AU2008250785A1

AU2008250785A1 - Plug contact pairing

Info

Publication number: AU2008250785A1
Application number: AU2008250785A
Authority: AU
Inventors: Willi Kussel; Peter Rahms
Original assignee: Tiefenbach Control Systems GmbH
Current assignee: Tiefenbach Control Systems GmbH
Priority date: 2007-05-12
Filing date: 2008-05-06
Publication date: 2008-11-20
Anticipated expiration: 2028-05-06
Also published as: PL2149176T3; DE102008022397A1; EP2149176A1; EP2149176B1; DE112008001198A5; AU2008250785B2; WO2008138303A1

Description

Plug contact pairing The invention concerns a plug contact pair according to the generic part of claim 1. 5 This plug contact pairing has general usage and commercially available. It has a cylindrical, mostly circular cylindrical plug receptacle firmly mounted in a machine housing by, for example, screws, and contact pins in the interior of the plug receptacle. The contact pins are parallel with the axis of the receptacle. The 10 movable part of the plug contact has a plug head with contact bushes. Contact pins and contact bushes are joined, for example, soldered, to the ends of electric leads. In this application as machine housing any housing is understood, that accommodates an electrical or electronic equipment, for example electronic computers or electronic control device and is detachably connected with another 15 electrical or electronic equipment, be it a current source or current consumer. To prevent an unintentional pulling out of the plug head from the plug receptacle or falling out due to, for example, vibration, instead of a friction-locked fastening in most cases a form-locked fastening of the plug head in the plug receptacle is provided by, for example, screwing them together in the inserted state. When 20 pulling out the movable plug part from the stationary part this fastening is often troublesome and there is the danger of the detaching being carried out improperly or even leading to damages. According to claim 1 the object of the invention is to provide a fastening that is 25 simple to produce, yet is secure and simple to detach. The further development according to claim 2 has the advantage that the movable plug part, namely the plug head, is also reliably fastened in its plug housing, that the fastenings of the plug head in the plug receptacle on the one 30 hand and in the plug housing on the other are so harmonised that the function of the detachable plug is ensured and can be executed without damaging the plug. The further development according to claim 3 is intended for all plug contact pairings according to the generic part of claim 1, in particular however for the 2 execution according to claim 1 or 2, since it is a simple yet secure construction with small dimensions of a plurality of plug contact pairings for an electronic equipment. 5 The further development according to claim 4 has the advantage that the second movable plug part, namely the plug head, can be also simply and reliably inserted into the stationary part of the second pairing. The further development according to claim 5 is particularly space-saving and 10 therefore can be used for very small electronic equipment. The invention is described in the following based on the drawing of embodiments. They show in: 15 Fig.1 - a simple plug contact pairing, Fig.2 - a double plug contact pairing. 20 The following description applies to both figures: The plug head 1 of the plug contact pairing is firmly mounted in the housing of an electrical equipment machine housing. In its cylindrical interior it has contact pins 31, that are parallel with the axis of the plug receptacle, pass through the bottom of the receptacle and protrude into the interior of the plug head. The ends of the 25 leads 25, 26 are soldered to the ends of the contact pins which protrude from the bottom of the receptacle, facing away from the bottom of the receptacle. The shape of movable plug head 2 corresponds to the interior of the plug receptacle. It has contact bushes 32 aligned parallel with the axis of its cylinder, the contact bushes having the same geometric arrangement as the contact pins in the plug 30 head and are brought into contact by inserting the plug head into the plug receptacle. Because the contact pins and the contact bushes are asymmetrically distributed, a guide pin 6 protrudes parallel with the contact pins into the interior of the receptacle and in the geometrical identical position the plug head has a guide bore 7. The free ends of the contact bushes, facing away from the insertion 3 openings, are soldered to the ends of the electrical leads 25, 26. The electrical leads 25, 26 are guided in the plug housing, facing away from the plug head. That portion of the plug head, which in the inserted state protrudes past the edge of the plug receptacle, is fastened in the interior of the plug housing that is so far 5 congruent. This is achieved by a form-locked fastening. For this purpose a profiled ring, preferably an O-ring, designated as fastening ring 4, with a portion of its section is placed into a circumferential groove on the external circumference at that end of 10 the plug head which is accommodated in the interior of the plug housing. The remainder the section of the fastening ring 4 engages a groove on the internal circumference of the plug housing, while the cross-sectional plane of the plug head, in which the groove is situated, determines the depth of insertion of the plug head in the plug housing. 15 For a form-locked fastening after the insertion of the plug head into the plug receptacle a further profiled ring, preferably an 0-ring, is used, that is designated as retaining ring 5. Part of its cross-section is embedded in a circumferential groove of the plug head and during the insertion of the plug head into the plug 20 receptacle the retaining ring 5 engages with the rest of its cross-section a groove on the internal circumference of the plug receptacle. By doing so, this retaining ring connection, including the grooves and the retaining ring 5, is so constructed with regard to shape and material, that the movable plug head 2 can be pulled out from the plug receptacle 1 mounted in the machine frame only by using a 25 tensile force that exceeds a boundary value. In particular the unintentional falling out of the plug head from the plug receptacle or without human interference is to be avoided. On the other hand the fastening of the plug head 2 in the plug housing 3 by the 30 fastening ring 4 is even "sturdier"; i.e. the fastening ring connection between the plug housing and the plug head, including the grooves and the ring 4 with regards to shape, material and shape of the groove, when compared with the retaining ring connection, including grooves and the ring 5, is so designed that the tensile force, with which the plug head can be pulled out from the plug receptacle, is 4 smaller than that holding the plug head in the plug housing by means of the fastening ring connection. That will also prevent that, when trying to pull out the plug head from the plug receptacle, the plug housing would be inadvertently pulled off the plug head and due to this the ends of the leads, possibly the ends 5 of the contact bushes, would be tom off. For Fig.2 the following additional description applies: The plug housing 3.1 of the first plug contact pairing comprises the stationary part, i.e. the plug head 2.1 of a second plug contact pairing. In the example it is 10 identically constructed with the first one containing the parts 2.2 instead of 2, plug head 1.1 instead of 1, housing 3.1 instead of 3, leads/ends of leads 27, 28 in addition to leads/ends of leads 25, 26, contact pins 31.2 instead of 31, contact bushes 32.2 instead of 32, fastening ring 4.2 instead of 4, retaining ring 5.2 instead of 5. 15 The following peculiarities are particularly valid for the embodiment: The inserting directions are the same for both pairings. The exit directions of the ends of the leads 27, 28 and of the ends of the lines 25, 26 are in the same direction. 20 The first plug contact pairing has lead connections to the contact bushes 32.2 and contact pins 32.2 of the second plug contact pairing. For this purpose in the embodiment the plug receptacle and plug head of the first plug contact pairing have holes 33 for the contact pins 31.2 of the second plug contact pairing that are fastened with the appropriate length in the plug head 2.1 of the second plug 25 contact pairing. The plug receptacle 2.1 is firmly mounted in the plug housing 3.1 of the first plug contact pairing in a recess provided for this purpose. The guide pins 6, 6.2 and guide bores are offset relative one another.

Claims

1. A plug contact pairing comprising a plug head (1) and contact pins (31) in the interior of the plug head, and a movable plug head (2) with contact bushes (32) 5 for the connection of electrical lead ends (25, 26), with a form-locked fastening of the plug contact pairing of plug head and plug receptacle in the inserted state, characterised in that the form-locked fastening of the plug contact pairing comprises a profiled ring, preferably an O-ring (fastening ring), that with a portion of its section is placed into a circumferential groove of the plug head 10 and when the plug contact pairing is closed the rest of its section engages a groove on the internal circumference of the plug receptacle, while the fastening ring connection including grooves and fastening ring with regards to shape and material of the ring as well as the shape of the groove is so constructed that the plug head (2) can be pulled out from the plug receptacle (1) only with a 15 tensile force that exceeds a boundary value.

2. A plug contact pairing according to claim 1, characterised in that the plug head (2) inserted with one end into the congruent end of a movable plug housing (3) is fastened in a form-locked manner by a second profiled ring, preferably an 0 20 ring, (fastening ring 4), whereby the fastening ring (4) with a portion of its section is placed into a circumferential groove on the external circumference of the said end of the plug head and with the rest of its section engages a groove on the internal circumference of the plug housing, while the fastening ring connection, including the grooves and the ring with regards to shape, material 25 and shape of the groove, when compared with the retaining ring connection, is so constructed that the tensile force, with which the plug head can be pulled out from the plug receptacle, is smaller than that holding the plug head in the plug housing by means of the fastening ring connection. 30

3. A plug contact pairing according to the generic part of claim 1, in particular according to claim 1, with a cylindrical plug receptacle with contact pins (31), with a cylindrical plug head with contact bushes (32) to connect ends of leads (25, 26), said plug head having an external cross-section that is congruent with the internal cross-section of the plug receptacle and in the closed state of the 6 plug contact pairing a portion of its length fits into the plug receptacle and the other portion of its length is enclosed by a plug housing, while the plug receptacle with contact pins (31) is firmly mounted in the machine housing, characterised in that the plug housing contains the stationary portion of a 5 second plug contact pairing for contacting additional leads/ends of leads (27, 28).

4. A plug contact pairing according to claim 1, characterised in that the cylindrical plug receptacle of the second plug contact pairing with contact pins (31) and 10 contact bushes is mounted in the plug housing of the first plug contact pairing, said contact pins and contact bushes producing a connection to the ends of two electrical leads (27, 28) via contact bushes (32) and contact pins of the first plug contact pairing. 15

5. A plug contact pairing according to claim 2, characterised in that the direction of insertion of the first plug contact pairing is the same as that of the second plug contact pairing.