JPH0139196B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to improvements in coaxial pin plugs used primarily in audio equipment.

[Technical background of the invention and its problems]

Conventionally, RCA type coaxial pin plugs have been widely used in audio equipment. This pin plug had a central contact that was coaxially fixed and protruded more forward than an outer peripheral contact. Therefore, when connecting the pin plug to the socket,
The center contact is connected first, followed by the outer peripheral contact. However, if the center contact on the positive side is connected while the outer peripheral contact on the ground side is not connected, extremely large noise is generated at the time of the connection. Also, when the pin plug is removed from the socket, in the conventional pin plug, the outer circumferential contact on the grounding side comes off first, and then the center contact 1 separates from the socket.
Therefore, even at this time, extremely large noise was generated. Therefore, when connecting and separating the pin plug, it is necessary to use a very small volume, which is troublesome, and if the user forgets to do this, the above-mentioned annoying noise is generated. Furthermore, if an unintentional external tensile force is applied to the cord connected to the pin plug, the pin plug comes off, causing the above-mentioned noise.

Therefore, in the past, as a noise countermeasure, there was a device consisting of three pins, in which one ground pin protruded further than the other two. According to this, when connecting, the ground pin is connected first. At the same time, when the pin plug is separated, the ground pin is later removed. Therefore, no noise was generated when the pin plug connected and separated. However, this three-pin pin plug needs to be connected only from a specific direction by aligning each pin plug with the three pin holes of the mating socket.
It was troublesome.

[Summary of the invention]

Therefore, in view of the above problems, the present invention is a coaxial pin plug, in which the outer peripheral contact 3 is connected first when connecting, and is removed later when disconnecting. The purpose of the present invention is to provide a product that is compatible with the RCA type pin plug, which is already extremely widely used in audio equipment.

The pin plug of the present invention fixes the center contact 1 on the axis of the pin plug body 2. An outer circumferential contact 3 is provided so as to be spaced apart from and coaxial with the center contact 1, and the outer circumferential contact 3 is configured to be movable in the axial direction. Further, a locking block 4 that engages and disengages the outer peripheral contact 3 is provided so that the outer peripheral contact 3 can be moved and locked. An engaging pawl 7 is protruded from the tip of the locking block 4, and this engages the outer peripheral contact 6 of the socket 5.
The pin plug is characterized in that the lock of the outer peripheral contactor 3 of the pin plug itself is released when the pin plug itself is pressed into contact with the pin plug.

Therefore, when the pin plug is pulled out, the outer peripheral contact 3 having a large contact resistance remains behind, and the center contact 1 comes off first. When reconnecting the pin plug after it has been pulled out, the outer contact 3 is first connected to the socket, and then the center contact 1 is connected. Therefore, there is almost no generation of unpleasant noise when the pin plug is connected or disconnected. In addition, since it is a coaxial type, the pin plug can be connected and separated very easily and quickly, resulting in good operability. Furthermore, if a locking ring groove is provided on the outer circumferential surface of the socket 5, it is possible to lock with a single touch operation, and when separating, the pin plug can also be removed with a single touch. moreover,
Due to the structure in which the outer peripheral contactor 3 can move in the axial direction,
Despite having the above-mentioned effects, the length of the pin plug is relatively short and the appearance is good.
At the same time, it becomes a pin plug that is hard to break.

[Embodiments of the invention]

Next, one embodiment of the present invention will be described based on the drawings.

Fig. 1 is a perspective view of the pin plug when it is connected to a socket, Fig. 2 is a longitudinal sectional view thereof, and Fig. 3 is a sectional view taken along the line B-B in Fig. 2, showing the main parts. . 4 is a perspective view of the pin plug in a state removed from the socket, FIG. 5 is a longitudinal sectional view thereof, and FIG. 6 is a sectional view taken along the line A--A in FIG. Furthermore, FIG. 7 is a perspective view of the main parts of the present pin plug, and FIG. 8 is an elevational view of the best example of the socket to which the present pin plug is connected.

The main parts of this pin plug are, as shown in Fig. 7, a stepped round rod-shaped center contact 1;
It has an insulating block 11 and insulating washers 12, 13 which are fixed to the pin plug body 2 (FIG. 2). In addition, it has a sliding conductor 10 that fits on the outer periphery of the insulating block 11 and an outer peripheral contact 3 that fits on the outer periphery of the sliding conductor 10. Furthermore, it has a locking block 4 that engages and disengages the outer circumferential contact 3, thereby locking the outer circumferential contact 3 and making it movable. Next, this outer circumferential contactor 3 is made of a metal material such as brass, and is formed into a stepped cylindrical shape, and has a notch 16 at its tip, and the tip is configured to be elastically expandable and contractible in the radial direction. There is. At the same time, an inner flange 17 (Fig. 7, Fig. 3) is provided at the middle part and the rear end part.
is formed. The inner flange 17 forms a stopper surface when the insulating washer 12 moves back and forth. Next, as shown in FIGS. 4 and 2, the locking block 4 has three steps formed on the back side. At the same time, a triangular engagement claw 7 is provided at the tip thereof to protrude toward the ventral side of the block. A release protrusion 9 is provided at the rear end of the lock block 4 so as to protrude toward the back side thereof. Further, a stepped portion is formed on the ventral side of the intermediate portion, and is engaged with an insulating washer 12 as shown in FIG. 2 to prevent the insulating block 11 from moving in the axial direction.

Next, the assembly order of this pin plug will be explained.

First, the insulating washer 12 is inserted into the outer peripheral contact 3 as shown in FIG. At this time, the insulating washer 12 is inserted with its plane facing the axial direction of the outer circumferential contact 3, and then its direction is changed and the outer circumferential contact 3 is inserted.
The peripheral edge of the washer 12 is brought into contact with the inner flange 17 at the intermediate portion of the washer 12. Next, a cylindrical sliding contact conductor 10 made of a metal material is inserted and fitted into the outer peripheral contactor 3.
Next, the center contact 1 is inserted on their axes, and the insulating block 11 and the insulating washer 1 are inserted.
3 from the rear. Then, the rear part of the center contact 1 from the stepped part is passed through the through hole of the insulating block 11 or the like. Next, a nut 19 is screwed onto the threaded portion 18 formed at the rear end of the center contact 1, as shown in FIG. At the same time, the leaf spring 14 and locking block 4 are fitted as shown in FIG. The leaf spring 14 always urges the rear part of the locking block 4 upward in FIG. Furthermore, the pin plug main body 2 is detachably screwed onto the threaded portion 18 at the rear end of the sliding conductor 10 as shown in FIG.

Also, the socket connected to this pin plug is the 8th one.
Preferably, it is formed as shown in the figure. This socket has a shape similar to that of a socket to which a conventional RCA type pin plug is connected, with a locking ring groove 8 formed on the outer periphery. In other respects, it is completely the same as the conventional one. This locking ring groove 8 is into which the engaging pawl 7 of the locking block 4 is fitted. As a result, the connection is maintained even if an unexpected external force is applied to the cord connected to the pin plug. However, this pin plug is not only fitted into a socket as shown in Fig. 8, but is also widely used in the past.
It may also be fitted into an RCA type pin plug socket. In this case, it does not have a locking function when fitted.

Furthermore, this pin plug is of course not limited to the above-mentioned embodiments; for example, in this embodiment, the outer circumferential contact 3 is constructed of an integral type made of a metal material, but the present invention is not limited to this; may be constructed of plastic material. Furthermore, although the sliding conductor 10 is formed into a cylindrical shape in this embodiment, only a part of the cylindrical body may be used. Furthermore, in a pin plug to be fitted into a socket as shown in FIG. 8, a ring-shaped convex portion 20 as shown in FIG. 9 is formed on the inner surface of the tip of the outer peripheral contact 3, thereby making the connection more reliable. good. In addition, if the socket
In the case of the conventional RCA type, the ring-shaped protrusion 20 is not necessary. The leaf spring 14 is formed into an appropriate shape, and when the releasing convex part 9 is pressed, the first step part 22 and the second step part 23 of the locking block 4 move downward in FIG. , the engaging claw 7 is configured to move upward. As long as it is constructed in this manner, the mutual relationship between the locking block 4, the leaf spring 14, and the fulcrum portion 24 of the sliding contact conductor 10, which serves as the fulcrum of the locking block 4, can be appropriately determined.

[Action of the invention]

Next, the operation of the present invention will be explained. First, it is assumed that the pin plug is connected to the socket 5 as shown in FIG. 8 in the state shown in FIGS. 1 to 3. In this state, the engaging pawl 7 is locked in the locking ring groove 8 of the socket 5. Therefore, even if the cord connected to the pin plug is pulled carelessly, the pin plug will not come off. Next, to remove this pin plug from the socket 5, first press the release protrusion 9 of the locking block 4.
Then, the locking block 4 rotates clockwise in FIG. 2 using the front intermediate portion as a fulcrum, and the locking pawl 7 disengages from the locking ring groove 8 of the socket 5. At the same time, the first step 22 of the locking block 4
moves downward, so that the outer peripheral contactor 3 locked to the first step portion 22 can move relatively to the left in FIG. 2. Therefore, the release protrusion 9
If you pull out the pin plug body 2 while holding down,
First, the center contact 1 is removed from the socket. The outer peripheral contact 3 is then left behind on the outer peripheral surface of the socket. This is because the outer peripheral contact 3 has a large surface area and is configured so that its contact resistance is greater than that of the center contact 1. When the center contact 1, locking block 4, and pin plug main body 2 move rearward, the rear surface of the insulating washer 12 connects to the inner flange 1 at the rear end of the outer peripheral contact 3, as shown in FIG.
7. Then, the state becomes as shown in FIG. At this time, only the center contact 1 has already come off from the socket 5, and the outer peripheral contact 3 is connected to the socket 5. Next, by subsequently pulling out the pin plug body 2, the outer peripheral contact 3 is also removed from the socket 5. In this way, the removed main pin plug is maintained in the state shown in FIGS. 4 to 6. That is, the tip of the center contactor 1 is located within the outer peripheral contactor 3. Next, in order to reconnect the pin plug in the states shown in FIGS. 4 to 6 to the socket shown in FIG. 8, the pin plug main body may be inserted into the socket 5 without pressing the release protrusion. Then, first, the outer contact 3 of the pin plug is connected to the outer contact 6 of the socket 5. At this time, the center contact 21 of the socket is located to the left in FIG. 8 from the end surface of the outer peripheral contact.
Therefore, the center contacts 1 of the socket and plug are connected later as will be described later. Then, when the pin plug body 2 is further pushed into the socket 5, the locking pawl 7 comes into contact with the tip edge of the socket 5, as shown in FIG. 5, and the pawl 7 is lifted upward. Then, the second step portion 23 of the locking block 4 is pushed down, and the outer peripheral contact 3 becomes relatively movable to the right. Thereby, the center contact 1
moves to the left in FIG. 5 with respect to the outer peripheral contactor 3. The center contact 1 is then connected to the socket 5. Further, when the pin plug main body 2 is inserted, the tip of the insulating washer 12 comes into contact with the inner flange 17 as shown in FIG. 3, and the outer peripheral contact 3 moves to the left together with the center contact 1. Then, in FIG. 2, the engaging claw 7 is fitted into the locking ring groove 8 of FIG. 8, and the connection is completed.

Therefore, in the pin plug of the present invention, the outer peripheral contact 3 is connected first. Then, when removing the plug, the outer peripheral contactor 3 will come off later. Therefore, no noise is generated when the pin plug connects and disconnects. This is because the ground side of the pin plug is always grounded and the center contact 1 connects and disconnects, so the potential of the center contact 1 is always maintained stably, and therefore no noise is generated when connecting and disconnecting. It is something.

〔Effect of the invention〕

The pin plug of the present invention fixes the center contact 1 on the axis of the pin plug body 2. The outer peripheral contact 3 is movable in the axial direction, and the center contact 1 is movable in the axial direction.
spaced apart from the outside and coaxially provided therewith. Further, a locking block 4 is detachably attached to the outer contact 3, so that the outer contact 3 can be moved and locked. Further, an engaging pawl 7 is provided protrudingly at the tip of the locking block 4, and when the engaging pawl 7 is pressed against the outer peripheral contact 6 of the socket 5,
The above-mentioned cancellation is made.

The pin plug of the present invention has the above configuration and has the following effects.

(1) The outer contact 3 of this pin plug is movable in the axial direction. At the same time, lock block 4
has. The outer contactor 3 is configured to be movable when the engagement claw 7 protruding from the tip thereof is pressed against the socket 5. Therefore, when connecting this pin plug to a socket, the outer peripheral contact 3 on the ground side contacts the center contact 1 first. Also, when removing the pin plug, after the center contact 1,
The outer periphery contactor 3 will be separated. Therefore, there is an effect that no unpleasant noise is generated when the pin plug is connected and disconnected. That is, this pin plug has a structure in which the outer contact 3 is connected first and disconnected later due to the interaction between the presence of the locking block 4 and the frictional resistance when the outer contact 3 presses against the socket. Because of this, no unpleasant noise is generated when the plug is separated.

(2) Also, since the outer contact 3 of this pin plug is movable in the axial direction, the overall length of the pin plug itself can be made relatively short, despite the structure in which the ground side is connected first and removed later. Can be done. Therefore, a pin plug with good appearance is provided, and the pin plug is resistant to breakage due to external forces.

(3) Also, since this pin plug has the above configuration, it has been widely used in various conventional audio equipment.
Compatible with RCA type pin plugs. and,
It can be fitted into a socket for the RCA type pin plug. Therefore, it can also be used as a connector for audio equipment that is already in use. At the same time, unlike three-pin plugs, there is no need for directionality during insertion, making insertion and removal easy.

(4) Next, in the embodiment described in claim 2, a locking ring groove 8 is provided on the outer peripheral surface of the outer peripheral contact 6 of the socket 5, and the engaging claw 7 of the coaxial pin plug is provided for this locking ring groove 8. When fitted into the ring groove 8, the outer peripheral contact 3 of the pin plug is locked. Therefore, in this embodiment, the socket 5 and the pin plug are engaged with each other due to the above-mentioned fitting of the engaging claw 7, and there is no possibility of inadvertent separation. Therefore, even if a tensile external force is applied to the cord or the like, the two will not separate.

(5) Next, in the embodiment described in claim 3, in claim 2, a release protrusion 9 is provided at the rear end of the lock block 4, and the lock is released by pressing the release protrusion 9. It is something. Therefore,
According to this embodiment, the pin plug and the socket can be unlocked with one action (so-called one touch) and can be quickly separated.

[Brief explanation of drawings]

Figure 1 is a perspective view of this pin plug showing its state when combined with a socket, Figure 2 is its longitudinal sectional view,
Figure 3 is a cross-sectional view of the main part taken along line B-B in Figure 2, Figure 4 is a perspective view of the pin plug when it is removed from the socket, Figure 5 is its longitudinal cross-sectional view, and Figure 6 is a main part of the sectional view taken along the line A-A in Figure 5;
Figure 7 is a perspective view of the main parts of this pin plug, Figure 8
The figure is an elevational view of the best example of a socket to which the present pin plug is connected, and FIG. 9 is a longitudinal cross-sectional view of the tip end showing another embodiment of the outer peripheral contact 3 of the present pin plug. 1...Center contact, 2...Pin plug body, 3
...Outer contact, 4...Lock block, 5...Socket, 6...Outer contact, 7...Engaging claw, 8...
...Ring groove for locking, 9...Protrusion for releasing, 10...
...Sliding conductor, 11...Insulation block, 12, 13
... Insulating washer, 14 ... Leaf spring, 16 ...
Notch, 17...Inner flange, 18...Threaded portion, 19...Nut, 20...Ring-shaped protrusion, 2
1... Center contact, 22... First step part, 23...
Second step part, 24... fulcrum part.

Claims (1)

[Scope of Claims] 1. A pin plug body 2 with a center contact 1 fixed on the axis, and an outer peripheral contact movable in the axial direction and spaced apart from and coaxial with the center contact 1. a locking block 4 which engages and disengages from the outer contact 3 to lock and release the movement of the outer contact 3; A coaxial pin plug comprising an engaging pawl 7 protruding from the tip of the locking block 4 for release. 2 When the engaging pawl 7 is fitted into the locking ring groove 8 formed in the axially intermediate portion of the outer circumferential surface of the outer circumferential contact 6 of the socket 5, the outer circumferential contact 3 of the pin plug
A coaxial pin plug according to claim 1, wherein the coaxial pin plug is locked. 3. The coaxial pin plug according to claim 2, wherein a release protrusion 9 is provided at the rear end of the lock block 4, and the lock is released by pressing the release protrusion 9.