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Патент USA US2118857

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31, 1938.
Filed Nov. 14, 1953
2,1 18,857
Patented May 31, 1938
Walter C‘. Morford, Los Angeles, Calif.
Application November 14, 1933, Serial No. 697,933
3 Claims. (01. 173-343)
This invention relates to improvements in at
Figure 2 is a top plan view of the female plug
tachment and wall plugs and has for its object section,
to provide a simple, e?lcient and inexpensive de
Figure 3 is a bottom plan View of the female
vice of this character.
plug section,
One of the objects of this invention is to pro
Figure 4 is a bottom plan view of the male sec- 5
vide an attachment plug the sections of which
may be more quickly and conveniently interse
cured one upon the other.
Another object of this invention is to provide
10 an attachment or wall plug with a male‘and
female section so shaped, designed and construct
ed as to permit ready insertion of one section into
the other with a minimum of time and exertion
whereby a true electrical contact may be main
tained between both sections at all times.
A further object of the present invention is to
provide an attachment plug of two sections de
signed to be interengaged detachably in such a
manner that a good electrical contact is made
immediately when thetwo sections are secured
one upon the other.
A still further object of this invention is to
provide an attachment or wall plug with means
for quickly securing the electrical wires upon the
male section and efficiently without the hazard
of the wires becoming shirred accidentally.
Another important object of this invention is
to provide an attachment plug with a more rapid
manner of assuring that the two sections may be
30 interengaged electrically than is true of conven
tional plugs due to the circumstance that the
construction of the inter?tting parts of both sec
tions is such that even in the dark they may be
interconnected without a hit-and-miss repeated
trial effort.
A ?nal object of this invention is to provide
an attachment plug of a male and female section
where the female section has a central bore and
counterbore while the male section has a central
40 rod with a forwardly projecting pin for respec
tive insertion into the counterbore and bore of
the female section, there being no loose contact
members in the female part or in the male part
of the attachment plug likely to cause trouble due
45 to short-circuiting.
With the above and other objects in view my
invention consists in the combination, arrange
ment and details of construction disclosed in the
drawing and speci?cation, and then more par
ticularly pointed out in the appended claims.
In the drawing, in which similar reference
characters designate similar parts throughout the
respective views,
Figure 1 is a vertical sectional elevation of my
tion of the invention,
Figure-5 is a front view of the female section,
Figure 6 is a top plan view of the male section,
Figure 7 is a side elevation, partly broken away
of the male section to a different scale than Fig- 10
ure 1,
Figure 8 is a side elevation of the male section,
on a still different scale,
Figure 9 is a longitudinal section taken through
a portion of the male section showing how the 15
same is cut away for receiving the electrical con—
tact members.
Referring to the drawing, which is merely illus
trative of my invention the various parts are now
detailed. The attachment plug consists of a male 20
section 22, and a female section Hi. This female
section consists of a porcelain or insulator body
tapering as at H at one end, and it is formed
peripherally with a series of threads upon which
is screwed a brass collar !2.
The body, towards 25
its opposite end ?ares as at 83, which has a trans
verse flat portion is see Figure 5 upon diametri
cally opposite points of which are located notches
or recesses l5.
The female section it is formed with a central 30
bore I6 and with a counterbore extension thereof
designated I ‘i. A contact post or rod l 8 ?ts snug
ly and projects partially into the outer end of
the bore I6, and has a tapered tip end project
ing beyond the tapered portion l i of the body ll]. 35
There is a contact member 20 which extends
transversely into the interior of the insulator
body Ill.
The inner end of the contact member 2!] curves
slightly downwardly into the counterbore ll, 40
while its outer end may be secured as by means
of solder Z! to the brassthreaded collar l2.
The male section may also be made of porcelain
and of non-metallic material, and it consists of
the forwardly projecting integral cylindrical rod 45
23 formed with a reduced stem or cylindrical pin
24, so that an annular shoulder exists between
the outer end of the rod and the inner end of the
integral pin thereon. Also centrally disposed in
the male body 22, which has an inner part ex- 50
tending transversely as a ?at portion and an
outer part formed convex, is a socket 26 extend
ing along the axis of the male section. The inner
end of this socket 26 communicates by means of
the oppositely-arranged and diametrically op- 55
posed vertical slots M and N with diametrically
opposite notches or recesses 21 formed so as to
open out of the inner ?at portion of the section
22, these notches ?anking the base of the rod
which, at this point, is formed integrally upon
the male plug section.
Arranged in concealed relation centrally of the
rod 23 and the pin 24 is a contact strip 28 whose
lower angular portion or terminal 29 extends lat
erally outside the rod and extends into the recess
21 on one side of the rod.
There is a collector
ring 36 embracing the pin 24 and seated on the
annular shoulder formed by this rod with the
pin, this ring having the same outside diameter
15 as the rod itself. There is another contact strip
30 countersunk into the peripheral surface of the
rod 23, and having its upper end electrically con
nected to the collector ring 35, while its lower
angular terminal extends laterally of the rod 23
20 and projects into the other notch or recess 21.
will be seen from Figure 9 that there is a center
passage 32 made to receive contact member 28
so that the angular passage o?set 31 will receive
the angular o?set 29 of this contact member.
25 Similarly the groove 33 formed upon the side of
the rod 23 receives the contact member 30.
A flexible cord consisting of the parts A and B
enters the bore 26 of the male section 22 and car
ries the opposing shirred wires 34, which extend
30 in opposing directions so that the wires may have
‘ ?at contact with the under sides of the contact
member terminals 29 and 3| respectively, so that
now the binding screws 35 may be screwed home
tightly to clamp the wires against the terminals
35 29 and 3| in the notches 21. In this manner the
wires are concealed from view and cannot be
come easily frayed or abused so as to cause any
short connection or short circuit condition at all.
It will be seen that since the rod 23 is of a
slightly larger diameter with respect to the pin
24, that the pin will quickly enter the counter
bore ll of the female section II], loosely, and
once it so enters it will enable the rod 23 to
quickly enter the counterbore and now the oper
ator does not have to be careful to assure that
the contact will be made, as in any circular posi
tion in which the rod and pin maybe disposed
in their respective counterbore and bore of the
female section [0, electrical contact will be
made. The contact strip 28 will contact the con
50 tact member l3, while the contact member 20 of
the female section will engage the collector ring
36 in any points of its peripheral circumference,
and since there is a good electrical connection
made in the recesses 21 between the terminals
55 of the contact strips which supply current to
contact rod 18 and collector ring 36, a positive
action is made for the abutting contact members.
When the male section is forcibly detached
from the female section the electrical contacts
are broken and the circuit is disrupted. It will
be seen that spring clips H have base portions
secured by the fasteners K to the male section
22, these clips being curvilinear portions that will
snap automatically into the annular groove or
opposing notches I5 formed upon the female
section ID to assure that the ?at inner parts
of both sections are in ?rm contact. I do not
con?ne myself to the exact details of construc
tion herein disclosed but cover all variations
falling within the purview of the appended
What I desire to claim and seek by Letters
Patent is:—
1. An attachment plug consisting of a female
and a male plug section of insulating material, a
threaded metal collar carried externally by said
female section, the latter having a cylindrical 15
bore, a contact rod in said bore having a tip
plugging one end of the female section, the male
section having a forwardly projecting cylindrical
rod designed to snugly enter said bore, a contact
strip embedded in said rod and designed to abut 20
the contact rod, a collector ring ?tted circum
ferentially around said rod, a contact member
embedded’ in the female section abutted by the
collector ring when the rod ‘is in the bore, said
contact member being soldered onto the threaded
collar, and means located in the male section
for conducting current to said collector ring and
to the contact strip in said rod.
2. An attachment plug consisting of a female
and a male insulator plug section, the female
section having a brass threaded collar enclosing
same externally and having a central bore, a
contact rod in said bore, a contact member sol~
dered at one end to said collar and penetrating
the female section to provide a contact member,
the male section having a rod projecting there
from, a collector ring carried by said rod for
engagement with said contact member elec
trically, means detachably securing the male sec
tion upon the female section and for seating the 40
rod in the bore of the female section, a contact
member embedded in said last-named rod de
signed to engage the contact rod of the female
section, a ?exible cord projecting into the male
section and having electrical wires, and means
in the male section whereby the electrical wires
from said cord are caused to convey current to
the collector ring and to the contact member.
3. As a new article of manufacture a male at-v
tachment plug section having a bore provided
with diametrically opposite arcuate co-axial
slots, and with diametrically opposite recesses
communicating with said slots, there being an
integral cylindrical rod between both recesses
projecting at right angles thereto concentrically
of the plug, terminating in a concentric for
wardly projecting pin, said rod having a co
extensive longitudinal groove and said rod and
pin conjointly having a longitudinal central hole
internally curving out of the side of the rod at 60
its innermost part.
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