U.S. patent number 3,573,713 [Application Number 04/777,714] was granted by the patent office on 1971-04-06 for connector.
This patent grant is currently assigned to Minnesota Mining and Manufacturing Company. Invention is credited to James H. Bazille, Jr., Dennis J. Enright.
United States Patent |
3,573,713 |
Enright , et al. |
April 6, 1971 |
CONNECTOR
Abstract
A connector for making solderless electrical contact between
corresponding conductors of bonded wire-pairs each having two
parallel conductors.
Inventors: |
Enright; Dennis J. (St. Paul,
MN), Bazille, Jr.; James H. (St. Paul, MN) |
Assignee: |
Minnesota Mining and Manufacturing
Company (St. Paul, MN)
|
Family
ID: |
25111036 |
Appl.
No.: |
04/777,714 |
Filed: |
November 21, 1968 |
Current U.S.
Class: |
439/402;
439/405 |
Current CPC
Class: |
H01R
4/2433 (20130101) |
Current International
Class: |
H01R
4/24 (20060101); H01r 011/20 () |
Field of
Search: |
;339/97--99,101,113 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
392,174 |
|
May 1933 |
|
GB |
|
192,890 |
|
Nov 1964 |
|
SW |
|
Primary Examiner: Purser; Ernest R.
Assistant Examiner: McGlynn; Joseph H.
Claims
We claim:
1. A wire connector adapted for connecting together corresponding
wires of at least two twinned-wire wire pairs, comprising in
combination:
a cup-shaped jacket member havIng a series of generally parallel
elongate wire-supporting surfaces, one for each wire of each
twinned pair of wires, ridged to form a continuous ridge between
adjacent pairs of wire-supporting surfaces, deeply grooved to form
an open groove between the two wire-supporting surfaces for each
said pair, and slotted transversely of said grooves to form aligned
slots across corresponding wire-supporting surfaces of adjacent
pairs;
said cup-shaped member being further provided, for each of said
adjacent pairs of wire-supporting surfaces, with access openings
aligned therewith and having an interconnected double circle cross
section; and
a cap member, forcefully insertable within said jacket, carrying
extended parallel sharp-edged separator plates in line with said
grooves and electrically conductive resilient flat thin contact
elements in line with and extending along said aligned slots, each
said element being slotted in line with one set of said
corresponding wire-supporting surfaces.
2. A wire connector as defined in claim 1 wherein said cap is
stably supported on said jacket with said separator plates aligned
with said open grooves and adjacent said wire-supporting surfaces
for guiding wire pairs into position for interconnection.
3. A wire connector as defined in claim 2 and having a wire-entry
extension containing wire-receiving channels forming said access
openings in alignment with said wire-supporting surfaces.
4. A wire connector as defined in claim 3 and wherein said
wire-entry extension carries indicia for indicating the position of
said contact elements.
Description
This invention relates to solderless wire connectors which,
although useful in connecting single wires, are particularly
adapted for use with bonded pairs of insulated wires (twinned wires
or wire pairs) wherein the two conductors are held in separated
side-by-side parallel relationship by means of a unitary plastic
insulating cover surrounding both wires and having a figure 8 or
twin-circle cross section such as is commercially available under
the trade designation Unipair conductor. These wire pairs come in
various wire sizes, e.g. from No. 28 to No. 22 B & S gauge, and
ordinarily with a polyethylene or similar plastic insulating
covering.
Connectors for flat multiwire cables have previously been
described, for example in U.S. Pat. No. 3,189,863, in which a
permanent solderless connection is made possible through the use of
thin flat resilient bifurcate contact elements which penetrate and
displace the plastic insulating cover and make resilient permanent
contact with the conductor which is held between the two opposing
jaw members.
The present invention similarly employs resilient bifurcate contact
elements but in addition includes provision for orienting the wire
pair in position to assure the desired interconnection and for
separating the wires prior and subsequent to contact with the
contact element. The invention thereby makes possible the splicing
together of corresponding conductors of the several wire pairs in a
minimum of time, to produce a fully insulated connection.
In the drawing, which illustrates one preferred embodiment of the
invention:
FIG. 1 is a view in perspective of the assembled connector;
FIG. 2 is a top plan view of the jacket member, with a portion cut
away to show detail;
FIG. 3 is a bottom plan view of the cap member;
FIG. 4 is a sectional elevation taken approximately along the
section 4-4 of FIG. 3;
FIG. 5 is a sectional elevation taken approximately along the
section 5-5 of FIG. 2; and
FIG. 6 is a front elevation of the connector as applied to two wire
pairs.
The connector 10 of FIG. 1 comprises an open-top cuplike jacket
member 11 and a cap member 12 fitting therein. An extended front 13
on the jacket 11 is provided with entry ports or channels 14, 15 to
receive the two wire pairs which are to be interconnected. Indicia
such as the marks 16 may be supplied adjacent the entry ports, for
example by printing, embossing, molding, or by covering with a
decal, to indicate the disposition of the wire-connecting structure
within the connector. Typical dimensions for a connector and useful
in connecting two wire pairs having wire sizes of No. 22 to No. 26
or No. 28 gauge may be approximately 0.58 inch in length, 0.52 inch
in width, 0.33 inch in height in the open condition shown in FIG. 1
and compressing to 0.24 inch in height when applied to the wire
pairs as shown in FIG. 6. The base and top are constructed of
resiliently rigid polymeric insulating material, a preferred
material being Lexan polycarbonate resin. A clear transparent resin
may be used, thereby permitting a view of the completed connection,
or the resin may e.g. be pigmented with colored powders, or blended
with flame retardants, or otherwise modified. A high degree of
rigidity is desired, but sufficient resiliency is required to
permit snap closing of the connector body.
The jacket 11 is shown in FIGS. 2 and 5 to be in the shape of an
open-topped rectangular cup, the extension 13 forming a handle. The
bottom of the cup is deeply longitudinally grooved between the end
walls to provide grooves 17, 18 and transversely slotted to provide
discontinuous slots 19, 20. Elongate recesses 21, 22 are provided
adjacent the sidewalls for a purpose to be described and additional
cavities are provided wherever suitable, for reducing the thickness
of the section and thus to help in preventing shrink marking.
Extending along the bottom of the cup or jacket 11 from the bottom
surfaces of the wire channels 14, 15 are rounded wire-supporting
surfaces 25, 26, 27, 28. The inner surfaces are separated by a
central barrier wall 29; the inner and outer surfaces are separated
by the grooves 17, 18. The transverse slots 19, 20 are of the same
depth as the grooves, as shown in FIG. 5, and extend in each
instance from one groove to the adjacent elongate recess and from
the other groove to and partly through the central barrier
wall.
The twin circle wire channels 14, 15 flare outwardly to provide
wire-accepting flared openings 31, 32. The two circular openings of
the wire channels are separated by lower ridges 33, 34 and opposing
upper ridges 35, 36. The space between upper and lower ridges is
just sufficient to permit entry of the connecting web of a wire
pair, the two insulated wires then fitting within the circularly
cross-sectioned portions of the wire channels. FIG. 6 illustrates
the position of a set of wire pairs 37, 38 in the channels 14, 15
respectively.
The inner surfaces of the walls of the jacket 11 are slightly
flared inwardly to a broken peripheral peak line 39 of minimum
diameter, thereby providing for a snap fit with the cap 12.
The cap 12 in FIG. 3 is seen inverted from its normal position atop
jacket 11 as shown in FIG. 1. The thus exposed inner surface is
provided with sharp-edged ridges 41, 42 which fit snugly between
the end walls and within grooves 17, 18 respectively of jacket 11.
Transversely of the ridges are located contact members 43, 44, the
member 43 being further shown in FIG. 4. Each contact member
consists of two resilient doubly pointed slotted or bifurcate
contact elements 45, 46 joined by a connecting bridge 47 which is
embedded in the plastic cap and is firmly retained by the sharp
projecting corners 48, 49. The slots 50, 51 of contact member 43
are aligned with the position of the wire ends on the
wire-supporting surfaces 25, 27 when the cap is placed on the
jacket 11. Similar considerations hold for contact member 44.
Elongate ridges 54, 55 extend outwardly from the side edges of the
cap, and analogous extensions may if desired be provided centrally
of the end edges. All four edges of the cap are slightly flared
outwardly to form a broken peripheral peak line 56 of maximum
diameter. In the open position shown in FIG. 1, the ridges 54, 55
fit below the peak line 39 of jacket 11 and retain the cap against
accidental displacement. The ends of the ridges 41, 42 fit against
the end walls of the cap to further stabilize the connector in the
open position.
In making a connection, the two wire pairs 37, 38 are thrust
endwise into the wire channels 14, 15, which action tends to remove
any minor curvatures in the wire ends. The wire pairs are further
guided by the edges of the ridges 41, 42 centered between the sharp
longitudinal edges of the wire-supporting surfaces 25--26 and
27--28 respectively. When the wire pairs are fully inserted, the
cap is forced into the closed position, with its top flush with the
edges of the cuplike jacket as seen in FIG. 6. The closing
operation is conveniently performed with conventional parallel jaw
hand-operated pliers. The sharp-edged ridges 41, 42 cut through the
plastic central connecting web of the wire pairs, forcing the
individual insulated conductors into position on their respective
wire-supporting surfaces. The upturned sharp edges of the
wire-supporting surfaces deflect the separated wires into their
intended positions. The bifurcate contact elements then further
center the wires, penetrate and displace the insulation, and make
permanent resilient contact with the conductor. The ridge 56 snaps
past the ridge 39 only on application of force sufficient to assure
proper separation of the wires and application of the contact
elements. The ridges 54, 55 are received in the recesses 21, 22
respectively. The ridges 41, 42 and the wall 29 serve to isolate
the several wires and to assure that electrical flashover between
unconnected wires is prevented.
It will be apparent that the structure may be laterally extended to
accommodate additional wire pairs the individual conductors of
which may then be connected in any desired order or combination.
Another modification involves lowering of the end walls and removal
of the upper half of the extension 13 in alignment with one or more
of the wire pair positions, thereby permitting one or more of the
wire pairs to be inserted in the connector at a location
intermediate the ends of the wire pair, i.e. to produce a tap or
bridged connection. In such configuration the wall segments and the
upper portion of the front extension may be incorporated in the cap
structure so that the ability of the connector to completely
contain the connection area may be preserved. In a further
modification a wire-receiving extension may be placed at each end
so that wires or wire pairs may be introduced from opposite
directions; and various other structural modifications and
combinations may be made. Partially filling the connector with an
insulating waterproof paste, e.g. silicone grease, prior to
assembly renders the final connection water resistant without in
any way decreasing the effectiveness of the electrical
connections.
An incidental advantage of the structure illustrated in FIGS. 2--5
is that the cap 12 is symmetrical and may be placed with either end
toward the wire-entry end of the cup 11. The extended sidearms 54,
55 retain the cap firmly in the open position, and the structure is
further stabilized by contact between the ends of the sharp-edged
separators 41, 42 and the end walls of the cup. There is provided
an easily assembled, well-stabilized connector with which permanent
safe connections between wires or wire pairs may easily and quickly
be made.
* * * * *