DE9003258U1 - Connection device for data transmission lines, in particular for a data network - Google Patents

Abstract

A data bus connection (11) for data processing installations has a screened, coaxial connector, preferably one having two internal conductors (25, 50), in the case of which a contact is operated when the plug is connected, which contact short-circuits the two inner conductors (25, 50) to one another when the connection is decoupled. In the case of the embodiment, a resistor can also be connected between the internal conductors (25, 50) and the screen (15). In this way, when an apparatus is uncoupled, the data cable is either provided with a terminating resistor or is looped through. <IMAGE>

Description

PATENT ATTORNEYS^"' RUPfüND'eEI E R STU TT GART

Dipl.-Chem.Dr, Ruff Dipl.-Ing. J. B e i e r Dipl.-Phys. Schöndorf

Neckarstrasse SO D-7OOO Stuttgart 1 Tel.: CO7113 227O51» Telex O7-23412 erub d Fax (49) O711 -29 29

20 March 1990 JB/al

Applicant &eegr;: Our sign

PVT precision connection technology
and taxation

Stones^nronn

A25 749

Description

Connection device for data transmission lines, in particular for a data network

The invention relates to a connection device for data transmission lines, in particular for a data network, with at least one plug device with plug contacts, in which a socket and a plug interact.

1 ■ ■ I Ii

A 25 749 - 2 -

In data transmission lines, which include both networks of data processing systems and other transmission lines for high-frequency signals, such as video signals, etc., high-frequency signals are usually transmitted, the accuracy of which is subject to high demands, because even minor interference can have serious consequences. The lines are usually shielded coaxial cables. In data networks, the connection resistance ratios are often very critical, and a branch from a continuous line is usually not possible without special measures. A data network usually has to be looped through from one system to another, i.e. a line has to run to one device and from there to the next device.

A connection device has become known from DE-U-89 08 236, in which a standard telephone socket is used as a through-connection junction box. It contains contacts in the box that normally lie against one another and are simultaneously separated from one another and connected to the corresponding contacts of the plug when the plug is inserted. From there, a double, appropriately shielded cable runs to a coaxial connector in the form of a BNC plug, which can be connected to a corresponding BNC socket on the connected device. The junction box itself is also connected to the data bus via BNC plug connections.

&Lgr; 25 /49 - 3 -

This connection device ensures that the data bus, which is separated when a cable is plugged in for a connected device and is routed through the device, is closed again and routed when the plug is pulled out. The connection contacts, which are designed as flat plug connections, are, however, suitable for data lines
not sufficiently reliably contacted and there is no complete shielding. This is particularly
critical because such connection boxes are usually installed on cable ducts that also carry power cables, so that the susceptibility to STC signals is particularly high
is.

The invention aims to provide a connection device for
To create data transmission lines1 that are based on
a different solution principle works very reliably and without interference and, despite its small size, can be optimally adapted to the network and the connecting devices.

To solve this problem, it is proposed that one of the plug contacts is arranged to be axially movable when the plug device is plugged together and is provided with a switching contact that is activated by axial movement. This makes it possible to separate the data bus, which runs along a wall, for example, when a connector is plugged in, and when this connector is removed, the line closes again and
can thus supply the other devices. This is in
a coaxial connector, preferably with

A 25 749 - 4 -

locking in the axial direction by means of a screw or bayonet lock, which is ideally, i.e. completely, shielded.

According to a further feature of the invention, a terminating resistor can be provided in the plug device which is automatically switched on when the plug connection is disconnected. This can be switched in the same way by an axially displaceable central sleeve without taking up any additional space.

According to a further feature of the invention, the forward and return lines can be connected within a shield in that the connector, which is designed in the manner of a BNC coaxial connector with an inner contact and an insulated shielding outer contact, has an intermediate contact surrounding the inner contact and separated from it by insulation. A coaxial connector with three pins in total does not require any significant additional manufacturing effort and enables connections to be made to data networks in particular, but can also be used for other purposes, for example for stereo connections, separate video and audio connections or other connections with two shielded conductors.

A particularly preferred embodiment connects such a 2-inner conductor connector with two standard connectors, for example SNC connectors, in a T-shape to form a connection unit in which the data bus is connected on both sides via standard BNC connections.

A 25 749 - 5 -

and the connecting cables can be connected with automatic through-connection. Several of these T-pieces can be connected directly to one another by plugging them in and combined to form complete plug strips.

The features described above, although applicable individually, are particularly advantageous in combination with one another.

These and other features of preferred developments of the invention emerge not only from the claims but also from the description and the drawings, whereby these features can also be implemented individually or in combination in the form of sub-combinations in the embodiment of the invention and in other areas and can represent advantageous and protectable embodiments for which protection is claimed here. Embodiments of the invention are shown in the drawings and are explained in more detail below. The drawings show:

Fig. 1 is a longitudinal section through a socket of a plug-in device,

Fig. 2 the socket according to Fig. 1 with connected plug,

A 25 749 - 6 -

Fig. 3 a P-shaped unit consisting of a socket with two internal contacts and supply and discharge plug connections,

Fig. 4 a connection belonging to the socket

5C &eegr;&igr; üo5 t cCkcf VOr dcT Kupp &igr; üTiy,

Fig. 5 a front view of a junction box with two sockets,

Fig. 6 a side view of the junction box,

Fig. 7 is an enlarged partial section through the junction box according to Fig. 5 and 6 and

Fig. 8 a connection cable with two plugs. Fig. 1 and 2 each show a built-in socket.

4- &lgr; D ■ · .*. U «- *% IO &ogr;« -&idiagr; *« s* »* C4- »*»!*.. *«.»»■■:.·. Ux-..m_ 11 &Lgr;&mdash; -14 &mdash;&Ggr;» .. &mdash; I

<-C UU<_ Il O C IC CIIICI OtCl-ISVUI I 11.11,UMy I I. ml UIC D UU Il 5 C a plug 13 (Fig. 2) can be connected. The plug device is designed in the manner of a BNC plug connection and has an inner contact sleeve 14 on the socket 12, which is spaced from a sleeve forming an outer shielding contact 15, which has two lateral projecting pins 16 for a bayonet lock 17, to which an angularly curved slot 18 on a locking sleeve 19 of the plug 13 belongs. This sleeve is rotatably mounted on the housing 22 of the plug with the interposition of an annular disk 20 and a spring ring 21.

A 25 749 - 7 -

The inner contact sleeve 14 is slotted so that it can be expanded and works together with an inner contact 23 of the plug designed like an axial central pin. The inner contact sleeve 14 is located at the end of a central pin 25 _S which is mounted axially displaceably in an insulating insert 24 of the socket, onto which a ring 26 is pressed on the side of the insulating insert 24 opposite the inner contact sleeve 14 at a distance from the end 27 of the central pin 25. A compression spring 28 is guided on the end 27 and is supported between a support shoulder 29 formed by one of the ring surfaces and a ring 30. The upper end of the spring 28 in the drawing is guided by a central pin 31 of a solder connection pin 32 which penetrates the ring 30. The rings 26, 30 and the compression spring 28 are located in a space 33 of an insulating body 34, designed in the manner of a blind bore, which is fastened to a metallic outer body 36 of the socket by means of an overlapping fastening sleeve 35. The outer body 36 is to be fastened to a part of a device, for example a data processing device, to a junction box or the like, via rings 37, 37 and a union nut 38 screwed onto an external thread of the outer body 36.

The insulating insert 24 has a lateral, axially directed recess 39 in which an electrical resistor 40 is accommodated in the manner of a subminiature resistor. It is fixed between the outer body 35, the sleeve-shaped shielding external contact 15 and the insulating body 34 in such a way that it connects the shielding external contact with the

■ ■ &igr;&igr;

&bull; * Il

A 25 749 - 8 -

an end face electrically contacted, while the
other contactable front surface 41 ram part -.ur fixing is overlapped by the insulating body 35, while
on the other end face part, the lower ring surface forming a support shoulder 42 in the drawing
of the ring 26. It forms
ulso a Schaic contact 10.

The BNC connector 13 contains its inner contact 23, designed as a central pin, in the recess of an insulating body 43, on the outside of which runs a shielding outer contact sleeve 44, which is longitudinally slotted,
so that individual contact flags or tongues are formed, § which have external thickenings 45 f. on the upper, free side. &iacgr;

The inner conductor of a UbIi-

coaxial cable, the shield forming the outer conductor S is connected to a crimp sleeve 46 of the connector '4

■&ngr; 13 is connected. %

If the socket is provided, for example, on an oil processing device for its connection to a power supply network or on a corresponding connection socket, the switching contact 10 in the uncoupled state % (Mg. 1) provides an electrical connection via the resistor 40 between the inner contact 25 and the metallic
Housing of the socket, and thus also the mass of the device housing and the shielding. This saves % the special attachment of a with the corresponding
Connection resistor or a short-circuit device

A 25 749 - 9 -

seen termination plug when a connection cable is removed. This is particularly necessary for devices with several connection sockets in order not to disrupt data processing.

However, if a connecting cable (not shown in Fig. 2) is connected by means of the plug 13, then the connected inner contact ^hysteresis 14 with the in-

23 of the plug, and the shielding external contact sleeve 45 contacts the inner surface of a corresponding shielding external contact sleeve 15 of the socket 11. Since the external contact sleeve 14 protrudes further into the cavity 47 within the shielding external contact sleeve 15 than corresponds to the coupled state (Fig. 2), the inner contact sleeve 14 is displaced together with the central pin 25 in the axial direction against the force of the spring 28 during coupling, so that the support shoulder 42 of the ring 26 lifts off the end face 41 of the resistor 40 and thus the electrical contact between the inner conductor 14, 25, 31 and the outer housing 15, 35, 36 is electrically interrupted. The compression spring 28 also establishes the electrical line connection between the central pin 25 and the connecting pin 51.

This automatically switches a terminating resistor on and off. The resistor and its switching device are housed in a housing the size of a normal BNC socket. The axial stroke of the central pin 25 can be significantly smaller than shown. By locking it using the bayonet,

· i

· ii,

A 25 749 - 10 -

which is locked by turning the rotating sleeve 19, this axial position is also fixed. Here, a corresponding screw connection using a union nut or the like could also be provided.

In the following figures, identical or corresponding parts are given the same reference numerals and their description is omitted below.

Fig. 3 shows a plug device 11a which is similar in its basic structure to that shown in Figs. 1 and 2, so that its features and the alternatives explained apply in the same way, but with the following differences: The inner contact sleeve 14 is surrounded by an insulating tube 48, which in turn is surrounded by a sleeve-shaped or tubular intermediate contact 50. It projects beyond the insulating body 24, through which this unit penetrates, so that it surrounds the inner sleeve up to close to its connection-side end. The intermediate contact sleeve 50 has a flange 52 at its end remote from the connection, which lies in a corresponding recess in the insulating body 24 and is connected via a line 53 to the inner conductor pin 54 of a conventional BNC plug, which here, however, is designed without a locking bayonet sleeve. With a dNC socket 56 opposite it with an inner conductor sleeve 57, which is connected to the inner conductor connection 51a of the socket IZa, the BNC plug devices 54, 56 and the socket ¹ Za form an overall T-shaped unit 70. The two BNC connectors 55, 56 are in this case inserted into a transverse bore of a tubular,

A25 740 -11-

The metal housing part 35a is closed at the free end. This results in a very compact unit, the possible applications of which are described in more detail in Figures 5 to 7.

The axially movable central pin 24, which has at its end the slotted inner contact sleeve 14, which is compressed to a somewhat tapered shape when not connected, rests with the contact shoulder 42 of its ring 26 on the flange 52 in the uncoupled state (Fig. 3) and thus electrically connects the inner connections 54, 57 of the BNC connectors 55, 56 to one another. When fitting a plug 13a according to Fig. 4, the inner conductor pin 23, the inner contact sleeve 14 and the central pin 25 are axially displaced against the force of the spring 28, and the switching contact 10 is opened via the contact shoulder 42, so that the inner conductor 14, 23 is now only connected to the inner sleeve 57 of the socket 56, while the intermediate contact 50 is connected to the inner conductor pin 54 of the plug 55.

The plug 13a shown in Fig. 4 is designed in the same way as that described in Fig. 2, but additionally has a slotted and thus resilient inner contact sleeve 60, which is arranged inside the insulating body 43, which is tubular here, and is insulated from the inside of the inner contact 23 on the one hand by an air space and on the other hand by an insulating insert 61. When plugged together, this intermediate contact sleeve 60 interacts with the intermediate contact 50, so that a plug connection is produced in which

A25 749 - 12 -

the three contact levels are coaxial with each other. Sufficient contact pressure is possible by i slitting and inward spreading of the intermediate contact sleeve 60. Inner conductor 23 and intermediate contact 26 are connected to separate t connection lugs 62, 63, which in the present case are located in the interior of a connection piece 65 running transversely to the plugging direction (axis 64), into which a coaxial cable is inserted through a connection opening 66. This forms a very space-saving and stable angle plug.

Fig. 5 and 6 show a wall junction box provided with two connection units 70 according to Fig. 3. It can be seen that the two T-shaped units 70 are each directly plugged together with an 8NC plug 55 and 56, so that they have the basic shape of the Greek letter Pi. Two sockets 12a protrude next to each other from a front plate 71 of the wall box 72. The outer body 36 holds an insulating connecting bridge or plate 73 between its flange-like collar provided with key surfaces and a ring nut 38 screwed onto its external thread, which secures the plugged-together units 70 so that the two sockets 12a run parallel to each other. The connecting plate 73 also serves to hold an edge fastening part 74, which can be inserted into a conventional wall junction box.

&Lgr; 25 749 - 13 -

It can be seen that the T-shaped design of the unit 70 allows any number of connection sockets 12a to be arranged next to one another, whereby these can be arranged parallel to one another, but also at any angle. For example, a connection strip could have connection sockets on several sides by arranging the sockets 12a offset from the adjacent socket at an angle of, for example, 90 or 180°. In any case, it is retained that a continuous data transmission line (data bus) can be connected to the two external connections 55, 56 and it runs completely shielded inside the entire unit, whereby an automatic through-connection, i.e. bridging of the respective connection 12a takes place if it is not occupied by a corresponding connection plug 13a (Fig. 8). By locking using the bayonet lock 17, the very compact and stable connections are also protected against accidental loosening, which is particularly important for data transmission.

A connection cable 75 leads from the respective connection socket 12a to the connected device, which consists of a plug 13a as shown in Fig. 4, a shielded connection cable 76 with two inner conductors 77, 78 and a normal BNC plug 13 as shown in Fig. 2. The two inner conductors are connected separately to the connection lugs 62, 63 of the plug 13a, but are connected together in the BNC plug 13 to its middle connection pin 23. It has been shown that

A 25 749 - 14 -

that this separate routing up to just before the processing device is important for the purpose of adaptation. The shield 79 of the connecting cable is attached to the connector housing by a crimp or compression sleeve 80.

It should also be noted that the new plug connections 12a, 13a with coaxial intermediate contacts 50, 60 are partially compatible with normal BNC plugs. For example, a BNC plug 13 can also be connected to a socket 12a, whereby the intermediate contact 50 then remains unused. It is also possible to design the socket 12a without the internal switching contact 10 if this is not necessary in the specific application. A design with a terminating resistor according to Fig. 1 and 2 could also be used in the connection box or the connection cables, although this is not necessary for the through-connection connection box 72 per se.

Claims (19)

PATENT ATTORNEYS RUFF &ugr;&ohacgr; ^: .&THgr;&eacgr; ^: &Igr;&Egr;&bgr; ^: ' STUTTGART Dipl.-Chem. Dr. Ruft Dipl.-Ing. J.Beier Dipl. Phys. Schöndorf Neckarstrasse 5O D-7OOO Stuttgart 1 Tel.: CO7113 227&Ogr;51* Telex &Ogr;7-23412 erub d Fax (-49) &Ogr;711 -29 29 35 20 March 1990 JB/al Applicant ID: Our sign: PVT Precision Connection Technology and Control Engineering GmbH Meisenweg 17 7031 Steinenbronn
A25 749 Expectations Connection device for data transmission lines, in particular for a data network Connection device for data transmission lines, In particular for a data network, with at least one plug device (11) with plug contacts, in which a socket (12, 12a) and a plug (13, 13a) interact, characterized in that one of the plug contacts (14, 25) when plugging the 25 749 Plug-in device (1 &igr; · ■ ■ · ·
. ■ ■ II·
· 4 t · · at- organized and with egg - 2 - gten A Switch contact (1 0) 1) in the it he axially movable nem hei Axial movement fc^täti Mistake is. 2. Connection device according to the preamble of claim 1, characterized in that ¹ the plug device (11) designed in the manner of a BNC coaxial plug connection with an inner contact (14, 25) and a shielding outer contact (15, 44) insulated from the inner contact (14, 25) and separated therefrom by an insulation (48, 61). 3. Connection device according to the preamble of claim 1, characterized in that a terminating resistor (40) is provided in the plug device (11) which is automatically switched on when it is disconnected. 4. Connection device according to claim 2, characterized in that the intermediate contact (50, 60) is formed by at least one cylindrical intermediate contact sleeve. 5. Connection device according to claim 1 and 3, characterized in that the switching contact (10) which can be automatically activated when the plug connection is coupled, in the uncoupled state, connects two conductor strands of the plug connection, preferably the inner conductor (14, 25) and the shield (15), via the contact in the plug connection. till you A 25 749 - 3 - connection (11) provided resistance (40) and when uncoupling this connection is released*. 6. Connection device according to one of the preceding claims, characterized in that a locking device, preferably in the form of a 3" screw or bayonet lock (17), is provided between the plug (13, 13a) and the socket (12, 12a). 7. Connection device naci; Jine _; ; of claims 2 to 6, characterized in that a sleeve provided on the socket (12) and forming the intermediate contact (50) surrounds an insulating tube (48) in which a preferably slotted plug socket (14) for receiving a plug pin (23) is arranged. 8. Connection device according to one of claims 2 to 7, characterized in that a preferably slotted sleeve provided on the plug, forming the intermediate contact (60), is arranged inside an insulating tube (43), the outside of which is surrounded by the shielding external contact (44). 9. Connection device according to one of the preceding claims, characterized in that the switching contact (10) is provided in the socket (12a) and is closed when the plug (13, 13a) is removed and is open when the plug is coupled. »I 1 · t Ill 1 I > 1 1 »It» » I A 25 749 - 4 - 10. Connection device according to one of the preceding claims, characterized in that the switching contact (10) can be actuated by axial movement of the plug socket (13). 11. Connection device according to one of the preceding claims, characterized in that for the switching contact (IU) there is a contact shoulder (42) provided on the plug contact, preferably in the form of an annular surface of a flange-like ring (26) placed on an inner contact (14, 25), which is pressed against a face contact surface (52) under the action of a spring (28) loading the inner contact (14, 25) axially against the direction of insertion. 12. Connection device according to claim 11, characterized in that the spring (28) is supported on a support shoulder (29) preferably designed as a groove surface of a ring (26) placed on an inner contact (25). 13. Connection device according to claim 11 or 12, characterized in that the spring (28) forms the electrical connection between the inner contact (14, 25) and an inner connection conductor (30, 51) of the plug device (11), wherein it is preferably guided by a section (27) of the inner conductor (25) projecting over the support shoulder (27) and a centering mandrel (31) of the inner connection conductor (51). A 25 749 - 5 - 14. Connection device according to claims 1 and 3 and possibly further claims, characterized in that the switching contact, preferably a contact shoulder (42), interacts with one side of the resistor (40), preferably with an end face (41) of a subminiature resistor, which in particular is fixed with another section of its end face by an insulating body (34) which delimits a space (33) in which the switching contact (10) is arranged and advantageously the resistor rests with its other end face on an annular end face of the shielding external contact (15). 15. Connection device according to one of the preceding claims, characterized in that a socket (12) of a plug device (11) with a terminating resistor (40) is installed in a data processing device and/or a connection box (72) of a data network. 16. Connection device according to one of the preceding claims, characterized in that the socket (12a) is provided with inputs and outputs for data lines designed as coaxial connections, preferably as BNC sockets and/or plugs (55, 56), wherein the sockets and/or plugs (55, 56) are preferably aligned with one another and form a T-shaped unit (70) with the socket (12a), the crossbar of which they represent. A 25 749 - 6 - 17. Connection device according to one of the preceding claims, characterized in that the inlet and outlet sockets (55, 56) are inserted into openings in the casing of a tubular housing part (35a) of the socket (12a). 18. Connection device according to claim 16 or 17, characterized in that several units (70) can be coupled directly with their mutually assigned input and output sockets (55, 56) and, optionally connected to one another via a retaining bridge (73), can be installed in a connection box (72). 19. Connection device according to one of the preceding claims, characterized in that the inner and intermediate contact (23, 60) of the plug (13a) are each connected to an inner conductor of a shielded coaxial line (76) with two inner conductors (77, 78), preferably a coaxial cable, wherein at the other end of the line (76) the two inner conductors (77, 78) are connected to the same inner contact (23) of a plug device (13), preferably a BNC plug.