U.S. patent number 3,845,236 [Application Number 05/447,478] was granted by the patent office on 1974-10-29 for wire connector.
This patent grant is currently assigned to Minnesota Mining and Manufacturing Company. Invention is credited to Gail A. Anderson.
United States Patent |
3,845,236 |
Anderson |
October 29, 1974 |
WIRE CONNECTOR
Abstract
A wire-connector adapted particularly for connecting tap wires
to run wires, e.g., in strip lighting applications, employs a
folded slotted spring compression reserve contact element in a
wire-supporting grooved covered insulating body having an open
inspection port and provided with a ribbed outer surface permitting
final closure using either parallel jaw or angular jaw pliers.
Inventors: |
Anderson; Gail A. (Saint Paul,
MN) |
Assignee: |
Minnesota Mining and Manufacturing
Company (St. Paul, MN)
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Family
ID: |
27005632 |
Appl.
No.: |
05/447,478 |
Filed: |
March 4, 1974 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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372065 |
Jun 21, 1973 |
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Current U.S.
Class: |
174/88R;
439/389 |
Current CPC
Class: |
H01R
4/2454 (20130101); H01R 43/015 (20130101) |
Current International
Class: |
H01R
4/24 (20060101); H01R 43/01 (20060101); H02g
015/08 () |
Field of
Search: |
;174/88R,84C
;339/97C,98,276R,276T,95R ;29/628,63F |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Clay; Darrell L.
Attorney, Agent or Firm: Alexander, Sell, Steldt &
Delahunt
Parent Case Text
This application is a continuation-in-part of my copending
application Ser. No. 372,065 filed June 21, 1973 now abandoned.
Claims
1. A wire-connector comprising a folded slotted spring compression
reserve contact element slidably retained within an insulating body
having upper and lower body sections opposingly channeled to
receive a pair of insulated electrical conductors, said sections
being hingedly interconnected along their back edges, and a cover
member hingedly connected to said body for fitting beneath said
lower section and across the free front edges of said upper and
lower sections, and wherein said lower section has a flat base
defining a first plane, said upper section having a top surface
defining a pair of planes intersecting at a peak midway above said
channels, the one of said planes extending toward the free edge of
said section being at an acute angle with said first plane.
2. Wire-connector of claim 1 wherein said pair of planes is defined
by a
3. Wire-connector of claim 1 wherein said channeled bottom section
has two parallel channels, a rectangular opening transversely of
said two parallel channels receiving said contact element, and said
opening extending along the inner of said channels to provide
inspection access to said inner
4. Wire-connector of claim 3 wherein said inner channel has a
wire-stop
5. Wire-connector of claim 4 wherein said channeled upper section
has two parallel channels corresponding to those of said lower
section and a series of transverse slots for receiving the ends of
the lobes of said
6. Wire-connector of claim 5 wherein the inner ones of said
channels and the corresponding slots of said contact element are
smaller than the outer ones of said channels and the corresponding
slots of said contact element.
Description
This invention relates to improvements in wire-connectors employing
spring compression reserve contact elements in an insulating body.
In one aspect the invention relates to connectors of particular
utility in the installation of strip lighting facilities wherein a
number of fluorescent light fixture ballast devices having
lead-wires of No. 18, 16 or 14 AWG are to be connected onto a
single No. 12 or No. 14 gauge 600-volt AC supply line. There is
provided a connector which is easily attached using either
conventional electrician's pliers or parallel jaw pliers. The
connector permits inspection of wire-positioning prior to final
assembly, whereby to assure full positive connection.
The present connector is similar in a number of respects to that
described in U.S. Pat. No. 3,388,370, but has a number of
advantages which will be referred to in connection with the
following description and the accompanying drawing, wherein:
FIG. 1 is a view in elevation from the front or open wire-receiving
side;
FIG. 2 is an end elevation from the left of FIG. 1;
FIG. 3 is a top plan view of the connector of FIGS. 1 and 2;
FIG. 4 is a rear elevation of the insulating body of the connector
of FIGS. 1-3 with a portion of the cover removed;
FIG. 5 is a bottom plan view of the insulating body;
FIGS. 6 and 7 are interior plan views of upper and lower sections
respectively of the insulating body;
FIG. 8 is a view in perspective of the folded contact element;
and
FIGS. 9 and 10 illustrate the closing of the connector onto tap and
run wires using angular jaw and parallel jaw pliers
respectively.
As with the connector of U.S. Pat. No. 3,388,370, the present
connector 10 comprises a slotted or grooved resilient or spring
compression reserve contact element slidably insertable within a
wire-supporting insulating body 12 having a foldable cover or cap
member 13. The body 12 has an upper section 14 and a lower section
15, the two being connected along one edge by a narrow web 16
serving as a hinge. The cover 13 also is attached to the lower
section through a hinge 17 and in position to be folded across the
bottom of the lower section and across the free edges of the two
sections. A terminal hook 18 extending along the free edge of the
cover 13 engages with a corresponding lip 19 extending along the
free edge of the upper section when the connector is fully
assembled.
The present connector employs a folded contact element 11 (FIG. 8)
which is inserted in the bottom section 15 through a rectangular
opening 21 (FIG. 5) having an offset 22. The element 11 is slotted
to provide opposing narrow open-ended slots 23, 23a for receiving
wires in the 14-18 gauge range, and wider slots 24 for receiving
wires in the heavier 12 gauge range. The rounded corners of the
legs or lobes defining the wider slots are desirably sharpened or
given a wedge shape so as to more readily pierce the insulative
covering of the heavy wire.
The inner surface of the upper section 14 is shown in FIG. 6 to be
provided with parallel wire-receiving channels 25, 26, with shallow
transverse slots 27, 28, 29 and with a wire-stop 30 extending
across the narrower channel 25 and in line with the outer edge of
the offset opening 22 in the lower section 15. Similarly, the inner
surface of the lower section 15 is shown in FIG. 7 to include
wire-receiving channels 31, 32 and a wire-stop 33 extending across
the narrower channel at the edge of the opening 22 and in line with
the stop 30 of section 14. Both upper and lower sections extend
outwardly beyond the width of the cover to provide increased
channel length and improved insulating capability.
The upper surface of the upper section 14 has a central transverse
ridge or ramp 34 and the upper surface of which is in the form of a
series of parallel longitudinal ribs 35-38, best seen in FIG. 2.
The upper surfaces of ribs 35-37 define a common plane which is at
an acute angle with the plane of the lower surface of the lower
section 15 when the connector is in fully assembled condition. The
upper surfaces of ribs 37 and 38 define a common plane which under
the same conditions is parallel to the plane of said lower surface.
Rib 37, the upper surface of which is common to both planes, will
be seen to be located approximately above the center of the contact
element 11 when the same is inserted in the slotted body 12. A
preferred location is midway between wire-receiving channels 31 and
32.
The contact element 11 is 0.027 inch (0.68 mm.) in thickness and is
made of spring tempered cartridge brass with a thin bright tin
plate covering. Each slotted face measures 0.425 .times. 0.350 inch
(10.80 .times. 8.89 mm.) and the two are spaced 0.126 inch (3.20
mm.) apart. The narrow slot 23 in the inner plate adjacent the stop
33 is 0.020 inch (0.51 mm.) in width; the opposing narrow slot 23a
is 0.023 inch (0.58 mm.) in width; the wide slots are each 0.065
inch (1.65 mm.) in width. The slots are so disposed as to be in
line with the center-line of the corresponding wire-supporting
channels in the body member, and the extended lobes enter the
correspondingly positioned slots 27, 28, 29 in the upper section
when the element is fully inserted.
The body member exclusive of the cover 13 is approximately 0.48
.times. 0.62 .times. 1.04 inch (12.2 .times. 15.8 .times. 26.4 mm.)
in overall dimensions and is made of polypropylene or equivalent
firm resiliently flexible plastic insulating material. The attached
cover is 0.060 inch (1.52 mm.) in thickness, being reduced to 0.013
inch (0.33 mm.) to form the hinge grooves 17. The cover is
otherwise dimensioned to provide a snug fit across the free front
edges of the lower and upper sections of the body.
In use, the run wire 39 is inserted from the open front of the body
into the larger channels 26, 32, and the tap wire 40 is threaded
into the smaller channels from the left end and to an extent
sufficient for the wire-end to contact the stops 30, 33, which may
be determined by visual inspection through the extension opening
22. With the contact element in position in the opening 21, the
connector is then closed by application of forces against top and
bottom surfaces as illutrated in either of FIGS. 9 and 10. With the
pliers 41 of FIG. 9 the downward force is applied against ribs
35-37, whereas with parallel jaw pliers 42 of FIG. 10 the force is
applied against ribs 37 and 38. In each case the element 11 is
driven into spring reserve compression contact with the wires, the
lobes of the element entering the transverse slots 27-29 and the
wires entering the open-ended slots of the element 11. The ridge 34
is sufficiently massive to transmit the force uniformly so that
complete closure is attained in both cases.
The cover is then folded over the inserted element 11 and across
the open front, being retained in the fully closed position by
interaction between the hook 18 and lip 19. Permanent electrical
contact between the conductors is effected, and the contact element
is fully insulatively protected.
An important feature of the invention is the ribbed ramp which
facilitates the full closing of the connector without requiring
specially designed tools. For a connector having the specific
dimensions stated hereinabove, the ribs 35-37 define an angle of
very close to 15.degree. with the bottom of the lower section as
previously identified, and with the plane defined by ribs 37 and
38. Ribs 35-37 are constructed to a radius of 0.07 inch (1.8 mm.);
rib 38 to a radius of 0.158 inch (4.01 mm.). The rib surfaces may
if desired carry a roughened or knurled pattern to avoid any
possibility of slipping of the pliers or other tool, although
smooth surfaces are normally entirely effective since the tool face
itself is ordinarily not smooth.
* * * * *