Abstract:
A coaxial plug connector comprises fist and second receiving chambers which are surrounded by first and second metal sleeves, respectively. The first metal sleeve is made up of first and second half shells which are placed one on top of the other. The second metal sleeve is inserted in the first half shell.

Description:
TECHNICAL FIELD  
         [0001]    The invention relates to a coaxial plug connector comprising first and second receiving chambers which are surrounded by first and second a metal sleeves, respectively.  
         BACKGROUND OF THE INVENTION  
         [0002]    Arranged in the interior of the coaxial plug connector is usually an inner conductor which extends from the one to the other receiving chamber. A cable can for instance be connected to one end of the inner conductor, and a further coaxial plug connector can be plugged into the other end. The two metal sleeves provide here for a continuous shielding between the two receiving chambers.  
           [0003]    With all known constructions of such coaxial plug connectors there is the problem of how the inner conductor can be arranged in the interior of the coaxial plug connector and anchored there with an as low an expenditure as possible.  
           [0004]    It is the object of the invention to further develop a coaxial plug connector of the type initially mentioned to the effect that particularly low manufacturing expenses are achieved.  
         BRIEF SUMMARY OF THE INVENTION  
         [0005]    According to the invention, a coaxial plug connector comprising first and second receiving chambers which are surrounded by first and second metal sleeves, respectively. The first metal sleeve is made up of first and second half shells which are placed one on top of the other. The second metal sleeve is inserted in the first half shell. The invention is based on the basic idea to divide the coaxial plug connector into two subunits which be manufactured separately from each other. It is during assembly that the inner conductor can then be inserted in one of the subunits; the inner conductor will then automatically be fixed with the attaching of the second subunit.  
           [0006]    According to the preferred embodiment of the invention it is provided for that the first and second half shells are latched with each other. In this way the two half shells are secured to each other already during their assembly, so that a high positional accuracy is produced.  
           [0007]    In particular, provision can be made in that one of the first and second half shells has a cut-out and the other half shell has a retaining lug engaging into the cut-out. This allows a particularly simple and attractively-priced securing.  
           [0008]    According to the preferred embodiment of the invention provision is made that a crimping sleeve is attached to the first metal sleeve so as to be arranged at a distance from the latching point of the two half shells, the crimping sleeve securing the two half shells to each other. In this way the two half shells can be secured to each other in a particularly easy manner by means of simple method steps which are easily to automate: There is only the need of hanging the one half shell with its retaining lug into the other half shell, slipping the crimping sleeve over the two half shells and crimping it.  
           [0009]    According to the preferred embodiment of the invention provision is made that the second metal sleeve is flanged in the interior of the first half shell. In this way the second metal sleeve can be attached in the first half shell in a particularly simple manner.  
           [0010]    According to the preferred embodiment of the invention provision is made that arranged in the interior of the second metal sleeve is a first dielectric plastic body having a mount in which an inner conductor is arranged. The first plastic body can be injected into the second metal sleeve and anchored there in an easy manner. In particular, provision is made here that the second metal sleeve is provided with a plurality of small passage openings through which the fast plastic body extends as far as to the outer side of the second metal sleeve.  
           [0011]    According to the preferred embodiment of the invention a second dielectric plastic body is provided so as to be arranged in the second half shell. Together with the first plastic body extending preferably as far as into the first half shell, the second plastic body can fill up the receiving chamber in the first metal sleeve in a suitable manner and, for example, form therein a strain relief for a cable which can be fixed in the inner conductor by crimping.  
           [0012]    It is preferably provided for that the first and second plastic bodies are latched with each other. Provision can be made, in particular, that one of the plastic bodies has a protrusion which engages into a recess in the other plastic body. In this way the plastic bodies secured to each other, so that a higher stability of the first metal sleeve is produced.  
           [0013]    According to the preferred embodiment of the invention provision is made that the second plastic body rests at the inner conductor such that the latter is firmly held in its mount. This makes it possible to arrest the inner conductor in the first plastic body without further measures solely by placing the second half shell onto the first one, pressing against the inner conductor by means of the second plastic body arranged in it.  
           [0014]    The first and second half shells preferably overlap each other along their longitudinal edges at least in part, and the second metal sleeve overlaps the first half shell. This ensures a particularly good HF shielding, because the two) metal sleeves are completely closed in circumferential direction with no gap existing between them.  
           [0015]    According to the preferred embodiment of the invention provision can be made that the first and second metal sleeves are arranged at right angles to each other, i.e. a right-angled coaxial plug connector being formed. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0016]    [0016]FIG. 1 shows a coaxial plug connector in a perspective view;  
         [0017]    [0017]FIG. 2 shows in an exploded view the components of the coaxial plug connector of FIG. 1;  
         [0018]    [0018]FIG. 3 shows in a perspective view the first metal sleeve, the second metal sleeve and the crimping sleeve of the coaxial plug connector of FIG. 1; and  
         [0019]    [0019]FIG. 4 shows the coaxial plug connector of FIG. 1 in a sectional view. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
       [0020]    [0020]FIG. 4 shows a right-angled coaxial plug connector which has a first receiving chamber  10  and a second receiving chamber  12 . These arm surrounded by a fist metal sleeve  14  and a second metal sleeve  16 , respectively.  
         [0021]    The first metal sleeve  14  is constituted by a first half shell  18  and a second half shell  20 . The left-hand half of the first half shell  18 , regard the Figures, is realized so as to have a slightly smaller width, whilst the second half shell  20  is formed continuously with the same width, namely the width of the right-hand half of the first half shell  18 . The second half shell  20  has its left-hand half provided with two skirts  22  which overlap the area with reduced width of the first half shell  18 . In the right-hand half regarding the Figures, the first and second half shells  18 ,  20  rest against each other in butt contact, so that the cylindrical receiving chamber is formed.  
         [0022]    The left end of the first half shell  18 , regarding the Figures, is provided with a cutout  24  which is engaged by a retaining lug  26  on the second half sell  20 . The cut-out  24  together with the retaining lug  26  forms a hinge between the two half shells.  
         [0023]    Inserted in the first half shell  18  is the second metal sleeve  16 , to be precise on its underside facing away from the second half shell  20 . For being fixed in the first half shell  18  the second metal sleeve  16  is provided with a flanged edge  28 .  
         [0024]    Arranged in the interior of the second metal sleeve  16  and the first half shell  18  is a first plastic body  30  made of a dielectric material. The plastic body  30  is injected in the second metal sleeve  16  and the first half shell, which both are provided with small passage openings  32  through which the first plastic body  30  extends as far as to the outer side of the second metal sleeve  16  and of the first half shell  18 , too. Formed in the first plastic body  30  is a mount  34  which is made in the nature of a stepped bore and has a receiving nut  35  in the area of the half shell  18 . A metallic inner conductor  36  with a 90° bend can be inserted in the mount  34  and has an arresting collar  38 . The end of the inner conductor pointing downward with respect to the Figures is configured as a plug-in portion, and the end pointing to the right as a crimping portion  39 ,  
         [0025]    A second plastic body  40 , which likewise is made of a dielectric material, is injected into the second half shell  20 . The second plastic body likewise extends through small passage openings in the second half shell  20  as far as to the outer side thereof. Further, there are provided grooves for a strain relief.  
         [0026]    The first plastic body  30  and the second plastic body  40  are each provided with several grooves  42  which put together form a strain relief for a cable. Furthermore, the first plastic body  30  is provided with two protrusions which engage into complementary recesses  46  in the second plastic body  40 .  
         [0027]    Finally, there is provided a crimping sleeve  48  which is slipped on the right-hand half of the first half shell  18  and of the second half shell  20  and can be crimped there.  
         [0028]    Producing the coaxial plug connector described is performed in the following way: First the two half shells  18 ,  20  are stamped and deep-drawn. Subsequently the second metal sleeve  16  is inserted in the first half shell  18  and is flanged there. Then the first plastic body  30  is injected into the second metal sleeve  16  and the first half shell  18 , and the second plastic body  40  is injected into the second half shell  20 .  
         [0029]    Afterwards a cable can be inserted in the crimping portion  39  of the inner conductor  36  and fixed there by crimping. The inner conductor  36  thus prepared is then inserted in this condition into the mount  34  in the first plastic body  30  in such a manner that its arresting collar  38  rests at to step of the stepped bore of the mount  34  and the crimping portion lies in the receiving groove  35 . The second half shell  20  is then placed on the fist half shell is, by hanging the retaining lug  26  of the second half shell  20  into the cut-out  24  of the first half shell  18 . To this end the second half shell  20  is placed on the fist half shell  18  from above in oblique direction. After having hung in, the second half shell  20  can be tipped down onto the first half shell  18 , the skirts  22  overlapping the left-hand half of the first half shell  18  and the recesses  46  of the second plastic body  40  reaching over the protrusions  44  of the first plastic body  30 . In this way the second half shell  20  is locked to the fist half shell  18  in longitudinal and transverse directions. In this arrangement, the second plastic body rests on the crimping portion  39  of the inner conductor  36 , so that the latter is firmly arrested in the mount  34  and the receiving groove  35 . At the same time the grooves  42  of the plastic bodies engage on the cable, provided in the crimping portion  39 , and retain it, so hat a strain relief is formed.  
         [0030]    Subsequently, the crimping sleeve  48  is slipped on the right-hand half of the fist half shell  18  and of the second half shell  20  and is crimped there. The crimping sleeve  48  ensures that the second half shell  20 , in the area of its right-hand half, can not be lifted off from the first half shell  18 ; in thc area of the left-hand half the hinge, formed by the retaining lug  26  and the cut-out  24 , ensures that the two half shells are firmly connected with each other. Further, the crimping portion make available both the strain relief through the dielectric plastic body and a reliable shielding transfer of a shielding braid of the cable to the metal sleeve  14 .  
         [0031]    The coaxial plug connector formed in this way shows a particularly good RF shielding. The second metal sleeve  16  is closed all round, so that a complete shielding is guaranteed here. The small passage openings  32  do not have a detrimental effect on the RF shielding, because their diameter is smaller than the wavelength of the RF radiation. A perfect RF shielding is also achieved in the area of the first and second half shells  18 ,  20 . In the left-hand half of the two half shells, regarding the Figures, the half shells overlap each other due to the skirt  22 . In the area of the right-hand half, the crimping sleeve  48  closed all round ensures the good shielding effect. In spite of the good RF shielding the coaxial plug connector can be produced and assembled in a particularly easy manner, as there are only required few assembling stops which can easily be automated.