U.S. patent number 3,871,736 [Application Number 05/399,240] was granted by the patent office on 1975-03-18 for connectors providing interconnection between closely spaced conductors and widely spaced terminals.
This patent grant is currently assigned to AMP Incorporated. Invention is credited to Clyde Thomas Carter.
United States Patent |
3,871,736 |
Carter |
March 18, 1975 |
CONNECTORS PROVIDING INTERCONNECTION BETWEEN CLOSELY SPACED
CONDUCTORS AND WIDELY SPACED TERMINALS
Abstract
Connectors are disclosed for making contact between an
electronic circuit module and a plurality of terminal pins mounted
in a frame and adapted to receive further electrical connections.
Each of the connectors is mounted in a respective slot in a housing
and includes a first portion projecting from one side of the
housing to engage a conductor of the electronic circuit module, a
second portion projecting from another side of the housing to allow
test access to the connector, and a third portion forming or being
in contact with the terminal.
Inventors: |
Carter; Clyde Thomas (Shermans
Dale, PA) |
Assignee: |
AMP Incorporated (Harrisburg,
PA)
|
Family
ID: |
23578742 |
Appl.
No.: |
05/399,240 |
Filed: |
September 20, 1973 |
Current U.S.
Class: |
439/389;
439/71 |
Current CPC
Class: |
H05K
7/1061 (20130101); G01R 1/0408 (20130101); G01R
1/0433 (20130101) |
Current International
Class: |
G01R
1/20 (20060101); G01R 1/00 (20060101); G01R
1/02 (20060101); G01R 1/04 (20060101); H05K
7/10 (20060101); H01r 009/08 (); H01r 013/54 () |
Field of
Search: |
;339/17,19,47-49,154,156,174,176,217,221,252,256,258 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
979,514 |
|
Jan 1965 |
|
GB |
|
1,133,620 |
|
Nov 1968 |
|
GB |
|
Primary Examiner: McCall; James T.
Assistant Examiner: Lewis; Terrell P.
Claims
What is claimed is:
1. An electrical connector mounted in a housing to make good
electrical and mechanical interconnection between a circuit board
attached to one side of the housing and a terminal adjacent the
opposite side of the housing, comprising:
a connector body having at least one retention projection extending
from each of two opposite sides of said body;
a resilient circuit board contacting arm comprising a simple beam
extending from said body and having a contact projection on the
free end thereof;
at least one pair of resilient, parallel, spaced apart legs
depending from said body and adapted to resiliently grip said
terminal therebetween; and
a resilient test access arm integral with one of said legs and
adapted to extend therefrom in cantilever fashion to project from
said housing thereby providing constant test access to said
connector.
2. An electrical connector mounted in a housing to make good
electrical and mechanical interconnection between a circuit board
attached to one side of the housing and a terminal adjacent the
other side of the housing, comprising:
a connector body having at least one retention projection extending
from each of two opposite sides of said body;
a resilient circuit board contacting arm extending from said body,
said arm comprising a loaded beam both ends of which are attached
to the body and having a contact projection intermediate the ends
thereof;
at least one pair of resilient, parallel, spaced apart legs
depending from said body and adapted to resiliently grip said
terminal therebetween; and
a resilient test access arm integral with one of said legs and
adapted to extend therefrom in cantilever fashion to project from
said housing thereby providing constant test access to said
connector.
3. An electrical connector mounted in a housing to make good
electrical and mechanical interconnection between a circuit board
attached to one side of the housing and a terminal adjacent the
opposite side of the housing, comprising:
a connector body having at least one housing engaging projection
extending from one side of said body;
at least one resilient arm extending from a side of said body
opposite said projection, said arm adapted to bias said projection
into engagement with said housing;
a cantilever circuit board contacting arm extending from another
side of said body, said contacting arm comprising a beam folded
upon itself and having a contact projection on the free end
thereof; and
an integral terminal depending from the side of said body opposite
said contacting arm, said terminal having a rectangular section
greater thickness than the body of said connector and being rotated
about its own axis from the plane of said body.
Description
BACKGROUND OF THE INVENTION
1. The Field Of The Invention
The present invention relates to improved connectors for making
side or edge contact with conductor pads of circuit boards
including electronic modules and in particular to connectors
adapted to make side or edge engagement with circuit boards contact
pads while providing ready access test access for the contact
point.
2. The Prior Art
Electronic circuit modules are produced in many shapes and forms
and are fabricated in a variety of sizes, weights and thicknesses.
Each module is provided with a circuit or circuits which perform
certain desired functions, for example, amplifiers, counters,
registers, memory storage, etc. Most of the circuits used are in
the miniature and subminiature size range and are therefor
difficult to handle. For this reason many of these circuits, which
are also called "chips" and/or "flat-packs," are mounted on flat
boards with one or more conductive lead extending from the circuit
to the edge of the boards for interconnection to a utilization
device and/or to a source of electrical energizing potential.
There are known connectors for making connection between an
electronic circuit and a source and/or utilization device. For
example, U.S. Pat. No. 3,107,319 teaches a modular component to
printed circuit connector with a cantilever leg providing a
resilient contact with a printed circuit board. Another leg is used
for solder contact with circuit components and is not suitable for
making edge or surface contact with a circuit module. U.S. Pat. No.
3,622,950 shows a connector assembly having integral terminal
posts. Conductors from a circuit module are tightly received
between biased arms to make connection with the terminal contact.
This connector requires an additional member to achieve the
biasing.
SUMMARY OF THE INVENTION
The present invention is an electrical connector for electrically
and mechanically interconnecting spaced terminal pins with more
closely spaced edge or surface contact pads on a circuit board
carrying an electronic module. The connector includes a body, a
resilient contacting arm lying in the plane of the body and adopted
to engage contact pads of the circuit board, a terminal pin
extending from the body for further electrical interconnection, and
test access means extending from the body to project from a housing
to provide a constant test point. The housing includes a circuit
board and electronic module receiving portion and a plurality of
connector receiving grooves formed along at least part of the
periphery of the housing.
It is therefore an object of the present invention to construct a
new and improved electrical connector which will provide
sufficiently high contact forces to form a gas tight seal at the
electrical junction between a contact arm of the connector and the
associated circuitry module contact pad.
It is another object of the present invention to produce electrical
connectors capable of making either edge or surface engagement with
contact pads of a circuit module.
It is yet another object of the present invention to construct
electrical connectors which can mate with terminal posts or have
integral terminal posts.
It is still another object of the present invention to produce an
electrical connector which, when mounted in an associated housing,
will have a portion thereof projecting from the housing and serving
for test access to the contact.
The foregoing and other objects of the present invention will
become apparent to those skilled in the art from the following
detailed description taken with reference to the accompanying
drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view, partly in section, of a housing
having the first embodiment of the subject connector mounted
therein;
FIG. 2 is a partial transverse vertical section through the housing
of FIG. 1;
FIG. 3 is a side elevation of the first embodiment of the subject
connector;
FIG. 4 is a schematic top plan view showing the orientation of the
first embodiment connector in the housing;
FIG. 4a is a bottom plan view of a fragment of the housing showing
two loaded and one empty cavities;
FIG. 5 is a perspective view, partially in section, of a housing
having a second embodiment of the subject connector mounted
therein;
FIG. 6 is a partial transverse vertical section through the housing
of FIG. 5;
FIG. 7 is a side elevation of the second embodiment of the subject
connector;
FIG. 8 is a schematic top plan view showing the alignment of the
second embodiment connector in the housing;
FIG. 9 is a perspective view, partly in section, of a housing
having a third embodiment of the subject connector mounted
therein;
FIG. 10 is a partial transverse vertical section view through the
housing of FIG. 9;
FIG. 11 is a side elevation of the third embodiment of the subject
connector;
FIG. 12 is a schematic top plan view showing the mounting of the
third embodiment connector in the housing;
FIG. 13 is a perspective view, partially in section, of a housing
having a fourth embodiment of the subject connector mounted
therein;
FIG. 14 is a partial transverse vertical section through the
housing of FIG. 13; and
FIG. 15 is a schematic top plan view showing the orientation of the
fourth embodiment connector devices in the housing.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The several embodiments of the present connector are described
making interconnection with packaged electronic modules, such as
may be found in computers and the like. In such cases the
electronic modules 10 are mounted on a rigid circuitry boards 12
having electrical leads 14 printed thereon extending radially
outwardly to an edge portion of the board where a contact pad is
formed on either the edge or surface of the board. Since the
modules are of extremely small size, the leads must be made to
radiate therefrom in order to provide sufficient spacing at the
sides of the board for making contact with the related circuitry,
such as either a source of potential or a utilization device. The
present connectors serve to make good electrical and mechanical
interconnection between pads having a first grid spacing and
terminal pins having a second larger grid spacing.
Turning now to the first embodiment of the subject connector, see
FIGS. 1 to 4, a housing 16 has a stepped central recess 18
extending substantially its entire longitudinal length. A plurality
of spaced, parallel connector cavities 20 are formed along at least
one wall of the housing. Each cavity 20 includes a notch or recess
22, see FIG. 4a, and communicates with recess 18 via longitudinal
slot 24. The housing 16 is mounted on a chassis or support frame 26
in close proximity to a plurality of apertures 28 and is fixed in
position by conventional mounting means 30, such as nuts and bolts
or screws. The circuit board 12 is fixedly mounted in the housing
16 by conventional mounting means 32 and a single mounting means
can be used to mount both the board on the housing and the housing
on the chassis if so desired.
The first embodiment of the subject connector 34 is formed from
premilled flat stock and has a transverse step 36 (see FIG. 4)
extending through body portion 38. An integral terminal pin 40 of
square section depends from the thicker bottom side of the body
portion 38. The terminal pin 40 is rotated about its own axis to be
angularly positioned with respect to the plane of the connector.
Resilient arms 42, 44 extend in cantilever fashion from opposite
sides of body portion 38 and a folded cantilever arm 46 extends
from the top of the body portion. A contact projection 48 is on the
free end of the arm 46. Retention projections 50 extend from
opposite sides of the thicker lower part of the body portion
38.
The first embodiment connector 34 is mounted in the cavities 20
from the bottom of the housing 16 in an alternating reversed
configuration (see FIG. 4) so that the contacts 48 are spaced close
enough to engage pads 14 on the circuit board 12 while the terminal
pins 40 are spaced somewhat further apart enabling other
connections to be made therewith. It should be noted that the
apertures 28 are formed in two spaced, parallel rows and that the
terminal pins 40 are inserted in alternate apertures to achieve the
desired spacing.
The connectors 34 are inserted from the bottom of the housing 10
into slots 20 with one resilient arm, in this case 42, engaging the
rear wall 52 of the slot to bias the connector so that the opposite
retention projection 50 engages in the notch 22 to firmly hold the
connector in position. The other resilient arm 44 extends from the
side of the housing and serves as the test point. The end contact
48 engages the surface pad 14 of the circuit board 12 while
terminal pin 40 depends through an aperture 28 of chassis 26 for
appropriate engagement with plugs, wire wrapping, soldered and
other available connections.
It should be here noted that all four embodiments of the subject
connector are stamped from flat stock and used in edge wise
orientation which gives maximum stiffness for a given material
thickness. Only the first embodiment, as noted above, is stamped
from premilled stock in order to have sufficient thickness to form
the terminal pin.
The second embodiment of the subject connector 54, see FIGS. 5 to
8, is symmetrical and therefor is mounted in the housing 10 aligned
in a single direction. The connector 54 includes a body portion 56,
a plurality of legs 58, 60, 62 and 64 depending from the bottom of
the body portion, retention projections 66 extending from opposite
sides of the body 56, and contact arm 68 extending upwardly from
the body and carrying a contact portion 70 thereon. A flat spring
arm 72 extends from leg 64 to project out of the housing 16 and
serve as a test point. Retention of the connector in the housing is
accomplished by projections 66 on each side of the connector body
56 engaging the opposing walls 76, 78 of the housing 16.
Separate terminal posts 74 are fixedly mounted in alternate
apertures 28 of the chassis 26. The face portions of the legs 58,
60, 62, 64 contacting the terminal posts 74 have coined edges to
assure flat to flat mating between terminal posts and connector
legs even though the connector 54 is obliquely positioned in the
housing as shown in FIG. 8. The legs which engage the terminal post
behave as cantilever springs while the contact arm 68 engaging the
electronic module pad 14 functions as a simple beam with fixed
ends. In this manner forces consistent with the use of non-noble
plating may be obtained in compact form.
The connector slots 20 in the molded plastic housing assure proper
orientation of all of the interengaging elements. Since the slots
are positioned on an angle with respect to the major axis of the
housing, the legs of the contacts are positioned so that one pair
will engage the associated terminal pin.
The third embodiment 80 of the present invention is similar to the
second embodiment in that it is intended for use with terminal pins
74 fixed in the chassis 26. This embodiment includes a contact body
82 having at least two pairs of depending legs 84, 86, 88, 90 and
an oppositely directed stud 92 having laterally extending retention
projections 94. A folded cantilever beam 96 depends from one end of
the connector body 82 in the manner of arm 46 of the first
embodiment. This beam extends upwardly and inwardly with respect to
the housing so that a contact projection 98 on the free end thereof
engages a pad 14 on the side edge of the circuit board 12. The
cantilever beam 96 also has an edge portion 100 which projects
through the side wall of the housing to provide a test access
point.
The faces of the legs 84, 86, 88 and 90 which contact the terminal
posts 74 have coined edges to assure flat mating between post and
connector even though the connector is obliquely positioned in its
housing, as shown in FIG. 12. The members which engage the terminal
post behave as conventional cantilever springs while the beam
engaging the edge pad functions as a heavy recurved cantilever
fixed to the main body of the connector. In this manner forces
consistent with the use of non-noble platings may be obtained in
compact form. The connector is mounted in the housing by inserting
stud 92 into a corresponding recess 102 in the housing 16. The
molded plastic housing assures proper orientation of all of the
interconnecting elements even with the contact cavities positioned
on an angle with respect to the major axis of the housing.
The fourth embodiment 104 of the subject connector is designed for
making surface to surface connection between the circuit board 12
and a printed circuit 106 on chassis 26. This connector is formed
from flat stock and has a body portion 108 with a pair of
cantilever arms 110, 112 extending therefrom. Each arm has a folded
configuration with a contact portion 114, 116, respectively
engaging the associated circuitry. The arm 112 has an extension 118
which will project from a side of the housing to provide test
access. This surface to surface connector uses a flat blank contact
to resiliently connect between two opposite parallel pads of an
electronic element and printed circuit substrate. Thus the modified
cantilever springs of this contact can furnish forces which would
be consistent with non-noble surface coatings used in electrical
applications.
The present invention is subject to many modifications and
variations without departing from the spirit or essential
characteristics thereof. The above described embodiments are
therefore to be considered in all respects as being illustrative
and not restrictive of the scope of the invention.
* * * * *