U.S. patent number 3,901,575 [Application Number 05/458,618] was granted by the patent office on 1975-08-26 for plug for patch systems.
This patent grant is currently assigned to AMP Incorporated. Invention is credited to Charles Donald Hoover.
United States Patent |
3,901,575 |
Hoover |
August 26, 1975 |
Plug for patch systems
Abstract
An improved plug is disclosed for use in a patch system in which
plugs and receptacles are arranged in a high density fashion. The
plugs can be formed individually or in gang fashion and are
arranged to be positively latched in the associated receptacles.
The plugs are polarized and include integral springs formed of the
same plastics material as the plugs. The plugs can also be provided
with a detent which allows the plugs to be mechanically held in the
receptacles prior to making electrical engagement.
Inventors: |
Hoover; Charles Donald
(Harrisburg, PA) |
Assignee: |
AMP Incorporated (Harrisburg,
PA)
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Family
ID: |
27024373 |
Appl.
No.: |
05/458,618 |
Filed: |
April 8, 1974 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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419167 |
Nov 26, 1973 |
3874763 |
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Current U.S.
Class: |
439/342;
439/748 |
Current CPC
Class: |
H01R
13/6272 (20130101); H01R 13/50 (20130101) |
Current International
Class: |
H01R
13/627 (20060101); H01R 13/50 (20060101); H01R
013/54 () |
Field of
Search: |
;339/91,184,186,217 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: McGlynn; Joseph H.
Attorney, Agent or Firm: Egan, Esq.; Russell J.
Parent Case Text
CROSS REFERENCE TO RELATED APPLICATION
The present application is a continuation-in-part of my application
Ser. No. 419,167 filed Nov. 26, 1973, now U.S. Pat. No. 3,874,763.
Claims
What is claimed is:
1. A plug for use in high density patch systems having a receptacle
portion with a plurality of closely spaced polarized cavities
therein, said plug comprising:
a substantially rectangular plug member having a polarized
transverse profile adapted to mate with said cavities, a
longitudinal passage through said plug, a locking lance extending
laterally outwardly from one longitudinal side of said plug, a
spring member extending in parallel spaced relation longitudinally
along the opposite side of said plug with both ends of said spring
member integrally connected to said plug member, said spring being
deformed during insertion of said plug member into said receptacle
portion and biasing said locking lance into full latching
engagement in said receptacle portion when said plug is fully
inserted therein, and detent means at a forward end of said plug
spaced from said locking lance whereby said plug is inserted in two
steps with said detent means providing only mechanical latching in
said receptacle portion.
2. A plug according to claim 1 wherein said plug is a unitary
member of molded plastics material.
3. A plug according to claim 1 wherein said plug further includes
an aperture on a third side of said plug, and
a female socket contact mounted in said passage and including
locking lance means extending into said aperture to fix said
contact in said passage, means for fixing said contact to a
conductor, and male terminal contact receiving means.
4. A plug according to claim 1 further comprising:
a plurality of said plugs having integral intermediate webs between
adjacent pairs of plugs, whereby said plugs are interconnected in
gang fashion.
5. A plug according to claim 4 wherein at least one plug of said
gang of plugs has a locking lance.
6. A high density pluggable patch system comprising:
a receptacle member having a plurality of closely spaced polarized
cavities, aperture means interconnecting adjacent pairs of
cavities;
a male terminal contact fixedly mounted in each said cavity;
at least one substantially rectangular plug member adapted to be
inserted into any cavity of said receptacle member, said plug
member having a transverse profile mating with said polarized
cavities, locking lance means extending from one side of said plug,
spring means extending in parallel spaced relation longitudinally
along an opposite side of said plug with both ends of said spring
means integrally connected to said plug, a longitudinal passage
through said plug, an aperture in said plug leading to said passage
and detent means on said plug member spaced forwardly of said
locking lance means; and
a female receptacle contact adapted to be mounted in said passage
in said plug and to receive said male terminal contact therein,
said female contact including locking lance means extending into
said aperture to fix said female contact in said passage,
said detent means being adapted to first fixedly engage said plug
member in said receptacle in mechanical engagement without the
electrical contacts being engaged,
said spring means being deformed during insertion of said plug
member into said cavity and biasing said locking lance into
latching engagement with said cavity aperture when said plug member
is fully inserted into said cavity.
7. A high density pluggable patch system according to claim 6
wherein said receptacle member comprises:
a plurality of receptacle units, each unit having a plurality of
polarized cavities therein and means for joining said units
together in an array.
8. A high density pluggable patch system according to claim 6
wherein said male terminal contact has a tapered pin and adapted to
mate with said female receptacle contact, locking lance means for
fixedly mounting said terminal in said cavity, and means for
connecting conductors to said terminal.
9. A high density pluggable patch system according to claim 6
wherein said plug member further includes an aperture formed in a
third side of said plug member, and
said female receptacle contact further includes locking lance means
adapted to engage said aperture of said plug member.
10. A high density pluggable patch system according to claim 6
wherein said female receptacle contact includes:
means for connecting said contact to an associated conductor,
and
receptacle means comprising a channel shaped portion having a base
pair and a pair of parallel spaced sidewalls,
cantilever leaf spring means attached to one of said sidewalls and
overlying said channel shaped portion, said leaf spring converging
towards said base and being reversidly curved toward its free
end,
a hump formed in said base opposite said leaf spring defining a
narrow throat therebetween, and
a backup spring attached to the other of said sidewalls and
overlying said leaf spring.
11. A high density pluggable patch system according to claim 6
further comprising a gang plug unit comprising:
a plurality of plug members and web means fixedly interconnecting
adjacent pairs of plug members in said unit, at least one plug
member having a locking lance and at least one plug member having
detent means at a forward end thereof for initially mechanically
locking said unit in an associated receptacle prior to mating of
said contacts.
12. A high density pluggable patch system according to claim 6
further comprising a gang plug unit comprising a plurality of plug
members and web means interconnecting adjacent pairs of plug
members.
13. A high density pluggable patch system according to claim 12
wherein at least one plug of said gang plug member has a locking
lance.
Description
BACKGROUND OF THE INVENTION
1. The Field of the Invention
The present invention relates to an improved plug for use in high
density patch systems and in particular to a plug of plastics
material utilizing the plastics material as a spring biased
latching and retention means.
2. The Prior Art
In high density pluggable patch systems there is an inherent
problem in providing plugs which will suitably mate with the
receptacles and yet can be readily removed for replacement and/or
exchange purposes. The high density arrangement limits the amount
of material that can be used in the plugs as well as to the number
of configurations which can be used. It is clear that plugs for
high density applications can not utilize extraneous springs or
complicated latching arrangements since they would necessarily
require a great amount of space which is not normally
available.
Many attempts have been made to solve the above problem, however,
most of them have relied upon the formation of the contact itself
to give the necessary spring force for latching. While this may be
suitable for some applications, it is not always possible since
contacts with high spring forces may be subject to an unnecessary
and unacceptable level of wear during normal usage.
There is a frequent requirement that plugs must have the capability
of mechanically fixedly engaging the associated receptacle prior to
electrical engagement of the contacts thereby. This feature is
necessary when it is desired to run all the wires to a terminal
board, for example, before actually cutting in the board to the
associated circuitry. This has previously required the addition of
expensive switching equipment, which is normally used only a very
few times.
SUMMARY OF THE INVENTION
The present invention is an improved plug for use in high density
patch systems in which each receptacle has a polarized entrance.
The plug is formed of a unitary piece of plastics material and has
a polarized transverse section, a locking lance on one lateral side
and a longitudinally extending resilient spring member on an
opposite lateral side. An additional detent can be provided for
mechanically locking the plug in an associated receptacle prior to
electrical engagement of the contacts carried thereby.
It is an object of the present invention to produce an improved
plug for use in high density patch systems in which the plug can be
mated and unmated with closely spaced receptacles with a minimum of
effort and wear on the plug.
It is another object of the present invention to produce a plug for
high density pluggable patch systems in which the plug is molded
plastics material and includes a locking lance on one side and
resilient spring member on the opposite side for biasing the
locking lance toward associated apertures in the receptacle.
It is yet another object of the present invention to produce a plug
for high density pluggable patch systems in which the plug is
capable of two step insertion, one step being a mechanical locking
in the associated receptacle and the second step being a full
mechanical and electrical latched position.
It is a further object of the present invention to produce a plug
for high density patch systems which plug may be readily and
economically produced.
The means for accomplishing the foregoing objects and other
advantages of the present invention will become apparent from the
following detailed description taken with reference to the
accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a high density patch system showing
two multiple plugs according to the present invention, one inserted
into a row of receptacles and a second positioned for insertion
into another row of receptacles.
FIG. 2 is a longitudinal horizontal section taken along line 2--2
of FIG. 3;
FIG. 3 to FIG. 6 are side elevations, partly in section, showing
steps during insertion of the subject plug into an associated
receptacle;
FIG. 7 is an enlarged longitudinal vertical section, similar to
FIG. 5, showing the subject plug partially inserted into the
associated receptacle;
FIG. 8 is an enlarged longitudinal vertical section, similar to
FIG. 6, showing the subject plug fully inserted into the associated
receptacle;
FIG. 9 is an enlarged longitudinal vertical section similar to FIG.
7, showing an alternate embodiment of the subject plug partially
inserted into an associated receptacle; and
FIG. 10 is an enlarged longitudinal vertical section showing the
alternate embodiment of the subject plug fully inserted into the
associated receptacle.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Turning first to FIG. 1, the receptacle portion 10 of a high
density patch system is formed by a plurality of individual
receptacle units 12, 14, 16, 18, and 20. The individual receptacles
are held together in a stacked array by conventional means (not
shown) such as inter-mating projections and recesses. In the case
shown, each of the receptacle units has six polarized cavities 22.
The adjacent cavities 22 are in communication through shaped
apertures 24. The cavities further include a passage 26 through the
unit and a shoulder 28 formed in the passage. A male terminal
contact 30 is mounted in passage 26 with locking lance 32 engaging
the shoulder 28. The male terminal contact shown is of an elongated
post configuration, generally rectangular in cross-section and
provided with a tapered free end. The opposite end of the terminal
is provided with a suitable configuration for receiving connecting
conductors. The male terminal contact can have any desired
configuration suitable for electrically and mechanically engaging a
mating contact.
The subject plug is shown in FIG. 1 as two multiple or gang plug
units 34, each comprising five individual plug members 36 connected
by webs 38. Each plug member 36 includes a profiled unitary body 38
of plastics material having a longitudinal passage 40 for receiving
a female receptacle contact 42. The forward end of the passage 40
has a shaped opening 44 which serves to guide the male terminal
contact into the receptacle contact. A locking lance 46 projects
from one longitudinal side of the plug member and a longitudinally
extending spring 48 is formed on the opposite side of the plug. It
is only necessary for at least one of the plug members in a gang
unit to have a locking lance. On a third side of the plug there is
an aperture 50, shown in FIG. 2.
The illustrated electrically conducting female receptacle contact
42 has a generally box-like receptacle configuration 52 provided
with an open end 54 for receiving therein a male electrical
terminal 30. The female receptacle contact can be fabricated from a
single blank of stamped metal folded to form a generally channel
shaped portion including a bottom wall 56 and two spaced parallel
sidewalls 58, 60. The box-like receptacle configuration is formed
by the channel portion and an elongated electrically conducting
leaf spring contact portion 62 having a free end extending towards
the open end 54 of the contact. The leaf spring 62 is integral with
one sidewall of the channel and is folded about the sidewall to a
position generally overlying the channel portion. The leaf spring
may be provided with a projecting flange portion (not shown) which
engages the opposite sidewall of the channel so that the leaf
spring is fully supported by the channel portion. The elongated
leaf spring contact 62 is preferably reversibly curved along its
length. More specifically, a medial portion of the contact is first
curved at an incline to converge generally towards the bottom of
the wall 56 and the free end 64 of the contact is reversibly
curved, with respect to the medial portion, to provide an outwardly
flaring lip immediately adjacent the open end of the box-like
configuration. The outwardly flared end provides a frontal profile
at the entry which facilitates insertion of the tapered nose of the
male contact. The reversedly curved spring forms an arcuate surface
defining a narrow throat portion internally of the channel portion.
In a similar fashion the bottom wall 56 may be optionally provided
with a dimple 66 opposite the leaf spring contact 62 to further
restrict the relatively narrow throat portion.
The contact is further provided with an elongated helper spring
portion 68 having a generally tapered configuration terminating at
a free end which is pointed away from the open end 54. The helper
spring 68 is integral with a sidewall of the channel and is folded
about the sidewall such that it is in overlying relationship over
the leaf spring contact 62. Accordingly, the helper spring is
integral with one sidewall of the channel portion while the leaf
spring contact is integral with the opposite sidewall of the
channel portion.
The receptacle further includes an integral pair of clamping
flanges 70 which are formed into opposed sidewalls portions and
formed into a U-shaped before being subsequently curled toward one
another to form a crimped barrel connection to a wire conductor 72
as shown. In this manner the receptacle may be securely
electrically and mechanically connected to an electrically
conducting insulated covered wire in a well known manner as taught
by U.S. Pat. No. 2,791,755.
FIGS. 3 to 6 show steps during inserting the subject plug into an
associated receptacle. FIGS. 7 and 8 show in detail what happens to
the plug and the contacts during this insertion. Referring first to
FIG. 3, the plug is brought into general alignment with the
associated receptacle in a conventional manner. The plug is then
inserted into the receptacle, as shown in FIG. 4. As soon as the
locking lance 46 contacts the upper edge of the receptacle cavity
22 the plug is forced rotated counterclockwise, as shown in FIGS. 5
and 7. This rotational movement causes the spring 48 of the plug 36
to be compressed. As soon as the locking lance 46 clears the edge
of the opening 24, the spring 48 will cause the plug to rotate in
the reverse direction (clockwise) to fully seat as shown in FIGS. 6
and 8.
It will be noted, FIG. 7, that as the plug 36 is rotated
counterclockwise, the male terminal contact 30 of the receptacle
passes through the front opening 44 of the plug and opening 54 of
the female receptacle contact 42 and between the leaf spring 62
with relatively low insertion force. The leaf spring 62 is
partially compressed at during this stage of insertion to overcome
the preloading of the spring by helper spring 68. When the plug is
fully inserted, as shown in FIG. 8, the spring 48 will cause the
plug to rotate in a clockwise direction, as shown, until the plug
is fully seated. The rotational movement will bring the locking
lance 46 into engagement with the aperture 50 at the top of the
receptacle cavity 22. The leaf spring contact will be resiliently
deflected by the rotation of the plug to store additional energy in
the spring contact. The resilient energy will bias the spring
contact into gripping relationship onto the male terminal. It is
generally known that a stiffer spring contact will produce a
greater gripping pressure on the male terminal which improves the
electrical connection therewith and also impedes the unwarranted
separation of the male terminal from the receptacle.
An alternate embodiment of the subject plug is shown in FIGS. 9 and
10, with like reference numerals identifying like parts. This plug
member 74 has a detent projection 76 at the forward end 78 on the
side opposite locking lance 46. Upon initial insertion of the plug
member 74 into the receptacle 22, the detent projection 76 engages
in shaped aperture 24a to lock the plug member in the receptacle
with contacts 30 and 42 not in engagement. This allows for a patch
system to be initially set up and subsequently electrically
connected by simply fully inserting the plugs. The expensive switch
over equipment normally employed to cut in new panels is thus
obviated.
The plug member 74 can be arranged in gang fashion similar to plug
unit 34. When the plug member 74 is used in a gang, then it is only
necessary for at least one of the plug members 74 to be provided
with the detent means 74.
It will be seen from the above discussion and from the drawings
that the subject of plug is readily adopted for high density
applications in that a relatively small rotational movement of the
plug is required to effect insertion and removal of the plug in a
patch system. The ganging of the plug is not limited to any number
of individual units, except for practical limits in handling.
The present invention may be subject to many modifications and
changes without departing from the spirit or essential
characteristics thereof. The present embodiment should therefor be
considered in all respects as merely illustrative and not
restrictive.
* * * * *