Cover fitting structure and cover fitting method

Abstract

To provide a cover fitting structure that makes it possible to prevent the rotation of the cover when securing it with screws and improve a user's ease of work.SOLUTION: The cover fitting structure comprises: a substrate 2 on which an electronic component 3 is mounted; a fixing member 7 having at least two bosses 6 vertically arranged on the substrate 2, and a female thread section 8 at the tip of the boss 6 and a male thread section 9a; and a cover 4 secured to the boss 6. The cover 4 has a first fixing part 12, and a second fixing part 13 including a rotation stopping structure 18. The second fixing part 13 includes a second through-hole 15, and a plurality of vibration pieces 16, 17 where the pore wall of the second through-hole 15 serves as a vibration edge. The fixing member 7 has a flat washer 11 (head) that is larger than the second through-hole 15. The second fixing part 13 is located between the flat washer 11 and the substrate 2.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a cover mounting structure and a cover mounting method for covering electronic components mounted on a circuit board of an electronic device. [Background technology]

[0002] Conventionally, covers are sometimes provided on the circuit boards of electronic devices to cover the electronic components, in order to protect the electronic components, prevent workers from touching the electronic components that generate heat, prevent workers from getting electric shocks, and provide static insulation. An example of this type of cover is described in Patent Document 1. The cover disclosed in Patent Document 1 is formed to shield electronic components on a board, and is fixed to the board with a plurality of screw members. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-27416 Summary of the Invention [Problem to be solved by the invention]

[0004] When a cover for an electronic component is attached to a circuit board, it is often secured by screws at least at two ends of the cover. In this cover attachment structure, when the first screw is tightened, a rotational force is transmitted from the screw to the cover, causing the cover to rotate in the same direction. To prevent this rotation from damaging the electronic component, the cover must be held down while the screw is tightened. In other words, with conventional cover attachment structures, the screw must be tightened and the cover held down simultaneously, resulting in poor workability during the cover attachment process.

[0005] An object of the present invention is to provide a cover mounting structure and a cover mounting method that can prevent the cover from rotating when fastening screws and improve the user's workability. [Means for solving the problem]

[0006] In order to achieve this object, the cover mounting structure of the present invention comprises a substrate on which an electronic component is mounted, at least two bosses erected on the substrate, female threaded portions formed at the tips of the bosses, fixing members having male threaded portions that are screwed into the female threaded portions, and a sheet-like cover fixed to the bosses by a plurality of the fixing members in a state in which the cover covers the electronic component, wherein the cover has a rotation prevention structure, in which a first fixing portion is fixed to a first boss that is one of the at least two bosses by the fixing member, and a second boss that is the other boss by the fixing member. the first fixing portion has a first through hole through which only the male thread portion of the fixing member can be inserted, the second fixing portion includes a second through hole formed so that the second boss can be inserted to form the anti-rotation structure, and a plurality of swing pieces that swing so that the hole wall of the second through hole becomes a swing end, the fixing member that fixes the second fixing portion to the second boss has a head that is larger than the second through hole when viewed from the axial direction of the second boss, and the second fixing portion is disposed between the head of the fixing member screwed into the second boss and the substrate.

[0007] In the cover mounting structure of the present invention, the plurality of rocking pieces may be formed so as to be aligned on either side of a plurality of cutouts that are tangent to the second through hole.

[0008] In the cover mounting structure of the present invention, the multiple oscillating pieces may be arranged at predetermined intervals around the circumferential direction of the second through hole, and notches extending radially from the center of the second through hole may be formed between the oscillating pieces.

[0009] The present invention is a cover mounting method for mounting the cover to the boss in the cover mounting structure, which is carried out by a first step of screwing the fixing member into the second boss, a second step of bending the oscillating piece to insert the second boss into the second through hole, and a third step of fixing the first fixing part to the first boss with the fixing member. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a cover mounting structure and a cover mounting method that can prevent the cover from rotating when fastening screws and improve workability for the user. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view of an assembly showing a first embodiment of a cover mounting structure according to the present invention. [Figure 2] FIG. 2 is an exploded perspective view of the cover mounting structure. [Figure 3] FIG. 3 is a plan view of the cover. [Figure 4] FIG. 4 is a flowchart for explaining a method for attaching the cover. [Figure 5] FIG. 5 is a perspective view showing a state in which the fixing member is screwed into the boss. [Figure 6] FIG. 6 is a perspective view showing a state in which the rocking piece is bent. [Figure 7] FIG. 7 is a perspective view showing a state in which the fixing member is inserted into the second through-hole. [Figure 8] FIG. 8 is a cross-sectional view showing the fixed state of the second fixing portion. [Figure 9] FIG. 9 is a cross-sectional view showing the fixed state of the first fixing portion. [Figure 10] FIG. 10 is a perspective view of an assembly showing a second embodiment of the cover mounting structure according to the present invention. [Figure 11] FIG. 11 is an exploded perspective view of the cover mounting structure. [Figure 12] FIG. 12 is an enlarged plan view showing the second fixing portion of the cover. [Figure 13] FIG. 13 is a perspective view showing a state in which the fixing member is screwed into the boss. [Figure 14] FIG. 14 is a perspective view showing a state in which the rocking piece is bent. [Figure 15] FIG. 15 is a perspective view showing a state in which the rocking piece is inserted under the head of the fixing member. DETAILED DESCRIPTION OF THE INVENTION

[0012] (First embodiment) DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A cover mounting structure and a cover mounting method according to an embodiment of the present invention will be described in detail below with reference to FIGS. The assembly 1 shown in Fig. 1 has electronic components 3 mounted on a substrate 2, which is depicted at the bottom of the figure, and a sheet-like cover 4 attached to cover the electronic components 3. Although not shown in detail, the electronic components 3 include components that use high voltages, components that become hot, and components that have low resistance to static electricity.

[0013] The electronic component 3 is covered with a cover 4 to prevent, for example, users or workers from touching the electronic component 3, to protect the electronic component 3, to prevent contact with the electronic component 3 that generates heat, to prevent electric shock, and to provide static insulation. The cover 4 is formed from an insulating, elastically deformable plastic sheet material, and is attached to the substrate 2 by a cover attachment structure 5 according to the present invention.

[0014] As shown in Fig. 2, the cover mounting structure 5 according to this embodiment is a structure in which the cover 4 is placed on two bosses 6, 6 erected on the substrate 2 and fixed with two fixing members 7. The number of bosses 6 is not limited to two. In other words, the cover 4 can be fixed to the substrate 2 at two or more locations by the bosses 6 and fixing members 7, respectively.

[0015] The substrate 2 is formed in a rectangular shape in a plan view. A boss 6 is provided at each end of the substrate 2 in the longitudinal direction, on one diagonal line. The boss is formed in the shape of a hexagonal pillar and is fixed upright on the substrate 2 so as to be perpendicular to the substrate 2. A female screw portion 8 is formed at the tip of the boss 6 on the side opposite the substrate 2. In the following, to distinguish between the two bosses 6, one boss 6 located on the upper left side in FIG. 2 will be referred to as the first boss 6a, and the other boss 6 located on the lower right side will be referred to as the second boss 6b.

[0016] The fixing member 7 is composed of a screw member 9, a spring washer 10, and a plain washer 11. The screw member 9 has an externally threaded portion 9a and a head portion 9b. The spring washer 10 is disposed between the plain washer 11 and the head portion 9b of the screw member 9. The externally threaded portion 9a of the screw member 9 is formed to screw into the internally threaded portion 8 of the boss 6.

[0017] The cover 4 according to this embodiment is formed in a rectangular plate shape in a plan view so as to be large enough to cover the electronic components 3 on the substrate 2 from above. The cover 4 has a first fixing portion 12 and a second fixing portion 13 at both longitudinal ends, on a diagonal line that diagonally crosses the cover 4 in a plan view. The first fixing portion 12, located on the left side in FIG. 2, has a first through hole 14. The first through hole 14 is formed so that only the male thread portion 9a of the fixing member 7 can be inserted therethrough. The opening shape of the first through hole 14 is a perfect circle, as shown in FIG. 3. The first fixing portion 12 is fixed to the first boss 6a, which is one of the two bosses 6, by the fixing member 7.

[0018] As shown in FIG. 3, the second fixing portion 13 is composed of a second through-hole 15 that penetrates the cover 4 and a plurality of rocking pieces 16, 17. The second through-hole 15 is a hole that constitutes the anti-rotation structure 18 (see FIG. 8), and is formed so that the second boss 6b can be inserted therethrough. The opening shape of the second through-hole 15 is a perfect circle as shown in FIG. 3. The outer diameter of the flat washer 11 of the fixing member 7 is larger than that of the second through-hole 15 when viewed from the axial direction of the second boss 6b, as shown by the two-dot chain line in FIG. 3. In this embodiment, the flat washer 11 corresponds to the "head of the fixing member" as defined in the present invention.

[0019] The rocker piece 16 is formed in an L-shape that includes one corner of the cover 4. Hereinafter, this rocker piece 16 will be referred to as the "first rocker piece 16" to distinguish it from the other rocker piece 17. The other rocker piece 17 is provided further inward of the cover 4 than the first rocker piece 16. Hereinafter, this other rocker piece 17 will be referred to as the "second rocker piece 17." The first and second rocking pieces 16 and 17 are formed to be aligned on either side of a first cutout 19 and a second cutout 20 that are tangent to the second through-hole 15. The first and second rocking pieces 16 and 17 formed in this manner are capable of rocking so that the wall of the second through-hole 15 becomes the rocking end.

[0020] The first cutout 19 extends in the longitudinal direction of the cover 4 between the second through-hole 15 and a first edge 4a extending in the longitudinal direction of the cover 4, and divides a part of the cover 4 in the width direction perpendicular to the longitudinal direction of the cover 4. One end of the first cutout 19 is connected to the second through-hole 15, and the other end is connected to the small hole 21. The small hole 21 is formed so that the opening shape is circular, and penetrates the cover 4 in the thickness direction. The second cutout 20 extends in the width direction of the cover 4 between the second through-hole 15 and the second edge 4b ​​extending in the width direction perpendicular to the longitudinal direction of the cover 4, and divides a part of the cover 4 in the longitudinal direction of the cover 4. One end of the second cutout 20 is connected to the second through-hole 15, and the other end is connected to the small hole 22. The small hole 22 is formed so that the opening shape is circular, and penetrates the cover 4 in the thickness direction. By forming the first and second cutouts 19, 20 in the cover 4 in this manner, the first rocking piece 16 and the second rocking piece 17 can be rocked individually in the thickness direction of the cover 4 relative to the other parts of the cover 4.

[0021] Next, a method for attaching the cover 4 configured as described above to the substrate 2 will be described with reference to the flowchart in Fig. 4. To attach the cover 4 to the substrate 2, first, as shown in Fig. 5, the fixing member 7 is screwed into the second boss 6b (first step). Next, the cover 4 is placed on top of the electronic component 3, and the second fixing portion 13 of the cover 4 is brought close to the fixing member 7 on the second boss 6b, and the second fixing portion 13 is pressed against the fixing member 7 from above with the head 9b of the screw member 9 inserted into the second through hole 15, as shown in Fig. 6.

[0022] At this time, for example, as shown in Fig. 6, with the second rocking piece 17 resting on the fixed member 7, the first and second rocking pieces 16, 17 are rocked so that the first rocking piece 16 gets under the plain washer 11, thereby widening the gap S between the first rocking piece 16 and the second rocking piece 17. Then, as shown in Fig. 7, the second rocking piece 17 is elastically deformed so that the plain washer 11, spring washer 10, and head 9b of the screw member 9 of the fixed member 7 are inserted into this gap S, and the second rocking piece 17 is inserted below the plain washer 11 (second step S2).

[0023] 8, by inserting the second rocking piece 17 below the plain washer 11, the second boss 6b is inserted into the second through-hole 15. In this state, the second fixing portion 13 is disposed between the head (plain washer 11) of the fixing member 7 screwed into the second boss 6b and the substrate 2. By inserting the second boss 6b into the second through-hole 15 in this manner, an anti-rotation structure 18 that is prevented from coming off by the fixing member 7 is realized.

[0024] Thereafter, first fixing portion 12 of cover 4 is placed on first boss 6a, and another fixing member 7 inserted into first through-hole 14 is screwed into female thread portion 8 of first boss 6a. At this time, as shown in FIG. 9 , first fixing portion 12 is placed on the upper surface of first boss 6a and is pressed from above by flat washer 11 of fixing member 7, thereby fixing it to first boss 6a. When screw member 9 is screwed in with flat washer 11 in contact with first fixing portion 12, rotational force is transmitted from flat washer 11 to first fixing portion 12.

[0025] However, at this time, the second boss 6b is inserted into the second through-hole 15 of the second fixing portion 13 of the cover 4 and is prevented from rotating, so the cover 4 will not rotate. When the fixing member 7 is screwed into the first boss 6a, the first fixing portion 12 is fixed to the first boss 6a in a state where it is sandwiched between the flat washer 11 and the first boss 6a, as shown in Fig. 9 (third step S3). When the first fixing portion 12 is fixed to the first boss 6a in this way, the cover 4 is fixed to the board 2 via the first and second bosses 6a and 6b. Therefore, according to this embodiment, it is possible to provide a cover mounting structure and a cover mounting method that can prevent the cover 4 from rotating when fixing the screws, thereby improving the user's workability.

[0026] To prevent the second fixing portion 13 from floating and coming off the second boss 6b when the second fixing portion 13 is used to prevent rotation, a screw member (not shown) with a diameter larger than the diameter of the second through-hole 15 can be used. Such a screw member is specially manufactured and expensive. As shown in this embodiment, by elastically deforming the first and second rocking pieces 16, 17 and inserting them below the flat washer 11 of the fixing member 7, the fixing member 7 can prevent the cover 4 from floating. The same fixing member 7 that fixes the first fixing portion 12 to the first boss 6a can be used to fix the second fixing portion 13 to the second boss 6b. In other words, it is possible to use the fixing member 7, which is a commonly available, inexpensive part.

[0027] The multiple rocking pieces (first rocking piece 16, second rocking piece 17) according to this embodiment are formed to be lined up on either side of multiple notches 19, 20 that are tangent to second through-hole 15. Therefore, when first and second rocking pieces 16, 17 rock, the effective hole diameter of second through-hole 15 expands, allowing the head (flat washer 11) of fixing member 7 to easily pass through, thereby facilitating the prevention of rotation.

[0028] (Second embodiment) The cover mounting structure according to the present invention can be configured as shown in Figures 10 to 15. In these figures, the same or equivalent members as those described with reference to Figures 1 to 9 are designated by the same reference numerals, and detailed description thereof will be omitted where appropriate. The cover mounting structure 31 shown in FIG. 10 is the same as that of the first embodiment except for the configuration of the second fixing portion 13 of the cover 4.

[0029] 12, the second fixing portion 13 of the cover 4 according to this embodiment has a plurality of third rocking pieces 32 arranged at predetermined intervals in the circumferential direction of the second through-hole 15. In this embodiment, four third rocking pieces 32 are formed on the second fixing portion 13. Between adjacent third swing pieces 32, notches 33 are formed extending radially from the center of the second through-hole 15. By forming the notches 33 in this way in the second fixed portion 13, four third swing pieces 32 are formed that can swing so that the hole wall of the second through-hole 15 becomes the swing end.

[0030] The innermost portion of the notch 33 in this embodiment is formed in an arc shape in a plan view. The center of this arc coincides with the center of the second through hole 15. Furthermore, the innermost portion of the notch 33 is formed so as to be located radially outward of the flat washer 11 of the fixing member 7 that is screwed onto the second boss 6b when the second through hole 15 is positioned coaxially with the second boss 6b.

[0031] In the cover mounting structure 31 according to this embodiment, the method for mounting the cover 4 to the first and second bosses 6a, 6b is the same as that in the first embodiment. That is, first, the fixing member 7 is screwed into the second boss 6b as shown in Fig. 13. Then, the fixing member 7 is pushed into the second through-hole 15 by pressing the second fixing portion 13 of the cover 4 against the fixing member 7 on the second boss 6b. When the fixing member 7 is pushed into the second through-hole 15, the four third swing pieces 32 bend and swing as shown in Fig. 14, and the opening edge of the second through-hole 15 is pushed up by the fixing member 7.

[0032] By further pressing the second fixed portion 13 toward the second boss 6b while the third rocking piece 32 is bent in this manner, the amount of bending (amount of rocking) of the third rocking piece 32 increases, and the effective diameter of the second through-hole 15 increases. Then, the plain washer 11 passes between the third rocking pieces 32, and as shown in Fig. 15, the third rocking piece 32 is inserted below the plain washer 11 of the fixed member 7. As a result, the second boss 6b is inserted into the second through-hole 15, and an anti-rotation structure 18 that is prevented from coming off by the fixed member 7 is realized. Therefore, in this embodiment as well, it is possible to provide a cover mounting structure and a cover mounting method that can prevent the cover 4 from rotating when fastening the screws, thereby improving the user's workability.

[0033] The multiple rocking pieces (third rocking pieces 32) according to this embodiment are arranged at predetermined intervals in the circumferential direction of the second through hole 15. Notches 33 extending radially from the center of the second through hole 15 are formed between the third rocking pieces 32. Therefore, simply pressing the second fixed portion 13 against the fixed member 7 causes the third rocking pieces 32 to bend, thereby realizing the anti-rotation structure 18, and thus preventing rotation can be easily achieved.

[0034] The method of attaching the cover according to the first and second embodiments described above is a method that includes a first step S1 of screwing the fixing member 7 into the second boss 6b, a second step S2 of bending the oscillating pieces (first to third oscillating pieces 16, 17, 32) and inserting the second boss 6b into the second through hole 15, and a third step S3 of fixing the first fixing portion 12 to the first boss 6a with the fixing member 7. Therefore, the cover 4 can be attached with at least two screw fastening operations, and therefore the attachment operation of the cover 4 can be completed in a short time. [Explanation of symbols]

[0035] 1... assembly, 2... circuit board, 3... electronic component, 4... cover, 5, 31... cover mounting structure, 6... boss, 6a... first boss, 6b... second boss, 7... fixing member, 8... female thread portion, 9a... male thread portion, 11... plain washer (head), 12... first fixing portion, 13... second fixing portion, 14... first through hole, 15... second through hole, 16... first rocking piece, 17... second rocking piece, 18... anti-rotation structure, 19... first cutout portion, 20... second cutout portion, 32... third rocking piece, 33... notch, S1... first step, S2... second step, S3... third step.

Claims

1. A substrate on which electronic components are mounted; At least two bosses provided on the substrate; a female thread portion formed at a tip end of the boss; a fixing member having a male thread portion that is screwed into the female thread portion; a sheet-like cover fixed to the boss by a plurality of the fixing members in a state of covering the electronic component, the cover has a first fixing portion fixed by the fixing member to a first boss that is one of the at least two bosses, and a second fixing portion fixed by the fixing member to a second boss that is the other boss and includes a rotation prevention structure; the first fixing portion has a first through-hole through which only the male thread portion of the fixing member can be inserted, the second fixing portion includes a second through hole into which the second boss is inserted to form the anti-rotation structure, and a plurality of swing pieces that swing so that a hole wall of the second through hole becomes a swing end portion, the fixing member that fixes the second fixing portion to the second boss has a head that is larger than the second through hole when viewed in the axial direction of the second boss, A cover mounting structure, characterized in that the second fixing portion is disposed between the head of the fixing member screwed into the second boss and the substrate.

2. The cover mounting structure according to claim 1, A cover mounting structure, characterized in that the plurality of rocking pieces are formed so as to be aligned on either side of a plurality of notches that are tangent to the second through hole.

3. The cover mounting structure according to claim 1, A cover mounting structure characterized in that the multiple oscillating pieces are arranged at predetermined intervals around the circumferential direction of the second through hole, and notches extending radially from the center of the second through hole are formed between the oscillating pieces.

4. 2. A cover mounting method for mounting the cover to the boss in the cover mounting structure according to claim 1, comprising: a first step of threading the fixing member onto the second boss; a second step of bending the rocking piece to insert the second boss into the second through hole; and a third step of fixing the first fixing portion to the first boss by the fixing member.

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