JP2004028239A - Base plate having groove part for injecting adhesive and nut - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely prevent the loosing of a male screw by providing a base plate for easily injecting an adhesive in a screw hole to be formed with a female screw. <P>SOLUTION: This base plate is provided with a groove part for injecting the adhesive in the circumference of the screw hole, which is formed with the female screw part for receiving the male screw part. The groove part is formed as a passage for injecting the adhesive after screwing the male screw part into the female screw part. When the adhesive is injected, it can be easily permeated inside the base plate. The adhesive permeated in this way sticks the male screw part to the female screw part so as to enable to surely suppress the loosening of the male screw. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a technique for preventing a male screw screwed into a substrate or the like from loosening. In particular, the present invention relates to a technique of using an adhesive to prevent a once-threaded male screw from rotating loosely.
[0002]
[Prior art]
2. Description of the Related Art Inside an electronic device or the like, a screw is generally used to fix a desired component at a specific position. Looking at the fixing structure using screws microscopically, the fixing structure is realized by the male screw on the screwing side and the female screw receiving the screw meshing with each other. Generally, a male screw is referred to as a screw (screw) or a screw, and has a cylindrical shaft portion provided with a male screw thread (hereinafter referred to as a male screw portion). On the other hand, the female screw has a female screw thread (hereinafter referred to as a female screw portion) formed by opening a screw hole in a substrate or the like for fixing components and the like and using a die or the like on an inner wall thereof. In many cases, it exists as a part of the information. However, the nut has a form in which the female screw exists alone.
[0003]
As described above, it is a general use of screws to fix a part or the like by screwing a male screw in a female screw so as not to move. However, the screw may be used for adjusting the height and angle of the circuit board by, for example, screwing a male screw into a female screw formed on the circuit board side and projecting the tip. When the screw is used for adjustment in this way, the fastening force may be weaker than when the purpose is to fix the part in a fixed position. However, if the male screw once screwed in rotates later and becomes loose, the set height and angle cannot be maintained.
[0004]
Therefore, conventionally, after a male screw is screwed into a female screw (screw hole), an adhesive is injected into the screw hole so that the male screw is not loosened.
[0005]
[Problems to be solved by the invention]
FIG. 1 is a plan view of a substrate having a screw hole into which a male screw is screwed in the related art, and FIG. 2 shows a state in which a male screw is screwed into the substrate, as viewed in the direction of arrows YY in FIG. FIG. As shown in FIG. 1, conventionally, an opening of a screw hole 101 formed on the substrate 100 side is substantially circular, and a female screw portion is formed on an inner wall of the screw hole.
[0006]
In FIG. 2, the male screw 10 is screwed into the substrate 100. The male screw part 11 formed in the male screw 10 is engaged with the female screw part 102 in the screw hole 101 of the substrate 100. Conventionally, in this state, an adhesive is injected from the end of the screw hole 101 to restrict the male screw 10 from rotating. FIG. 2 shows a case where the adhesive 105 is injected from below the screw hole 101 from which the male screw 10 protrudes. The adhesive 105 is injected using a press-fitting device such as a syringe (not shown).
[0007]
However, male screws 10 that are not custom-made and are manufactured in large quantities generally have low dimensional accuracy. Therefore, the state of the male screw portion 11 in the female screw portion 102 is not constant, and the engagement may be tight or loose. Therefore, it is not easy to uniformly inject the adhesive 105 into the inside of the screw hole 101 as illustrated in FIG. 2, and the adhesive 105 stays at the entrance. In such a state, the male screw portion 11 and the female screw portion 102 cannot be bonded by the adhesive 105, and the loosening of the male screw 10 cannot be reliably prevented.
[0008]
It is to be noted that a method of forming a V-groove along the shaft of the male screw 10 and injecting an adhesive is also conceivable. However, such a male screw becomes custom-made and causes an increase in cost. Further, there is a problem that the strength of the male screw 10 is reduced, so that it cannot be adopted.
[0009]
Accordingly, a main object of the present invention is to provide a substrate in which an adhesive can be easily injected into a screw hole in which a female screw portion is formed, and to reliably prevent a male screw from loosening.
[0010]
[Means for Solving the Problems]
The above object is achieved by a substrate provided with a groove for injecting an adhesive around a screw hole in which a female screw portion for receiving a male screw portion is formed.
[0011]
According to the first aspect of the present invention, after the male screw portion is screwed into the female screw portion, the groove portion exists as a passage for injecting the adhesive. Therefore, when the adhesive is injected, it can easily penetrate into the inside of the substrate. When the permeated adhesive cures, the male screw portion and the female screw portion are bonded to each other, so that loosening of the male screw can be reliably suppressed.
[0012]
Further, as described in claim 2, in the substrate according to claim 1, a plurality of the groove portions may be formed in a peripheral portion of the screw hole.
[0013]
According to the second aspect of the invention, since the adhesive can be injected from the plurality of grooves, the bonding between the male screw portion and the female screw portion can be realized more reliably. The number of grooves to be provided may be appropriately determined in consideration of the strength of the female screw and the like. The cross-sectional shape of the groove may be any of a circle, a triangle, a quadrangle, and a polygon, and the cross-sectional shapes of a plurality of grooves may be different from each other or the same. Also, the cross-sectional areas may be different or the same.
[0014]
Also, as in the third aspect, in the substrate according to the first aspect, the groove may be formed to penetrate from the front surface to the back surface of the substrate.
[0015]
According to the third aspect of the present invention, since the groove penetrates, the adhesive can be injected very easily.
[0016]
Further, as described in claim 4, in the substrate according to claim 1, one end of the groove may be open for injecting an adhesive, and the other end may be closed.
[0017]
According to the fourth aspect of the present invention, since the other end is closed, a decrease in strength due to the provision of the groove can be more reliably reduced. When a plurality of grooves are provided, the other ends of all the grooves do not need to be closed, and may be mixed with the grooves in a penetrating state.
[0018]
Further, as described in claim 5, in the substrate according to any one of claims 1 to 4, the groove may have a tapered surface inclined toward the male screw.
[0019]
According to the fifth aspect of the invention, since the groove is inclined toward the male screw, the adhesive injected earlier can be reliably guided to the male screw. In addition, the effect of a decrease in strength due to the provision of the groove around the female screw can be reduced.
[0020]
The above object can also be achieved by a nut having a groove for injecting an adhesive around a screw hole in which a female screw portion for receiving a male screw portion is formed.
[0021]
As described above, the nut has a form in which the female screw is provided alone. However, by providing the groove for injecting the adhesive, the loosening of the male screw (bolt) similarly screwed in can be prevented.
[0022]
Various forms can be adopted as in the case of the substrate described above. That is, as described in claim 7, in the nut according to claim 6, a plurality of the groove portions may be formed in a peripheral portion of the screw hole.
[0023]
Also, as in the eighth aspect, in the nut according to the sixth aspect, the groove may be formed to penetrate from the front surface to the back surface of the nut.
[0024]
According to a ninth aspect of the present invention, in the nut according to the sixth aspect, one end of the groove may be open for injecting an adhesive, and the other end may be closed.
[0025]
Also, as in the tenth aspect, in the nut according to any one of the sixth to ninth aspects, the groove may have a tapered surface inclined toward the male screw.
[0026]
As described in claim 11, when the nut according to any one of claims 6 to 10 is a substrate fixed in an opening provided for receiving a male screw portion, a female screw portion is inserted into a screw hole of the substrate. The same effect as provided can be obtained.
[0027]
Further, in the scope of the invention disclosed in this specification, as described in claim 12, a male screw and a substrate having a screw hole in which a female screw portion for receiving the male screw portion of the male screw is formed. A notch in the periphery of the screw hole, and a groove for injecting an adhesive for regulating the rotation of the male screw,
There is also included a screw loosening prevention structure in which rotation of the male screw with respect to the substrate is restricted by the adhesive injected into the groove and hardened.
[0028]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0029]
FIG. 3 is a plan view showing a substrate of the first embodiment provided with a screw hole in which a female screw is formed. FIG. 4 shows a state in which a male screw is screwed into this substrate. It is the figure shown by the YY arrow in FIG. The “substrate” naturally includes a circuit board on which an electronic circuit is formed. However, it is not limited to this. The term “substrate” broadly includes a plate-like member on which a female screw portion into which a male screw portion is screwed is formed. The material of the plate-shaped member may be made of metal or resin, and there is no particular limitation on the thickness, size, or the like. For example, a case where a flange portion extends from a component that is fixed to a base material of an electronic device by adjusting the height, and a female screw is formed in the flange portion. This flange portion corresponds to the “substrate” in this specification.
[0030]
As shown in FIG. 3, the substrate 1 of the present embodiment has a screw hole 2 in which a female screw portion is formed, and has a cross-sectional shape different from that of the conventional art. A groove 3 for injecting an adhesive is formed by cutting out the periphery of the screw hole 2. The groove 3 has an opening cross-sectional area large enough to accommodate a needle tip of a syringe used for press-fitting an adhesive, for example, and is formed in a groove shape. Although this opening is arc-shaped in FIG. 3, it may be V-shaped, rectangular, polygonal, or the like. The groove 3 shown here is formed in a state penetrating from the front surface to the back surface of the substrate 1.
[0031]
FIG. 4 shows a state in which the male screw portion 11 of the male screw 10 meshes with the female screw portion 12 of the screw hole 2. In the substrate 1 of this embodiment, since the groove portion 3 penetrates even when the male screw portion 11 is present in the female screw portion 12, the adhesive 105 can be easily formed as shown in FIG. Can enter inside. Therefore, the work of injecting the adhesive is easy, and the extruded adhesive quickly permeates into the substrate without stagnating at the end of the screw hole 2, so that the adhesive can be effectively used without waste.
[0032]
As shown in FIG. 4, if the adhesive 105 can be made to penetrate, the adhesive 105 penetrates into further details due to a capillary phenomenon between the thread of the male screw portion 11 and the thread of the female screw portion 12. . When the adhesive 105 that has penetrated deep into the screw is hardened in this way, a screw loosening prevention structure in which the screw threads are securely bonded to each other is embodied.
[0033]
The female screw portion 12 of the substrate 1 is formed by screwing a die or the like after the screw hole 2 is provided in the substrate 1. If the substrate is a metal material, it is sufficient to punch through the screw hole 2 by pressing. If the shape of the pressing punch is formed into a shape including the groove shown in FIG. The substrate 1 of the embodiment can be manufactured. When the substrate is made of a resin material, if a pin including the groove shown in FIG. 3 is set up in a mold into which the resin material is poured, the substrate 1 of this embodiment can be manufactured in the same manner as in the prior art. it can. That is, the process of forming the screw holes 23 of the present embodiment can manufacture the present substrate 1 with high accuracy without substantially changing the conventional process.
[0034]
FIG. 5 is a view showing a modification of the first embodiment in which a plurality of grooves 3 are formed in the screw holes 2. Although FIGS. 3 and 4 show an example in which one groove 3 for injecting the adhesive is formed, a plurality of grooves 3 may be formed as shown in FIG. FIG. 5 illustrates three grooves 3-1, 3-2, and 3-3. As described above, by providing a plurality of the groove portions 3 as necessary, the adhesive can be more reliably permeated into the inside of the substrate 1. However, since the groove 3 is formed by cutting the inner wall of the screw hole 2, it is necessary to determine the number of grooves 3 to be provided in consideration of a decrease in the strength of the female screw 12 and the like.
[0035]
Further, as shown in FIG. 5, when a plurality of grooves 3 are set, they may have the same shape or different shapes. FIG. 5 shows grooves 3 having different cross-sectional shapes. When the viscosity of the adhesive to be used is high, it is preferable that the peripheral part of the screw hole be cut out widely like the groove part 3-1. Further, from the viewpoint of securing the strength of the female screw portion 12, it is desirable to form the groove portion 3-1 like the groove portion 3-1 so as to increase the contact area with the male screw portion.
[0036]
FIG. 6 shows a modification in which one end of the groove 3 is closed. The groove 3 shown above is a groove penetrating from one end (front surface) to the other end (back surface) of the substrate as shown in FIG. 4, but the other end (back surface side) as shown by reference numeral 4 in FIG. May be closed. With such a structure, a decrease in the strength of the screw hole 2 due to the provision of the groove 3 can be suppressed. Further, a tapered surface 5 which is inclined as the vertical section of the groove 3 becomes deeper from the opening may be formed. In this way, the adhesive 105 can be guided to the male screw portion 11 on the deep side. Although the tapered surface 5 is formed at the end in FIG. 6, the tapered surface 5 may be formed so as to be inclined immediately from the opening into which the adhesive is injected.
[0037]
7 and 8 are views showing a nut according to a second embodiment of the present invention. FIG. 7 is a plan view of the nut 20 according to the embodiment, and FIG. 8 is a diagram illustrating a state where the nut 20 is fixed to the substrate 1. As described above, the nut has a female screw portion. Therefore, as shown in FIG. 7, by providing the groove 23 for injecting the adhesive into the screw hole 22 of the nut 20 in the same manner as in the case of the screw hole of the substrate as shown in FIG. It is possible to realize a smooth locking.
[0038]
FIG. 8 is a diagram illustrating an example in which the nut 20 illustrated in FIG. 7 is used. An opening 25 for receiving a nut is provided in the substrate 1, and the nut 20 is fixed here. Since such a nut 20 functions as a female screw provided in the above-described screw hole, a similar loosening prevention effect can be obtained.
[0039]
Although the preferred embodiment of the present invention has been described in detail, the present invention is not limited to the specific embodiment, and various modifications and changes may be made within the scope of the present invention described in the appended claims. Changes are possible.
[0040]
【The invention's effect】
As is clear from the above description, according to the present invention, after the male screw portion is screwed into the female screw portion, the groove portion exists as a passage for injecting the adhesive. Therefore, when the adhesive is injected, it can easily penetrate into the inside of the substrate. Since the adhesive that has penetrated in this way bonds the male screw portion and the female screw portion, loosening of the male screw can be reliably suppressed.
[Brief description of the drawings]
FIG. 1 is a plan view of a conventional substrate having a screw hole into which a male screw is screwed.
FIG. 2 is a diagram showing a state when a male screw is screwed into the substrate, as viewed in the direction of arrows YY in FIG. 1;
FIG. 3 is a plan view showing a substrate of the first embodiment having a screw hole in which a female screw is formed;
FIG. 4 is a diagram showing a state in which a male screw is screwed into the substrate, as viewed from arrows YY in FIG. 3;
FIG. 5 is a view showing a modification of the first embodiment in which a plurality of grooves are formed in a screw hole.
FIG. 6 is a view showing a modification of the first embodiment when one end of the groove is closed.
FIG. 7 is a plan view showing a nut according to a second embodiment.
8 is a diagram showing a state where the nut shown in FIG. 7 is fixed to a substrate.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Substrate 2 Screw hole 3 Groove 10 Male screw 11 Male screw 12 Female screw 105 Adhesive 20 Nut 22 Screw hole 23 Groove

Claims (12)

A substrate having a groove for injecting an adhesive around a screw hole in which a female screw portion for receiving a male screw portion is formed. The substrate according to claim 1,
A substrate, wherein a plurality of the groove portions are formed in a peripheral portion of the screw hole. The substrate according to claim 1,
The substrate, wherein the groove is formed to penetrate from the front surface to the rear surface of the substrate. The substrate according to claim 1,
A substrate, wherein one end of the groove is opened for injecting an adhesive, and the other end is closed. The substrate according to any one of claims 1 to 4,
The substrate, wherein the groove portion has a tapered surface inclined toward the male screw portion. A nut provided with a groove for injecting an adhesive around a screw hole in which a female screw portion for receiving a male screw portion is formed. The nut according to claim 6,
A plurality of the groove portions are formed in a peripheral portion of the screw hole. The nut according to claim 6,
The said groove part is penetrated from the front surface to the back surface of this nut, The nut characterized by the above-mentioned. The nut according to claim 6,
A nut, wherein one end of the groove is opened for injecting an adhesive, and the other end is closed. The nut according to any one of claims 6 to 9,
The said groove part has a taper surface which inclines toward the said male screw part side, The nut characterized by the above-mentioned. A substrate, wherein the nut according to any one of claims 6 to 10 is fixed in an opening provided for receiving a male screw portion. A substrate having a male screw, a screw hole in which a female screw portion for receiving the male screw portion of the male screw is formed, and an adhesive for notching a peripheral portion of the screw hole to restrict rotation of the male screw And a groove for injecting
A screw loosening prevention structure, wherein rotation of the male screw with respect to the substrate is restricted by an adhesive injected into the groove and hardened.

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