Connector for coaxial cable with a corrugated outer conductor

The invention relates to a connector for a ring corrugated Outer conductor having coaxial cable, with a Plug head, the cable end has a conical annular surface, which the inner side contacting the front edge area of ​​the Cable outer conductor is determined, and a cable outer conductor enclosing, sprung open in the radial direction Clamping element which in the mounted state of one with the plug head screwed pressure member enclosed and axially towards the conical annular surface of the connector head is loaded so that the end edge region of the outer cable conductor between the conical annular surface and an opposite surface the clamping element electrically contacted and mechanically is clamped.

A connector of this kind is known from DE-C-198 57 528.. The pressure member is preferably designed as a recess in the connector head be screwed hollow screw adapted but can also take the form of an external thread have the plug head twist-on cap sleeve. In both Cases, the clamping element consists of a contact sleeve, the outgoing through plug-in side of its end, evenly circumferentially distributed, axial slots in radially resilient segments is divided, the thickened cable end who heads the inner surfaces in the mounted state the End edge portion of the annularly corrugated outer cable conductor against an annular surface, preferably a conical annular surface, of Plug head presses. In the embodiment of the pressure member a hollow screw creates a recess in the Plug head in height whose annular surface and in the embodiment the pressure member as a cap sleeve a recess in the latter a free space for the springing of Heads of the contact sleeve when sliding the connector on the cable, act in both embodiments the outer periphery the contact sleeve and the inner periphery of the pressure member formed annular shoulders together so that the contact sleeve before and during assembly of the connector the cable around a Ringwellungsschritt displaced axially sitting in the pressure member, but a concluding at its Bracing with the male head of the front edge area of ​​the The outer cable conductor between the annular surface of the connector head and the mating surfaces of the swollen heads of the contact sleeve is clamped. The Tension is by a sealing O-ring divided into two sections, the first of which a pre-assembly corresponds to what the complete connector dissection and without additional Slide parts onto the coaxial cable (and, if necessary Pull again) leaves. At the end of the assembly process takes the pressure member only with the Plug head over the length of the second Spannwegabschnittes to be screwed.

Connectors of this type have relatively high Manufacturing costs. The reason for this is not a negligible Measure the described contact sleeve. To them in the Connectors accommodate, this does not have a unterschreitbaren minimum diameter and a cable end have certain minimum length. In addition, the contact sleeve requires even numerous manufacturing steps.

The invention has the object of providing a connector to create the kind mentioned above, the while retaining its dissection free mountability can produce at a lower cost.

This task is introduction at a connector with the -mentioned features according to the invention by the characterizing Part of claim 1. stationary characteristics dissolved.

The core of the invention is the clamping member instead form a contact sleeve as slotted contact ring and construction moreover be adjusted so that this contact ring, the mechanical and electrical function satisfies the contact sleeve according to the prior art. As A result, reduces the outer diameter of the About the connector head to the value of the larger diameter the conical annular surface, that is only slightly larger than the Diameter of the outer cable conductor in the region of a wave crest. The contact ring is furthermore fully in Interior of a sleeve formed with an internal thread pressure member housed, in contrast to the contact sleeve known connector of this kind, at least in the disassembled partially the pressure member on the cable side survives. Above all, the contact ring is a simple Rotary part with correspondingly low manufacturing costs and short overall length in comparison with a contact sleeve, such that also the axial length of the threaded sleeve as compared to the significantly reduced previous design of the pressure member.

Suitably, the clamping ring has a cross section corresponding a triangle with a blunted tip (claim 2). Of the The clamping ring is so chamfered on its inner circumference, so that their profile the Wellungsprofil the outer cable conductor better is adapted. As a result, the outer diameter of the clamping ring, and thus the dependent outer diameter both of the threaded sleeve and of the connector head be reduced.

The transition between the larger diameter and the smaller diameter of the inner groove of the threaded sleeve can conically formed (claim 3), either by a facet or a rounding of the cable-side Flank of the inner groove with the larger diameter. alternative can the (cable side) opposite surface of the clamping ring provided with a facet or rounded. In both Cases it is achieved that the threaded sleeve at the (further) Screwing on the plug head, starting from the pre-installation condition Connector, the clamping ring in the radial Towards increasingly compressed and simultaneously towards the Kelgelringfläche Connector pushes.

Preferably, the plug head, axially spaced from its cable-side end face by about half the distance between two consecutive wave crests of the outer cable conductor, a circumferential annular shoulder, according a reduction of the male head inside diameter of the diameter of the cable dielectric on the conservation a constant characteristic impedance required Value (claim 4). The magnitude of this jump in diameter depends, as usual, on the diameter of the connector internal conductor and the type of dielectric between the latter and from the inner wall of the connector head.

For sealing the interior of the connector, the Plug head mating side of its external thread has a circumferential groove have the depth less than the diameter an inserted into the groove the O-ring (claim 5).

In particular, this circumferential groove may have a pre-mounted state define, in which the plug-side end edge of the sleeve abuts against the O-ring and in the inner groove with the recorded larger diameter clamping ring between its Shoulder surface and the conical annular surface of the connector head a circumferential gap for receiving the end edge portion of the Outer cable conductor leaves free.

The proposed design of the connector allows it in certain standardized types, including the type 7-16 to the Outer diameter of the connector head to the inner diameter adapt the standard, plug-in side Schraubüberwurfes such that the Schraubüberwurf from the cable side to the plug head can be postponed. The Schraubüberwurf then sitting without further mechanical measures captive on the plug head, the smallest inner diameter the former is equal to the outer diameter of the latter plus a tolerance gap (claim 7).

In order to seal the plug on its cable side, an elastic gasket may be disposed in the sleeve be that has an annular lip at least after the pushing of the connector on the cable into a Corrugation of the outer cable conductor comes to rest and the after tightening the connector to the cable by Screw the threaded sleeve onto the plug head the cable outer conductor tightly encloses approximately the height of a wave crest (Claim 8). This is the opposite connector the cable reliably sealed without additional parts. If is omitted this advantage, the Sealing even in the usual manner by means of a separately as Part pushed onto the cable jacket O-ring or by spraying with a polymerizing sealant be accomplished.

the profile seal in the sleeve advantageously is positively set (claim 9), for example by complementary profiles the corresponding inner wall portion of the sleeve and the outer circumference of the profile seal.

In particular, the gasket can sleeve-shaped be and facing the cable side, spaced axially of their lips, have another lip least, which is intended for sealing engagement with the cable jacket (Claim 10).

In the drawing, an embodiment of a connector according to the invention schematically and in longitudinal section, shown. It shows:<dl tsize="7"><dt>figure 1</dt><dd>the connector in the pre, with enlarged detail "X"</dd><dt>figure 2</dt><dd>the same connector after pushing on the end of a coaxial cable and</dd><dt>figure 3</dt><dd>the connector after assembling on the coaxial cable.</dd></dl>

The connector shown in Figure 1 includes an in Essentially hollow cylindrical plug head 1, one Connector inner conductor 2 encloses, in turn, in an insulating material support 3 is held. Plug side has the connector inner conductor in this embodiment, a pin 21. The cable-side end of the connector inner conductor 2 is for insertion into a tubular Cable inner conductor (see. Also FIG. 2) gradually tapers formed and carries a slightly conical and in radially resilient contact pot 22. This training of the plug connector inner conductor is not part of the Invention.

The plug head 1 ends the cable end in a conical annular surface 11, from the cylindrical circumferential surface of the Plug head 1, starting on the mantle of an imaginary Cone is, the tip of which the cable side of the connector head 1 by dashed lines on its longitudinal axis AA shown lies. At the radially inner, blade-like edge the conical annular surface 11 follows the peripheral surface a recess at 12, as a larger diameter the subsequent cylindrical interior space 13 of the connector head 1 has. The diameter of the recess 12 is substantially equal to the diameter of the cable dielectric (see FIG. Fig. 2). The plug head 1 has on the outside of the terminal the conical annular surface an external thread 14, one to Groove 15 extends, in which an O-ring 5 is inserted, whose Diameter in the unloaded state is slightly larger than the Depth of the groove 15 is.

In the shown pre-assembled state on the external thread 14 of the plug head 1 a with a corresponding Internally threaded threaded sleeve 4 so far screwed, that their plug-side end face on the very O-ring 5 is pending. The threaded sleeve 4 has a first internal groove 4.1 whose plug-side edge in this preassembled State approximately at the level of the blade-like edge of the conical annular surface 11 is. This inner groove 4.1 goes into a second Inner groove 4.2 with a smaller inner diameter on. Of the Transition is designed as a ramp 4.3.

In the inner groove 4.1 is loosely fitted a clamping ring 6 of a spring-elastic metal alloy, such as bronze. At a Point on its circumference, the clamping ring 6 has a slot 6.1. Instead, as depicted axially, the slot can also obliquely, ie at an angle of eg 45 ° to the longitudinal axis AA Connector, run. The clamping ring 6 has an approximately triangular cross-section with inwardly facing Tip but broken by a chamfer 6.2, see. detail "X".

The cable side of the inner groove 4.2 has the threaded sleeve 4 an enlarged inside diameter and a re-entrant Collar 4.4 for the positive reception of a sleeve-shaped Gasket 7, the plug-side at its end to a re-entrant annular lip 7.1 and at its cable-side End to a second entrant annular lip formed 7.2.

2 shows the same connector after pushing on the made-up fits the end of coaxial cable, comprising a tubular inner conductor cable 50, a Cable dielectric 51, an annular corrugated cable outer conductor 52 and a cable sheath 53 includes.

The plug-side end edge of 52.1 in height of a wave crest the outer cable conductor 52 remote (truncated) Cable was previously not a simple, here Tool shown slightly flared. The front edge region the outer cable conductor 52 takes the subscribed Position between the conical annular surface 11 of the connector head 1 and the conical counter-surface 6.3 of the clamping ring 6 a, after the front edge 52.1 by running onto the conical Annular surface 6.4 of the clamping ring 6 (see FIG. "X" in Fig. 1) this has expanded in the radial direction, so that the End edge of the outer cable conductor 52 of the chamfer of 6.2 Collet 6 pass or the clamping ring 6 with its 6.2 chamfer on the end edge 52.1 of the cable outer conductor 52 during the pushing on the connector on the cable end could slip away. Before the end edge has 52.1 the outer cable conductor 52, the first lip 7.1 of the sleeve-shaped Profile seal 7 and then the cable sheath 53, the second lip 7.2 displaced radially outwards. The the Cable facing surfaces of both lips of the profile seal 7 are this bevelled accordingly, ie in the manner of Conical ring surfaces formed.

Simultaneously, the connector inner conductor 2 occurs with its cable end into the tubular inner conductor cable 50 a, which in the region of its front edge by the is contacted Contact Pot 22nd

For the final assembly of the plug on the end of the coaxial cable is the threaded sleeve 4 via the O-ring 5 also screwed onto the plug head 1, to a predetermined is achieved tightening torque. This fully assembled State is shown in Fig. 3.

During the screwing of the threaded sleeve 4 in the Plug head 1 initially the rounding 4.3 clamping ring 6 is shifted in the direction of the plug head 1 and at the same time so far compressed in the radial direction that the second inner groove 4.2 now extends over the clamping ring 6 and closely surrounds. With the last rotations of the threaded sleeve 4 is the cable-side edge of the inner groove 4.2 in contact with the cable-side edge of the clamping ring 6 come the thus, compressed to the inner groove 4.2 predetermined inner diameter in the axial direction, with its surface 6.3 against the front edge portion of the outer cable conductor 52 pressed, whereby the latter with the Annular surface 11 of the connector head electrically contacts 1 and mechanically clamped between surfaces 11 and 6.3 becomes. In this state, the interior of the connector on the one hand by the O-ring 5 and on the other hand by compressed in the radial direction and lips 7.1 7.2 of the profile seal 7 sealed.

The proposed design allows eg in a Connectors on the standard type 7-16 the outer diameter to hold the plug head 1 is so small that a Schraubüberwurf 30 with the standardized dimensions of the cable side pushed onto the plug head 1, w can be grounded, and then by screwing the threaded sleeve 4 also is held captive on the cable side, without a further mechanical securing required, unlike the same type connectors existing design type, where the plug head by design a larger outer diameter has, so it at the level of Schraubüberwurfes provided with a circumferential groove and at the Schraubüberwurf an inner collar formed by rolling in this circumferential groove had to become.