Item fixing device

Abstract

The present invention provides an article fixing device that can suppress deformation of the boss and suppress a decrease in the function of the tapping screw in fixing the article to the main body. [Solution] The article fixing device 100 according to the present disclosure comprises a main body 1 and a plurality of cylindrical bosses 4 having mounting holes 4a, an article-side mounting portion 2 having a thick-walled portion 2a and a thin-walled portion 2b and a plurality of through holes 2c corresponding to the mounting holes 4a of each of the plurality of bosses 4, and a plurality of tapping screws 3 inserted into each of the mounting holes 4a of the plurality of bosses 4 which are arranged opposite to each of the corresponding through holes 2c, wherein the boss 4 having a mounting hole 4a corresponding to the thin-walled portion 2b is formed to a depth proportional to the thickness of the thick-walled portion 2a and has a recessed portion 4h at its tip portion 4f to avoid engagement with the tapping screws 3, and further comprises an inner circumferential surface reinforcing rib 7 protruding radially from the inner circumferential surface of the boss 4.

Description

Technical Field

[0001] The present disclosure relates to an article fixing device.

Background Art

[0002] In mass production assembly of a resin molded product housing that fixes an article to a main body using a tapping screw, in order to reduce the process of changing torque, the tapping screw is tightened with the same torque. Further, the magnitude of the torque required for tightening the tapping screw depends on the screwing depth at which the tapping screw is inserted into the mounting hole of the boss provided in the main body, and increases as the screwing depth increases. Therefore, when the article has a thick portion and a thin portion having a thickness smaller than that of the thick portion, if tapping screws of the same length are employed, the screwing depth in the boss corresponding to the thick portion is relatively reduced, so there is a risk of excessive torque, and in the boss corresponding to the thin portion, the screwing depth is relatively increased, so there is a risk of insufficient torque and insufficient tightening of the tapping screw. Therefore, in order to tighten the tapping screw with the same torque, it was necessary to employ a plurality of types of tapping screws having different lengths to make the screwing depth into the boss corresponding to the thick portion and the screwing depth into the boss corresponding to the thin portion uniform. In this case, an increase in the assembly process due to employing a plurality of types of tapping screws has been a problem.

[0003] In the invention described in Patent Document 1, in the boss corresponding to the thin portion of the article, a recessed portion for avoiding engagement with the tapping screw is formed at the tip portion having the mounting hole into which the tapping screw is inserted. Further, the recessed portion is formed with a depth proportional to the thickness of the thick portion. Thereby, in the invention described in Patent Document 1, in the boss corresponding to the thin portion of the article, the screwing depth of the tapping screw can be adjusted to decrease, so that the screwing depth into the boss corresponding to the thick portion and the screwing depth into the boss corresponding to the thin portion can be made uniform. Therefore, the invention described in Patent Document 1 can employ tapping screws of the same length when tightening the tapping screw with the same torque.

Prior Art Documents

[0004] [Patent Document 1] Japanese Utility Model Publication No. 5-92511 [Overview of the project] [Problems that the invention aims to solve]

[0005] However, in the invention described in Patent Document 1, when a tapping screw is inserted into the mounting hole of the boss and the tapping screw fixes an article to the main body, an axial force acts on the boss in the axial direction, and there is a risk that the boss may buckle and deform by being crushed in the axial direction due to this axial force. Thus, in the invention described in Patent Document 1, there was a risk that the deformation of the boss would lead to a decrease in the function of the tapping screw in fixing an article to the main body.

[0006] This disclosure is made to solve the above-mentioned problems and aims to provide an article fixing device that can suppress deformation of the boss and suppress a decrease in the function of the tapping screw in fixing the article to the main body. [Means for solving the problem]

[0007] The article fixing device according to this disclosure comprises a plurality of cylindrical bosses provided on the main body and having mounting holes, an article mounting portion to be attached to the main body having a thick portion and a thin portion that is thinner than the thick portion, the thick portion and the thin portion having a plurality of through holes corresponding to the mounting holes of each of the plurality of bosses, and a plurality of tapping screws, each of the same length, which are inserted from the through hole side into the mounting holes of each of the plurality of bosses arranged opposite each of the corresponding through holes, and which fix the article mounting portion to the plurality of bosses, and each of the plurality of bosses has a mounting hole corresponding to the through hole provided in the thin portion An article fixing device comprising: mounting holes and mounting holes corresponding to through holes provided in thick-walled portions having the same inner diameter; among a plurality of bosses, the boss having a mounting hole corresponding to a through hole provided in a thin-walled portion is formed to a depth proportional to the thickness of the thick-walled portion, and has a recess on the inner circumferential surface side of the tip portion with an inner diameter larger than the diameter of the tapping screw, and the screwing depth of each of the plurality of tapping screws into the plurality of bosses is the same; further comprising an inner circumferential surface reinforcing rib provided in the recess formed at the tip portion, the distance to the center of the diameter of the boss is greater than the radius of the tapping screw, and projecting from the inner circumferential surface of the recess portion in the radial direction of the boss.

[0008] Furthermore, the article fixing device according to this disclosure comprises: a plurality of cylindrical bosses provided on the main body and having mounting holes; an article mounting portion to be attached to the main body, having a thick portion and a thin portion less thick than the thick portion, the thick portion and the thin portion having a plurality of through holes corresponding to the mounting holes of each of the plurality of bosses; and a plurality of tapping screws, each of the same length, which are inserted from the through hole side into the mounting holes of each of the plurality of bosses arranged opposite each of the corresponding through holes, and which fix the article mounting portion to the plurality of bosses. The present invention relates to an article fixing device characterized in that each of the multiple bosses has the same inner diameter for the mounting hole corresponding to the through hole in the thin-walled portion and the mounting hole corresponding to the through hole in the thick-walled portion, and among the multiple bosses, the boss having the mounting hole corresponding to the through hole in the thin-walled portion is formed to a depth proportional to the thickness of the thick-walled portion and has a recess on the inner circumferential surface side of the tip that has an inner diameter larger than the diameter of the tapping screw, and the screwing depth of each of the multiple tapping screws into the multiple bosses is the same, and the tip where the recess is formed is tapered. [Effects of the Invention]

[0009] According to this disclosure, the article fixing device can suppress deformation of the boss and suppress a decrease in the function of the tapping screw in fixing the article to the main body. [Brief explanation of the drawing]

[0010] [Figure 1] This is a schematic diagram of the article fixing device according to Embodiment 1. [Figure 2] This is a schematic cross-sectional view illustrating the recess formed at the tip of the first boss in Embodiment 1. [Figure 3] This is a schematic diagram showing the boss of Embodiment 1 with a tapping screw inserted. [Figure 4] This is a schematic cross-sectional view illustrating the inner circumferential surface reinforcing rib provided at the tip of the first boss in Embodiment 1. [Figure 5] This is a schematic diagram showing a modified example of the inner circumferential reinforcing rib 7 of Embodiment 1. [Figure 6]This is a schematic cross-sectional view illustrating the tapered shape of the tip of the first boss in Embodiment 2. [Figure 7] This is a schematic cross-sectional view illustrating the tapered shape of Embodiment 2 applied to the first boss of Embodiment 1. [Figure 8] This is a schematic diagram illustrating the outer circumferential reinforcing ribs of Embodiment 3. [Figure 9] This is a schematic diagram illustrating a modified example of the outer circumferential reinforcing rib 9 of Embodiment 3. [Modes for carrying out the invention]

[0011] The article fixing device according to the embodiment will be described below with reference to the drawings. The following embodiment is merely an example, and it is possible to combine the embodiments as appropriate and modify each embodiment as appropriate. In the drawings, similar components are denoted by the same reference numerals. Note that the relative dimensions or shapes of the components in each drawing may differ from those of the actual components.

[0012] Embodiment 1. The article fixing device 100 in Embodiment 1 will be described using Figures 1, 2, 3, and 4. Figure 1 is a schematic diagram of the article fixing device 100 in Embodiment 1. Figure 2 is a schematic cross-sectional diagram illustrating the recess 4h formed in the tip portion 4f of the first boss 4b in Embodiment 1. Figure 2A shows a cross-sectional view of the entire first boss 4b, and Figure 2B is a schematic diagram of the first boss 4b viewed from the tip portion 4f side. Figure 3 is a schematic diagram of the boss 4 in Embodiment 1 with a tapping screw 3 inserted. In Figures 2 and 3, the tapered shape of the tip portion 4f of the boss 4 and the inner circumferential surface reinforcing rib 7 provided in the recess 4h formed in the tip portion 4f of the boss 4, which will be described later, are omitted from the illustration. Figure 4 is a schematic cross-sectional diagram illustrating the inner circumferential surface reinforcing rib 7 provided in the tip portion 4f of the first boss 4b in Embodiment 1. Figure 4A shows a cross-sectional view of the entire first boss 4b, and Figure 4B is a schematic view of the first boss 4b as seen from the tip 4f side.

[0013] As shown in Figure 1, the article fixing device 100 comprises a main body 1, an article-side mounting part 2, and tapping screws 3. The article-side mounting part 2 is a part of an article (not shown in its entirety) that is attached to the main body 1, and is a mounting part provided on the article for fixing the article to the main body. The article-side mounting part 2 is fixed to the main body 1 by tapping screws 3. For example, the main body 1 is a liquid crystal panel and a case provided on the liquid crystal panel, and the article is a component of the liquid crystal panel, a circuit board, and accessories, etc.

[0014] The main body 1 is provided with multiple cylindrical bosses 4. Each boss 4 has a mounting hole 4a into which a tapping screw 3 is inserted. Hereinafter, when multiple bosses 4 are not distinguished, they will simply be referred to as bosses 4.

[0015] As shown in Figure 1, the article-side mounting portion 2 has a thick portion 2a and a thin portion 2b that is thinner than the thick portion 2a. The thick portion 2a and the thin portion 2b are provided with multiple through holes 2c corresponding to the mounting holes 4a of the multiple bosses 4. For the sake of explanation, below, the boss 4 having mounting holes 4a corresponding to the through holes 2c provided in the thin portion 2b will be referred to as the first boss 4b, and the boss 4 having mounting holes 4a corresponding to the through holes 2c provided in the thick portion 2a will be referred to as the second boss 4d.

[0016] A plurality of tapping screws 3 are used corresponding to the mounting holes 4a of each of the plurality of bosses 4. Hereinafter, when not distinguishing between the plurality of tapping screws 3, they are simply referred to as tapping screws 3. The tapping screws 3 are inserted from the side of the plurality of through holes 2c into the mounting holes 4a of each of the plurality of bosses 4 disposed opposite to each of the corresponding plurality of through holes 2c. That is, the plurality of bosses 4 are fixed to the article-side attachment portion 2 by the tapping screws 3. Also, the plurality of tapping screws 3 each have the same length. Thereby, the article fixing device 100 can suppress an increase in the assembly process by adopting tapping screws 3 of the same length, without the need to select tapping screws of different lengths depending on the difference in the assembly location. Here, the same length does not exactly mean the lengths are the same. For example, due to errors in the manufacturing process of the tapping screws 3, etc., it also includes cases where the lengths of the plurality of tapping screws 3 are different to such an extent that an increase in the assembly process of the article fixing device 100 can be suppressed.

[0017] Also, as shown in FIGS. 2 and 3, the first boss 4b has a recess 4h on the inner peripheral surface 4g side of the tip portion 4f to avoid engagement with the tapping screw 3. That is, the inner diameter of the recess 4h formed at the tip portion 4f is larger than the diameter of the tapping screw 3. Here, the tip portion 4f of the boss 4 is the tip on the side that contacts the article-side attachment portion 2 when the mounting hole 4a of the boss 4 is disposed opposite to the through hole 2c of the article-side attachment portion 2.

[0018] Also, the recess 4h formed at the tip portion 4f of the boss 4 is formed to a depth proportional to the thickness of the thick portion 2a of the article-side attachment portion 2. At this time, the recess 4h is formed such that the screwing depth 5 of the tapping screw 3 inserted into the mounting hole 4a of the first boss 4b and the screwing depth 6 of the tapping screw 3 inserted into the mounting hole 4a of the second boss 4d are the same. Thus, when the article fixing device 100 fixes the article-side attachment portion 2 having the thick portion 2a and the thin portion 2b to the main body 1, the screwing depth of the tapping screw 3 into the boss 4 can be adjusted and made uniform.

[0019] The amount of torque required to tighten the tapping screw 3 depends on the screwing depth to which the tapping screw 3 is inserted into the mounting hole 4a of the boss 4 provided on the main body 1. Therefore, by configuring the article fixing device 100 as described above, it is possible to tighten the tapping screw 3 with the same torque even when fixing the article-side mounting part 2, which has a thick-walled part 2a and a thin-walled part 2b, to the main body 1. Here, the screwing depth 5 of the tapping screw 3 inserted into the mounting hole 4a of the first boss 4b and the screwing depth 6 of the tapping screw 3 inserted into the mounting hole 4a of the second boss 4d are said to be the same, but this does not mean that the depths are exactly the same. For example, due to errors in the manufacturing process of the boss 4, the respective screwing depths may differ to the extent that it is possible to tighten the tapping screw 3 with the same torque.

[0020] As shown in Figure 3, each of the multiple bosses 4 has the same inner diameter for the mounting hole 4a corresponding to the through hole 2c provided in the thin-walled portion 2b and the mounting hole 4a corresponding to the through hole 2c provided in the thick-walled portion 2a. That is, in Figure 3, the inner diameter 4c of the mounting hole 4a of the first boss 4b where the tapping screw 3 is inserted is the same as the inner diameter 4e of the mounting hole 4a of the second boss 4d where the tapping screw 3 is inserted. As a result, fastening can be performed with a single type of tapping screw 3 without having to use multiple types of tapping screws 3, so the article fixing device 100 can suppress the increase in assembly steps caused by using multiple types of tapping screws 3 with different inner diameters, or reduce costs by reducing the number of parts. Here, "the inner diameters of the bosses 4 are the same" does not mean that the inner diameters are exactly the same, and includes cases where the inner diameters of the multiple bosses 4 differ to the extent that fastening can be performed with a single type of tapping screw 3 due to, for example, errors in the manufacturing process of the bosses 4.

[0021] As described above, when a tapping screw 3 is inserted into the mounting hole 4a of the boss 4 and an item is fixed to the main body 1 by the tapping screw 3, an axial force acts on the boss 4 in the direction of insertion of the tapping screw 3, i.e., in the axial direction of the boss 4. Due to this axial force, the tip portion 4f of the boss 4, where the recess portion 4h is formed, may buckle and deform by being crushed in the axial direction. This could lead to a decrease in the function of the tapping screw 3 in fixing the item to the main body 1.

[0022] As shown in Figure 4, in the article fixing device 100 of Embodiment 1, an inner circumferential reinforcing rib 7 is provided on the inner circumferential surface of the recess 4h formed in the tip portion 4f of the first boss 4b. Also as shown in Figure 4, the inner circumferential reinforcing rib 7 is provided on the inner circumferential surface of the recess 4h and has a shape that protrudes radially from the first boss 4b. Furthermore, as shown in Figure 4, the inner circumferential reinforcing rib 7 is provided in a columnar shape from the tip side that contacts the article-side mounting portion 2 when the mounting hole 4a of the boss 4 is positioned opposite the through hole 2c of the article-side mounting portion 2, to the main body 1 side where the boss 4 is provided. As a result, the tip portion 4f of the first boss 4b is reinforced, and the axial strength of the tip portion 4f of the first boss 4b with the inner circumferential reinforcing rib 7 is higher than when the inner circumferential reinforcing rib 7 is not provided on the tip portion 4f of the first boss 4b.

[0023] In this case, as shown in Figure 4, the distance 7a from the inner circumferential reinforcing rib 7 to the center of the diameter of the boss 4 is set to be larger than the radius 4k of the portion in the mounting hole 4a of the first boss 4b into which the tapping screw 3 is inserted, so that the inner circumferential reinforcing rib 7 does not come into contact with the tapping screw 3. That is, the distance 7a from the inner circumferential reinforcing rib 7 to the center of the diameter of the boss 4 is larger than the radius of the tapping screw 3 inserted into the mounting hole 4a of the first boss 4b. As a result, the article fixing device 100 can prevent the inner circumferential reinforcing rib 7 from coming into contact with the tapping screw 3 and increasing the torque when tightening the tapping screw 3.

[0024] Furthermore, the number of inner surface reinforcing ribs 7 is not particularly limited and can be arbitrarily changed depending on the height of the boss 4 or the size of the tapping screws 3. As a result, the article fixing device 100 of Embodiment 1 can determine the number of inner surface reinforcing ribs 7 according to the required strength, thereby suppressing the use of more material than necessary.

[0025] Thus, the article fixing device 100 in Embodiment 1 comprises a plurality of cylindrical bosses 4 provided on the main body 1 and having mounting holes 4a, an article-side mounting portion 2 which is an article to be attached to the main body 1 and has a thick-walled portion 2a and a thin-walled portion 2b which is thinner than the thick-walled portion 2a, and the thick-walled portion 2a and the thin-walled portion 2b are provided with a plurality of through holes 2c corresponding to the mounting holes 4a of each of the plurality of bosses 4, and a plurality of tapping screws 3 which are all the same length and are inserted from the through-hole 2c side into the mounting holes 4a of each of the plurality of bosses 4 which are arranged opposite each of the corresponding through-holes 2c, and fix the article-side mounting portion 2 to the plurality of bosses 4, and each of the plurality of bosses 4 has a through hole 2c provided in the thin-walled portion 2b The article fixing device 100 further comprises an inner circumferential surface reinforcing rib 7 provided in the recess 4h formed on the tip 4f, the distance 7a to the center of the diameter of the boss 4 being greater than the radius of the tapping screw 3, and the inner circumferential surface reinforcing rib 7 projecting radially from the boss 4 from the inner circumferential surface 4g of the recess 4h.

[0026] By adopting the above configuration, the article fixing device 100 in Embodiment 1 can increase the axial strength of the tip portion 4f of the first boss 4b, which is provided with the inner circumferential reinforcing rib 7, compared to the case where the inner circumferential reinforcing rib 7 is not provided on the tip portion 4f of the first boss 4b. As a result, the article fixing device 100 in Embodiment 1 has increased strength against axial force at the tip portion 4f of the first boss 4b, which can suppress deformation of the boss 4 and suppress a decrease in the function of the tapping screw 3 in fixing the article to the main body 1. Therefore, the article fixing device 100 in Embodiment 1 can suppress distortion of the article fixed to the main body 1, insufficient tightening of the tapping screw 3, and loosening of the tapping screw 3, thereby ensuring stable product quality. Furthermore, since the article fixing device 100 in Embodiment 1 can increase the strength against axial force at the tip portion 4f of the first boss 4b, it can be actively adopted even for molded products made from low-strength materials such as recycled materials. As a result, the article fixing device 100 in Embodiment 1 can contribute to reducing product costs by changing to a softer material, and to reducing environmental impact by adopting recycled materials.

[0027] In Figure 4B, the inner circumferential reinforcing rib 7 of Embodiment 1 has a substantially square cross-section in the radial direction of the boss 4, but is not limited to this. Figure 5 is a schematic diagram showing a modified example of the inner circumferential reinforcing rib 7 of Embodiment 1. Figure 5A shows that the cross-section of the inner circumferential reinforcing rib 7 in the radial direction of the boss 4 is substantially square, and the inner circumferential reinforcing rib 7 is substantially rectangular prism-shaped. Figure 5B shows that the cross-section of the inner circumferential reinforcing rib 7 in the radial direction of the boss 4 is triangular, and the inner circumferential reinforcing rib 7 is triangular prism-shaped. By making the cross-section of the inner circumferential reinforcing rib 7 in the radial direction of the boss 4 triangular, the article fixing device 100 of Embodiment 1 can provide more inner circumferential reinforcing ribs 7 even when the space for providing the inner circumferential reinforcing ribs 7 is narrow, compared to the case where the cross-section of the inner circumferential reinforcing rib 7 in the radial direction of the boss 4 is substantially square, thereby increasing the strength of the tip portion 4f of the first boss 4b against axial force.

[0028] Furthermore, the present invention can be applied if there are two or more locations with different thicknesses in the article-side mounting portion 2. That is, for example, even if the article fixing device 100 has an article-side mounting portion 2 with a first location 2d, a second location 2e which is thinner than the first location 2d, and a third location 2f which is thinner than the second location 2e, as shown in Figure 1, the same effect can be achieved by forming a recess 4h at the tip 4f of the first boss 4b and providing an inner circumferential reinforcing rib 7 at the tip 4f, as described above.

[0029] Embodiment 2. The article fixing device 101 in Embodiment 2 will now be described. In Embodiment 1, the article fixing device 100 includes an inner circumferential surface reinforcing rib 7 provided in a recess 4h formed in the tip portion 4f of the first boss 4b. The article fixing device 101 in Embodiment 2 differs from the article fixing device 100 in that the tip portion 4f of the first boss 4b, where the recess 4h is formed, has a tapered shape. Components similar to those in Embodiment 1 are denoted by the same reference numerals. Furthermore, a detailed description of components similar to those in Embodiment 1 will be omitted, and the differences from Embodiment 1 will be described mainly.

[0030] Figure 6 is a schematic cross-sectional view illustrating the tapered shape of the tip portion 4f of the first boss 4b in Embodiment 2. Figure 6A shows a cross-sectional view of the entire first boss 4b, and Figure 6B is a schematic view of the first boss 4b as seen from the tip portion 4f side. As shown in Figure 6, the tip portion 4f of the first boss 4b, in which the recess portion 4h is formed, is tapered, with an inclination such that the inner diameter of the boss 4 decreases from the tip side that contacts the article-side mounting portion 2 when the mounting hole 4a of the boss 4 is positioned opposite the through hole 2c of the article-side mounting portion 2, toward the main body 1 side where the boss 4 is provided. As a result, the volume of the tip portion 4f of the first boss 4b increases, and the axial strength of the tapered tip portion 4f of the first boss 4b is higher than when the tip portion 4f of the first boss 4b is not tapered.

[0031] In this case, as shown in Figure 6, the inner diameter 8 of the tapered tip portion 4f located on the body 1 side is set to be larger than the inner diameter 4c of the mounting hole 4a of the first boss 4b into which the tapping screw 3 is inserted, so that the tip portion 4f of the boss 4 does not come into contact with the tapping screw 3. As a result, the article fixing device 101 can prevent the tapered tip portion 4f of the boss 4 from coming into contact with the tapping screw 3, thereby preventing an increase in the torque when tightening the tapping screw 3.

[0032] Figure 7 is a schematic cross-sectional view illustrating the tapered shape of Embodiment 2 applied to the first boss 4b of Embodiment 1. Figure 7A shows a cross-sectional view of the entire first boss 4b, and Figure 7B is a schematic view of the first boss 4b viewed from the tip portion 4f side. As shown in Figure 7, the article fixing device 101 in Embodiment 2 may be configured such that an inner circumferential reinforcing rib 7 is provided in the recess 4h formed in the tip portion 4f of the first boss 4b, and the tip portion 4f where the recess 4h is formed has a tapered shape.

[0033] Thus, the article fixing device 101 in Embodiment 2 comprises a plurality of cylindrical bosses 4 provided on the main body 1 and having mounting holes 4a, an article-side mounting portion 2 which is an article-to-mount portion attached to the main body 1 and has a thick-walled portion 2a and a thin-walled portion 2b that is thinner than the thick-walled portion 2a, and the thick-walled portion 2a and the thin-walled portion 2b are provided with a plurality of through holes 2c corresponding to the mounting holes 4a of each of the plurality of bosses 4, and a plurality of tapping screws, each of the same length, which are inserted from the through-hole 2c side into the mounting holes 4a of each of the plurality of bosses 4 which are arranged opposite each of the corresponding through-holes 2c, and fix the article-side mounting portion 2 to the plurality of bosses 4. The article fixing device 101 comprises a boss 3 and a plurality of bosses 4, each of which has a mounting hole 4a corresponding to a through hole 2c provided in a thin-walled portion 2b and a mounting hole 4a corresponding to a through hole 2c provided in a thick-walled portion 2a, both having the same inner diameter, and of the plurality of bosses 4, the boss 4 having a mounting hole 4a corresponding to a through hole 2c provided in a thin-walled portion 2b is formed to a depth proportional to the thickness of the thick-walled portion 2a, and has a recessed portion 4h with an inner diameter larger than the diameter of the tapping screw 3 on the inner circumferential surface 4g side of the tip portion 4f, and the screwing depth of each of the plurality of tapping screws 3 into the plurality of bosses 4 is the same, wherein the tip portion 4f on which the recessed portion 4h is formed is tapered.

[0034] By adopting the above configuration, the article fixing device 101 in Embodiment 2 can increase the axial strength of the tip portion 4f of the tapered first boss 4b compared to the case where the tip portion 4f of the first boss 4b is not tapered. As a result, the article fixing device 101 in Embodiment 2 has increased strength against axial force of the tip portion 4f of the first boss 4b, which can suppress deformation of the boss 4 and suppress a decrease in the function of the tapping screw 3 in fixing the article to the main body 1. Therefore, the article fixing device 101 in Embodiment 1 can suppress distortion of the article fixed to the main body 1, insufficient tightening of the tapping screw 3, and loosening of the tapping screw 3, thereby ensuring stable product quality. Furthermore, since the article fixing device 101 in Embodiment 2 can increase the strength against axial force of the tip portion 4f of the first boss 4b, it can be actively adopted even for molded products made from low-strength materials such as recycled materials. As a result, the article fixing device 101 in Embodiment 2 can contribute to reducing product costs by changing to a softer material and to reducing environmental impact by adopting recycled materials.

[0035] Furthermore, the tip portion 4f of the first boss 4b, which has a recessed portion 4h formed thereon, is molded in a tapered shape such that the inner diameter of the boss 4 decreases from the tip side that contacts the article-side mounting portion 2 when the mounting hole 4a of the boss 4 is positioned opposite the through hole 2c of the article-side mounting portion 2, toward the main body 1 side on which the boss 4 is provided. With the above configuration, the article fixing device 101 in Embodiment 2 can improve the resin flow when the boss 4 is molded, thereby suppressing the occurrence of short shots that cause a part of the molded product to break off. In addition, with the above configuration, the article fixing device 101 in Embodiment 2 can easily remove the boss 4 from the mold. As a result, the article fixing device 101 in Embodiment 2 can improve quality and productivity, and can also suppress cost increases due to rework, etc.

[0036] Furthermore, in the second embodiment, the article fixing device 101 may be configured such that, as shown in Figure 7, an inner circumferential reinforcing rib 7 is provided in the recess 4h formed in the tip portion 4f of the first boss 4b, and the tip portion 4f on which the recess 4h is formed is tapered. Even in this case, the article fixing device 101 in the second embodiment has increased strength against axial force at the tip portion 4f of the first boss 4b, thereby suppressing deformation of the boss 4 and preventing a decrease in the function of the tapping screw 3 in fixing the article to the main body 1.

[0037] Furthermore, compared to the article fixing device 100 of Embodiment 1, in which an inner circumferential surface reinforcing rib 7 is provided in a recess 4h formed in the tip portion 4f of the first boss 4b, the article fixing device 101 of Embodiment 2, in which the tip portion 4f with the recess 4h is tapered, has a higher strength against axial force at the tip portion 4f of the first boss 4b. This allows for greater suppression of deformation of the boss 4, and further suppression of the deterioration of the tapping screw 3's function of fixing articles to the main body 1.

[0038] Furthermore, compared to the article fixing device 101 in Embodiment 2, where the tip portion 4f with the recessed portion 4h is tapered, the article fixing device 100 in Embodiment 1, where the inner circumferential reinforcing rib 7 is provided in the recessed portion 4h formed in the tip portion 4f of the first boss 4b, can suppress the use of more material than necessary by changing the number of inner circumferential reinforcing ribs 7 as described above. Therefore, both the configuration in which the inner circumferential reinforcing rib 7 is provided in the recessed portion 4h formed in the tip portion 4f of the first boss 4b, and the configuration in which the tip portion 4f with the recessed portion 4h is tapered, have their advantages.

[0039] Furthermore, although it has been described that the tip portion 4f of the first boss 4b, in which the recessed portion 4h is formed, is tapered so that the inner diameter of the boss 4 decreases from the tip side that contacts the article-side mounting portion 2 when the mounting hole 4a of the boss 4 is positioned opposite the through hole 2c of the article-side mounting portion 2, toward the main body 1 side on which the boss 4 is provided, the invention is not limited to this. That is, the same effect can be achieved even if the tip portion 4f of the first boss 4b, in which the recessed portion 4h is formed, is tapered so that the inner diameter of the boss 4 increases from the tip side that contacts the article-side mounting portion 2 when the mounting hole 4a of the boss 4 is positioned opposite the through hole 2c of the article-side mounting portion 2, toward the main body 1 side on which the boss 4 is provided.

[0040] Furthermore, the present invention can be applied if there are two or more locations with different thicknesses in the article-side mounting portion 2. That is, for example, even if the article fixing device 101 has an article-side mounting portion 2 with a first location 2d, a second location 2e which is thinner than the first location 2d, and a third location 2f which is thinner than the second location 2e, as shown in Figure 1, the same effect can be achieved by forming a recess 4h in the tip 4f of the first boss 4b and shaping the tip 4f into a tapered shape, as described above.

[0041] Embodiment 3. The article fixing device 102 in Embodiment 3 will now be described. The article fixing device 102 in Embodiment 3 differs from the article fixing device 100 in Embodiment 1 in that it is provided on the outer peripheral surface 4i side of the plurality of bosses 4, and includes outer peripheral surface reinforcing ribs 9 that protrude in a tangential direction perpendicular to the radial direction of each of the plurality of bosses 4, and have a surface 9a that includes a part of the tangential extending in that tangential direction. Components similar to those in Embodiment 1 are denoted by the same reference numerals. Furthermore, a detailed description of components similar to those in Embodiment 1 will be omitted, and the components that differ from those in Embodiment 1 will be described mainly.

[0042] Figure 8 is a schematic diagram illustrating the outer circumferential reinforcing rib 9 of Embodiment 3. Figure 8A shows a schematic diagram of a conventional boss 200 viewed from the tip side, and Figure 8B shows a schematic diagram of the boss 4 in Embodiment 3 viewed from the tip 4f side. When a tapping screw 3 is inserted into the boss 4, torque acts on the boss 4 in the rotational direction of the tapping screw 3, causing the boss 4 to twist and deform. Therefore, as shown in Figure 8A, the conventional boss 200 is provided with an outer circumferential reinforcing rib 200a on the outer circumferential side. As a result, the strength of the boss 200 against torque is increased in the conventional boss 200, and deformation of the boss 200 can be suppressed.

[0043] However, in the conventional structure shown in Figure 8A, the torque acts laterally against the direction in which the outer surface reinforcing rib 200a protrudes, which presents a problem in that it is less effective at suppressing the deformation of the boss 200.

[0044] Therefore, as shown in Figure 8B, the outer circumferential reinforcing rib 9 of Embodiment 3 is provided on the outer circumferential surface 4i side of the boss 4, protrudes in a tangential direction perpendicular to each radial direction of the boss 4, and has a surface 9a that includes a part of the tangential extending in that tangential direction. As a result, in Embodiment 3, the torque applied when tightening screws acts on the boss 4 in the direction in which the outer circumferential reinforcing rib 9 protrudes, thus increasing the strength of the boss 4 against torque compared to a boss 200 with a conventional structure, and thus suppressing deformation of the boss 4.

[0045] Figure 9 is a schematic diagram illustrating a modified example of the outer circumferential reinforcing rib 9 of Embodiment 3. When the boss 4 is positioned near the wall surface 1a of the main body, the outer circumferential reinforcing rib 9 may be joined to the wall surface 1a of the main body, as shown in Figure 9. In this case, the outer circumferential reinforcing rib 9 is positioned such that a surface 9a, which includes a portion of the tangential extending in the tangential direction of the boss 4, is perpendicular to the wall surface 1a of the main body. As a result, in Embodiment 3, the boss 4 is further reinforced by the outer circumferential reinforcing rib 9 and the wall surface 1a of the main body, thereby increasing the strength of the boss 4 against torque and further suppressing deformation of the boss 4.

[0046] Furthermore, the number of outer surface reinforcing ribs 9 is not particularly limited and can be arbitrarily changed depending on the height of the boss 4 or the size of the tapping screws 3. As a result, the article fixing device 102 of Embodiment 3 can determine the number of outer surface reinforcing ribs 9 according to the required strength, thereby suppressing the use of more material than necessary.

[0047] The article fixing device 102 in Embodiment 3, similar to Embodiments 1 and 2, comprises a plurality of cylindrical bosses 4 provided on the main body 1 and having mounting holes 4a, an article-side mounting portion 2 for attaching an article to the main body 1, having a thick-walled portion 2a and a thin-walled portion 2b that is thinner than the thick-walled portion 2a, and the thick-walled portion 2a and thin-walled portion 2b are provided with a plurality of through holes 2c corresponding to the mounting holes 4a of each of the plurality of bosses 4, and a plurality of tapping screws 3 each having the same length, which are inserted from the through-hole 2c side into the mounting holes 4a of each of the plurality of bosses 4 which are arranged opposite each of the corresponding through-holes 2c, and fix the article-side mounting portion 2 to the plurality of bosses 4, and each of the plurality of bosses 4 has a mounting hole 4a corresponding to the through hole 2c provided in the thin-walled portion 2b and a thick-walled portion The article fixing device 102 further comprises an inner circumferential surface reinforcing rib 7 provided in the recess 4h formed on the tip portion 4f, the distance 7a to the center of the diameter of the boss 4 being greater than the radius of the tapping screw 3, and the inner circumferential surface reinforcing rib 7 projecting radially from the boss 4 from the inner circumferential surface 4g of the recess 4h, and the tip portion 4f having a tapered shape.

[0048] By adopting the above configuration, the article fixing device 102 in Embodiment 3 can increase the axial strength of the tip portion 4f of the first boss 4b, which is provided with an inner circumferential reinforcing rib 7, compared to the case where the inner circumferential reinforcing rib 7 is not provided on the tip portion 4f of the first boss 4b. Furthermore, the article fixing device 102 in Embodiment 3 can increase the axial strength of the tapered tip portion 4f of the first boss 4b compared to the case where the tip portion 4f of the first boss 4b is not tapered. As a result, the article fixing device 102 in Embodiment 3 has increased strength against axial force of the tip portion 4f of the first boss 4b, which can suppress deformation of the boss 4 and suppress a decrease in the function of the tapping screw 3 in fixing the article to the main body 1. Therefore, the article fixing device 102 in Embodiment 3 can suppress distortion of the article fixed to the main body 1, insufficient tightening of the tapping screw 3, and loosening of the tapping screw 3, thereby ensuring stable product quality. Furthermore, the article fixing device 102 in Embodiment 3 can increase the strength of the tip portion 4f of the first boss 4b against axial force, thus enabling its active adoption even in molded products made from low-strength materials such as recycled materials. As a result, the article fixing device 102 in Embodiment 1 can contribute to reducing product costs by changing to a softer material and to reducing environmental impact by adopting recycled materials.

[0049] Furthermore, the outer circumferential reinforcing rib 9 of Embodiment 3 is provided on the outer circumferential surface 4i side of the multiple bosses 4, protrudes in a tangential direction perpendicular to the radial direction of each of the multiple bosses 4, and has a surface 9a that includes a part of the tangential extending in that tangential direction. With the above configuration, the article fixing device 102 of Embodiment 3 has increased strength of the bosses 4 against torque, so deformation of the bosses 4 can be suppressed, and a decrease in the function of the tapping screws 3 in fixing articles to the main body 1 can be suppressed. In addition, the article fixing device 102 of Embodiment 3 can suppress the increase in torque required to tighten the tapping screws 3 due to twisting of the bosses 4. Furthermore, the article fixing device 102 of Embodiment 3 can increase the strength of the bosses 4 against torque without increasing the thickness from the conventional bosses 200, or installing outer circumferential reinforcing ribs 9 that are taller than the conventional outer circumferential reinforcing ribs 200a.

[0050] Furthermore, when forming the conventional outer circumferential reinforcing rib 200a shown in Figure 8A, a shrinkage force is applied to the boss 200 in the radial direction, which may cause sink marks to occur on the inner circumferential surface of the boss 200, specifically on the surface corresponding to the area where the outer circumferential reinforcing rib 200a is provided. If sink marks exist on the inner circumferential surface of the boss 200, the amount of cutting required for the tapping screw 3 will be insufficient, increasing the torque required to tighten the screw and potentially causing the tapping screw 3 to come loose due to insufficient tightening. In contrast, by adopting the above configuration, the article fixing device 102 of Embodiment 3 can suppress the shrinkage force applied to the boss 4 in the radial direction, thereby suppressing the occurrence of sink marks on the inner circumferential surface of the boss 4. Therefore, the article fixing device 102 of Embodiment 3 can suppress the increase in torque required to tighten the screw due to insufficient cutting required for the tapping screw 3, thereby suppressing the tapping screw 3 coming loose due to insufficient tightening.

[0051] Even if we consider the conventional outer circumferential reinforcing rib 200a shown in Figure 8A to protrude in a tangential direction perpendicular to each radial direction of the boss 200, the outer circumferential reinforcing rib 200a does not have a surface 9a that includes a part of the tangential extending in that tangential direction. Therefore, the conventional outer circumferential reinforcing rib 200a shown in Figure 8A is clearly different from the outer circumferential reinforcing rib 9 of Embodiment 3 shown in Figure 8B.

[0052] Furthermore, in Figure 8B, the boss 4 is the first boss 4b, and an inner circumferential reinforcing rib 7 is provided in the recess 4h formed in the tip portion 4f of the first boss 4b, and the tip portion 4f where the recess 4h is formed is configured to be tapered, but is not limited to this. That is, the outer circumferential reinforcing rib 9 can achieve the same effect regardless of the structure on the inner circumferential surface 4g side of the boss 4, and may be provided, for example, on the second boss 4d.

[0053] For example, as shown in Figure 3, the boss 4 has an action point 10 on which torque is applied and a support point 11 supported by the main body 1. When the article-side mounting portion 2 has a thick portion 2a and a thin portion 2b, as shown in Figure 3, the distance between the action point 10 and the support point 11 is larger for the second boss 4d, which has a mounting hole 4a corresponding to a through hole 2c provided in the thick portion 2a, compared to the first boss 4b, which has a mounting hole 4a corresponding to a through hole 2c provided in the thin portion 2b. As the distance between the action point 10 and the support point 11 increases, the stress decreases and the displacement increases, so the torsion due to torque is greater for the second boss 4d than for the first boss 4b. Therefore, when tightening the tapping screw 3 with the same torque, the difference in the distance between the action point 10 and the support point 11 will cause a difference in the torque when tightening the tapping screw 3, which may result in insufficient tightening of the tapping screw 3. However, by adopting the above configuration, the article fixing device 102 of Embodiment 3 has increased strength of the boss 4 against torque, which suppresses deformation due to twisting of the boss 4 and prevents insufficient tightening of the tapping screws 3.

[0054] (Note 1) Multiple cylindrical bosses, each having a mounting hole, are provided on the main body. An article mounting portion to be attached to the main body, comprising a thick-walled portion and a thin-walled portion less thick than the thick-walled portion, wherein the thick-walled portion and the thin-walled portion are provided with a plurality of through holes corresponding to the mounting holes of the plurality of bosses, Multiple tapping screws, each having the same length, are inserted from the through-hole side into the mounting holes of the multiple bosses, which are arranged opposite each of the multiple through-holes, and fix the article-side mounting portion to the multiple bosses. Equipped with, Each of the aforementioned bosses has a mounting hole corresponding to a through hole provided in the thin-walled portion and a mounting hole corresponding to a through hole provided in the thick-walled portion, both having the same inner diameter. Of the aforementioned plurality of bosses, the boss having a mounting hole corresponding to the through hole provided in the thin-walled portion is formed to a depth proportional to the thickness of the thick-walled portion and has a recess on the inner circumferential surface side of the tip portion with an inner diameter larger than the diameter of the tapping screw. The screwing depth of each of the aforementioned tapping screws into the aforementioned bosses is the same. An article fixing device, An inner circumferential surface reinforcing rib is provided in the recess formed at the tip, the distance to the center of the boss diameter is greater than the radius of the tapping screw, and the rib protrudes from the inner circumferential surface of the recess in the radial direction of the boss, An article fixing device further equipped with the following features. (Note 2) Multiple cylindrical bosses, each having a mounting hole, are provided on the main body. An article mounting portion to be attached to the main body, comprising a thick-walled portion and a thin-walled portion less thick than the thick-walled portion, wherein the thick-walled portion and the thin-walled portion are provided with a plurality of through holes corresponding to the mounting holes of the plurality of bosses, Multiple tapping screws, each having the same length, are inserted from the through-hole side into the mounting holes of the multiple bosses, which are arranged opposite each of the multiple through-holes, and fix the article-side mounting portion to the multiple bosses. Equipped with, Each of the aforementioned bosses has a mounting hole corresponding to a through hole provided in the thin-walled portion and a mounting hole corresponding to a through hole provided in the thick-walled portion, both having the same inner diameter. Of the aforementioned plurality of bosses, the boss having a mounting hole corresponding to the through hole provided in the thin-walled portion is formed to a depth proportional to the thickness of the thick-walled portion and has a recess on the inner circumferential surface side of the tip portion with an inner diameter larger than the diameter of the tapping screw. The screwing depth of each of the aforementioned tapping screws into the aforementioned bosses is the same. An article fixing device, The tip portion in which the recess is formed is tapered. Article fixing device. (Note 3) The tip portion in which the recess is formed is tapered. The article fixing device described in Appendix 1. (Note 4) An outer surface reinforcing rib provided on the outer surface side of the plurality of bosses, projecting in a tangential direction perpendicular to the radial direction of each of the plurality of bosses, and having a surface that includes a part of the tangential extending in the tangential direction, An article fixing device according to any one of the appendices 1 to 3, further comprising the following: (Note 5) The outer peripheral reinforcing ribs are joined to the wall surface of the main body. The article fixing device described in Appendix 4. (Note 6) An inner circumferential surface reinforcing rib is provided in the recess formed at the tip, the distance to the center of the boss diameter is greater than the radius of the tapping screw, and the rib protrudes from the inner circumferential surface of the recess in the radial direction of the boss, Furthermore, The cross-sectional area of ​​the inner circumferential reinforcing rib in the radial direction of the boss is triangular. An article fixing device as described in any one of the items from Appendix 1 to Appendix 5. [Explanation of symbols]

[0055] 100, 101, 102 Article fixing device, 1 Main body, 1a Wall surface of the main body, 2 Article side mounting part, 2a Thick part, 2b Thin part, 2c Through hole, 2d First location, 2e Second location, 2f Third location, 3 Tapping screw, 4 Boss, 4a Mounting hole, 4b First boss, 4c Inner diameter of the part of the mounting hole of the first boss into which the tapping screw is inserted, 4d Second boss, 4e Inner diameter of the part of the mounting hole of the second boss into which the tapping screw is inserted, 4f Tip, 4g Inner circumferential surface of the tip, 4h Recessed part, 4i Outer circumferential surface, 4k Radius of the part of the mounting hole of the first boss into which the tapping screw is inserted, 5 Screwing depth of the tapping screw inserted into the mounting hole of the first boss, 6 Screwing depth of the tapping screw inserted into the mounting hole of the second boss, 7 Inner circumferential surface reinforcing rib, 7a 8 Distance from the inner circumferential reinforcing rib to the center of the boss diameter, 9 Inner diameter of the part of the tapered tip that is located on the main body side, 9 Outer circumferential reinforcing rib, 9a Surface including a part of the tangential extending in the tangential direction, 10 Point of action, 11 Point of support, 200 Boss with a conventional structure, 200a Conventional outer circumferential reinforcing rib

Claims

1. Multiple cylindrical bosses provided on the main body, each having a mounting hole, An article mounting portion to be attached to the main body, comprising a thick-walled portion and a thin-walled portion less thick than the thick-walled portion, wherein the thick-walled portion and the thin-walled portion are provided with a plurality of through holes corresponding to the mounting holes of the plurality of bosses, Multiple tapping screws, each having the same length, are inserted from the through-hole side into the mounting holes of the multiple bosses, which are arranged opposite each of the multiple through-holes, and fix the article-side mounting portion to the multiple bosses. Equipped with, Each of the aforementioned bosses has a mounting hole corresponding to a through hole provided in the thin-walled portion and a mounting hole corresponding to a through hole provided in the thick-walled portion, both having the same inner diameter. Of the aforementioned plurality of bosses, the boss having a mounting hole corresponding to the through hole provided in the thin-walled portion is formed to a depth proportional to the thickness of the thick-walled portion and has a recess on the inner circumferential surface side of the tip portion with an inner diameter larger than the diameter of the tapping screw. The screwing depth of each of the aforementioned tapping screws into the aforementioned bosses is the same. An article fixing device, An inner circumferential surface reinforcing rib is provided in the recess formed at the tip, the distance to the center of the boss diameter is greater than the radius of the tapping screw, and the rib protrudes from the inner circumferential surface of the recess in the radial direction of the boss, An article fixing device further equipped with the following features.

2. Multiple cylindrical bosses provided on the main body, each having a mounting hole, An article mounting portion to be attached to the main body, comprising a thick-walled portion and a thin-walled portion less thick than the thick-walled portion, wherein the thick-walled portion and the thin-walled portion are provided with a plurality of through holes corresponding to the mounting holes of the plurality of bosses, Multiple tapping screws, each having the same length, are inserted from the through-hole side into the mounting holes of the multiple bosses, which are arranged opposite each of the multiple through-holes, and fix the article-side mounting portion to the multiple bosses. Equipped with, Each of the aforementioned bosses has a mounting hole corresponding to a through hole provided in the thin-walled portion and a mounting hole corresponding to a through hole provided in the thick-walled portion, both having the same inner diameter. Of the aforementioned plurality of bosses, the boss having a mounting hole corresponding to the through hole provided in the thin-walled portion is formed to a depth proportional to the thickness of the thick-walled portion and has a recess on the inner circumferential surface side of the tip portion with an inner diameter larger than the diameter of the tapping screw. The screwing depth of each of the aforementioned tapping screws into the aforementioned bosses is the same. An article fixing device, The tip portion in which the recess is formed is tapered. Article fixing device.

3. The tip portion in which the recess is formed is tapered. The article fixing device according to claim 1.

4. An outer surface reinforcing rib provided on the outer surface side of the plurality of bosses, projecting in a tangential direction perpendicular to the radial direction of each of the plurality of bosses, and having a surface that includes a part of the tangential extending in the tangential direction, The article fixing device according to any one of claims 1 to 3, further comprising:

5. The outer peripheral reinforcing ribs are joined to the wall surface of the main body. The article fixing device according to claim 4.

6. The cross-sectional area of ​​the inner circumferential reinforcing rib in the radial direction of the boss is triangular. The article fixing device according to claim 1.

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