A CONNECTOR WITH SECONDARY LATCHING AND WITH A LATERAL CABLE OUTLET

Abstract: The invention relates to a connector (1) with secondary latching comprising a handle (2) for filling slots (3a, 3b) into each of which a tongue (4a, 4b) with a latch (5a, 5b) is inserted. The handle (2) engages a plug part (21) in a first position (I) in which the slots are not filled by two arms on the handle, and is mounted so as to be movable transversely to the plug axis into a position (II) in which the arms can be pressed into the slots (3a, 3b) and locked in a second position (II). Furthermore, the invention relates to a connector with a lateral cable outlet comprising a plug part (1) having an attachment (2) and an adjacent casing which is flat transversely to the direction of insertion. The cable outlet (40) has a two-part clamping device (50a, 50b) which firmly clamps the cable (46) at the outlet of the casing, and an upper hollow substantially semicylindrical groove (50a) with retaining ribs (47) is formed in an attachment (48) integral with a lid (45) of the casing and having two vertical side walls (51a, 51b). A second hollow semicylindrical clamp (49) is secured to the casing by retaining ribs (47) so as to be latchable at the insides of the side walls.

Description: A CONNECTOR WITH SECONDARY LATCHING AND WITH A LATERAL CABLE OUTLET The invention relates to a connector with secondary latching according to the preambles of claims 1, 7, 13 and 17. Connectors of this kind are used e.g. in the motor industry in order to produce electric connections which meet exacting requirements. The requirements relate on the one hand to the reliability with which such a connection must be made and on the other hand to protection against inexpert handling of the connector. The secondary latching is designed to ensure that when the latch closure has engaged, its position is subsequently secured so that the connection cannot be acci¬ dentally broken, e.g. by pulling the connection cable in question. On the other hand the secondary latching can be designed so that it also engages and can subsequently be released by hand or only with a special tool . This prevents unauthorised opening. These requirements apply particularly to passenger-retaining systems in motor vehicles, where the connector connects the trigger of an airbag propelling charge, e.g. in the impact cup of a steering wheel, to the vehicle power circuit. During assembly of conventional con¬ nectors of this kind, problems occur regarding clear recog¬ nition of the state in which the connector is in during as¬ sembly. In other words sometimes the person installing the airbag is not sure whether actuation of the secondary-device handle will engage it in the locked position or whether it has already engaged and therefore cannot be correctly in¬ serted. If this happens at an unduly early stage during installation, during subsequent assembly and particularly when the electric power system starts up, the ignition charge may be subjected to voltages which trigger the airbag system. This may result in dangerous injury to the fitters, or the circuit may not be closed in which case the airbag will not operate. In addition, even when relatively strong forces act on the handle of the secondary latching, engagement in the locked position should be possible only if expressly desired. The purpose is e.g. to avoid faulty operation during transport and handling. The present invention further relates to a connector with a lateral cable outlet of the kind described in the preamble of claim 17. Connectors of the aforementioned kind, with a lateral cable outlet and a casing which is flat in the di¬ rection of insertion, are used whenever it is necessary, for reasons of space, to bend the connecting cable by about 90° from the axis of the connector, immediately behind the plug attachment. A situation of this kind occurs e.g. with ig¬ nition plugs for airbag-retaining systems, where the airbag and the ignition mechanism are disposed on the impact cup of the steering wheel, where the overall height is restricted. In the case of connectors with a lateral cable outlet and a flat casing, there is always a risk that their cable will be pulled out of the mating connector. Although this method of disengaging the connector is not according to specifica¬ tions, precautions must be taken to reduce the damage in this case to a minimum. This means that the plug casing must not be torn apart and possibly irreversibly deformed by the resulting lever forces. It is also necessary to prevent the cable ends from being partly or completely disconnected from the backs of the plug. The object of the invention therefore is to propose a connector with secondary latching and having a state on W assembly which is clearly defined at all times and has maximum reliability for avoiding unintentional premature latching. The further object of the invention is to improve a connec¬ tor according to the invention with a lateral cable outlet so that when an axial or oblique pull is exerted on the cable end, it is effectively protected from disconnection and damage to the casing. These problems are solved according to the claims. Advan¬ tageous embodiments of the invention are specified in the sub-claims . In order to show the fitter the exact position in which the connector according to the invention is, there are two en¬ gaged positions - a first position in which the secondary latching is not yet operative, so that the plug can still be pulled out, and a second position in which the connector is latched and a special tool may be needed to release the handle . According to another feature of the invention, a locking slide is provided in the lid of the casing of the connector, so as to prevent the secondary latching being pressed down out of the assembly position into the latched position unless the locking slide is deliberately pushed sideways. This reliably prevents accidental final latching during assembly. Alternatively the handle is disposed so as to be movable transversely to the direction of insertion, so that in the assembly position the handle cannot be pressed into the latched position, this being possible only after being deliberately moved sideways into a position in which the handle can be pressed into the latched position. These features ensure that faulty operation during assembly is substantially prevented, and during assembly the fitter will always know the exact state of the connector when in¬ stalled, so that it cannot be latched prematurely. The invention will now be explained in detail by a descrip¬ tion of preferred embodiments with reference to the drawings in which: Fig. 1 shows an embodiment of a connector according to the invention in section and in the assembly and in the latched position; Fig. 2 shows a variant of the embodiment in Fig. 1, in the assembly position; Fig. 3 is a view in cross-section of a connector according to the invention with a locking slide for preventing premature latching; Fig. 4 shows the latching-preventing means in Fig. 3 m plan view; Fig. 5 shows an alternative latching-preventing means in perspective view; Fig. 6 shows the latching-preventing means in Fig. 5 in three latch positions; Fig. 7 is a perspective view of the connector according to the invention and Fig. 8 is an exploded view of the connector in Fig. 7. Fig. 1 is a longitudinal section through a connector 1 com¬ prising a plug part 10 and a socket part 7. The socket part 7, in the case of an airbag-retaining system, is a part of the casing of the ignition mechanism. On each side of the plug axis 6, the plug part 10 has tongues 4a, 4b which en¬ gage in corresponding slots 3a, 3b in the socket part 7, where latches 5a, 5b engage in undercuts in the slots 3a, 3b. In the case shown here, the latches have sloping flanks on each side, so that after engagement, the plug part 10 can be pulled out by pulling it strongly. The slots 3a, 3b have a width such that after the latches 5a, 5b have engaged be¬ hind the tongues 4a, 4b an additional slot 9a, 9b for re¬ ceiving the locking arms 2a, 2b of the handle 2 is formed in the direction of the plug axis 6. Fig. 1 shows the handle 2 in the assembly position A on the right half and in the latched position B on the left half. In the assembly position, the locking arms 2a, 2b are not received in the slots 9a, 9b. On each side the lateral wings 11a, lib surround the plug part 10 and the latch hooks 12a, 12b engage in corresponding grooves formed in the side walls of the plug part 10, so as to lock the handle 2 in this assembly position. In this position, therefore, the plug part 10 can be fitted on the socket part 7, and can also be released from this position by strong pulling, since the latches 5a, 5b can pivot out of the corresponding undercuts. This situation is shown in Fig. 2, which clearly shows that the tongues 4a, 4b pivot in the free slots 9a, 9b. In order finally to latch the connector 1, the handle 2 is pressed in the direction for insertion, so that the sloping end faces of the latch hooks are pressed out of the slots 13a, 13b, slide along the side walls of the plug part 10, and finally are latched to the lower edge of the side walls of the plug part 10. In this position the locking arms 2a, 2b have entered the slots 9a, 9b and prevent the latches 5a, 5b from swinging back, thus ensuring that the connector has actually been latched. The handle 2 can be latched to the lower edges of the side walls of the plug part 10 in such a manner that a special tool is necessary for releasing it. Fig. 3 shows the plug part 10 in longitudinal section. The cable outlet is shown on the right side and a chamber e.g. for a choke is provided on the left side. The handle 2 is on the plug axis 6 and is shown in Fig. 3 m the assembly po¬ sition, i.e. the locking arms 2a, 2b are not completely inserted into the slots 9a, 9b. The locking slide 30 pre¬ vents the handle 2 from being pressed into the latched po¬ sition. The slide is mounted in a groove 31 m the casing lid 32 so as to be movable transversely to the direction 6 of engagement and can be moved between a locking position and a position in which it enables the handle 2 to be in¬ serted. In the locking position, the locking slide 30 is engaged by suitable latches 29 on the lid and on the slide. On its surface, the locking slide 30 has grooves 34 which facilitate sliding thereof and enable the locking slide to terminate flush with the lid surface, so that the resulting connector has a very flat construction, particularly since the transverse strut 20 of the handle 2 is also lowered into the groove 31 in the latching position. A pm 33 is disposed on the underside of the transverse strut 20 and in the assembly position adjoins the locking slide. Its length is chosen so that in this position the tips of the locking arms 2a, 2b just extend into the slots 9a, 9b. Fig. 4 is a plan view of the locking slide 30 on the casing lid. The drawing shows an alternative means of securing the locking slide 30, two recesses 39 being provided at the side in the groove 31, for a latch 36 disposed in the side wall of the locking slide 30. In the final latched position, the handle 2 along with the locking slide 30 can be pressed down so far that its surface is flush with the casing lid sur¬ face . Fig. 5 shows an alternative embodiment preventing accidental latching of the handle in the final position. In this embo¬ diment the complete handle 2 is moved sideways in a groove 13b transversely to the direction of insertion 6, into a position in which the locking arms 2a, 2b can enter the slots 9a, 9b. Fig. 5 shows the lateral groove 13b, in which the wings 11a, lib of the handle 2 are guided. Ribs 23 bound the lateral travel distance and prevent any accidental pres¬ sure on the handle 2 from spreading out the wings 11a, lib in a position in which the locking arms 2a, 2b cannot enter the slots 9a, 9b. In addition the connector is constructed so that in the initial latch position the locking arms 2a, 2b additionally or alternatively extend upwards from the base of the casing and accidental actuation is impossible. The casing and the inside of the wings 11a, lib are formed with knobs and recesses 25, 26, so that it is possible to detect when the handle is latched in the intermediate posi¬ tion. Latching of this kind is optional and can be omitted if required. Figs. 6a to 6c show a perspective view of the connector according to Fig. 5 in the initial latching position (Fig. 6a) in which the handle 2 cannot be pressed down. In order to reach the final position, the handle 2 must first be moved sideways into the position shown in Fig. 6b, so that it can then be pressed down into the end position (Fig. 6c) . As can be seen, in this version also the handle 2 is flush with the surface of the connector casing lid, so that the connector is flat. Fig. 7 shows a plug part (1) as a whole comprising an attachment 10 inserted into a complementary plug (not shown) and also comprising a flat casing. The lateral cable outlet is shown on the right side. A cable 46, indicated by chain lines, comes out of the cable outlet 40 The upper part of the connector is covered by a lid 44. A locking handle 45 extends through the lid down to latching arms which extend parallel to the plug attachment, in order to secure the connector after installation The cable outlet 40 has a two-part clamping device 50a, 50b which will be explained in detail hereinafter. A part of the clamping device 50a comprises a hollow semicylindrical groove formed with retaining ribs 47. A cable 46 is inserted in the groove and, when the casing components are fitted together in the specified manner, the retaining ribs are partly pressed into the cable sheath transversely to the cable axis. The upper part 50a of the clamping device is m the form of a side attachment 48 moulded m one piece on the lid 44 and has an upper wall 60, the underside of which is formed with the upper groove 50a in its centre The attach¬ ment 48 also has two vertical side walls 51a and 51b Lat¬ ches are formed on the insides of the side walls 51a and 51b and cooperate with corresponding complementary detents 53 The detents 53 are on the second part of the clamping device 50b, which is likewise in the form of an attachment or clamp 49 integral with the casing. The clamp 49 likewise has a central semicylindrical groove with retaining ribs 47 form¬ ing the counterpart to the groove 50a, the cable 46 being clamped between them. On the two sides of the groove 50b the clamp has two arms 56, substantially following the contour of the inner side walls, and their lower outer ends are flush with the lower edges of the vertical side walls 51a, 51b of attachment 48. The detents 53 and the corresponding latches 52 are disposed closely above the lower end of the side walls 51a, 51b or the arms 56. Preferably, the arms 56 are prestressed slightly outwards when cast, so that when the attachment 48 is locked to the clamp 49, the detents 53 are pressed into the latches 52. If a force is exerted on the lid 54 by an obliquely upward or backward pull in opposition to the direction of inser¬ tion, tending to loosen the lid from the casing, application of a force in this direction will press the detent 53 more deeply into the corresponding latch 52 and, if the side walls 51a, 51b yield outwardly, the arms 56 will follow the yielding movement, with the result that the detents 53 can¬ not be removed from the latches; on the contrary, the two parts of the clamping device are joined together even more firmly. The greater the pull from the direction of the lid and the further the side walls or arms of the clamp move apart, the more firmly the locking device spreads into the undercut of the lid. This ensures that the parts of the casing cannot come loose and the cable cannot be pulled out in the axial direction, since the parts of the clamping device 50a, 50b always re¬ main firmly pressed together. The preceding description of embodiments of the invention should not be regarded as limitative but only by way of illustration.

Claims: C L A I M S 1. A connector (1) with secondary latching comprising a handle (2) for filling slots (3a, 3b) , a tongue (4) and latch (5) being inserted into each slot, characterised in that the handle (2) is latchable on a plug part (21) in two positions, a first position (A) in which the slots (3a, 3b) are not filled by the handle (2) , and a second position (8) , in which the handle (2) fills the slots (3a, 3b) . 2. A connector according to claim 1, characterised in that the plug part has at least two tongues (4a, 4b) and latches (5a, 5b) disposed opposite one another and parallel to the plug axis (6) , and a socket part (7) has correspondingly disposed slots (3a, 3b) for receiving the tongues (4a, 4b) and for latching the latches (5a, 5b) to correspondingly situated shoulders (8a, 8b) , and second slots (9a, 9b) are so disposed between the plug attachment and the tongues (4a, 4b) that two locking arms (2a, 2b) on the handle (2) hold the tongues (4a, 4b) along the plug axis (6) and press the latches (5a, 5b) on the tongues (4a, 4b) non-releasably into an undercut on the shoulders (8a, 8b) . 3. A connector according to claim 2, characterised in that the back of the plug part (21) is surrounded by two wings (11a, lib) of the handle (2) which extend over the side walls thereof, and the lower ends of which end in hooks (12a, 12b) which in a first position engage in grooves (13a, 13b) in the side wall of the plug, the arms (2a, 2b) not being inserted into the slots (3a, 3b) , whereas in a second position they engage under the lower edge (13) of the side walls in order to lock the handle (2) in the position where the tongues (4a, 4b) are locked. 4. A connector according to any of the preceding claims, characterised in that the plug part (21) is flat with a bent cable outlet, and the handle (2) in the second position is incorporated into the contour of the back wall of the plug part. 5. A connector according to any of claims 2 to 4 , characterised in that the tongues on the plug part (6) can be inserted into the corresponding slots (3a, 3b) in the socket part only when the handle (2) is in the first posi¬ tion. 6. A connector according to any of the preceding claims, characterised by use thereof in a retaining system in motor vehicles. 7. A connector (1) with secondary latching comprising a handle (2) for filling slots (3a, 3b) into each of which a tongue (4a, 4b) with a latch (5a, 5b) is inserted, charac¬ terised in that the handle (2) engages a plug part (21) in a first position (I) in which the slots are not filled by two arms of the handle, and is mounted for movement transversely to the plug axis into a position (II) in which the arms can be pressed into the slots (3a, 3b) and engaged in a second position (II) . 8. A connector (1) according to claim 7, characterised in that the handle (2) has two arms (2a, 2b) for insertion into the slots and interconnected by a transverse strut (20) and bent at their ends parallel to the side walls of the plug part to form two wings (11a, lib) , and ending in second latches for engagement in the two positions. 9. A connector according to claim 7, characterised in that the opposite side walls of the plug part (21) have grooves (13a, 13b) for engaging the handle (2) and permitting side¬ ways movement of the handle (2) , and ribs (23) are disposed along a part of the grooves (13a, 13b) and run underneath and parallel to them and prevent the handle (2) from being pressed down in the said part . 10. A connector according to any of claims 7 to 9, characterised in that in the second latch position, the surface (20a) of the transverse strut (20) of the handle (2) is flush with the surface of the plug. 11. A connector according to claim 9 or 10, characterised in that cooperating knobs (25) and recesses (26) are so dis¬ posed on the insides of the transverse-strut wings and on the corresponding regions of the side walls that engagement corresponding to the first (I) and the second position (II) occurs in the respective lateral positions (I, II) of the handle (2) . 12. A connector according to any of claims 7 to 11, characterised in that the second latches (12a, 12b) are bevelled opposite the lower inner wall of the groove, so that the latches can come out of the grooves when pressure is exerted on the handle. 13. A connector (1) with secondary latching comprising a handle (2) for filling slots (3a, 3b) , a tongue (4a, 4b) with latches (5) being inserted into each slot, charac¬ terised in that the handle (2) has two locking arms which fill slots extending parallel to the axis (6) of the plug and are interconnected by a transverse strut (20) , and when the handle (2) is in the position in which the slots are not filled by the locking arms (2a, 2b) , the strut (20) projects backwards beyond the back of the connector, where it can be locked by a locking slide (30) which is movable transversely to the direction for plugging in and which extends under the transverse strut (20) . 14. A connector (1) according to claim 13, characterised in that the locking slide (30) is slidable in a groove (31) formed in the back wall of the connector (1) between a latchable release position which does not obstruct complete pressing of the handle into the slots and a latchable lock¬ ing position which prevents insertion of the handle (2) . 15. A connector according to claim 13 or 14, characterised in that the locking slide (30) has a grooving (34) on its surface . 16. A connector according to any of claims 13 to 15, characterised in that a pin (33) is disposed on the under¬ side of the strut (20) and its length is such that the lock¬ ing arms (2a, 2b) of the locking slide (30) do not penetrate into the slots (3a, ab) in the locking position of the locking slide (30) . 17. A connector with a lateral cable outlet and a plug part (1) comprising a plug attachment (2) and an adjoining casing which is flat transversely to the direction of insertion, characterised in that the cable outlet (40) comprises a two- part clamping device (50a, 50b) which firmly clamps the cable (56) at the outlet of the casing, wherein an upper hollow substantially semicylindrical groove (50a) with retaining ribs (47) is formed in an attachment (48) integral with a lid (45) on the casing and having two ver¬ tical side walls (5la, 51b) and a second hollow semicylindrical clamp (49) is secured to the casing and has retaining ribs (47) for latching at the in- sides of the side walls. 18. A connector according to claim 17, characterised in that the attachment (48) has an upper wall (60) with its inside formed with the upper groove (50a) and with two vertical side walls (51a, 51b) on the two longitudinal sides of the groove (50a) , latches (52) being formed in the side walls and cooperating with corresponding detents (53) on the clamp. 19. A connector according to claim 17 or 18, characterised in that the clamp (49) is shaped to match the contour of the inner side walls (51a, 51b) and the upper inner wall (60) of the attachment (48) , and the transitions between the upper wall (60) and the side walls (51a, 51b) are in the form of curves (54) , to generate a resilient pressing force on the cable . 20. A connector according to claim 19, characterised in that the side walls (49) of the clamp are resiliently pre- stressed outwards when formed. 21. A connector according to claim 19 or 20, characterised in that the side walls (51a, 51b) of the clamp are subse¬ quently moulded and have detents for securing the lid (40) to the body of the casing.

Inventors: ODOERFER FRANK, ODOERFER, FRANK
Applicants: FRAMATOME CONNECTORS INT, ODOERFER FRANK, FRAMATOME CONNECTORS INTERNATIONAL, ODOERFER, FRANK
Application year: 1997
Main classification: H01R13
IPC codes: H01R13