U.S. patent number 3,848,222 [Application Number 05/380,316] was granted by the patent office on 1974-11-12 for zero entry connector system.
This patent grant is currently assigned to AMP Incorporated. Invention is credited to Linn Stephen Lightner.
United States Patent |
3,848,222 |
Lightner |
November 12, 1974 |
ZERO ENTRY CONNECTOR SYSTEM
Abstract
A zero entry connector system is disclosed having male and
female connectors which require very small force for mating. One of
the connectors is provided with a camming means which acts on the
other connector to effect a relative transverse motion therebetween
to bring the contacts therein into mating engagement. Each contact
of one member is the active contact and has the form of a resilient
leaf while each contact of the other portion is the passive contact
and has the form of a fixed and relatively rigid pin. The male and
female connectors are mated in the conventional manner but no
engagement of the contacts occurs until after the connectors have
been fully mated and then moved transversely with respect to one
another by the camming means.
Inventors: |
Lightner; Linn Stephen (Camp
Hill, PA) |
Assignee: |
AMP Incorporated (Harrisburg,
PA)
|
Family
ID: |
23500715 |
Appl.
No.: |
05/380,316 |
Filed: |
July 18, 1973 |
Current U.S.
Class: |
439/342;
439/372 |
Current CPC
Class: |
H01R
13/193 (20130101) |
Current International
Class: |
H01R
13/02 (20060101); H01R 13/193 (20060101); H01r
013/54 () |
Field of
Search: |
;339/74,75,103,184 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: McGlynn; Joseph H.
Claims
What is claimed is:
1. A low entry force electrical connector system comprising:
a first connector member having a plurality of passive contacts,
each said passive contact having a contacting surface and being
secured in individual bores in said first connector member;
a second mating connector member having a like plurality of active
contacts, each of said active contacts being secured in individual
bores in said second connector member and having a contacting
surface extending from said bores,
each of said active contacts in said second connector member being
associated with a passive contact in said first connector member
and being overlappingly spaced apart from said associated contact
when said connector members are initially mated;
cam means rotatably mounted on one of said contact carrying
connector members and adapted to act directly on the other of said
contact carrying connector members to cause relative transverse
movement between said members,
whereby said connector members are initially mated without said
contacts engaging and said contacts are brought into engagement by
the relative transverse movement resulting from actuating said cam
means.
2. A low entry force electrical connector system according to claim
1 wherein said first connector member is a male member having a
mating face, said passive contacts extending within their
respective bores to a point spaced from said mating face.
3. A low entry force electrical connector system according to claim
1 further comprising polarizing means on said connector members
whereby only one mating position is possible.
4. A low entry force electrical connector system according to claim
1 further comprising
locking means on said connector members, said locking means being
brought into locking engagement by said relative transverse
movement whereby said connector members are secured together.
5. A low entry force electrical connector system according to claim
1 wherein said second connector member includes a hood extending
from a mating surface of said second connector member about the
periphery thereof whereby connection of said connectors is
polarized and said active contacts are protected when said
connector members are disengaged.
6. A low entry force electrical connector system according to claim
1 further comprising
strain relief means secured to at least one of said connector
members.
7. A low entry force electrical connector system according to claim
1 further comprising
cam travel limit means on said one of said connector members
limiting the rotational movement of said cam means.
8. A low entry force electrical connector system according to claim
1 further comprising
latching means to releasably secure said cam means in said one of
said connector members, and
a cam surface on said cam means adapted to release said latching
means.
9. A low entry force electrical connector system according to claim
1 wherein each said passive contact is a rigid pin fixedly mounted
in said first connector member.
10. A low entry force electrical connector system according to
claim 1 wherein each said active contact includes
a connection portion adapted to be secured to an electrical lead,
and
a resilient blade portion having a contact surface on a free end
thereof.
11. A low entry force electrical connector system according to
claim 1 wherein
said cam means is mounted on one of said connector members adjacent
one end thereof, and
cam reactor surface means formed on one end of the other of said
connector members for cooperative reaction with said cam means to
cause said relative transverse movement between said connector
members.
12. A low entry force electrical connector system according to
claim 11 wherein said cam means includes a cam surface adapted to
bear against said cam reactor surface, and
latching means adapted to lockingly engage one side of said cam
reactor surface to prevent separation of said connector members
when said contacts are engaged.
13. A low entry force electrical connector system according to
claim 11 further comprising locking means at the other end of each
of said connector members, said locking means being brought into
locking engagement by said relative transverse movement.
14. A low entry force electrical connector system according to
claim 13 wherein said locking means comprises
a recess in one of said connector members defining an angular
shoulder, and
a flange on the other of said connector members defining a
cooperating angular shoulder.
15. A low entry force electrical connector system according to
claim 1 wherein said cam travel limit means comprises first and
second fixed limit stops.
16. A low entry force electrical connector system according to
claim 15 wherein said stops are spaced apart a distance defining a
quarter of a turn of said cam means.
17. A low entry force electrical connector system comprising
a first connector member having a plurality of active contacts
therein, each of said active contacts being secured in individual
bores in said first connector member and having a resilient blade
portion projecting from a mating face of said first connector
member in cantilever fashion;
a second connector member having a like plurality of passive
contacts therein, each of said passive contacts comprising a rigid
pin fixedly secured within individual bores in said second
connector member; and
cam means rotatably mounted on one end of one said contact carrying
connector members and adapted to act directly on the like end of
the other of said contact carrying connector members to effect
relative transverse movement therebetween, whereby said connector
members are initially mated without said contacts engaging and said
realtive transverse movement brings said contacts into
engagement.
18. A low entry force electrical connector system according to
claim 17 wherein said second connector member is a male member
having a mating face, said passive contacts extending within their
respective bores to a point spaced from said mating face.
19. A low entry force electrical connector system according to
claim 17 further comprising
polarizing means on said connector members whereby only one mating
position is possible.
20. A low entry force electrical connector system according to
claim 17 further comprising
locking means on said connector members, said locking means being
brought into locking engagement by said relative transverse
movement whereby said connector members are secured together.
21. A low entry force electrical connector system according to
claim 17 wherein said first connector member includes a hood
extending from the mating surface and about the periphery thereof
whereby mating of said connectors is polarized and said active
contacts are protected when said connector members are
disengaged.
22. A low entry force electrical connector system according to
claim 17 further comprising
strain relief means secured to at least one of said connector
members.
23. A low entry force electrical connector system according to
claim 17 further comprising
cam travel limit means on said one of said connector members
limiting the rotation movement of said cam means, said cam travel
limit means comprising first and second fixed limit stops, spaced
apart a distance defining a quarter of a turn of said cam
means.
24. A low entry force electrical connector system according to
claim 17 further comprising
latching means adapted to releasably secure said cam means in said
one of said connector members, and
a cam surface on said cam means adapted to release said latching
means.
25. A low entry force electrical connector system according to
claim 17 wherein each said active contact includes
a connection portion adapted to be secured to an electrical lead,
and
a resilient blade portion having a contact surface on a free end
thereof.
26. A low entry force electrical connector system according to
claim 17 further comprising
cam reactor surface means formed on said like end of the other of
said connector members for cooperative reaction with said cam means
to cause said relative transverse movement between said connector
members.
27. A low entry force electrical connector system according to
claim 26, wherein said cam means includes a cam surface adapted to
bear against said cam reactor surface, and
latching means adapted to lockingly engage one side of said cam
reactor surface to prevent separation of said connector members
when said contacts are engaged.
28. A low entry force electrical connector system according to
claim 26 further comprising locking means at the other end of each
of said connector members, said locking means being brought into
locking engagement by said relative transverse movement.
29. A low entry force electrical connector system according to
claim 28 wherein said locking means comprises
a recess in one of said connector members defining an angular
shoulder, and
a flange on the other of said connector members defining a
cooperating angular shoulder.
Description
BACKGROUND OF THE INVENTION
1. The Field Of The Invention
The present invention relates to a zero entry connector system and
in particular to a connector system in which a plurality of
contacts are engaged by first bringing together male and female
members of the system with substantially no force since the
contacts are not engaged and then moving the members transversely
with respect to one another to bring the respective contacts into
full engagement.
2. The Prior Art
Most of the well known electrical connectors require the exertion
of a certain amount of force to accomplish insertion and extraction
of a moveable contact element or elements, which force is dependent
upon the number of contacts to be mated. Whether the connector is
of a single or multiple type, the force required is inherent in the
mating and unmating operations due to friction and the resilient
pressure employed to assure good contact between the respective
contacts or terminals. Such force is of relatively small importance
with jacks employing only a few contacts or terminals, but becomes
rather considerable when a great multiplicity of contacts are
involved. In such case, the force required to engage or separate
the connector parts may become a problem of considerable portions.
For this reason many efforts have been made in the direction of
providing a so called zero force connector system which requires
little force for connection or extraction of the connector
components.
One attempt to provide a low insertion force connector can be found
in U.S. Pat. No. 3,173,734. In this example, the contacts are
formed by two members which engage in a wiping manner thereby
producing relatively low insertion force requirements.
Another type of low insertion force connector is the patch cord
type connector, see U.S. Pat. No. 3,419,842, in which a fixed panel
having a number of contacts associated therewith is joined to an
associated circuit by first bringing two panels into relative
position with respect to one another by a hangar arrangement,
closing the panels together and then effecting a cam operation to
cause vertical and horizontal displacement of the contacts of the
moveable panel with respect to the fixed panel contacts. This
causes a wiping movement of the contacts assuring good electrical
connection therebetween. However, such patch cord arrangements are
relatively bulky, heavy and rather cumbersome to use.
Still another type of low insertion force connector is represented
by U.S. Pat Nos. 3,553,630 and 3,670,288. Both of these patents
disclose connectors in which a torsion force is applied to one
member of the connector twisting it such that contacts therein
engage contacts of a mated member.
A further example of a low insertion force connector is the
position-and-lock jack disclosed in U.S. Pat. No. 3,145,067. This
jack system includes two portions which can be mated with
substantially no insertion force and then cammed relative to each
other by camming means 29. However, this system suffers from the
defect that there is a great deal of effort required to properly
align the jack portions for final mating as well as the possibility
of breaking off the male contact or even effecting improper initial
mating since there is no adequate guide for the jack members.
U.S. Pat. Nos. 3,315,212 and 3,594,698 disclose connector
arrangements in which contacts carried by first and second mating
block members are moved relative to one another by means of an
intermediate third block which is cammed transversely with respect
to the other two block portions. Both of these arrangements are
rather complex in nature and have a substantial number of parts
which greatly increases the production costs and assembly
requirements.
SUMMARY OF THE INVENTION
The subject zero entry connector system includes a female connector
and a male connector receivable therein. One of the connectors is
provided with passive contacts and the other connector is provided
with active contacts. The passive contacts are rigid pins fixedly
mounted in the connector while the active contacts have a resilient
blade extending from the connector in cantilever fashion. Cam means
are provided on one of the connectors for effecting relative
transverse movement between the connectors. The connectors are
initially mated in the normal manner without the contacts engaging.
There is substantially no connection force during this initial
mating movement. The connectors are then moved transversely with
respect to one another by the cam means to bring the contacts into
good electrical and mechanical engagement.
It is therefore an object of the present invention to construct an
economical zero entry connector system that is capable of quickly
and easily mating large numbers of contacts with a simple motion
and to provide positive retention of the engaged connectors.
It is a further object of the present invention to construct a zero
entry connector system which will have little or no wear on the
mating contacts since there is no engagement of the contacts until
after the connectors are fully mated and then moved transversely
relative to one another.
It is a further object of the present invention to construct a zero
entry connector system in which the relative transverse motion of
the connectors causes some wipe and backwipe between the active
(resilient) contact and the passive (rigid) contact to assure good
electrical and mechanical engagement of the contacts.
It is another object of the present invention to construct a zero
entry connector system having a continuous contact pattern that is
unbroken by latching means in the center of the system.
It is still another object of the present invention to construct a
zero entry connector system in which the contact engaging
arrangement makes it possible to have long, low spring rate
contacts and large relative motion between the contacts. This has
the advantage of minimizing force variations that result from the
inherent dimensional variations and can be achieved with only a
very short length of the contact exposed thereby minimizing the
risk of damage.
It is yet another object of the present invention to construct a
zero entry connector system which is capable of use with shielded
systems.
The means for accomplishing the foregoing and other objects of the
present invention will become apparent to those skilled in the art
from the following description with reference to the accompanying
drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a side elevation, partly in section, of the subject zero
entry connector system;
FIG. 2 is an enlarged fragmentary sectional view showing the
subject zero entry connector system mated but not yet latched;
FIG. 3 is an enlarged fragmentary sectional view showing the
subject zero entry connection system mated and latched;
FIG. 4 is a transverse fragmental sectional view taken along line
4--4 of FIG. 2;
FIG. 5 is a transverse sectional view taken along line 5--5 of FIG.
3;
FIG. 6 is a perspective view of the cam latch of the present
invention; and
FIG. 7 is a perspective view, on an enlarged scale, of the active
or resilient contact of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
The subject zero insertion force connector assembly includes a male
or plug connector 10 and a receptacle or a female connector 12. The
male or plug connector 10 is an integral member having a
substantially rectangular mounting portion 14 surrounding a contact
carrying portion 16. The mounting portion 14 has outwardly directed
mounting flanges 18 at opposite ends thereof with openings 20
therein for the passage of bolts or other locking means (not shown)
to secure the plug to a panel or the like (also not shown). At one
end of the contact carrying portion 16 there is a profiled cam
reactor surface 22 which, in this instance, is formed by a first
annular bore 24, a conical counter bore 26 and an intermediate
arcuate portion 28 defining an arcuate shoulder 30 between it and
bore 24. The opposite end of the mounting portion 14 there is a
transverse flange 32. A plurality of contact bores 34 and counter
bores 36 are formed in the contact carrying portion 16. A rigid
connector pin 38 (the passive contact) is fixed in each of the
contact bores 34 with its forward end extending into the counter
bore 36 but not projecting beyond the mating face 40 of the male
connector block. The other end of the pin is connected to an
electrical lead (not shown) by any conventional means.
The receptacle or female connector 12 includes a contact block 42
having an integral, outwardly directed, annular flange 44 and a
strain relief housing 46. The housing is assembled with the block
with annular recess 48 in the housing grippingly engaging flange
44. Screws 50 secure the parts of the housing together to hold
cable 52 therein. The block 42 includes a forwardly directed hood
or annular flange portion 54 which defines a profiled, and
preferably polarized, opening into which the contact carrying
portion 16 is inserted. A plurality of contact bores 56 are formed
in contact block 42 and receive therein a resilient contact 58 (the
active contact). The resilient contact includes a resilient blade
portion 60 which extends beyond the mating face 62 of the contact
block and a connection portion 64 adapted to be fixed to a lead 66
of cable 52 by any conventional means such as crimping. A bead 68
is formed on the free end of blade portion 60. A first bore 70 is
formed towards one end of the contact block 42 with a counter bore
72 in communication therewith. At least one resilient latching
member 74 extends from an edge of the first bore 70 into the
counter bore 72. The latching member 74 includes a latching
projection 76 on the free end thereof directed radially inwardly
with respect to bore 70.
A cam member 78 is mounted in the first bore 70. The cam member 78
includes a first cylindrical portion 80 with a second cylindrical
portion 82 integrally connected to one end thereof forming an
annular shoulder 84 therebetween. A lever 86 is fixedly connected
to the other end of the first cylindrical portion 80. The opposite
end of the second cylindrical portion 82 has an arcuate cam groove
88 formed therein defining a pair of spaced shoulders 90, 92.
Shoulder 88 is normally engaged with the projection 76 of latching
means 74. The free end of the second cylindrical member has a cam
and latching extension 94 formed by a cam surface 96 and a latching
projection 98. A first cam stop 100 is integrally formed on housing
46 at a position where it will be engaged by handle 86. A second
cam stop 102 is integrally formed within counter bore 72. The first
and second cam stops are preferably spaced apart a distance
equalling one quarter turn of the cam member.
A transverse shoulder 104 is formed by a flange 106 or by a recess
(not shown) within the hood 54 at the opposite end of the contact
block 42 from the cam member 78.
The operation of the subject zero entry connector system will be
described with reference to FIGS. 3 to 5. The male connector 10 is
inserted within the hooded opening 54 of the female connector 12 as
shown in FIGS. 2 and 4. This opening is polarized by the location
of the cam member 78 and shoulder 104 in the female connector and
the cam reactor surface 22 and flange 32 on the male connector
thereby preventing mismating of the connectors. It should be noted
that in this initial mating position the rigid contact pins 38 are
not engaged by the blade portion 60 of the resilient contacts 58.
Therefore the only force required to insert the male connector into
the female connector is the force required to overcome the sliding
friction between the mating peripherical surfaces of the connectors
themselves.
When the male and female connectors have been mated, as shown in
FIGS. 2 to 5, and faces 40 and 64 are in contact, the lever 86 of
cam member 78 is rotated to rotate the cam and latching extension
94 from the position shown in FIGS. 2 and 4 to the position as
shown in FIGS. 3 and 5. During this rotation movement, the cam
surface 96 pushes against the arcuate surface 28 causing a relative
transverse movement of the connectors which brings the active
contacts 60 into engagement with the passive contacts 38. The
latching projection 98 also rotates into position behind the
shoulder 30 of the cam reactor surface 22 while transverse flange
32 engages with shoulder 104 to lock the opposite ends of the
connectors together. Thus the present invention is able to achieve
a rapid mating and latching.
The engagement of flange 32 and shoulder 104 serves a further
function, namely, to prevent over travel of the connectors during
the transverse movement. The flange 32 and shoulder 104 limit the
relative transverse movement between the connectors. Thus the
blades 60 of the resilient contacts 58 projecting from the face 62
cannot be damaged by being bent out of position.
The cam member 78 also serves a further function to its polarizing
and relative transverse movement functions. In the position shown
in FIGS. 1, 2 and 5 the cam and latching extension 94 is positioned
to allow insertion of the male connector 10 into the hood 54.
However, if the connectors are not mated and the cam member 78 is
rotated to the latching position shown in FIGS. 3 and 5, then the
cam latching extension 94 will bar entry of the male connector 10
into the hood 54.
The cam groove 88 serves to drive the latching member 74 outwardly
when the cam member 78 is rotated to the latching position (see
FIGS. 2 and 3). This action of the cam groove 88 allows for the
removal of the cam member 78 from the contact block 42 should this
be desired. Of course the cam member cannot be removed when the
connectors are mated since the latching projection 98 would then
engage shoulder 30.
The strain relief housing is shown with the cable entering at an
angle of approximately 45.degree.. It is clear that the entrance
angle of the cable may be changed to any desired angle, the
invention not being limited to a particular angle.
The subject zero insertion force connector system can be applied to
other combinations of connectors than the cable to plate connection
shown, such as cable to cable, etc., since the invention lies in
the way the connection is made rather than the specific entities
being connected.
It is to be understood that the present embodiment is merely
representative and is not to be considered as restrictive or all
inclusive of the invention. Many modifications and changes may be
made without departing from the spirit or essential characteristics
of the present invention.
* * * * *