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Патент USA US2406144

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Aug. :20, 1946-.
w. P. HERMAN‘
CONTACT BLADE ASSEMBLY
_
2,406,144
I
V
'
Filed June 14, 1941
‘ INVENTOR
ATTORNEY
,
Patented Aug. 20, 1946
2,405,144
UNITED STATES PATENT OFFICE
2,406,144
CONTACT BLADE ASSEMBLY
William P. Herman, Providence, R. I.
Application June 14, 1941, Serial No. 398,098
1
A
2 Claims.
My present invention relates to the manufac
ture of electrical contact plugs and has particular
(01. 173-361)
2
trating my invention, and particularly Fig. 1
thereof, the contact blade illustrated is prefer
ably stamped in one, ?at, integral piece. The
reference to a novel construction of contact blades
and novel methods of assembly of the contact
blade comprises the conventional contact por
blade with the electric cord.
U! tion 32, the intermediate self-anchoring portion,
This application is a continuation in part of
my copending application Ser. No. 188,262, ?led
February 2, 1938, and entitled Contact plug as
sembly, issued July 8, 1941, Patent No. 2,248,082.
It is the principal object of my invention to pro
vide a contact blade which'is ?rmly attached to
the cord lead wire against pulls and abnormal
and the upper cord receiving portion.
The upper cord receiving portion of the blade
32 is provided with a transverse slot 33 adjacent
to its upper end, and a second transverse slot
34 below the slot 33 and extending from the
opposite edge of the blade 32. The slot 34 pref
strains.
erably extends inwardly from the blade edge at
It is an additional object of my invention to
provide a contact blade which can be so attached
a slight upward angle so that tension or pull on
to the end of a cord lead wire as to provide a
the cord lead wire will tend to slide the wire into
the slot rather than outwardly.
The blade 32 may be soldered or spot welded
to the lead wire. The bared end 35, of a cord
35, is attached to the upper edge of the blade
Laboratories.
Another object of my invention is to provide 20 32, either by soldering or welding, as shown in
Fig. 2. The wire is then passed through the slot
various methods which will facilitate the secur
33, back through the slot 34, see Fig. 3, and then
ing of cord lead wire to the contact blade, which
reentrantly bent into the position shown in Figs.
are easy and economical to practice, and which
4 and 5 ready for assembly.
will facilitate assembly of the ?nal plug.
This construction provides a strong relief
With the above and other advantageous fea 25
against stresses and strains. Any strain on the
tures in View, my invention consists of a novel
cord is taken up by the convolutions of the insu
arrangement of parts, and novel methods of
lated portion of the conductor through the slots
manufacture and assembly, more fully disclosed
of the blade and very little of the strain is trans
in the detailed description following, in conjunc
tion with the accompanying drawing, and more 30 mitted to the bared contact portion.
While I have described a speci?c constructional
speci?cally defined in the claims appended hereto.
embodiment of my invention, and a Speci?c meth
In the drawing,
od of assembly, it is obvious that changes in the '
Fig. l is a perspective view of a self~anchoring
size and shape of the parts, in their. relative ar
contact blade embodying my invention;
rangement, and in the method of assembly, may
Fig. 2 is an edge view thereof with the cord
be made to suit the requirements for di?erent
lead wire inserted therein preparatory to solder
strain relief which will withstand much more
than the minimum required by the Underwriters
plug designs, without departing from the spirit
111%;
Fig. 3 is a similar View, the cord lead
passed through the second slot after
Fig. 4 is a perspective view of the
cord soldered and ready for assembly;
and the scope of the invention as de?ned in the
wire being
appended claims.
soldering;
I claim:
blade and 40
1. In combination, a contact blade for an elec
Fig. 5 is a plan view thereof.
In the manufacture of electrical contact plugs,
it has been found desirable to eliminate the use
of screws, clamps, or other outside anchoring 45
means. It is therefore necessary to provide a
blade and cord lead connection which affords
a positive electrical contact of su?icient strength
to meet the requirements of the Underwriters’
Laboratories. While the present invention may 50
be applied to any type of blade, for the purposes
of illustration I have shown the invention as ap
trical contact plug comprising a flat, one-piece,
rigid stamping of generally elongated form and
having two spaced transverse slots extending in
wardly from opposite side edges adjacent the
upper portion of said blade, the lower slot ex
tending inwardly at an upward angle, and an
insulated cord lead wire having its bared end
?xed to one side of said blade adjacent the upper
slot and extending upwardly above the upper slot,
said insulated wire passing alternately through
the upper and then the lower slots and being
bent to extend upwardly in alignment with said
plied to a self-anchoring blade having intermedi
blade.
ate shoulders for interlocking with a plug slot.
Referring more in detail to the drawing illus 55 2. In combination, a contact blade for an elec
trical contact plug comprising a flat, one-piece,
'~
p
7
3
~
2,406,144
‘
rigid stamping of generally elongated form and‘
having two spaced transvers slots extending inwardly from the side and adjacent the upper
portion of said blade, and an insulated cord lead
‘ (wire having its bared end ?xed to one side of said 5
blade adjacent the upper slot and extending up-
r
"
4
wardly above the upper slot, said insulated wire ,
passing alternately through the upper and then
the lower slots and being bent to extend upwardly
in alignment with said blade.
.
WILLIAM P. HERMAN.
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