JPH035113Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a public listening device in which a removable circuit unit is terminal-connected to the center conductor of a coaxial plug attached to a public listening device housing and protruding inside. Regarding terminal connection structure.

(Prior art) Conventionally, in the case of public listening equipment such as line amplifiers used in CATV systems, a circuit unit mounting an amplifier circuit etc. is detachably installed in a device housing made of aluminum die-casting or the like. There is.

Figure 8 shows an example of a conventional device, in which a coaxial plug 2 is screwed and fixed to the side wall of a box-shaped housing 1, and an amplifier circuit, etc. is mounted inside this housing 1. A circuit unit 5 in which a printed circuit board 3 is housed in a case 4 is detachably provided.

In order to electrically connect the printed circuit board 3 and the center conductor 6 of the coaxial plug 2 when the circuit unit 5 is stored, a case 4 is provided, through which the center conductor 6 of the coaxial plug 2 passes when the circuit unit 5 is stored. and cutouts 7 and 8 are provided at the positions of the printed circuit board 3, respectively,
In addition, a terminal connection portion with a pair of spring plates 9 facing each other is provided on the upper part of the printed circuit board 3 where the center conductor 6 of the coaxial plug 2 is located when the circuit unit 5 is housed as shown at 5'.

According to such a terminal connection structure in which a pair of spring plates 9 are soldered and fixed to the printed circuit board 3 in a pressed state, when the circuit unit 5 is lowered into the housing 1 as shown in the figure, the coaxial plug 2 The center conductor 6 passes through the notches 7 and 8 of the case 4 and the printed circuit board 3 and fits between the pair of spring plates 9, and as shown in FIG. Spring plate 9
The terminal connection status is obtained by

By the way, in the CATV system, providing a power supply for each device is complicated and increases costs, so a power supply is installed for multiple devices as a group, and AC is connected to multiple communal listening devices via coaxial cables. I am trying to supply power.

When transmitting power from a power supply device to multiple communal listening devices in this way, the power supply capacity is kept below 90VA, which is within the legally defined range of small power circuits, for example below 30V and 3A. Therefore, even with a simple terminal connection structure using a pair of spring plates as shown in FIGS. 8 and 9, there is no particular problem as long as the terminal connection is up to about 90 VA.

(Problem that the invention attempts to solve) However, in recent years, it has become possible to use up to 900VA as a special case for small power circuits, and for example, in CATV systems, 60V,
It has become possible to use a power supply capacity of up to 15A, but with the conventional terminal connection structure, as the power supply capacity increases, the contact capacity becomes insufficient and electrical corrosion during use increases. However, there was a problem that the conventional terminal connection structure could not solve the problem.

(Means for Solving the Problems) The present invention was made in view of the problems of the prior art, and the circuit unit is removable.
Moreover, it is an object of the present invention to provide a terminal connection structure for public listening equipment that has a large contact capacity in response to an increase in power supply capacity and can sufficiently withstand electrical corrosion.

In order to achieve this object, the present invention has a removable circuit unit 5 in the housing 1, and a central conductor 6 protruding into the housing of the coaxial plug 2 attached to the housing 1. In the terminal connection structure of public listening equipment in which terminal connection is made with the circuit unit 5 housed in the housing, a notch in the printed circuit board 3 where the center conductor 6 of the coaxial plug 2 is located when the circuit unit 5 is housed. A gate-shaped connecting frame 10 is fixed to the upper side of the portion 8 by soldering or the like, and a connecting screw 15 is rotatably inserted into a through hole 12 formed at a position closer to the side than the center of the upper frame 10a of the connecting frame 10. When the screw is inserted into the connecting screw 15 located inside the connecting frame 10, the screw is rotated in the tightening direction to a position substantially perpendicular to the center conductor 6 of the coaxial plug 2 and moved upward. The coaxial plug 2 is rotated in the loosening direction.
A connection plate 16 that rotates and moves downward is provided in a position substantially parallel to the center conductor 6 of the connecting plate 16.

(Function) In the terminal connection structure of the public listening device of the present invention having such a configuration, the connection screw 1 of the connection frame 10
5 is loosened, the connection plate 16 is removed from the storage position of the center conductor 6 of the coaxial plug 2 and rotated to a position where it is approximately parallel to the center conductor 6, so that the connection plate 16 is not obstructed by the connection plate 16. , a connection screw 15 in a gate-shaped connection frame 10 in which a circuit unit 5 is housed in a housing 1 and a center conductor 6 of a coaxial connector 2 is fixed to a printed circuit board 3.
It can be located on the upper part of the connecting plate 16 which is screwed into the connecting plate 16.

When the connecting screw 15 is tightened with the circuit unit 5 housed in the housing 1, the connecting plate 16 is rotated to a position substantially perpendicular to the center conductor 6 of the coaxial plug 2 due to the rotation of the screw and engaged. When the connection screw 15 is further tightened in this state, the connection plate 16 is pulled upward by the rotation of the screw, and finally the center conductor 6 of the coaxial plug 2 is connected to the gate-shaped connection frame 10 on the inside. It can be tightened and fixed between it and the plate 16.

(Embodiment) FIG. 1 is an explanatory diagram showing an embodiment of the present invention in a disconnected state, FIG. 2 is a plan view thereof, and FIG. 3 is a sectional view thereof.

In Fig. 1, numeral 3 is a printed circuit board, which is installed inside the case of the circuit unit housed in the housing of the public listening equipment, and has a coaxial plug that protrudes inside when the circuit unit is housed in the housing. A notch 8 is formed at a position through which the center conductor passes. Printed circuit board 3
A gate-shaped connecting frame 10 is attached to the upper part of the notch 8 formed in the
is fixed to the printed circuit board 3 by soldering.

This gate-shaped connection frame 10 has a through hole 12 formed at a position offset to the left from the center of the upper frame 10a, and an L-shaped support piece 13 is spotted at a lower position opposite to the through hole 12. It is fixed by welding or the like, and a through hole 14 is also formed in the support piece 13 at a position opposite to the through hole 12. Connection frame 10
The threaded portion 15 of the connecting screw 15 is inserted into the through hole 12 formed in the frame upper part 10a and the through hole 14 of the support piece 13.
A is rotatably inserted, and a pair of connection plates 16 are screwed together with a rubber packing 18 sandwiched between threaded portions 15a located between the frame upper portion 10a and the support piece 13.

Since the connecting screw 15 uses a right-handed thread, when the connecting screw 15 is turned counterclockwise (leftward) in the plan view of FIG.
On the other hand, when the connecting screw 15 is rotated clockwise (to the right), the pair of connecting plates 16 with the rubber gasket 18 sandwiched therebetween can be pulled upward. can.

Furthermore, a gate-shaped connection frame 1 is fixed to the printed circuit board 3.
The portion of the printed circuit board 3 facing the opening 8 at 0 forms an upwardly bent bent portion 19, and as will be explained later, this bent portion 19 is connected to the center conductor of the coaxial plug. This is the pressed position.

On the other hand, as is clear from FIGS. 2 and 3, the pair of connection plates 16 screwed into the threaded portions 15a of the connection screws 15 have stopper portions 20 protruding from their tips, and the connection screws 15 are rotated clockwise (rightward). As is clear from FIG. 3, when the connecting frame 10 is rotated, it fits into the receiving groove 21 formed on the side surface of the right arm part 10R of the connecting frame 10 and is in a state substantially parallel to the frame upper part 10a of the connecting frame 10. It is set to be locked. Further, the rubber gasket 18 sandwiched between the pair of connection plates 16 generates friction between the threaded portion 15a of the connection screw 15 and the connection plate 16, and when the connection screw 15 is rotated, the pair of connection plates 16 are caused by the friction caused by the rubber gasket 18 when the connection screw 15 is rotated. It is designed to be able to rotate integrally within a range that does not hit the connection frame 10.

Further, as is clear from FIG. 3, the rubber seal 18 protrudes from the periphery of the pair of connection plates 16 and is pressed against the left arm portion 10L of the connection frame 10, and the pressing of the rubber seal 18 against the arm portion 10L causes the first As shown in Figure 1, connect the connecting screw 15 to the through hole 12 of the upper frame 10a and the through hole 1 of the support piece 13.
4 so that it does not wobble in the vertical direction when inserted.

FIGS. 4A and 4B are cross-sectional views showing one embodiment of the communal listening device equipped with the terminal connection structure of the present invention shown in FIGS. 1 to 3.

In Figures 4A and 4B, 1 is a housing made of aluminum die-casting or the like, and a coaxial plug 2 screwed and fixed to the side surface of the housing 1 is exposed inside and its center conductor 6 protrudes. . Reference numeral 5 designates a circuit unit, which houses a printed circuit board 3 having two sets of the terminal connection structure of the present invention shown in FIGS. A driver 2 equipped with an insulating bush 25 at a position opposite to a connecting screw 15 in a terminal connection structure.
A rotation hole 24 for inserting the 3 is formed. Further, a notch 7 for passing the center conductor 6 of the coaxial connector 2 is formed in the case 4 at a position opposite to the notch 8 of the printed circuit board 3.

Next, the operation of the above embodiment will be explained.

First, as shown in FIGS. 4A and 4B, when the circuit unit 5 is housed in the housing 1, the panel 22
Insert the driver 23 into the connection screw 15 of the terminal connection part through the rotation hole 24 and loosen the connection screw 15.

That is, as shown in FIGS. 1 to 3, the driver 23
When the connecting screw 15 is turned counterclockwise (leftward), the pair of connecting plates 16 also rotate counterclockwise (leftward) due to the friction caused by the rubber gasket 18, as shown in FIGS. 2 and 3. The rotation stops when it hits the left arm part 10L of the connection frame 10,
As a result, the connection plate 16 connects the center conductor 6 of the coaxial plug 2.
When the connecting screw 15 is further turned to the left, the connecting plate 16 is lowered and the upper part of the frame 10a
This will increase the distance between them.

In this way, turn the connection screw 15 and connect the connection plate 1.
6 is lowered and the circuit unit 5 is housed in the housing 1 as shown at 5' as shown in Fig. 4A, the center conductor 6 of the coaxial plug 2 is inserted into the connection frame as shown in Fig. 4B. A bent portion 19 formed in the upper part 10a of the frame.
It will be located below.

In this state, when the connecting screw 15 is rotated clockwise (rightward) by the driver 23, the pair of connecting plates 1 are
6 rotates clockwise (rightward) together with the connecting screw 15, and the pair of connecting plates 16 come to a position substantially orthogonal to the center conductor 6 of the coaxial plug, as shown in FIGS. 5A, 5B, and 6. In this way, the connection plate 16 connects the center conductor 6
When rotated to a position approximately perpendicular to
As is clear from FIG. 7 showing the cross section, the stopper portion 20 formed at the tip of the connecting plate 16 is connected to the receiving groove 21 of the right arm portion 10R of the connecting frame 10.
It fits into and locks in place.

When the connection screw 15 is further turned clockwise (rightward) while the rotation of the connection plate 16 is regulated in this way, the rubber gasket 18 screwed into the threaded portion 15a will be rotated with the rotation of the connection screw 15. A pair of connection plates 16 sandwiched between the two are pulled upward, and the upper part of the frame 10
The center conductor 6 of the connection plug located at the bent part 19 of a is crimped and fixed from below, and the terminal connecting the center conductor 6 of the coaxial plug to the printed circuit board 3 of the circuit unit 5 is thereby secured. A fixed connection state can be obtained.

In this terminal connection structure, the frame upper part 10a of the connection frame 10 and the center conductor 6 of the connection plate 16 are sandwiched and tightened, which makes the connection easier than when the center conductor is pushed between a pair of conventional spring plates. Even if the power capacity supplied to public listening equipment increases through coaxial cables, contact capacity commensurate with the power capacity can be secured,
In addition, since it is mechanically fixed with sufficient strength, it is possible to reliably prevent the electrically contacting portions from being corroded.

On the other hand, when removing the circuit unit 5 housed in the housing 1 for inspection and repair, etc., use the driver 2.
3, the tightened state can be released by turning the connection screw 15 counterclockwise (leftward) and lowering the connection plate 16, and at the same time, the connection plate 16 is rotated to the released position approximately parallel to the center conductor 6. Then, simply by loosening the connecting screw 15 with the driver 23, the connection state of the coaxial plug 2 to the center conductor 6 can be released and the circuit unit 5 can be removed.

In the above embodiment, the rubber gasket 18 is sandwiched between the pair of connecting plates 16 as a means for generating friction to rotate the connecting screw 15 and the connecting plate 16 together, but the present invention The present invention is not limited to this, and for example, friction may be generated between the threaded portion 15a of the connection screw 15 and the threaded hole of the connection plate 16 by appropriately selecting the tolerance between them.

In addition, in the above embodiment, the connection screw 15
A support piece 1 is placed on the underside of the connection frame 10 to stabilize the connection frame 10.
3 is provided, however, the connecting screw 15 may be stabilized by using a longer connecting screw 15 without providing the supporting piece 13 and providing a through hole in the printed circuit board 3.

Furthermore, in the above embodiment, the rubber gasket 18 prevents the screw 15 from rattling.
As another embodiment, a spring may be incorporated between the frame upper part 10a and the connection plate 16.

(Effects of the invention) As explained above, according to the invention, a gate-shaped connection frame is placed above the notch of the printed circuit board where the center conductor of the coaxial plug is located when the circuit unit is housed in the housing. Fix the connection frame, and insert the connection screw rotatably into the through hole formed at a position closer to the side of the top of the frame of the connection frame, and insert the screw rotation in the tightening direction into the threaded part of the connection screw located inside the connection frame. It rotates to a position approximately perpendicular to the center conductor of the coaxial plug and moves upward, and when rotated in the direction of loosening the screw, it rotates to a position approximately parallel to the center conductor of the coaxial plug and moves downward. Since the connection plate is screwed together, the terminal connection structure is such that the center conductor of the coaxial connector is sandwiched and fixed between the connection frame and the connection plate with the connection screws screwed together, so even if the power capacity increases, there will be sufficient contact. Capacity can be secured, a mechanically strong terminal connection state can be obtained, and electrical corrosion will not occur.

In addition, when attaching and detaching the terminal structure to the center conductor of a coaxial plug, when the connecting screw is rotated in the tightening direction, the connecting plate automatically rotates to a position perpendicular to the center conductor and tightens, while loosening the connecting screw. When rotated in the direction, the connecting plate rotates to a disengaged position approximately parallel to the center conductor 6 of the coaxial plug, allowing the coaxial plug to be removed from the center conductor, and the connecting screw is tightened or tightened with a screwdriver. Since all you need to do is attach and detach the terminals, it is extremely easy to do.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an embodiment of the present invention with the terminal removed, Fig. 2 is a plan view of Fig. 1, and Fig. 3 is a plan view of Fig. 1.
The figure is a sectional view of FIG.
5A and 5B are explanatory diagrams showing the embodiment of FIG. 1 in a terminal connected state, FIG. 6 is a plan view of FIG. 5A,
FIG. 7 is a cross-sectional view taken from FIG. 5A, and FIGS. 8 and 9 are explanatory diagrams showing conventional examples. 1... Housing, 2... Coaxial connector, 3... Printed circuit board, 4... Case, 5... Circuit unit, 6...
... Center conductor, 7, 8 ... Notch, 10 ... Connection frame, 10a ... Frame top, 10L, 10R ... Arm part, 12, 14 ... Through hole, 13 ... Support piece,
15... Connection screw, 16... Connection plate, 18... Rubber seal, 19... Bent part, 20... Stopper part, 21... Receiving groove, 22... Panel, 223...
...driver, 24...rotation hole, 25...insulation bushing.

Claims (1)

[Scope of Claim for Utility Model Registration] A coaxial connector having a removable circuit unit in a housing, and a terminal with the circuit unit housed in the housing on a center conductor protruding into the housing of a coaxial plug attached to the housing. In the terminal connection structure of the public listening equipment to be connected, a gate-shaped connection frame is fixed to the upper side of the notch of the printed circuit board where the center conductor of the coaxial plug is located when the circuit unit is stored, and the upper part of the connection frame is fixed. A connecting screw is rotatably inserted into a through hole formed at a position closer to the side than the center of the connecting frame, and the center of the coaxial connecting plug is inserted into the part of the connecting screw located inside the connecting frame by rotating the screw in the tightening direction. A connection plate is screwed together that rotates to a position substantially perpendicular to the conductor and moves upward, and rotates in the direction of loosening the screw to a position substantially parallel to the center conductor of the coaxial plug and moves downward. A terminal connection structure for communal listening equipment featuring: