Abstract:
The invention relates to a device for contacting at least one electrical conductor. A clamping contact blade can be passed against the conductor at an acute angle. The conductor can be inserted into a channel of an insulating part, which channel is bent such as to form an acute angle in relation to the conductor.

Description:
CROSS-REFERENCES TO RELATED APPLICATIONS 
     (not applicable) 
     STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
     (not applicable) 
     REFERENCE TO A “MICROFICHE APPENDIX” (SEE 37 CFR 1.96) 
     (not applicable) 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates to a device for contacting at least one electrical conductor. 
     2. Description of the Related Art including information disclosed under 37 CFR 1.97 and 1.98 
     This object is accomplished according to the present invention. 
     BRIEF SUMMARY OF THE INVENTION 
     The object of the invention comprises to further develop a device for contacting at least one electrical conductor in such way that a quickly and safely performable mounting by hand and electrical conductor contacting is accomplished with simple means without loseable small parts such as screws and to the like. 
     This object is accomplished according to the present invention by a heating conductor of a heating cable, characterized in that the end part ( 28 ) of the condductor ( 5 ,  6 ) is slidable into a channel ( 26 ) of an insulator piece ( 20 ) at an acute angle relative to the longitudinal axis ( 27 ) of the conductor ( 5 ,  6 ) and wherein a contact clamping cutting edge ( 15 ,  53 ) is staggered and substantially parallel to the longitudinal axis ( 27 ) at an acute angle pressable against the conductor ( 5 ,  6 ) in the region of the end part ( 28 ) 
    
    
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING(S) 
     Further advantages and essential details of the invention can be gathered from the following description and the drawing, which shows preferred embodiments as an example in a schematic representation. There&#39;s shown in: 
     FIG. 1 a connector bushing in a sectional side elevational view, 
     FIG. 2 a connection sleeve in a sectional side elevational view, 
     FIG. 3 an end bushing in a sectional side elevational view, 
     FIG. 4 the end bushing according to FIG. 3 in a different sectional view, and 
     FIG. 5 a Y-branching in a side elevational view, partially in section. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     This object is accomplished according to the present invention by a heating conductor of a heating cable, characterized in that the end part ( 28 ) of the conductor ( 5 , 6 ) is slidable into a channel ( 26 ) of an insulator piece ( 20 ) at an acute angle relative to the longitudinal axis ( 27 ) of the conductor ( 5 , 6 ) and wherein a contact clamping cutting edge ( 15 ,  53 ) is staggered and substantially parallel to the longitudinal ais ( 27 ) at an acute angle pressable against the conductor ( 5 , 6 ) in the region of the end part ( 28 ). 
     The device according to the present invention illustrated in the drawing is formed according to FIG. 1 as a connector bushing  1 , which exhibits an electrical connection cable  2  on the one side and an electrical heating cable  3  on the oppositely disposed side. The connection cable  2  can be a tubular conductor having a circular cross-section, whereas the heating cable  3 , which is not furnished with an outer protection conductor braid but is formed as a protection insulated heating band with a double or reinforced insulation, having advantageously a flat rectangular cross-section and exhibiting preferably two conductors  5 ,  6 , which are disposed next to each other at a distance. 
     The bushing  1  exhibits a nearly pot shaped clamping cut casing  7 , which has a floor  8  and anullar wall  9 . A casing cap  10  is disposed at the floor  8 , wherein the casing cap  10  co-delimits a connection chamber  11  and wherein the casing cap  10  is advantageously sealingly connected to the floor  8  by a device side ultrasound welding  12 . A sealing ring  14  is integrated in the rear wall  13  of the casing cap  10 , and the connection cable  2  is led into the connection chamber  11  through the sealing ring  14 , wherein the sealing ring  14  sealingly surrounds the connection cable  2 , such that the connection chamber  11  is shielded against outer influences. The casing cap  10  and the sealing ring  14  are advantageously produced by a two component injection molding method. 
     Two contact clamping cutting edges  15  can be disposed in the floor  8  of the clamping cut casing  7 , wherein the distance of the two contact clamping cutting edges  15  from each other is essentially like the distance of the conductor  5 ,  6  of the heating cable  3 . The contact clamping cutting edges  15  penetrate the floor  8  and protrude with their cutting edge  16  into the pot shaped space-of the clamping cut casing  7 . The other end of the contact clamping cutting edges  15  disposed remote relative to the cutting edge  16  is formed as a connection lug or tag  17 , which protrude into the connection chamber  11  and wherein in each case an electric conductor  18  of the connection cable  2  is connected on the device side preferably with a point welding  19  to the connection lug or tag  17 . 
     An insulator piece  20  secured against rotating and a clamping cut bush  21  are disposed in the clamping cut casing  7 , wherein the clamping cut bush  21  is insertable into the insulator piece  20  from the side disposed opposite to the floor  8  and wherein the clamping cut bush  21  is coupled axially shiftable with the latter insulator piece  20  on the device side to a device unit. For this purpose a locking web  22  formed at a base wall  24  of the clamping cut bush  21  is limited slidably supported in a guide recess  23  of the insulator piece  20 . According to the present embodiment the locking web  22  can be pulled out by about from 10 to 15 mm until projections formed at the locking web  22  strike and prevent a further pulling apart of the parts. A passage  25  is formed in the base wall  24  of the clamping cut bush  21 , wherein the heating cable  3  is slipped through the passage  25 . This passage  25  is essentially congruent with a channel  26 , wherein the channel  26  is disposed in the insulator piece  20 . Such as a passage  25 , also the start of the channel  26  runs initially in the plane of the longitudinal axis  27  of the connector bushing  1 . Then, however, the channel  26  bends off with an acute angle of preferably about 20 degrees to 35 degrees and runs at an inclined angle downwardly according to the drawing representation. The cross-section of both the passage  25  as well as of the channel  26  can be formed flat rectangular and can be essentially equal to the cross-section of the heating cable  3 , wherein the end piece  28  of the heating cable  3  is thus disposed under restrictive guidance in the channel  26 . 
     Clamping cutting edges  29  can be disposed at the base wall  24  of the clamping cut bush  21 , wherein the distance of the clamping cutting edges  29  relative to each other is equal to the distance of the two contact clamping cutting edges  15  as well as the distance of the two conductors  5 ,  6  of the heating cable. The clamping cutting edges  29  stand essentially parallel to the locking web  22  and are disposed opposite to the contact clamping cutting edges  15  of the clamping cut casing  7 . It is thereby to be recognized that the cutting edge  30  of the clamping cutting edges  29  is somewhat height level staggered relative to the cutting edge  16  of the contact clamping cutting edge  15  and as that a distance is present between the two cutting edges  16 ,  30 , wherein the distance is smaller than the thickness of the heating cable  3 . The end part  28  of the heating cable  3  is slipped into the channel  26  of the insulator piece  20  up to the stop at the floor  8  of the clamping cut casing  7 . 
     The a clamping cut bush  21  exhibits a lamella ring  31  at the side of the base wall  24  disposed opposite to the locking web  22 , wherein the lamella ring  31  is formed of spring elastic fingers  32 . The fingers  32  of the lamella ring  31  surround a rubber elastic seal  33 , wherein the heating cable  3  is led through the rubber elastic seal  33 . In addition an anullar groove is formed at the circumference of the clamping cut bush  21 , wherein a ring seal  34  preferably formed as an O-ring is disposed in the anullar groove, wherein the ring seal  34  sealingly rests at the inner face of the clamping cut casing  7 . 
     Finally the connector bushing  1  is furnished further with an outer tubular casing part  35 , wherein the outer tubular casing part  35  is furnished with an internal thread, wherein the internal thread engages with an outer thread of the clamping cut casing  7  and is disengageably connected to the clamping cut casing  7  through the thus formed screw threading  36 . A funnel shaped narrowing collar  37  is formed at the one end of the casing part  35 , wherein the collar  37  presses the fingers  32  of the lamella ring  31  in the direction of the longitudinal axis  27  against the seal  33  upon screwing onto clamping cut casing  7 . A web  38  can be furnished at the inner side of the funnel shaped collar  37 , wherein the web  38  engages into a slot formed between the fingers  32 . The front face  39  of the end of the casing part  35  disposed opposite to the collar  37  is disposed at a shoulder  40  formed at the clamping cut casing  7  in the closure position of the connector bushing  1 . As can be further gathered from the drawing, recessed grips  41  can be formed at the casing cap  10  as well as at the casing part  35  capable of being screwed on, such as that the connector bushing  1  can be captured nonskid and slide resistant for the mounting and demounting by hand. 
     Initially the casing part  35  is slid onto the heating cable  3  during the mounting on the side of the customer. Then the end part  28  of the heating cable  3  is slid into the channel  26  of the insulator piece  20  up to the end without any insulating or other preparatory work through the seal  33  and the passage  25  of the clamping cut bush  21 . The insulator piece  20  is thereby pressed away axially so far from the clamping cut bush  21  until the projections of the locking web  22  prevent a further sliding away. Since the channel  26  is bent downwardly at an acute angle, the end part  28  of the heating cable  3  is necessarily correspondingly deflected into the channel  26 . Since the insulator piece  20  is pressed away from the clamping cut bush  21  upon sliding in of the heating cable  3 , there occurs no touching with the clamping cutting edge  29 , since the latter clamping cutting edge  29  initially does not protrude into the channel  26 . Then the insulator piece  20  and the clamping cut bush  21  are inserted into the clamping cut casing  7  in a position restrictively guided against rotation, wherein the conductors  5 ,  6  are disposed in the proper position relative to the cutting edges  16 ,  30 . Then the casing part  35  is screwed on to the clamping cut casing  7 . The insulator piece  20  and the clamping cut bush  21  are thereby slid into the clamping cut casing  7 , until the front face of the insulator piece  20  and the end part  28  of the heating cable  3  strike at the floor  8 . The cutting edges  16  of the contact clamping cutting edge pair  15  from above and the cutting edges  30  of the clamping cutting edge pair  29  from below slide through the not removed insulator jacket  4  of the heating cable  3  into the individual conductors  5 ,  6  during this process, wherein the individual conductors  5 ,  6  are clamped essentially meander shaped between the cutting edge pairs  15 ,  29 . This provides a secure electrical contacting with the contact clamping cutting edges  15 . The clamping cutting edges  29  support the conductors  5 ,  6  and thereby prevent any escaping of the conductors  5 ,  6 . The fingers  32  of the lamella ring  31  are pressed by the collar  37  against the seal  33  upon screwing on of the casing part  35 , wherein the seal  33  sealingly surrounds thereby the heating cable  3 . The casing part  35  is screwed on advantageously to such extent until the front side  39  rests at the shoulder  40  of the clamping cut casing  7 . It is thereby assured that the contact clamping cutting edges  15  are optimally electrically contacted with the conductors  5 ,  6 . 
     The connection sleeve  42  illustrated in FIG. 2 serves for connecting for example to heating cable  3  and is furnished with a double pot shaped clamping cut casing  43 , wherein in each case an anullar wall  9  is furnished at the floor  44  of the double pot shaped clamping cut casing  43  at two oppositely disposed sides. The connection sleeve  42  can advantageously be formed mirror symmetrically relative to a center plane  45  disposed in the middle of the floor  44  and perpendicular to the longitudinal axis  27 . The clamping cut casing  43  can exhibit for this purpose in each case an insulator piece  20 , a clamping cut bush  21 , a seal  33 , an anullar seal  34 , and a screwable casing part  35  at the two sides of the floor  44 . The contact clamping cutting edges  53  disposed in the floor  44  are not furnished with a connection lug or tag, but two cutting edges  16  protruding from the floor  44 , wherein the cutting edges  16  direct into directions disposed opposite to each other for the contacting and the electrical connection of the conductors  5 ,  6  of the two heating cables  3 . The connection of the heating cable  3  on the side of the customer is performed by the connection sleeve  42  sensibly according to the above described connection of the heating cable  3  to the connector bushing  1 . 
     The end bushing  46  of FIGS. 3 and 4 is furnished with a pot shaped plastic casing  47 , wherein the pot shaped plastic casing  47  exhibits support webs  48 ,  49  formed at oppositely disposed wall parts. In addition, an insulating plastic mass  50  is disposed in the plastic casing  47 , wherein the consistency of the insulating plastic mass  50  is gel like. The end of the heating cable  3  is pressed into the gel like plastic mass  50  through the opening  51  of the plastic casing  47  up to the floor wall  52 . The support webs  48  are thereby to some extent bend over by the heating cable  3  in the insertion direction. After the heating cable  3  has been slid up to the floor wall  52 , then the heating cable  3  is to some extent retracted, until that the heating cable  3  passes into the position illustrated in FIG.  3 . Here the free ends of the support webs  48  engage into the insulating jacket  4  of the heating cable  3  and prevent a further pulling back, such that the heating cable  3  is problem free sealed and fixedly positioned in the plastic casing  47 . 
     Three heating bands  3  are furnished in connection with the Y-branching  54  illustrated in FIG. 5. A heating circuit is thus subdivided into two further heating circuits with the branching bush  55 . For this purpose the branching bush  55  exhibits a casing  56 , wherein two sealing rings  14  are integrated in the wall  57  of the casing cap  56 , wherein in each case an electrical connection cable, which can be furnished like the connection cable  2 , is led into the connection chamber  58  through the two sealing rings  14 . Here again the electrical conductors  18  can be attached preferably by point welding  19  at the connection lugs or tags  17  of the contact clamping cutting edges. The remaining part of the branching bush  55  is constructed like the connector bushing  1  for the connection of the heating cable  3 . The two connection cables  2  led out from the branching bush  55  and the other two heating cables  3  are connected as described above in the connector bushings  1 .