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Патент USA US2134204

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Oct. 25, 1938.
' F_ 5‘ REGIS
Filed Jan. 26, 1935
“15;; 41
ADO-'0.’ g.
' FELIX S “Pas/‘s.
Patented Oct. 25, 1938
~ 2434x204.
Felix s. Regis, Chisholm,
Application January 26, 1935‘, Serial No.3,58'6 '
2 Claims. (Cl. 173—343)
This invention relates generally to attachment
In the plug base as found on the market there
plugs whereby the feed conductors leading to are two oppositely disposed cut-out portions or
electrically operated devices such, for example, as channels, rectangular in shape, as indicated at
vacuum cleaners, lamps, irons, toasters, etc., may 5, and for the purposes of my invention I have
5 be brought into electrically connected relation cut out two other similarly shaped and slightly 5
with the terminals of a supplemental device, or enlarged oppositely disposed portions as indicated
with a floor, baseboard or wall receptacle con
at 5; they lying in a plane at right angles to the
nected with a source of electrical energy.
channels 5 these being each a continuation of the ~ I
More particularly the invention relates to an
m attachment plug base and may form an integral
part of a wall receptacle into which the prongs of
a plug-cap on the end of the wire leading to an
electrical appliance may be inserted for establish
ing the electrical contact.
smaller rectangular opening 1 in the face of the
plug base providing entrance passageways for the 10
prongs of the cooperative plug-cap, a fractional
portion of said prongs being indicated at 8 in
Figure 1.
Within one of these openings 6 I have installed
In the use of such attachment plugs the rigid
contact elements are sometimes held by the
spring terminal strips of the supplemental plug
base members in a loose manner, thereby cutting
off electrical contact, or the spring tension after
30 considerable use weakens so that the plug cap is
easily and many times accidentally Withdrawn,
which is very inconvenient in the case of the op
eration of a washing machine, vacuum cleaner, or
the like, as the operator then has to stop work
2;, and make the connection again, or in most cases
replace the plug itself.
Therefore it is the principal object of my pres
ent invention to provide a plug cap receptacle
which is provided with a constant spring tension
a contact plate 9, one endofwhich is turned over 15
at right angles forming a flange I!) which over
laps and rests upon the end of the body portion,
and the other end of the contact plate is flared
outwardly for convenient guidance of the
prongs 8 when inserted and frictionally engaged 20
therewith. In the other opening 6 there is in
stalled a somewhat similar contact plate ll, one
end of which is also turned over at right angles
forming a ?ange l2 which rests upon a stepped
section of the body portion and extends to and 25
makes an electrical contact with the rivet 4.
About the rivet 4 and within the cap 3 there is
provided a sleeve l3, which also has av ?ange
about its lower end making contact with the
30 and which will hold the prongs of the plug cap in . flange l2 to further insure a positive connection. 30 v
engagement therewith as against all normal The other end of this contact plate H is also
strains, but of course will permit of the with
?ared outwardly for convenience in inserting the
drawal of the plug cap whenever desired.
prongs 8. Behind each contact plate 9 and II
In the drawing, which accompanies and forms there is an insulating block l4, each of which
to {it part of this speci?cation or disclosure and in
may yield horizontally in the cut-out portions 35
which like numerals of reference denote corre
6 su?iciently for the contact prongs 8 to engage
sponding parts throughout the several views:
the contact plates 9 and II between‘them and
Figure 1 is a vertical sectional view illustrat
the body portion, and, so that this frictional con
ing an attachment plug base embodying the in
tact may be greater and positively establish an
40 vention.
electrical connection, I have installed the con- 40
Figure 2 is a transverse section taken on the tractile spring l5 about these insulating ‘?ller
line 2—2, Figure 1.
blocks I4 and which of course constantly urges ’
In external view my invention resembles any
standard make of plug base and comprises the
. 5 generally circular body portion I, about the outer
approximate half of which is the circular metal
contacting plate 2, having the usual screw thread
ed portion pressed therein as clearly indicated
in Figure 1 and by means of which my plug base
50 is screw threadedly applied to any attachment re
ceptacle. A cap or end piece 3 is held on the end
of the base by means of the rivet 4 which passes
through aligned axial holes in the body portion
and‘ cap and holds the several parts of my devic
55 together.
the contact plates inwardly.
The ends of the
spring l5 are turned inwardly about the corners
of one of the cut-out portions 5, and there is an 45 . ~
inwardly bowed portion I6 of the spring which
extends within the other cut-out, portion 5, which
are simply to prevent rotation of thespring.
While I have illustrated the invention as ap
plicable speci?cally to an electrical plug-base, it 50
is obvious that the same may be applied with
equally satisfactory results to any ?oor, base
board, or wall receptacle with but slight modi?ca
From the above it will be apparent that I have 55
.2 1
‘provided an electrical plug base, or appliance,
which will positively insure an electrical connec
tion when the prongs of a cooperative plug cap
are inserted therewithin, and which connection
will remain closed as against all accidental
Having thus described my invention, what I
claim and desire to secure by Letters Patent, is:
1. The combination with an electrical plug
base having an axial body portion with opposed
vertically disposed channels in opposite outer
sides of said axial portion, of similar opposed
channels lying in a plane mutually at right angles
to that of said ?rst mentioned channels, contact
against rotation - within said ?rst mentioned
channels and engaging said blocks for holding
them tightly against said blades.
2. An electrical plug base of the class described
comprising a body portion having opposed ver
tically disposed cut-out portions upon opposite
sides of said body portion,_ and openings therein
lying in a plane mutually at right angles to that
of said cut-out portions for insertion of prongs
of a cooperative plug cap, contact plates within 10
said openings, a laterally movable insulator with
blades yieldably mounted within said last men
in each cut-out portion and contacting said plate,
and resilient means cooperatively held against
rotation within said cut-out portions and engag
ing said insulators for holding them tightly 15
tioned channels, laterally reciprocal insulating
against the contact plates.
blocks within said channels and contacting said
blades, and resilient means cooperatively held
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