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Патент USA US2131577

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Sept. 27, 1938.
Filed Oct. 21, 1936
Charles C. Abbott,
byì/wêA‘t torney.
Patented Sept. 27, 1938
Charles C. Abbott, Pittsfield, Mass., assignor to
General Electric Company, a corporation of
New York
Application October 21, 1936, Serial No. 106,847
3 Claims.
(Cl. 173-259)
This invention relates to terminal structures,
more particularly to terminal structures for elec
tric heaters, and it has for its object the provi
sion of an improved terminal structure of this
porting insulators I2 and I3 secured in the end
portions of the sheath. The resistance conduc
tor III is supported in spaced relation with ref
powdered heat refractory electrically insulating 5
While not limited thereto, this invention is
particularly applicable to terminal structures for
electric heaters of the sheathed type wherein a
resistance conductor is mounted in a metallic
110 _sheath and supported in spaced relation with
reference to the sheath by a «compacted mass of
heat conducting and electrically insulating ma
terial; and more especially to electric space or air
heaters of the type described and claimed in my
15 United States Patent No. 1,904,594, dated April
18, 1933.
'I'his invention contemplates an improved ter
minal structure which has a simple, rugged and
relatively inexpensive construction.
For a more complete understanding of this in
vention, reference should be had to the accom
panying drawing in which Fig. 1 is a fragmen-.
tary plan view of an electric heater provided with
terminal structure embodying this invention,
25 parts being broken away so as to illustrate cer
tain details of construction; Fig. 2 is a fragmen
tary elevation of the electric heater of Fig. 1,
parts being broken away and parts shown in sec
tion so as to illustrate certain details of con
struction; Fig. 3 is an enlarged view mainly in
section illustrating a portion of the terminal
structure used in the heater of Figs. 1 and 2;
Fig. 4 is a bottom plan view of the terminal struc
" ture shown in Fig. 3; Fig. 5 is a bottom plan view
of a part of the terminal structure of Fig. 3; Fig.
6 is a fragmentary plan view of an electric heater
of modified form embodying the terminal struc
ture of this invention; Fig. 7 is an enlarged bot
tom plan view of a portion of the terminal struc
‘o ture used in the heater of Fig. 6; Fig. 8 is a frag
mentary view of still another electric heater us
ing the terminal structure arranged in accord
ance with this invention; and Fig. 9 is an enlarged
fragmentary plan view of the terminal structure
o used in the heater of Fig’. 8, parts being shown
in section to illustrate certain details of con
Referring to the drawing, this invention has
been shown in one form as applied to an electric
50 space or air heater of the type described in my
above-mentioned patent, and comprising a re
sistance conductor I0 mounted in a metallic
sheath or casing II. As shown, the resistance
conductor I0 extends back and forth in a plu
-, rality of parallel lengths between a pair of sup
erence to the sheath by a compacted mass of
material Il, such as magnesium oxide. The
supporting insulators, I2 and I3, as shown, are
provided with series of grooves I5 and I6 re
spectively receiving the resistance conductor and
holding it in its proper position in the sheath 10
I I. The insulator I3 also supports suitable Wire
like terminals I‘I and I8 which are secured to the
extreme ends of the resistance conductor I0.
The terminals I`I and I8 lie Within recesses I9
and 20 provided for them in the insulator I3, as 15
shown in Fig. 1. The terminal members are
connected with the end turns of the resistancev
conductor, as clearly shown in Figs. l, 2 and 3.
For the purpose of making the connections, the
end turns ofkthe conductor are reduced in diam- 20
eter as compared with the turns of the main
portion of the conductor and are swaged or com
pressed on the ends of the terminals, as shown.
At the opposite end of each terminal member
there is provided a looped portion 23 defining an 25
eyelet 24. This looped portion is defined by
forming the end portion of the terminal into a
ring with the extreme end of the wire brought
in against the body of the terminal and extended
for a short distance against the body and parallel 30
with it, as clearly shown in Fig. 4.
The eyelet 2l of each terminal is secured to a
terminal connection member 25. The member
25 is in the form of a nut having a base portion>
26, and a pair of ñanges 21 extending from the 35
base portion on opposite sides thereof and in
substantially parallel relation with each other,
as clearly shown in Fig. 5.
'I'hese iianges as
shown have the form of an arc of a circle the
radius of which is the center of a nut. Between
these flanges and extending through the nut is a
centrally arranged aperture 28 having its axis
coincident with the axis of the ñanges. The
eyelet 24 is mounted on the base of the nut be
tween the two ilanges withthe axis of the eyelet 45
substantially coincident with the axis of the cen
trally arranged aperture 28. 'I'he ñanges are
peaned or bent over the eyelet, as clearly shown
in Figs. 3 and 4, so as to rigidly secure the eyelet,
and hence, the terminal to the connection mem
ber 25. The flanges may be peaned or bent over
in any suitable manner as by means of suitable
dies. The aperture 28 through the nut and the
inner walls of the eyelet 23 are then threaded.
Preferably, the nut will have been threaded be
fore the eyelet is assembled with it, and then after
the eyelet has been assembled in the manner pre
viously described, the assembly will be retapped
so as to provide a finished threaded aperture of
the proper dimensions formed both in the walls
of the nut and the inner walls of the eyelet 2l.
The nut ‘it of each terminal is received in a
recess lll provided for it in the insulator i3, as
clearly shown in Fig. 2. The upper surface of
the nut, as viewed in this figure and also in Fig. 3,
is presented to the under surface oi the upper
wall of the sheath, and between the sheath and
the nut is an insulating sheath
formed oi any
suitable material, such as mica. This insulating
sheet, as shovm, is rectangular in shape, and is
received in a similarly shaped recess lila. pro»
vided for it in the insulator i3.
Extending into the sheath through apertures
provided for them in the sheath are terminal pins
20 3l which, as shown, are threaded and 'which are
received in the threaded apertures provided in
'the nuts 25 and the eyelets 2li-l. Surrounding
each pin 3l in the aperture in the sheath is an
insulating disc
li/lounted upon each pin 3l
25 intermediate its ends is a shoulder
and inter“
posed between this shoulder and the outer surn
face oi the sheath is a sheet or insulating; ma
terial il?l. Preferably, a metallic washer
be inserted between the shoulder and the sheet
dil. it will be understood that the pin received
in threaded relation with the terminal will be in
very good electrical and mechanical contact with
the terminal.
The upper end of the terminal pin il is also
35 threaded, and threaded on this portion is a nut
3b. rl‘he nut
is arranged to secure between it
and the shoulder 33 a suitable electncal connec-1
tion member 3l, shown in Fig. 3 as a circular
wire conductor wrapped around the terminal pin.
In order to insure a good electrical Contact beu
tween the electrical conductor 3l and the termi
nal pin, the adjoining faces» of the shoulder 33
and the nut 3G are dished or tapered inwardly ol
these members and away from each other, as
clearly shown in Fig. 3, to define wedge-like sur»
faces, which when the nut 36 is turned inwardly
tight against the wire 3l cooperate to force the
wire inwardly against the terminal pin. If de
sired, and it is often preferable to do so, thin
metallic washers 38 may be interposed between
the shoulder and nut respectively and the wire
31. The washers initially are flat, but take the
shape of the shoulder and nut when the nut is
turned in.
It will be understood, of course, that any sulta
ble connection member may be secured to the
terminal pin 3l by the nut and shoulder. For ex
ample, a suitable bus bar may be used to connect
a plurality of heaters together. When this is
80 done, it is desirable to stagger> the position of
the two terminal pins 3|, as clearly shown in
Fig, l. In other Words, the two terminal pins
are positioned at different lengths from the ends
of the sheath so that the bus bars may be strung
65 along at right angles to the axis of the sheaths
when used to connect a plurality of heaters to
Where it is desired to connect two resistance
conductors in parallel, the terminal has a some
70 what different form. As shown in Figs. 6 and 7,
two resistance conductors 39 and 40 of substan
tially hair-pin shape are nested one within the
other and are mounted in a metallic sheath 4|.
In this case, let it be assumed that it is desired to
75 connect the two resistance conductors in parallel.
In such an arrangement, the terminal members 42
are formed of a wire member similar to the mem
bers ll’ and I8 of Fig. l, but the eyelet 43 instead of
being formed substantially at one end of the wire
is formed in the center of the wire, and the two
ends of the wire are brought out opposite each
other in spaced relation, as clearly shown in
Fig, 6. @therwise the terminal structure is sub
stantially the same as that previously described.
8 and 9, there is illustrated an electric
heater of the same form shown in Figs. 6 and 7,
except in this case it is desired that a relatively
portion oi the terminal end oi the sheath
be unheated. lin other words, relatively long
‘terminals are used. .ds shown in Fig.' 8, there,
two resistance conductors 474i and 45 arranged
as are the conductors 35 and lill of
6 and con
nected to terminal members t6, which in general
have the same iorm as the terminal members
G and l. 'in order to support the inner
ends of the legs or the terminals 46 in proper
relation with reference to the sheath, suitable
insulating supporting members 4l are provided.
r¿he members dl are formed oi a suitable elec~
trically insulating material, such as porcelain. 25
These members are provided with centrally ar»
ranged apertures »i8 extending therethrough and
in these apertures there are received metallic
bushings ¿it which in tuin are mounted directly
on >the legs oiv the terminal member. As shown, 30
the metallic bushings are secured against end~
wise movement on the legs oi the terminal by
flattening, sir/aging or pressing the extreme right
end portions of the sleeves onto the legs, as
shown in lï‘ig. 9. This swaging or compressing
forms flattened sections 50 in the sleeves and 5l
in the terminal legs which interlock with each
other and thereby prevent movement of the
sleeves on the legs. 'I'he opposite ends oi the
bushings or sleeves 49 are provided with collars
lit. The insulators 41 are prevented from sub
stantial longitudinal movement relative to the
terminals by means of these collars and the flat~
tened sections 50 at the opposite ends of the
It will be understood that the supports 41 will
be mounted on the terminal legs before the
resistance conductors are attached to the termi
nais. This may be accomplished by threading
the insulators on their sleeves 49 and then
threading the sleeves 49 onto the terminal legs,
properly positioning them on the legs, and then
providing the flattened sections 50, 5l in the
sleeves and legs.
While I have shown particular embodiments of
my invention, it will be understood, cf course,
that I do not Wish to be limited thereto since
many modifications may be made, and I, there
fore, contemplate by the appended claims to cover
any such modifications as fall within the true
spirit and scope of my invention.
What I claim as new and desire to secure by
Letters Patent of the United States is:
l. Terminal structure comprising a wire-like
terminal member having a looped section defining
an eyelet, a. connection member having a base
fitted to one side of said eyelet and having parts
directed up anduov'er the sides of. the eyelet to
clamp it to (the base, the eyelet being threaded
and the base having a threaded aperture regis
tering with the threaded eyelet, and a terminal
pin threaded through said base and eyelet.
2. Terminal structure comprising a terminal
having a looped portion defining an eyelet, a nut
connection' member having a base fitted to one
side of said eyelet and portions extending from
the base and folded over the eyelet to clamp the
terminal to the nut, said nut and terminal having
a tapped aperture extending through the eyelet
and nut, the threads of the aperture being formed
in the Walls of the eyelet as well as in the nut,
and a terminal pin threaded in said aperture.
3. A terminal structure comprising a nut con
nection member having a base and spaced par
l0 allel flanges extending from the base, a terminal
member having an eyelet fitted on said base sub
stantially centrally thereof, and a portion ex
tending from the base through the space between
said flanges, the flanges being folded over to
tightly grip said eyelet and interlock it with said 5
nut, said nut and eyelet having a tapped aper
tureZ the threads of which extend into the Walls
of said eyelet, and a terminal pin threaded into
said aperture.
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