U.S. patent number 3,786,401 [Application Number 05/189,672] was granted by the patent office on 1974-01-15 for contact socket.
This patent grant is currently assigned to Illinois Tool Works Inc.. Invention is credited to Chesley Jones, Ougljesa Jules Poupitch.
United States Patent |
3,786,401 |
Jones , et al. |
January 15, 1974 |
CONTACT SOCKET
Abstract
An integral electrical contact socket having a sleeve and a
plurality of spring arms folded back within the bore of the sleeve
and extending longitudinally thereof which enables the contact
socket to aggressively impinge an associated contact pin upon its
insertion in the socket. The contact arm may be twisted
substantially about its longitudinal axis which will provide firm
line contact with an associated pin.
Inventors: |
Jones; Chesley (Westlake
Village, CA), Poupitch; Ougljesa Jules (La Jolla, CA) |
Assignee: |
Illinois Tool Works Inc.
(Chicago, IL)
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Family
ID: |
22698322 |
Appl.
No.: |
05/189,672 |
Filed: |
October 15, 1971 |
Current U.S.
Class: |
439/852;
439/851 |
Current CPC
Class: |
H01R
13/114 (20130101) |
Current International
Class: |
H01R
13/115 (20060101); H01r 009/12 () |
Field of
Search: |
;339/258R,258F,258P,258RR,258T,256R,256S,259R,259F,217S,17LF,17R |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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|
|
|
|
|
|
1,263,085 |
|
Apr 1961 |
|
FR |
|
893,055 |
|
Apr 1962 |
|
GB |
|
Primary Examiner: Champion; Marvin A.
Assistant Examiner: Pate, III; William F.
Claims
We claim:
1. A one-piece electrical contact socket adapted to receive an
associated contact pin through the mouth of the bore of the socket,
comprising a sleeve member with contact arms positioned within the
sleeve and integrally attached thereto at the mouth of the socket,
the contact arms extending generally longitudinally within the
sleeve and including preformed spring means forming a portion of
said arms and biased radially inwardly of the remaining portions of
the associated arms, a longitudinal segment of the remaining
portions of the arms bearing against a longitudinal segment of the
inner wall of the sleeve from the mouth of the socket extending
inwardly when the spring means is in a noncompressed state which
allows the spring means to lie flat and bear against the inner wall
of the sleeve when said spring means is in a compressed state while
maintaining aggressive electrical contact with a pin and maximizing
the aperture into which the associated pin is inserted, the portion
of the bore including the flat remaining portions of the arms
having a cross-sectional area substantially identical to the
aperture formed by the mouth of the socket.
2. An electrical contact socket in accordance with claim 1 which
includes a plurality of radially spaced spring arms extending
inwardly of the sleeve and integrally joined thereto.
3. An electrical contact socket in accordance with claim 1 wherein
the sleeve portion is polygonal, each side having an integrally
connected associated spring arm extending inwardly of the sleeve,
each spring arm including substantially identically configured
angled portions biased inwardly of the sleeve to provide uniform
electrical contact around the mating surfaces of an associated
contact pin.
4. An electrical contact socket in accordance with claim 1 wherein
the sleeve portion is generally cylindrical.
5. An electrical contact socket adapted to receive a contact pin at
one end thereof and to be electrically connected to wire at the
other end, comprising a contact portion and sleeve portion, the
contact portion including at least one spring arm extending
inwardly of the sleeve and integrally joined thereto, said spring
arm including a portion formed at an angle to the remaining portion
of the spring arm, the angled portion extending generally
longitudinal of the spring arm and intersecting the plane of the
remaining portion of the spring arm at a line which extends from
one longitudinal edge of the spring arm to the other, said line
extends at a small acute angle to the longitudinal axis of the
spring arm thereby providing aggressive line contact over a
substantial length of an associated contact pin and the spring
arm.
6. A one-piece electrical contact socket adapted to receive an
associated contact pin, comprising a sleeve member with contact
arms positioned within the sleeve and integrally attached thereto,
the internal walls of the sleeve member including grooves extending
longitudinally of the sleeve and adapted to receive the contact
arms to stabilize the arm and guide its movement relative to the
sleeve upon compression of the spring means, the contact arms
extending generally longitudinally of the sleeve and including
preformed spring means biased radially inwardly of the associated
arms, a portion of the arms bearing against the inner periphery of
the sleeve when the spring means is in a noncompressed state which
allows the spring means to lie flat against the inner periphery of
the sleeve when said spring means is in a compressed state while
maintaining aggressive electrical contact with a pin and maximizing
the aperture into which the associated pin is inserted.
7. A contact socket in accordance with claim 1 wherein the grooves
are radially aligned with an associated contact arm to allow the
arms to become substantially flush with an associated side wall
when compressed.
8. A one-piece electrical contact socket adapted to receive an
associated contact pin comprising a sleeve member with contact arms
positioned within the sleeve and including preformed spring means
which are portions of the contact arms twisted about an axis
generally longitudinally of the arms and biased radially inwardly
of the associated arms, a portion of the arms bearing against the
inner periphery of the sleeve when the spring means is in a
noncompressed state which allows the spring means to lie flat
against the inner periphery of the sleeve when said spring means is
in a compressed state while maintaining aggressive electrical
contact with a pin and maximizing the aperture into which the
associated pin is inserted.
Description
BACKGROUND OF THE INVENTION
The subject matter of the present invention relates generally to an
electrical socket contact for use with an associated pin member. In
particular, the present invention is concerned with a female
contact member having internal flexing contact arms integrally
associated with a sleeve or surrounding ferrule member. The contact
arms are particularly adapted to provide an efficient electrical
contact in microminiature environments.
Existing female contact members for establishing a separable
electrical contact in an electric circuit have utilized resilient
finger members suitably biased or deformed to engage a male pin
member under spring pressure. One of the principle advantages of
such a system is that one socket can accommodate pin members which,
due to production tolerance deviation, are slightly smaller or
larger than design size. However, most of these prior art efforts
to provide a socket member are of a multi-piece design. For
example, a contact cylinder having radially baised arms may be
situated within a preformed ferrule or sleeve. Electrical contact
between the cylinder and the ferrule is necessary to complete a
circuit between connecting wires and the spring arms. The contact
arms of the prior art are generally cantilevered from a fixed
cylinder and tend to provide only point contact between a pin and
the socket. Unsupported cantilevered contact arms tend to lose
spring pressure and consequently cause intermitent electrical
contact between the pin and socket. The space requirements in the
microminiature environments naturally require maximization of
spring energy in the flexing contact elements to provide a sound
electrical contact while maximizing the size of an associated pin
member to provide a firm and efficient mechanical joint.
SUMMARY OF THE INVENTION
It is a broad object of the invention to provide a socket
connection having internal flexing contact elements which are
capable of being efficiently made as a stamping from a single piece
of metal.
It is an object of the invention to provide a novel, one-piece
female contact member which maximizes spring energy in contact arms
in miniature environments.
It is a further object of the invention to provide a contact member
which will establish firm line contact with an associated pin
member.
It is yet another object of the invention to provide improved
wiping contact over an appreciable surface area of a pin member in
a socket member.
The foregoing and other objects and advantages are attained in the
present invention by providing a sleeve member having integral
spring contact arms folded over within the bore of the sleeve and
having portions biased radially inwardly of the sleeve for
aggressive contact with a pin member. The integral arms include
portions lying flat or closely juxtaposed to the inner wall of the
sleeve member which allows the entire arm member to be pressed flat
against the inner surface of the sleeve upon association with a pin
member. One embodiment of the invention provides for twisting a
portion of the contact arm substantially about the longitudinal
axis of the arm to provide aggressive line contact, rather than
point contact, with an associated pin member.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective, partially cutaway, view showing a
preferred embodiment of the socket member which is the subject of
the invention.
FIG. 2 is an end view of the socket contact shown in FIG. 1.
FIG. 3 is a sectional view taken along line 3--3 in FIG. 2.
FIGS. 4 and 5 are plan and end views, respectively, of the
preferred embodiment of the invention in an initial stage of
construction.
FIG. 6 is an end view of another embodiment of the invention.
FIG. 7 is a sectional view taken along the line 7--7 of FIG. 6.
FIG. 8 is an end view of another embodiment of the invention,
similar to that shown in FIG. 6 but showing a generally square
sleeve member.
FIG. 9 is a sectional view taken along line 9--9 of FIG. 8.
FIG. 10 is a perspective, partial cutaway, view of the embodiment
shown in FIGS. 8 and 9.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Turning now to the drawings, FIG. 1 shows a preferred embodiment of
female or socket contact 10. The contact body is an integral unit
including a sleeve or ferrule 12 having a plurality of contact
members or arms 14 folded back within the bore of the sleeve and
extending longitudinally within the sleeve. Each arm 14 includes at
least a portion 16 which extends radially inward of the sleeve. The
arms 14 also include at least a portion 18 lying flat against the
inner wall 20 of the sleeve. The portion of the arm 16 which
extends into the bore is preformed and biased inwardly to provide
the arm with substantial spring energy to electrically connect with
an associated pin socket (not shown) which may be inserted through
opening 22 in the socket.
In accordance with the teachings of the invention, the one-piece
socket 10 allows internally extending spring members to be
completely flattened against the inner wall of the sleeve 12. This
characteristic is especially important in providing a connector
system for microminiature environments. The integral, folded back
contact arms 14 of the invention will allow an associated pin to be
made of a maximum relative dimension in order to provide, as much
as possible, a structurally sound connection. The close
juxtapositioning of the arms to the inner walls will also allow a
maximum preforming or biasing of the inwardly extending portions
such as 16 in FIGS. 1-3. It should be apparent that the
maximization of spring energy in a contact system is especially
important.
Having observed the general details of the socket body 10,
attention may now be given to the particular manner of providing
and maximizing spring energy to a contact arm such as 14. Attention
is drawn to the fact that the radially extending portion 16, in the
preferred embodiment, is twisted or bent about an axis generally
longitudinal of the arm 14, or about an axis which is more
longitudinal than lateral to the arm 14. The arms 14 shown in FIGS.
1-3 are, therefore, deformed or bent about a line of intersection
such as 36. This line of intersection 36 serves as the hinge and
the basis for the spring energy in the contact system. The line is
shown to extend from one longitudinal side of the arm to the other
at a small acute angle A, which is shown to be substantially less
than 45.degree.. As a consequence, the associated pin or male
member (not shown) makes initial contact with the radially biased
portion 16 at a point 34 near the opening or aperture 22 in the
socket. As the pin continues to be inserted in the socket 10, a
firm, aggressive impingement with edge 38 of the biased portion 16
and with portions of surface 40 will result. As a consequence, a
smooth, controlled insertion force exerted by the associated pin
will provide the necessary and required electrical contact and
connection between two members. It is to be particularly noted that
the contact between the radially biased portion 16 and an
associated pin member will be a line contact extending a
substantial axial extent of the pin member.
While a socket, in accordance with the invention, may be
constructed of any number of arms, and the sleeve may take a
variety of cross-sectional configurations, the preferred embodiment
shown in FIGS. 1-3 describes four such integral arms in a square
sleeve. It is to be particularly noted that the angle B shown in
FIG. 2, as the angle which the terminal portion of the inwardly
extending arms makes with the remaining flat portion 18, governs
the radially inward extension of spring portion 16 and, therefore,
is indicative of the spring energy residing in the contact arms.
The unique twisting configuration of portions 16 enables a
plurality of arms, such as the four arms 14 shown in FIG. 2, to be
utilzied without limiting the inward bias of portions 16. If these
portions were to be biased in accordance with a normal cantilevered
spring arm, the amount of maximum biasing would be limited by the
width of the individual arms. In the present invention, the
placement of all of the portion 16 at angles consistent with one
another enables the initial flexure or spring energy to be
maximized without total dependence on the width of the arms.
In FIGS. 6-10 alternate embodiments of the invention are shown,
wherein the contact structure is similar to that described above,
as indicated by the application of identical reference numerals
with suffixes a and b added to the corresponding identical
elements. The structural features of these modifications of the
invention also provide for a one-piece socket connector having
spring contact arms adapted to completely flatten against the
internal wall of the sleeve thereby allowing maximization of spring
energy and allowing for maximization of size in the corresponding
pin member.
The contact socket 10a shown in FIGS. 6 and 7 is provided with a
generally cylindrical sleeve 12a having integrally attached
spring-like contact arms 14a bent over and extending within the
sleeve. While two contact arms 14a are shown, it should be apparent
that any number of contact arms can be provided and still come
within the scope of the invention. These bent over integral arms
14a include support portions 18a situated near the opening 22a and
at the extremity of the arm. The spring-like pressure and
aggressive contact is provided by the portions 16a which are biased
inwardly toward each other and provide the necessary spring energy
to allow an associated pin (not shown) to be inserted with a
smooth, controlled force.
The portions 18a of the arm advantageously provide intimate contact
at all times between the arm and the inner surface of the sleeve.
Such contact on either end of the biased portion 16a allows the
contact arm to be totally flat against the inner surface upon total
compression. Also, the support at either end of the spring portion
16a conserves the energy and gives a greater reaction force than a
true cantilever supported spring.
While the complete flattening of the integral contact arm 14a
against the inner surface will allow the spring energy to be
maximized and the dimension of the associated pin to be maximized
as discussed above, a further inventive feature is the provision of
guides or slots such as 30. These slots receive, and are radially
aligned with, associated contact arm members 14a. As a pin is
inserted in the socket, the bowed portion 16a will be depressed
against the bottom surface of the groove 30. Upon total depression,
the diametral distance between arms 14a will be substantially the
same as the diametral distance between the inner surfaces 20a. The
arms will be substantially flush with the inner wall. In accordance
with the discussions above, this will allow for further spring
energy to be built into the system and will allow a larger contact
pin to be associated with the socket.
In FIGS. 8 through 10, a further embodiment of the invention is
shown as a socket 10b having a square cross-sectional
configuration. As in the embodimetns shown in FIGS. 6 and 7, socket
10b is provided with integral folded back arms 14b having bowed
portions 16b providing the spring energy with which electrical
contact is achieved and insured. Substantially flat portions 18b
are situated at either end of the bowed portions to provide
additional support to the structure, as indicated above. Guides or
slots 32 may also be provided to increase the effective inner
diameter of the socket.
A further feature of guide or slot means 30 or 32 is the added
stability and structural integrity which they present to a
one-piece spring socket member. The axial force exerted on the
baised portion 16b will force the arm to move in only two
directions. The arm will be compressed radially against the inner
wall 20b and the extremity 18b will be forced in a direction
longitudinally of the socket. The guide means 32 or 30 will not
allow lateral movement of the arms 14a or 14b. Insertion of an
associated pin may be accompanied by slight rotation forces which
tend to impart lateral movement to arms. This additional stress on
a spring member of the size utilized in small environments could be
extremely deleterious to the life of the spring member. It is
apparent, therefore, that the provision of guides or slot means
increases the efficiency of a socket member.
For purposes of affording a more complete understanding of the
invention, it is advantageous to now provide a description of a
mode of manufacturing such a socket. As best shown in FIGS. 4 and
5, a blank 42 is provided having portions 12 and 14 which will
eventually be formed into the sleeve and contact members
respectively. The longitudinal edges of this blank will,
accordingly, form a seam, such as 26 shown in FIG. 1. The tab means
28 may serve to position the workpiece 42 for further deformation
and may aid in connection of a wire in portion 24 of the socket.
This connection may be of any type known in the art, such as
crimping or soldering or the like. Portions 16 are shown initially
deformed at angles substantially identical to each other. This will
provide the advantageous configuration shown in FIG. 2. Following
this stage in the manufacture, the arms 14 will be folded over on
top of portion 12 with portions 18 firmly and intimately contacting
the surface of element 12. At the same time, spring portions 16
will be allowed to flex inwardly and will thus retain all of the
spring energy for reaction with an associated pin member. After
these arms are placed in the folded over position, the body 12 may
then be deformed to provide the sleeve with either a square,
circular or polygonal cross section.
Thus, it is apparent that there has been provided, in accordance
with the invention, a female contact member having integral
internal flexing contact elements to establish separable electric
contact in an electrical circuit, and more particularly having
spring-like portions which are arranged within a sleeve to provide
a maximum of spring energy and allow cross section of an associated
pin member to be maximized. While the invention has been described
in conjunction with specific embodiments thereof, it is evident
that many alternatives, modifications, and variations will be
apparent to those skilled in the art in light of the foregoing
description. Accordingly, it is intended to embrace all such
alternatives, modifications, and variations that fall within the
spirit and broad scope of the appended claims.
* * * * *