U.S. patent number 3,772,635 [Application Number 05/210,750] was granted by the patent office on 1973-11-13 for universal miniature connector for plural conductors.
This patent grant is currently assigned to Bell Laboratories Incorporated. Invention is credited to Dean Rudisill Frey, Robert Walter Henn, Donald Tolman Smith, Arthur Guntis Vedejs.
United States Patent |
3,772,635 |
Frey , et al. |
November 13, 1973 |
**Please see images for:
( Certificate of Correction ) ** |
UNIVERSAL MINIATURE CONNECTOR FOR PLURAL CONDUCTORS
Abstract
The connector is a basic-splice unit of three parts: an index
strip, a connector module, and a cap. The index strip has
alternately peaked and flat indexing teeth which help split the
wire pairs. The strip acts as a temporary wire holder when dressing
in wires to be joined. The connector module contains a double-ended
slotted contact element. The module top is similar in design to the
index strip top and performs the same functions. The module has two
rails along its length which accommodate an optional
bridge-connector block. The connector module snap-mounts to the
indexing strip. In this process the slotted beam contact element
penetrates the insulation and makes contact to the wire while the
connector module bears down on the wire on each side of the contact
element to firmly snug it in place. Between each tooth of the index
strip, a cantilever beam forces the wire against a snubbing brace
of the connector module, deflecting differing amounts depending on
the wire gauge.
Inventors: |
Frey; Dean Rudisill (Dover,
NJ), Henn; Robert Walter (Bridgewater Twp., Somerset Cty.,
NJ), Smith; Donald Tolman (Piscataway Twp., Middlesex Cty.,
NJ), Vedejs; Arthur Guntis (Morris Twp., Morris Cty.,
NJ) |
Assignee: |
Bell Laboratories Incorporated
(Murray Hill, NJ)
|
Family
ID: |
22784132 |
Appl.
No.: |
05/210,750 |
Filed: |
December 22, 1971 |
Current U.S.
Class: |
439/403; 439/488;
439/942; 439/460 |
Current CPC
Class: |
H04Q
1/021 (20130101); H04Q 1/114 (20130101); H01R
4/2433 (20130101); H04Q 1/06 (20130101); H01R
4/2429 (20130101); H01R 9/2416 (20130101); H04Q
1/141 (20130101); Y10S 439/942 (20130101) |
Current International
Class: |
H01R
9/24 (20060101); H04Q 1/14 (20060101); H01R
4/24 (20060101); H04Q 1/02 (20060101); H01r
009/08 (); H01r 003/00 () |
Field of
Search: |
;339/98,99,17F,176MF |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Champion; Marvin A.
Assistant Examiner: Pate, III; William F.
Claims
What is claimed is:
1. Apparatus for connecting two insulated conductors
comprising:
indexing means comprising:
first wire slot means,
first vertically yielding wire confining means in line with said
first wire slot means,
well means between said first wire slot means and said first wire
confining means,
connector module means comprising:
second wire slot means,
top snubbing means and bottom snubbing means,
double-ended conductive means mounted with its second end disposed
across said second wire slot means,
means for mounting said connector module means on said indexing
means so that said conductive means first end extends into said
well means and across said first wire slot means, said bottom
snubbing means forcing an insulated conductor against said first
wire confining means, and
cap means comprising:
second vertically yielding wire confining means, and
means for mounting said cap on said block means, said top snubbing
means forcing an insulated conductor against said second wire
confining means.
2. Apparatus for connecting two insulated conductors
comprising:
indexing means comprising:
first horizontally yielding wire slot means,
first vertically yielding wire confining means in line with said
first wire slot means,
well means between and extending below said first wire slot means
and said first wire confining means,
connector module means comprising:
second horizontally yielding wire slot means,
top snubbing means and bottom snubbing means,
double-ended slotted beam connector means mounted behind both said
snubbing means with the beam second end slot disposed across said
second wire slot means,
means for mounting said connector module means on said indexing
means so that said beam first end slot extends into said well means
across said first wire slot means so that said bottom snubbing
means forces an insulated conductor against said first wire
confining means causing the latter to resiliently yield;
first stuffing means for forcing an insulated conductor into said
first wire slot means, and
cap means comprising:
second wire stuffing means for forcing an insulated conductor into
said second wire slot means,
second vertically yielding wire confining means in line with said
second wire slot means, snubbing means for mounting said cap means
on said connector module means so that said top snubbing means
forces an insulated conductor against said second wire confining
means causing the latter to resiliently yield.
3. Apparatus for connecting at least one or more wires of a first
group respectively to one or more wires of a second group,
comprising:
indexing means comprising:
first wire slot means defined by adjacent flexible arms for
receiving a first wire from said first group,
first cantilever beam means mounted in line with said first slot
means, and
well means between and extending below said slot means and said
beam means,
connector module means comprising:
second wire slot means defined by adjacent flexible arms for
receiving a second wire from said second group,
a top snubbing brace and a bottom snubbing brace,
double-ended slotted conductive means mounted behind and crosswise
of said braces, with its second end slot facing said second wire
slot means,
means for mounting said connector module means on said indexing
means so that said conductive means first end extends into said
well means with its first end slot facing said first wire slot
means and so that said bottom brace snubs said first wire when
disposed in said first wire slot means against the yielding said
first beam means, and first wire stuffing means for forcing said
first wire into said first slot means, and
cap means comprising:
second wire stuffing means for forcing said second wire into said
second wire slot means when disposed therein,
second cantilever beam means mounted in line with said second wire
stuffing means, and
means for mounting said cap means on said connector module means so
that said top brace snubs said second wire against the yielding
said second cantilever beam means.
4. Apparatus pursuant to claim 2 wherein said indexing means
further comprises:
an interior floor,
upright spaced teeth rising from said floor between said wire
confining means, and
means mounting said wire confining means above said floor for
yielding movement toward said floor.
5. Apparatus pursuant to claim 4, wherein each said first wire
confining means comprises a cantilever beam suspended from an
interior support and extending over said floor beyond said
teeth.
6. Apparatus pursuant to claim 5, wherein said connector module
means further comprises:
an interior floor, and
upright teeth rising from said floor with spaces thereinbetween
each corresponding to a respective said second wire slot means.
7. Apparatus pursuant to claim 6, wherein each said second wire
confining means comprises a cantilever beam suspended from an
interior point in said cap and wherein said cap means further
comprises cavities between each two adjacent said cantilever beams
to accommodate said connector module teeth when said cap is mounted
on said connector module means.
8. Apparatus pursuant to claim 2, wherein each said first and said
second wire slot means comprise adjacent horizontally yielding arms
each rigidly supported at a top and a bottom end so that the
presence therebetween of an insulated conductor of greater diameter
than the nominal arm separation causes the arms to retract at the
contact zone and elsewhere to grippingly close over said
conductor.
9. Apparatus pursuant to claim 7, wherein each said first and said
second wire slot means comprises adjacent horizontally yielding
arms each rigidly supported at a top and a bottom end so that the
presence therebetween of an insulated conductor of greater diameter
than the nominal arm separation causes the arms to retract at the
contact zone and elsewhere to grippingly close over said
conductor.
10. Apparatus pursuant to claim 9 wherein the top of each said arm
curves outwardly at said slot entrance to form a wide-mouthed slot
entrance.
11. Apparatus pursuant to claim 2, wherein each said first wire
confining means comprises a cantilever beam suspended from a
support adjacent said well and said indexing means further
comprises:
an interior floor,
upright spaced teeth rising from said floor the backs of adjacent
said teeth defining an extension of said well, said cantilever beam
being suspended freely between adjacent said teeth outwardly above
said interior floor, thereby to grippingly accommodate different
conductor gauges with varying degrees of deflection of said
beam.
12. Apparatus pursuant to claim 3, wherein said double-ended
slotted conductive means further comprises a central narrow waist
section and said apparatus further comprises means for effecting
bridging connection of one or more wires of a third group to
respective ones of said central narrow waist sections.
13. Apparatus pursuant to claim 3, wherein said connector module
means further comprises:
upper and lower side rails extending outwardly respectively from
said top and bottom snubbing braces and defining therebetween an
elongated exterior surface, and
slot means through said exterior surface, each extending to a point
adjacent the central section of a respective one of said
double-ended slotted conductive means, thereby to provide
additional electrical access from without said apparatus to each
said conductive means.
14. Apparatus pursuant to claim 13 wherein said central section of
each said slotted conductive means comprises a narrow waist,
said rails each include latching holes, and
said apparatus further comprises bridge connector means comprising
a bridging block, and double-ended slotted contact elements mounted
in said block for engagement of first end slots with respective
said narrow waists.
15. Apparatus pursuant to claim 14 wherein said bridge connector
means further comprises third wire slot means defined by adjacent
flexible arms, the second said end slots of said slotted conductive
means facing said third wire slot means.
16. Apparatus pursuant to claim 15, wherein said bridge connector
means further comprises:
upright teeth with spaces therebetween, each space corresponding to
a respective said third wire slot means, and
a third snubbing brace disposed outwardly of said teeth, and
second cap means comprising:
third wire stuffing means each for forcing a wire to be connected
to a respective said contact element second end slot into a
respective said third wire slot means, and
third cantilever beam means mounted in line with said third wire
stuffing means, and
means for mounting said cap means on said bridge connector means so
that said third snubbing brace snubs said wires against said third
cantilever beam means.
17. Apparatus pursuant to claim 16 wherein said bridge connector
means further comprises latching nub means for engaging said
latching holes in each said rail.
18. Apparatus pursuant to claim 6, wherein the teeth of said
indexing means and said connector module means are alternately
flat-topped and peak-topped.
19. Apparatus pursuant to claim 4, wherein said index strip teeth
further comprise latching nubs and said lower brace further
comprises corresponding latching holes for grippingly engaging said
nubs thereby to snap-mount said index strip means on said connector
module means.
20. nodule means. pursuant to claim 6, wherein said connector
module means teeth further comprise latching nubs and said cap
means comprises an exterior forward wall with corresponding
latching holes for grippingly engaging said last-named nubs thereby
to snap-mount said cap on said connector module means.
21. Apparatus pursuant to claim 4 wherein said index strip
comprises a vertical female guide slot in each of its two end walls
for sliding engagement with a male guide member of an assembly
tool.
22. Apparatus pursuant to claim 21 wherein said connector module
means and said cap means each comprise a vertical female guide slot
in each of their respective two end walls for sliding engagement
with a said assembly tool male guide member.
23. Apparatus pursuant to claim 22 wherein said connector module
means further comprises a horizontal female guide slot in each of
its said two end walls for sliding engagement with said assembly
tool male guide member.
24. Apparatus pursuant to claim 3, wherein said connector module
means comprises open chambers substantially surrounding each said
conductive means first end slot, and viscous encapsulating means
filling said chamber.
25. Apparatus pursuant to claim 24 wherein said cap means comprises
open chambers adjacent each said second wire stuffing means, and
viscous encapsulating means filling each said chamber.
26. Apparatus pursuant to claim 3, wherein said means for mounting
said connector module means on said indexing means comprises: a
platen extending outwardly from the exterior side of said adjacent
flexible arms of said index strip means, said platen having an edge
notch therein, plural receiving slots extending downwardly from
said platen, each slot having narrow entrance wings and relatively
wider recesses therebeneath, and plural correspondingly shaped legs
extending from the lower edge of said connector module, each for
snapping engagement with one of said index strip receiving
slots.
27. Apparatus pursuant to claim 26, wherein said means for mounting
said cap means and said connector module means comprise a platen
extending outwardly from the exterior side of said adjacent
flexible arms of said connector module means, said platen having an
edge notch therein, plural receiving slots extending downwardly
from said platen, each slot having narrow entrance wings and
relatively wide recesses therebeneath; and plural correspondingly
shaped legs extending from a lower edge of said cap means each for
snapping engagement with one of said connector module means
receiving slots.
28. Apparatus pursuant to claim 12, wherein said conductive means
comprises bifurcated end portions defining an entrance to each said
end slot, said end portions having a relatively wide entrance that
tapers to the entrance width of said end slot, the latter having a
relatively narrow entrance width and a converging taper, the
thickness of said conductive means being substantially reduced at
each said bifurcated end portion.
29. Apparatus pursuant to claim 28, wherein each said conductive
means end slot extends toward said waist section a substantial
distance, the width of said conductive means being undiminished
along all of said substantial distance.
30. Apparatus pursuant to claim 18 further comprising color coding
of the peak-topped teeth of said index strip means and of said
connector block means.
31. Apparatus pursuant to claim 3, wherein said top and bottom
snubbing braces each comprise inwardly facing bevel surfaces for
effecting bending contact with insulated conductors.
32. Apparatus pursuant to claim 23, wherein said cap means
comprises a flat roof and said flat roof includes an indentation
along and inwardly of an entire edge, said indentation comprising a
bearing and guide surface for receiving a compression element of an
assembly tool.
Description
FIELD OF THE INVENTION
This invention relates to joining of electrical conductors; and,
particularly, relates to cable splicing connections in the
telephone multipair cable art.
BACKGROUND OF THE INVENTION
A wide variety of cable splicing connectors are presently used in
telephone plant to perform the three basic splices of butt, bridge
tap, and bridge splicing. Factors accounting for the many connector
designs include differing wire gauges to be spliced, connectors
designed to be used with various powered tools, need for an
encapsulated splice (especially in aluminum conductor cable),
modular designs to expedite wire handling and improve housekeeping,
and need for ever smaller module sizes.
Given the over one billion pair splices made each year by the
telephone industry and the manpower and material costs associated
therewith, there is ample incentive to better systematize splicing
work. Ideally, a single basic cable splicing connector to fulfill
all splicing needs is desired.
SUMMARY OF THE INVENTION
Accordingly, the following are all objects of the present
invention:
TO PROVIDE A SINGLE CABLE SPLICING CONNECTOR CAPABLE OF PERFORMING
ALL BUTT, BRIDGE TAP, AND BRIDGE SPLICING;
TO ACCOMMODATE ALUMINUM AND COPPER CONDUCTOR ALIKE IN THE WIDE
RANGE OF GAUGES IN SUCH A BASIC CONNECTOR;
TO AVOID COSTLY POST-ENCAPSULATION PROCEDURES BY BUILDING
ENCAPSULATION INTO SUCH A CONNECTOR;
TO ELIMINATE USE OF CONNECTORS WHICH HAVE NO ABILITY TO ACCEPT A
BRIDGE TAP;
TO ACHIEVE A MODULAR DESIGN, BY WHICH IS MEANT A DESIGN CAPABLE OF
ORDERLY SPACIAL GROWTH, SO THAT WIRE HANDLING IS MINIMIZED AND
IMPROVED HOUSEKEEPING RESULTS;
TO REDUCE MODULE SIZE THEREBY HOLDING DOWN THE OVERALL SPLICE
BUNDLE SIZE IN A SPLICE CASE; WHEN DESIRED TO PREVENT DISASSEMBLING
A ONCE-ASSEMBLED MODULE, THEREBY TO PREVENT REUSE;
To provide a basic two-wire joint with an easily addable bridge-on
feature;
TO MAKE POSSIBLE USE OF POWER TOOLING OR HAND TOOLING FOR ALL
SPLICING OPERATIONS;
TO PRESERVE THE OPTION IN SUCH A BASIC-SPLICING CONNECTOR OF A
REUSABLE CONTACT ELEMENT AND DIFFERENT REUSABLE CAPS FOR USE IN
TERMINATING PAIRS IN APARATUS WHICH REQUIRES OCCASIONAL PAIR CHANGE
AND REARRANGEMENTS;
To provide where desired test point accessibility; and
to preserve the option for bridge-tapping in such a basic
splicing.
The above and other objects are achieved in the present invention
which consists of a basic-splice unit of three parts: an index
strip, a connector module, and a cap. The index strip,
advantageously using alternately peaked and flat-top indexing
teeth, splits the wire pairs and acts as a temporary wire holder
when dressing in wires to be joined.
The connector module contains a double-ended slotted contact
element. The module top is similar in design to the index strip top
and performs the same functions. The connector module has two rails
along its length which provide support and lock for a
bridge-connector block.
Between each tooth of the index strip, to one side, a cantilever
beam supports the wire against a snubbing brace of the connector
module. The beam helps in the accommodating of a range of wire
gauges, as from 26 through 20 gauge wires.
The connector module snap-mounts to the indexing strip. In this
process the slotted beam contact element penetrates the insulation
and makes contact to the wire while the connector module bears down
on the wire on each side of the contact element to firmly snub it
in place.
The contact element of the connector module is of the type taught
for example in B. C. Ellis U.S. Pat. No. 3,496,522 issued Feb. 17,
1970. Pursuant to one aspect of the invention, however, each
element may be engaged at a central thin web section, by similar
contact elements arranged in a bridge-connector module which mounts
to two lateral rails built along one side of the connector module.
The web sections are accessible through aligned slots in the wall
of the connector module and are normally fully protected with
encapsulant.
Pursuant to another feature of the invention, the index strip and
the connector module include wire slots having horizontally
deflectable walls that further serve to grip and snub the wires to
be joined in a standard butt splice. Gripping in a vertical sense
of the wires dressed into the teeth of the connector module is
achieved by cantilever beams built into the connector module cap.
The latter snap-mounts on the connector module by the same type
mechanism that snap-mounts the connector module on the index
strip.
Pursuant to a further feature of the invention, the index strip,
connector module and cap include vertical end grooves of a standard
size that accommodate to a holder used in conjunction with either a
power or a hand tool for making connections and cutting wires to
length.
In using the splicing connector system of the present invention,
the splicer first places the end grooves of the index strip into
the guide tabs of a tool. Then, using the alternate peaked teeth of
the strip, as a visual and physical guide he quickly locates and
manipulates the pairs into position. The tool head is applied to
the strip, snubbing the wires down into position. The tool head
cuts off one set of conductor ends. Then, the connector module is
placed in the same guide tabs of the tool, other wires are
positioned into the connector module teeth, and the tool head is
again applied to snub down the wires. The slotted beam contact in
the connector module pierces insulation and electrically contacts
the wires in the indexing strip and module. The ends of conductors
applied to the module are cut, and the action also snap-mounts the
module onto the index strip. Finally, the cap is applied through
the same guide tab and is snap-mounted onto the module.
For thereafter applying a bridging connector, pursuant to another
feature of the invention, the now-assembled butt splice is removed
from the tool and rotated 90.degree. and reinserted on the tool
through a second set of end grooves supplied in the connector
module. In this orientation, the bridge-connector mounting rails of
the connector module are projected upwardly to receive the bridging
cnnector.
The foregoing objects, features, and advantages of the invention as
well as others not summarized above, will be readily noted from a
reading of the description to follow of an illustrative
embodiment.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is an exploded perspective view showing the index strip, the
connector module, and the module cap;
FIG. 2 is a partial isometric front view of the index strip;
FIG. 3 is a partial isometric rear view of the index strip;
FIG. 3A is a sectional end view of the index strip;
FIG. 3B is a rear partial view of the index strip;
FIG. 3C is a front partial view of the index strip;
FIGS. 4A and 4B are exploded and slightly rotated isometric views
of the two parts of the connector module, before the two parts are
assembled;
FIG. 5 is a partial isometric rear view of FIG. 4B;
FIG. 6 is a partial bottom perspective view of connector module
portion shown in FIG. 4B;
FIG. 6A is a rear perspective view of the slotted beam contact
element;
FIG. 7 is an end view of the connector module;
FIG. 8 is a bottom perspective view of the cap;
FIG. 9 is an exploded perspective view of the bridging connector
showing the two components of which it is molded before their
assembly;
FIG. 10 is a partial rear iosmetric view of the bridging
connector;
FIG. 11 is an assembly view of the index strip connector module and
cap assembled as a two-wire butt connector, showing also a bridge
module and its cap assembled and ready to be placed into the butt
assembly;
FIGS. 12A, 12B, and 12C are various perspective views of an
assembly tool in use assembling the components of the
invention.
DETAILED DESCRIPTION OF AN ILLUSTRATIVE EMBODIMENT
The structure of each of the parts that in combination make up a
two-wire butt assembly with bridge module will first be described,
followed by a description of the operation of the connector which
will include its functional features.
A two-wire butt assembly is shown in FIG. 1 as consisting of an
index strip 100, a connector module 200 and a cap 300. This
assembly connects at least one or more wires of a first group
respectively to one or more wires of a second group.
INDEX STRIP
FIGS. 1, 2, 3, and 3A-C show the index strip 100. It consists of a
lower body designated generally 101 with a generally flat
undersurface 102 and a side floor 103. An end wall 104 rises
vertically from body 101 and includes a vertical female guide slot
105.
A plurality of spaced teeth 106 rise vertically from body 101.
Alternate teeth 106 have flattened top surfaces 107; and the other
teeth 106 have peaked cathedral roofs 108. Each tooth 106 is set
back slightly from the side edge 109 of index strip 100, to create
a narrow ledge 109a. Each tooth 106 includes a latching nub 110 on
its front surface about midway along its height.
In between each tooth 106, and along the rear side of strip 100 are
wire slots 111 formed by adjacent upright arms 112. The arms 112
are formed by two vertical through-slots 113 in a dome-roofed riser
114 located directly behind each tooth 106 and connected thereto by
a web 115. With no conductor in the slots 111, the arms 112 are
vertical and substantially separated by a constant distance. When a
conductor 241 is introduced in slot 111, the arms 112 horizontally
deflect away from each other in the vicinity of the conductor, and
because of their mode of suspension, toward each other in the
region above the conductor as seen in FIG. 1. This reverse bend
serves to further snub and secure a conductor such as conductor
241.
Along the entire rear surface of index strip 100 is a platen
surface 117 which has an edge notch 118. The surface 117 serves as
a conductor cutting anvil, as will be described. The region is
broken periodically by slots 119 which have beveled snap-in
entrance wings 120. Each slot 119 advantageously is located
laterally in line with the teeth with peaked roofs 108, and thus
out-of-line with the wire slots 111.
FIGS. 1, 2, 3A, and 3C show a vertically yielding wire confining
means comprising the cantilever beam 116 suspended above the side
floor 103 and between each of the teeth 106, in line with each wire
slot 111, and preferably at nominally the same level as slot 111.
Beam 116 is not attached to the adjacent walls of the teeth 106;
and has sufficient flexibility to deflect all the way into contact
with the side floor 103. Each beam 116 extends beyond the front
vertical surface of the teeth 106 as seen in FIG. 3A.
A vertical slot 121 is defined between each two webs 115, and the
adjacent interior surfaces of the riser 114 and the teeth 106. The
slot 121, as seen in the breakout of FIG. 1 and in FIG. 3A, extends
below the level of the conductor slots 111, to form a well 122. The
slots 121 receive conductive means such as double-ended slotted
beam contact elements 219 mounted in the connector module 200,
which pierce the insulation of conductors placed in the conductor
slots 111 between the upright arms 112 and the cantilever beam 116.
The well 122 may contain an encapsulant compound 99, such as
polyethylene-polybutene compound or a like nonconductive,
nonflowing normally highly viscous material that protects cut wire
ends against water and corrosion.
As earlier stated, the splicing connector of the present connection
is modular; and advantageously may be made in, for example,
five-pair modules or 25-pair modules. In the latter case, it is
desirable pursuant to a further inventive feature to make each
fifth tooth, such as tooth 106A in FIGS. 3B and 3C wider than the
others. This will avoid the inadvertent placing of a five-pair
connector module on anything but the right teeth.
CONNECTOR MODULE
Numeral 200 designates the connector module, as seen in FIG. 1. A
convenient way to illustrate the complex interior structure of
connector module 200 is by showing the two parts of which the
module seen in FIG. 1 is made: the front part 200A seen in FIG. 4A
and the rear part 200B seen in FIG. 4B. This approach teaches at
the same time the presently preferred way of molding the connector
module; but it should be understood that the term connector module
refers to the entire module as assembled and used in practice, such
as is depicted in FIG. 1.
FIG. 5 illustrates rear part 200B as having a rear face 201 with a
lower edge 202 having a notch 203 and downwardly extending legs
204, each with two arrowback grips 205. The legs 204 lock into
slots 119 of index strip 100.
Rear face 201 terminates at a top edge or platen 206 which includes
a notch indentation 207. Top edge 206 serves as a conductor cutting
anvil in a manner to be described. Into the top edge 207, plural
receiving slots 208 with entrance wings 209 are placed, which
snap-mount latching legs 305 of the cap 300.
Along top edge 206 are plural dome-roofed risers 210, substantially
identical to the risers 114 of index strip 100. The dome roofs of
risers 210 have chamfers 218. The risers 210 include two vertical
through-slots 211 in each, which structure creates upright arms
212. Between each adjacent two of the arms 212 and the
corresponding adjacent teeth 214 is defined a conductor slot 213.
In front of each riser 210 alternate teeth have a flattened top
surface 215 while the others have a peaked cathedral-like roof 216.
Each of the teeth 214 is attached to the corresponding riser 210 by
a narrow web 217.
Advantageously, one or both sides of each cathedral roof 108 and of
each cathedral roof 216 may be identically color-coded such as with
the color sequence blue, orange, green, brown, slate. Color coding
of the roofs 108, 216 facilitates spotting the point over which to
correctly split each differently color-coded pair of
conductors.
The inner recesses of connector module 200 are best explained with
the aid of FIGS. 4A, 4B, 5 and 6, beginning with the contact
element 219 and its mounting.
Each contact element 219, as depicted in FIG. 6A and seen also in
FIG. 1, is basically an elongated conductive means comprising
bifurcated end portions 223A which define a wide-mouthed entrance
to end slots 223. The wide-mouthed entrances taper to entrance
width of the corresponding end slot 223, the latter thereafter
undergoing a slowly converging taper. The thickness of the contact
element is substantially reduced at each of the bifurcated end
portions. The slots 223 extend toward a norrow waist section 220,
and terminate within the body of element 219 before the body begins
undergoing the indentations 221.
A series of radial or half-circle mounting surfaces 222 are molded
into the module interior, at positions which place the space
between adjacent half circles 222 in a plane with the conductor
slots 213. Thus, the element 219 mounts on the half-circle surfaces
222 as seen in FIG. 1, which places its upper insulation-piercing
slot 223 in line with--or facing--the conductor slot 213. The lower
insulation-piercing slot 224 is, when the module 200 is applied to
index strip 100, introduced into the well 122 so that the lower
slot 224 is in line with or facing the conductor slots 111.
The contact elements 219 mounted on surfaces 222 are housed in a
loose fit, in a well 225 formed of the zone between adjacent webs
217, the backs 212A of adjacent upright arms 212, and the backs
214A of adjacent teeth 214. The element 219 lower slot 224 extends
through the tunnel 253 which is seen in FIG. 6, and in
cross-section in FIG. 1.
As seen in FIG. 4B, the front end floor and slot 213 constitute a
snubbing surface 226 between each of the teeth 214. An elongated
top snubbing brace 227 seen in FIG. 7 having a downwardly tapering
surface 228 joins the snubbing surface 226 as seen in FIG. 1.
Extending out from the brace 227 is an upper rail 229 and below
this is a lower rail 230. The rails 229, 230 receive a bridging
connector pursuant to the invention, in the manner to be described.
Rails 229, 230 are respectively provided with a row of spaced
latching holes 231. The vertical surface 232 between the rails 229,
230 includes a series of upright walls 233 which affords improved
dielectric breakdown between contact elements of the bridging
connector to be described. In the surface 232, midway between each
pair of adjacent walls 233, and in line with the waist 220 of pin
connectors 219, there are provided bridging slots 234 with tapered
entrances, as seen in FIG. 7. The bridging slots 234 provide
additional electrical access from without the assembly to each
contact element 219.
Beneath the lower rail 230 is molded the bottom snubbing brace 235
of the module 200. Along the length of the brace 235, latching
holes 236 are spaced so that the module 200 can fit over the teeth
106 of index strip 100 and into latching engagement with the
latching nubs 110 of teeth 106.
The interior of module 200 shown in FIG. 6 includes arches 237
which are bordered by downwardly extending wire stuffers 238. The
slotted contact elements, as seen, are mounted behind the braces
227, 235. When the connector module 200 is applied to an index
strip 100 through which conductors have been dressed, the wire
stuffer 238 first bears down upon each insulated conductor lodged
in the slots 111, thus to ensure that thereafter each conductor is
fixably positioned for receiving contact element 219.
Every alternate one of the arches 237 is provided with a split 239
as shown in FIG. 4B, which accommodates a key (not shown) axially
located under alternate mounting surfaces 222, to block space
between surface 222 and tooth surface 107 on index strip 100 for
the purpose of maintaining dielectric strength between adjacent
contact elements 219.
Centered directly behind each wire stuffer 238 is a clearance
cutout or recess 240 for the snubbed conductor, which permits each
conductor end to be enclosed and surrounded by encapsulant 99 for
the purpose of maintaining dielectric strength between adjacent
conductors. The recesses 240 are separated by walls 243 which are
molded between each of the legs 204. An encapsulant is
advantageously preplaced in recess 240.
Opposite the notched lower edge 202 of connector module 200 is the
front brace 235 which acts as a snubbing bar and has an inwardly
facing bevel surface 242.
As seen in FIG. 3A, the index strip cantilever beams 116 extend
beyond the forward edges of the teeth 106. When th module 200 is
pressed down on the index strip 100, the brace 235 effects bending
contact with insulated conductors such as 241 resting on the beams
116, deflects the beams 116 and the conductors downwardly until the
latching holes 236 lock onto the latching nubs 110 of the strip
100. At this point, the conductor 241 is firmly snubbed by the
brace 235.
The connector module 200 includes vertical female guide grooves 244
at either end which enable the module 200 to mount in the bed of a
hand- or power-operated splicing tool with the teeth 214 pointing
upwardly, as will be described. A horizontal female guide groove
245 is also formed in the sides of module 200 to enable mounting in
a tool bed so that the bridge connector mounting rails 229, 230
face upwardly.
As with the index strip teeth 106, every fifth tooth of the module
teeth 214 is widened (not illustrated) to help avoid placing the
cap 300 improperly. Each of the teeth 214 is provided with latching
nubs 246.
It would be appreciated that in FIG. 4A the detail denoted 247 that
resembles a space capsule, and the L-shaped grooves 248 are merely
molding details to facilitate assembly of the two parts, 200A, 200B
by insertion of the detail 247 into the like-shaped holes 249. The
tongues 250 of part 200B, shown in FIG. 6, lodge in the grooves
248. The plug portions 251 of detail 247 will upon assembly with
their female counterparts protrude through the assembly holes 252
seen in FIG. 5. The plugs 251 thereafter will be rendered flush
with the surface of the rear face 201 of the module. Obviously,
other ways may be devised by persons skilled in the molding art to
construct the connector module.
CAP STRUCTURE
The cap designated 300 and seen in FIGS. 1 and 8 consists of a
generally flat roof 301 with a longitudinal groove 302 which
accommodates a tool-cutting or compression blade. A vertical guide
groove 303 in each end is received in a tool-mounting fixture when
the cap is to be assembled to the connector module 200.
The bottom rear edge 304 of cap 300 is continuous except for legs
305 each of which include a pair of arrowback grips 306. The legs
305 fit into receiving slots 208 of the connector module 200. The
notched indentation 207 of the module 200 is contacted by edge 304
and by the offset regions 307 directly above it. On either side of
each leg 305, the offset regions are extended into a wire recess
308, each of which falls in line with a respective conductor slot
213 of the module 200. Above each wire recess 308 is a wire stuffer
309 formed by a downwardly depending rib whose bottom surface 310
is planar with the top roof 311 of each recess 308. Encapsulating
sealant 99 is preplaced in the interior cavities of cap 300,
including recess 308, wells 315, and in the regions below beams
316.
When the cap 300 is in place on module 200, the module's risers 210
are accommodated in the chambers of cap 300 that are defined
between each stuffer 309 and slanted roof portions 312, which
latter contact the chamfers 218 of the dome of risers 210.
Along the forward wall 313 of cap 300 are plural-spaced latching
holes 314 similar in purpose and function to the latching holes 236
of the module 200. The bottom edge of forward wall 313 includes
spaced wells 315 which receive a beam 316 that deflects when coming
in contact with a conductor present on snubbing surface 226 of
module 200. The deflecting beam 316 is the same in purpose and
basic structure as the beam 116 of index strip 100.
OPERATION OF INDEX STRIP, CONNECTOR MODULE AND CAP
The two-wire butt assembly that is shown assembled in FIG. 11 is
pieced together with the aid of a tool such as depicted in FIGS.
12A, 12B, and 12C. The tool designated 400 consists essentially of
a base or platen 401 with a longitudinal slot 402 that is just wide
enough to snugly receive the width of index strip 100. Rising
normally from the slot 402 are ribs 403 which engage the female
guide slots 105 of index strip 100, then the guide groove 244 of
the module 200, and finally the guide groove 303 of cap 300. To
assure a tight fit, the ribs 403 can be spring-loaded (springs not
shown).
A head 405 is pivotally attached to the base 401 by pivot arm 406.
Head 405 mounts a boss bar 407 from the bottom edge 408 of which
extend plural bosses 409. Behind the boss bar is mounted a blade
410 that advantageously is extensible beyond the bosses, or
retractable.
For assembly, an index strip 100 is placed as described in the tool
base 401 with its teeth 106 facing upwardly. Then, insulated
conductors 241 are loosely placed in the conductor slots 111
between the upright arms 112 and between the corresponding spaced
teeth 106.
With all conductors in place, the head 405 is pivoted into position
above the strip 100, and the boss bar 407 is forced downwardly, the
spaced bosses 409 pressing each respective insulated conductor 241
fully down in its slot 111 and causing the arms 112 to horizontally
yield. The extent of boss penetration is limited by contact of the
boss bar bottom edge 408 on the flattened top surfaces 107 of strip
100.
Toward the end of the downward stroke, the blade 410 severs the
conductors on surface 117 which serves as a cutting anvil as in
FIG. 3. The head 405 then is pivoted away, and a connector module
200 is placed on the tool guide ribs 403 and brought down into
contact with strip 100. The tool head 405 is again swung into
position and brought down.
Pressing against the connector module 200 flattened top surfaces
215, the head 405 first causes the lower insulation-piercing slot
of each element 219 to engage the conductors 241 by slicing through
the outer insulation and effecting firm compliant electrical and
mechanical connection to the underlying wire. As this connection is
made, toward the end of the downward stroke of head 405, the legs
204 snap into the slots 119 of strip 100. Similarly, the latching
nubs 110 engage the latching holes 236 of module 200, thus
achieving in this dual fashion a permanent engagement of the module
200 to the underlying strip 100. During this procedure, sealing
compound preplaced in connector module 200 cavities formed by
surfaces 253, 254, 255 of the connector module end and preplaced
also in slot 121 of index strip 100, is displaced and surrounds the
electrical connection.
The assembly tool head 405 is again raised and swung back. The
splicer uses the cathedral roofs 216 of module 200 to split his
pairs, just as he used the cathedral roofs 108 of strip 100 to do
likewise.
Thus, conductor pairs to be selectively connected to those now
mounted on index strip 100 are assembled onto module 200 in exactly
the manner described for the assembly of conductors onto strip 100.
The boss bar 407 similarly is then engaged to snub down the
conductors on their snubbing surfaces 226, thus effecting
connection between these conductors and the upper
insulation-piercing slot 223. The blade 410 severs the conductor
ends, using surface 206 as a cutting anvil.
The head 405 is again retracted, and a cap 300 is placed on ribs
403. The final downward stroking of head 405 brings the vertically
deflecting beam 316 into engagement with the conductors. Beam 316
puts a snubbing bend in each conductor by causing it to press
against snubbing surfaces 226, brace 227 and upper rail 229.
Finally, the legs 305 of cap 300 snap into receiving slots 208 of
module 200; and the latching nubs 146 engage the latching holes 314
of the cap 300.
Additionally, the cantilever beam 116 acting at one point of a
conductor 241, and the horizontally deflecting upright arms 112
acting at a close second point of the conductor provide rigid
support of the conductor in the vicinity to each side of the
contact element 219, thus preventing motion of the conductor in the
area to be contacted.
An alternative tool operation could be to put the connector module
200 on the guides over the index strip 100, then dress the wires
into the top of the connector module and then press the connector
module onto the index strip, seating and cutting the wires in this
operation.
A further inventive embodiment is illustrated with the aid of
portions of FIGS. 6 and 8. A blade which performs the function of
the tool blade 410 is added directly into the connector module. As
seen in FIG. 6, a blade 260 fits into a slot 261 of the module 200
so that the blade outer surface is substantially flush with the
interior surface of legs 204. The edge 262 is also flush with the
same surface, and extends about 40 mils below the wire sutffers
238.
Similarly, in FIG. 8, a blade 320 is mounted into a slot 321 of cap
300 with the blade outer surface flush with the interior surface of
the legs 306, and with the blade edge 322 extending about 40 mils
below the wire stuffer bottom surface 310.
The blades 260 and 320 advantageously may be made of a ceramic or
glossy material, or an equivalent, that is hard enough to slice
relatively ductile metal, sufficiently nonbrittle, and has good
insulative and dielectric properties. The blades may be adhered to
the mounting slots by a suitable adhesive.
It should be apparent from the foregoing discussion that the
connector module upright arms 212 and the index strip upright arms
112 are each rigidly supported at a top and a bottom end. The wire
slots which they thus serve to define are made so that the presence
therebetween of an insulated conductor of greater diameter than the
nominal arm separation causes the arms to retract at the contact
zone. Elsewhere, the arms grippingly close over the conductor, as
in a reverse bend shown in FIG. 1.
Depending on the wire gauge size, when the module 200 has
snap-mounted into place, the beams 116 may actually be in contact
with the index strip side floor 103; and the insulation of the
conductors 241 may actually be deformed.
The operation of the lower brace 235 and the index strip cantilever
beam 116 is to grippingly accommodate different conductor guages
with varying degrees of deflection of the beam 116. This is due in
part to the cantilever beam being suspended from an interior
position outwardly between adjacent teeth at a nominal at-rest
position above the interior floor. The same operation holds true
with respect to the interaction of deflecting cantilever beams 316
of cap 300 and the snubbing surface 226 of module 200.
The index strip 100, connector module 200 and cap 300
advantageously may be made by plastic molding procedures known to
the art. Materials of which each may be made include polycarbonate,
polyamide, or a polystyrene or related polymer such as ABS resin,
all of which provide good mechanical strength and rigidity as well
as adequate electrical insulation.
BRIDGE CONNECTOR
As seen in FIGS. 9 and 10, a convenient way to illustrate the
structure of the optional bridge connector is by showing the two
parts 500A and 500B of which the connector is made. The bridge
connector designated 500 consists of a rear surface 527 with a
platen 515 running from one end wall 505 to a second end wall not
shown. An edge notch 514 is provided in platen 515, as well as
slots 516 with snap-in entrance wings 528. Latching nubs 525 are
formed both on rear surface 527 and on front surface 529 shown in
FIG. 9.
Conductor slots 530 opening onto platen 515 are formed between
adjacent domed roof risers 508. Two vertical slots 509 in each
riser 508 form horizontally yielding flexible arms 510 which yield
to conductors in the manner described with respect, for example, to
arms 212 of connector module 200.
Forward of each riser 508 is a tooth 501, joined to the
corresponding riser 508 by a web 507. A well 511 is formed by
adjacent webs 507, the backs 510A of adjacent upright arms 510, and
the backs 501A of adjacent teeth 501. The well 511 is similar to
the well 225 shown in FIG. 1, and is for the purpose of mounting
and housing double-ended slotted metallic contact element 504 which
may for example, be similar to the element 219 shown in FIG. 1 and
in FIG. 6A. The element 504 mounts on adjacent half-circle mounting
surfaces 523.
The holes 520 are for the purpose of bleeding encapsulant during
assembly. The two pieces 500A and 500B are advantageously molded
separately, and then joined by insertion of molding ribs 519 into
mounting grooves 523, with the half circles 522 fitting through the
circular openings 524 formed between adjacent downwardly extending
ribs 513.
The conductor slots 530 are substantially at the same level as a
floor 526 which is adjacent to each tooth 501. On the outboard side
of each tooth 501, are latching nubs 512. Each alternate tooth 501
has a peaked cathedral roof 503; and the in-between teeth 501 have
flattened top surfaces 502.
A snubbing brace 517 with an inwardly facing bevel 518 is situated
next to the floor 526 between each two adjacent teeth 501. The
bevel 518 tends upwardly from floor 526.
Pursuant to another aspect of the invention, a cap identical to the
cap 300 snap-mounts onto bridge connector 500 by engagement of
slots 516 by legs 305 and of nubs 512 by latching holes 314. The
action of deflecting beam 316 on a conductor 541 in slot 530 is the
same as has already been described in earlier mention of beam 316.
Likewise, with the cap 300 snap-mounted in place, the brace 517
snubs the conductor 541 and the wire stuffer 309 of cap 300 stuffs
conductor 541 into the slot 530.
The pin connector ends 504A of connector 504 extend downwardly and
out beyond the lower edge 506, as seen in FIG. 11. Engagement of
bridge connector 500 onto connector module 200 is by latching of
nubs 525 into the latching holes 231, with the ends 504A extending
through the bridging slots 234 and into gripping contact with the
narrow waist 220 of the connector module contact element 219.
It is to be understood that the embodiments described herein are
merely illustrative of the principles of the invention. Various
modifications may be made thereto by persons skilled in the art
without departing from the spirit and scope of the invention.
* * * * *