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Патент USA US2115642

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April 26, 1938.
E. MARTIN
’
ELECTRICAL CONDUCTOR TERMINAL CAP
Filed Aug. 5, 1929
2,115,642
2,115,642
V Patented Apr. 26,1938
' UNITED STATES PATENT OFFICE
2.115.642
eu'zcrmcsr. oonnuc'roa TERMINAL cAP
Earl Martin, Chicago, Ill., assignor to George H.
_
Glade, Jr., Chicago, Ill.
I
,
Application ‘August 5, 1929, Serial No. 383,537
13 Claims. (Cl. 173-9361)
This invention relates to electric conductor " introduce the blades. the notch 4” at the end of
terminal caps, particularly of the type used in the part 4“ of each blade is straddledover a
making connections for, electric utility devices ' corresponding wire and forces it into its corre
' such as‘ ?oor lamps,‘ wash machines, toasters and sponding cavity 2“ of the cap 2; the wires thus
assuming the formation shown ‘in Fig. 6. The 6
5 other portable devices. _
,
dimension of the cavity 2* is such as to accom- ~
One of'the objects of the invention is to pro
'modate the thickness of the part 45 of the blade,‘
duce a terminal cap consistingfof few parts.
Another object 01' the invention is to produce and to cause close'and suiiicient contact between
the blade and the wire, and needing no further ’
a terminal cap of simple design.
10
Another object of the invention is to produce bond for reliably conducting the current 'from one 10
- , to the other.
a terminal cap of sturdy construction. .
Another object of the invention is to produce
a terminal cap that permits of the wire ends being vconnected thereto in a secure and reliable
15 manner.
>
,
\
‘Another object of the invention is to provide
a terminal cap of the character described, that
permits 01' the wire ends, being secured in good
electrical contact with the blades, without the
'20 use-oi solder o1" auxiliary‘mechanical devices.
Another object of the invention is to provide
a terminal cap for conductors, having blades
projectingtherefrom and cooperating therewith
to provide a substantial and reliable connection
25 of said blades to the cap members and to the
conductors.
\, ,
.
.
Another object of the invention is to attain
those ends and other‘ objects which will be point
ed out in the claims.
30
'
In the drawing, in which a ‘commercial embodiment- of the invention is shown‘:——-.
Fig. 1 is a side elevation of the device.
Fig. 2 is an end view thereof.
,
3
'
part 4a and these notches preferably form pro
jecting barbs 4° so that when driven into the
cavities 2L4“ of the cap these barbs become 15
imbedded in the material of the cap and tend to
resist withdrawal thereof.
,_
- _
' These barbed ends are forced into the cavities
of the cap until the bent portions 4‘1 of the blades
encounter the bottom of the grooves 2b-2b and
are stopped thereby; these grooves 2” further act
to securely retain the blades in parallelism.
.
The blades 4-4 are made of suitable electrical ,
conducting material, and the cap body is made
of any suitable insulating material, such as semi- , 25
hard rubber, ?bre or any other substance which
will lend itself readily in the construction of this
device.
It will of course be understood that due to the
comparative stiffness of the blades 4--4 and the 30
convenient shoulder 4d the blades may be formed
without the prongs 4c and driven into the open
ings 2a being frictionally held therein. This has
Fig. 3 is an axial section taken as indicated at
the line 3-3 of Fig. 2.
Fig. 4 is an end view of the cap alone, wit ‘
the blades and wires omitted.
..
The blades 4 are notched at'the edges of the .
-
- Fig. 5 is a perspective view of onev of the blades.
Fig. 6 is a view showing how the wire is formed
40 when assembled‘ in position.
In Fig. 1 the cap 2 is shown as attached toa
cooperating plug 3 which has scggrsthread con
nections with a socket or outlet , which may be
understood as indicating a source of electric cur
as G! rent to be conducted by the cable D.
The cable D is inserted in the bore 3 of‘ the
cap member 2, and the wires l--.l of the cable
are separated and spread in opposite directions,
and made to contact with blades 4-4.
50
In assembling the blades 4-4 and the cap 2, it
_ will be understood that suitable tools or devices
are employed for holding the blades in proper
position while driving the ends 4°~---4a thereof
into the cavities 2**—2a of the member 2.
a 55
Having spread the wires 1-! in readiness to
been found a very effective way to hold the prongs
‘in place particularly when the'cavities 2“ are 35
formed slightly smaller than the width of 2.
prong and the wire I.
'
It will be noted that this construction provides
vmeans for connecting the two wires to the blades
or terminals, and the blades may be connected 40
to the cap and the wires without the use of any
auxiliary devices such as screws, rivets or other
expedients.
_
~
'
It .will be understood that many changes and
modi?cations may be made without departing 45
from the spirit of this invention.
I
claim:
'
,
h
'
,
1. In a device of the character described hav
ing a. one-piece cap body and blades, said body
having an opening therethrough, insulated con- '50
ductors therein with the ends thereof bent apart
at one end of said opening and bared of insu
lation, spaced cavities in said body near said end
within which cavities said'blades are driven, said
bared ends being electrically connected to said 55
2
2,115,042
blades, and means formed integral with the blades
and located within said cavities to grip the walls
thereof and secure said blades against with
drawal.
2. In a device of the character described in
cluding contact blades and a body member for
mounting the same, said body member composed
of resilient material and having cavities therein
into which said blades are driven to assemble the
same, said cavities constituting means for mount
said base from the side opposite that through
which said conductors enter, each of said prongs
having a portion too large for ready insertion
in, the corresponding hole but forced into said
hole to secure the prong in position and prevent
withdrawal, the outer portions of said prongs
extending in the direction ?rst mentioned, a re
cess extending from the open end of each hole to 1
said passageway, the ends of said conductors ex
tending in opposite directions in said recesses and 10
ing the said blades in the said body member, the frictionally held between said forced-in portions
portion of the blades occupying the cavities hav
of said prongs and the walls of the holes to secure _
ing barbs formed thereon to secure same in posi
said conductors in good electrical contact with
tion and prevent withdrawal thereof.
said prongs.
_
15
3._In a device of the character described in
9.
In
a
plug
construction,
the
combination
of a
cluding contact blades and a body member for
mounting the same, said body member composed plug body formed of insulating material and hav
of resilient material and having cavities therein ing a recess in the face at one end and an axial
into which said blades are driven to assemble the bore extending from said'recess through.’ said
body, insulated conductors entering said bore at
same, said cavities constituting means for mount
ing the said blades in the said bodymember, the : vthe other end of said body and extending there 20
.through, and a pair of substantially parallel blade
portion of the blades occupying the cavities hav
ing barbs so formed thereon that the blades may members each having a pressed at in a cavity
extending inwardly from said recess near the exit
be more readily entered than withdrawn, but se
end of said bore, the ends of said conductors
curely held against accidental withdrawal.
4. An electrical ?tting comprising a body of being bare and each end extending along the side 25
non-frangible insulating material having parallel of one of said blade members and folded around
prong receiving openings and sheet metal mem— the same to engage ‘the other side also, said
bers having barbed prongs of a thickness equal to folded ends being compressed between the walls
the thickness of the sheet and of a width slightly of said cavities and said blade members,‘to estab
greater than the diameter of the holes, the prongs lish mechanical and electrical connection there
being incapable of easy insertion into the open- '
ings but capable of being forced into the same,
‘the barbed prongs being effective to resist re
moval.
-
5. An electrical fitting comprising ,a body of
non-frangible insulating material having a face
and two spaced holes extending inwardly from
the face, and metallic members having prongs
40 forced into the holes, the sides of the prongs
having laterally extending projections which en
gage the walls of ‘the holes and resist removal.
8. In a device of the character described in
cluding contact blades and a body member for
with.-
~
10. In a plug construction, the combination of
a plug base of insulating material having a'recess
in the face at one end and having an axial bore
extending from said rebess through said base, in
sulated conductors entering said bore at the other
end of said base and extending therethrough, a
pair of substantially parallel blades, the inner
portions of which fit within a pair of substan
tially parallel openings in said base, said open
ings being spaced on opposite sides of said bore
and communicating with the outer end thereof
by means of said end recess, said blades having
mounting the same, said body member being com 'notches in the inner ends thereof, said conduc~
posed of insulating material and having cavities tors being bent apart and positioned in said end
recess and having the ends thereof bared and
therein into which said blades are forced to as
semble the same, said cavities constituting means each bent to follow the said inner portion of a
for mounting the said blades in the said body blade along one side, through said notch, and
member, the portion of each blade which occupies back along the other side, and clamped against
a cavity having a barb formed thereon to secure said blade by the wall of the opening, to main
same in position and prevent withdrawal thereof. tain eifective electrical and mechanical contact
7. An attachment plug cap comprising contact therewith.
11. In combination, a one-piece, molded at
prongs and a preformed supporting base therefor
having a passageway therethrough into which
conductors may be led in one direction for con
nection with said contact prongs, a pair of prong
receiving holes arranged on each side of said pas
sage-way and extending inwardly but not through
said base from the side opposite that through
which said conductors enter, each of said prongs
having a portion too large for ready insertion
in the corresponding hole but forced into said
hole to secure the prong in position and prevent
withdrawal, the outer portions of said prongs
extending in the direction ?rst mentioned, and
the ends of said conductors being secured in good
electrical contact with said prongs.
8. An attachment plug cap comprising contact
70 prongs and a preformed supporting base therefor
having a passage-way therethrough into which
conductors may be led in one direction for con
nection with said contact prongs, a pair of prong
receiving holes arranged on each side of said pas
sage-way and extending inwardly but not through
tachment plug of. insulating material, having a
longitudinal opening therethrough, a pair of sub 56
stantially smooth bore recesses in one end of said
plug extending into but not through the same,
and arranged on opposite sides of said longitu
dinal opening substantially parallel thereto, con
tact blades having their inner portions within
said recesses, said portions having a transverse
dimension in excess of that required for a sliding
fit, whereby said blades are assembled by forcing
the same into said recesses thereby gripping the
walls thereof to maintain the assembled relation,
said plug having a transverse groove in the outer
end, connecting the outer ends of said recesses
with the outer end of said longitudinal opening,
to receive and partially enclose conductors led in 70
from the opposite end of said longitudinal open
ing and extending to said blades.
12. In a device of the character described in
cluding contact blades and a body member for
mounting the same, said body member being com 75
3
‘ 2,115,642
posed of insulating material and having cavities
therein into which said blades are pressed to
assemble the same, said cavities constituting
means for mounting the said blades in the said
body member, the portion of each blade which
occupies a cavity having a barb formed thereon
to secure the same in position and prevent with
drawal thereof, and conductors each having a
bared end positioned in one of said cavities in
good electrical contact with the corresponding
blade.
13. An attachment plug cap comprising con
tact prongs and a preformed supporting base
therefor having a passageway therethrough, con
ductors in said passageway, a pair of prong-re
ceiving holes arranged on each side of said pas
sage-way and extending inwardly but not through
said base from the side opposite that through
Which said conductors enter, each of said prongs
having a projection thereon with an inclined face
sloping in a direction to facilitate insertion but
not withdrawal of the prong from the corre
sponding hole, said prongs having portions seated
in said holes with other portions extending out
wardly, a recess extending from the open end of
each hole to said passageway, the ends of said
conductors extending in opposite directions in
said recesses and frictionally held against said
seated portions to secure said conductors in good
electrical contact‘with said prongs.
EARL MARTIN.
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