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Патент USA US3069662

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1. 4
Dec. 18, 1962
P. GRECO
3,069,652
ELECTRICAL CONNECTOR FOR PRINTED CIRCUIT BOARDS
Filed March 23, 1959
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INVENTOR.
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BY
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Dec. 18, 1962
P. GRECO
3,069,652
ELECTRICAL CONNECTOR FOR PRINTED CIRCUIT BOARDS
Filed March 23, 1959
2 Sheets-Sheet 2
INVENTOR.
P£r£e Geéaa
BY égwzfw
United States Patent ()?lice
Fatented Dec. 18, 9'62
1
2
3,069,652
Another object of this invention is to provide an elec
trical connector for making multiple contacts to the wir
ing on a printed circuit board in which each of the contact
ELECTRE‘JAL CONNECTOR FOR PRINTED
CIRCUKT BOARDS
Peter Green, Norwallr, Comm, assignor to Burndy Cor
poration, a corporation of New York
Filed Mar. 23, 1959, Ser. No. 801,372
2 Claims. (Cl. 339-176)
This invention relates to electrical connectors and,
more particularly, to electrical connectors for connection 10
members of the connector may be individually and readily ,
removed from the receptacle.
Another object of this invention is to provide an elec
trical connector of this type in which the spring contact
member is resiliently biased by a simple and inexpensive
means.
more faces of a printed wiring board.
In recent years printed circuit or Wiring boards for
Still a further object of this invention is to provide an
electrical connector of this type in which each of the
contact members is positively locked to the housing to
prevent movement in either direction of the contact and
mounting and interconnecting electrical‘ components have
which is capable of resisting relatively high forces tend
to one or more electrically conducting surfaces on one or
‘been widely used in the electronic art. Such boards have, 15 ing to accidentally remove the contact.
in general, been manufactured with the printed wires
in one embodiment of this invention an electrical con?
terminating in aligned parallel arrangement along one
nector is provided in which a receptacle body has an elon
edge to form a terminal strip. This edge containing the
gated aperture with a plurality of slots therein. Each
aligned termination of the printed wiring is generally used
of the slots includes a groove having a projection disposed
as the plug portion of a connector and inserted into a cir 20 in it, which forms a front locking shoulder. A rear
cuit receptacle which may comprise an array of spring
locking shoulder is also associated with each of the slots.
members mounted in a suitable housing. Connection to
A spring contact member is inserted into and supported
the remainder of the circuit is then accomplished by con
by the sides of the slot and includes a resilient reinforcing
portion and a resilient contact portion which extend into
necting a conductor to the spring contact members ex
ternally by a variety of means such as crimping, indent 25 the groove portion of this slot. An opening is provided
ing, soldering or wrapping the wire to the terminal of the
in the contact member which receives the projection in
the groove to lock the contact member against Withdrawal
spring contact.
and a struck-up portion is also provided which co-acts
in order to assure proper contact between the connector
spring and the plug board, the ?nger or spring contact
with the rear shoulder to prevent overinsertion of the
has generally been pretensioned, which causes consider 30 contact member and properly locate the contact member
within the slot.
able wear in the thin foil conductors of the printed cir
cuit boards due to the high insertion forces necessary to
Another feature of this invention is the use of the con
complete the connection. When the spring contact pres
tact member which may be punched from strip material
sure is red ced to affect a corresponding reduction in the
in a simple and economical manufacturing process.
These and other objects and features of this invention
wear on the printed circuit board, a poor electrical con 35
tact often results. These con?icting requirements of re
will become more apparent by reference to the following
duced spring contact pressure to minimize wear and in
creased spring contact pressure for better electrical char
acteristics have resulted in compromises which often were
unsatisfactory.
description taken in conjunction with the accompanying
drawings in which:
FIG. 1 is a top plan view of the electrical contact used
40 in a connector of this invention;
The spring contact member has in the past generally
FIG. 2 is a side view in elevation of the contact mem
been permanently mounted in the receptacle housing.
ber shown in FIG. 1;
Thus the failure of a single contact has necessitated the
FIG. 3 is a side view in cross section of the electrical
scrapping of the entire receptacle. It has been long rec
connector of this invention showing a pair of contact
ognized that it would be desirable to have a receptacle 45 members inserted therein;
in which the individual spring contacts could be inserted
FIG. 4 is a perspective view partly in cross-section of
into and removed from the receptacle independent of the
the electrical connector of this invention showing a coin
other contacts. This would allow the attachment of
tact member inserted therein;
the contact to a wire prior to its insertion into the recep
FIG. 5 is a front elevational view of the electrical contacle. Moreover, it would allow the removal and re
nector of this invention;
placement of individual contacts.
FIG. 6 is a partial view in perspective showing a printed
However, it has also been recognized that a removable
circuit board and electric connector of this invention
contact must be capable of withstanding forces such as
prior to connection;
pulling on the attached wire which tends to accidentally
FIG. 7 is a cross-sectional view showing the indexing
remove the contact from the housing. Merely using a 55 means for the electrical connector of this invention; and
struck-up portion of the contact as a stop to resist acci
FIG. 8 is a cross-sectional view illustrating the shape‘
dental removal has not been entirely satisfactory because
of the central passageway taken between the bottom of
such a portion can be deformed quite easily.
the printed circuit board receiving slot and the rear lock
ing shoulder.
One of the objects of this invention, therefore, is to
provide a simple and inexpensive type of connector for 60
Referring to FIGS. 1 and 2 of the drawing, an elec
making electrical connections to one or more electrically
conducting strips on one or more faces of a printed cir
cuit board in which each spring contact is resiliently
biased without overstressing the contacted strip.
trical contact member for use in the connector of this in
vention is therein shown to comprise a contacting portion
10, a support portion 12 and a wire attaching portion 14.
The wire attaching portion 14 comprises a U-shaped in
".1
aoeacee
sulation shroud or insulation grip l6 and a wire gripping
‘section 13. The U-shaped shroud grip and wire grip
16 and 13 are crim'ped about an electrical wire as here
inafter explained. ,
‘I The longitudinally extending support portion 12 of
the electrical contact member is made from sheet metal
stock from which a rear locking ?nger 2th is formed or
@
lclaim:
1. An electrical connector for a printed circuit board
comprising: an insulating housing having a front and a
rear face and a plurality of spaced apart, parallel, con
tact receiving bores therethrough from face to face, and
a transverse, printed circuit board receiving slot into
said front face intersecting the forward part of each of
said bores; each of said bores having a constriction
formed therein, and an upstanding projection formed in
struck up. The support portion 12 is terminated by out
'wardly projecting integral arms 21a and 21b, which,
together with the end bridge portion 23 joining the arms 10 said forward bore part; an electrical contact of con
21a and 21b, de?nes a slot 25. A resilient reinforcing
ductive metal disposed in each of said bores, each of
?nger 24 is attached to one end of the support portion
said contacts including a relatively ?at body portion, slot
12 and has a free end portion normally projecting away
de?ning arms integrally extending from said body por
tion, means joining the distal ends of said arms closing
than the Width of the support portion 12. The ocntact
is terminated by a contact ?nger 22 having a Width less 15 said slot, a ?rst resilient ?nger having a proximal end
integrally depending with a reverse bend from said slot
than the width of the support portion 12. The contact
closing means and having a distal mating contact err
?nger 22 is bent back on itself as shown in FIG. 2, and
gaging end which is disposed in said transverse slot,
the reinforcing ?nger 24 has its free end in abutting rela
a second resilient ?nger having a proximal end integral
tion thereto providing a resilient reinforcement or bias
‘against deformation of the contact ?nger 22. The slot 20 ly depending from said body portion and having a dis
tal end abutting a surface of said ?rst ?nger to bias said
de?ned by arms 21a and 21b and bridge 23 form a front
locking shoulder 26.
?rst ?nger distal end away from said ?at body portion,
said ?rst and second ?ngers being transversely centered
As shown in FIGS. 3-5‘, and 8, the electrical con
‘motor of this invention includes ‘an insulating housing
or receptacle .28 ofv plastic or other suitable insulating
with respect to said ?at body portion and of a width less
material,
body being de?ned by parallel upper and
of flat body portion which extend beyond said ?ngers,
lower leans 27 joined at their ends by parallel side walls
'29. The walls 27 have at spaced intervals inwardly
and a third ?nger struck up from said ?at body por
tion and longitudinally spaced from said ?rst and sec
ond ?ngers; said bore constriction having a central pas~
projecting separating ribs 31 de?ning slots 32 which
than said flat body portion to provide a pair of margins
'are arranged-in opposed relationship to each other. Each 30 sageway of substantially T shape, the “leg” of the T
slot 32 includes a groove 34. Located Within each groove
being adapted to pass said ?rst and second ?ngers while
34- is a projection on sloped toward the rear of the hous
the “cross” of the T is adapted to pass said ?at body
ing forming the front ldcking shoulder 38 which coacts
portion, the ends of the “cross” interlocking with said
pair of margins to prevent transverse movement of said
I An electrical conductor 46 has its insulation 42 stripped 35 contact; whereby each said contact may be inserted
from said housing rear face into said respective bore,
back from the wire 44 ‘a given distance and the elec
through said T shaped constriction, said slot closing
trieal contact member 12 shown in FIGS. 1 and 2 then
‘with the slot oil the contact member.
has its shroud gripping portion 16 crimped about the elec
means snapping over said forward bore projection to
trical insulation 42 and its Wire gripping portion 18
abut therewith, said ?rst ?nger distal mating contact en
gaging end being disposed in said transverse slot, and
‘crimpyed about the conductor 44 to form a mechanical
and electrical connection to the conductor 40. The con
tact member 12 ‘is then inserted into the slot 32. The
"contact ?nger 22 extends into the groove 34 and the
said third ?nger engaging the rear of said bore con
striction to prevent overinsertion of said contact; and
whereby each said contact may be released from said
respective bore by de?ecting said slot closing means away
contact ?i'e'rnber 12 is supported by the shoulders of the
from said forward bore constriction.
groove 32 allowing the contact ?nger 22 freedom to ?ex
2. An, electrical connector for a printed circuit board
within the groove. Thus the groove 34 and the space 45
‘above the shoulders 32 form a T shaped opening as
‘shown in FlGURES 4 and 3 of the drawing. The con
‘tact member 12 is inserted until the rear locking ?nger
2t) abuts the rear locking shoulder 46 and prevents fur
ther insertion. At this point the front locking shoulder
comprising: an insulating housing having a front and a
rear face and a plurality of spaced apart, parallel, con
tact receiving bores therethrough from face to face, a
transverse, printed circuit board receiving slot into said
front face intersecting the forward part of each of said
bores, and each of said bores having a constriction
526 of the slot ?ts over the ramp projection 38 in the
formed therein; an electrical contact of conductive metal
groove ‘"4- to prevent the withdrawal of the contact.
disposed in each of said bores, each of said contacts in
‘Wire-‘i1 it is desired to withdraw the contact from the
cluding a relatively ?at body, a ?rst interlock means
housing 28, it is merely necessary to disengage the front
integral with the forward portion of said contact body,
locking shoulder 26 from the projection 38.
a ?rst resilient ?nger having a proximal end integrally
Referring to FIGS. 6 and 7 of the drawing, it is clear
depending from said ?rst interlock means and having a
that to make the proper circuit connections, the printed
distal mating contact engaging end which is disposed
circuit board 45 must be properly oriented within the
in said transverse slot, a second resilient ?nger having
connector housing 28. The printed circuit board 48 is
depicted with a terminal strip 49 designed, when properly 60 a proximal end integrally depending from said body
portion and having a distal end abutting a surface of
oriented, to make contact with contact member 51. To
said ?rst ?nger to bias said ?rst ?nger distal end away
provide for this orientation a slot 5% is cut in the cir
from said ?at body portion, said ?rst and second ?n
cuit board 1&8, and an orienting stub 52 is located in pre
gers being transversely centered with respect to said ?at
determined slots of the housing 28. The orienting de
vice 52 is a U-shaped member having locking slots 56 65 body portion and of a Width less than said ?at body por
tion to provide a pair of margins of ?at body portion
and 58 cut out of its top and bottom arms. These
which extend beyond said ?ngers and a second interlock
locking slots co-act with the projections 38 in each of the
means integrally formed on said ?at body portion and
top and bottom grooves 34 of the housing to retain the
longitudinally spaced from said ?rst and second ?ngers;
U-shaped member 52 therein and to thus provide the
proper orientation.
70 said bore constriction having a central passageway of
substantially T shape, the “leg” of the T being adapted
7 While speci?c embodiments of this invention have been
to pass said ?rst and second ?ngers while the “cross”
shown and described, it will be understood that they are
of the T is adapted to pass said ?at body portion and
illustrative and that various modi?cations may be made
said ?rst interlock means, the ends of the “cross” inter
therein without departing from the scope and spirit of
this invention.
75 locking with said pair of margins to prevent transverse
5
3,069,652
movement of said contact, and a ?rst and second bore
interlock means; whereby each said contact may be in
serted from said housing rear face into said respective
bore, through said T shaped constriction, said contact
?rst interlocking means snap looking into interlock with 5
said bore ?rst interlock means to prevent removal of said
contact from said bore, and said second interlock means
engaging said bore second interlock means to prevent
overinsertion of said contact; and whereby each said
contact may be released from said respective bore by dis- 10
engaging said contact ?rst and bore ?rst interlocking
means.
6
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,231,417
2,260,509
2,688,123
2,742,626
2,853,689
2,875,425
2,882,511
2,902,665
2,904,711
Nero ________________ __ June 26, 1917
Chirelstein ____________ __ Oct. 28, 1941
Benham et al. ________ __ Aug. 31, 1954
Collins et al. ________ 1. Apr. 17, 1956
Jackson et al. ______ __ Sept. 23, 1958
Gilbert ____________ __ Feb. 24, 1959
Mason ____________ __. Apr. 14, 1959
D’Amico ____________ __ Sept. 1, 1959
Burtt ct al. __________ __ Sept. 15, 1959
UNITED STATES PATENT OFFICE
CERTIFICATE OF QOHREC'HUN
Patent N00 3VO69E6S2
December 18‘I 1962
Peter Greco
It is ‘hereby certified that error appears in the above numbered pat
ent requiring correction and that the said Letters Patent should read as
corrected below.a
Column 3V line l4u for “than the widthM read rm from the
surface “a;
same line 149
for "'ocntact“I read “1 contact as
o
Signed and sealed this 18th day of June 19630
(SEAL)
Attest:
‘ERNEST w. SWIDER
Attesting Officer
DAVID L LADD
Commissioner of Patents
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