U.S. patent number 3,596,231 [Application Number 04/774,810] was granted by the patent office on 1971-07-27 for insulated electrical connector sleeve.
This patent grant is currently assigned to International Telephone & Telegraph Corporation. Invention is credited to Vernon L. Melton.
United States Patent |
3,596,231 |
Melton |
July 27, 1971 |
INSULATED ELECTRICAL CONNECTOR SLEEVE
Abstract
The connector includes a cylindrical socketed body embracingly
retained within an insulated sleeve, the sleeve including
overhanging portions extending beyond each end of the body.
Cylindrical end caps are provided which overfit and embrace the
sleeve at each end, the sleeve including a groove latchable onto
resilient lugs on the sleeve. Each end cap includes a sealing ring
portion on its inner surface which engages the sleeve when the end
caps are snapped into place. The end caps include a reinforcing
ring defining a push out or rupturable portion which seals the
conductor relative to the end cap.
Inventors: |
Melton; Vernon L. (Overland,
MO) |
Assignee: |
International Telephone &
Telegraph Corporation (New York, NY)
|
Family
ID: |
25102375 |
Appl.
No.: |
04/774,810 |
Filed: |
November 12, 1968 |
Current U.S.
Class: |
439/426; 174/93;
174/84C |
Current CPC
Class: |
H01R
4/20 (20130101) |
Current International
Class: |
H01R
4/20 (20060101); H01R 4/10 (20060101); H01r
011/08 () |
Field of
Search: |
;339/96,94,276
;174/84.1,93 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Champion; Marvin A.
Assistant Examiner: McGlynn; Joseph H.
Claims
I claim:
1.
A connector sleeve for insulated electrical conductors
comprising:
a. a cylindrical body including a socket at one end adapted to
receive a conductor wire,
b. an insulating sleeve including
1. A portion disposed in retained relation on the body, and
2. an overhanging portion extending beyond the body,
c. a cylindrical end cap overfitting and embracing a portion of the
sleeve and including a circumferential sealing means having an
initial, internal diameter less than the operative external
diameter of the embraced portion of the sleeve,
d. snap fastening means interconnecting the end cap and the sleeve
to preclude longitudinal withdrawal of the cap from the sleeve, the
snap fastening means including operatively engaging stop means and
abutment means, one of said operatively engaging means being
disposed about the outer surface of the sleeve and the other of
said operatively engaging means being disposed about the inner
surface of the cap,
e. the stop means including a plurality of circumferentially
disposed lugs cut and bent outwardly from the sleeve,
f. the cap including an inner circumferentially disposed groove
providing the abutment means, and
g. the lugs and groove defining circumscribing concentric circles
disposed in operatively overlapping relation.
2.
A connector sleeve for insulated electrical conductors
comprising:
a. a cylindrical body including a socket at one end adapted to
receive a conductor wire,
b. an insulating sleeve including:
1. a portion disposed in retained relation on the body, and
2. an overhanging portion extending beyond the body,
c. a cylindrical end cap overfitting and embracing a portion of the
sleeve and including a circumferential sealing means having an
initial, internal diameter less than the operative external
diameter of the embraced portion of the sleeve,
d. snap fastening means interconnecting the end cap and the sleeve
to preclude longitudinal withdrawal of the cap from the sleeve, the
snap fastening means including operatively engaging stop means and
abutment means, one of said operatively engaging means being
disposed about the outer surface of the sleeve and the other of
said operatively engaging means being disposed about the inner
surface of the cap,
e. the snap fastening means being operatively disposed in spaced
relation from the end of the sleeve, and
f. the circumferential sealing means being disposed inwardly of the
snap fastening means relative to the end of the sleeve, and
including longitudinally spaced, circumferentially disposed sealing
ring portions, one of said ring portions sealing an undistended
overhanging portion of the sleeve and the other of said ring
portions sealing a distended portion of the sleeve, the diameters
of said sealing ring portions being initially less than the
operative diameters of said associated and sealed sleeve
portions.
3.
A connector sleeve for insulated electrical conductors
comprising:
a. a cylindrical body including a socket at one end adapted to
receive a conductor wire,
b. an insulating sleeve including:
1. a portion disposed in retained relation on the body, and
2. an overhanging portion extending beyond the body,
c. a cylindrical end cap overfitting and embracing a portion of the
sleeve and including a circumferential sealing means having an
initial, internal diameter less than the operative external
diameter of the embraced portion of the sleeve,
d. the cylindrical body including opposed sockets at each end,
e. the insulating sleeve having an initial diameter less than the
diameter of the cylindrical body to retain the sleeve about the
body and including overhanging portions extending beyond each end
of the body,
f. s cylindrical end cap overfitting the sleeve in embracing
relation at each end, each cap including a circumferential sealing
means, each of said sealing means having an initial, internal
diameter less than the operative, external diameter of the
associated, embraced portion of the sleeve,
g. snap fastening means interconnecting each end cap and the
sleeve, each snap fastening means including operatively engaging
stop means circumferentially disposed about the sleeve and abutment
means circumferentially disposed about the inner surface of the
cap,
h. the stop means at each end of the sleeve including a plurality
of circumferentially disposed, resilient lugs, each lug being cut
and bent outwardly from the sleeve, and each lug having an attached
end and a free end, the attached lug end being closer to the end of
the sleeve and closer to the longitudinal center axis of the sleeve
than the free end, and
i. the abutment means of each end cap being provided by a
circumferential shoulder.
Description
BACKGROUND OF THE INVENTION
This invention relates in general to an electrical connector, and
in particular, to a compression connector having an insulating
sleeve extending between the connected conductors.
Inherent in the provisions of insulation for the compression type
of connector is the problem of retaining the insulation sleeve in
place, both before and during the crimping process. For example,
unless the insulation sleeve is held securely in place before
crimping, it may be misaligned when crimping occurs. An attempt has
been made to overcome this problem in the past by providing the
interior sleeve of the connector body with a groove around its
middle part and the insulating sleeve with a compatible rib
portion. Obviously, such formations require a special connector and
possible, a shaped insulation sleeve and, for this reason, are
expensive.
Another aspect of this problem is the tendency of the insulating
sleeve and the connector to be deformed unevenly during the
crimping process. Uneven deformation tends to break the insulation
seal and, even though the electrical insulation may be preserved,
the ingress of moisture into the vicinity of the connected parts
which may result, is highly undesirable. There is also the
likelihood that the insulation sleeve may be distorted into an
elliptical configuration during the crimping process, thereby
rendering the seal between the insulation sleeve and the conductor
less effective.
In the past, expandable, frangible C-rings have been located on the
insulation sleeve in compatible grooves formed thereon, in an
attempt to provide the necessary alignment means for locating the
compression tool used for crimping. The provision of such breakable
locating rings and the requisite seating therefor adds an
unnecessary complexity to the connection.
SUMMARY OF THE INVENTION
The present insulated connector includes an insulation sleeve which
has a substantially constant initial diameter as manufactured. A
portion of the sleeve is operatively distended over the connector
body.
The insulation sleeve is provided with tightly fitting snap-on end
caps which are rupturable to admit the conductors and yet which
maintain an effective seal between the conductors and the caps. The
configuration of the caps is such that superior sealing is
maintained between each cap and the connector sleeve. Further, the
caps provide spaced shoulders suitable for aligning the compression
tool.
The connector includes a cylindrical connector body having an
end-open socket adapted to receive a conductor and an insulating
sleeve which includes a portion disposed about the body and a
portion overhanging and extending beyond the body.
The insulating sleeve has an initial diameter less than the
diameter of the cylindrical body, and the sleeve is thereby
operatively retained in distended relation about the body.
Cylindrical end caps overfit and embrace the sleeve, the caps
including circumferential sealing means having an initial diameter
less than the operative external diameter of the embraced portions
of the sleeve.
Snap fastening means interconnects each end cap and the sleeve,
each snap fastening means including operatively engaging stop means
circumferentially disposed about the sleeve, and abutment means
circumferentially disposed about the inner surface of the cap. The
stop means includes a plurality of circumferentially disposed
resilient lugs, each being cut and bent outwardly from the
sleeve.
Each end cap includes an end wall having a concentric reinforcing
ring defining a rupturable portion, the rupturable portion
including concentric inner and outer portions adapted to be
substantially equal in diameter to the conductor and the conductor
insulation respectively.
The insulating sleeve includes a circumferential, transition
portion extending outwardly and tapered from each end of the body.
The cap is held in embracing sealed relation against the transition
portion by the snap fastening means.
A circumferential margin defined each end of the body, and the
sealing means, associated with each cap, includes sealing ring
portions oppositely spaced about the end body margin. The sealing
ring portions of each cap has different diameters, the ring portion
having the smaller diameter being located on the overhanging
portion of the sleeve.
BRIEF DESCRIPTION OF THE DRAWING:
FIG. 1 is a cross-sectional view of the connector assembly before
crimping, with one conductor in place and one conductor about to be
placed;
FIG. 2 is an enlarged cross-sectional view of an end cap before
emplacement;
FIG. 3 is an enlarged fragmentary detail illustrating the
diametrical relationship between the sleeve and end cap before the
sleeve is placed, and
FIG. 4 is a view similar to FIG. 3, showing the connector and end
cap after emplacement of the end cap.
DESCRIPTION OF A PREFERRED EMBODIMENT
Referring now by characters of reference to the drawing, and first
to FIG. 1, it will be understood that the connector generally
indicated by numeral 10 includes a metal cylindrical body 11 having
opposing sockets 12 and 13, and an insulating sleeve 14.
Cylindrical end caps 15 and 16 are provided at opposed ends of the
connector assembly.
The connector 10, as indicated in the drawing, is primarily
intended as an adapter connecting conductors 20 and 21. To further
this end, the sockets 12 and 13 are of a size sufficient to permit
the conductors 20 and 21 respectively, to be received therein by a
push fit.
The insulating sleeve 14 is preferably extruded from a weather
resistant nylon material and has an initial, internal diameter less
than the diameter of the connector body 11 so that when the
connector body 11 is pushed inside of the insulating sleeve 14, the
insulating sleeve 14 is distended, or stretched about the body 11.
The body 11 is shorter than sleeve 14 so that the sleeve 14 has
overhanging end portions 24 and 25. The overhanging end portions 24
and 25 of the sleeve 14 through which the connector body 11 is
initially pushed returns substantially to its original diameter.
The connector body 11 is retained within the sleeve 14 because of
the stretching of the sleeve 14 disposed about the body 11 and also
because of the tapered step in the sleeve 14 which is formed
outwardly of the end of the body 11 in the vicinity of the
circumferential margins 26 and 27 defining each end of the
connector body 11. It will be noted that the end margins 26 and 27
are chamfered in order to facilitate the insertion of body 11 into
the insulating sleeve 14.
It will be further noted that the connector body 11 has a constant
external diameter throughout its length and that the initial
diameter of the insulating sleeve 14 is likewise of a constant
diameter throughout its length. This feature produces a connector
10 of unique simplicity and reduces the cost of parts to a
minimum.
Each end cap 15 and 16 is held in place on the connector 10 by a
snap fastening means provided between each cap and the associated
overhanging end portions 24 and 25 of the sleeve 14 respectively.
The cylindrical sidewalls 17 of the end caps 15 and 16 are
substantially similar and coact with the sleeve 14 in a
substantially identical fashion, and for this reason, the same
reference numerals are used to denote similar parts. The end walls
18 and 19, on the other hand, are different to the extend that they
are adapted to receive a different size conductor, as will be
described later.
Each snap fastening means includes a stop means provided on the
sleeve 14, and an abutment means formed on the inside surface of
the end caps 15 and 16. (See FIGS. 3 and 4). The stop means
includes a plurality of circumferentially disposed resilient lugs
30 cut and bent outwardly from the sleeve 14. Each lug 30 is
attached to the sleeve 14 at one end and includes a free end 31
which projects outward from the center longitudinal axis of the
connector 10, and is disposed a greater distance from the end of
the sleeve 14 than the attached end of the lug 30, thereby
resulting in an outwardly and inwardly inclined lug 30. Each end
cap 15 and 16 includes a circumferential shoulder 32, constituting
the abutment means coacting with the lugs 30 to snap fasten each
cap 15 or 16 to the sleeve 14.
In the operative position, the outer diameter of the circumscribing
circle defining the lugs 30 is greater than the inner diameter of
the circle defining the shoulder 32, said circles being concentric
and operatively disposed in overlapping relation. The respective
concentric circles are indicated by points 33 and 34 respectively,
of FIG. 4. It will be understood that the overlapping relationship
of these circles, together with the resilience of the lugs 30,
permits each end cap 15 or 16 to overfit and embrace the sleeve 14.
Once in place, the caps 15 and 16 are securely retained on the
sleeve 14 and cannot be inadvertently removed.
Each of the cylindrical end caps 15 and 16 is overfitted on the
sleeve 14 in sealed relation therewith. The structural relation
between the sidewalls 17 of each end cap 15 or 16 and the
insulation sleeve 14 is illustrated in FIGS. 3 and 4 as read in
conjunction with FIG. 2. FIG. 3 illustrated, in phantom outline,
the initial form of the sidewall 17 superimposed on the insulation
sleeve 14. It will be understood that the overhanging end portions
24 and 25 of each sleeve 14 have substantially the manufactured,
initial diameter. Thus, between the overhanging end portions 24 and
25 and the stretched portion of the sleeve 14, there are tapered
steps 28 and 29 representing a transition between these two
different size portions of the insulation sleeve 14.
The inner face of each end cap 15 or 16 includes a ring portion 36
disposed adjacent to and inwardly of the lugs 30 relative to the
end of the sleeve 14. Another ring portion 36 is provided adjacent
each ring portion 35 and conjoined to it by means of an annular
shoulder 37. Both of the ring portions 35 and 36 have a smaller
diameter than the corresponding diameter of the associated sleeve
portions embraced by the ring portions 35 and 36. This relationship
results in a tight seal between the sleeve 14 and the end caps 15
and 16 because of the nature of the material employed. The
materials are preferably polyethylene for the caps 15 and 16 and
nylon for the sleeve 14.
It will be observed by comparing FIGS. 3 and 4, that the sealing
means between each cap 15 or 16 and its associated embraced end
portions 24 or 25 of the sleeve 14 includes circumferentially
disposed sealing ring portions 35 and 36. One of the ring portions
35 seals an overhanging end portion 24 or 25 of the sleeve 14. The
other of the ring portions 36 seals the distended portion of the
sleeve 14. The sealing ring portions 35 and 36 are longitudinally
spaced and disposed on opposite sides of the circumferential
margins 26 or 27.
It will be understood that the plurality of lugs 30 which coact
with the abutment 32 operatively retain the caps 15 and 16 in a
substantially fixed position relative to the sleeve 14. Further,
the step between the ring portion 35 and the ring portion 36
provides an annular shoulder 37 which tends to ride up the tapered
step 28 between the stretched and unstretched portions of the
sleeve 14. The net result of this arrangement is that the annular
shoulder 37 tends to be urged in a radial direction away from the
longitudinal axis of the connector 10, and also forwardly into the
tapered transition step 28. At the location indicated by numeral 37
in FIG. 4, there is a particular high concentration of pressure
both transversely and longitudinally of the sleeve 14.
As has been discussed above, the ends caps 15 and 16 have
substantially similar sidewall construction. The configuration of
each end wall 18 and 19 is substantially similar although
dimensionally different. The reason for the dimensional
dissimilarity is, that in the preferred embodiment, each of the
caps 15 or 16 is adapted to suit a different conductor 20 or 21
respectively. For this reason, the description of the end wall
structure will be confined to end cap 16, this cap being
illustrated in enlarged detail in FIG. 2, and will suffice for the
other cap 15.
The end wall 19 includes an inwardly formed frustoconical portion
40. On the interior face of the frustoconical portion 40 is a
concentric reinforcing ring 41 defining a rupturable portion 42,
which includes concentric inner and outer portions 43 and 44
respectively. The inner rupturable portion 43 is comparatively
thinner than the outer portion 44 and has a diameter substantially
equal to the diameter of the associated conductor 21 to be received
within the socket 13. The outer rupturable portion 44 extends
substantially to the inner margin of the reinforcing ring 41 and
has a diameter substantially equal to the diameter of the conductor
insulation 23. Thus in the operative position (as shown at the left
of FIG. 1,) the conductor insulation is substantially sealed by the
end wall, further rupturing of the end wall being limited by the
thickened reinforcing ring 41.
It is thought that the functional advantages of this connector have
become fully apparent from the foregoing description of parts, but
for completeness of disclosure the installation of the connector
will be briefly described.
The connector body 11 is pushed inside the insulating sleeve 14 and
substantially centralized longitudinally within the sleeve 14.
Because the connector body 11 has a greater diameter than the
internal diameter of the sleeve 14, the sleeve is stretched and
tends to hug the connector body 11. This stretched relationship
causes the connector 11 to be retained within the sleeve 14 and
moreover, the retention is enhanced because the overhanging end
portions 24 and 25 of the sleeve 14 are maintained at substantially
their initial diameter. Thus, any tendency for the connector body
11 mt move within the sleeve 14, is positively curtailed by the
stepped transition 28 between the stressed and unstressed portions
of the sleeve 14.
Each end cap 15 and 16 is pushed onto its associated end portion 24
or 25 of the sleeve 14, sufficient to bring the snap fastening
means into play. When the end caps 15 and 16 are pushed into
position, the comparative diameters of the embracing parts of the
end caps are such that the end caps 15 and 16 are tightly sealed to
the sleeve. Specifically, when the snap fastening means come into
play, the circumferential shoulder 37 rides up the tapered
transition step 28 to provide particularly tight sealing.
The connector 10 is now ready for use and in fact is preferably
supplied to the ultimate consumer with the end caps 15 and 16 in
place. The conductors 20 and 21, which have their ends bared of
insulation material may now be installed. As shown at the
right-hand side of FIG. 1, the diameter of the conductor 21 is
substantially equal to the inner rupturable portion 43 of the end
wall 19. This inner portion 43 is relatively weak and may be pushed
through without difficulty to permit the conductor 21 to be
inserted within the socket 13. When this insertion is completed,
the rupturable portion 42 is widened still further by the
insulation 23 up to the boundary of the reinforcing ring 41. When
the complete insertion is achieved, the reinforcing ring 41 tends
to act as a sealing ring and it is slightly expanded by the
insulation 23.
The complete operative insertion of a conductor is illustrated at
the left-hand side of FIG. 1 and the parallel disposition of the
formerly frustoconical portion of the end wall 18 indicates that
good sealing is achieved between the conductor insulation 22 and
the end cap 15.
When each of the conductors 20 and 21 is installed, the connector
is ready for crimping by means of a suitable compression tool. The
secure emplacement of the end caps 15 and 16 provides a pair of
spaced shoulders 45 which may be utilized to align the compression
tool during the crimping operation.
* * * * *