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Патент USA US2129773

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Sept. 13, 1938.
A. J. KERCHER
2,129,773
ELECTRICAL SWITCH
Filed Sept. ll, 1955
57 .53 55 56 .54
ATTORNEY.
Patented Sept. 13, 1938
2,129,773
UNITED y STATES
PATENT OFFICE
2,129,773
ELECTRICAL SWITCH
Arthur J. Kercher, Berkeley, Calif.
Application September 11, 1935, Serial No. 40,100
3 Claims.
(Cl. ZOO-100)
This invention relates generally to electrical
contacting devices or switches adapted to be op
erated by current ilow, and is intended particu
larly for use in electrical systems where it is de
a sired to limit the applied current load to a value
below that which would be imposed if all of the
portions of the system were simultaneously con
nected to the current supply.
It is an object of the invention to provide an
improved switch of the above character, which
will afford reliable operation and which can'be
readily adjusted in accordance with various re
quirements.
panying drawing.
Referring to the drawing:
Fig. l is a cross-sectional detail »showing a
switch incorporating the present invention.
Fig. 2 is a cross-sectional detail taken along
‘
'
.Fig S is a cross-sectional detail taken along
Y, the line 3_3 of Fig. 1.
1I‘he switch II illustrated in the drawing is
mounted upon a supporting base or panel I0, to
which a suitable cover can be secured.
of an aligned shaft 36.
A bracket 3l serves to
support shaft 36, and is in turn mounted upon
plate 2l. In order to serve as a bias tending to
rotate shaft 3| and armature 32 in one direction,
a relatively light spirally formed spring 38 is
provided. The inner end of this spring connects
to shaft 3l, while the outer end is attached to an
arm 39, which in turn is carried by shaft 36. To 10
aiîord convenient means for adjusting the angu
lar setting of shaft 36, a shaft 4I is rotatably
carried by plate 2l and extends at right angles
Further objects of the invention will appear
from the following description in which the pre
ferred embodiment of the invention has been set
forth in detail in conjunction with the accom
the line 2_2 of Fig. l.
of shaft 3I is carried by journal 33, while the
other end is journaled to the corresponding >end
f
Other parts can be carried by base I0, such
as a terminal strip I3, terminals 2, and devices
such as a magnetic switch controlled by the
relay I I.
The relay switch Il includes a pair of field
coils i4 and I5, formed from spírally wound rib
5 bon-like conductors I6. The convolutions of each
coil are prevented from direct electrical contact
with each other, by suitable insulating material
Il. The terminals I8 and I9 of coil I4 are shown
connected to the terminal connectors 4 and 5.
4 O Likewise terminals 2| and 22 of coil I5 are shown
connected to the terminal connectors I and 2.
While the coils i4 and i5 are self supporting,
suitable means are provided for retaining them
spaced in side-by-side relationship, as illustrated
45 in Fig. 2. Thus end plates 23 and 24 are clamped
on opposite sides of the coil I4, by screws 26.
Likewise end plates 2l and 28 are clamped on
opposite sides of the coil I5. Spacers 29 inter
connect the plates 24 and 2l, and the assembly
50 of the two coils thus formed, is carried upon the
panel i3 by bracket 30.
Extending through the space between the coils
I4 and I5 and at right angles to the common
magnetic axis, there is a shaft 3|, which carries
55 a laminated magnetic armature 32. One end
to the axis of shafts 3I and 36. A portion 42 of
this shaft 4i is threaded to form a worm, which
is retained in engagement with gear teeth 43
formed on shaft 36. The upper end 44 of shaft
#il is slotted or otherwise formed to receive a
suitable adjusting tool, such as the bit of a screw
driver- Upon changing the setting of shaft 4I, it
is evident that the angular setting of shaft 36 is
altered, to vary the tension of spring 38._
One or more electrical contacts are arranged
to be opened and closed, by oscillating movements
of shaft 3l and armature 32. Thus, as shown in 25
Fig. 3, a pair of spring arms 46 extend laterally
from shaft 3l, and serve to carry movable con
tacts 4l and 48. These contacts cooperate with
relatively stationary contacts 49 and 5I. Con
tact 5I is carried by a leaf spring 50, for a rea 30
son which will be presently explained. As illus
trated in Fig. 2, the tension of spring 38 nor
mally tends to rotate armature 32 in a clock
wise direction, to maintain contacts 4l and 49
closed, and contacts 48 and 5I open. This posi 35
tion of armature 32 corresponds to a condition
at which time little if any current is ñowing
through either of the coils I4 and I5. 1t will
be noted that the ends of armature 32 extend
into the coils I4 and I5, and that the armature 40
is at an angle between a position substantially
parallel to the magnetic axis of the coils, and a
position substantially normal to such axis. Suf
iicient energization of either one or both of the
coils I4 and I5, causes a torque to be applied 45
to the armature 32, in a counter-clockwise direc
tion as viewed in Fig. 2, so that when such cur
rent values reach a predetermined maximum, con
tacts 48 and 5I are closed.
While various methods of winding can be 50
utilized for the coils I4 and I5, the arrangement
illustrated in Fig. 3 is desirable. Thus, the end
of the last -convolution I6a of conductor I6, has
been provided with a tab 53. Likewise secured
to the outer convolution Ilia, there is a member 55
2
2,129,773
54 provided with a tab 56. A connecting member
5'I, of insulating material, is provided with a slot
58, through which the tabs 53 and 56 extend.
Upon bending the tabs 53 and 56 as illustrated
in Fig. 3, it is evident that the last convolution
IBa is maintained tight about the main body of
the coil, thus making the coil self-supporting,
with all of the convolutions retained relatively
tight upon each other. The terminal of the coil
which has electrical connection with the outer
convolutions IBa, is attached by soldering or
welding, as indicated at 59.
The switch described above is useful in a
variety of electrical circuits, particularly where
it is desired to control closing of contacts in ac
cordance with current flow to two separate appli
ances, from the same source of current supply.
For example it can be used where an electrical
heating range and an electrical hot water heater,
are connected to operate from a three-line alter
nating current supply. The two coils I4 and I5
can be connected in series with two lines of the
current supply, so that current flow through the
same will vary according to either one or both
25 of two groups of heating elements of the range.
The heating element of the water heater can be
connected to the third line of the current supply,
and to one of the other lines. The contacts of
the relay can be connected to control current
30 flow to the winding of a heavy duty magnetic
switch, with this switch in turn controlling cur
rent flow to the heating element of the electrical
hot water heater. Thus when the range demand
does not exceed a predetermined value, current
flow can occur to the various heating elements
of the electrical range, and also to the heating
element of the electrical hot water heater. In
the event the current flow to the heating ele
ments of the electrical range is increased beyond
40 a predetermined value, the contacts of the relay
switch are closed, whereby the magnetic switch
either greatly decreases the current flow to the
hot water heater, or interrupts such current flow
in entirety. When the current consumption is
45 again decreased to a normal value the contacts
of the relay are automatically opened, whereby
the magnetic switch again re-establishes normal
connections to the electrical hot water heater.
Systems of this character in which a relay can
50 be used to advantage, are employed in various
instances where the power rate is based upon a
peak load, which must not be exceeded.
Under
such conditions a system such as described, mak
ing use of my relay, makes it possible to take full
advantage of the advantageous power rate, with
out however exceeding the maximum demand
requirement.
As has been apparent from the preceding de
scription, the relay which I provide is of rela
tively simple construction, and it can be adjusted
to trip at various values, by changing the setting
of shaft 4I. Such adjustments can be readily
made, while the device is in use, and without
disturbing the other parts of the apparatus.
Even when full load current flows through the
coils I4 and I5, humming noise is at a minimum.
This is because of the spring mounting of contact
5I, which tends to dampen out vibration. It will
be noted that the moving parts of the relay, to~
gether with contacts 41, 48, 59 and 5|, are all
assembled upon plate 25, which mounts the coil
I5. Thus the relay is a complete device with
only one coil, but if two current coils are desired,
the second coil can be readily added in the man
ner described, Without however interfering with
adjustments in the tension applied to spring 38, 15
after fabrication.
I claim:
l. In a system of the character described, a
pair of field coils disposed in spaced side-by-side
relationship about a common axis, a rotatable 20
shaft extending between said coils and substan
tially intersecting the axis of the same, a mag
netic armature mounted upon said shaft and
having portions extending within each of said
coils, contacts adapted to be opened and closed 25
by angular movement of the shaft, a spring serv
ing to urge said shaft to rotate in one direction,
and means including an adjustable member,
accessible through the space between said coils,
for varying the tension of said spring.
30
2. In an electric device of the type desired, a
current coil, a plate secured to said coil and ex
tending over one end of the same, a shaft jour
naled to said plate and extending at right angles
to the axis of the coil, a magnetic armature se 35
cured to said shaft, a contact carried by said
shaft, a contact carried by said plate and adapted
to cooperate with the first named contact, spring
means tending to rotate the shaft in a direction
to open said contacts, and means also carried by 40
said plate for adjusting the tension on said spring,
the axis of said shaft being spaced laterally from
the coil and the adjacent face of the end plate.
3. In an electric device of the type desired, a
current coil, a plate secured to said coil and 45
extending over one end of the same, a shaft
journaled to said plate and extending at right
angles to the axis of the coil, a magnetic arma
ture secured to said shaft, a contact carried by
said shaft, a contact carried by said plate and
adapted to cooperate With the first named con
tact, spring means tending to rotate the shaft in
a direction to open said contacts, means also
carried by said plate for adjusting the tension
on said spring, the axis of said shaft being 55
spaced laterally from the coil and the adjacent
face of the end plate, and means for mounting a
second field coil in spaced parallel relationship
to the first coil to act upon said armature in
conjunction with the first coil.
ARTHUR J. KERCHER.
v
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