JPH08128424A - Rivet for attaching printed board - Google Patents

Abstract

PURPOSE: To achieve facilitation of assembly with a small number of parts by forming cylindrical rivet parts on a spacer part provided with stem through holes, and pinching printed boards through a process of extending the diameters of the rivets by the head parts of the stems penetrating the rivet part inner diameter. CONSTITUTION: In attaching of printed boards 1, 3, rivet parts 25, 27 of a printed board attaching rivet 45 are respectively inserted through rivet part through holes 29, 31 provided on four corners of the sub printed board 3 and the main printed board 1 facing it, and projecting parts 37, 39 are inserted into projecting part insertion holes 41, 43. Stems 33 inserted through the rivet parts 25, 27 are respectively drawn in the direction of the arrows by the specified force by using a tool. When the stems 33 are drawn out, they are separated from the rivet parts 25, 27, and the head parts 33a of the stems 33 are fitted into the rivet parts 25, 27 and cut after extending the diameters of respective rivet parts 25, 27, and the main printed board 1 and the sub printed board 3 are pinched by a spacer part 15 and extended rivet parts 25, 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rivet for mounting a printed board used in an assembly structure of a printed board having a stack structure.

[0002]

2. Description of the Related Art Conventionally, in a printed board assembly structure having a stack structure, when fixing a sub printed board 3 to a main printed board 1 as shown in FIG. The spacing bolts 5 were used and were arranged at the four corners of the sub-printed board 3 and fixed by screws 7 and spring washers 9 from both sides of the main printed board 1 and the sub-printed board 3.

In the figure, 11 and 13 are screw insertion holes provided in the main printed board 1 and the sub printed board 3.

[0004]

However, in the conventional mounting structure as described above, the number of parts required for fixing the two printed boards 1 and 3 is large, and the screw 7 is prevented from loosening. The insertion of the spring washer 9 and the application of lock paint are required, so that the cost of the member and the number of assembling steps are very high, and the assembling workability is difficult.

The present invention has been devised in view of such circumstances, and in realizing a stack structure of a printed board, the number of parts is smaller than in the conventional case, and the rivet for mounting the printed board is improved. The purpose is to provide.

[0006]

In order to achieve such an object, a printed board mounting rivet according to a first aspect of the present invention is provided with two printed board 1 and 3 which are arranged facing each other with a certain space therebetween. Metal spacer parts 15 in which the parallel mandrel through holes 17 and 19 are formed, and the spacer parts 15 are respectively displaced and integrally projected on the surface of the spacer part 15 facing the printed board. Hollow cylindrical rivet parts 25 and 27 which are in communication with 17, 19 and can be inserted into rivet part insertion holes 29 and 31 provided in the printed boards 1 and 3, and a spacer part 1.
Hollows which are respectively displaced and integrally projected on the printed board facing surface of 5 and communicate with the mandrel through holes 17 and 19 and can be inserted into the convex insertion holes 41 and 43 provided on the printed boards 1 and 3, respectively. The cylindrical convex portions 37, 39 and the mandrel through holes 17, 19
Through the rivet parts 25, 27 and temporarily fixed to the rivet parts 25, 27, and the rivet parts 25, 27 are attached to one end.
A head portion 33a having an outer shape larger than the inner diameter of the rivet portion 25,
27 is the head 33 that is press-fitted when the mandrel 33 is pulled out.
It is characterized in that it is expanded in diameter a and holds the printed boards 1 and 3 together with the spacer portion 15.

The printed board mounting rivet according to a second aspect of the present invention is formed so that it can be inserted into the spacer insertion hole 49 provided in one of the printed boards 1 and 3 facing each other with a certain interval, and both the printed rivets are formed. A metallic spacer portion 47 for keeping the distance between the plates 1 and 3 and a hollow cylinder projecting integrally with the insertion-side tip of the spacer portion 47 and capable of being inserted into the rivet portion insertion hole 51 provided in the other printed board 1. A rivet portion 53, a knob portion 55 integrally formed on the rear end side of the spacer portion 47, and a mandrel through hole 61 provided in the spacer portion 47 and the knob portion 55 in communication with the rivet portion 53. The rivet part 5 is penetrated from the rivet part 53 side.
3 and a mandrel 33 having a head portion 33a having an outer shape larger than the inner diameter of the rivet portion 53 formed at one end thereof so as to be cut, and a spacer portion 47 and a knob portion 55.
A recess 57 for holding the printed board 3 between the spacer portion 47 and the knob portion 55 by a rotation operation of the knob portion 55 is formed between the rivet portion 53 and the mandrel 3.
It is characterized in that it is expanded in diameter by a head portion 33a which is press-fitted at the time of pulling out 3, and the other printed board 1 is held by the spacer portion 47.

[0008]

When the printed board mounting rivet according to claim 1 is applied to a stack structure of printed boards, the mounting is carried out by first inserting the rivet parts into the rivet part insertion holes provided in each of the opposing printed boards. At the same time, the protrusion is inserted into the protrusion insertion hole.

Next, the mandrel temporarily fixed to the rivet part is
When the mandrel is pulled out with a predetermined force using a tool, respectively, the mandrel is separated from the rivet part, and the mandrel head is press-fitted into the rivet part to expand each rivet part and then cut from the mandrel, Each printed board is held by the spacer portion and the expanded rivet portion.

Then, a stack structure of the printed boards is realized by attaching both the printed boards at a plurality of positions by the same method. In order to realize a stack structure of printed boards using the printed board mounting rivet according to claim 2, first, the spacer portion is inserted through the spacer portion insertion hole provided in one of the printed boards, and the tip end of the spacer portion is inserted. The rivet portion is inserted into the rivet portion insertion hole of the other printed board, and the spacer portion is arranged on the printed board.

Then, the entire mounting rivet is rotated in either direction via the knob portion, and the printed board is held by the concave portion between the knob portion and the spacer portion. After this, if the mandrel protruding from the knob part is pulled out with a predetermined force using a tool, the mandrel is separated from the rivet part, and
The head portion of the mandrel is press-fitted into the rivet portion to expand the diameter of the rivet portion, then cut from the mandrel, and the printed board is held between the spacer portion and the expanded rivet portion.

Therefore, a stack structure of printed boards can be realized by mounting the printed boards at a plurality of positions in the same manner.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings. Note that the same components as those in the conventional example shown in FIG. 9 are denoted by the same reference numerals, and description thereof is omitted.

FIG. 1 is a perspective view of an embodiment of a rivet for mounting a printed board according to the first aspect of the present invention, and FIG. 2 is a front view of the rivet in its used state. Hole 1
7 and 19 are block-shaped (rectangular parallelepiped-shaped) spacer portions formed in the longitudinal direction, and the spacer portions 15 are formed of an aluminum alloy. Then, as shown in FIG. 2, on the opposing surface sides of the main printed circuit board 1 and the sub printed circuit board 3 which are arranged to face each other with a certain space therebetween, plate-shaped supporting portions 21 formed in a rectangular shape, 23 is integrally formed, and the spacer portion 15 functions as a spacer for keeping the distance between the two printed boards 1 and 3 as in the case of the conventional distance bolt.

Further, the supporting portions 21 and 23 are hollow cylindrical rivet portions 25 and 2 which communicate with the mandrel through holes 17 and 19, respectively.
7 are respectively displaced and integrally projected one by one, and the rivet parts 25 and 27 are circular rivet part insertion holes 29 provided in the main printed board 1 and the sub printed board 3, respectively.
It can be inserted into 31. And each rivet part 2
The mandrel 33 made of steel penetrates the mandrel through holes 17 and 19 from the 5, 27 side so that the mandrel 33 is attached to the rivet parts 25 and 27.
The mandrel 33 is temporarily fixed to the rivet parts 25 and 27 by pulling with a tool described later.

The rivet parts 25 and 27 are respectively
It is set to be longer than the thickness of the main printed board 1 and the sub printed board 3. The mandrel 33 has rivet parts 25, 27.
A spherical head 33a having an outer diameter larger than the inner diameter of the head 33a is formed at one end, and a notch 35 is provided at the base of the head 33a so that the head 33a can be easily cut when the head is pulled out by a tool. Has been.

Further, in FIG. 1, 37 and 39 are circular convex insertion holes 41, which are provided in the main printed board 1 and the sub printed board 3, respectively.
The hollow cylindrical protrusions that can be inserted into the holes 43 communicate with the mandrel through holes 17 and 19, respectively. As shown in FIG. 2, the mandrel 33 penetrating the mandrel through holes 17 and 19 has its tip protruding from the above-mentioned convex portions 37 and 39, and the mandrel 33 thus protruding is predetermined with a tool. When the mandrel 33 is separated from the rivet portions 25 and 27 by pulling it out in the direction of the arrow by force, the head portions 33a thereof are press-fitted into the rivet portions 25 and 27, respectively, as shown in FIG.
27 is expanded, and the head 33a is formed at the cut 35.
Is cut from the mandrel 33 and only the mandrel 33 is pulled out,
The main printed board 1 and the sub printed board 3 are held by the spacer portion 15 and the expanded rivet portions 25 and 27, respectively.

The printed board mounting rivet 45 according to the present embodiment is constructed in this way, and when a stack structure is applied to the printed boards 1 and 3 using the printed board mounting rivet 45, the mounting is not performed. First, the rivet portions 25 and 27 of the printed board mounting rivet 45 are inserted through the four corners of the sub printed board 3 and the rivet insertion holes 29 and 31 provided in the main printed board 1 so as to face the four corners, respectively. The protrusions 37 and 39 are inserted into the protrusion insertion holes 41 and 43.

Then, the mandrel 33 temporarily fixed to the rivet portions 25 and 27 may be pulled out in the direction of the arrow with a predetermined force using a tool. Thus, when the mandrel 33 is pulled out in this manner, the mandrel 33 is separated from the rivet parts 25 and 27, and the head 33a of the mandrel 33 is separated into the rivet parts 25 and 27, respectively.
After being pressed in and expanding the diameter of each rivet part 25, 27,
After being cut from the mandrel 33, the main printed board 1 and the sub printed board 3 are held by the spacer portion 15 and the expanded rivet portions 25 and 27 as shown in FIG.

By attaching the four corners of the sub-printed board 3 to the main printed-circuit board 1 in the same manner, a stack structure of the main printed-circuit board 1 and the sub-printed board 3 is realized, and the convex insertion holes 41 and 43 are formed. Inserted protrusions 37, 39
Prevents the fixed main printed board 1 and sub printed board 3 from rotating.

As described above, the head 33a of the mandrel 33 is
Is cut from the mandrel 33 at the notch 35 and remains pressed into the rivet portions 25 and 27, but if the amount of protrusion of the rivet portions 25 and 27 from the main printed board 1 and the sub printed board 3 is small. , Head 3 cut as shown in FIG.
3a may come off the rivet parts 25 and 27.

However, even in this case, the rivet portion 2
Since the heads 33a and 5 and 27 are expanded in diameter, the main printed board 1 and the sub-printed board 3 are held by the spacer part 15 and the expanded rivet parts 25 and 27 as shown in FIG. There is no problem because it

As described above, when the stack structure of the main printed board 1 and the sub printed board 3 is applied, by using the printed board mounting rivet 45 according to the present embodiment, the parts can be provided as compared with the conventional example shown in FIG. Since the stack structure can be realized with one type of component having a small number of points, the assembling work becomes easier than the conventional one.

5 to 8 show an embodiment of a rivet for mounting a printed board according to the second aspect. Also in this embodiment, the same parts as those in the conventional example shown in FIG. 9 are designated by the same reference numerals, and their description will be omitted.

First, in FIG. 5, reference numeral 47 is a sub-printed board 3.
Is a block-shaped (rectangular parallelepiped-shaped) spacer portion that can be inserted into the spacer insertion hole 49 provided on the main printed board 1 and the sub-print board, which is formed of the same material as that of the spacer portion 47. It functions as a spacer for keeping the distance between the plates 3.

A hollow cylindrical rivet portion 53 that can be inserted into a circular rivet portion insertion hole 51 provided in the main printed board 1 is integrally formed at the insertion side end of the spacer portion 47. . The rivet portion 53 is also longer than the wall thickness of the main printed board 1.

On the rear end side of the spacer portion 47, a rectangular parallelepiped knob portion 55 having the same vertical and horizontal dimensions as that of the spacer portion 47 is integrally formed, but as shown in FIG. 5, the knob portion 55 is formed. A recess 57 having the same size as the thickness of the auxiliary printed board 3 is formed between the spacer portion 47 and the spacer portion 47. As shown in FIGS. 5 to 7, a columnar guide portion 59 is formed in the concave portion 57, and the circular arc portion 59a thereof protrudes from the front side and the rear side of the spacer portion 47 and the knob portion 55. It has a structure.

Then, as shown in FIG. 5, the spacer insertion hole 49 has three circular holes 49a, 49b, 4a.
Although it is a compound hole consisting of 9c, when the circular arc portion 59a is fitted in the central hole 49b, the knob portion 5 as shown in FIG.
When this is rotated 90 ° in either forward or reverse direction via 5, the sub-printed board 3 engages with the concave portion 57 and the knob portion 5
The sub-printed board 3 is held by the spacer 5 and the spacer 47.

Further, in FIG. 5, reference numeral 61 denotes one mandrel through hole provided in the spacer part 47, the knob part 55 and the guide part 59 so as to communicate with the rivet part 53. The mandrel through hole 61 has a rivet part 53 side. The mandrel 33 penetrates from the rivet part 5
3, the mandrel 33 is temporarily fixed, and the tip of the mandrel 33 projects from the knob portion 55.

Then, as in the above embodiment, when the mandrel 33 is pulled out with a predetermined force in the direction of the arrow shown in FIG. 8 using a tool, the mandrel 33 is separated from the rivet portion 53, and then the head portion 33a of the mandrel 33a is riveted. The rivet portion 53 is press-fitted into the diaper 53 to expand its diameter, and then the head portion 33a is cut from the mandrel 33 at the notch 35, and the main printed board 1 is held by the spacer portion 47 and the expanded rivet portion 53. It is supposed to be done.

Since the printed board mounting rivet 63 according to this embodiment is constructed in this way, when a stack structure is applied to both printed boards 1 and 3, a mounting method using the printed board mounting rivet 63 is adopted. First, the spacer portion 47 is inserted through the spacer portion insertion holes 49 provided at the four corners of the sub printed board 3, and the rivet portion 5 at the tip thereof is inserted.
3 is inserted into the rivet insertion hole 51 on the main printed board 1 side, and the spacer portion 47 is arranged on the main printed board 1.

Then, the arcuate portion 59a is fitted into the central hole 49b of the spacer insertion hole 49, and is moved in either forward or reverse direction through the knob portion 55 as shown in FIG.
When rotated by 0 °, the sub-printed board 3 engages with the recess 57, and the sub-printed board 3 is held by the knob portion 55 and the spacer portion 47.

After this, the mandrel 3 protruding from the knob portion 55
3 may be pulled out in the direction of the arrow with a predetermined force using a tool. When the mandrel 33 is pulled out in this manner, the head 33a of the mandrel 33 is press-fitted into the rivet portion 53 to expand the diameter of the rivet portion 53. Then, the head 33a is cut from the mandrel 33 and only the mandrel 33 is pulled out, and the main printed board 1 is held between the spacer part 47 and the expanded rivet part 53.

By attaching the four corners of the sub printed board 3 to the main printed board 1 by the same method, the stack structure of the main printed board 1 and the sub printed board 3 can be easily realized.

As described above, when the stack structure of the main printed board 1 and the sub printed board 3 is applied, if the printed board mounting rivet 63 according to the present embodiment is used, one direction with one kind of parts having a small number of parts is used. Since the stack structure of the printed boards 1 and 3 can be easily realized by the work from, the assembling work becomes easier as compared with the conventional example shown in FIG.
Moreover, since the number of parts is small, it is possible to reduce the weight of parts.

[0036]

As described above, according to the printed board mounting rivet of claim 1, the number of parts is reduced as compared with the conventional rivet, and the assembling work is facilitated, and the printed board of claim 2 is also provided. In addition to the above effects, the mounting rivet has
Since the stack structure of the printed boards can be easily realized by the work from one direction, the assembling work becomes easier and the weight of the parts can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a rivet for mounting a printed board according to claim 1.

FIG. 2 is a front view of the printed board mounting rivet shown in FIG. 1 in use.

FIG. 3 is an enlarged view of an essential part showing a mounting structure of a printed board by a rivet part and a spacer part.

FIG. 4 is an enlarged view of an essential part showing the mounting structure of the printed board by the rivet part and the spacer part.

FIG. 5 is a perspective view of an embodiment of a rivet for mounting a printed board and a main printed board and a sub printed board according to a second aspect of the present invention.

6 is a side view of the rivet for mounting the printed board shown in FIG.

FIG. 7 is a plan view of a rivet for mounting a printed board.

FIG. 8 is a perspective view of a stack structure of a main printed board and a sub printed board using printed board mounting rivets.

FIG. 9 is an exploded perspective view of a stack structure of a main printed board and a sub printed board using a conventional mounting tool.

[Explanation of symbols]

 1 Main printed board 3 Sub printed board 15,47 Spacer part 17,19,61 Mandrel through hole 21,23 Support part 25,27,53 Rivet part 29,31,51 Rivet part insertion hole 33 Mandrel 33a Head part 35 Notch 37 , 39 Convex part 41, 43 Convex part insertion hole 45, 63 Printed board mounting rivet 49 Spacer part insertion hole 55 Knob part 57 Recessed part

Claims (2)

[Claims] 1. A metal spacer portion, in which two parallel mandrel through holes are formed, maintaining a distance between printed boards which are arranged to face each other with a constant distance, and a printed board facing surface of the spacer portion, A hollow cylindrical rivet part, which is displaced and integrally protrudes one by one, and which is connected to the mandrel through hole and can be inserted into a rivet part insertion hole provided in the printed board, and the spacer part facing the printed board. A hollow cylindrical convex portion that is displaced and integrally protruded, and that is inserted into the convex portion insertion hole provided in communication with the mandrel through hole and provided on the printed board, and the mandrel through holes. It consists of a mandrel that penetrates from the side and is temporarily fixed to the rivet part, and a head having an outer shape larger than the inner diameter of the rivet part is formed at one end so that it can be cut. Expanded with the above head, PC board mounting a rivet, characterized in that has a printed board with a serial spacer portion so that pinching. 2. A metal spacer part which is formed so as to be insertable into a spacer part insertion hole provided in one of the printed boards which are opposed to each other with a constant space, and which keeps the interval between both printed boards, and the spacer part. A hollow cylindrical rivet part that is integrally projected at the tip of the insertion side and can be inserted into a rivet part insertion hole provided on the other printed board, and a knob part that is integrally formed on the rear end side of the spacer part. And a head having an outer shape larger than the inner diameter of the rivet portion at one end by penetrating from the rivet portion through a mandrel through hole provided in the spacer portion and the knob portion in communication with the rivet portion. Is a mandrel formed so that it can be cut, and between the spacer part and the knob part, a recess for holding the printed board between the spacer part and the knob part by a rotating operation of the knob part A rivet for mounting a printed board, wherein the rivet portion is formed such that the diameter of the rivet portion is expanded by the head portion that is press-fitted when the mandrel is pulled out and the other printed board is held by the spacer portion. .