ELECTRIC CONNECTOR
The present invention relates to an electric connector, in particular an automotive electric connector of the type comprising an insulating casing defining a number of cavities for housing respective electric terminals, and connectable along a longitudinal axis to a complementary connecting member, e.g. another electric connector, to define an electric connecting assembly. Electric connectors of the above type are known which also comprise a retaining lever, which projects from ar_ outer wall of the casing in a direction substantially parallel to said longitudinal axis, and clicks releasably onto a tooth on the complementary connecting member to define a fully-assembled configuration of the electric connecting assembly.
More specifically, the retaining lever is defined by two longitudinal arms extending parallel to the longitudinal axis along which the connector is connected to the complementary connecting member, and having first ends integral with the casing, and opposite second ends joined by a cross member for engaging the tooth on the complementary connecting member.
The retaining lever is secured to the casing to flex, in a direction perpendicular to the wall from which it originates, so that the cross member of the retaining lever clicks onto the tooth on the complementary connecting member; and, similarly, to release the
connector from the complementary connecting member, the user must act on the cross member on the end of the retaining lever to move the retaining lever away from the casing wall from which it originates and so release the tooth on the complementary connecting member.
In the fully-assembled configuration of the connecting assembly, there is usually very little space between the retaining lever and the adjacent outer wall of the complementary connecting member, thus making it awkward for the user to grip and exert pull on the cross member on the end of the retaining lever to release the cross member from the tooth on the complementary connecting member.
It is an object of the present invention to provide an electric connector designed to eliminate the aforementioned drawback typically associated with known connectors.
According to the present invention, therfe is provided an electric connector as claimed in Claim 1. Two preferred, non-limiting embodiments of the present invention will be described by way oE example with reference to the accompanying drawings, in which:
Figure 1 shows a view in perspective of an electric connector in accordance with the present invention being connected to a complementary electric connector;
Figure 2 shows a larger-scale side view of a detail in Figure 1;
Figure 3 shows a view in perspective of a further
embodiment of an electric connector in accordance with the present invention being connected to a complementary electric connector;
Figure 4 shows a larger-scale side view of a detail in Figure 3.
Number 1 in Figures 1 and 2 indicates as a whole an electric connector in accordance with the teachings of the present invention, and which mates with a complementary connecting member 2 - in the example shown, an electric connector - along a longitudinal axis A to form an electric connecting assembly 3.
Connector 1 and complementary connecting member 2 are described below only insofar as necessary for a clear understanding of the present invention. More specifically, complementary connecting member 2 does not form part of the present invention, and is described and illustrated purely for the purpose of demonstrating the functions performed by the various component parts of connector 1. Complementary connecting member 2 substantially comprises an insulating casing 4 defining, internally, one or more through cavities - two in the example shown - for housing respective known electric terminals (not shown) , and having, externally, a retaining tooth 6 which, as explained in detail below, engages a corresponding part of connector 1 to define a fully- assembled configuration of electric connecting assembly
More specifically, tooth 6 is bounded by two sides 7 and 8, which, are respectively substantially perpendicular and oblique with respect to axis A, and are respectively located to the rear and front in the mating direction with connector 1.
With reference to the accompanying drawings, connector 1, which is the object of the present invention, substantially comprises an insulating casing 9 designed to mate with casing 4 of complementary connecting member 2, and defining one or more through cavities (not shown, but obviously two in number in the example shown) having respective longitudinal axes parallel to axis A, and for housing respective known electric terminals (not shown) which engage the terminals of complementary connecting member 2 when casings 4 and 9 are connected.
More specifically, casing 9 comprises, integrally, a prismatic body for housing the electric terminals and defined by two flat, parallel base walls 10, 11 connected to each other by two curved walls 12 symmetrical with respect to axis A.
Connector 1 also comprises a retaining lever 18 projecting from wall 10 of casing 9, and which clicks releasably onto tooth 6 of complementary connecting member 2 to define the fully-assembled configuration of electric connecting assembly 3.
Moχ-e specifically, retaining lever 18 comprises an engaging or retaining portion 19 for engaging tooth 6,
and which is defined by two longitudinal arms 20 extending parallel to axis A from first ends 23 integral with wall 10, and joined to each other at opposite second ends by a cross member 21 for engaging tooth 6. Arms 20 and cross member 21 define a prismatic seat 28 for housing tooth 6 in the fully-assembled configuration of electric connecting assembly 3.
Arms 20 being connected integrally to casing 9, retaining lever 18 flexes about an axis B perpendicular to axis A, parallel to wall 10, and defined at ends 23 of arms 20.
According to an important aspect of the present invention, retaining lever 18 also comprises, integrally, a disengaging or release portion 30 defining an actuating projection 37, which is located on the opposite side of flex axis B to cross member 21 for engaging tooth S of complementary connecting member 2, and which is pressed to release retaining lever 18 from tooth 6.
More specifically, release portion 30 projects from cross member 21 in a direction parallel to axis A, is bent over the opposite side of retaining lever 18 with respect to wall 10 of casing 9, and has a free end defined by projection 37.
In other words, viewed from the side, the retaining lever is substantially C-shaped.
More specifically, projection 37 extends perpendicularly to the plane of release portion 30, on the opposite side to wall 10, and terminates with a
press -operated surface 38 .
Release portion 30 also comprises two lateral tabs
33 symmetrical with respect to axis A and secured integrally to wall 10 of casing 9 to define a rigid rotation axis C, parallel to flex axis B , of retaining lever 18 .
More specifically, each tab 33 proj ects from a respective lateral edge of release portion 30 , extends perpendicularly to and towards wall 10 , and terminates with a tapered lip 36 connected to wall 10 and defining axis C .
As shown in Figures 1 and 2, axis C is interposed between flex axis B and cross member 21 for engaging tooth 6 of complementary connecting member 2, so that, when projection 37 is pressed, retaining lever 18 røtates about axis C, thus flexing retaining portion 19 about axis B.
On the opposite side to that facing casing 9, release portion 30 also comprises a trapezoidal-section rib 40 for strengthening retaining lever 18. In an alternative embodiment not shown, rib 40 may be formed on the opposite side of release portion 30, i.e. on the side facing casing 9.
Electric connecting assembly 3 is assembled by bringing connector 1 and complementary connecting member 2 together along axis A, so that oblique side 8 of tooth 6 contacts cross member 21 of retaining lever 18.
Side 8 is designed to initially flex retaining lever
18 about axis B to lift cross member 21 away from wall 10 of casing 9. In other words, side 8 of tooth 6 defines a sort of ramp along which cross member 21 of retaining lever 18 slides. As connector 1 and complementary connecting member 2 are moved towards each other and side 7 of tooth 6 passes beneath cross member 21, retaining lever 18 drops back down into the initial undeformed configuration, so that tooth 6 is retained by cross member 21 inside seat 28. Electric connecting assembly 3 is released by exerting pressure on surface 38 of projection 37 of release portion 30, i.e. towards wall 10 of casing 9.
By means of tabs 33, the above pressure produces an anticlockwise rotation of retaining lever 18 about axis C, and which comprises a substantially rigid movement of release portion 30, and flexing of cross member 21 about axis B.
Consequently, cross member 21 of retaining lever 18 withdraws from wall 10 of casing 9, leaving tooth 6 free to move parallel to axis A.
When connector 1 is withdrawn from complementary connecting member 2, tooth 6 withdraws from seat 28 to release electric connecting assembly 3.
Number 1 ' in Figures 3 and 4 indicates as a whole an electric connector in accordance with an alternative embodiment of the present invention. Connector 1' is similar to connector 1, is described below only insofar as it differs from connector 1, and any corresponding or
equivalent parts of connectors 1 and I1 are indicated, where possible, using the same reference numbers.
More specifically, in this case, retaining lever 18 comprises two lateral tabs 33 ' similar to tabs 33 but differing by being formed separately from wall 10 of casing S.
More specifically, each tab 33 ' terminates towards casing 9 with a rounded, tapered end 36' which, when disconnecting connector 1 ' from complementary connecting member 2, rests inside a relative recess 42' formed on the outside of wall 10 of casing 9 to define the rigid axis of rotation C of retaining lever 18.
Moie specifically, as shown in Figures 3 and 4, ends 36' of tabs 33' and recesses 42' of casing 9 are complementary in shape.
Connector 1 ' preferably also comprises a frame member 45' projecting from casing 9 and through which release portion 30 extends.
Frame member 45 ' acts as a further restraint for retaining lever 18, in the event of lateral movement of release portion 30, within its own plane, caused by accidental impact when transporting and handling connector 1 ' .
Connection of connector 1 ' to complementary connecting member 2 is the same as described above for connector 1, and therefore needs no further explanation.
Disconnection of connector 1 ' from complementary connecting member 2 only differs from that of connector 1
by the pressure exerted on surface 38 of projection 37 first causing ends 36' to rest on respective recesses
42 ' , and then rigidly rotating retaining lever 18 about axis C, thus flexing the retaining portion about axis B. The advantages of connectors 1, I1 according t:o the present invention will be clear from the foregoing description.
In particular, projection 37 of retaining lever 18 is easily accessible from the outside, thus enabling the user to easily exert the necessary pressure on surface 38 to release tooth 6 of complementary connecting member 2 from seat 28 of connector 1.
Moreover, since end 36' of tab 33' is free to rotate inside recess 42 ' , with no resistance to rotation, therefore, in the hinge area, less pressure is required on surface 38 of connector 1' than on that of connector 1 to release assembly 3.
Clearly, changes may be made to connectors 1, I1 as described and illustrated herein without, however, departing from the protective scope as defined in the accompanying Claims.