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Патент USA US2106211

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Jan. 25, 1,938.
L.-W. GUIN
2,106,211 '
ELECTRICAL ‘APPARATUS ‘
Filed Oct. 1'7, 1935
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INVENTOR.
LESTER W Gu/N
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Jan. 25, 1938.-
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L. w. GUIN
ELECTRICAL APPARATUS
Filed Oct. 17, 1955
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Jan. 25, 1938.
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‘ELECTRICAL APPARATUS
Filed‘ Oct. 11, 1935
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LESTER N'Gul/v
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ATTORNEYS.
Jan. ‘25, 1938.
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2,106,211
ELECTRICAL APPARATUS
Filed Oct. 17, 1955
4 Sheets-Sheet 4
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INVENTOR.
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BY
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‘I
ATTORNEYS .
Patented Jan. 25, 1938
2,106,211 _
UNITED STATES
PATENT OFFICE
2,106,211
I
ELECTRICAL APPARATUS
Lester W; Guin, Mishawaka, Ind., assignor to
South Bend Current Controller Company,
South Bend, Ind., a corporation of Indiana
Application October '17, 1935, Serial no. 45,415
I
5
17 Claim.
(Cl. 176-124)
This invention relates to the control'of elec
tric circuits such as those used for street light-_
ing, for example circuits of sodium vapor or
in some other manner, energizing means closing
constant current transformer or the like.
An important feature. of the invention relates
to combining the two above-described controls,
by utilizing the magnetic device associated with'
the short-circuit path again, in effect discon
necting the portion of the circuit in which the
other electric lamps arranged in series and sup- ‘ break has occurred until the control'is reset, and
plied with a substantially constant current by a preferably also de-energizing the magnetic device.
One feature of the invention relates to the
control of the circuit in sections, by.means of one
or several auxiliary circuits short-circuiting the
various sections and automatically controlled by
the novel apparatus of my invention.
Where the circuit energizes sodium vapor lamps,
or other devices which require much more power
to start than they do to operate after they are
’ once started, I take advantage of the sectiona1iz-'
ing of the circuit to start a part only of the lamps
at once, allowing a time delay before the short
circuit is opened automatically and an additional
section of the circuit is energized. This permits
20 the use of a transformer having a rating ‘only
slightly higher than that required to start the
lamps in one section of the circuit, or one-half
(or less) of the size that would be required to
start all of the lamps at once.
-
In the illustrated embodiment, there is a time
delay switch which allows the current to pass
through the ?rst section of the circuit long enough
to start the lamps therein, whereupon it breaks
the short circuit automatically, and energizes
30 means such as a magnetic device which discon
nects the time~delay switch and allows the cur
rent to ?ow through the next section. As the
time-delay switch I prefer to use bimetallic con
tacts or other means operated thermally by the
b3 01 passage of current through the short-circuit, and
which will automatically reset itself when discon
Another feature‘ of the invention relates to
short-circuiting a portion of the ‘circuit, as for
example one of the above-described sections, auto
matically in case of ‘an accidental break therein.
A very positive yet simple means of doing this is
provided in a control apparatus having a mag
- netic device which is'effective, as long as cur
rent is ?owing in the circuit as ‘usual, to hold
open contacts which close automatically in case
of such a break to energize a novel auxiliary
'
of a break operates the movable contacts or their 10
equivalents to produce the arcing current which
energizes the safety device which short-circuits
the portion of the circuit in which the break has
occurred.
The control apparatus in itself embodies-sub 15
stantial novelty in the structure and arrange
ment of its parts, and in their manner of mount
ing. It is preferably constructed as a compact
unit readily connected into the circuit as de
scribed, with the safety device provided with 20
manually-operable reset means operable from
outside the unit,‘and with the automatically op
erating parts arranged to be readily and ve12
fectively housed and protected.
The above and other objects and features of the 25
invention, including a novelauxiliary apparatus
for automatically de-energizing the primary of
the constant current transformer when the above
described safety device is actuated by a break in
the circuit, and other novel combinations and de 30
sirable arrangements, will be apparent from the
following description of the illustrative embodi
mcnts shown in the accompanying drawings, in
which:
Figures 1, 2, 3, 4, and 5 are diagrams of cir 35
cuits embodying one or both of the short-circuit
ing mechanisms described above;
nected as described above. '
circuit.
the time-delay switch as the means which in case
.
The closing of the auxiliary circuit connects the
magnetic device through a short-circuit path
across the portion in which the break has oc~
curred, whereupon the magnetic device is momen,~
tarily re-energized to open said contacts again,
with a resultant current arcing across them. The
55 arcing current is utilized to close a‘ shunt path, or
,
Figure 6 is a vertical section centrally through~
a controller embodying one desirable form and
arrangement of the control parts of the circuit of 40
Figure 1;
Figure 7 is a horizontal section therethrough
on the line 1-1 of Figure 6, showing most of the
parts in top plan view;
.
'
Figure 8 is a front elevation thereof with ‘the 45
front part of the casingremoved, and looking
in the direction of the arrows 8—8 in Figure 6;
Figure 9 is a partial section on the line 9—9 of
Figure 6; and
I
Figure 10 is an enlarged partial section on the 50
line ill-l0 of Figure 7.
'
In the diagram of Figure 1, my novel com
bined control devices are shown inclosed in the I
dotted line ID. This diagram shows a circuit l2
of sodium vapor lamps or the like l4 connected 56
2
2,106,211
in series, and which is connected at its ends to
the secondary, I6 of a constant current trans
former having a primary I8 arranged to be con
referred to below, ‘until the switch 20 is again
opened. This switch may be manually operated,
nected by means such as a switch 20 to a source
of current such as a power line 22.
mote control, or be otherwise operated in any
or have a time control, or have some form of re
desired manner.
In this circuit, my novel combined control I0
If, however, there is a break, for example at
is intended to control a short-circuit path from a' 30, the ?ow of current through 38 stops, and con
point 24 to a point 26, to sectionalize the circuit .\tacts 34, 44, 40 are again closed. This reestab
in such a manner as to start the lamps I4 in lishes the first condition, with section 28 short
10 groups of few enough lamps to be within the circuited out. When, after the above-described 10
power range of the transformer Iii-I8, and also time delay, the contacts at 48 again separate, an
to disconnect aportion 28 of the circuit in the auxiliary circuit is momentarily established from
event of an accidental break therein, for example 24 through 32, 34, 40, device 38, and 54 to 25.
at 30.
This immediately breaks the circuit again at the
15 The point 24 is shown connected by a line 32 contacts 34, 44, 40 by lifting the part 36.
with a contact 34 which, with two other contacts
described below, is engageable with an armature
36 or other circuit-closing means actuated by a
solenoid or magnet 38. A second contact 40,
forming one of the group of three controlled by
the magnetic device 38, is connected by a lead 42
to the portion ‘28 of the circuit, so that when
the device 38 is de-energized and the contacts
34 and 40 are connected there is a dead circuit
25 from 24 through 34 and 40 and 42 and through
There is a second solenoid or magnet or equiv
alent magnetically operated device .60 connected
across from lead 32 to the part 36. Just as the
device 38 is of higher resistance than the time
delay switch 48, and consequently is ine?ective 20
unlessvthat switch is open, so the device 60 is
shorted out by the lower part of lead 32 and con
tact 34 and is normally ineffective.
However, when the part 36 is momentarily
raised as described above, in case of a break at 25
the section 28 of the circuit, in which no cur- " 3Il,_the current arcs across at 40, because of the
rent flows.
.
The third of these contacts, indicated at 44, is
connected by a lead 46 to a pair of bimetallic
30 members 48 and 49 having contacts which are'
closed when they are at the same temperature.
The bimetallic member 48 is active, in that it is
heated by a heating resistance‘ 50. The other
bimetallic member 49 is used to compensate for
35 changes in surrounding air temperature and is
shielded from the heating effects of the heater
resistance 50. The contacts of the bimetallic
members 48 and 43 separate, when the active
member is sufilciently heated, to open the circuit
through the contact 44. The current passes from
the contact of member 48 through the heating
resistance 50 and through leads 52 and 54 to
point 26. When current passes through the re
sistance 50 for a predetermined time interval,
45 the heat is su?lcient to open the contacts of mem
bers 48 and 49 and break the circuit there
through. This device-therefore forms a simple
and effective time-delay switch which automati
voltage concentration at this point, and this are
ing current finds the path through the magnetic
device 60 to be of less resistance than that between
the separating contacts at 34, and consequently
30'
the device 60 is energized. This lifts an arma~
ture or the like 62 to bridge and close contacts ‘54.
Once the contacts 64 are thus closed, they remain
so until part 62 is reset manually.
The closing of contacts 64 short circuits'de
vice 38 through leads 66 and 68 and through the
lower- part of leads 54 and 42. This allows the
contacts 34, 40 to close and remain closed, thus
short circuiting section28 out of the circuit until
thebreak at 30 is repaired and the device ‘80 is 40
manually reset to open the contacts 54. With
the contacts closed at 34 and 40, the current
passes from 24 through 32, 34, 40, lower part of
42,‘ 66, 64, 62, 64, 68, upper part of 54, to 28.
The circuit of Figure 2 is like that of Figure l
with the safety device involving the parts 60-48 ,
omitted. It operates as described above to start
part of the lamps first and then the remainder,
cally resets itself when the active member cools > but does not cut off a portion of the circuit in
off again.
~»
case of a break therein. 'Its-operationwill be
The magnetic device 38 is connected between
leads 54 and 32, when contacts 34 and 40 are
closed, and between leads 54 and 42 when con
tacts 34 and 40 are open. _It is therefore at all
55 times in series either in the circuit I2 or 28, and
is effective to lift the part 36 to break the con
tacts 34,14, and 40 whenever substantial cur
rent is ?owing in the portions I2 or 28 of the
circuit.
-
,
It is, however, in e?ect short-circuit'ed out of
the circuit as long as current flows from 24
through 32, 34, 44, 4G, 48, 50, 52, and 54 to 25
clear from the ?rst part of the description of
Figure 1.
-
Figure 3 shows an arrangement utilizing the
safety device alone, omitting the time-delay.
switch and its associated auxiliary circuit.
It
operates lILcase of a break to short-circuit all of
the circuit -II2, cutting it off from the secondary
I6 of the transformer. Preferably it also opens
the, switch 20 automatically, in the case of such
a break, to disconnect the primary I8 from the 60
source of current 22.
_
In this case the current normally ?ows from
(i'. e. normally, as long as the contacts at 48 secondary I 6 through the entire circuit “2-, in
. remain closed) .
Therefore, when the switch 2IIv which the magnetic device I38 is connected in
is ?rst closed to start the system in operation, series. This holds the part I36 in its upper po
the section 28 is short-circuited out of operation sition, disconnecting the contacts "land
for the time interval required to cause separation from each other. In case of a. break, the con
of the contacts carried by the member 48. , This tacts I34 and I40 are connected by the de-ener
interval is su?icient to start the lamps I4 in the gization ofthe'device I38. This closes a circuit
70 ?rst section of the circuit.
from secondary I6 through lead I32, contacts 70
Upon the opening of these contacts at '48, cur
I34 and I40, device‘ I38, lead I54, and back to
rent ?ows through the device 38, energizing the secondary I6. The device I33 is thereby momen
device 38 and breaking the contacts at 34, 44, 40. 'tarily energized, lifting the part I 36_, and causing
This allows current to ?ow through circuit sec
a current to are across from contact I48.
tion 28, unless there is some accidental break as
This arcing current passes through the second 75
.75
3
2,100,211
magnetic device I60, closing the contacts I84,
and establishing a momentary circuit from I8 by
way of lead I32 through device I60 and part I36,
coils secured vertically between the brackets 302
and 304 adjacent opposite sides of the panel 300.
As best appears in Figure, 9, the armature 36,
through contact I40 and lead I66 by way of con
with its contacts for engaging contacts 34, 44,
tacts I64 and lead I68 back to the secondary. and 40, is secured to a block 3I4 of insulating ma 5
This short-circuits the circuit containing the terial, which in turn is carried by a U-shaped
lamps or other devices I4, and also short-circuits movable core‘ 3I6 cooperating, in the manner
the magnetic device I38. Thereafter, until the usual in alternating current relays, with a ?xed
part I62 is reset manually, the path is I6, I32, ‘*‘U-shaped core 3I8 in ‘the upper part of the calls
10
I34, I36, I40, I66, I64 I62, I64, I66, I54, I6.
Preferably . the‘
switch
20
is
38.
automatically
Both cores are shown as of laminated con
struction. When'current passes through the coils
38, it tends to reduce the gap ‘between cores 3I6
opened at the same time. In the arrangement
shown, device I60 also operates an armature ‘I0
to break the connection between two contacts ‘I2
and 3I8, thereby drawing the core 3I6 upwardly.
15 in a control circuit ‘I4 in which is arranged a
solenoid or magnet or other magnetic device 16
coil secured between the‘ brackets 302 and 304
in front of .the device 38,v and provided with a
_ Thev device 60 is shown as including a single
This circuit
composite plunger comprisingian insulating part
may also include a manually or automatically
320 serving as a handle for resetting the device,
and which is rigidly connected by a rod 322 of
arranged to operate the switch 20.
operated switch ‘I8 which (when contacts 72 are
20 connected, as is normally the case) can be used
to stop and start the system.
-
The arrangement in Figure 4 is the same as in
Figure 3, except that the control circuit I'I4 has
normally open contacts I42, and is auxiliar-y to a
main control circuit 8.0 which is short circuited
by'switch ‘I8, which is opened to cause the device
‘I6 to actuate switch 20.
'
In this case the auxiliary circuit I14 is ‘in'par
~allel with the device ‘I6,’ and short-circuits it
is
brass or other non-magnetic material with a 20
movable iron core 324, which in turn carries an
insulating part 326 on the upper end of which
the contact 62, in the form of. a copper sleeve or
ring, is mounted, and which is formed with a
locking groove 328 just below the contact 62.
The contacts 64 are shown as spring ?ngers
which normally interlock with the groove 328,
holding the whole core or plunger assembly in its
upperv position.
The rod 322 passes vslidably
30 when the contacts I12 are closed. This arrange~ , through a ?xed, core 330, shown ‘as secured in
ment is useful when the control circuit 80 is a
series circuit similar to H2.
The circuit shown in Figure'5, includes a main
30.
a tube 332 of insulating materialwhich serves
as a guide for the movable, core 324, and on
which the coil 60 is wound. The coil 60 may have
lamp circuit 2I2, or an equivalent circuit of some “a suitable cover, as shown, if desired.
On passage of current in the coil 60, as pre
other character, having associated therewith an
auxiliary or loop circuit 228 which is normally to viously'described, the core 324 is drawn down
be energized but which it is desired to disconnect ward, and the contact 62 bridges and closes’ the
contacts 64 until the device is reset manually by.
automatically in case ,of a break, as at 230.
Normally with switch 20 closed, current path . pushing upward on the part 320.
40 may be traced from I6 through the right-hand
part of 2 I2, through magnetic device 238, through
loop 228, and through the left~hand part of H2,
back to I6. In this condition the contacts at 234
and 240 are broken by the device ,238, which is
45 at that time energized.
In case of a break at 230, the device 238 is
deenergized, closing the contacts at 234 and 240
and momentarily causing the current to flow
from I 6, through the right-hand part of the cir- ,
50. cult 2I2, through device 238, across contacts 240
and 234, and through the left-hand part of cir
cuit 2I2, back to I6." This immediately lifts the
part 236, breaking the contacts at 234 and 240.
As the second magnetic device 260 is connected
55 in parallel with the contact 234, there is an arc
at the separating contact 240, where all the pres
F
The bracket 302 has‘mounted thereon, just in 40
front of the device 60, a block 336 of insulating
material, on which are secured two short blocks
338 of brass or the like, between which is gripped
one end of the compensating bimetallic strip 48.
A screw 340 threaded into the lower block 338 45
serves to connect the lead 46 to the strip 49,
and also serves, with an auxiliary screw 342, to
clamp the'blocks 338 together with strip 49 be
tween them.
~
'
Immediately above the upper block 338 is a
piece 344 of asbestos board, or other heat insu
lator protecting the strip 49 from the heat of the
resistance wire 50 which is just above the board
344. The resistance 50 is connected at one‘end
directly" to the lead 52 (which comes up from a‘ 55
connection below the bracket 304 through a pro
sure is e?ective, and this ‘arcing current passes >
tecting tube 346) ,’ and at its other end is soldered
from I6, H2, 238, 240, 236, 260, 2I2, back to I6.
or otherwise secured to a brass block 348 held
This Hits the part 262 to close the contacts by but insulated from the screws 340 and 342.
' The strip 48 is shown 'as provided at its, free 60
60 264,'leaving them closed until part 262 is manu
ally reset, thereby deenergizing the device 238 end with an adjustable setscrew 350 passing
again. The current path is now I6, 2I2, 268, through a hole in the board 344, and serving as a
264, 262, 264, 240, 236, 234, 2I2, back to I6.
Figures 6 to 10 illustrate a novel compact and»
65 effective controller for use in the circuit of Fig
ure 1, and including the parts of the circuit with
in the dotted line I0 in Figure 1. These parts are
all shown carried by a suitable panel 300 of in
sulating material, having a pair of supporting
70 brackets 302 and 304 of similar material. This
panel is secured to the back of a housing made
in two parts 306 and 308 secured together by
means such as bolts 3I0 which may be inclosed
in tubes 3I2 of insulating material.
*
In this embodiment, the device 38 includes two
contact adjustably engaging the strip 48. Thus
the whole circuit between 62 and 46 includes
resistance 50, block348, strip 48, setscrew 360, 65
strip 49, blocks 338, screw 340, ‘to lead 48,.
It will be seen that the controller is easily '
assembled, the parts are readily accessiblekand
the whole, is very compact and e?ectively housed.
While several circuits, and one particular con
,troller, have been described in detail, it is not my
intention-to limit the scope of the invention by
.that description, or otherwise than by the terms
of the appended claims. '
I claim:
'
'
76
4
2,106,211
1. A lighting system comprising a source of
substantially constant current, a set of vapor
lamps connected in series in a circuit forming
a loop connected at its ends to said source, means
CR for short-circuiting a portion of said loop to
permit the starting of the remainder of the lamps
independently of the short-circuited portion,
means for automatically breaking the short-cir
cuit formed by the ?rst means after a time in
10 terval, and means for automatically reestablish
ing said short circuit if a break occurs in said
portion of the loop.
2. A lighting system comprising a set of vapor
lamps connected in series in a circuit forming a
15 loop, means for short-circuiting a portion of said
loop to permit the starting of the remainder of
the lamps, means for automatically breaking the
short-circuit formed by the ?rst means after a
time interval, and means for automatically rees
20 tablishing said short circuit if a break occurs in
said portion of the loop.
3. A lighting system comprising a set of vapor
lamps connected in series in a circuit, means for
maticaily short-circuiting the circuit across said
part thereof.
7. An electric circuit for operating devices such
as lamps or the like comprising a source 0! sub
stantially constant current, a set of said devices
connected in series in a circuit connected at its
ends to said source, and means for short-circuit
ing a portion of said circuit in case 01’ a break
therein and which includes a magnetic device
connected into the circuit and having contacts
held open by the passage 01' current there
through, an auxiliary circuit through said device
which is closed by the closingof said contacts in
case of a break, and a second magnetic device
having contacts closed by current passed there
through due to arcing at the ?rst contacts as
they reopen when the auxiliary circuit is closed,
the closing of the second contacts de-energizing
the ?rst magnetic device and short-circuiting
said portion of the circuit.
20
8. An electric apparatus for automatically
short-circuiting a portion of a circuit in case 0!
a break therein and which includes a magnetic
short-circuiting a portion of said circuit and in- ‘ device connected into the circuit and having con
25 cluding contacts which can be opened to break
the short-circuit, means for automatically open
ing said contacts after a predetermined time de
lay, and auxiliary means actuated by the open
case of a break, and a second magnetic device
ing of said contacts for holding the short-circuit
having contacts closed by current passed there
through said circuit.
4. A lighting system comprising a set of vapor
lamps connected in series in a circuit, means for
reopen when the auxiliary circuit is closed, the
closing of the second contacts de-energizing the
?rst magnetic device and short-circuiting said
30 broken thereafter as long as current passes
short-circuiting a portion of said circuit and in
35 cluding contacts which can be opened to break
the short-circuit, bi-metallic heat operated ele
ments carrying said contacts, a heating device
through due to arcing at the ?rst contacts as they 30
portion‘of the circuit.
I
9. Anelectric circuit for operating devices such
as lamps or the like comprising a source of cur
rent, a substantially constant current trans
adjacent said elements and operated by said
former, a switch for connecting the primary oi’
means when the contacts are closed and auto
the transformer to said‘source, a set of said de
vices connected in series in a circuit connected 40
at its ends to the secondary of the transformer,
means for short-circuiting a portion oi said cir
cuit in case of a break therein and which includes
a magnetic device connected into the circuit and
having contacts held open by the passage of cur
matically opening said contacts after a prede
termined time interval, and auxiliary means actu
ated by the opening of said contacts for discon
necting said device from said means and for
holding the short-circuit broken thereafter as
45 long as current passes through said circuit.
5. A device for short-circuiting part of the, cir
cuit of a vapor lamp lighting system or the like
so
tacts held open by the passage of current there 25
through, an auxiliary circuit through said device
which is closed by the closing of said contacts in
and then breaking the short-circuit after a time
interval comprising three contacts two 01' which
are adapted to be connected in said circuit at the
points to be short-circuited, a magnetically-oper
ated device for connecting and disconnecting said
contacts and which is connected in said circuit
adjacent said two contacts, and a. time-delay
55 switch connected to the third contact and to the
circuit in such a manner as to be in parallel with
said device.
I
6. A device for short-circuiting part of the cir
' cult of a vapor lamp lighting system or the like _
and then breaking the short-circuit after a time
interval and for short-circuiting a part of said
circuit in case of a break therein, comprising
three contacts two of which are adapted to be
I" connected in said circuit at the points to be short
65
circuited, a magnetically-operated ‘device for con
necting and disconnecting said contacts and
rent there-through, an auxiliary circuit through
said device which is closed by~the closing of said
contacts in case of a break, a second magnetic
device having contacts closed by current passed
there-through due to arcing at the ?rst contacts
as they reopen when the auxiliary circuit is
closed, the closing of the second contacts de
energizing the ?rst magnetic device and short
circuiting said portion of the circuit, and means
rendered operative by the actuation of the second 65
magnetic device for‘ opening saidswitch to dis
connect the transformer primary from, said
source.
~
10. An electric circuit for operating devices such .
as lamps or the like comprising a source of cur
rent, a substantially constant current trans
former, a switch for connecting the primary of
the transformer to said source, a set of said de
vices connected in series in a circuit connected
at its ends to the secondary of the transformer,
means for automatically short-circuiting a por
whichis connected in said circuit adjacent said tion of said circuit in case of a break therein, a
two contacts, a time-delay switch connected to magnetic device having contacts actuated by cur
rent passed there-through due to the operation
70 the third contact and to the circuit in such a of‘ said short-circuiting means, and means ren
manner as to be in parallel with said device, and dered operative by the actuation of said magnetic 70
a safety‘devicealso in parallel with the mag
device for opening said switch to disconnect the
netically-operated device and operated in case of transformer primary from said source.
a break in said part of the circuit by current pass
11. An electric circuit comprising means ren- '
w ing in an are at one of said contacts and auto ‘dered operative by a break ina portion of the 75
2,106,211
r
-
’
‘
.
5
'
to permit the starting ofethe remainder of the
circuit for short-circuiting said portion of the
lamps, means for automatically including the
circuit, said means including a device having con
tacts automatically engaged and then separated > excluded portion after a time interval, and means
to produce a current arcing there-between when ,for automatically re-establishing said exclusion
the break occurs, and an auxiliary circuit ener
if a break occurs in said portion of the loop.
gized byrsaid current arcing across the separated
contacts and automatically closing a short-circuit
such as lamps or the like comprising'a source
across said portion of the circuit.
16. An electric circuit for operating devices
of current, a substantially constant current
transformer, a switch for connecting the primary
of the transformer to said source, a set of said 10
,
12. An electric circuit comprising means ren
10 dered operative by a break in a portion of the
circuit for short-circuiting said ‘portion of the
devices connected in series in a circuit connected
at its ends to the secondary of the transformer,
means for excluding a portion of said circuit in
circuit, said means including a device having con
tacts automatically engaged and then separated
to produce a current arcing there-between when
case of a break therein and which includes a
‘magnetic device connected into the circuit and 15
having contacts held open by the passage of cur
rent therethrough, an auxiliary circuit through
said device which is closed by the closing of said
contacts in case of a break, a second magnetic
15 the break occurs, a normally-open auxiliary cir
cult in parallel with said portion of the ?rst cir
cuit, and means energized by said current so arc
ing between the separating contacts and which
‘ is e?ective to close said auxiliary circuit.
13. ‘A lighting system comprising a set of vapor device having contacts closed by current passed
lamps or the like, connected in series, a source therethrough due to arcing at the ?rst contacts
of substantially constant current, means for con ‘as they reopen when the, auxiliary circuit isv
necting a portion of said circuit in series with closed, the closing of the second contacts de
energizing the ?rst magnetic device and exclud
said source, and means for automatically con
20
'25 necting another portion of the circuit in series
' ing said portion of the circuit, and means ren
between said source and said ?rst portion after
_
a predetermined time delay.
'
14. A lighting system comprising av source of .
substantially constant current, a set of vapor
30 lamps connected in. series in a circuit forming
acloop connected at its ends to said source, means
for excluding a portion of said loop to permit
starting of the remainder of the lamps independ
ently of the excluded portion, means for auto
85 matically including the excluded portion after a
time interval, and means for automatically re
establishing said exclusion if a break occurs in
said portion of the loop.
15. Alighting system comprising a set of vapor
40 lamps connected in series in a circuit forming
a loop, means for excluding a portion of said loop
25
dered operative by the actuation of the second
magnetic device for opening said switch to/dis
connect the transformer primary from 'said
source.
I
‘
30
dered operative by a break in a portion of the
circuit for excluding said portion of the circuit,
said means including a device having contacts
automatically engaged and then separated to pro
duce a. current arcing there-between when the 35
break occurs, a normally-open auxiliary circuit
17. An electric circuit comprising means ren
in parallel with said portion of. the ?rst circuit,
and means energized by said current so arcing '
between the separating contacts and which is
effective to close said auxiliary circuit.
LESTER W. GUINZ,
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