U.S. patent number 3,665,370 [Application Number 05/113,421] was granted by the patent office on 1972-05-23 for zero-insertion force connector.
This patent grant is currently assigned to AMP Incorporated. Invention is credited to Karl Wilhelm Hartmann.
United States Patent |
3,665,370 |
Hartmann |
May 23, 1972 |
ZERO-INSERTION FORCE CONNECTOR
Abstract
The disclosure relates to a cam actuated ceramic substrate edge
connector or the like. The connector has a cavity in one wall for
receiving the substrate edge. Located on either side of the
inserted substrate edge within the cavity are rocker member
actuated electrically conductive leaf spring contacts movable from
a first position offering zero-insertion force of the substrate
edge to a second position of electrical engagement with circuitry
located on opposite substrate surfaces. An elongated cam member
pivots from a first position to a second position to actuate the
rocker members.
Inventors: |
Hartmann; Karl Wilhelm (Camp
Hill, PA) |
Assignee: |
AMP Incorporated (Harrisburg,
PA)
|
Family
ID: |
22349307 |
Appl.
No.: |
05/113,421 |
Filed: |
February 8, 1971 |
Current U.S.
Class: |
439/260;
439/635 |
Current CPC
Class: |
H01R
12/88 (20130101) |
Current International
Class: |
H01R
12/16 (20060101); H01R 12/00 (20060101); H01r
013/54 () |
Field of
Search: |
;339/74,75,176 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: McGlynn; Joseph H.
Claims
What is claimed is:
1. A zero-insertion force connector for receiving a printed circuit
board or ceramic substrate edge or the like and making electrical
contact with electronic circuitry thereon, said connector
comprising an elongated housing of generally rectangular box-like
configuration including top, bottom, side and end walls, said
housing having a cavity communicating with said top wall, said
bottom wall including dielectric material and having a plurality of
contact members arranged in a first longitudinal row and extending
generally normally therethrough and each including a terminal
portion extending exteriorly of said wall and a leaf spring contact
portion extending interiorly into said cavity generally toward said
top wall and including a contact surface, a first elongated
comb-like rocker member extending the length of said first
longitudinal row of contact members and having an elongated
cylindrical surface located on a first side and extending the
length thereof, said cylindrical surface being in pivotal
engagement with one of said sidewalls, the tooth portions of said
comb-like rocker member being located below said cylindrical
surface with each tooth extending generally toward said bottom wall
and between and separating adjacent contact members, the upper
portion of said rocker member having an elongated notch located on
a second side opposite to said first side and generally parallel
with said cylindrical surface, said notch receiving the free ends
of said leaf spring contact portions, an elongated cam member
extending the length of said cavity from end wall to end wall and
being parallel with said first row of contact members, said cam
member having elongated raised surfaces on opposite sides thereof,
said cam member being rotatable from a first position wherein said
raised surfaces are out of contact with said tooth portions to a
second position wherein said raised surfaces are in contact with
said tooth portions and cause said rocker member to pivot about
said cylindrical surface and move said leaf spring contact portions
into electrical engagement with respective circuitry on a circuit
board or ceramic substrate inserted into said cavity while said cam
member was in the said first position.
2. A connector as set forth in claim 1 wherein a second
longitudinal row of contact members are arranged in the bottom wall
in parallel, spaced, mirror-image fashion to said first
longitudinal row, a second elongated comb-like rocker member
extending the length of said second longitudinal row of contact
members and having an elongated cylindrical surface located on a
first side and extending the length thereof and being in pivotal
engagement with the other of said sidewalls, tooth portions of said
second comb-like rocker member being located below said second
mentioned cylindrical surface with each tooth extending generally
toward said bottom wall and between and separating adjacent contact
members, the upper portion of said second rocker member having an
elongated notch located on a second side opposite said first side
and generally parallel with said second mentioned cylindrical
surface, said notch receiving the free ends of leaf spring contact
portions of said second row of contact members, said tooth portions
of said second rocker member being in operative engagement with
said cam member in the same manner but on the opposite side thereof
as said tooth portions of said first rocker member, said second
rocker member being pivoted about said second mentioned cylindrical
surface as said cam member is rotated from said first position to
said second position with said leaf spring contact portions of said
second row of contact members being urged toward said leaf spring
contact portions of said first row of contact members.
3. A zero-insertion force connector for receiving a circuit board
insertable along a plane of insertion, said connector comprising a
housing having a top, bottom, side and end walls with said side
walls being parallel to and spaced equidistant on opposite sides of
said plane, a plurality of electrically conductive contact members
extending through said bottom wall in each of two rows parallel to
and spaced on opposite sides of said plane with leaf spring contact
portions extending toward said plane with the free ends thereof
extending away from said plane, said bottom wall including
dielectric material electrically insulating each contact from the
rest and from the housing, upstanding support means located
equidistantly on opposite sides of said plane, each said support
means pivotally supporting a rocker member on each side of and
equidistantly from said plane, each rocker member includes a
generally upstanding portion in abutting engagement with said free
ends and including downwardly extending means in engagement with
rotatable cam member, the axis of rotation of said cam member lying
in said plane, said cam member being rotatable from said rocker
members being pivotal from, and said leaf spring contact portions
being movable from a first position wherein said contact portions
in one row are spaced a greater distance apart from those in the
second row than the thickness of a circuit board inserted in
between said two rows to a second position wherein said cam member
pivots said rocker member to a second position thereby moving said
contact portions to a second position of electrical engagement with
electrical circuitry or said inserted circuit board.
4. A connector as set forth in claim 3 wherein said cam member has
means at one end thereof to aid in effecting rotation of said cam
member, and stop means at the other end thereof for limiting
rotation of said cam member to an arc of approximately 90.degree..
Description
BACKGROUND OF THE INVENTION
Zero-insertion force connectors to date have been relatively
expensive to manufacture due to the relatively high number of parts
involved and, in some instances, close tolerance parts requiring
expensive manufacturing processes such as machining. Other such
connectors have intricate actuating mechanisms and generally two
actuating members, one for each side of the circuit board or
substrate.
It is therefore an objective of the present invention to provide a
relatively inexpensive zero-insertion force connector having a
relatively few number of parts.
It is a further object of the invention to provide a connector
having a single actuator for actuating two opposing rows of
contacts.
It is still another object of the invention to provide a connector
of small compact size and configuration allowing for high density
package of electronic components.
SUMMARY OF THE INVENTION
The above objects are carried out by providing a connector of
generally rectangular box-like configuration having a circuit board
or substrate receiving cavity in the top wall. Located to either
side of the plane of insertion of the circuit board is a row of
electrically conductive leaf spring contacts with the free ends in
engagement with the upper end of a respective rocker member located
on each side of the plane of insertion. The lower end of each
rocker member is in engagement with an elongated cam member whose
axis is in the plane of insertion. Rotation of the cam member
forces the leaf spring contact portions against circuitry located
on the two faces of the inserted board or substrate.
Other objects and attainments of the present invention will become
apparent to those skilled in the art upon a reading of the
following detailed description when taken in conjunction with the
drawings in which there is shown and described an illustrative
embodiment of the invention; it is to be understood, however, that
this embodiment is not intended to be exhaustive nor limiting of
the invention but is given for purposes of illustration and
principles thereof and the manner of applying it in practical use
so that they may modify in various forms, each as may be best
suited to the conditions of a particular use.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of the invention prior to insertion of
a circuit board;
FIG. 2 is an exploded perspective view of the invention;
FIG. 3 is a section view along line A--A of FIG. 1 showing the
position of the movable parts allowing zero-insertion force;
FIG. 4 is a section view taken along line A--A of FIG. 1 but
showing the circuit board inserted into position within the
connector but prior to moving the leaf springs against the circuit
board; and
FIG. 5 is a section view taken along line A--A of FIG. 1 but
showing the circuit board in position with the leaf spring contacts
in electrical engagement with circuitry on the circuit board.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to the drawings there is shown the connector 10 of
the preferred embodiment. The connector 10 comprises a generally
rectangular box-like housing 12, preferably of metal construction,
having top 14, side 16, and end walls 18. Bottom wall 20 (see FIGS.
3 - 5) is formed primarily by dielectric carrier members 22, 24,
each carrying a row of 25 electrically conductive contact members
26. The number of contacts 26 may be varied to suit a particular
application. The carrier members 22, 24 are identical and
oppositely disposed with each having mating tongues 28 and grooves
30. The tongues 28 and grooves 30 are intermated and the two
carrier members 22, 24 with respective contacts 26 are cemented or
otherwise bonded in position in FIGS. 1 and 3 - 5. With sidewalls
16 and end walls 18 the upper surfaces 32 of carrier members 22, 24
form an elongated cavity C generally symmetrical about a plane of
insertion 34. Each row of contacts 26 is spaced equidistant from
plane 34.
Contact members 26 are all identical and each include a lead end 36
suitable for wire wrap, solder, mother circuit board, or other
appropriate electrical connection with external circuitry. Contact
members 26 are slightly offset as at 38 to facilitate or aid in
retention within molded carrier members 22, 24. The contact members
26 are bent inwardly at 40 toward plane 34 and then reverse curved
outwardly near the end portions to form a leaf spring contact
portion 42 for electrical engagement with circuitry 44 of a circuit
board 46.
Located in cavity C adjacent each sidewall 16 is an elongated
comb-like rocker member 48. Each rocker member 48 has an elongated
generally cylindrical surface 50 located on a first side 51 thereof
and is in pivotal engagement by means of cylindrical extensions 52
with respective upstanding supports 53. The opposite or second side
54 of rocker member 48 on the upper end thereof has an elongated
groove or notch 56 within which the free ends 58 of leaf spring
contacts portions 42 abut. The lower end of comb-like rocker member
48 is comprised of a plurality of tooth-like members 60 of a number
one less than the number of contact members 26 with each tooth
between and separating adjacent contact members 26. The second side
54 of each tooth 60 is in engagement with an elongated rotatable
cam bar or member 62 whose axis of rotation lies in plane 34.
Cam member 62 is of generally cylindrical configuration with
elongated flat surfaces 64 thereon which, at the intersection with
the cylindrical surfaces form cams 66. Upon rotation of said cam
member 62 from a first position (FIGS. 3 and 4) generally
90.degree. or less to a second position (FIG. 5) the cams 66
displace the tooth-like members 60 thus pivoting each rocker member
on respective supports 53 with cylindrical surface 50 reacting
against the respective sidewall 16 causing said contact portions 42
to be displaced toward each other.
While the cam member is in the first position (FIGS. 3 and 4) the
circuit board 46 is inserted between the two rows of contacts 26
(FIG. 4). As seen there is space between the contact portions 42,
42 greater than the thickness of board 46 and circuitry 44 thus
allowing a zero-insertion force. After the board 46 is in position
(FIG. 4) the cam member 62 is rotated forcing contact portions 42
against respective circuitry 44 on the board 46 (FIG. 5).
Cam bar 62 has located at each end 68, 70 cylindrical bearing
members 72 which are contained by journal segments 74, 76 located
in end walls 18 and end portions of carrier members 22, 24,
respectively. Located at one end 68 of cam member 62 is a slot 78
for receiving a screw driver or like tool to effect rotation of the
cam member 62. Located at the opposite end 70 is a bar 80 which
extends transversely of the bearing 72 through the axis thereof and
acts as a stop member by abutting stop surface 82 during counter
clockwise rotation (FIGS. 1 and 2) of cam member 62 and by abutting
stop surface 84 during clockwise rotation of cam member 62. Thus
rotation of cam member 62 is limited to an arc of approximately
90.degree. .
Flanges 86, 86 having apertures 88 therein, are extension of top
wall 14 and facilitate securing of the circuit board 46 to the
housing by means of a mating flange (not shown) carried by the
board 46.
It will, therefore, be appreciated that the aforementioned and
other desirable objects have been achieved; however, it should be
emphasized that the particular embodiment of the invention, which
is shown and described herein is intended as merely illustrative
and not as restrictive of the invention.
* * * * *