U.S. patent number 3,614,714 [Application Number 04/878,688] was granted by the patent office on 1971-10-19 for edge connector with polarizing member.
This patent grant is currently assigned to RCA Corporation. Invention is credited to Bernard Silverstein.
United States Patent |
3,614,714 |
Silverstein |
October 19, 1971 |
EDGE CONNECTOR WITH POLARIZING MEMBER
Abstract
A connector having a socket for receiving the leading edge of a
printed circuit board includes a polarizing and keying member
adapted to engage an indexing slot adjacent the printed circuit
board leading edge in a given direction. The engaging
keying-indexing member and slot are disposed in the socket
intermediate the socket bottom and the contact region of a contact
element, permitting the contact element and the indexing-keying
means to be aligned in the given direction.
Inventors: |
Silverstein; Bernard
(Philadelphia, PA) |
Assignee: |
RCA Corporation (N/A)
|
Family
ID: |
25372581 |
Appl.
No.: |
04/878,688 |
Filed: |
November 21, 1969 |
Current U.S.
Class: |
439/633 |
Current CPC
Class: |
H01R
12/7005 (20130101); H01R 13/64 (20130101) |
Current International
Class: |
H01R
13/64 (20060101); H01r 013/64 (); H05k
001/07 () |
Field of
Search: |
;339/17F,17L,17LC,17LM,176MP,176MF,184,186 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Champion; Marvin A.
Assistant Examiner: Staab; Lawrence J.
Claims
What is claimed is:
1. An edge connector for a printed circuit board, said board
including indexing means adjacent an edge thereof, and a plurality
of conductors disposed on a surface of the board, each conductor
terminating adjacent said edge, said connector comprising:
a connector body including keying means adapted to engage said
indexing means in a given direction, said means engaging each other
over a predetermined depth in said direction, and
a corresponding plurality of contact elements extending outwardly
from said body and positioned to register with corresponding ones
of said conductors when the keying and indexing means are engaged,
the contact region between each contact element and the
corresponding conductor being spaced a predetermined distance from
said edge, said distance being greater than said engagement depth
for at least one of said conductors, said one conductor being
aligned with said indexing means in said given direction,
said engagement depth being greater than the maximum displacement
in said given direction between any conductor termination and any
contact region.
2. The connector of claim 1, wherein said connector body includes a
socket for receiving a printed circuit board edgewise therein, the
socket having a bottom wall and a sidewall depending therefrom,
and
said keying means includes a keying member in communication with
said socket intermediate said bottom wall and said contact
region,
said contact elements extending outwardly from said sidewall over
said bottom wall and said keying member such that said contact
region is spaced from said bottom wall a distance greater than said
engagement depth, said contact elements retaining said keying
member in said socket.
3. The connector of claim 2, wherein said sidewall and bottom wall
define a channel and wherein said keying member includes a base
portion and a keying portion, said base portion being disposed
within said channel adjacent said bottom wall, said keying portion
being disposed facing said outwardly extending contact elements in
said given direction, said indexing and keying means including
complimentary male and female portions.
4. The connector of claim 3 wherein said keying portion comprises a
male projection extending into said channel in said given
direction, and
said base portion comprises an elongated member adapted to be
closely received in said channel, said projection extending
therefrom, said base portion being spaced from said contact region
a distance greater than said engagement depth.
5. The connector of claim 2, wherein said bottom wall includes a
recess in communication with said channel, and said keying member
includes a male projection closely received by said recess and
extending from said bottom wall toward said contact region in said
given direction.
6. The connector of claim 2, wherein said keying member includes a
plurality of spaced male projections extending therefrom toward
said contact region in said given direction.
7. The connector of claim 2, wherein said keying member includes a
male projection extending from said bottom wall toward said contact
region.
8. The connector of claim 2, wherein said given direction is
defined by the direction of insertion of said printed circuit board
into said socket.
9. An edge connector for a printed circuit board having indexing
means at an edge thereof and a plurality of conductors disposed on
a surface of the board, each conductor terminating adjacent said
edge, said connector comprising:
a connector body including keying means capable of engaging said
indexing means in a given direction, said means engaging each other
over a predetermined depth in said direction, said indexing and
keying means including complimentary male and female members,
and
a contact element extending outwardly from said body and positioned
to register with at least one corresponding conductor only when the
keying and indexing means are engaged, the contact region between a
contact element and its corresponding conductor being spaced a
predetermined distance from said edge, said distance being greater
than said engagement depth, for at least one of said
conductors,
said engagement depth being greater than the maximum displacement
in said given direction between any conductor termination and the
contact region between said contact element and its corresponding
conductor.
10. An edge connector for a printed circuit board having indexing
means at an edge thereof and a plurality of conductors disposed on
at least one surface of the board, each conductor terminating
adjacent said edge, said connector comprising:
a connector body including keying means adapted to engage said
indexing means in a given direction, said means engaging each other
over a predetermined depth in said direction, and
a plurality of contact fingers secured to said body, each finger
registering with and corresponding to a different one of said
terminating conductors and arranged in overlapping relationship
with its respective corresponding conductor such that each finger
extends over the circuit board a predetermined distance from said
edge when the indexing and keying means are engaged, the contact
region between at least one of said fingers and said conductors
being spaced a distance further from said edge than said engagement
depth,
said engagement depth and the maximum displacement in said given
direction between any conductor termination and any contact region
being related such that each conductor contacts only its
corresponding finger solely when the indexing and keying means are
engaged while none of said conductors contacts any of said fingers
when said indexing and keying means are unengaged.
11. The connector of claim 10, wherein said engagement depth is
greater than the maximum displacement in said given direction
between any conductor termination and any contact region.
12. The connector of claim 10, wherein said connector body defines
an elongated U-shaped channel having a bottom wall and a
sidewall,
each of said contact fingers being secured to said body such that
the contact region thereof communicate with said channel over said
bottom wall,
said keying means includes a keying member secured in said channel
intermediate said bottom wall and said contact region.
13. The connector of claim 12, wherein said bottom wall has a hole
therein; which hole closely receives said keying member, said
keying member including a male keying projection extending from
said member toward said contact region.
14. The connector of claim 10, wherein said connector body defines
an elongated U-shaped channel having a bottom wall and two
sidewalls,
each of said contact fingers being secured to said body such that
the contact region thereof communicates with said channel over said
bottom wall,
said keying means includes a female keying member having a slot
therein parallel to said given direction and communicating with
said channel, said female keying member being adapted to be
received in said channel adjacent one of said sidewalls and said
bottom wall.
15. An edge connector for a printed circuit board, said board
including indexing means adjacent an edge thereof, and a plurality
of conductors disposed on a surface of the board, said connector
comprising:
a connector body having a channel adapted to receive the edge of
said circuit board,
a corresponding plurality of contact elements extending outwardly
from said body toward said channel each element being positioned to
register with a corresponding one of said conductors, and
a keying member disposed in said channel solely between (i) the
contact region between at least one contact element and the
corresponding conductor and (ii) the channel bottom, said keying
member being further disposed at any randomly designated location
intermediate the ends of said channel.
16. An edge connector for a printed circuit board having indexing
means at an edge thereof and a plurality of conductors disposed on
at least one surface of the board, each conductor terminating
adjacent said edge, said connector comprising:
a connector body including keying means adapted to engage said
indexing means in a given direction, said means engaging each other
over a predetermined depth in said direction, and
a plurality of contact fingers secured to said body, each finger
registering with and corresponding to a different one of said
terminating conductors and arranged in overlapping relationship
with its respective corresponding conductor such that each finger
extends over the circuit board a predetermined distance from said
edge when the indexing and keying means are engaged, the contact
region between at least one of said fingers and said conductors
being spaced a distance further from said edge than said engagement
depth,
said engagement depth and the maximum displacement in said given
direction between any conductor termination and any contact region
being related such that each conductor contacts only its
corresponding finger solely when the indexing and keying means are
engaged,
said engagement depth being greater than the maximum displacement
in said given direction between any conductor termination and any
contact region.
17. An edge connector for a printed circuit board having indexing
means at an edge thereof and a plurality of conductors disposed on
at least one surface of the board, each conductor terminating
adjacent said edge, said connector comprising:
a connector body defining an elongated U-shaped channel having a
bottom wall and two sidewalls, said body including keying means
adapted to engage said indexing means in a given direction, said
means engaging each other over a predetermined depth in said
direction, said keying means including a female keying member
having a slot therein parallel to said given direction and being
adapted to be received in said channel adjacent one of said
sidewalls and said bottom wall, and
a plurality of contact fingers secured to said body, each finger
registering with and corresponding to a different one of said
terminated conductors and arranged in overlapping relationship with
its respective corresponding conductor such that each finger
extends over the circuit board a predetermined distance from said
edge when the indexing and keying means are engaged, the contact
region between at least one of said fingers and said conductors
being spaced a distance further from said edge than said engagement
depth, each of said contact fingers being secured to said body such
that the contact region thereof communicates with said channel over
said bottom wall,
said engagement depth and the maximum displacement in said given
direction between any conductor termination and any contact region
being related such that each conductor contacts only its
corresponding finger solely when the indexing and keying means are
engaged.
Description
The present invention relates to means for indexing and keying an
edge connector with respect to a printed circuit board.
Connectors used for printed circuit board applications generally
have a plurality of contact elements secured in elongated sockets
adapted to receive an edge of a printed circuit board. The socket
and circuit board arrangements are such that any one connector is
adapted to receive a plurality of printed circuit boards, each
board having a different circuit arrangement thereon. Consequently,
to prevent mating an incorrect circuit board to a particular
connector, means have been employed for keying a circuit board to a
connector and for polarizing the circuit board to that connector.
When so keyed, the circuit board conductors register with the
connector contact elements only when the board and connector are
coupled in a predetermined arrangement.
These keying means include a variety of configurations, one of
which comprises keying tabs bridging the connector channel and
longitudinally spaced along the channel between adjacent pairs of
opposed contact elements. This arrangement requires keying slots
for these tabs to be preformed into the connector housing
intermediate all of the contact element pairs to permit a keying
tab to be inserted in any desired keying slot or slots. The circuit
board usually has an index slot at an edge thereof adapted to
receive the keying tab when the board is inserted into the
connector in the correct orientation.
Other indexing means include keying members inserted into
connectors adjacent various predetermined contact elements
detachably secured to the contact elements. Another arrangement
includes removing one or more contact elements and substituting a
keying member in the void left by the removed contact element. In
all of these arrangements, the keying member either takes up
valuable contact space adjacent to the contacts, decreasing the
number of possible contacts used in a given length of a connector.
In none of these arrangements, may connectors of the type having
staggered opposed contacts be utilized.
It is an object of the present invention to provide an edge
connector with keying-indexing members which are adaptable for use
with staggered contact connectors and which permit maximum utility
of contact elements in a connector of a given size.
As herein described, an edge connector for a printed circuit board
includes keying means adapted to engage indexing means in the
printed circuit board in a given direction, the indexing and keying
means engage each other over a predetermined depth in the given
direction. Contact elements extending out from the connector body
register with corresponding ones of printed circuit board
conductors when the keying and indexing means are engaged. The
contact region between each contact element and the corresponding
conductor are spaced from the circuit board insertion edge a
predetermined distance, this distance being greater than the
engagement depth for at least one of the conductors. The engagement
depth is greater than the maximum displacement in the given
direction between any conductor termination adjacent an edge of the
circuit board and any contact region.
Further advantages and features of the present invention will be
apparent from the following description taken in conjunction with
the drawings, in which:
FIG. 1 is a plan view of a connector including a keying member
therein, according to a first embodiment of the invention;
FIG. 2 is an elevation view of the connector of FIG. 1 illustrating
the keying member therein;
FIG. 3 is an elevation view illustrating indexing and keying
members for use with the connector of FIG. 2;
FIG. 4 shows an enlarged cross section of the connector of FIG. 2
illustrating a printed circuit board improperly indexed to a keying
member;
FIG. 5 shows a cross section of the connector of FIG. 2
illustrating proper engagement of the indexing and keying
means;
FIG. 6 is an elevation view of a connector having a keying member
according to a second embodiment of the invention;
FIG. 7 shows a cross section of the connector of FIG. 6
illustrating the engaged condition of the indexing and keying
means;
FIG. 8 is an elevation view illustrating a third embodiment of the
invention, and indicating the relationship between the indexing and
keying means; and
FIG. 9 is a perspective view of a connector including indexing and
keying means according to a fourth embodiment of the invention;
FIGS. 10 and 11 are diagrammatic illustrations which are useful in
understanding the principles of the invention.
In FIG. 10, a printed circuit board 140 is shown engaged with
keying member 117. Keying member 117 is seated in the bottom of a
channel in a connector, not shown. Member 117 has a keying
projection 118. Slot or recess 142 of the printed circuit board 140
is engaged with projection 118. Contact fingers 120- 123, mounted
on the connector housing, not shown, overlap and register with
conductors 145- 148, respectively, on board 140. The slot 142 and
projection 118 are engaged a depth x.
Contact region y is the registration area between each of fingers
120- 123 and the corresponding one of conductors 145- 148. Distance
w is the maximum distance in the direction of arrow 195 between the
terminated end t of any conductor and the contact region y between
any contact finger and conductor. In FIG. 10, for example, the
distance w corresponds to the maximum distance between contact
region y of conductor 146 and the terminated edge t of conductor
145. The letter z corresponds to the distance between at least one
contact region y and edge 160 of board 140. For example, in FIG.
10, z corresponds to the distance between contact region y of
conductor 147 and the adjacent edge 160 of the printed circuit
board 140.
In order that recess 142 may be randomly located along edge 160
such that any contact region y of any conductor may be in alignment
above the recess in the direction of arrow 195, the contact region
y for all conductors must be disposed at least a minimum distance z
from the edge 160 of the board. In FIG. 10, as noted, contact
region y of conductor 147 and contact finger 122 are aligned with
recess 142 in the direction of arrow 195. To align any other
contact region y of conductors 145- 148 with a recess such as
recess 142, then distance z is a minimum distance for all the
contact regions of the board. However, when recess 142 is disposed
along edge 160 at a predetermined location such as that of FIG. 10,
then contact region y of conductor 147 only need be located a
minimum distance x from edge 160 of the board 140.
As shown in FIG. 11, when board 140 is shifted in direction of
arrow 197 such that recess 142 and projection 118 are not engaged,
none of the contact fingers 120- 123 are in registration with any
of conductors 145- 148. In this condition, edge 160 of board 140
abuts edge 107 of projection 118 so that the conductors 145- 148
are displaced a distance equal to engageable depth x in the
direction of arrow 195. Thus, none of conductors 145- 148 will
contact any of the contact fingers 120- 123 when recess 142 and
projection 118 are not engaged. By maintaining the relationship
w<x<z, keying member 117 may be disposed in a connector
channel bottom providing maximum contact utilization in a
connector.
FIG. 1 shows a preferred embodiment of a connector 10 having a
plurality of contact elements 20 arranged in staggered opposed
spaced relation. This relation is illustrative only, as other
arrangements will function equally well with the keying and
indexing means to be hereinafter described. In the connector body
13, there is a socket or longitudinal channel 12 which is adapted
to receive a printed circuit board edgewise.
FIG. 2 shows preferred keying member 17 disposed at the bottom of
the channel 12, adjacent bottom wall 11. The keying member 17 may
preferably comprise a rigid insulating material. Keying member 17
includes a base portion 16 which may be an elongated member adapted
to be closely received into channel 12. Extending from base portion
16 are one or more keying projections 18.
As shown in FIGS. 4 and 5, when member 17 is disposed in channel
12, portions 18 extend away from bottom wall 11, and are disposed
intermediate contact region y of connector elements 20 and bottom
wall 11. This arrangement permits the alignment in the direction of
arrow 95 of both the keying portion 18 and a useful contact region
y of contact element 20, which was not possible heretofore.
Keying member 17 of FIGS. 4 and 5 has projection 18 extending
upwardly with respect to bottom wall 11 a distance x which distance
is less from base wall 19 of member 17 than contact region y.
Contact region y is that region which is in contact with conductor
45 of printed circuit board 40 when the board and the connector are
properly engaged.
In FIG. 5, where the respective indexing and keying slots and
members are shown engaged, conductor 45 is in registration with
contact element 20. FIG. 4, however, shows the geometry associated
with improper engagement of the indexing slot 42 to the keying
projection 18. Note that in FIG. 4, edge 60 of board 40 abuts
keying projection 18 at end 7, while in FIG. 5, edge 60 abuts base
wall 19 of keying member 17. The engageable depth x is defined by
the displacement in direction of arrow 95 of edge t of the
conductors when displaced from the position as shown in FIG. 4 to
the position as shown in FIG. 5. Thus, the engageable depth x is,
in this in the length of projection 18 in direction 95. This depth,
of course, will vary according to the particular lengths in
direction 95 of the various indexing and keying means employed as
related to the leading edge of a printed circuit board in the
manner indicated.
Generally, the engageable depth is defined as that maximum distance
the terminations t of printed circuit conductors adjacent a leading
edge of a printed circuit board may be displaced in a given
direction when the associated indexing-keying male and female
members adjacent the leading edge of a printed circuit board and
the respective connector channel are in their respective abutting
proper and improper engaged states. This maximum distance or
engageable depth must be greater than the distance w between any
contact region y and conductor termination of any conductor 45. In
addition, contact region y of any conductor aligned with recess 47
is further from edge 60 than that distance defined by engageable
depth x as indicated above. When these conditions are met, then the
indexing and keying means may be disposed in alignment with the
contact region between any contact element 20 and any conductor 45
without inhibiting the function thereof. By maintaining these
relationships, none of the contact elements will register with any
of the conductors 45 of the printed circuit board except when the
board is correctly inserted in the connector channel.
In the illustrations of FIGS. 1 through 5, the keying member 17 has
been shown to be a separate detachably secured member. In FIGS. 4
and 5, member 17 is disposed below the contact region y. When board
40 is removed from the channel, the contact element resiliently
springs over member 17 retaining the member in the channel.
However, this arrangement is illustrative only, as other variations
could be devised which maintain the relationships described.
One such variation is shown in FIG. 6. In this embodiment, body 50
has a channel 12 similar to that in the connector 10 of FIG. 1.
However, disposed in the bottom wall 52 of the channel are a
plurality of spaced recesses 31 which may be circular holes
extending downwardly from bottom wall 52 of body 50 in the given
direction of arrow 95. Each of recesses 31 is adapted to closely
receive a keying projection 30 which may be a conventional pin made
of metal or other rigid material pressed fitted therein.
According to the predetermined keying arrangement of FIG. 6, two
pins 30 are shown, but any combination could be used.
FIG. 7 is an enlarged cross section of the connector of FIG. 6 in
which keying member pin 3o is shown closely received in recess 31.
The pin 30 extends upwardly a distance x from bottom wall 52.
Distance x is the engageable depth between recess 42 of printed
circuit board 40 and pin 30. Note the clearance space 71 between
the upper end of pin 30 and the surface 75 of recess 42, caused by
edge 60 of the circuit board abutting base wall 52. In this case,
engageable depth x is determined by the upwardly extending position
49 of pin 30. Contact region y of FIG. 7 is shown spaced above
bottom wall 52 the distance z defined above. In addition, distance
w between terminated edge t of conductor 45 and contact region y is
less than the engageable depth x, also as defined above.
In FIG. 8, another variation is shown. Connector 41 of FIG. 8 has a
keying projection or male member 70 extending upwardly from the
bottom wall 31 thereof. Tab 70 is equivalent to keying projection
18 of FIGS. 1 - 5. Contact elements 20 and conductor 45 each have a
contact region y spaced from the keying member 70 and indexing slot
42, respectively, by a distance d. The keying member 70 is adapted
to engage indexing slot 42 of the printed circuit board 40 in
direction of arrow 95. The engageable depth between indexing slot
42 and keying member 70 is distance x, x being that engageable
distance in the given direction of arrow 95. Each contact region y
of any conductor 45 on the printed circuit board 50 is spaced in
the given direction a predetermined distance w to an edge t of any
conductor 45 which terminates adjacent the leading edge 60 of the
printed circuit board 40. Again, this distance w is less than
engageable depth x, and, contact region y on the circuit board is
spaced from the leading edge 60 of the circuit board the distance
z. This distance z, the sum of distances d and x, is greater than
the engageable depth x for all contact regions y since, in this
case, all contact regions y of the conductors lie along the same
line equidistant from the edge 60.
Keying member 70 of FIG. 8 terminates at end 7 a distance
intermediate contact region y and the bottom wall 31. Further,
keying member 70, as are the keying projections of the
above-described embodiments, may be disposed along longitudinal
axis a of the channel regardless of the longitudinal position A of
any contact element. As shown, keying member 70 may occupy any
space along the longitudinal a axis in alignment with contact
region y of any element 20 in the direction of arrow 95.
By disposing keying members adjacent to a bottom wall 11, 52 or 31
of the channel 12 of the connectors of FIGS. 2, 6, and 8,
respectively, and intermediate contact region y of the contact
region y of any element 20 in the direction of arrow 95.
By disposing keying members adjacent to a bottom wall 11, 52 or 31
of the channel 12 of the connectors of FIGS. 2, 6, and 8,
respectively, and intermediate contact region y of the contact
elements and the bottom wall, loss of utilization of any contact
element is avoided, and, in addition, maximum utility of the
longitudinal spacing of contact elements is ensured. Thus, greater
flexibility and increased contact element density can be provided
while maintaining maximum circuit protection.
As shown in FIG. 9, a fourth embodiment includes a keying member
such as elongated female member 97 having a slot 96, and indexing
male member, such as stud 95. In this case, the engageable depth is
the maximum displacement of edge t of the conductors 45 of board 65
in direction of arrow 95 when stud 95 abuts surface 98 of member 97
in the improper keyed state and when stud 95 is inserted in slot 96
in the proper state. In any case, the keying member, whether male
or female, may be permanently or detachably secured to the
connector adjacent the bottom channel wall thereof.
* * * * *