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Патент USA US3023402

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United States Patent O??ce
3,023,396
Patented Feb. 27, 1952
2
1
3,023,396
SOCKET CUNTACT
George J. Swanson and Edward Kokalas, Sidney, N.Y.,
assignors to The Bendix Corporation, a corporation of
Delaware
Filed June 13, 1957, Ser. No. 665,557
3 Claims. (Cl. 339--25S)
milling, in the manner to be described. The spring 11
is made of sheet metal, and is applied to member 10 in a
permanent manner by fastening means which, in the con
tact shown, is integral with spring 11. The socket mem
ber is designed to receive a pin 16 of a plug member 12
so as to make secure, non-arcing contact, therewith, while
permitting the ready separation of the pin and socket
member by movement of the two axially away from each
other.
This invention relates to electrical apparatus and more
Socket or body member 10 is preferably made from
particularly to electrical connectors of the type wherein 10 copper alloy bar stock which has been cold drawn after
electrical connections are made by inter?tting plug and
heat treatment. In one successful embodiment, the cop
socket contacts.
per alloy consists of about 60% copper, .5 to 1% tin,
One of the objects of the present invention is to pro
.4 to 1% lead, .1% or less iron, and the remainder zinc.
vide a socket contact of novel construction for use in
In another suitable embodiment the copper alloy con
15
readily separable electrical connectors of the pin and
sists of a minimum of 96.5% copper, .85 to 1.35%
socket type. Another object of the invention is to pro
nickel, .15 to 35% phosphorous, .35 to .65% tellurium,
vide a socket contact which although small in size pro
a maximum of .2% iron, at maximum of .1% lead, and
vides surer and more forceful electrical connection be
tween the socket and the pin of a socket connector.
a maximum of 1% zinc.
.
11 is preferably formed from a blank cut in
A further object is to provide a substantially rigid 20 theSpring
form of a T from fully heat treated copper alloy
socket contact having pin-retaining and contact-making
sheet stock, such as “Berylco #10” containing about .24
spring means associated therewith, the body of the socket
to 2.7% cobalt, .38 to .50% beryllium and the remainder
contact and the spring means being of such construction
copper. Another excellent non-magnetic metal from
that the spring means contacts the pin forcefully even
which spring 11 may be made is known commercially as
25
though the contact and spring are of small size.
“Inconel.” This is a high nickel alloy which need not
Another object is to provide a socket contact of the
be plated and which is less abrasive on the pin contact.
type indicated in which the socket contact and the pin
Spring steel may also be used in making spring 11, if
retaining and contact-making spring means associated
therewith are protected from damage even though a pin
or probe should be inserted in the socket contact in
marked misalignment therewith.
A still further object is to provide a novel socket con
tact assembly of the type described which has a long
desired.
’
One end of body member 10 is drilled to provide a
bore 14 for slidably receiving the pin 16 of the afore
mentioned plug member 12. The open end or mouth of
bore 14 is preferably made bell-shaped at 15 to facilitate
entry of pin 16, which has a diameter only slightly less,
usually about .002 to .005", than the diameter of bore
The above and further objects and novel features of 35 14. The other end of member 10 is likewise drilled and
the invention will more fully appear from the following
partially cut away at one side to provide a suitable
detailed description when the same is read in connection
recess 17 in which the end of an electrical conductor may
' with the accompanying drawings. It is to be expressly
be secured by soldering or other suitable means. Inter
understood, however, that the drawings are for the pur
mediate its ends, member 10 is machined to form two
40
pose of illustration only and are not intended as a de?ni
annular grooves 19 and 20, the ?rst of which is utilized
tion of the limits of the invention.
in mounting the contact in a resilient support or insert,
In the drawings, wherein like reference characters re
such as in the manner disclosed in Uline et al. US.
fer to like parts throughout the several views,
Patent No. 2,563,762.
FIG. 1 is a view in plan of one form of socket contact
Groove 20 is utilized, in the manner to appear herein
embodying the present invention, a male contact or pin, 45 after, for mounting spring 11. Such spring has a main
shown in phantom lines, cooperating therewith;
longitudinally extending ?nger 21, shown at the top in
FIG. 2 is a longitudinal sectional view of the socket
FIGS. 2 and 3, which extends from a position adjacent
member, the section being taken generally on the line
but spaced from the free end of body 10 rearwardly
2-2 of FIG. 1, certain parts being shown in elevation;
along the body to the groove 20 where it is provided
FIG. 3 is a longitudinal sectional view of the socket 50 with oppositely extending wings 22 which are bent to
member, the view being similar to FIG. 2 except that a
form a collar tightly ?tting into groove 20. Preferably
fragmentarily shown pin member is engaged in the socket
groove 20 has a radial depth substantially equal to the
and effective operating life.
contact;
FIG. 4 is a view in vertical transverse section taken
generally along line 4—4 of FIG. 3;
thickness of wings 22 so that the resulting collar lies '
55 flush with the main outer circumference of the socket.
The ?nger 21 is substantially straight and lies substan
tially parallel to the longitudinal axis of body 10 through
out the portion of its length from the collar formed from
from;
wings 22 forwardly toward the free end of the ?nger.
FIG. 6 is a view in longitudinal axial section through
Finger 21 is of such width that substantially no portion
the spring means of the socket contact prior to the as 60 thereof lies outwardly of the outer circumference of
FIG. 5 is an enlarged fragmentary view in plan of the
socket member, the spring means being omitted there
sembly-of such spring means on the socket member;
FIG. 7 is a view in bottom plan of the spring means;
and
‘
body 10 even when a pin 16 is received in bore 14.
As shown most clearly in FIGS. 6, 7, and 8, spring
member 11 is provided with shallow ?anges 24 which
FIG. 8 is a view in end elevation of such spring means,
strengthen the ?nger against de?ection in that portion
the view being taken in the direction from left to right 65 adjacent the collar. vIn order that ?anges 24 will not
in FIG. 6.
interfere with or bind upon body 10, such body is pro
In the embodiment illustrated in the accompanying
vided with a ?rst transversely extending slot 25 which
drawings, by way of example, the novel electrical socket
has a radial depth somewhat greater than ?anges 24.
contact of the invention includes only two parts—a body
or a socket member 10 and a contact spring 11. In the 70 In the embodiment shown, slot 25 is of such width axially
of body 10 that its rear end extends partially into groove
embodiment shown the body is made in the form of a
20 and its forward end intersects the inner end of bore
rigid metallic bar suitably machined, as by drilling and
3,023,398
3
all
14. Although such intersection of bore 14 by slot 25 is
not necessary in carrying out the invention, such con
struction is preferred since it allows bore 14 readily to
be cleaned of foreign matter as by the application of a
or too dif?cult to engage and disengage the pin and
socket contacts. The present construction is such that
the force required to engage a pin with the socket or
blast of air to its outer end.
Slot 25 eliminates any
disengage it therefrom will remain reasonably constant
during long periods of use. The greater breadth of
blind pocket which would otherwise interfere with the
?nger 21, and the strengthening thereof adjacent the root
proper circulation of the plating solution when body It} IS
by flanges 24, insure satisfactory spring pressure even
though the pin and socket assembly may be quite small
electroplated.
Forwardly of slot 25 body 10 has a broad ?atted por
in size. The engagement or substantial engagement be
tion 26 having an axial width substantially exceeding 10 tween the main extent of ?nger 21 and of ?atted portion
the diameter of bore 14. The ?atted portion 26 is so
26, as well as the reception of projection 31 in slot 27,
positioned on body 19 that the central longitudinal zone
effectively maintains ?nger 11 from unwanted turning of
of the ?atted portion lies at a distance from the longi
the one relative to the other. The provision of a bore
tudinal axis of body 10 a distance substantially equalling
14 which is unbroken for a major part of its length in the
the radius of groove 20. The wall of body it,‘ at the 15 entering end thereof, except for groove 27 which is sub
?atted portion is of reduced thickness, as shown in FIGS.
stantially elfectively closed by projection 31, insures that
2 and 3, but such thickness is su?icient to give it adequate
neither the socket member nor the spring will be fouled
strength to resist deformation by a pin or probe upon the
or damaged by carelessly applied contact pins or probes.
insertion or withdrawal of the latter. Thus, with the
There is thus provided an electrical socket assembly
exception of the zone of the wall of the bore in the
which is highly ef?cient in effecting a good electrical
vicinity of the second or forward transverse slot 27, to
connection and which is exceptionally durable in use
be described, the socket provides an unbroken wall at
under the most severe adverse conditions. The assembly
the ‘pin-‘receiving bore through the major extent of that
is also advantageously made of only two parts of simple
portion thereof adjacent the open end of bore 14.
construction, such parts being readily and inexpensively
The above mentioned second transverse slot 27 is 25 made and assembled in a manner which will insure the
provided at the free end of body 10 immediately to the
desired engaging and disengaging force.
rear of the annular end portion 18 at the free end of the
Although only a single embodiment of the invention
body. In the embodiment shown, slot 27 has a radial
has ‘been illustrated in the drawings by way of example,
depth such that the edge surfaces 29 of the slot lie some
it is to be expressly understood that various changes,
what outwardly of the diameter of bore 14. Preferably 30 such as in the relative dimensions of the parts, the mate
also the slot is in the form of a truncated V in axial
rials used and the like, may be made therein without de
section to insure freedom of movement of the free end
parting from the spirit and scope of the invention as will
30 of spring 11. As shown, the free end of the ?nger
now be apparent to those skilled in the art.
is downwardly and then upwardly bent to form a pro
What is claimed is:
jection or dimple 30 on the ?nger. Finger 21 is of gen 35
1. An electrical socket contact comprising an elon
erally uniform width, in the embodiment shown the ?nger
gated cylindrical metallic body having an axial cylindri
tapering slightly toward its free end. End 30 has a
cal bore in one end and terminating short of the other
width somewhat greater than the distance between the
end, an elongated external axially extending ?atted zone
inner edges of opposite surfaces 29 of slot 27, as shown
in the wall of the socket contact around said bore, said
in FIG. 4.
40 ?atted zone extending from a position adjacent the open
Body 10 is preferably formed on a screw machine,
end of the bore to a location remote therefrom, a ?rst
which among other initial operations, forms the grooves
transversely extending slot in said ?atted zone adjacent
19 and 20 and the bore 14. Following this, the body
the open end of said bore and extending into said bore,
10 is further shaped by a series of transverse cuts which
a contact retainer comprising an elongated generally
form slot 25, ?atted portion 26, and slot 27. Such fur 45 straight resilient ?nger having a generally ?at inner face
ther cuts may be formed simultaneously, if desired, by
closely overlying and confronting said ?atted zone, the
a milling machine employing one composite cutter.
?nger having a width generally the same as the width of
Spring 11 is preferably ?rst blanked out of sheet stock,
the ?atted zone, and a length which is generally the same
the blank then being bent into the contour shown in
as the length of the bore, means rigidly to secure a ?rst
FIGS. 6, 7, and 8, wherein the wings 22 form the par 50 inner end of the ?nger to the socket body at a location
allel legs of an inverted U, and the ?nger 21 is bent
adjacent but inwardly beyond the inner end of said zone,
downwardly so that its free end 30 lies markedly below
means on the free end of the ?nger which projects into
its root.
the path of the bore when no pin is in the same, the
The spring 11 is applied to contact member 10 by
?nger being normally under tension urging the free end
wrapping the wings 22 on the former tightly around the 55 portion thereof inwardly toward the axis of the bore and
body 101 within groove 20. If desired, the ends of wings
the ?nger into contact with said ?atted zone, a second
22 may be suitably secured together or said wings may
transversely extending slot in said ?atted zone adjacent
be soldered, spot-welded, or similarly secured to body
the root of the ?nger and lying radially inwardly of and
10. After the spring member 11 has been thus applied
beneath the ?nger, and wherein the ?nger is secured to
to body 10, in the absence of a pin member in bore 14, 60 the socket body by a collar integral with the ?nger, and
the ?nger 21 is forcibly urged by its inherent springiness
comprising ?nger-reinforcing formations located along
into the position shown in FIG. 2 where the ?nger over
the respective side edges of the ?nger at the root there
lies and at least substantially contacts the ?atted portion
of, the formations overlying and being partially received
in said second transverse slot.
26 of body 10. In such position the depressed or dinipled
portion 31 on the free end of the ?nger projects a sub 65
2. An electrical socket contact comprising an elongated
stantial distance into bore 14, and the inner surface of
cylindrical metallic body having an axial cylindrical bore
portion 31 at least substantially contacts the bottom of
in one end and terminating short of the other end, an
slot 27. When a contact pin or plug such as pin 16 of
elongated external axially extending ?atted zone in the
plug 12 is inserted into bore 14, projection 31 on ?nger
wall of the socket contact around said bore, said ?atted
21 will be engaged by the pin and ?nger 21 will be thus 70 zone extending completely across the body, said ?atted
?exed outwardly, placing it under additional tension.
zone extending from a position adjacent the open end of
The spring thus yieldably presses the pin 16 against the
said bore to a location remote therefrom, a ?rst trans
opposite wall of bore 14 to provide good electrical con
versely extending slot in said ?atted portion adjacent the
nection. The pressure exerted on the contact pin by the
spring is so predetermined that it will never be too easy 75 open end of said bore and extending into said bore, a
second transversely extending slot in said ?atted portion
3,023,396
6
and extending into at least the end of said bore, a contact
retainer comprising an elongated resilient ?nger having
and extending into at least the end of said bore, a con
tact retainer comprising an elongated resilient ?nger hav
a generally ?at inner face overlying and confronting the
?atted zone of the body, the ?nger having a width which
the ?atted zone of the body, the ?nger having a width
is at least a large fraction of the width of the ?atted zone
and a length which is generally the same as the length of
the bore, means rigid to secure the root end of the ?nger
to the socket at a location remote from the open end of
ing a generally ?at inner face overlying and confronting
which is generally the same as the width of the ?atted
zone and a length which is generally the same as the
length of the bore, an annular groove in the body rear
wardly of the ?atted zone, the radius of the inner surface
the bore, said last named means comprising a collar inte
of the annular groove being substantially equal to the
gral with the ?nger, the other free end of the ?nger lying 10 radius of the central longitudinal portion of the ?atted
adjacent and beyond the end of the ?atted zone at the
open end of the bore, ?nger-reinforcing formations lo
cated along the respective side edges of the ?nger at the
root thereof, the formations overlying and being partially
zone, means including a broad collar securely mounted
within the annular groove rigidly to secure the root end
of the ?nger to the socket, the other free end of the
?nger lying adjacent and beyond the end of the ?atted
received in said second transverse slot, and means on the 15 zone at the open end of the bore, and means on the free
free end of the ?nger to project into the path of. the bore
end of the ?nger to project into the path of the bore when
when no pin is in the bore, the ?nger being normally un
no pin is in the bore, the ?nger being normally under ten
der tension urging the free end portion thereof inwardly
sion urging the free end portion thereof inwardly toward
toward the axis of the bore.
the axis of the bore.
3. An electrical socket contact comprising an elongated 20
cylindrical metallic body having an axial cylindrical bore
References Cited in the ?le of this patent
in one end and terminating short of the other end, an
UNITED STATES PATENTS
elongated external axially extending ?atted zone in the
2,410,098
Muller _____________ __ Oct. 29, 1946
wall of the socket contact around said bore, said ?atted
Bergan ______________ __ Sept. 9, 1947
zone extending completely across the body, said ?atted 25 2,427,182
2,715,215
Flora _______________ __ Aug. 9, 1955
zone extending from a position adjacent the open end of
said bore to a location remote therefrom, a ?rst trans
2,716,744
Swanson et al. _______ .._ Aug. 30, 1955
206,628
Great Britain ________ .. Nov. 15, 1923
versely extending slot in said ?atted portion adjacent the
open end of said bore and extending into said bore, a
second transversely extending slot in said ?atted portion
FOREIGN PATENTS
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