DE8716011U1 - Plug connection for coaxial cables, especially for antennas - Google Patents

Description

• · · · I t

«4 9 · ·

«•»«ha* «4 ' ·

/ Plug connection for coaxial cables, especially for antennas

'.The invention relates to a plug connection for "..-" coaxial conductors, in particular for antennas according to the preamble of the main claim.

..Axial plug connectors are generally known for connecting car radios to the coaxial conductor of the car antenna. Recently, manufacturers have started to use flatter angle plug connectors. ^These new plug connectors use a socket connected to the car radio which consists of a cylindrical insulating piece with an outer metal shell and ^a sleeve-like central inner conductor. The metal shell is provided with a bead. The corresponding plug according to the state of the art has a central pin which is inserted into the sleeve-like inner conductor of the socket. Three spring arms are used.

(«· · · < < «I I I MiI

It till «· t I Il ·

4Jl ItI II If t

I * I 4 . t « !tilt

* * ·«* Ht III

&diams; H4 ·· 441 lit··»« Il I

over the bead of the outer metal shell of the ,socket and thus form the mass

■ connection, whereby the spring arms which grip the bead also serve ^to mechanically fix the plug.

However, it has been shown that this well-known plug connection does not meet the requirements sufficiently. The vibrations in the car cause the spring arms of the plug to shift on the metal casing of the socket, so that the electrical connection can become faulty. The same applies to the mechanical strength. Furthermore, the plug connection is not sufficiently shielded against interference. Furthermore, car radio manufacturers are moving towards designing car radios in such a way that

■ that they can be easily removed from their holders or inserted again, so that the driver has the option of taking the car radio with them when leaving the car. This means that the number of connections is greatly increased, although with a plug connection according to the state of the art, the mechanical strength and electrical contact cannot be guaranteed after many connections.

The invention is therefore based on the task of creating a plug connection for coaxial conductors, in particular for antennas, in an angled shape, which ensures a secure electrical connection and good mechanical strength even in the case of frequent plugging and strong vibrations, while also being sufficiently

b £ -» Cf ¹ E*
<* fir »&iacgr;£&idigr;&idigr;&Ggr;

«iS 4C S 4 4» «4 With

&bull; aaaai) · aa > aaaa tt i ·■ a ä a **.*■ «« ··. ··· .«·· «. ·

i

10

15

20

25

30

35

should be protected against harmful jets of dust.

This object is achieved according to the invention in a plug connection according to the preamble of the main claim by its characterizing features. Because the plug has a guide sleeve which is designed as an overlapping, springy sleeve which is provided with an inward-facing groove around its circumference near the open end and which is covered with a shielding sheet at the end opposite the open end, the socket is held elastically and reliably in operation even when the insertion is not straight during the plugging process and in the case of multiple plugging. Due to the overlapping design and the shielding sheet, the plug is largely sealed against high-frequency or other harmful interference.

The measures specified in the subclaims enable advantageous further developments and improvements. It is particularly advantageous that an additional spring is provided in the axial direction, which is pre-tensioned in the axial direction. This ensures that a secure ground contact is maintained even in the event of vibrations and, in addition, the mechanical holding force in the axial direction is improved, since an elastic pre-tension is provided.

A further advantageous embodiment consists in that the plug is supported by a plurality of spring legs with locking elements.

IH · · ft

I ■ BI *

&bull; fr · ·

IO

15

20

25

30

35

clamp, whereby one type of spring legs locks into the plug and the other type of spring legs can be locked into the chassis of the car radio. In this way, a floating suspension of the plug is provided, which ensures that the connection is reliable even with manufacturing tolerances and multiple plugs.

An advantageous design of the socket is that the outer metal shell slightly overlaps the inner insulating piece at the end facing the socket, i.e. protrudes slightly beyond the front surface of the insulating piece, since in this way an additional electrical contact with the axial spring is established.

An embodiment of the invention is shown in the drawing and is explained in more detail in the following description. They show:

Fig. 1 is a plan view of an embodiment of the plug connection according to the invention,

Fig. 2 a section through the plug connection according to Fig. 1,

Fig. 3 is a plan view of an embodiment of a clamp securing the plug,

Fig. 4 a section of the bracket according to Fig. 3/ and

Fig. 5 is a schematic view of the

connector attached to the chassis
with indicated socket.

The plug 1 of the plug connection consists of a guide cylinder 2, a shielding plate 3 covering the guide cylinder 2 at the lower end, an axial disc-shaped spring 4, a central pin 6 provided with a connection lug 5, which is fixed between two insulating pieces 7, 8 made of plastic.

The guide cylinder 2 is designed as a metal sleeve, the ends of which are not connected to one another overlap in a resilient manner according to the overlap area 9 according to Fig. 1. Tabs 10 are formed on the lower end of the guide cylinder 2, which are bent over and fix the shielding plate 3. In the immediate vicinity of the open end of the cylinder 2, its circumference is provided with an inward-facing groove 11. Of course, this groove 11 can also be designed as a bead formed on the inner circumference of the cylinder 2.

The axial spring 4 is designed as a disk, the circumference of which is cut in three places in the embodiment, so that three tabs 12 are formed, which are bent upwards under tension. In the circumference of the casing of the guide cylinder 2, cuts are arranged at the height of the axial spring 4, whereby bending ^lugs 13 are formed, which are bent inwards and fix the spring 4.

14 4444 I ii ti ti Il I «II 14 Ii ItI IM

The shielding plate 3 and the spring 4 have lateral guide rails 14, 15, which are guided outwards perpendicularly to the guide cylinder 2 through a recess in the guide cylinder 2. Crimping lugs 16 are arranged on the side of the guide rail 14 of the shielding plate 3. The coaxial conductor (not shown) is pushed between the guide rails 14, 15 in the stripped state and the crimping lugs are bent up vertically so that they form the lateral boundary. The insulating pieces 7, 8 also each have a lateral lug 17, 18 arranged between the guide rails 14, 15. Between the lugs 17, 18 of the insulating pieces 7, 8 there is a cavity in which the connection tab of the pin 6 ends. The stripped inner conductor of the coaxial conductor is pushed into the cavity in such a way that it forms an electrical connection with the inner conductor 5. The cavity is open at the side so that the connection lug 5 is accessible from the outside. This makes it possible for the connection lug 5 to be soldered to the inner conductor of the coaxial cable if desired.

If necessary, the crimp attachments 16 can also be soldered to the lateral guide rail 15 and the ground conductor of the coaxial cable.

3Ö For fastening the plug to the chassis of the car radio, a clamp 19 as shown in Fig. 3 is provided, which is designed like a spider, i.e. has a plurality of springs 21, 22, which are formed on a central part 20. The

3g Spring legs 21 are inclined inwards, while the

tu mm* · · ■** ·

25

30

35

Spring legs 22 have an outward-directed preload. Both types of spring legs 21, 22 are provided with bent locking lugs 23, 24 at their ends.

The fastening of the plug 1 by means of the clamp 19 to a chassis 25 of the car radio is shown in Fig. 5. The plug 1 is arranged between the inwardly bent spring legs 21 of the clamp 19 in such a way that the locking lugs 23 reach over the edge of the guide cylinder 2. Recesses are arranged in the chassis 25 and the outwardly pre-tensioned spring legs 22 are pressed together and the locking lugs 24 are inserted into the recesses so that after the spring legs 22 are released they grip the chassis 25 under tension.

In the drawing according to Fig. 5, the socket of the plug connection is also shown schematically, which is firmly connected to the radio itself. The socket 26 has an outer metal casing which is provided with a bead 27. After the socket 26 has been inserted into the plug 1, the groove 11 engages behind the bead 27. The length of the bead 27 is slightly greater than the distance between the groove 11 and the bent-up tabs 12 of the axial spring 4 in the rest position, so that when the socket is inserted, an axial force is exerted on the socket 26 by the spring 4. In this way, a secure electrical connection between the socket 26 and the plug 2 and a secure mechanical fixation is ensured. Since the manufacturability of the

I ( I
tII

ml ·· <·■ to···· «ä ·

10

15

20

25

30

35

il

Since the guide cylinder 2 is designed to overlap under ¹ voltage, it is easy to insert the socket 26 into the plug, whereby after insertion the bent-apart

, cuff contracts again and creates a safe electrical connection between cuff" and metal casing of the socket* Additionally

__-the box 26 is so auaaecfcairtefc. that ie.

Metal casing slightly projects beyond the end face of the inner insulating piece facing the plug, as indicated in Fig., so that an electrical connection is also provided between the metal casing and the axial spring 4.

* · CtIf ft

■ ■ t m

Claims (9)

"Expectations 1. Plug connection for coaxial conductors, in particular for antennas, with a socket which has an outer metal shell with a bead surrounding an insulating piece with an inner conductor and with a plug which springs over the bead and forms the earth connection with the metal shell, with IQ centrally arranged pin, characterized in that the plug (1) has a guide cylinder (2) which is designed as an overlapping resilient sleeve, the guide cylinder (2) being covered at one end by a shielding plate (3) and being provided with an inwardly directed groove (11) over its circumference near the open end. 2. Plug connection according to claim 1, characterized characterized in that a spring (4) is inserted into the guide cylinder (2) and is pre-tensioned in the axial direction, 3. Plug connection according to claim 1 and 2, characterized in that the axial length of the bead (27) of the bushing (26) is greater than the axial length between the groove (11) of the guide cylinder (2) and the spring (4) in its rest position. 4. Plug connection according to claim 2 or 3,_ characterized in that the spring (4) 3g is designed as a disc, from whose circumference > I Iff» Spring tabs (12) are cut out and bent in the axial direction. 5. Plug connection according to claim 1, characterized in that projections (10) are arranged on the sleeve, which engage under the shielding plate (3) in the bent state and fix it in a form-fitting manner. 6. Plug connection according to claim 1 and a of claims 2 to 4, characterized in that between the spring (4) and the shielding plate (3) two insulating pieces (7, 8) are provided, between which the pin (6) with the connecting lug (5) are fixed. 7. Plug connection according to one of claims 2 to 6, characterized in that the spring (4) is fixed in its axial height to the open end of the guide cylinder (2) by bent-over bending lugs (13) provided on the sleeve. 8. Plug connection according to one of claims 1 to 7, characterized in that the shielding plate (3) and the spring (4) have laterally formed guide rails for receiving the coaxial conductor. 9. Plug connection according to one of claims 1 to 8, _{characterized} in that the plug (1) is surrounded by a clamp (19) which has a plurality of spring legs (21, 22) with locking elements (23, 24), whereby a part of the spring legs (21i) with the locking elements ii i &igr; » .»III I · «II «* · I * · Il I 11 3 1 elements (23) with the plug (1) form- j conclusively" and the other.Part of the spring legs (22) for 5 - - floating fixing of the bracket (19) '-'. ' serves. , \ 10. Plug connection according to one of the claims ^c io ^s Metal shell of the socket (26) with its 1
^y y J *" _tf the end facing the plug (1) V
15 ^ . -' Insulating piece protrudes. ■ ']· .25 .- 30 35