JP4128724B2 - Transmission control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a transmission control device connected between a telephone line and a terminal device such as an electronic watt-hour meter or a gas meter, and in particular, a printed wiring board (hereinafter referred to as a PC board) on which a cable connection terminal is mounted. Is related to the structure of the terminal block for fixing in the storage case of the transmission control device.
[0002]
[Prior art]
Conventionally, a transmission control device connected between a telephone line and a terminal device such as an electronic watt-hour meter or a gas meter has a plug-in terminal for connecting a telephone line and a plug-in terminal for connecting a terminal device at the end. And a PC board on which an electronic circuit for transmission control is mounted. And this PC board is fixed in the plastic case which accommodates the whole transmission control apparatus with a terminal block.
[0003]
FIG. 6 is an exploded perspective view showing the structure of such a conventional transmission control device. FIG. 6A is a view showing a state before the PC board 1 and the terminal block 2 are combined, and FIG. The figure which shows the state which the terminal block 2 combined, (C) is a figure which shows the housing | casing which consists of the case 11 and the cover 14. FIG.
[0004]
As shown in FIG. 2A, the telephone line side plug-in terminal 3 and the terminal device side plug-in terminal 4 are fixed to the upper surface of the rectangular PC board 1 by soldering on both sides of the front end portion, respectively. ing. The lead portions 7 of these plug-in terminals 3 and 4 are fixed so as to protrude from the lower surface of the PC board 1. On the upper surface of the PC board 1, electronic components constituting a transmission control circuit are mounted and connected to each other by a printed wiring (not shown).
[0005]
The terminal block 2 is composed of a rectangular plastic plate having a surface perpendicular to the surface of the PC board 1, and the width of the rectangular board is substantially the same as the width of the PC board 1. The terminal block 2 has a telephone line side terminal hole 5 and a terminal device side terminal hole 6 formed through the vertical surface. A horizontal protrusion having a screw hole 9 is formed at the center of the bottom side of the terminal block 2. The screw hole 9 is provided corresponding to the screw hole 10 formed in the center portion of the front end of the PC board 1.
[0006]
The PC board 1 is combined with the terminal block 2 as shown in FIG. That is, the front edge of the PC board 1 is moved horizontally toward the vertical surface of the terminal block 2, and the telephone line side plug-in terminal 3 and the terminal apparatus side plug-in terminal 4 fixed to the PC board 1 are respectively connected to the terminals. The telephone line side terminal hole 5 and the terminal device side terminal hole 6 formed in the block 2 are passed through, and the telephone line side plug-in terminal 3 and the terminal device side plug-in terminal 4 are opposite to the vertical surface of the terminal block 2. Combined and integrated so as to be located on the side.
[0007]
At this time, the terminal block 2 on the lower side of these holes so that the lead portions 7 of the plug-in terminals 3 and 4 protruding from the back surface of the PC board 1 pass through the terminal holes 5 and 6 of the terminal block 2. Is formed with a slit 8.
[0008]
In the state where the PC board 1 is combined with the terminal block 2 as described above, both are housed in a case 11 having a streamlined roof, and the screw 12 is inserted into the screw hole 9 of the terminal block 2 as shown in FIG. by passing the screw hole 13 of the screw hole 10 and the case 11 of the PC board 1, PC board 1 and the terminal block 2 is fixed to the case 11.
[0009]
Thereafter, the case 11 is covered with the cover 14, and the cover screw 15 provided on the front surface of the cover 14 is screwed into the cover mounting screw hole 16 of the case 11 to complete the transmission control device.
[0010]
[Problems to be solved by the invention]
However, the structure of such a conventional transmission control device has the following drawbacks. First, when assembling the PC board 1 to the terminal block 2, lead terminals 3 and 4 are inserted into the terminal block 2 so that the plug-in terminals 3 and 4 fixed on the PC board 1 can easily pass through the terminal holes 5 and 6, respectively. Although the slit 8 for passing the portion 7 is formed, this is not sufficient, so it is necessary to provide a slight margin for the dimensions of the terminal holes 5 and 6 with respect to the external dimensions of the plug-in terminals 3 and 4. It was. As a result, when a gap is formed between the two and the transmission control device is installed outdoors, insects such as rainwater and ants enter the PC board 1 from this gap, and corrode and deteriorate electronic components and wiring patterns. There was a problem of letting it go.
[0011]
Secondly, when the PC board 1 is combined with the terminal block 2 and stored in the case 11 and screwed, the PC board 1 is not fixed to the terminal block 2 and is held by manpower or jigs. However, there is a drawback that the efficiency of the assembly work is poor.
[0012]
Third, the resin mold for manufacturing the terminal block 2 requires a slide mold in order to form the slit 8 through which the lead portion 7 of the plug-in type terminals 3 and 4 passes. For this reason, there existed a fault that a metal mold | die becomes complicated and a mold cost becomes expensive.
[0013]
Therefore, an object of the present invention is to provide a transmission control device structure that improves these drawbacks, has high airtightness, is easy to assemble, and can be manufactured at low cost.
[0014]
[Means for Solving the Problems]
The terminal block of the transmission control device according to the present invention includes a PC board on which a telephone line side plug-in terminal and a terminal device side plug-in terminal are mounted and a control circuit is formed, and a terminal block coupled to the PC board. In the transmission control device comprising a case for storing these and connected between the telephone line and the terminal device, each of the plug-in terminals has a protrusion formed on the front surface thereof, and the terminal The block includes a frame body in which each of the plug-in terminals is inserted in a vertical direction, and a horizontal plate that integrally supports the frame body and fixes the frame body in the case. When each plug-in terminal is inserted, the back plate in contact with the rear surface of each plug-in terminal is separated by a slit formed on both sides thereof so that it can be bent and has elasticity. When the front projection of each plug-in terminal passes The rear plate is deformed so as to be elastically deformed so that the opening area of the frame body is enlarged, and after the front protrusions pass through the frame bodies, the protrusions have the original opening area. It is configured to be engaged with the upper end of the frame body that has returned to its size.
[0015]
In the terminal block of the transmission control device of the present invention, a partition plate is provided on the horizontal plate of the terminal block at a position between the telephone line side plug-in terminal and the terminal device side plug-in terminal. It is characterized by being.
[0016]
Further, in the terminal block of the transmission control apparatus of the present invention, the horizontal plate of the terminal block and is characterized in that a groove for strip's Ppugeji.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
[0018]
FIG. 1 is an exploded perspective view showing the transmission control device of the present invention, showing how the PC board 1 ′, terminal block 2 ′, case 11 ′ and cover 14 ′ are assembled.
[0019]
In the figure, components that are the same as or correspond to those in FIG. 6 are denoted by the same or dash symbols, detailed description thereof will be omitted, and the following description will focus on portions that are different from FIG.
[0020]
In the figure, on the PC board 1 ', there are four telephone line side plug-in terminals 3' on the left front end, and two terminal device side plug-in terminals 4 'on the right front end. Each of them is fixed together with electronic parts that perform transmission control by soldering or the like.
[0021]
When these plug-in terminals 3 ′ and 4 ′ push the projections 3A and 4A, the conductive wires can be inserted into the wiring holes 3B and 4B formed in the front slope, and the projections 3A and 4A are inserted in the inserted state. When separated, the conductive wire is fixedly connected in the wiring holes 3B and 4B. Further, the front slopes of the plug-in terminal 3 ′ and plug-in terminal 4 ′ protrude forward from the lower vertical surface, and eaves-shaped front protrusions 3C and 4C are formed.
[0022]
On the other hand, in the terminal block 2 ', the vertical plate 2A and the horizontal plate 2B are coupled in an L shape, and the terminal hole 17 for inserting the telephone line side plug-in type terminal 3' is formed at the left end of the horizontal plate 2B. Are respectively formed with terminal holes 18 into which the terminal device side plug-in terminals 4 'are inserted. On the horizontal plate 2B around these terminal holes 17 and 18, as will be described later, frame bodies 19 and 20 for supporting the circumference of the plug-in terminal 3 'and plug-in terminal 4' are provided. Yes. The frame 19 includes a front plate 19A, a back plate 19B, and left and right side plates 19C and 19D that support the periphery of the plug-in terminal 3 ', and an upper portion is open. Further, the front plate 19A is configured to be shorter than the other walls, and the corners are cut out so that the upper portions of the left and right side plates 19C and 19D are continuous with the upper end of the front plate 19A. Furthermore, both sides of the back plate 19B are separated by slits 19E formed between the side plates 19C and 19D, and the back plate 19B can be bent backward with respect to the side plates 19C and 19D on both sides. . The frame 20 includes a front plate 20A, a back plate 20B, left and right side plates 20C and 20D, and a slit 20E, and the structure thereof is the same as that of the frame 19. As will be described later, when the terminal block 2 is coupled to the PC board 1, the upper ends of the front plates 19A and 20A of the frames 19 and 20 are connected to the plug-in terminals 3 'and the plug-in terminals 4'. The front projections 3C and 4C are engaged.
[0023]
As will be described later, screw holes 21 to be attached to the case 11 are provided at both ends of the front portion of the horizontal plate 2B constituting the terminal block 2 ', and a partition plate 22 is provided at the center portion. That is, the partition plate 22 is provided so that its surface is perpendicular to the horizontal plate 2B, its rear side is in contact with the vertical plate 2A of the terminal block 2 ', and the front upper corner is partially cut off. It is inclined.
[0024]
Furthermore, on the horizontal plate 2B on both sides of the partition plate 22, a platform-like portion 23 is provided at a portion behind the front end portion, and grooves 24A and 24B having a predetermined length are formed in this portion. These grooves 24A and 24B are used as strip gauges as described later. This terminal block 2 'is integrally formed by a plastic mold using a mold.
[0025]
As described above, the case 11 ′ has a shape in which the cover 14 is put on the front surface thereof. A screw hole 16 for fixing the cover 14 and a screw hole 25 for fixing the terminal block 2 'are formed in the front end portion of the bottom surface of the case 11'. Of these, the screw holes 25 are opened at both ends of the bottom surface. It has been. Further, a screw 15 for fixing to the case 11 ′ is provided in the center of the front surface of the cover 14.
[0026]
Next, a method for assembling a transmission control apparatus using each component configured as described above will be described. First, the terminal block 2 'is moved downward (in the direction of arrow 30) from the upper side of the PC board 1, and the plug-in type terminal 3' and the plug-in type terminal 4 'on the PC board 1 are respectively connected to the terminals of the terminal block 2'. It press-fits in each frame 19 and 20 through the holes 17 and 18. The plug-in type terminal 3 ′ and the plug-in type terminal 4 ′ move upward in the frame bodies 19 and 20, respectively, and are bent by pushing the rear plates 19B and 20B of the frame bodies 19 and 20 rearward by the front slopes. When the opening area of the body is enlarged and the front projections 3C and 4C reach the upper ends of the front plates 19A and 20A, the back plates 19B and 20B return to the vertical plane due to their elastic force, and the opening area of the frame is also restored. Return to size. In this state, the frames 19 and 20 firmly support the plug-in terminal 3 ′ and the plug-in terminal 4 ′, respectively. As described above, the plug-in type terminal 3 ′ and the plug-in type terminal 4 ′ are pressed into the frame bodies 19, 20 upward from the lower portions thereof, whereby the elasticity of the back plates 19 B and 20 B constituting the frame bodies 19, 20 is obtained. The terminal block 2 can be fixed to the PC board 1 with one touch by a snap action using force. The frame members 19 and 20 are not limited to the rear plates 19B and 20B, and the front plates 19A and 20A or the left and right side plates 19C and 19D or 20C and 20D may be provided with slits to use their elastic force. Is possible.
[0027]
FIG. 2 is a cross-sectional view showing the relationship between the plug-in terminal 4 ′ and the frame body 20 in a state where the terminal block 2 ′ is fixed to the PC board 1 ′. The plug-in terminal 4 ′ is held in the frame 20 , and the eaves-like front protrusion 4 C is engaged with the upper end of the front wall 20 A. Further, the front plate 20 A plug-pin 4 'surrounding the body portion surrounding the rear plate 20 B, the left and right side plates 20 C, 20 D, are securely supported without clearance.
[0028]
In this state, the PC board 1 ′ and the terminal block 2 ′ are connected to the terminal block 2 ′ with respect to the force from the front (arrow 28) and the force from the left oblique direction (arrow 29) applied at the time of wiring connection. The back plates 19B and 20B receive the force, and the terminal block 2 with which the front projections 3C and 4C of the plug-in terminals 3 'and 4' engage with respect to the upward force (arrow 30). It is configured to be received by the upper end portions of the front plates 19A and 20A .
[0029]
Further, with respect to the force (arrows 32 and 34) for pushing the PC board 1 ' in the vertical direction, the front plates 19A and 20A and the rear plates 19B and 20B of the terminal block 2' contacting the plug-in type terminal 4 'are used. The PC board 1 ′ and the terminal block 2 ′ can be securely fixed without any gap between each other.
[0030]
The PC board 1 ′ and terminal block 2 ′ thus integrated are housed in the case 11 ′ from the front as shown in FIG. 1, and the screws 26 are tightened through the screw holes 21 and 25. , Fixed to the bottom of the case 11 '.
[0031]
Finally, the cover 14 is fitted into the front surface of the case 11 ′, and the screw 15 is passed through the screw hole 16 and fixed to the bottom of the case 11 ′.
[0032]
Next, the effect of the partition plate 22 provided in the center part of the terminal block 2 ′ will be described with reference to FIGS.
[0033]
FIG. 3 is a plan view showing a state in which the telephone line and the wiring from the terminal device are connected to the above-described transmission control device. In the figure, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals. In the figure, a telephone line side wire 35 and a terminal device side wire 36 are plugged into a plug-in type terminal 3 'and a plug-in type terminal 4' housed in a case 11 '. After this wiring connection, the plug-in type terminals 3 ′ and 4 ′ where the terminal block 2 ′ and the wiring are connected are covered with the cover 14 (FIG. 1). In this case, the wiring should be able to withstand some tension. It is necessary to have some margin. Therefore, the wiring is stored in the cover 14 once folded. The folded portions 35 ′ and 36 ′ are arranged so as to be in contact with the opposite side of the partition plate 22 surface.
[0034]
As described above, by providing the partition plate 22 in the terminal block 2, the partition plate 22 can be used as a guide for the return length when the wiring is folded back in a narrow space. You can do it.
[0035]
Further, since the partition plate 22 is provided, it is possible to prevent the wiring 35 on the telephone line side and the wiring 36 on the terminal device side from crossing, so that both wirings can be easily performed.
[0036]
Further, the provision of the partition plate 22 in the terminal block 2 can improve the lightning resistance. This improvement in lightning resistance will be further described with reference to FIG. FIG. 4 is a front view of a terminal block 2 ′ for explaining the lightning resistance performance of the transmission control apparatus according to the present invention.
[0037]
In general, the transmission control device is required to have lightning resistance, but the lightning resistance in the transmission control device is determined by the linear distance L between the connection portion of the telephone line and the connection portion of the terminal device. Therefore, in FIG. 4, when the partition plate 22 is not provided, the insulation distance of the transmission control device is the inner terminal closest to the plug-in terminal 4 ′ of the plug-in terminal 3 ′ and the plug-in terminal 4 The minimum distance L from the inner terminal closest to the plug-in type terminal 3 ′ is obtained. However, since the partition plate 22 is provided between the plug-in type terminal 3 ′ and the plug-in type terminal 4 ′ of the terminal block 2 ′, the insulation distance becomes a distance that bypasses the partition plate 22; I is
I = a + b + c and naturally, I> L.
[0038]
Where a is the distance between the tip of the inner terminal 37 of the plug-in terminal 3 ' and the tip of the partition plate 22, b is the thickness of the partition plate 22, and c is the tip of the inner terminal 38 of the plug-in terminal 4 '. This is the distance from the tip of the partition plate 22.
[0039]
Thus, by providing the partition plate 22 between the connection part on the telephone line side and the connection part on the terminal device side in the terminal block 2 ′, the insulation distance I between the two connection parts is determined as the dimension of the partition plate 22. The lightning resistance performance of the transmission control device can be improved.
[0040]
Next, a strip gauge constituted by grooves 24A and 24B having a predetermined length provided in the table-like portion 23 of the terminal block 2 ′ will be described with reference to FIG.
[0041]
5A is a plan view of a terminal block 2 ′ to which a PC board 1 ′ is coupled, FIG. 5B is an enlarged perspective view of a stop gauge portion, and FIG. 5C is a side view of the terminal block 2 ′.
[0042]
In FIGS. 4A and 4B, wiring from the telephone line or wiring 40 from the terminal device is connected to the plug-in terminal 3 ′ of the telephone line side connection portion or the plug-in terminal 4 ′ of the terminal device side connection portion. When inserting, in order to expose the conductor part of the wiring 40, it is necessary to peel off the coating of the wiring. In that case, the optimal length of the conducting wire for connecting with an insertion-type terminal reliably is requested | required. Accordingly, a groove 24A (24B) indicating an optimum conductor length is provided in the terminal block 2 ', and when the coating of the wiring 40 is peeled off, the conductor 40 with the coating is removed from the strip gauge. Is inserted into the groove 24A (24B), and the length within the groove is visually confirmed or marked with a pen or the like, and the coating is peeled off from that portion. Then, as shown in FIG. 3C, the conductor portion 41 from which the coating has been peeled is inserted into the connection hole 42 of the insertion type terminal 3 ′ or 4 ′ and connected.
[0043]
In this way, by providing the groove 24A (24B) indicating the optimum length of the conductive wire for connection in the terminal block 2, a strip gauge can be formed, and variations in the stripping length of the coating can be prevented. More reliable connection can be realized.
[0044]
Although the embodiments of the present invention have been described in detail above, the present invention is not limited to these embodiments, and various modifications can be made within the scope of the idea of the present invention. For example, the frame bodies 19 and 20 of the terminal block 2 ′ are not necessarily cylindrical, and the left and right side plates 19C, 19D, 20C, and 20D may be omitted. The means for applying an elastic force to the frames 19 and 20 is not limited to a means for forming a slit, and the material of the frame may be an elastic body.
[0045]
【The invention's effect】
According to the present invention described above, when the combined integrating the terminal block to the PC board, the terminal block, an elastic support frame for inserting the plug-in terminals mounted on the PC board in the vertical direction, this support frame By engaging a protrusion formed on the front surface of the plug-in terminal with the upper end portion of the plug, it can be integrated with one touch. In addition, with the above configuration, the terminal block can be connected to the plug-in type terminal mounted on the PC board without any gaps, and the airtightness can be improved, thereby preventing the corrosion and deterioration of the wiring pattern. can do.
[0046]
Further, according to the terminal block of the present invention, since it is not necessary to provide a lead portion slit in the terminal block, the mold becomes simple, and the cost for separating the mold is reduced, which is advantageous in terms of cost.
[0047]
Furthermore, according to the present invention, since the terminal block is provided with the shielding wall, not only can the lightning resistance of the transmission control device be improved, but the conductor connection to the plug-in type terminal is facilitated, and the working efficiency is further improved. Can be improved.
[0048]
Furthermore, according to the present invention, since the groove for the stop gauge is provided in the terminal block, the coating of the conducting wire can be accurately peeled off, and the length of the conducting wire portion without variation can be maintained, so that transmission control can be performed. Reliability as a device can be improved.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing a structure of a transmission control apparatus according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a state in which a terminal block according to the present invention is combined with a PC board.
FIG. 3 is a plan view showing a state in which a telephone line and wiring from a terminal device are connected to the transmission control device of the present invention.
FIG. 4 is an explanatory diagram for explaining lightning resistance performance of a transmission control device according to the present invention.
FIG. 5 is a diagram illustrating a strip gauge function of a transmission control device according to the present invention.
FIG. 6 is an exploded perspective view showing a structure of a conventional transmission control device.
[Explanation of symbols]
1, 1 'PC board 2, 2' Terminal block 3, 3 'Telephone line side plug-in type terminal 4, 4' Terminal device side plug-in type terminal 3C, 4C Front projection 11, 11 'Case 14 Covers 17, 18 Insertion terminal holes 19A, 20A Front plate 19B, 20B Rear plate 22 Partition plates 24A, 24B Groove 35 for strip gauge Telephone line side wiring 36 Terminal device side wiring 40 Conductor

Claims (3)

A telephone board-side plug-in terminal and a terminal apparatus-side plug-in type terminal are mounted, and includes a PC board on which a control circuit is formed, a terminal block coupled to the PC board, and a case for housing them. In the transmission control device connected between the line and the terminal device, each of the plug-in terminals has a protrusion formed on the front surface thereof, and the terminal block has the plug-in terminals perpendicular to each other. A frame that is inserted in a direction, and a horizontal plate that integrally supports these frames and fixes them in the case, and each frame is inserted with each plug-in type terminal. When the back plate in contact with the rear surface of each plug-in terminal is separated by a slit formed on both sides of the back plate so as to be bent and has an elastic force, the front projection of each plug-in terminal When the part passes, the back plate is deformed and the opening area of the frame body is It is formed so as to be elastically deformable, and after the front projection passes through each frame, the projection engages with the upper end of the frame whose opening area has been restored to its original size. It is comprised so that it may carry out. The transmission control apparatus characterized by the above-mentioned.   2. The transmission according to claim 1, wherein a partition plate is provided on a horizontal plate of the terminal block at a position between the telephone line side plug-in terminal and the terminal device side plug-in terminal. Control device.  3. The transmission control device according to claim 2, wherein a strip for the strip gauge is provided in the horizontal plate of the terminal block.

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