JP3515097B2 - Car door mirror stay - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle door mirror stay made of a thermoplastic resin or a thermosetting resin, which is less likely to be deformed such as warped or bent. An automobile door mirror stay has at least two surfaces, and the angles formed by these surfaces are kept constant. The two surfaces are joined at the joint, and the joint may or may not be chamfered.

[0002]

2. Description of the Related Art Various molded articles are molded by an injection molding machine or a compression molding machine using a polymer material or a composite material having a polymer as a matrix (hereinafter, also simply referred to as a raw material). Many of these molded products have one or a plurality of sets of two surfaces joined to each other at a joint. These surfaces are composed of flat and / or curved surfaces. Then, during molding, deformation such as warpage or bending of the two surfaces joined together (hereinafter, also simply referred to as deformation) occurs, and the dimensions of the molded product often do not satisfy the standard.

The shape or the angle formed by the two surfaces joined together at the joint is determined by the shape or the angle formed by the surfaces of the mold cavity used in the injection molding machine or the compression molding machine. However, in reality, the molded product is warped or bent due to shrinkage or the like during molding of the raw material. That is, there is a difference between the shape of the molded product expected from the shape of the mold cavity and the actually molded molded product. Such changes are called warping and bending.

This state is shown in FIG. FIG. 26 is a schematic cross-sectional view of the molded product, and the two surfaces 10 and 12 are joined to each other at the joining portion 14. In FIG. 26, the broken line is the design cross-sectional shape of the molded product, and the solid line is the cross-sectional shape of the actually molded product. Due to the warpage and bending of the surface, the molded product deviates from the designed sectional shape.

Deformation is considered to be caused by cooling and solidification in the case of a thermoplastic resin and chemical change in the case of a thermosetting resin in the process of molding a raw material of a molded product. As measures against deformation, conventionally, the following (A) to (C) are shown.
Method was adopted. (A) A raw material having a small molding shrinkage in the molding process is selected. (B) During molding, the radius of curvature of the joint is increased so that the shrinkage stress and strain of the joint are reduced. (C) Ribs are provided on the molded product so as not to cause warping or bending.

However, the measure (A) may not be adopted for the following reasons. (A) In many cases, raw materials for molded products are required to have high elastic modulus and high strength. (B) From an economic point of view, it is often required to reduce the cost of raw materials. Further, in many cases, the deformations such as warpage and bending cannot be effectively reduced only by the measures (B) or (C).

[0007]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
Japanese Patent No. 11219 discloses a rotary polygon mirror used for an optical device having a laser scanning system. The rotary polygon mirror 10 includes a plurality of mirror surface portions 11, a boss portion 13,
It is composed of a plate-shaped portion 14 connecting the mirror surface portion and the boss portion, and a plurality of rib portions 15 extending vertically from the plate-shaped portion and connecting the mirror surface portion and the boss portion. This rotary polygon mirror is obtained by injection molding a resin material from a plurality of pinpoint gates 20. The plate-shaped portion 1 at the position where the mirror surface portion 11 and the rib portion 15 are joined
A hole portion 30 is provided in the portion 4.

The hole 30 is provided to eliminate the variation in the position of the weld line. That is, the purpose of providing the hole 30 is to mold the resin material that regulates the flow direction of the molten resin (melt front) injected from the pinpoint gate 20 and acts on the mirror surface portion 11 and the connecting portion 11A of the mirror surface portion 11. To control the pressure. By providing such a hole 30, even if the injection pressures from the adjacent pinpoint gates 20 are slightly different, the weld line can be positioned on the mirror surface portion 11, particularly on the joint portion 11A of each mirror surface portion 11. These hole portions 30 are not formed in the vicinity of the joint between the mirror surface portion 11 and the plate portion 14, and even if the hole portion 30 is formed, deformation of the mirror surface portion 11 and the plate portion 14 is prevented. Can not do it.

For example, Japanese Unexamined Patent Publication No. 64-11220 also discloses a rotary polygon mirror used in an optical device having a laser scanning system. The rotary polygon mirror 10 includes a plurality of mirror surface portions 11, a boss portion 13, a plate-shaped portion 14 that connects the mirror surface portion and the boss portion, a plate member that extends vertically from the plate-shaped portion, and connects the mirror surface portion and the boss portion. It is composed of a plurality of ribs 15.
This rotary polygon mirror is obtained by injection molding a resin material from a plurality of pinpoint gates 20.

The thickness of each mirror surface portion 11 gradually increases from the central portion to the end portion. Thus, by changing the thickness of the mirror surface portion, the molding pressure is uniformly applied to any position of the mirror surface portion. As a result, the surface accuracy of the mirror surface portion can be improved.

However, a thin portion is not formed in the vicinity of the joining portion between the mirror surface portion 11 and the plate portion 14, and even if the thickness of each mirror surface portion 11 is gradually reduced, the mirror surface portion 11 and the plate portion are not formed. It is not possible to prevent the deformation of No. 14.

Japanese Unexamined Patent Publication (Kokai) No. 3-159717 discloses an optical reflection mirror made of synthetic resin and having two intersecting planes. A reinforcing wall is provided to reinforce the corner formed by the two intersecting planes of the optical reflection mirror. This publication does not disclose that, in order to prevent the deformation of two intersecting planes, some treatment is performed on these planes themselves, for example, a treatment such as providing an opening in the plane or providing a thin portion in the plane. It has not been.

Japanese Utility Model Publication No. 2-41081 discloses a vehicle door mirror made of aluminum die cast. Retaining partition walls 6a, 60a formed on the base 20 of the vehicle door mirror are provided with locking holes 9, 9a, 9b, and the harness 5 is held by passing the harness 5 through the locking holes.

In this publication, a base 20 and a reinforcing partition 6 are provided.
No mention is made that an opening or a thin portion for preventing deformation is provided in the vicinity of the joint of a and 60a.

An object of the present invention is to provide a molded product which is less likely to be deformed such as warped or bent.

[0016]

A first aspect of the present invention for achieving the above object comprises a thermoplastic resin or a thermosetting resin, and has two surfaces joined to each other at a joining portion. Molded article, at least 1 near the joint
It is characterized in that an opening is formed on one surface.

Further, a second aspect of the present invention for achieving the above object is a molding comprising a thermoplastic resin or a thermosetting resin, and two ribs joined to each other at a joint and a rib. Which is at least 1 near the joint
An opening is formed in one of the faces and the rib is characterized in that it extends from the one face over the joint to the other face on the outside and / or the inside of the two faces.

In the first and second aspects of the present invention, the opening may be formed on at least one surface near the joint. That is, the opening may be provided on one surface near the joint or may extend from one surface to the joint, but according to a preferred embodiment, the opening is joined from one surface. It extends over the other side. The opening can be provided at one place or a plurality of places along the joint.

According to a more preferred embodiment of the first aspect of the present invention, the length of the opening along the joint is 0.1 times or more and 0.9 times or less, preferably the length of the joint. It is 0.3 times or more and 0.9 times or less, more preferably 0.5 times or more and 0.9 times or less. If it is less than 0.1 times, even if an opening is provided, there is little improvement against deformation, and if it exceeds 0.9 times, the bonding strength of the bonding portion may decrease.

According to a more preferred embodiment of the second aspect of the present invention, the length of the opening along the joint is 0.1 to 1 times the length of the joint, preferably 0.3. It is not less than 1 time and not more than 1 time, more preferably not less than 0.5 times and not more than 1 time. If it is less than 0.1 times, even if an opening is provided, there is little improvement against deformation. If the length of the opening along the joint is 1 times the length of the joint, the two faces are connected by a rib. The angle between the rib and the surface (rib inclination) is 3
It is preferable that the angle is 0 degrees or more and 90 degrees or less, and the thickness of the rib is 0.5 mm or more and 10 mm or less. If the angle formed by the rib and the surface (rib inclination) is less than 30 degrees, the effect of the rib to suppress deformation such as warpage or bending becomes small, and
The mold structure also becomes complicated. When the thickness of the rib is less than 0.5 mm, the effect of suppressing deformation by the rib becomes small, and when the thickness of the rib exceeds 10 mm, the molding cycle of the molded product becomes long.

A third aspect of the present invention for achieving the above object.
Is a molded article made of a thermoplastic resin or a thermosetting resin and having two surfaces joined to each other at the joint, wherein a thin portion is formed on at least one surface near the joint. It is characterized by being

Furthermore, a fourth aspect of the present invention for achieving the above object comprises a thermoplastic resin or a thermosetting resin, and two ribs bonded to each other at a bonding portion, and a rib. A molded article, wherein a thin portion is formed on at least one surface in the vicinity of the joint, and the rib is formed on one side of the two surfaces outside and / or on the other side beyond the joint. It is characterized by extending to the surface.

In the third and fourth aspects of the present invention, the thickness of the thin portion may be any thickness as long as it is less than the thickness of one surface, but is preferably 3/4 of the thickness of one surface. Or less, more preferably 2/3 or less. The minimum thickness of the thin portion may be a thickness that does not damage the thin portion when an external force is applied to the molded product.

In the third and fourth aspects of the present invention, the thin portion may be formed on at least one surface near the joint. That is, the thin portion may be provided on one surface in the vicinity of the joining portion or may extend from one surface to the joining portion, but according to a preferred embodiment, the thin portion is joined from one surface. It extends over the other side. The thin portion can be provided at one place or a plurality of places along the joint.

According to a more preferred embodiment of the third and fourth aspects of the present invention, the length of the thin portion along the joint is 0.1 times or more and 1 time or less, preferably the length of the joint. Is 0.3 times or more and 1 time or less, more preferably 0.5 times or more and 1 time or less. When ribs are formed, the length of the joint is the length obtained by subtracting the thickness of the rib from the total length of the joint. If it is less than 0.1 times, even if a thin portion is provided, there is little improvement in deformation. If ribs are formed,
The angle formed by the rib and the surface (rib inclination) is preferably 30 degrees or more and 90 degrees or less, and the thickness of the rib is preferably 0.5 mm or more and 10 mm or less. When the angle formed by the rib and the surface is less than 30 degrees, the effect of the rib for suppressing deformation such as warpage and bending becomes small, and the mold structure becomes complicated. When the thickness of the rib is less than 0.5 mm, the effect of suppressing deformation by the rib becomes small, and when the thickness of the rib exceeds 10 mm, the molding cycle of the molded product becomes long.

In the molded article of the present invention, the thickness of one surface and the other surface may be the same or different. The surface may be a flat surface or a curved surface. It is also possible to give the joint part a predetermined radius of curvature.

As the thermoplastic resin or thermosetting resin which can be used in the molded article of the present invention, any resin can be used as long as it can be molded by an injection molding machine or a compression molding machine. In particular, when a resin having a large shrinkage factor during molding is used, the deformation of the molded product can be effectively reduced.

A filler may be added to the thermoplastic resin or thermosetting resin used in the molded article of the present invention.
The shape of such a filler can be bead-like, fibrous, or flake-like, and the filler is the same as the filler used by being blended with a usual injection molding resin such as carbon or glass. can do. If desired, stabilizers, pigments, etc. can be added to these resins.

The molded article of the present invention is produced by various molding methods such as injection molding and compression molding using a thermoplastic resin or a thermosetting resin, or a thermoplastic resin or a thermosetting resin mixed with a filler. It can be molded.

The thermoplastic resin which can be used for the molded article of the present invention is not particularly limited and is exemplified by polyolefin resin, polystyrene resin, ABS resin, AS resin, PVC resin, methacrylic resin, fluorine-containing resin and the like. In addition to so-called general-purpose plastics, engineering plastics such as nylon resin, saturated polyester resin, polycarbonate resin, polyacrylate resin, polyacetal resin, polysulfone resin, and modified polyphenylene ether resin can be used.

The thermosetting resin that can be used for the molded article of the present invention is not particularly limited, and includes phenol resin, furan resin, xylene-formaldehyde resin, ketone.
Examples of the thermosetting resin include formaldehyde resin, urea resin, melamine resin, aniline resin, alkyd resin, unsaturated polyester resin, and epoxy resin.

Various conditions such as the processing conditions of the molded article of the present invention, that is, the amount of molten resin at the time of molding, temperature, pressure, etc., cooling time of the mold, etc. are determined by the type of resin used, the shape of the mold It is necessary to appropriately select and control depending on factors such as the above, and it cannot be uniquely determined.

Various parameters such as the shape, size, position or number of the openings or thin parts in the molded article of the present invention, and the shape, size, position or number of ribs provided as necessary cannot be uniquely determined. Can not. Various parameters can be appropriately changed depending on the shape and cross-sectional shape of the molded product and the raw materials used. Since various parameters change depending on conditions such as the shape and size of the molded product, the strength required for the molded product, the type of resin used, the presence or absence of additives to the resin, the molding shrinkage ratio of the raw material, etc. It is necessary to select various parameters suitable for the conditions. However, by appropriately selecting these various parameters, it is possible to extremely effectively reduce the occurrence of deformation such as warpage or bending in the molded product.

Therefore, it is possible to industrially manufacture molded products required to have extremely high dimensional specifications such as molded products such as automobile door mirror stays, automobile door glass holders, housings, IC boxes, and chassis of copying machines. it can.

The automotive door mirror stay of the present invention obtained by molding a thermoplastic resin is provided with two surfaces joined to each other at a joining portion and a rib, and is obtained by molding a thermoplastic resin for an automobile. In the door mirror stay, one surface constitutes a mirror mounting portion, the other surface constitutes a vehicle body mounting portion, an opening is formed in at least one surface in the vicinity of the joint portion, and the rib has two ribs. It is characterized in that it extends from one surface to the other surface on the outside and / or inside of the surface, beyond the joint.

In such a vehicle door mirror stay, the length of the opening along the joint is preferably 0.1 times or more and 1 time or less than the length of the joint. The angle formed by the rib and the surface (the inclination of the rib) is 30 degrees or more and 90 degrees or less, and the thickness of the rib is preferably 0.5 mm or more and 10 mm or less.

The automobile door glass holder of the present invention obtained by molding a thermoplastic resin comprises a bottom surface and two side surfaces joined to the bottom surface at the joint portion, where:
The two side surfaces are substantially parallel to each other and the vehicle door glass is arranged in a space defined by the bottom surface and the two side surfaces, and at least one of these surfaces in the vicinity of the joint.
It is characterized in that an opening is formed on one surface.

In such an automobile door glass holder, it is desirable that the opening extends from the bottom surface to the side surface beyond the joint. The length of the opening along the joint is preferably 0.1 times or more and 0.9 times or less the length of the joint.

Further, the box-shaped molded article of the present invention obtained by molding a thermoplastic resin comprises a bottom surface, a side surface, and a joint portion for joining the bottom surface and the side surface, and these surfaces in the vicinity of the joint portion. An opening is formed on at least one of the surfaces.

In such a box-shaped molded article, it is desirable that the opening extends from the bottom surface to the side surface beyond the joint. Also, on the outside and / or inside of the bottom and sides,
Ribs that extend from the bottom surface to the side surface beyond the joint may be formed. When the rib is not formed, the length of the opening along the joint is preferably 0.1 times or more and 0.9 times or less the length of the joint. When the rib is formed, the length of the opening along the joint is preferably 0.1 times or more and 1 time or less than the length of the joint.

The box-shaped molded article of the present invention obtained by molding a thermoplastic resin comprises a bottom surface, a side surface, and a joint portion for joining the bottom surface and the side surface, and these surfaces near the joint portion. A thin portion is formed on at least one of the surfaces.

In such a box-shaped molded article, it is desirable that the thin portion extends from the bottom surface to the side surface beyond the joint portion. Also, on the outside and / or inside of the bottom and sides,
Ribs that extend from the bottom surface to the side surface beyond the joint may be formed. It is desirable that the length of the thin portion along the joint is 0.1 to 1 times the length of the joint.

Here, the box-shaped molded product is, for example,
The housing, the IC box, or the chassis of the copying machine can be exemplified.

In the first and second aspects of the present invention,
By providing openings in the molded product, it is possible to reduce the parts that cause deformation such as warpage and bending, and reduce the difference in cooling of the raw materials inside and outside the two surfaces near the joint during molding. This makes it possible to reduce the occurrence of deformation in the molded product.

In the third and fourth aspects of the present invention,
By providing a thin part in the molded product, it is possible to reduce the parts that cause deformation such as warpage and bending, and reduce the difference in cooling of the raw material inside and outside the two surfaces near the joint during molding. This makes it possible to reduce the occurrence of deformation in the molded product.

[0046]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described based on the preferred embodiments with reference to the drawings.

An example of an embodiment relating to the first aspect of the molded article of the present invention is shown in FIGS. This molded article is provided with two surfaces 10 and 12 and one joint portion 14,
One opening 20 extends from one surface 10 across the joint 14 to the other surface 12. FIG. 1 is a perspective view of this molded product, FIG. 2 (A) is a front view, FIG. 2 (B) is a plan view, and FIG. 2 (C) is a left side view. Face 10 and face 1
The angle formed by 2 is about 120 degrees. FIG. 2D is a cross-sectional view showing the opening 20.

Another embodiment of the first aspect of the molded article of the present invention is shown in FIG. In this molded product, a part of which is cut away to show a cross section in FIG.
0, 12A: 10, 12B), and two joints 14A, 14B are further provided. Then, the two surfaces 10 and 12A are joined at the joining portion 14A and the two surfaces 1 and 12A are joined together.
0 and 12B are joined at the joint portion 14B. A plurality of openings 20 extend from one surface 10 beyond the joint 14A to the other surface 12A. In addition, the plurality of openings 20
From the one surface 10 beyond the joint 14B to the other surface 1
It extends to 2B.

In this molded product, a portion of which is cut away in FIG. 3B to show a cross section, three pairs of two surfaces (10, 12A:
10, 12B: 10, 12C), and further three joints 14A, 14B, 14C are provided. Then, the two surfaces 10 and 12A are joined at the joint portion 14A,
The two surfaces 10 and 12B are joined at the joining portion 14B, and the two surfaces 10 and 12C are joined at the joining portion 14C. A plurality of openings 20 extend from one surface 10 beyond the joint 14A to the other surface 12A. In addition, a plurality of openings 20 extend from one surface 10 beyond the joint 14B to the other surface 12B. In FIG. 3B, the surface 10 and the surface 12C are not provided with an opening, but an opening extending from one surface 10 beyond the joint 14C to the other surface 12C can be formed.

An example of an embodiment relating to the second aspect of the molded article of the present invention is shown in FIGS. 4 and 5. This molded article is provided with two surfaces 10 and 12 and one joint portion 14,
One opening 20 extends from one surface 10 across the joint 14 to the other surface 12. Also, the rib 24A is
On the inner side of the two faces 10, 12, it extends from one face 10 over the joint 14 to the other face 12. Further, the rib 24B extends on the outside of the two surfaces 10 and 12 from one surface 10 beyond the joint portion 14 to the other surface 12. FIG. 4 is a perspective view of this molded product, which is shown in FIG.
5 is a front view, FIG. 5B is a plan view, FIG. 5C is a left side view, and FIG. 5D is a cross section showing the opening 20.
The angle formed by the surfaces 10 and 12 is about 120 degrees. Rib 2
The angle formed by 4A and B with the surface 10 and the angle formed by the ribs 24A, B with the surface 12 are 90 degrees, respectively.

Another embodiment of the second aspect of the molded article of the present invention is shown in FIG. 6A and 6B show a cross section with a part cut away,
Except that A and 24B are formed, it is the same as the molded product shown in FIGS. 3A and 3B, and detailed description thereof is omitted. In FIG. 6, some of the outer ribs 24B are omitted for simplification of the drawing.

FIG. 7 is a schematic cross-sectional view showing the deformation of the openings relating to the first and second aspects of the molded product of the present invention. The opening 20 shown in FIG. 7A is formed in the vicinity of the joint 14 on the one surface 10. The opening 20 shown in FIG. 7B extends from the one surface 10 to the joint 14. In addition, as shown in FIG. 7C, if necessary,
The joint may be chamfered. That is, the joint may have a predetermined radius of curvature. The chamfer may be applied to either the outer surface or the inner surface of the joint.

An example of an embodiment relating to the third aspect of the molded article of the present invention is shown in FIGS. This molded article is provided with two surfaces 10 and 12 and one joint portion 14,
One thin portion 22 extends from one surface 10 across the joint 14 to the other surface 12. FIG. 8 is a perspective view of this molded product, FIG. 9 (A) is a front view, FIG. 9 (B) is a plan view, and FIG. 9 (C) is a left side view. FIG. 9 (D)
FIG. 6 is a sectional view showing a thin portion 22. The angle formed by the surfaces 10 and 12 is about 120 degrees.

Another embodiment of the third aspect of the molded article of the present invention is shown in FIG. 10 (A) and (B)
This molded product, whose cross section is shown by cutting out a part of it, shows a thin portion 22 in place of the opening, except that FIG.
Since it is the same as the molded product shown in (A) and (B), detailed description thereof will be omitted.

An example of an embodiment relating to the fourth aspect of the molded product of the present invention is shown in FIGS. 11 and 12. This molded product has 2
One surface 10, 12 and one joint 14 are provided, and one thin portion 22 is formed from one surface 10 to the joint 14
And extends to the other surface 12. Rib 24A is 2
On the inside of one surface 10, 12, it extends from one surface 10 over the joint 14 to the other surface 12. Further, the rib 24B is provided on the outer side of the two surfaces 10 and 12 and the one surface 1
It extends from 0 to the other surface 12 beyond the joint portion 14. FIG. 11 is a perspective view of this molded product, FIG. 12 (A) is a front view, FIG. 12 (B) is a plan view, and FIG. 12 (C) is a left side view. FIG. 12D shows the thin portion 2
It is sectional drawing which shows 2. The angle formed by the surfaces 10 and 12 is about 120 degrees. The angle between the ribs 24A and 24B and the surface 10 and the angle between the ribs 24A and 24B and the surface 12 are 90 degrees, respectively.

Another embodiment of the fourth aspect of the molded article of the present invention is shown in FIG. 13A and 13B
This molded product, whose cross section is shown by cutting out a part of
Except that 4A and 24B are formed, it is the same as the molded product shown in FIGS. 10A and 10B, and detailed description thereof is omitted.

FIG. 14 shows the third and fourth molded articles of the present invention.
FIG. 7 is a partial cross-sectional view showing the deformation of the thin portion relating to the above embodiment. Figure 1
The thin portion 22 shown in FIG. 4A is formed in the vicinity of the joint portion 14 on the one surface 10. The thin portion 22 shown in FIG. 14B extends from the one surface 10 to the joint portion 14. In FIGS. 14A and 14B, the thin portion 2
The outer surface of 2 coincides with the outer surface of face 10. Figure 1
4C, the inner surface of the thin portion 22 is the surface 1
It matches the inner surface of 0 and 12. In FIG. 14D, the inner and outer surfaces of the thin portion 22 are surfaces 10, 1
2 does not match the inner and outer surfaces of 2. If necessary, as shown in FIGS. 15A and 15B, the joint may be chamfered, or FIGS. 15B and 15C.
Alternatively, as shown in (D), the thin portion can be chamfered.

Example 1 The molded article according to the first aspect of the present invention was applied to an automobile door glass holder. Polyacetal resin (Mitsubishi Gas Chemical Co., Ltd., trade name: F20)
-03), the vertical cross-sectional shape is substantially U-shaped as shown in the perspective view of FIG. 16 (A), and has a structure for sandwiching and fixing a door glass (not shown) in the central portion 30. An automobile door glass holder was injection molded by a usual method.
This car door glass holder has two sets of two faces (1
0,12A: 10,12B) and two joints 14
It consists of A and 14B. In FIG. 16, reference numeral 32 is a drive unit connecting portion.

In the first embodiment, in order to prevent deformation such as warping or bending, one surface (bottom surface) 10 is crossed over the joints 14A, 14B and the other surface (side surface) 12A, 1 is formed.
The openings 20 extending to 2B are provided at a total of 6 places. The two side surfaces are substantially parallel to each other.

Regarding the external dimensions of the automobile door glass holder of Example 1, in the perspective view of FIG. 16 (A), the bottom surface 10 has a length of 100 mm and a depth of 14 mm, and the thickness of each surface is 3 mm. Further, in the front view of FIG. 16B, the maximum height of the side surface is 20 mm. Opening 20
In the front view of FIG. 16B, is provided at a position such that the central portion of the opening is 18 mm, 43 mm, and 55 mm from the left end, and the width of the opening is 12 mm. As shown in FIG. 16C, which is a cross-sectional view taken along line XVI-XVI of FIG. 16B, the bottom 10 of the opening is formed.
Has a width of 5 mm, and the side walls 12A and 12B have a height of 5 mm.

After molding, the inward warp of the U-shaped tip portion (longest portion) shown in FIG. 16C was 0.9 mm. That is, when the design distance between the inner surfaces of the U-shaped tip portions is L _D and the measured value is L ₀ , the warpage (ΔL = L _D −L ₀ )
Was 0.9 mm. In Example 1, the warp inward of the U-shaped tip portion was remarkably small, and it was easy to insert the glass into the automobile door glass holder.

Comparative Example 1 A molded article (automobile door glass holder) similar to that of Example 1 was prepared except that no opening was provided. External dimensions and the like are the same as those in the first embodiment. A perspective view of the molded product of Comparative Example 1 is shown in FIG. In Comparative Example 1, the warp inward of the tip portion of the U-shape (ΔL = L _D -
L ₀ ) was 3.5 mm. From the results of measuring the amount of warp, it is understood that the formation of the opening can significantly reduce the occurrence of warp in the molded product.

(Example 2) The molded article according to the first aspect of the present invention was applied to an IC box for automobiles. I for automobile
The C box is a housing used when an IC-mounted printed wiring board or the like is mounted on an automobile. Using a polyacetal resin (manufactured by Mitsubishi Gas Chemical Co., Inc., trade name: F20-03), an IC box for automobile, which is a box-shaped molded product shown in the perspective view of FIG. 18, is injection-molded by a usual method. did.

The external dimensions of the automobile IC box of the second embodiment will be described with reference to the perspective view of FIG. 18A. The left and right widths are 75 mm, the depth is 45 mm, the height is 60 mm, and the surface thickness is All are 3 mm. The automotive IC box has four side surfaces (a front surface 40, a left side surface 42, a back surface 44, and a right side surface 46) and a bottom surface 48. Note that FIG.
18B, line XVIII-XVII in FIG.
A partly cutaway view is shown along I.

In Example 2, in order to prevent warpage, a total of six openings 20 were provided as shown in the front view and side view of FIGS. 18 (C) and (D). That is, two sets of two surfaces (48,
40: 48,44), and their joints,
Two sets of openings 20 are provided, and two sets of two surfaces (48, 42: 48, 4) composed of left and right side surfaces and a bottom surface
6) and the joints thereof, one opening 20 is provided.

The positions of the openings 20 are set at equal intervals from the side surface, and all the six openings 20 have the same size. The width of the openings will be described with reference to the front view of FIG. Is 15 mm, the height is 15 mm, and the depth is 15 mm.

The amount of warp ΔL ₁ to the inside of the back surface 44 measured from the line connecting the end of the left side surface 42 and the end of the right side surface 46.
Was 0.9 mm. Also, the edge of the front surface 40 and the back surface 4
The inward warp amount ΔL ₂ of the left side surface 42 measured from a line connecting the end portion of No. ₄ was 0.4 mm.

(Comparative Example 2) A molded product similar to that of Example 2 was prepared except that no opening was provided. The amount of inward warpage of the molded product of Comparative Example 2 was ΔL ₁ of 2.8 mm and ΔL ₂ of 1.
It was 2 mm.

From the above measurement results of the warp amount, it is understood that the deformation of the molded product can be effectively prevented by providing the molded product with the opening. Up to now, the warp of the IC box for automobiles has been extremely large, and therefore, there have been many problems that it is difficult to mount components such as an IC-mounted printed wiring board inside the IC box. However, automotive ICs
Providing an opening on the surface of the box significantly reduces warpage of the automobile IC box. As a result, the work of mounting an IC-mounted printed wiring board or the like on the automobile IC box or mounting the automobile IC box on the automobile has become significantly easier.

Example 3 The molded article according to the first aspect of the present invention was applied to the chassis of a laser beam printer. Optical components (prism,
A reflector etc.) and a motor are provided. Using a resin composition (trade name: Iupilon GS2050 manufactured by Mitsubishi Gas Chemical Co., Inc.) obtained by mixing 50 parts by weight of a polycarbonate resin and 50 parts by weight of glass fiber, a part of (A) in FIG. 19 is used. A chassis, which is a box-shaped molded product shown in a cutaway perspective view, was injection-molded by a usual method.

The chassis of the third embodiment has a plurality of side surfaces and bottom surfaces 48 and 48A.
Two side surfaces 40 and 42 are shown in FIG. The side surface 40 has a length of 400 mm and a height of 60 mm. The length of the side surface 42 is 500 mm, and the height is 80 mm, 90 mm and 10 mm.
It is 0 mm. The bottom surface 48A is joined to the side surface 40 at a position where the height of the side surface 40 is 25 mm. Side 4
The thickness of 0, 42 and the bottom surfaces 48, 48A was 4 mm.
In FIG. 19, 49 is an optical component mounting portion.

In Example 3, the opening 20 extending from the bottom surface 48 to the side surface 42 is provided to prevent warpage. The width of the opening 20 is 20 mm, the depth of the opening 20 on the bottom surface 48 is 20 mm, and the opening 2 on the side surface 42.
The height of 0 was 20 mm. The opening 20 is separated from the opening 20 by 20 mm. Further, the opening 20 has a side surface 4.
It is 20 mm away from the intersection of 0 and the side surface 42.

The chassis is attached to the laser beam printer at sides 42 and bottom 48.
The chassis must be mounted so that the optical components mounted on the chassis can fully exhibit their characteristics, and that the chassis can be accurately and easily mounted in place on the housing of the laser beam printer. , High dimensional accuracy, smoothness and flatness are required. Many corners where two or three surfaces intersect are formed on the chassis. Warpage easily occurs at the corners.

The amount of warpage of the side surface 42 in the chassis shown in FIG. 19A was 0.2 mm inward.

(Comparative Example 3) A chassis similar to that of Example 3 was prepared except that no opening was provided. The amount of inward warpage of the molded product of Comparative Example 3 was 0.9 mm.

From the above measurement result of the warp amount, by providing an opening in the chassis which is a box-shaped molded product,
It can be seen that the deformation of the molded product can be effectively prevented. Up to now, there has been a problem that the warp of the chassis is so large that it is difficult to mount the optical parts or the like on the chassis or mount the chassis on the housing. However, when the opening is provided on the surface of the chassis, the warp of the chassis is significantly reduced. As a result, optical parts, motors, etc. can be easily and accurately attached to the chassis, and the optical parts exhibit their characteristics. Also, the work of attaching the chassis to the housing of the copying machine has become significantly easier.

Example 4 The molded article according to the second aspect of the present invention was applied to an automobile door mirror stay. Using a resin composition obtained by mixing 45 parts by weight of polymethaxylylene adipamide (manufactured by Mitsubishi Gas Chemical Co., Inc .: Rennie N252) and 55 parts by weight of glass fiber, injection molding is performed by a conventional method. Then, a molded product (automobile door mirror stay) was produced.

FIG. 20 shows an automobile door mirror stay of the fourth embodiment. 20A is a front view of the automobile door mirror stay of the fourth embodiment, FIG. 20B is a left side view, and FIG. 20C is a bottom view. In FIG. 20, 50 is an opening, 52 is an inner rib (thickness: 2 m
m), 54 is an outer rib (thickness: 2 mm), 56 is a mirror mounting portion (thickness: 3 mm) on one surface, 58 is a vehicle body mounting portion (thickness: 3 mm) on the other surface, and 60 is Mirror mounting bolt holes, 62 is a vehicle body mounting bolt hole, 6
Reference numeral 4 denotes a joint portion between the mirror mounting portion 56 which is one surface and the vehicle body mounting portion 58 which is the other surface, and 66 denotes the vehicle body mounting portion 58.
3 shows an outer rib provided on the.

As shown in the left side view of FIG. 20B, the surface of the mirror mounting portion 56 and the surface of the vehicle body mounting portion 58 are at an angle of 105 degrees (an angle corresponding to the cavity design value of the mold. The product is slightly deformed). As can be seen from the front view of FIG.
Is attached in a state of being inclined to the left side by 110 degrees with respect to the surface of the vehicle body mounting portion 58. That is, the angle formed by the rib and one surface (mirror mounting portion 56) is 80 degrees.

As shown in FIG. 20A, the height of the mirror mounting portion 56 is 80 mm at the longest part in the vertical direction of the drawing from the surface of the vehicle mounting portion 58, and the width of the vehicle mounting portion 58 is as shown in the drawing. 100mm in the left-right direction, 50mm in the shortest part
Is. As shown in FIG. 20C, the height of the pentagonal vehicle body mounting portion 58 is 80 mm and 40 mm in the vertical direction of the drawing, respectively.

The opening 50 is provided between the four inner ribs 52, and the size of the opening is 3 mm in the vertical direction of the drawing and 1 in the horizontal direction, as shown in FIG.
It is 0 mm. The opening 50 does not extend to the joint 64 and the vehicle body mounting portion 58.

The inner rib 52 is 5.75 mm from the left end of the vehicle body mounting portion 58, as shown in FIG.
15.75 mm, 25.75 mm, and 35.75 mm
20B has a central portion thereof, and as shown in FIG. 20B, the width of the inner rib 52 in the horizontal direction in the drawing is 25 mm,
The height of the right side is 30 mm.

Outer ribs 66 on the vehicle body mounting portion 58
As shown in FIG. 20 (C), eight are provided at regular intervals of 12 mm from a position 8 mm from the left end of the vehicle body mounting portion 58. As shown in FIG. 20B, the width of the outer rib 54 in the mirror mounting portion 56 in the left-right direction is 4 mm at the shortest portion and 6 mm at the longest portion, and the other three outer sides of the mirror mounting portion 56. The lateral width of the rib 54 has the same dimension.

The height of the outer rib 66 of the vehicle body mounting portion 58 is 6 mm. Some of the outer ribs 66 of the vehicle body mounting portion 58 and the outer ribs 54 of the mirror mounting portion 56 are integrated.

As shown in FIG. 20, the automobile door mirror stay has a shape in which two surfaces (the mirror mounting portion 56 and the vehicle body mounting portion 58) are joined at the joint portion 64, and many of them are mounted on the automobile door mirror stay. Parts are attached.
Therefore, the tolerance for deformation such as warpage or bending of the molded product is extremely small.

After the automobile door mirror stay was manufactured by the injection molding method, the warpage was measured. As shown in the left side view of FIG. 20B, the warp is centered on the joint portion,
It is represented by the angle formed by the vehicle body mounting portion 58 and the mirror mounting portion 56. The measurement result of this angle was 104.9 degrees with respect to the design value of 105 degrees.

(Comparative Example 4-A) An automobile door mirror stay similar to that shown in FIG. 20 is injected using the same resin composition as in Example 4, except that no opening is provided and no rib is provided at all. It was molded by the molding method. A front view of the automobile door mirror stay of Comparative Example 4-A is shown in FIG. 21 (A), a left side view is shown in FIG. 21 (B), and a bottom view is shown in FIG. 21 (C). When the warpage was measured in the same manner as in Example 4, it was 10
It was 3.9 degrees.

(Comparative Example 4-B) Using the same resin composition as used in Example 4, a molded product similar to Comparative Example 4-A was molded. However, at the time of molding, the radius of curvature (outer diameter) of the joint should be 10 m so that shrinkage stress and strain of the joint become small.
I made it as large as m. The warpage of the obtained molded product was measured in the same manner as in Example 4, and it was 104.1 degrees. That is, although the warp was improved as compared with Comparative Example 4-A, the warp was not improved as much as Example 4.

Comparative Example 4-C The same resin composition as in Example 4 was used, and an automobile door mirror stay similar to that shown in FIG. 20 was molded by the injection molding method except that no opening was provided. That is, it differs from Comparative Example 4-A in that ribs are formed. When the warp of the automobile door mirror stay of Comparative Example 4-C was measured, it was 104.4 degrees.
That is, although the warp was improved as compared with Comparative Example 4-B, the warp was not improved as much as Example 4.

From the above results, the shape accuracy of the automobile door mirror stay, which is a molded product to which the second aspect of the present invention is applied, is remarkably improved as compared with the conventional one, and the work of mounting parts such as a motor and a mirror can be performed. Significantly improved.

Example 5 The molded product according to the second aspect of the present invention was applied to a printer housing which is a box-shaped molded product. A molded article is injection molded by a usual method using a resin composition obtained by mixing 80 parts by weight of a polycarbonate resin (trade name: Iupilon GS2020, manufactured by Mitsubishi Gas Chemical Co., Inc.) and 20 parts by weight of glass fiber. did.

From the bottom of this printer housing 3 /
A cross-sectional view at the height of 4 is shown in FIG. The length of the first surface 70 of the printer housing is 800 mm, the second
The length of the surface 72 and the fourth surface 76 is 400 mm, the length of the third surface 74 is 660 mm, and the thickness of each surface is 6 mm.
The height of each surface was 70 mm. 70 mm × 50 mm L-shaped dents were provided at the corners of the second surface 72 and the third surface 74 and the corners of the fourth surface 76 and the third surface 74.

Further, as shown in a perspective view of a part of the molded product in FIG. 22B, an inner rib 24A and an outer rib 24 are formed.
A rib (thickness 2 mm) in which B is integrated was provided. That is, ribs are provided on the outside and inside of each side surface 70, 72, 74, 76 and bottom surface 78. The rib is (C) in FIG.
In the drawing, the angle of the lower left portion of the outer rib 24B is a right angle, and the height of the left side is 30.
mm, bottom 40 mm, top 20 mm, right side height 8
mm, and the length of the horizontal portion at the right end is 14 mm.

Openings 20 are formed between the ribs. The opening 20 extends from one surface (bottom surface 78) to the other surface (each of the first, second, third, and fourth side surfaces). The opening 2 shown by a broken line in FIG. 22C for convenience.
The height of 0 is 20 mm and the width is 18 mm.

There are 39 ribs on the first surface, and the second and fourth ribs.
19 on the surface and 19 on the third surface, which are provided at equal intervals.

The maximum distance between the upper end portion of the third surface of the molded product and the line connecting the upper end portion and the upper end portion of the third surface was measured and defined as the amount of warpage. The amount of warpage was 2.0 mm inward.

Comparative Example 5-A The same printer housing as in Example 5 was prepared by injection molding except that the same resin composition as that used in Example 5 was used and no openings and ribs were provided. Molded (see perspective view in FIG. 23). The warp amount of this molded product was 4.5 mm inward.

(Comparative Example 5-B) Using the same resin composition as used in Example 5, a molded article similar to Comparative Example 5-A was molded. However, at the time of molding, the joint part (first, second, third
And the radius of curvature (outer diameter) of the joint so that the shrinkage stress and strain of each of the fourth surface and the bottom surface) are reduced.
Was increased to 10 mm. The warpage of the obtained molded product was measured in the same manner as in Example 5. As a result, the amount of warpage was 4.0 mm inward.

Comparative Example 5-C A resin composition similar to that used in Example 5 was used, except that no opening was provided.
The same printer housing as in Example 5 was molded by the injection molding method. That is, in Comparative Example 5-C, ribs similar to those of Example 5 are provided on the outer side and the inner side of each surface. The warp amount of this molded product was 3.5 mm inward.

The printer housing is a box-shaped molded product, and warpage is a serious problem. Also, since many parts are mounted on the printer housing, the allowable range for deformation such as warping or bending of the printer housing is extremely small. According to the second aspect of the present invention, the deformation can be significantly reduced by providing the openings and the ribs. For this reason, the shape accuracy of the printer housing is remarkably improved as compared with the conventional one, and the work of mounting the motor, the gear, the IC-mounted printed wiring board and the like has been remarkably facilitated.

(Example 6) The molded product according to the third aspect of the present invention was applied to an IC box for machine tools, which is a box-shaped molded product. This IC box has a box shape as shown in the perspective view of FIG. 24 (A), and accommodates an IC-mounted printed wiring board and various wirings inside.

Using polypropylene (Mitsubishi Yuka Co., Ltd., trade name: Mitsubishi Noblen MA3), as shown in the perspective view of FIG. 24 (A), width 120 mm, depth 30 mm, height 50 mm, An IC box for machine tools in which the thickness of each surface (excluding thin portions) was 4 mm was injection-molded by a usual method. Line XXIV-X in FIG.
A sectional view taken along the line XIV is shown in FIG. The machine tool IC box has a bottom surface 88 and four side surfaces 80, 8
It consists of 2,84,86. In FIG. 24, 80 is the front, 82
And 86 are side surfaces, 84 is a back surface, and 88 is a bottom surface.

One surface (bottom surface 88) and the other surface (front surface 8)
0), and one surface (bottom surface 80) and the other surface (back surface 8)
Two thin portions 22 (see FIG. 24 (B)) were provided at the joining portions to be joined in 4). The thin portion 22 has its center located 32 mm and 86 mm from the left end of the front surface 80. The thin portion 22 can be obtained by forming a recess inside each surface. Set the width of the recess of the thin portion 22 to 4
The depth was 0 mm, the depth was 8 mm, and the height was 8 mm. The thin portion 22 has a thickness of 1.5 mm. For example, the outer surface of the front surface 80 and the outer surface of the thin portion formed on the front surface 80 are in the same plane.

The maximum distance between the upper end portion of the rear surface 84 of the box-shaped molded product (IC box for machine tool) and the line connecting the upper end portion of the rear surface 84 and the upper end portion is measured to determine the warpage amount. did. The amount of warp was 1.2 mm inward.

(Comparative Example 6) Except that a thin portion is not provided,
An IC box for machine tool similar to that in Example 6 was produced.
The dimensions of this IC box for machine tools were the same as in Example 6. The amount of warpage of the molded product thus obtained is 3.0 m
It was m.

In an IC box for machine tools, which is a conventional box-shaped molded article, front, back, and side surfaces warp inward, and when mounting an IC-mounted printed wiring board or various wirings, The work becomes complicated. In the molded product of the present invention, the warp of the molded product is reduced, and the work of mounting the IC-mounted printed wiring board and various wirings is facilitated.

Example 7 The molded product according to the fourth aspect of the present invention was applied to a printer housing which is a box-shaped molded product. A molded article is injected by a usual method using a resin composition obtained by mixing 80 parts by weight of a polycarbonate resin (trade name: Iupilon GS2020, manufactured by Mitsubishi Gas Chemical Co., Inc.) and 20 parts by weight of glass fiber. Molded. The dimensions of the printer housing of Example 7 were the same as those of Example 5 (see FIG. 22 (A)). Further, the same ribs as in Example 5 were provided on the molded product (see (C) of FIG. 22). 12 ribs on the first side, 10 ribs on the second and fourth sides,
Eight pieces are provided on the third surface at equal intervals. The thickness of each surface was 6 mm.

As shown in the perspective view of a part of the molded product in FIG. 25A, a thin portion 22 was provided between the ribs. As can be seen in the cross-sectional view of FIG. 25B, the thin portion has a height of 20 mm and a width of 30 mm. The thin portion 22 includes one surface (bottom surface 78) to the other surface (first, second, third).
And each of the fourth sides). Thin part 22
Can be obtained by forming a recess inside each surface. The thin portion 22 has a thickness of 2.0 mm. For example, the outer surface of the first surface and the outer surface of the thin portion provided on the first surface are in the same plane.

The amount of warpage was measured by measuring the maximum distance between the upper end of the third surface of the box-shaped molded product (printer housing) and the line connecting the upper end of the third surface and the upper end. And The amount of warpage was 1.2 mm inward.

(Comparative Example 7-A) A molded product (printer housing) similar to that of Example 7 was used, except that the same resin composition as that used in Example 7 was used and no thin portions and ribs were provided. Molded (see perspective view in FIG. 23). The dimensions of the molded product are the same as in Example 7. The warp amount of this molded product was 5.5 mm inward.

(Comparative Example 7-B) Using the same resin composition as that used in Example 7, a molded article similar to Comparative Example 7-A was molded. However, at the time of molding, the joint part (first, second, third
Also, the radius of curvature (outer diameter) of the joint was increased to 10 mm so that the shrinkage stress and strain of the joint between each of the fourth side surfaces and the bottom surface) became small. The warpage of the obtained molded product was measured in the same manner as in Example 7. As a result, the amount of warpage was 3.5 mm inward.

(Comparative Example 7-C) A resin composition similar to that used in Example 7 was used, except that no opening was provided.
The same printer housing as in Example 7 was molded by the injection molding method. That is, in Comparative Example 7-C, ribs similar to those in Example 7 are provided on the outer side and the inner side of each surface. The amount of warpage of this molded product was 3.1 mm inward.
As described above, even when the molded product according to the fourth aspect of the present invention is applied to the printer housing that is a box-shaped molded product, the warp is greatly reduced.

Although the molded article of the present invention has been described based on the preferred embodiments, the present invention is not limited to these embodiments.

The molded product is not limited to the molded product described in the embodiment, but may be any product. Raw materials to be used, shapes and dimensions of molded products, shapes of openings and thin parts, dimensions and positions, shapes of ribs, dimensions and positions, etc.
Various conditions can be appropriately changed depending on various performances, specifications, etc. required for the molded product.

The thickness of the two surfaces may be the same or different. The surface is not limited to a flat surface, and may have any curved surface or unevenness. The configuration of the surface is also arbitrary, and for example, it may be a honeycomb shape. When the thin portion extends from one surface to the other surface beyond the joint portion, the thickness of the thin portion on one surface and the thickness of the thin portion on the other surface may be the same or different.

[0116]

EFFECTS OF THE INVENTION In the molded product according to each aspect of the present invention, the deformation such as warpage and bending can be significantly reduced as compared with the conventional molded product. In the molded product according to each aspect of the present invention, the warp of the molded product can be significantly reduced even if a raw material having a large change in state quantity at the time of molding (raw material having a large molding shrinkage ratio) is used. Therefore, various molded products that require high dimensional accuracy can be provided at low cost in various industrial fields.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of an embodiment relating to a first aspect of a molded article of the present invention.

FIG. 2 is a diagram showing an example of an embodiment relating to a first aspect of the molded article of the present invention.

FIG. 3 is a diagram showing an example of an embodiment relating to the first aspect of the molded article of the present invention.

FIG. 4 is a diagram showing an example of an embodiment relating to a second aspect of the molded article of the present invention.

FIG. 5 is a diagram showing an example of an embodiment relating to a second aspect of the molded article of the present invention.

FIG. 6 is a diagram showing an example of an embodiment relating to a second aspect of the molded article of the present invention.

FIG. 7 is a diagram showing a modification of the first and second embodiment examples of the molded product of the present invention.

FIG. 8 is a diagram showing an example of an embodiment relating to a third aspect of the molded article of the present invention.

FIG. 9 is a diagram showing an example of an embodiment relating to a third aspect of the molded article of the present invention.

FIG. 10 is a diagram showing an example of an embodiment relating to a third aspect of the molded article of the present invention.

FIG. 11 is a diagram showing an example of an embodiment relating to a fourth aspect of the molded article of the present invention.

FIG. 12 is a diagram showing an example of an embodiment relating to a fourth aspect of the molded article of the present invention.

FIG. 13 is a diagram showing an example of an embodiment relating to a fourth aspect of the molded article of the present invention.

FIG. 14 shows a modification of the third and fourth embodiment examples of the molded article of the present invention.

FIG. 15 shows a modification of the third and fourth example embodiments of the molded article of the present invention.

FIG. 16 is a view showing an example in which the molded product according to the first aspect of the present invention is applied to an automobile door glass holder.

17 is a perspective view of a molded product (vehicle door glass holder) of Comparative Example 1. FIG.

FIG. 18 is a diagram showing an example in which the molded product according to the first aspect of the present invention is applied to a box-shaped molded product (IC box for automobile).

FIG. 19 is a diagram showing an example in which the molded product according to the first aspect of the present invention is applied to a box-shaped molded product (chassis of a copying machine).

FIG. 20 is a diagram showing an example in which the molded product according to the first aspect of the present invention is applied to an automobile door mirror stay.

FIG. 21 is a view showing a molded product (automobile door mirror stay) of Comparative Example 4-A.

FIG. 22 is a diagram showing an example in which the molded product according to the second aspect of the present invention is applied to a box-shaped molded product (printer housing).

FIG. 23 is a view showing a molded product (printer housing) of Comparative Example 5-A.

FIG. 24 is a diagram showing an example in which the molded product according to the third aspect of the present invention is applied to a box-shaped molded product (IC box for machine tool).

FIG. 25 is a view showing an example in which the molded product according to the fourth aspect of the present invention is applied to a box-shaped molded product (printer housing).

FIG. 26 is a schematic view showing a deformed state of a molded product.

[Explanation of symbols]

10, 12, 12A, 12B, 12C surface 14,14A, 14B, 14C Joint 20 openings 22 Thin section 24 ribs 30 Car Door Glass Holder Center 32 Drive unit connection 40 front 42 Left side 44 back 46 Right side 48 Bottom 50 openings 52 Inner rib 54 outer ribs 56 Mirror mount 58 Body mounting section 60 Mirror mounting bolt holes 62 Bolt holes for vehicle body mounting 64 joint 66 Outer ribs provided on the vehicle body mounting portion 58 70 First side 72 Second side 74 Third Side 76 Fourth Side 78 Bottom 80 front 82 side 84 back 86 side 88 bottom

─────────────────────────────────────────────────── ─── Continuation of front page (31) Priority claim number Japanese Patent Application No. 3-354612 (32) Priority date December 19, 1991 (December 19, 1991) (33) Priority claim country Japan (JP) (72) Inventor Yoshihiro Chino 5-6 Higashi-Hachiman, Hiratsuka-shi, Kanagawa Mitsubishi Engineering Plastics Co., Ltd. Technical Center (72) Inventor Yuko Itagaki 5-6 Higashi-Hachiman, Hiratsuka-shi, Kanagawa Mitsubishi Engineering Plastics Incorporated company technology center (72) Inventor Ryoji Uji, 80, Itado, Isehara-shi, Kanagawa Ichikoh Industries, Ltd., Isehara Factory (56) Reference JP-A-60-209341 (JP, A) (JP, U) Actually open 63-189838 (JP, U) Actually open 63-104234 (JP, U) Actually open 59-19447 (JP, U) (58) Field (Int.Cl. ^7, DB name) B60R 1/06 - 1/078

Claims (3)

(57) [Claims] 1. An automobile door mirror stay, comprising two surfaces joined to each other at a joining portion and a rib, obtained by molding a thermoplastic resin, wherein one surface constitutes a mirror attachment portion. However, the other surface constitutes a vehicle body mounting part, and when the door mirror stay for an automobile is molded, two parts near the joint part are formed.
The difference in the cooling of the raw material inside and outside the plane of
By reducing the parts that cause deformation, automotive door mirrors
One side to reduce the occurrence of deformation in the tape
And at the intersection of the other surface and between the ribs.
From the intersection to be placed on at least one surface near it.
Ri opening is formed, the ribs, two faces of the outer and / or on the inside, automotive door mirror stay, characterized in that extending into the other side beyond the joint from one side . 2. The door mirror stay for an automobile according to claim 1, wherein a length of the opening formed at the intersection along the joint is equal to a distance between the ribs . 3. A motor vehicle door mirror stay according to claim 1 or claim 2, wherein the thickness of the ribs is 0.5mm or more 10mm or less.