Electrical connector

Abstract: An electrical connector assembly (1,4) is provided which assumes a fully coupled state even if it was in a semi-coupled state prior to being attached to a support bracket (B). A lever 12 has an inclined coupling surface 26a which draws a semi-coupled female connector housing 4 in the coupling direction, thereby ensuring a fully coupled state. A support bracket (B) cannot be fully inserted until the lever 12 has moved the connectors (1,4) from a semi-coupled to a fully coupled condition. If the connectors are improperly connected a second inclined surface (26c) of the lever (12) decouples the connectors as the support bracket (B) is engaged.

Description: The present invention relates to an electrical connector equipped with a lever. As regards connectors which require a substantial mating force, for example when it is desired to mate male and female connectors with 20 contacts or more, connectors are known which have been provided with a lever in order to obtain the substantial mating force. In a conventional connector provided with a lever, the lever is provided with freedom to turn on the outer wall of a male housing provided with a hood. When the female housing is inserted inside the hood and the lever is turned, an engagement part provided on the lever engages with the female housing, thereby urging the female housing in the coupling direction, and bringing the male and the female connector housings into a fully coupled state. Such a conventional connector provided with a lever requires two operations, that of inserting the female connector housing into the hood to achieve the semi-coupled state, and that of operating the lever to draw the connectors together. It occasionally happens that the operator forgets to turn the lever when coupling the male and the female connector housings, and on such occasions the male and the female connector housings may remain in the semi-coupled state. Japanese Patent Kokai Hei 1-92781 discloses an invention in which such a semi-coupled state is detected in a connector provided with a lever. In this document, a turning piece, acting as a detector on the side which makes contact with an attachment surface when the connector is attached to an attachment bracket, is provided with freedom to turn on one of the connector housings. This turning piece is turned by the attachment surface to the position following the side surface of the other connector housing when the connector is in the fully coupled state, being attached in such a way as not to impede the attachment of the connector, and an engagement projection formed at its end engages with a lock piece provided on one of the connector housings, in such a way that the two connector housings are mated. The construction is such that, in the semi-coupled state, the turning piece comes into contact with the side surface of the other connector housing and is impeded from turning, and it is therefore not able to turn as far as the position following the side surface of the other connector housing described above. Thus, it is arranged in such a way that the connector can be attached to the attachment bracket only in the fully coupled state, and the semi-coupled state can be detected. However, in such a conventional connector in which the semi-coupled state is detected, the semi-coupled state is first discovered on attempting the operation of attaching the connector to the object to which it is to be attached, and the coupling operation has to be carried out again. Furthermore, because the configuration is such that the detector (turning piece) which detects the semi-coupled state makes the detection by coming into contact with the attachment surface of the object to which the connector is to be attached, the connector has only been able to be attached to a site having such an attachment surface. US-A-5226834 discloses a connector assembly according to the first part of claim 1 having a resilient latch between the male and female connectors and adapted to be mounted on a projection of an article, the projection engaging an aperture in one of the connectors. A pivotable lever retains the connectors together when in the closed condition. The projection is engageable in the aperture only when the pivotable lever is closed. The present invention has taken the above-mentioned problems into account, and comprises a connector provided with a lever, which can ensure a fully coupled state even if the connector is in the semi-coupled state when it is being attached to the object to which it is to be attached, and which can even be attached in sites which do not have an attachment surface as mentioned with regard to Japanese Patent Kokai Hei 1-92781. According to the invention there is provided a connector assembly for attachment to a support member provided on an object to which the connector assembly is to be fixed in use, the connector assembly comprising a male connector and a female connector each having a free end for mutual engagement along an assembly axis, one of said connectors having a lever pivoted thereon and the other of said connectors receiving said lever, said lever being pivotable in use from an open position to a closed position flush with the outer surface of said one connector to retain the male and female connector into a fully coupled state, said one connector including a support receiving member for engagement with said support member, said support receiving member including an attachment aperture adapted to receive said support member, and the pivot axis of said lever being perpendicular to said assembly axis, characterised in that said lever includes an attachment abutment for said support member, said attachment abutment being alignable and said attachment aperture being aligned in the direction of engagement with said support member, said attachment abutment being alignable and said attachment aperture being aligned with said assembly axis, the other of said connectors has a lever receiving aperture and a lever abutment, said lever being engageable in said aperture with said abutment, pivoting of the lever urging said male and female connector to the fully coupled state, and the support receiving member being adapted to ensure pivoting of said lever to said closed position by engagement with said support member. Preferably the male connector has a hood to receive the female connector, and said lever is pivoted on the hood. In such a construction, having coupled the female and male connector housings, the lever is turned to the position in which it is flush with the outer surface of the hood, a part of the lever which fits into the hood pushes the other connector housing in the coupling direction, thereby bringing the female and male terminal pieces into a fully coupled state. The support receiving member engages with the support member, and the connector assembly is thus attached to the substructure. Alternatively if an attempt is made to attach the connector to the support member in the semi-coupled state (without the lever lying in the flush position), then the support member engages with the upstanding lever which consequently pivots to the flush position. As a result, the lever pushes the other connector housing in the coupling direction, thereby bringing the connector housings into the fully coupled state. The invention has the advantage that, even if the operator omits to carry out the operation of pivoting the lever, this will be corrected and the connector will be put into the fully coupled state when it is attached to the support member; the connector assembly is therefore prevented from being attached to the support member in a semi-coupled state. In a preferred embodiment the lever is provided with an inclined coupling surface which makes contact with the lever abutment and thereby guides the other connector housing in the coupling direction. In use the lever pivots to the position in which it lies flush, and in doing so the inclined coupling surface engages the lever abutment so that the other connector housing is smoothly pushed in the coupling direction. Preferably the lever is provided also with an inclined disengagement surface which guides the other connector in the disengagement direction if the connectors are in less than the semi-coupled state. In this latter case the connector housings are in an even more improperly coupled state than the semi-coupled state, and the lever disengagement surface pushes the other connector housing in the disengagement direction to ensure that the connectors are fully disengaged. This has the advantage that, in addition to the correction of the semi-coupled state, the improperly coupled state is detected and the assembly assumes a condition which can clearly be visually checked, the connectors having been pushed apart. Other features of the invention will be apparent from the following description of a preferred embodiment shown by way of example only in the accompanying drawings, in which:- Figure 1 is an isometric view of a connector assembly according to the invention in the separated state. Figure 2 is a longitudinal cross section of the connector assembly in the semi-coupled state. Figure 3 is a longitudinal cross section in the semi-coupled state showing the pushing member. Figure 4 is the cross section of Figure 3 in the fully coupled state. Figure 5 is a side elevation in the fully coupled state. Figure 6 is a side elevation showing the connector assembly attached to an attachment bracket in the fully-coupled state. Figure 7 is a cross section illustrating connector assembly being attached to the attachment bracket in a semi-coupled state. Figure 8 is a cross section showing the connector assembly attached to the attachment bracket in the fully-coupled state. Figure 9 is a cross section illustrating connector assembly being attached to the attachment bracket in an improperly coupled state. Figure 10 is a cross section of the connector assembly attached to the attachment bracket in the improperly coupled state. As shown in Figure 1, the connector assembly is attached by insertion onto a tongue-shaped attachment bracket B provided projecting from the object onto which the connector is to be fixed. The connector itself comprises a female connector housing 4 and a male connector housing 1. Male terminal receiving chambers 10 housing male terminals 2 are provided in parallel to the left and to the right in the male connector housing 1. The male connector housing 1 is also provided on its coupling side with a hood 11 which couples with the female connector housing 4. A lever 12 is provided with freedom to pivot relative to the top surface of the male connector housing 1 and covering the top surface of the hood 11. A bracket attachment part 13, by means of which the male connector housing 1 engages with the attachment bracket B of the object to which the connector is to be attached, is also formed in the top surface of the male connector housing 1; a bracket stop 14 is formed in the top surface of the lever 12 as illustrated. As shown in Figures 2 and 3, a male terminal 2 with an electrical wire W attached at its rear is inserted in the male terminal receiving chamber 10, at the front end of which is formed a passage hole 16 from which a tab 2a at the front of the male terminal 2 projects into the hood 11. An upwardly directed flexible lance 17 is formed extending forwards from the bottom surface in the centre of the male terminal receiving chamber 10. A holding projection 17a is formed on the upper surface at the front of the lance 17, and engages a holding hole formed in the male terminal 2, thereby effecting a first hold on the male terminal 2. A retainer insertion hole 18, which receives a retainer 19 is formed in the side surface of the male connector housing 1 running through to the terminal receiving chamber 10. The retainer 19 has a raised track 19a projecting from the top surface thereof and which engages with a stabiliser 2b provided in the bottom surface of the male terminal 2, thereby effecting a second hold on the male terminal 2. A step D is provided to the rear of the hood 11, being such that the rear end of a lever 12 discussed hereinbelow is able to freely pivot on the male connector, and an in-fitting hole 25 through which a pushing piece 26 discussed hereinbelow enters and exits is provided extending in the front-to-back direction in the top surface of the hood 11. Furthermore, notches 20, through which pass engagement projections 41 provided on the side surfaces of the female connector housing 4 discussed hereinbelow, are formed on the outer surface of the hood 11 (see Figure 1). The lever 12 is pivotable on the hood 11 between parting and touching conditions described below in greater detail. The lever 12 is generally in the shape of an inverted 'U' so as to cover the top surface of the hood 11, and comprises side surfaces 12b on either side of the top surface 12a. Additionally, holes 21, which couple with and are supported by spindles 22 projecting on the side surfaces of the male connector housing 1, are provided to the rear of the two side surfaces 12b, and these spindle holes 21 define a pivot axis and permit the lever 12 to turn from a position along the top surface of the hood 11, as shown in Figure 4, to a separated position, as shown in Figure 3. Furthermore, engagement holes 23, which engage with the engagement projections 41 provided on the sides of the female connector housing 4 discussed hereinbelow, are provided to the front of the side surfaces 12b. Additionally, as shown in Figure 5, the arrangement is such that when the engagement holes 23 are engaged with the engagement projections 41, the top surface 12a of the lever 12 is held in the position along the top surface 11a of the hood 11. As shown in Figure 3, a pushing piece 26, which fits into the in-fitting hole 25 of the hood 11 mentioned above, is formed projecting in the centre of the underside of the upper surface 12a of the lever 12. The bottom surface of this pushing piece 26 is formed in the shape of a mound having an inclined coupling surface 26b and an inclined disengagement surface 26c. The inclined coupling surface 26b is provided inclined to the rear from the apex 26a of the pushing piece 26, and the inclined disengagement surface 26c is provided inclined to the front from the apex 26a. As shown in Figure 3, to form the bracket attachment part 13, there is a sleeve-like bracket passage hole 15, extending upwards from the top surface to the rear of the male connector housing 1 and through which the attachment bracket B passes from the rear. Additionally a holding projection 27 which engages with the attachment hole B1 provided in the attachment bracket B is provided on the inside of this bracket passage hole 15. Furthermore, a bracket stopper 14 is formed projecting in the centre of the top surface of the lever 12. As shown in Figure 4, in the bracket stopper 14, the periphery of the upright stopper wall 14a is surrounded by a top wall 14b and left and right side walls 14c, and a guiding surface 14d is formed on the inside of the top wall 14b. Additionally, the arrangement is such that the front of the attachment bracket B passes inside the bracket passage hole 15, follows the top surface 12a of the lever 12, and comes into contact with the stopper wall 14a. Thus, the connector is arranged in such a way that it is attached by engaging with the attachment bracket B in two locations, namely the bracket attachment part 13 and the top wall 14b. Meanwhile, as shown in Figure 1, the female connector housing 4 is formed in an approximately rectangular form such that its front can fit into the hood 11, and engagement projections 41 for engagement with the above-mentioned engagement holes 23 are formed projecting on both side surfaces. Furthermore, female terminal receiving chambers 40, which couple with female terminals 5, are provided in parallel to the left and to the right inside the female connector housing 4. An upwardly directed flexible lance 43 is formed inside the female terminal receiving chamber 40 extending forwards from the top surface, and this is provided with a holding projection 43a which effects a first hold by engaging with a holding hole on the top surface of the respective female terminal 5. A retainer insertion hole 44 receiving a retainer 45 effecting a second hold on the female terminal 5 is provided on a side surface of the female connector housing 4 running through to this female terminal receiving chamber 40. The retainer 45 has a raised track 45a projecting from the top surface thereof, and which engages with a recessed part 5b provided in the bottom surface of the female terminal 5, thereby effecting a second hold on the female terminal 2. As shown in Figures 1 and 3, an in-fitting channel 47 is provided in the top surface of the female connector housing 4, cut away across the central region from the front, arranged in such a way that the above-mentioned pushing piece 26 can be fitted therein. A contact piece 46 lying across the in-fitting channel 47 is integrally formed at the front of the in-fitting channel 47. If the lever member 12 is pushed down when the female connector housing 4 has been semi-coupled in the hood 11 as shown in Figure 3, then the inclined coupling surface 26b of the pushing member 26 comes into contact with the contact piece 46 thereby advancing the female connector housing 4 in the coupling direction. The action of this embodiment is now explained. The action will be described for cases in which the connector is attached to its attachment bracket B in the fully coupled state, the semi-coupled state, and in an improperly coupled state. The female connector housing 4 is inserted into the hood 11 of the male connector housing 1 to produce the semi-coupled state shown in Figure 2, in which the front of the tab 2a of the male terminal 2 touches the male terminal 5. If the lever 12 is turned in this state, then, as shown in Figure 3, the pushing piece 26 progresses into the in-fitting hole 25 and the in-fitting channel 47 formed in the hood 11 and the female connector housing 4 respectively, thereby coming into contact with the contact piece 46. At this time, the inclined coupling surface 26b of the pushing piece 26 comes into contact with the contact piece 46. Consequently if the lever 12 is turned further so that it is turned to the position in which it lies along the outside surface of the hood 11, then the inclined coupling surface 26b pushes the contact piece 46 and the female connector housing 4 is urged in the coupling direction to produce the fully coupled state shown in Figure 4. In this way, the male and the female terminals 2 and 5 are fully coupled together. Furthermore, the engagement holes 23 provided on both side surfaces of the lever 12 engage with the engagement projections 41 provided on the side surfaces of the female connector housing 4 and the lever 12 is locked. Having produced the fully coupled state in this way, if the attachment bracket B is inserted into the bracket passage hole 15, then, as shown in Figure 8, the end of the attachment bracket B follows over the top surface 12a and it is inserted until its front surface comes into contact with the stopper wall 14a, and at the same time the holding projection 27 is engaged by the attachment hole B1 of the attachment bracket B whereby the connector is fixed against movement. If an attempt is made to attach the connector to the attachment bracket B in the semi-coupled state without having turned the lever 12, then, as shown in Figure 7, the front of the attachment bracket B passes through the inside of the bracket insertion hole 15, and it then comes into contact with the top surface 12a of the lever 12 which is inclined. The inclined top surface 12a is pushed down by the attachment bracket B, and the lever member 12 pivots to lie along the outer surface of the hood 11. The front of the attachment bracket B is inserted up to the point at which it comes into contact with the stopper wall 14a, the engagement projection 27 engages with the attachment hole B1 of the attachment bracket B whereby the connector is fixed, and the fully coupled state shown in Figure 8 is produced. Thus, even if an operator forgets to turn the lever 12, the connector is put into the fully coupled state when it is attached to the attachment bracket B and there are no instances in which it can be attached to the attachment bracket B in the semi-coupled state. If, as shown in Figure 9, an attempt is made to attach the connector to the attachment bracket B in the improperly coupled state in which the female connector housing 4 is only slightly inserted into the hood 11, then the front of the attachment bracket B pushes down the top surface 12a of the inclined lever 12, and the lever 12 is turned to the position in which it lies along the outer surface of the hood 11. However, in the improperly coupled state, the inclined disengagement surface 26c of the pushing piece 26 comes into contact with the contact piece 46. Consequently, as the lever 12 is turned, the inclined disengagement surface 26c pushes the contact piece 46, thereby producing the disengaged state shown in Figure 10 in which the female connector housing 4 is pushed out in the disengaging direction. Because the fact that the female connector housing 4 has been pushed out of the hood 11 can be satisfactorily checked visually, the operator can easily discern that the connector is not in the fully coupled state and can repeat the assembly operation. Thus, with the connector of this embodiment, even if the connector is attached to the attachment bracket B having omitted to put it in the fully coupled state, it will be corrected and put into the fully coupled state if it was in the semi-coupled state, or the female connector housing 4 will be pushed out from the male connector housing 1 if it was in an improperly coupled state, and the connector is therefore prevented from being attached to the attachment bracket B in a semi-coupled state or an improperly coupled state. Furthermore, because the attachment bracket B need only be inserted until the stopper wall 14a comes into contact with the front of the attachment bracket B when the connector is attached to the attachment bracket B, attachment of the connector onto the attachment bracket B can be easily performed.

Claims: A connector assembly for attachment to a support member (B) provided on an object to which the connector assembly is to be fixed in use, the connector assembly comprising a male connector (1) and a female connector (4) each having a free end for mutual engagement along an assembly axis, one of said connectors (1) having a lever (12) pivoted thereon and the other of said connectors (4) receiving said lever, said lever (12) being pivotable in use from an open position to a closed position flush with the outer surface of said one connector (1) to retain the male and female connector (1, 4), into a fully coupled state, said one connector (1) including a support receiving member (13) for engagement with said support member (B), said support receiving member (13) including an attachment aperture (15) adapted to receive said support member, and the pivot axis of said lever (12) being perpendicular to said assembly axis, characterised in that said lever (12) includes an attachment abutment (14) for said support member (B), said attachment abutment (14) being alignable and said attachment aperture (15) being aligned in the direction of engagement with said support member (B), said attachment abutment (14) being alignable and said attachment aperture (15) being aligned with said assembly axis, the other of said connectors (4) has a lever receiving aperture (47) and a lever abutment (46), said lever (12) being engageable in said aperture (47) with said abutment (46), pivoting of the lever (12) urging said male and female connector to the fully coupled state, and the support receiving member (13) being adapted to ensure pivoting of said lever (12) to said closed position by engagement with said support member (B). A connector assembly according to Claim 1 wherein a free end of said lever (12) is closer to the free end of said one connector (1) than said pivot axis. A connector assembly according to Claim 2 wherein said lever abutment (46) is adjacent the free end of said other connector (4). A connector assembly according to any preceding Claim wherein said lever (12) comprises a projection (26) having a first surface,facing (26a) away from the free end of said one connector (1), said first surface (26a) being for engagement with a first engagement surface of said lever abutment (46) which faces away from the free end of said other connector (4). A connector assembly according to Claim 4 wherein said lever includes a second surface (26c) opposite said first surface (26a) and said lever abutment (46) includes a second engagement surface opposite said first engagement surface, said second surface (26c) being engageable with said second engagement surface, said first and second surfaces (26a,26c) meeting at an apex of said projection, and said first and second engagement surfaces meeting at an apex facing said lever (12). A connector assembly according to Claim 4 or Claim 5 wherein said projection (26) is plate like and extends perpendicular to said pivot axis and to said assembly axis. A connector assembly according to Claim 6 wherein said lever receiving aperture (47) is a slot. A connector assembly according to any preceding claim wherein said male connector (1) is provided with a hood (11) to receive the female connector (4), said lever (12) being pivoted on said hood (11). A connector assembly according to any preceding claim wherein said lever (12) includes latching means (23) for engagement with said male connector (1) when in the flush condition. A connector assembly according to any preceding claim and a support member (B), said support member being adapted for attachment to an object to which the connector assembly is to be fixed in use. A connector assembly according to claim 10 wherein said support member (B) and connector assembly (1,4) include respective male and female latch members (B1,27) adapted to be latched on full engagement of said support member (B) and assembly (1,4).

Inventors: KONOYA HISASHI, NANKOH YOUICHI, TANIUCHI OSAMU, KONOYA, HISASHI, NANKOH, YOUICHI, TANIUCHI, OSAMU, KONOYA, HISASHI, C/O SUMITOMO WIRING SYSTEMS, LTD., NANKOH, YOUICHI, C/O SUMITOMO WIRING SYSTEMS, LTD., TANIUCHI, OSAMU, C/O SUMITOMO WIRING SYSTEMS, LTD.
Applicants: SUMITOMO WIRING SYSTEMS, SUMITOMO WIRING SYSTEMS, LTD.
Application year: 1995
Main classification: H01R13
IPC codes: H01R13