JP2002216571A - Resin molded product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to prevent grease from oozing from a switch knob in a power window switch and the like. SOLUTION: The switch knob 3 comprises a first molded resin product 21 having a projection 25 on the surface, and a second molded resin product 23 insert molded with a thermal shrinkage rate different from that of the first molded product covering the surface and periphery of the first mold 21, wherein the projection 25 on the first molded product 21 is exposed on the surface of the second molded product 23. On the surface of the first molded product 21, a projecting streak 33 is formed on the periphery of the projection 25 in circle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin molded product applied to a power window switch and the like provided in a passenger compartment of an automobile.

[0002]

2. Description of the Related Art A conventional resin molded product of this type is disclosed in, for example, Japanese Patent Application Laid-Open No. 9-265854, FIG.
There is a power window switch of an automobile shown in FIG.

[0003] As shown in FIG.
01 is a plurality of switch knobs 10
3, 105, 107, 109, 111, and 113 are supported so as to be freely pressed. The one knob 103 will be further described. The cross section is as shown in FIG. That is, the case 102 is provided with the cylindrical portion 115 protruding therefrom. A leaf spring 117 is supported on the outer surface of the cylindrical portion 115. A lock pin 119 is supported at the lower end of the leaf spring 117. The lock pin 119 is supported on the lower side of the cylindrical portion 115 so as to be slidable in the horizontal direction. The tip of the lock pin 119 protrudes into the cylindrical portion 115.

[0004] The switch knob 103 is a resin molded product, and comprises a primary molded product 121 and a secondary molded product 123. The primary molded article 121 has a convex portion 125 on the surface. The convex portion 125 displays a mark of the switch knob 103 on the surface of the secondary molded product 123. The primary molded article is molded of, for example, polyacetal as a hard resin. The secondary molded article 123 is molded with an ABS resin or the like as a heat-resistant resin. The secondary molded product 123 covers the surface and the peripheral surface of the primary molded product 121 by insert molding. An operating rod 127 is provided at a lower portion of the primary molded product. The operating rod portion 127 is movably supported on the inner surface side of the tubular portion 115 of the switch case 101. The operation rod portion 127 is provided with a heart cam as a part of a switch mechanism portion, with which the lock pin 119 contacts.

[0005] A return spring 129 is interposed between the switch knob 103 and the switch case 101. Return spring 129 is switch knob 1
03 is biased upward.

Therefore, the type of the switch knob 103 can be known by checking the mark displayed on the convex portion 125. When the switch knob 103 is pressed,
The switch knob 103 moves down against the coil spring 129. At this time, the lock pin 119 operates in accordance with the heart cam, and the switch knob can be held in a pressed state by the heart cam and the lock pin 119 at the lower position of the first step of the switch knob 103. Thereby, the contact can be operated via the operating rod 127.

When the switch knob 103 is further pushed into the second stage position, the lock pin 119 is released from engagement with the heart cam, and the switch knob 103 is restored to the original raised position by the urging force of the coil spring 129.

Such a heart cam and lock pin 11
For smoothing the function of No. 9, the heart cam is previously coated with, for example, grease as a lubricant. Therefore, the operation of the switch knob 103 can be performed smoothly.

[0009]

However, in the above structure, the grease inside the switch knob 103 may ooze out from the boundary surface between the upper surface of the switch knob 103 and the secondary molded article 123 around the projection 125. was there. This mechanism will be described.

The grease applied to the heart cam is applied to the operating rod 127 before the switch knob 103 is mounted on the switch case 101. When mounting the grease-applied switch knob 103 on the switch case 101, the grease-applied operating rod 127 is inserted into the inner surface of the cylindrical portion 115 from above to below in FIG. At this time, the grease applied to the heart cam may be scraped off at the upper end of the cylinder 115 and a predetermined amount 131 may remain on the upper surface of the cylinder 115. When the predetermined amount of grease 131 remains in this manner, when the switch knob 103 is pressed and the inner ceiling surface 133 of the switch knob 103 comes into contact with the upper stage of the cylindrical portion 115, the predetermined amount of grease is removed as shown in FIG.
Thus, the switch knob 103 is attached to the inner ceiling surface 133 side as shown in FIG.

On the other hand, the primary molded product 1 of the switch knob 103
Reference numeral 21 denotes a molding made of a hard resin such as polyacetal as described above, and a secondary molded product 123 is formed of a heat-resistant ABS resin or the like. This is because a heart cam is formed on the side of the primary molded product 121 to improve its durability. In addition, the secondary molded article 123 may be exposed to high heat due to sunlight or the like in a closed vehicle interior, so that heat resistance is improved and appearance quality is maintained.

[0012] Such a switch knob 103 is first
The next molded product 121 is molded, and then, the portion of the secondary molded product 123 is molded by insert molding, and is formed as the switch knob 103. Therefore, the primary molded article 121 and the secondary molded article 123 have different shrinkage rates due to the difference in the material as described above. For example, primary molded product 1
The contraction rate of the secondary molded article 123 is 1
It is smaller than the next molded article 121. As a result, as shown in FIG. 12, a minute gap 135 is generated in the portion A of FIG. 11 or the like by insert molding.

When a gap is formed between the primary molded article 121 and the secondary molded article 123, the grease 1 adhered to the inner ceiling surface 133 of the switch knob 103 as shown in FIG.
31 moves through the gap 135 as shown in FIG. 12 by capillary action, and reaches the convex portion 125 side. Therefore, the protrusion 12
There was a possibility that grease would seep out from the boundary surface with the secondary molded article 123 around No. 5.

The presence of grease oozing on the surface of the switch knob 103 has to be avoided due to the nature of the switch knob 103 being disposed on an armrest or the like in a vehicle compartment, and improvement thereof has been desired.

An object of the present invention is to provide a resin molded product which can prevent bleeding of grease and the like.

[0016]

A first aspect of the present invention is a secondary molded article of a resin having a projection on a surface and a resin covering the surface and the peripheral surface of the primary molded article by insert molding. In a resin molded product, wherein the projection of the primary molded product is exposed on the surface of the secondary molded product, a convex or concave ridge is formed on the surface of the primary molded product. Is formed in a circular shape on the outer peripheral side.

According to a second aspect of the present invention, there is provided the resin molded product according to the first aspect, wherein the primary molded product is formed such that a part of a switch mechanism is formed and is movably supported by a switch case. A first molded product, wherein the protrusion of the primary molded product displays a switch knob mark on a surface of the secondary molded product, and the secondary molded product forms an outer surface covering a mechanism of the switch; It is characterized by doing.

According to a third aspect of the present invention, there is provided the resin molded product according to the first or second aspect, wherein the resin of the secondary molded product is the same as that of the first molded product.
It is characterized in that the heat shrinkage differs from the resin of the next molded product.

According to a fourth aspect of the present invention, there is provided the resin molded product according to the third aspect, wherein the primary molded product is formed of a hard resin, and the secondary molded product is formed of a heat resistant resin. It is characterized by the following.

[0020]

According to the first aspect of the present invention, a primary molded product of a resin having a convex portion on the surface and a secondary molded product of a resin covering the surface and the peripheral surface of the primary molded product by insert molding are provided. In a resin molded product in which a convex portion of the primary molded product is exposed on a surface of the secondary molded product, a convex or concave ridge is formed on the surface of the primary molded product on an outer peripheral side of the convex portion. When the secondary molded article is formed on the primary molded article by insert molding, the resin of the secondary molded article covers the periphery of the convex ridge or enters the concave ridge. Therefore, the gap formed between the primary molded product and the secondary molded product has a longer path due to the presence of the ridges or the ridges, and the sealing performance can be improved. Therefore, movement of grease or the like between the primary molded product and the secondary molded product can be suppressed, and the grease or the like spreads around the convex portion of the primary molded product exposed on the surface of the secondary molded product. Outgoing can be suppressed.

According to a second aspect of the present invention, in addition to the effects of the first aspect, the primary molded product has an operating rod portion formed with a part of a switch mechanism and movably supported by a switch case. And the protrusion of the primary molded product is
A switch knob mark is displayed on the surface of the next molded product, and the secondary molded product covers the switch mechanism and forms an outer surface, so that the type of the switch knob can be easily known by checking the mark. Bleeding of grease and the like from around the mark can be suppressed.

According to the third aspect of the present invention, in addition to the effects of the first or second aspect, the resin of the secondary molded product has a different heat shrinkage from the resin of the primary molded product. Adhesion of the secondary molded product to the wall surface of the ridge or the ridge can be enhanced. Therefore, a gap is formed between the primary molded article and the secondary molded article due to the difference in the thermal shrinkage between the primary molded article and the secondary molded article, and even if grease moves through the gap due to the capillary phenomenon. The movement of the grease or the like can be blocked by the close contact of the secondary molded product with the wall surface of the ridge or the concave ridge, and the bleeding of the grease or the like from the periphery of the ridge can be more reliably prevented.

According to the fourth aspect of the present invention, in addition to the effect of the third aspect of the present invention, the primary molded article is formed of a hard resin, and the secondary molded article is formed of a heat-resistant resin. Due to the difference, the above-described effect can be reliably achieved, and the durability of a part of the mechanism of the switch formed in the primary molded product can be improved. Further, even when the secondary molded product is exposed to high heat, the appearance quality of the secondary molded product can be maintained.

[0024]

FIG. 1 is a sectional view showing a part of a power window switch of an automobile to which an embodiment of the present invention is applied, and corresponds to FIG. FIG. 2 is a partially omitted sectional view taken along the line SA-SA in FIG. 1. As shown in FIGS. 1 and 2, the power window switch 1 according to one embodiment of the present invention also includes a case 2, a switch knob 3, a cylindrical portion 15, a leaf spring 17, a lock pin 19, and a coil spring 29. .

The switch knob 3 comprises a primary molded product 21 and a secondary molded product 23 having a convex portion 25 and an operating rod 27. The operating rod 27 of the primary molded article 21 is provided with a heart cam 31 on which the lock pin 19 slides relatively.

On the other hand, in one embodiment of the present invention, as shown in FIGS.
Is provided. The ridge 33 is formed in a circular shape on the outer peripheral side of the ridge 25. The convex portion 25 of the primary molded product 21 displays the mark M of the switch knob 3 on the surface of the secondary molded product 23. The secondary molded product 23 has an outer surface that covers the heart cam 31 and the like that are the mechanism of the switch.

The primary molded product 21 is formed of a hard resin, for example, polyacetal, and the secondary molded product 23 is formed of a heat-resistant resin, for example, an ABS resin. Therefore,
The resin of the secondary molded product 23 has a different heat shrinkage from the resin of the primary molded product 21.

In molding the switch knob 3, first, a primary molded article 21 is formed of polyacetal.
Thereafter, a secondary molded product 23 made of ABS resin is formed by insert molding so as to cover the surface and the peripheral surface of the primary molded product 21. The secondary molded product 23 is a ridge 33 of the primary molded product 21.
The periphery is covered as shown in FIG. Then, a gap 35 may be formed between the primary molded product 21 and the secondary molded product 23 as shown in FIG.

On the other hand, in the present embodiment, as shown by the lengths of arrows B and C in FIG. When contracted, the degree of adhesion of the secondary molded product 23 to the inner peripheral surface 37 side of the projection 33 increases. Therefore, on the inner peripheral surface 37 of the ridge 33, a gap generated due to a difference in the heat shrinkage between the primary molded product 21 and the secondary molded product 23 can be blocked.

Here, also in the present embodiment, assembling of the switch knob 3 and the like is performed in the same manner as in the case shown in FIG. Therefore, after assembling, the predetermined amount 37 of grease applied to the heart cam 31 may remain on the upper surface side of the tubular portion 15 in some cases. Thus, similarly to the case described with reference to FIG. 9, when the switch knob 3 is pressed, a predetermined amount of grease 37 adheres to the inner ceiling surface 39 side of the switch knob 3. This adhesion causes the primary molded product 21 of the switch knob 3 to be in the same manner as described above.
A predetermined amount 37 of grease attempts to move toward the mark M due to capillary action from a gap 35 between the second molded product 23 and the secondary molded product 23.

However, due to the close contact of the secondary molded product 23 with the outer peripheral surface 37 of the ridge 33, the gap 35 is reliably blocked, and the grease is prevented from moving from the outside to the inside of the ridge 33. it can. Therefore, even if the gap 35 exists, the grease does not exude from the boundary surface with the secondary molded product 23 at the mark M. Therefore, when the switch knob 3 is operated, there is no discomfort,
By confirming the mark M, the operation can be surely performed.

In the present embodiment, the primary molded product 21
Is made of polyacetal, so heartcam 3
1 can be improved in durability. Second molded product 2
3 is made of an ABS resin or the like, so that even if it is exposed to high heat by sunlight or the like in the vehicle interior, its appearance can be reliably maintained by its heat resistance.

FIG. 6 is a sectional view of a switch knob 3A according to another embodiment of the present invention. In this embodiment, a concave strip 39 is formed in the primary molded product 21A. The concave portion 39 is formed in a circular shape on the outer peripheral side of the convex portion 25.

At the time of insert molding, the secondary molded product 23
A part 24 of A enters the recess 39 of the primary molded article 21. Therefore, due to the difference in the heat shrinkage rate between the primary molded product 21A and the secondary molded product 23A, the part 24 of the secondary molded product 23A closely adheres to the outer peripheral surface 40 side of the recess 39, and the same as above. Action and effect can be obtained.

FIG. 7 is a sectional view of a switch knob 3B according to still another embodiment. In the present embodiment, the shapes of the primary molded product 21B, the secondary molded product 23B, the protrusion 25B, and the like are slightly different from those of the embodiment of FIG.
And also in this embodiment, the convex part 41 is provided in the primary molded article 21B. Further, a concave ridge portion 43 is formed on the inner peripheral side of the convex ridge portion 41 to an intermediate portion in the circumferential direction.

As a result, the secondary molded product 23B comes into close contact with the long vertical wall 45 between the inner peripheral side of the protruding ridge 41 and the outer peripheral side of the concave ridge 43. However, the long vertical wall 45 between the convex ridge 41 and the concave ridge 43 is partial in the circumferential direction of the switch knob 3B. The portion where the long vertical wall 45 exists is located on the side of the heart cam 31 provided on the operating rod portion 27, and is located on the side where a part of the grease applied to the heart cam 31 remains on the cylindrical portion by a predetermined amount. I have. Therefore, the grease is particularly easily moved on the long vertical wall 45 side due to the capillary phenomenon. However, the close contact of the secondary molded product 23B with the long vertical wall 45 reliably prevents the movement of the grease, and allows the grease to move from around the convex portion 25B. It is possible to reliably prevent the grease from seeping out.

Further, since the protruding ridge 41 is provided in a circular shape on the outer peripheral side of the protruding portion 25B, the secondary molded product 23B surely adheres to the inner peripheral surface of the protruding ridge 41. This has the same effect as the embodiment of FIG. Further, in the present embodiment, the movement of the grease can be more reliably prevented by the long vertical wall 45, and the seepage from the convex portion 25B can be prevented.

In the above embodiment, the secondary molded product 23,
23A and 23B, the heat shrinkage of the primary molded products 21 and 21A,
Although it is set to be larger than 21B, it is also possible to reverse this. In this case, the surface of the close contact of the secondary molded product 23 with the convex ridge portion 33 and the contact surface of the secondary molded product 23A with the concave ridge portion 39 are opposite in inner and outer circumferences.

Further, in the example of FIG. 7, the secondary molded product 23B
Can form a long vertical wall 45 in close contact. Also, the primary molded products 21, 21A, 21B, the secondary molded products 23, 2
It is also possible to set 3A and 23B to the same heat shrinkage. Even in such a case, the convex ridges 33 and 41 and the concave ridges 3
Due to the existence of the greases 9 and 43, the movement path of the grease is lengthened, whereby the movement of the grease to the convex portions 25 and 25B side is suppressed, and the seepage of the grease from around the convex portions 25 and 25B is largely suppressed. Is possible.

Further, in the above embodiment, the resin molded product is applied as a switch knob of a power window switch of an automobile, but the same effect can be obtained by applying the resin molded product to another resin molded product.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view taken along the line SA-SA of FIG. 1 according to the embodiment;

FIG. 3 is a perspective view of a main part according to the embodiment.

FIG. 4 is an enlarged sectional view of a main part according to the embodiment.

FIG. 5 is a cross-sectional view illustrating a gap according to one embodiment.

FIG. 6 is a sectional view of a main part according to another embodiment of the present invention.

FIG. 7 is a sectional view of a main part according to still another embodiment of the present invention.

FIG. 8 is an exploded perspective view of a power window switch according to a conventional example.

FIG. 9 is a sectional view of a main part according to a conventional example.

FIG. 10 is a partially cutaway perspective view illustrating the attachment of grease according to a conventional example.

FIG. 11 is a cross-sectional view illustrating a place where a gap occurs according to a conventional example.

FIG. 12 is a cross-sectional view illustrating a gap according to a conventional example.

[Explanation of symbols]

 Reference Signs List 1 power window switch (switch) 2 switch case 3, 3A, 3B switch knob (resin molded product) 21, 21, A, 21B primary molded product 23, 23A, 23B secondary molded product 25, 25A, 25B convex portion 33, 41 Protrusions 39, 43 Recesses M Mark

Claims (4)

[Claims] 1. A primary molded product of a resin having a projection on its surface, and a secondary molded product of a resin covering the surface and the peripheral surface of the primary molded product by insert molding. In a resin molded product having a projection exposed on the surface of the secondary molded product, a ridge or a concave ridge is formed on the surface of the primary molded product in a circular shape on the outer peripheral side of the projection. Characterized resin molded product. 2. The resin molded product according to claim 1, wherein the primary molded product includes an operating rod portion formed with a part of a switch mechanism and movably supported by a switch case. The protrusion of the primary molded product displays a switch knob mark on the surface of the secondary molded product, and the secondary molded product forms an outer surface by covering a mechanism of the switch. Molded resin products. 3. The resin molded product according to claim 1, wherein the resin of the secondary molded product has a different heat shrinkage from the resin of the primary molded product. . 4. The resin molded product according to claim 3, wherein the primary molded product is formed of a hard resin, and the secondary molded product is formed of a heat-resistant resin. Resin molded products.