JP3096204B2 - Lead terminal mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead terminal mounting structure for mounting lead terminals connected to input / output terminals of a noise filter to a terminal block fixed to a printed circuit board by using bolts and nuts. "Mounting structure").

[0002]

2. Description of the Related Art For example, when an input terminal of a noise filter mounted on a printed circuit board of a power supply device is connected to a power supply line, the input terminal of the noise filter and a lead wire connected to the power supply line are connected to each other. It is also conceivable that both are connected to each other via the conductor pattern by soldering to the conductor pattern. However, when a large current of about 40 A flows into the power supply device, the conductor pattern may be burned out, and in general, the lead pattern connected to the input terminal of the noise filter and the power supply line are connected. The mounting structure is such that the lead terminals are connected to each other by tightening them with bolts and nuts on a terminal block fixed to the printed circuit board.

An example of this type of mounting structure is disclosed in Japanese Patent Application Laid-Open No. 5-307981. In this conventional mounting structure, a terminal block provided with a bolt hole is fixed to a printed board by soldering mounting feet formed on the terminal block, and a lead terminal having a bolt hole is mounted on the printed board side from the printed board side. A nut is fastened to a bolt that has passed through both bolt holes, so that the bolt is attached to the terminal block. In this case, a hole larger in diameter than the head of the bolt is provided on the printed circuit board facing the bolt hole of the terminal block, and when the bolt is passed through both bolt holes, the head of the bolt passes through the hole. And directly contact the back surface of the terminal block.

According to this conventional mounting structure, first, a terminal block is fixed on a printed circuit board, and then a bolt is passed through the bolt hole of the terminal block from the printed circuit board side. Next, after attaching the lead terminal to the bolt so that the bolt hole penetrates, for example, while pressing the lead terminal against the terminal block with the abdomen of the finger of the left hand, the nut is fitted into the bolt shaft with the right hand.
After the nut has been fitted, stand the printed circuit board with your right hand, and with your left hand, insert the screwdriver into the cross groove of the bolt,
Next, after supporting the printed circuit board with the left thumb and the box driver, fit the box driver into the nut with the right hand, support the printed circuit board with the box driver and the driver, and tighten the bolts to attach the lead terminals to the terminal block. I have.

[0005]

However, in such a conventional mounting structure, while the printed circuit board is supported by the box driver and the driver, the bolt must be tightened with care so that the driver does not come off the cross groove of the bolt. However, it is complicated and time-consuming, resulting in an increase in cost. Also, since the head of the bolt is stuck in the hole of the printed circuit board, it is difficult to see the head of the bolt, and once the driver comes off the cross groove, the work of re-inserting the driver into the cross groove is further performed. This is a factor of cost increase.

[0006] On the other hand, as a device that can easily attach a lead terminal, a device in which a screw hole is formed in a terminal block and a device in which a nut is welded to the back surface of the terminal block are known. These can be bolted from above the terminal block through the bolt holes of the lead terminals, and can be bolted without using a box driver. However, in order to allow a large current to flow through the lead terminals, bolts having a large diameter of 6 mm must be used. Therefore, when the bolts are tightened, a part of the bolt tightening torque is reduced by the mounting feet of the terminal block. This causes another problem that cracks are generated in the soldered portion and the reliability of the soldering is reduced. In the latter case, there is also a problem that the cost is further increased because the nut is welded.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and aims to reduce the cost of attaching lead terminals to a terminal block and to prevent the soldering reliability of the terminal block mounting feet from deteriorating. It is an object of the present invention to provide a mounting structure that can be used.

[0008]

According to a first aspect of the present invention, a terminal block provided with a bolt hole is soldered to a mounting foot formed on the terminal block to a printed circuit board. By fixing a lead terminal having a bolt hole to a printed circuit board and tightening a nut to a bolt penetrating both bolt holes, at least one of a bolt and a nut in a lead terminal mounting structure mounted on a fixed terminal block Is a square type, and the printed circuit board is a square type bolt (square bolt) or nut (square nut) at the position where the bolt holes of the terminal block face each other.
Is fitted, and has a fitting hole capable of preventing the rotation of the fitted square bolt or square nut. It is characterized in that the fitted square bolt or square nut is prevented from coming off in the terminal block direction.

According to a second aspect of the present invention, in the mounting structure of the first aspect, the fitting hole has a shape complementary to the shape of the head surface of the fitted square bolt or the peripheral surface of the square nut. It is characterized by being formed.

According to a third aspect of the present invention, there is provided the mounting structure according to the second aspect, wherein the fitting holes are formed by overlapping complementary shapes with a slight phase shift in the circumferential direction of the fitting holes. It is characterized by being formed in.

According to a fourth aspect of the present invention, in the mounting structure according to any one of the first to third aspects, the terminal block is provided with a stopper for restricting rotation of the lead terminal. Features.

[0012]

According to the mounting structure of the first aspect, first, when the mounting nut of the terminal block is fixed to the printed circuit board by soldering, the square nut is used when the square nut is used. Fit into the fitting hole of the printed circuit board. Then
The bolt that has been passed through the bolt hole of the lead terminal is passed through the bolt hole of the terminal block. In this state, since the square nut is located at a position facing the bolt hole of the terminal block, the bolt is easily screwed into the square nut. Next, for example, while supporting the printed circuit board with the thumb of the left hand and pressing each mold nut with the belly of the index finger of the left hand, tightening the bolt with a screwdriver held in the right hand, there is no need to press each mold nut thereafter, each mold nut Moves to the terminal block side while being prevented from rotating by the fitting hole, and finally comes into contact with the back surface of the terminal block, thereby completing the bolting. As described above, after the square nut is fitted into the fitting hole, the bolting operation can be easily performed without using a box driver. Further, since each mold nut is fitted into the fitting hole, the stress due to the rotation of each mold nut among the tightening torque is absorbed by the printed circuit board, and as a result, the stress applied to the mounting foot of the terminal block is reduced. When using a square bolt, insert the square bolt into the fitting hole of the printed circuit board, fit the head of the square bolt into the fitting hole, and then pass through the bolt hole of the terminal block. Attach the lead terminals to the square bolts. After that, when the nut is tightened with a box driver, the head of the square bolt is prevented from rotating in the fitting hole, so the lead terminal can be easily attached to the terminal block in the same manner as described above. it can.

According to the second aspect of the present invention, the fitting hole is formed in a shape complementary to the shape of the head of the square bolt or the peripheral surface of the square nut fitted in the fitting hole. Since the head of the fitted square bolt or the peripheral surface of the square nut is in close contact with the fitting hole, the rotation of the square bolt or the square nut can be completely prevented and the bolt can be tightened.

According to the mounting structure of the third aspect, the fitting can be performed by forming the fitting hole into a shape in which the complementary shapes are overlapped with the phase slightly shifted in the circumferential direction of the fitting hole. As a result, it is easy to fit the head of the square bolt or the square nut into the fitting hole.

According to the mounting structure of the fourth aspect, if the terminal block is provided with a stopper for restricting the rotation of the lead terminal, the lead terminal hits the stopper and prevents the rotation when the bolt is tightened. The bolting becomes easier.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A mounting structure according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view showing each component in the mounting structure according to the present embodiment. FIG. 2 is a partial cross-sectional perspective view showing a state where each component in FIG. 1 is attached.

As shown in FIG. 1, in this mounting structure, a terminal block 1 and a printed circuit board 2 for fixing the terminal block 1 are provided.
Lead terminal 4 having bolt holes 3 and lead terminal 4
The bolt 5, the spring washer 6, and the nut 7 for attaching the component are used as constituent elements.

The terminal block 1 has a plurality (two in this embodiment).
In this case, the lead terminals 4, 4 and the terminal block 1 itself are connected to each other. The terminal block 1 is formed by bending a flat iron plate punched into a substantially cross shape. As shown in FIG.
Four side walls 12, 12,... Bent at right angles to the front, rear, left and right (in FIG.
And the entire shape is table-like.

The upper wall 11 is provided with a bolt hole 13 at the center thereof through which the bolt 5 can be penetrated and smaller than the outer diameter of the nut 7, and when the bolt 5 is tightened, the lead terminal 4 is turned. Detents (stoppers) to prevent movement
4, ... are provided at each of the four corners. This detent 1
3, 14... Are formed by cutting a part of the upper wall 11 in a U-shape, and then bending the tongue-shaped part upward of the terminal block 1 as shown in FIG.

The upper wall 11 has a back surface (a back side portion of the terminal block 1) whose nut 7 is fitted in a fitting hole 22 to be described later.
In the direction of the terminal block 1 is prevented.
That is, after the nut 7 is fitted in the fitting hole 22, the upper wall 11 is tightened with the bolt 5, and at least a part of the peripheral surface of the nut 7 is fitted in the fitting hole 22. Depending on the thickness, the lower surface of the nut 7 may be flush with the back surface of the printed circuit board 2, may slightly protrude from the back surface, and may slightly enter the fitting hole 22. Of the nut 7 protruding from the surface of the printed circuit board 2 hits the rear surface of the upper wall 11 to prevent the nut 7 from coming off in the terminal block 1 direction. It has become.
The nut 7 may be bolted via a washer. In this case, the side wall 12 is formed at a height in consideration of the thickness of the washer.

Of the side walls 12, 12,..., The front and rear side walls 1
Two mounting feet 15 for fixing the terminal block 1 to the printed circuit board 2 by soldering are formed on the lower side of both ends of the two.

The printed circuit board 2 is provided with four holes 2 at positions where the four mounting feet 15 of the terminal block 1 can be inserted.
1, 21,... Also, on the back surface side of the printed circuit board 2, around the holes 21, 21.
A conductor pattern is formed (not shown) so that 5, 15,... Can be soldered. Further, when the terminal block 1 is fixed to the printed circuit board 2, a fitting hole 2 is provided at a position directly below the bolt hole 13 of the terminal block 1 (a position facing the bolt hole 13).
2 are formed. The fitting hole 22 is formed in a shape complementary to the peripheral surface shape of the nut 7, that is, in a hexagon substantially similar to the outer shape of the nut 7 so as to prevent the rotation of the nut 7.

In this embodiment, the lead terminal 4 is a crimp terminal, and the lead terminal 4 is described above so that the bolt 5 can pass through the center of the flat terminal surface formed integrally with the crimp sleeve 4a. Bolt holes 3 are formed. Also, the crimp sleeves 4a, 4a of the two lead terminals 4, 4 shown in FIG.
Are connected to, for example, a noise filter (not shown) and a power supply line.

Next, in this mounting structure, the lead terminals 4
A description will be given of the mounting of.

First, the lower surface of the side wall 12 is
Until the four holes 21, 21 of the printed circuit board 2
Insert the mounting feet 15, 15... Of the terminal block 1 into 21. Then, in this state, the mounting feet 15, 15,... Are soldered to the conductor pattern of the printed circuit board 2. In this case, if a soldering iron having a large heat capacity is used, since the mounting feet 15 are formed thin and narrow, the heat applied to the mounting feet 15 is not easily transmitted to the side walls 12, 12,. As a result, soldering can be performed more quickly than when the mounting feet 15 are formed wider, and automatic soldering becomes possible.

Next, after the nut 7 is fitted into the fitting hole 22, the bolt 5, which is inserted through the spring washer 6 and the bolt hole 3 of each of the lead terminals 4, 4, is passed through the bolt hole 13. In this case, since the fitting hole 22 is directly below the bolt hole 13, the bolt can be easily tightened. In addition, at the time of bolting, the nut 7 moves upward (to the terminal block 1 side) along the wall surface of the fitting hole 22, and when the bolting is completed, as shown in FIG. Terminal block 1
The nut 7 comes into contact with the wall surface of the fitting hole 22 while being in contact with the back surface of the upper wall 11.
For this reason, by setting the bolts 5 to have an appropriate length, the space on the back surface side of the printed circuit board can be effectively used without causing the shaft of the bolt 5 to protrude too much on the back surface side of the printed circuit board 2. .

Further, when the bolt is tightened, the peripheral surface of the nut 7 is in close contact with the wall surface of the fitting hole 22.
As a result, the stress applied to the soldered portion of the mounting foot 15 is reduced, so that a decrease in the reliability of soldering can be prevented.

As described above, according to the present embodiment, since the fitting hole 22 is similar to the outer shape of the nut 7, the nut 7
Is in close contact with the wall surface of the fitting hole 22. For this reason, for example, the nut 7 can be fixed only by pressing the nut 7 with the belly of the finger of the left hand, and after that, the finger may be released from the nut 7 and the printed circuit board 2 is only supported by the left hand,
The bolt 5 can be tightened with the screwdriver held in the right hand.
For this reason, compared with the case of tightening the bolt while paying attention so that the driver does not come off from the cross groove of the bolt,
This can be performed easily and quickly, and the cost of bolting can be reduced.

Further, since the peripheral surface of the nut 7 is in close contact with the wall surface of the fitting hole 22, even if the printed circuit board 2 moves or the driver rattles, the bolt is tightened due to this. The applied force does not act as extra stress on the mounting foot 15 of the terminal block 1, and as a result, the reliability of soldering does not decrease.

Further, since the nut 7 abuts on the back surface of the upper wall 11 of the terminal block 1, it is possible to prevent the nut 7 from coming off in the direction of the terminal block 1 and to prevent the printed circuit board 2 from being tightened. The printed circuit board 7 is not deformed or damaged. Note that the prevention of the nut 7 from being removed is not limited to the embodiment. For example, a part of the side wall 12 of the terminal block 1 may be
After being cut out in the shape of a letter, the tongue-shaped portion may be bent inward to prevent the nut 7 from coming off.

Further, since a detent 14 is provided,
At the time of bolt tightening, the rotation of the lead terminal 4 is prevented, so that bolt tightening is facilitated. In addition, the detent 14
Since the outer peripheral side of the upper wall 11 of the tongue-shaped portion is bent, when the lead terminal 4 rotates, it engages with the tongue-shaped portion, and as a result, further rotation can be completely prevented.

In the mounting structure of the embodiment, the fitting hole 22 has a shape approximating the outer shape of the nut 7. However, the present invention is not limited to this. For example, as shown in FIG. 4, a regular hexagon which is an outer shape of the nut 7 and a regular hexagon which is rotated by 30 ° about the center of the regular hexagon as shown in FIG. It may be formed in a combined shape. In this case, the number of positions where the nut 7 can be fitted is 2
As a result, the fitting of the nut 7 can be facilitated, and the cost can be further reduced.

The shape of the bolt hole 3 of the lead terminal 4 is not limited to the shape shown in the embodiment.

Further, in this embodiment, the fitting holes 22
Although the example in which the nut 7 is fitted to the nut has been described, the present invention is not limited to this, and the head of the hexagon bolt is fitted in the fitting hole 22 and the hexagon bolt protruding from the terminal block 1 is attached to the hexagon nut,
You may make it tighten a square nut and a butterfly nut.

In this embodiment, the mounting feet 15,
Although the description has been made of an example in which 15... Are soldered on the back surface side of the printed circuit board 2, the present invention is not limited to this. Further, a conductor pattern may be provided on the front surface side of the printed circuit board 2 at a position where the side walls 12, 12,... Abut, and the side walls 12, 12,. In the above case, the soldering of the mounting feet 15, 15,... Of the terminal block 1 can be reinforced.

[0037]

As described above, according to the mounting structure of the present invention, one of the square bolt and the square nut is fitted into the printed circuit board at the position where the bolt hole of the fixed terminal block faces. And a fitting hole having a shape capable of preventing rotation of the fitted square bolt or square nut, wherein the back side of the terminal block has a square bolt or square nut fitted into the fitting hole. Is prevented from coming off in the direction of the terminal block, thereby facilitating the bolt tightening and reducing the bolt tightening cost. In addition, since the stress applied to the mounting foot of the terminal block is reduced, the reliability of the soldering of the mounting foot can be prevented from lowering.

[Brief description of the drawings]

FIG. 1 is a diagram showing components of a mounting structure according to an embodiment of the present invention.

FIG. 2 is a diagram when the mounting is completed in the mounting structure according to the embodiment of the present invention.

FIG. 3 is an enlarged view of a detent according to the embodiment.

FIG. 4 is a view showing a fitting hole of a printed circuit board according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Terminal block 2 Printed circuit board 3 Bolt hole 4 Lead terminal 5 Bolt 7 Nut 11 Upper wall 12 Side wall 13 Bolt hole 15 Mounting foot 22 Fitting hole

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01R 12/04

Claims (4)

(57) [Claims] 1. A terminal block provided with a bolt hole is fixed to the printed circuit board by soldering a mounting foot formed on the terminal block to the printed circuit board. In a lead terminal mounting structure mounted on the fixed terminal block by tightening a nut to a bolt penetrated through both bolt holes, at least one of the bolt or the nut is square, and the printed circuit board is the terminal At the position where the bolt holes of the table face each other, the above-mentioned square bolt (square bolt)
Or a fitting hole into which a nut (square nut) is fitted and which can prevent rotation of the fitted square bolt or square nut, and when the lead terminal is tightened with the bolt, the terminal The mounting structure for a lead terminal, wherein the back side portion of the base prevents the square bolt or the square nut fitted into the fitting hole from coming off in the terminal block direction. . 2. The fitting according to claim 1, wherein the fitting hole is formed in a shape complementary to the shape of the head of the fitted rectangular bolt or the peripheral surface of the rectangular nut. Mounting structure for lead terminals. 3. The fitting hole according to claim 2, wherein the complementary shape is formed by superimposing the complementary shape with the phase slightly shifted in a circumferential direction of the fitting hole. The lead terminal mounting structure described. 4. The lead terminal mounting structure according to claim 1, wherein the terminal block is provided with a stopper for restricting rotation of the lead terminal.