Electrical connector employing dual locking contact retention

An electrical connector assembly securely locks electrical contacts within a connector housing. The connector assembly includes a plurality of electrical contacts each having first and second longitudinally spaced locking elements. A connector housing includes an interconnection end and a contact insertion end. The connector housing also includes an initial contact support member positioned adjacent the insertion end of the housing. The initial contact support member includes a plurality of apertures permitting insertable passage of the contacts therethrough. Engagement elements on the initial contact support member engage the first locking element of the contacts preventing inadvertent withdrawal of the contacts from the housing. A final contact support member is movably positioned adjacent the interconnection end of the housing. The final contact support member includes contact passage apertures therethrough. Each contact passage aperture has a first aperture portion which permits insertion of the contacts therethrough and a second aperture portion which restricts withdrawal of the contacts therethrough. The final contact support member is movable within the housing to move from a first position permitting contact passage through the apertures to a second position preventing contact passage through the apertures.

FIELD OF THE INVENTION 
The present invention relates generally to an electrical connector used to 
terminate plural electrical conductors. More particularly, the present 
invention relates to an electrical connector which insertably supports a 
plurality of terminated electrical contacts in a connector housing and 
which locks the inserted contacts in the housing preventing inadvertent 
withdrawal. 
BACKGROUND OF THE INVENTION 
Electrical connectors which insertably accommodate plural terminated 
electrical contacts have long been known. Connectors such as these are 
used to interconnect electrical conductors which may carry electrical 
signals or electrical power. In certain applications, such as in computer 
or automotive use, it has become common to miniaturize the connectors, 
that is provide smaller connector components, while still maintaining the 
ability to terminate numerous conductors. 
As the interconnection scheme for plural conductors may differ in each 
application, it is quite common for a connector manufacturer to supply 
discrete connector assembly components, such as an insulative housing and 
plural electrical contacts, to an end user. The end user would terminate 
the individual conductors to the contacts and then insert the contacts 
into the connector housing in a specified pattern dictated by the 
particular customer application. 
As the end user must reliably and quickly construct numerous connector 
assemblies, the components supplied by the connector manufacturer must be 
easy to assemble in a reliable fashion. Also, in use, these connectors may 
be subjected to repeated connections and disconnections (mating cycles). 
The electrical contacts which terminate the electrical conductors must 
therefore be securely retained within the connector housing so as to 
withstand such repeated mating cycles. While in order to facilitate ease 
of assembly, the contacts must be easily inserted into the connector 
housing; the contacts must also be able to withstand repeated connections 
and disconnections. 
Also, during assembly and at a time thereafter, there may be a need to 
replace or reposition a contact inserted into a connector housing. Such 
repositioning may be dictated by a change in a wiring pattern or to 
correct a mistakenly positioned contact. Thus while it is desirable to 
securely lock the contact in the connector housing during use, it cannot 
be permanently fixed therein. Thus, the contacts must also be removable in 
certain instances to provide for replacement or repositioning. 
The art has seen various constructions of connector housings and electrical 
contacts which permit insertable retention of the contacts in the housing. 
Common among these examples are electrical contacts being formed with 
spring biased fingers or flanges which may be compressed upon insertion 
into an opening in the housing and then spring back engaging a portion of 
the housing preventing withdrawal thereof. Such examples are shown in U.S. 
Pat. Nos. 4,557,543 and 5,295,871. These patents also disclose the use of 
an appropriate tool which can effect withdrawal of the contact from the 
housing for replacement or repositioning. 
While the connectors shown in the above-identified patents adequately 
support and lock the contacts in the connector housing when properly 
assembled, there exists the possibility that the contacts may be 
incorrectly inserted into the housing in a manner where full contact 
locking does not take place. An end user would be unaware of this improper 
insertion. Thus, upon interconnection during use, a contact may dislodge 
from the housing rendering the electrical connection ineffective. 
It is therefore desirable to provide an electrical connector which 
incorporates redundant locking mechanisms to assure proper locking of the 
contact in the connecting housing. Also, such a connector would prevent 
interconnection with a mating connector unless the contacts are properly 
locked in the connector housing. 
SUMMARY OF THE INVENTION 
It is an object of the present invention to provide an electrical connector 
which insertably accommodates contacts terminating electrical conductors. 
It is a further object of the present invention to provide an electrical 
connector including a connector housing which securely retains terminated 
electrical contacts which are inserted thereinto. 
It is a still further object of the present invention to provide an 
electrical connector housing which accommodates, in locking fashion, 
terminated contacts inserted thereinto and prevents the inadvertent 
withdrawal thereof. 
It is yet another object of the present invention to provide an electrical 
connector housing having dual locking elements which simultaneously engage 
electrical contacts to securely lock the contacts therein. 
In the efficient attainment of these and other objects, the present 
invention provides an electrical connector assembly. The assembly includes 
an insulative connector housing. The connector housing has a contact 
supporting first surface and a contact supporting second surface which is 
spaced from the first surface. The contact supporting first surface 
includes first apertures therethrough and the contact supporting second 
surface includes second apertures therethrough which are aligned with the 
first apertures. Elongate electrical contacts are supported by the 
housing. Each contact is insertable into the housing and includes first 
and second locking elements which are spaced apart and insertable through 
the first and second apertures of the respective first and second contact 
supporting surfaces. Each of the first and second contact supporting 
surfaces include locking means cooperatively engageable with the first and 
second locking elements of the contacts for independently providing 
locking engagement between the first and second housing surfaces and the 
first and second locking elements. 
As more particularly described by way of the preferred embodiment herein, a 
plurality of elongate electrical contacts are provided. Each contact has a 
connection end, an opposed conductor terminating end and a central portion 
therebetween. The central portion includes first and second longitudinally 
spaced locking elements. An elongate connector housing includes an 
interconnection end and a contact insertion end for insertably receiving 
the contacts. The connector housing includes an initial contact support 
member positioned adjacent the insertion end which includes a plurality of 
initial apertures permitting insertable passage of the contacts through 
the initial contact support member in an insertion direction. The initial 
contact support member includes engagement elements adjacent each initial 
aperture for locking engagement with first locking element of the contacts 
preventing inadvertent movement of the contacts in a withdrawal direction. 
The housing further includes a final contact support member movably 
positioned in the housing adjacent the interconnection end thereof. The 
final contact support member includes a plurality of final apertures each 
shaped to include a first aperture portion designed to permit passage of 
the second locking member of the contact therethrough and a second 
aperture portion in communication with the first, dimensioned to prevent 
passage of the second locking element therethrough. The final contact 
support member is movably supported within the housing to move from a 
first position permitting contact passage through the final aperture to a 
second position preventing contact passage through the final aperture.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
Referring to FIG. 1, an electrical connector assembly 10 of the present 
invention is shown. Connector assembly 10 includes an elongate insulative 
connector housing 12 shown aligned along axis l in exploded view in FIG. 
1. Connector housing 12 includes a base 14, a cover 16, an initial contact 
support member 18 and a final contact support member 20. Contact support 
members 18 and 20 are supported between base 14 and cover 16. Each of the 
components of housing 12 are formed of a suitably insulated plastic 
material. In the present illustrative embodiment base 14, cover 16 and 
initial contact support member 18 are formed of a PPO/nylon blend such as 
the type sold under the General Electric trademark NORYL.RTM.. Final 
contact support member 20 may be preferably formed of a PPA thermoplastic. 
Referring to FIGS. 2 and 3, an electrical contact 22, which may be 
accommodated in housing 12, is shown. Contact 22 is an elongate suitably 
conductive member preferably formed of beryllium copper. Contact 22 has a 
connection end 24, a conductor terminating end 26 and a central portion 28 
lying therebetween. In the present embodiment shown in FIGS. 2 and 3, 
connection end 24 is formed into a conventional socket or barrel which 
would accommodate a pin-type electrical contact therein. However, as is 
well known in the connector art, other shapes of connection end 24 may 
also be employed. Connector terminating end 26 includes a conductor 
receiving nest 26a which accommodates the stripped end of an electrical 
conductor (not shown) therein. In conventional fashion, conductor 
terminating end 26 may be crimped around the bared extent of the 
electrical conductor to establish electrical connection therebetween. As 
is well known in the electrical connection art, suitable crimping tools 
(not shown) may be used to effect termination of an electrical conductor 
to contact 22. 
The central portion 28 of contact 22 includes a pair of longitudinally 
spaced contact shoulders 30 and 32 spaced by a narrow intermediate extent 
34. Contact shoulders 30 and 32 form raised or enlarged portions of 
contact 22 and as will be described in further detail hereinbelow, 
cooperate with support members 18 and 20 to secure contact 22 within 
housing 12. 
Referring again to FIG. 1, base 14 of connector assembly 10 includes a 
forward interconnection end 36 which is configured to insertably mate with 
a mating electrical connector (not shown) to establish electrical 
connection between contacts 22 supported within housing 12 and 
complementary contacts supported within the mating connector. 
Interconnection end 36 includes a plurality of openings 38 therethrough, 
which permit interconnection access to the connection end 24 of contacts 
22. Base 14 includes a contact receiving end 40 adjacent the open end of 
base 14 which is longitudinally opposed to interconnection end 36. The 
open end of base 14 is closed by cover 16 which is snap fitted thereover. 
Cover 16 includes a plurality of openings 42 therethrough which are 
aligned with openings 38 of base 14 to permit insertion of contacts 22 
thereinto when cover 16 is snapped onto base 14. Cover 16 includes a pair 
of upper and lower cover latches 44 which are insertable into recesses 46 
in base 14. Latches 44 and recesses 46 are used in combination to 
mechanically secure housing 12 to a mating electrical connector. The 
interengagement of latches 44 in recesses 46 is more clearly shown in FIG. 
4. Appropriate cooperating latching structure would be provided on the 
mating connector (not shown) to enable latching interconnection therewith. 
Contact support members 18 and 20 are positioned between base 14 and cover 
16. 
Referring additionally to FIG. 6, initial contact support member 18, which 
is positioned adjacent cover 16, is shown. Initial contact support member 
18 is a generally rectangular member including a perimetrical rim 48 and a 
pair of outwardly extending walls 50 and 52 which extend along opposed 
longitudinal sides of rim 48. A pair of outwardly extending positioning 
posts 54 and 56 extend from opposed transverse sides of rim 48 and help to 
properly position initial contact support member 18 within housing 12. 
Initial contact support member 18 includes a plurality of generally 
circular apertures 58 therethrough. Apertures 58 are arranged in a pattern 
generally identical to the pattern of openings 38 and 42 of base 14 and 
cover 16 respectively. 
About each aperture 58, initial contact support member is constructed to 
include a pair of diametrically opposed outwardly extending generally 
frustoconical fingers 60, a pair of such fingers about each aperture 58 
being defined as fingers 60a and 60b. As fingers 60 are integrally formed 
with plastic initial contact support member 18, fingers 60 are somewhat 
resilient, that is, they can be partially deflected and will return to 
their original position. In this regard fingers 60 serve to secure contact 
22 therebetween. Opposed fingers 60a and 60b form a generally 
frustoconically shaped extension about each aperture 58. The diameter of 
the frustum of the cone at the narrow end is constructed to be less than 
the diameter of contact shoulder 30 of contact 22 as shown in FIG. 3. A 
forward portion 30a of contact shoulder 30 is tapered forming a lead-in 
surface. Upon insertion of contact 22 through aperture 58, fingers 60a and 
60b expand over forward tapered portion 30a and snap back behind shoulder 
30 to engage an abutment surface 30b to secure contact 22 therein. This 
will be described in further detail hereinbelow. 
Referring additionally to FIG. 7, final contact support member 20 is shown. 
Contact support member 20 is generally a rectangular planar member having 
a pattern of apertures 62 therethrough. Apertures 62 are generally 
positioned to correspond to the position of apertures 58 in initial 
contact support member 18. Final contact support member 20 includes a 
perimetrical structure in the form of indentations 21 thereabout which 
helps to movably position final contact support member 20 within housing 
12 as will be described in further detail hereinbelow. 
Apertures 62 have a generally "key-hole" shape including a first larger 
circular aperture portion 64 and a smaller laterally extending second 
aperture portion 66 in communication therewith. First aperture portion 64 
is dimensioned so as to permit passage therethrough of contact shoulder 32 
of contact 22. First aperture portion 64 is slightly larger than contact 
shoulder 32 permitting such passage therethrough. Second aperture portion 
66 of aperture 62 is dimensioned to be smaller than shoulder 32 of contact 
22 so as to restrict its passage through second aperture portion 66. Final 
contact member 20 is movably positioned within housing 12 so as to be 
laterally movable from a first position where first aperture portion 66 is 
in alignment with aperture 58 of initial contact support member 18 and 
openings 38 and 42 of base 16 and cover 16 respectively. In this position 
contacts 22 may be insertably positioned from the rear of cover 16 into 
base 14 through support members 18 and 20. Once contacts 22 are properly 
positioned within housing 12, final contact support member 20 may be 
laterally moved so that second aperture portion 66 is in alignment with 
contact shoulder 32. An abutment surface 32b of shoulder 32 bears against 
the wall peripherally about second aperture portion 66 preventing 
withdrawal of the contact 22 therefrom. 
Having described the components of the present invention, its assembly may 
now be described. 
Housing 12, shown in FIG. 1, may be assembled by first inserting final 
contact support member 20 within base 14 through the open end 40 thereof. 
Arm 23 extending from final contact support member 20 provides for proper 
orientation. Initial contact support member 18 is inserted therebehind 
with posts 54 and 56 properly positioning both support members 18 and 20 
within the cavity of base 14. Final contact support member 20 is laterally 
movable within base 14, it being manually actuatable by extending portions 
20a which extend exteriorly of base 14 as will be described in further 
detail hereinbelow. Cover 16 is then snap fitted over the open end 40a of 
base 14 securing both initial contact support member 18 and final contact 
support member 20 within housing 12. Conventional snap fitting structures 
on both cover 16 and base 14 provide for such securement. While not shown 
in FIG. 1, but shown in FIGS. 4 and 5, a resilient apertured gasket 70 may 
be interposed between cover 16 and initial contact support member 18 to 
provide a seal about contacts 22 inserted therethrough. 
With housing 12 so assembled, insertion of contacts 22 thereinto may take 
place. A user would terminate an individual insulated electrical conductor 
(not shown) to contact 21 by placing a stripped end extent thereof into 
nest 26a of conductor terminating end 26. An appropriate crimping tool 
would be used to crimp the stripped end of the conductor therein. Thus, 
conductors would be electrically terminated to the individual contacts 22. 
As may be dictated by a particular wiring pattern, an installer would 
individually insert terminated contacts 22 into housing 12 through 
openings 42 in cover 16. Connection end 24 would be inserted through 
opening 42. Upon insertion, the barrel forming connection end 24 will pass 
between opposed fingers 60a and 60b of initial contact support member 18. 
This will cause fingers 60a and 60b to resiliently deflect permitting 
continued passage of contact 22 therethrough. The fingers will ride over 
shoulder 32 and snap back into intermediate extent 34. Continued contact 
insertion causes fingers 60a and 60b to again deflect and ride over 
shoulder 30 until they snap back behind shoulder 30 thereby securely 
locking contact 32 therein. Simultaneously therewith, shoulder 32 will 
pass through first aperture portion 64 of aperture 62 of final contact 
support member 20. When the contact 22 is positioned by the locking 
engagement of opposed fingers 60a and 60b behind shoulder 30, shoulder 32 
will be in a position within aperture 62 permitting lateral movement of 
final contact support member 20. Such lateral movement causes intermediate 
extent 34 of contact 22 to be positioned within second aperture portion 
66. It can be seen that withdrawal of contact 22 is prevented by the 
engagement of shoulder 30 with fingers 60a and 60b of initial contact 
support member 18 as well as the engagement of shoulder 32 about the 
smaller second aperture portion 66 of final contact support member 20. 
Thus, independent redundant locking engagement of contact 22 with housing 
12 is provided. 
Further, extending portions 20a of final contact support member 20 extend 
exteriorly of housing 12 in its first unlocked position. Upon proper 
positioning of contacts 22 in housing 12, portions 20a may be pushed 
inwardly of housing 12 (either by finger pressure or use of a suitable 
tool) to a second position providing locking engagement of final contact 
support member 20 with contacts 22. Detent structure 27 within 
indentations 21 help position final contact support member between the 
first and second position. Interconnection of connector assembly 10 with a 
mating connector is prevented unless final contact support member 20 is 
moved to a locking position. Without moving contact support member 20 to a 
locking position, portions 20a will be maintained exteriorly of housing 12 
blocking interconnection with a mating electrical connector. Thus, 
interconnection of connector assembly 10 with a mating connector can only 
be achieved when contacts 22 are properly locked within housing 12. 
While the redundant locking mechanisms shown and described herein provide 
for securing locking of contacts 22 in housing 12, thereby preventing 
inadvertent withdrawal of the contact therefrom, an appropriate tool (not 
shown) may be employed to spread open fingers 60a and 60b allowing removal 
of the contacts. In this regard final contact support member 20 may be 
laterally moved back to its first position allowing removal of contacts 22 
from housing 12. Such removal may be necessitated by the need to replace 
or reposition a contacts 22 within housing 12. 
Various changes to the foregoing described and shown structures would now 
be evident to those skilled in the art. Accordingly, the particularly 
disclosed scope of the invention is set forth in the following claims.