JPS601482B2 - push lily bet - Google Patents

Description

[Detailed description of the invention] This invention relates to push rivets.

This type of push rivet has been widely used for attaching plate materials such as printed circuit boards to product chassis.

This rivet consists of a female rivet and a male rivet, and the female rivet has a top shaped like a flat flange, the tip of which is narrowed inward, and slits are formed at multiple locations around the circumference. The male rivet is made of an elastic body with a generally hollow cylindrical shape, and the male rivet has a roughly cylindrical shape with a flange on the head, and is used by being combined into one body with the two parts shallowly iron-bonded. . When attaching two plates using push rivets like this, conventionally, the male and female rivets formed in both plates are aligned, and the male and female rivets in the above combination are integrated into the pet holes. After inserting troops, against the female rivet. The female rivet and male rivet are fixed by pushing the male rivet and expanding a slit formed at the tip of the female rivet with the tip of the male rivet, thereby connecting and fixing the two plate materials. However, the cross-sectional shape of the tip of the male rivet in conventional push rivets is simply circular, so
Although it is easy to attach the two plates, the male rivet firmly engages with the tip of the female rivet during installation, so once the plates are fixed, it is extremely difficult to remove the two rivets. In order to remove this, there was a drawback that in extreme cases the push rivet itself had to be completely destroyed.

Therefore, when this kind of conventional push rivet is applied to attach a printed circuit board, for example, various electronic components are mounted on the printed circuit board at high density, and the chassis wall surface is close to the push rivet mounting position. Once installed, it is extremely difficult to remove it, which may inadvertently damage surrounding electronic components, and may require inspection of the circuit formed on the printed circuit board. A problem arises in which it becomes impossible to do so.

This invention makes it possible to easily and reliably connect and separate two plate-like members, such as a printed circuit board and a chassis, and furthermore, the recombination after separating the two plate-like members prevents the connected parts from becoming separated or lost. The purpose is to make it quick, easy, and efficient.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

Figures 1 to 4 show an example of the push rivet according to the present invention. Figure 1 is a front sectional view of the push rivet, Figure 2 is a bottom view, and Figure 3 is a cross-sectional view of the push rivet. The side sectional view, FIG. 4, is a sectional view taken along line mm in FIG. 3.

This push rivet has 2 female rivets and 3 male rivets.
It consists of a pair of upper and lower parts.

The female rivet 2 is made of an elastic plastic material or the like, has a substantially cylindrical shape with a hollow interior, and has a top portion 2a shaped like a flat plate flange, and a tip tapered inward at multiple points at predetermined intervals in the circumferential direction. Slits 4, 4 of a predetermined width are formed in the longitudinal direction (in two locations at 180 degree intervals in the figure) with a predetermined length. Top 2 of this female rivet
Below a, the diameter has been reduced to a slightly smaller size to facilitate the installation work when installing the printed circuit board on the chassis.
A stepped portion 2b is formed. On the other hand, male rivet 3 is
It is made of the same material as the female rivet 2, a hard plastic material, a metal material, etc., and a flat circular flange portion 3a is formed on the head part to expand outward.
``1'' or ``10'' grooves 5 are bored in its upper surface, and it can be rotated with a tool such as a screwdriver.

This male rivet 3 has a substantially solid cylindrical shape with a diameter slightly smaller than the inner diameter of the female rivet 2, and the cross-sectional shape of its distal end 6 is narrower on one side in the radial direction than the cylindrical shape of the proximal end 7. Moreover, it is formed into a substantially elliptical shape having the same diameter as the base end portion 7 in a direction perpendicular thereto. The male rivet 3 and the female rivet 2 are used as a single unit in a shallowly joined state, and when the male rivet 3 is pushed into the female rivet 2 from above, the tip 6 of the male rivet 3 is inserted into the female rivet 2 from above. The tip of the female rivet 2 is expanded outward in conjunction with the slits 4, 4. In this embodiment, the tip 6 of the male rivet 3 is described as having an elliptical shape, but the present invention is not limited to this, and can be configured with various other shapes. It is sufficient that the tip portion 6 has a narrow width and a wide width in a predetermined cross-sectional direction, and has a shape that can correspond to the slits 4, 4 formed in the female rivet 2 and expand outward.

Next, in FIG. 5, reference numeral 10 is a chassis for an audio product, etc., and printed circuit board mounting parts 11, 11 are integrally mounted upward at a predetermined height at its four corners (only two locations are shown in the figure). A rivet hole 12 is bent and formed, and the push rivet 1 is inserted into the mounting portion 11.
is formed through it.

On the other hand, these rivet holes 1 are located at the four corners of the printed circuit board 13.
A mounting hole i4 of the push rivet 1 corresponding to the push rivet 2 is bored.

In this example, the diameter of the rivet hole 12 is larger than that of the mounting hole 14 formed in the printed circuit board, and as will be described later, when the male rivet 3 is pushed into the female rivet 2, its tip 6 The diameter is set in advance to be slightly larger than the diameter of the tip 2c of the female rivet, which is enlarged due to competition with the slits 4, 4.

Next, the order of attaching the printed circuit board 13 to the chassis 10 using the present push rivet having the above configuration will be explained.

It goes without saying that various electronic components are mounted and arranged on the front surface of this printed circuit board 13, and a circuit pattern is formed on the back surface thereof.

First, with the female rivet 2 and male rivet 3 assembled together as described above, when the push rivet 1 is inserted into the mounting hole 14 of the board 13 as shown in FIGS. 5 and 6, the top of the female rivet 2 The female rivet 2 is fixedly held in the mounting hole 14 of the substrate 13 with the substrate 13 sandwiched between the step portion 2a and the stepped portion 2b.

At this time, the top portion 2a is positioned and locked at the peripheral edge of the attachment hole 14, and is prevented from coming off downwardly. Incidentally, a circuit pattern is generally formed in the vicinity of the mounting hole 14 of the printed circuit board 13, so in this example, an insulating member 15 such as an insulating ring is interposed between the chassis 10 and the printed circuit board 13. It is designed to be inserted.

This insulating member 16 has a push rivet 1 attached to the mounting hole 14.
When inserting the drum into the board 1, it is inserted into the female rivet 2 at the same time.
It can be installed below the mounting hole 3. As a result, as shown in FIG. 6, the top 2 of the female rivet 2
The female rivet 2 is held with the printed circuit board 13 and the insulating member 15 sandwiched between the step portion 2b and the step portion 2b. According to this, after positioning and remounting the insulating member 15 on the mounting portion 11 of the chassis, as in the conventional case, positioning and installing the board,
The complication of having to perform the installation work while aligning the two mounting layers is eliminated, and as described later, the installation of the insulating member can be done at the same time as the operation of inserting the push rivet into the board, making the installation easier. There is. Next, when the male rivet 3 is pushed downward into the female rivet 3 from the position shown in FIG. 2 elastically expands the tip 2c outward (see FIG. 7).

At this time, since the outer diameter of the tip portion 2c in the expanded state is set to be smaller than the diameter of the rivet hole 12 of the mounting portion 11, there is a gap 17 between the two, as shown in FIG. Therefore, the printed circuit board 13 and the chassis 10 are not connected and fixed, and the circuit board 13 is in a state where it can be removed from the rivet hole 12 of the mounting portion 11 together with the push rivet 1. Furthermore, the male rivet tip 6
The wide direction of the slits 4 is substantially parallel to the slits 4, 4. Thereafter, when the concave groove 5 formed in the flange portion 3a of the male rivet is rotated using a screwdriver or the like from the state shown in FIG.
As shown by arrow 18 in FIG. 7, it rotates 1'4 times in a predetermined direction, that is, about 90 degrees. In this case, for example, if a dowel mark is provided on the top 2a of the female rivet or the like at a predetermined position in the direction of rotation of the male rivet, and matches the groove 5, alignment of the male rivet 3 in the direction of rotation can be made easier. It can be carried out. (Please mark this mark on the male rivet tip 6.
If the slits 4 and 4 of the female rivet correspond to each other, and the tip 6 is provided at both the positions where the slits 4 and 4 widen, it will be possible to push the male rivet 3 and The rotation operation, that is, the mounting work of the board 13 can be performed even more easily. ) Then, the tip 6 rotates from the above-mentioned parallel state to a state substantially perpendicular to the slits 4 in the direction of enlarging the slits 4, 4, and the tip 2c of the female rivet 2 is rotated through the slits 4, 4. From the state shown in FIG. 7, the male rivet tip 6 can be elastically closed further outward by a distance corresponding to the major axis of the wide portion (see FIG. 8).
As a result, the lower outer peripheral wall of the stepped portion 2b of the female rivet 2 is strongly pressed against the lower edge of the rivet hole 12, as shown by the arrow 19 in FIG. At the same time, the rivet 1 is firmly fixed and held in the rivet hole 12, and as a result, the push rivet 1 secures the printed circuit board 1.
3 is completely fixed to the mounting portion 11 of the chassis 10 via the insulating member 15. On the other hand, in order to remove the printed circuit board 13 from the chassis mounting portion 11, use an operating tool such as a screwdriver to rotate the groove 5 in the opposite direction from the state shown in FIG. When operated, male rivet 3 rotates 1/4 turn, that is, 90 degrees, and
At the same time as the rotation returns to the state shown in the figure, the tip 6 returns from the position perpendicular to the slits 4, 4 shown in FIG.
It elastically contracts in accordance with the difference in distance between the major axis and the minor axis.

As a result, the tip 2c of the female rivet 2 changes from the open state shown in FIG. 8 to the state shown in FIG. The push rivet is elastically returned to its original state, and the push rivet can be pulled out from the rivet hole 12 through this gap 17. As a result, the mounting portion 11 of the printed circuit board 13 and the chassis 10
The printed circuit board 13 can be removed from the chassis 10 together with the push rivets 1. At this time, in this example, since the printed circuit board 13 and the insulating member 15 are sandwiched between the top part 2a and the stepped part 2b of the female rivet 2, as described above, the printed circuit board 13 can be removed. , the push rivet 1 and the insulating member 15 are removed from the mounting portion 11 simultaneously. Thereafter, inspection work on the circuit portion formed on the board 13 is performed as appropriate. On the other hand, printed circuit board 1
3 on the chassis 10, it is sufficient to position and set the push rivet 1 and the insulating member 15 in the integrated state as shown in FIG. 7 as described above, and then use the same means as above. By rotating the male rivet 3, the printed circuit board 13 can be attached to the chassis 10 with almost one touch very easily.

In the above embodiment, the slits 4, 4 of the female rivet 2 were described as being formed at two locations with an interval of 180 degrees, but it is also possible to increase the number as appropriate.

However, in terms of obtaining the mounting strength of the push rivet 1, it is preferable to use the two locations shown in the embodiment. Furthermore, in the above embodiment, it has been explained that the male rivet 3 is rotated 1'4 times to expand or contract the tip 2c of the female rivet, but the rotation angle depends on the shape of the tip 6 of the male rivet. Alternatively, it is of course possible to select and set the angle as appropriate depending on the shape, number, etc. of the slits 4. In short, by rotating the male rivet 3, the female rivet tip can be opened through the tip 6 of the rivet 3 and the slits 4, 4. Any configuration is sufficient as long as 2c can be expanded or contracted within a predetermined range.

Furthermore, in the above embodiments, the present invention has been described with respect to the case where a printed circuit board is attached to and removed from a chassis, but the present invention is not limited to this, and may be applied to other cases, for example, between a plurality of plate-like members. It goes without saying that the present push rivet can be widely applied to cases where it is advantageous to use the present push rivet in cases where attachment and detachment are to be carried out.

As explained in detail above, in the push rivet according to the present invention, when the female rivet is inserted into the mounting holes of the two plate-like members, the male rivet is pushed into the female rivet, and the tip is inserted into the slit. The body of the female rivet is expanded to a certain first stage by the insertion force, and then when the male rivet is rotated until the long side of the tip is perpendicular to the slit, the female rivet expands further to the first stage due to the difference between the long side and the short side. The plate is expanded to a second stage, which is larger than the original size, thereby joining the two plate-like members. Additionally, when the male rivet is rotated back to the point where the long side of the tip is parallel to the slit, the female rivet shrinks to a certain level according to the difference between the longest side and the shortest side of the male rivet tip, and the two plate-like The members are made separable. Therefore, the connection and separation between the two plate-like members can be easily and easily accomplished by simply pushing the male rivet into the female rivet and rotating it by a predetermined angle. In addition, the female rivet is pushed apart in two stages, and the pushing action in the second stage joins both plate-like parts, so there is no chance of the push rivet accidentally falling off, and the bonding strength is stronger. You can get the desired results and be able to make reliable connections. Furthermore, with the two plate members uncoupled, the female rivet is inserted into the slit at the tip of the male rivet and expanded to a certain level, so the push rivet is held and held by one of the plate members. , both are separated from the other plate member in an integrated state.

Therefore, the two plate-shaped members once separated can be recombined easily and quickly without any accidental loss or separation of the push rivets. Therefore, according to the present invention, it is extremely suitable for mounting and removing printed circuit boards to and from chassis, which are mounted in high density and need to be frequently mounted and removed for inspection work of circuit parts, etc.
This has the effect of increasing the efficiency of implementation work.

[Brief explanation of the drawing]

Figures 1 to 4 show an example of the push rivet according to the present invention. Figure 1 is a front sectional view of the push rivet, Figure 2 is a bottom view, and Figure 3 is a cross-sectional view of the push rivet. The side sectional view, FIG. 4, is a sectional view taken along line mm in FIG. 3. Figure 5 is an explanatory diagram of when a printed circuit board is attached to and removed from the chassis using this push rivet, and Figures 6 to 8 are operating states when a printed circuit board is attached and removed using this push rivet. An explanatory diagram of
Figure 6 shows the push rivet inserted into the mounting hole of the printed circuit board, Figure 7 shows the tip of the male rivet aligned with the slit of the female rivet, and Figure 8 shows the push rivet inserted into the mounting hole of the printed circuit board. FIG. 4 is an explanatory diagram showing a state in which the installation of the printed circuit board completely fixed between the chassis and the chassis is completed. 2a...Top, 4,4...Slit, 2...・Female rivet, 3a...
Head, 3...Male rivet, 6...Tip, 5
... Concave groove (rotation operation means). Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Scope of Claims] 1. A female rivet 2 having a flange portion on the top portion 2a and having an internally hollow cylindrical shape with the tip tapered inward and slits 4 formed at multiple locations in the circumferential direction, and a head portion 3a. It is composed of a male rivet 3 which has a flange portion on the side and is approximately cylindrical in shape, and which is pressed into the female rivet 2 and combined with the male rivet 3. When inserted into the slit 4, the female rivet 2 is pushed out to a certain first stage by the insertion force, and the male rivet 3 is rotated until the long side of the tip is perpendicular to the slit 4. A push rivet characterized in that the female rivet 2 can be pushed and expanded to a second stage larger than the first stage according to the difference between the long side and the short side. 2. The push rivet according to claim 1, wherein the cross section of the tip end 6 of the male rivet 3 is formed into a substantially elliptical shape. 3. The push rivet according to claim 1 or 2, wherein a rotation operation means 5 is formed on the head of the male rivet 3. 4. The push rivet according to claim 3, wherein the rotation operation means 5 is a "-" or "+" groove.