is a cross-sectional view showing a connecting portion between a side wall and a bottom wall in which the side wall is prevented from falling down,
(B) is sectional drawing which shows the connection part of the other side wall and the bottom wall which prevented the fall of the side wall.

FIG. 6 is a perspective view showing a conventional protector in which a fall prevention member is integrally formed between side walls.

FIG. 7 is a perspective view showing a conventional protector provided with a triangular falling prevention rib outside a connecting portion between a side wall and a bottom wall.

[Explanation of symbols]

 31, 85 Connector cover (resin molded product) 35 Bottom wall 37, 39 Side wall 41 Cover body 43 Locking part 45, 59 Lock part 53, 61 Fall-down prevention rib 55, 63 Plate part

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B29C 33/42 B29C 45/37 H02G 3/04

Claims (3)

(57) [Claims] 1. A substantially U-shaped molded product main body in which a pair of side walls are integrally formed in the same direction from both sides of a bottom wall, and is provided at an end of the side wall and engages with a locking portion of a counterpart. in deformation preventing structure of the resin molded article and a lock portion, the
A fall prevention rib for continuously preventing the inward fall of the side wall from the lock portion toward the bottom wall is integrally formed on an outer peripheral surface side of the side wall, wherein deformation prevention of a resin molded product is performed. Construction. 2. The two-piece structure according to claim 1, wherein said falling-in prevention ribs project in a direction substantially perpendicular to said side wall, and are provided substantially in parallel with a predetermined interval. A structure for preventing deformation of a resin molded product, comprising: 3. The structure for preventing deformation of a resin molded product according to claim 1 or 2, wherein the fall-down rib orbits around a bottom wall from a lock portion at an end of one side wall and an end of the other side wall. A structure for preventing deformation of a resin molded product, wherein the structure is formed integrally with the molded product main body continuously up to a lock portion of the portion.