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Патент USA US2135046

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NOV- 1, 1933-
J. H. BLANKENBUEHLE'R
2,135,046
CONTROL FOR WELDING GENERATORS
Filed May 4, 1934
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WITNESSES &
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INVENTOR
Nov. 1, 1938.
J. H. BLANKENBUEHLER
2,135,046
CONTROL FOR WELDING GENERATORS
Filed May 4.. 1954
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INVENTOR
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'
TTORY
Patented Nov. 1, 1938
I
\
UNITED STATES "PATENT OFFICE
2,135,046
CONTROL FOR WELDING GENERATORS _
John H. Blankenbuehler, Edgewood, Pa” asslgnor
to Westinghouse Electric & Manufacturing
Y I Company, East Pittsburgh, Pa., a corporation of
.
Pennsylvania
’
Application May 4, 1934, ‘Serial No. 723,879‘
13 Claims. (01. 171-118)
My invention relates, generally, to electrical ator arc welding sets which shall be simple,
control systems and it has particular relation to efiicient and reliable in operation, and which may
control systems for motor-generator arc welding be readily and economically manufactured and
sets.
5
.
-
installed.
Heretofore in the use of motor-generator arc
»
The principal object of myinvention is to pro- 5
welding sets it has been the usual practice tov A vide for disconnecting from a power source a
startup the motor-generator when it is desired
motor-generator set connected to supply current
to perform welding operation and run the motorgenerator continuously for long periods of time
to a load, such, for example, as a welding circuit
a predetermined interval of time after the weld
lO regardless of whether or not welding current was
being used.
,
I have found that it is desirable to disconnect
ing circuit is opened.
.10
Another; important object of my invention is to
provide for connecting to a‘ Power Source a
the motor-generator arc welding set from the
power source in the event that the welding oper-
motor-generator set connected to supply current
to a welding circuit on completion of the welding
15 ation is discontinued for an appreciable time
circuit.
interval in orderto reduce ‘power consumption
and further to prevent unnecessary wear on the
motor-generator set.
-
"
'
,
l5
A further object of my invention is to provide
for automatically resetting time delay apparatus
- whose function is initiated to shut down a motor
It is also desirable to immediately start up the
20 motor-generator set by connecting the driving
motor to the power source when ‘the welding
operation is to be resumed. It is further desirable to maintain the driving motor connected to
the power source for an interval of time after the
25 welding circuit is once opened by means of time
delay apparatus of some sort and to restore ‘the
time delay apparatus to its normal condition in~
the event that the welding circuit is again closed
before it functions to disconnect the driving
30 motor.
generator welding set on opening of the welding
circuit, if the welding operation is resumed within 20
the predetermined time interval.
-
' Other objects of my invention will in part be
Obvious and in Part appeal‘ hereillafter~
My' invention accordingly is disclosed in the
embodiment hereof shown in the accompanying 25
drawings and comprises the features of construc
tion, combination of elements and arrangements
of parts, which will be exemplified in the con
struction hereinafter set forth and the scope-oi‘
the application of which will be indicated in the 30
The foregoing control functions for shutting
appended claims-
down and starting up the motor-generator are
welding set should be entirely automatic and also
under the control of the operator.
~
'
For a. more complete‘ understanding of the
nature and scope of my invention, reference may
It is desirable ' be had to the following detailed description taken
that this control be eifected solely through the
in connection with the accompanying drawings, 35
operator either opening or closing the main weld-
in which
ing circuit thereby making it unnecessary to provide any auxiliary control equipment for the
operator, together with necessary conductors for
Figure 1 illustrates diagrammatically 1,1 Control
system organized in accordance with my inven
tion, and
40 connecting it from the point where welding operations are being performed to the motor generator set itself.
As is often the case, the welding operationis
being performed at some distance from the weld45 ing set audit wouldbe very inconvenient for the
operator himself to go to the set in order to shut
it down or to start it up. In the construction of
a building the operator may be working several
'
-
_
Fig. 2 represents diagrammatically a modi?ca- 40
tiOn of the control ‘system illustrated in Fig. -1
According to my invention, I provide a motor
which is arranged to drive a contact device
through a train of gears. - The operation of the
motor is initiated in response to the opening of 45'
the welding circuit and, if the welding circuit is
maintained open for a su?iciently long interval of
time, the motor will e?ect, by the operation of
floors above or below the location of the motor- ' the contact members, the opening of the main
50 generator set and, rather than take the trouble to- 4 switch which connects .the motor of the motor- 50,
- shut it down, the operatorwill permit the set to generator set to the power source. In the event
run even though the welding operation may be that the welding circuit is re-established within 7
discontinued fora relatively long period of time.
The object ‘of'my invention, generally stated,
55 is to provide a controlsystemfor motor-gener-
the predetermined interval of, time, the motor
will automatically reset so that the interval of
time may again be required to be completed 55
2,185,046
2
After the motor-generator set has been discon
trated. A smaller gear wheel 45 is arranged to
be driven with the gear wheel 4| and it engages
a large gear wheel 45 which is similarly mounted
nected from the power source, it is only necessary
on a shaft 51 and has secured thereto a small
before the motor-generator set will be discon
nected from the power source.
for the operator to complete the welding circuit
by touching the welding electrode to the work-and
a circuit will be completed for reconnecting ‘the
motor of the motor-generator set to the power
source. The welding circuit will then be ener
10 gized and the welding operation may be performed
in the usual manner.
Referring now particularly to Fig. l of the
drawings, the reference character |0 designates,
generally, a three-phase squirrel-cage induction
15 motor which is arranged to drive a direct current
welding generator shown generally at H. The
generator I | comprises an armature l2 and a dif
ferential series ?eld winding I3 which are con
nected to a welding circuit comprising conductors
l4 and |5. As illustrated, the conductors l4 and
I5 are connected respectively to a welding elec
trode l8 and work l1 between which a welding
arc i8 is maintained for performing the welding
operation.
The motor H1 is also arranged to drive an ex
citer generator, shown generally at l8, which sup
plies current to excite a main field winding 20
of the welding generator H. An adjustable re
sistor 2| is provided in series circuit relation with
the main ?eld winding 2|] in order to regulate the
current ?ow therethrough for the purpose of reg
ulating the output of the generator ||.
The motor I0 may be energized from any suit
able three-phase current source which may be
represented by the conductors 22, 23 and 24. It
will be understood, however, that any other suit
able type of motor l0 may be provided for driv
ing the welding generator II and that the motor
generator set comprising the motor Hi, the gen
erator H and the exciter generator I! has been
shown merely for illustrative purposes.
In order to connect the motor “I to the con
ductors 22, 23 and 24, a main switch, shown gen
erally at 30, is provided having an operating wind
ing 3|. The main switch 30 is provided with con
tact members 30a, 30b and 350, which are arranged to connect the motor Hi to the conductors
22, 23 and 24, respectively, as illustrated. A re
sistor 32 is connected in series circuit relation with
the operating winding 3| for a purpose which
will be set forth hereinafter.
In order to deenergize the operating winding
3|, a predetermined interval of time after the
welding circuit is opened to disconnect the motor
I0 from the power source, a time-delay device,
shown generally at 35, is provided. The time—
delay device 35 comprises a motor shown gen
erally at 36 having a ?eld structure 31 and a ?eld
winding 38. A rotor 39 is rotatably mounted be
tween the poles of the ?eld structure 31 and is
arranged, when in the deenergized condition, to
be positioned slightly out of alignment with the
?eld structure 31, as illustrated. The motor 35
may be of any suitable type but it is preferably
of ‘the synchronous type in order to provide for
a de?nite time of operation.
.
When the field. winding 38 of the motor 35 is
energized, the rotor 39 is not only caused to re
volve but it is also caused to move upwardly to
occupy a position of minimum reluctance, as will
be readily understood. The rotor 33 is provided
with a pinion 40 which is disposed to engage a
gear wheel 4| that is rotatably mounted on a shaft
42 secured between brackets 43 and 44 which may
be mounted on the ?eld structure 31, as illus
gear wheel 48 which engages still another large
gear wheel 49 that is mounted on a shaft 55.
A contact arm 53 is carried by the shaft 55 and
is arranged to rotate therewith. A spring 54 se
cured to the contact arm 53 and to the bracket
43 is arranged to bias the contact arm 53 to the 10
position illustrated. The contact arm 53 carries
at the end thereof contact bridging members 55
and 56 which are arranged to bridge contact
members 51 and 55, respectively.
Due to the reduction gearing interposed be 15
tween the pinion l0 and the gear wheel 43, the
contact arm 53 will be moved relatively slowly as
compared to the speed of rotation of the rotor
39 and, therefore, contact members 53 will be
closed only after the expiration of a relatively
long time interval after the ?eld winding 33 of
the motor 35 is energized.
After contact members 58 are bridged by the
bridging member 56, the rotor 35 will stall. How
ever, the construction of the motor 35 is such that
it will not be injured under this condition of oper
ation due to the fact that the ?eld winding 33
offers a relatively high impedance to the flow oi’
alternating current whether or not the rotor 33
revolves.
_
,
In order to initiate the operation of the motor
35, a relay, shown generally at 52, is provided
having an operating winding 53 and normally
closed contact members 52a. The operating wind
ing 53 of the relay 52 is connected in series circuit
relation with a secondary winding 54 of a trans
former, shown generally at 55, the primary wind
ing 55 of which is connected in series circuit rela
tion with the welding circuit. When the welding
circuit is open, as is the case when the weldin!
electrode I5 is out of arcing engagement with the
work | 1, the impedance of the secondary wind
ing 54 is relatively high so that only a very low
voltage is applied to the operating winding 53
of the relay 52. However, as soon as the welding
circuit is completed, the impedance of the sec
ondary winding 5| is reduced to a very small value
and a relatively high voltage is applied to the
operating winding 53 with the result that contact
members 52a are opened. The motor 35 is there
upon deenergized to e?ect the connection 0! the
motor II to the power source.
In the event that it is desired to manually
control the operation of the main switch 35, a
stop push button switch 15 is provided for open
ing the circuit to operating winding 3| while a
start push button switch 1| is provided for con
necting the operating winding 3| to the power
source over circuits which will be traced herein
after.
In operation, it will be assumed that the con
ductors 22, 23 and 24 are energized, that the
main switch 35 is closed and that the welding
operation is being performed. The operating
winding 53 of the relay 52 will then be energized
due to the low impedance oifered by the second
ary winding 54, its contact members 520 will be
opened and the winding 35 of the motor 35 will
be deenergized. Contact members 51 will be
bridged by the bridging contact member 55 and 70
the operating winding 3| of the main switch 33
will be energized.
~
The circuit for energizing the operating wind
ing 3| may be traced from the energized con
ductor 24 through conductors 15 and 15, contact 16
2,135,046
members 19a of the stop switch 18, conductor 11,
operating winding 3|, resistor 32, conductors 18
and'19, contact members 51, conductors 80, 8|
and 82 to the energized conductor 23.
It will be observed that the contact members
51 are wshunted by contact members 30d on the
main switch 38 so that the operating winding 3|
will be maintained energized even though con
tactmembers 51 are opened. Start push button’
10 switch 1| is also arranged to shunt the contact
members 51 in order to permit the operating
winding 3| to be manually energized in the event
that such operation is desired.
‘
.
3
switch 30 will be operated to connect the motor
In to the power source.
'
Referring now particularly to Fig. 2 of the
drawings, it will be observed that a control sys-v
tem generally similar to that described herein
before is shown. However, certain changes have
been made in the circuits. The resistor 32 has
been omitted and the contact members operated
by the time delay device 35 have been modi?ed.
As illustrated, the shaft 50 carrying the gear 10
wheel 49 is provided with an arm 98 which may
be, biased by means of the spring 54 in a manner
similar to the contact arm 53 described'herein
before. The arm 981's arranged to engage a
When the welding circuit is opened, the im
ll pedance of the secondary, winding 84 is increased
member 9| which is pivotally 15
to such a value that the voltage applied to the bridging contact
on an extension of the bracket 44. A
operating winding 83 of the relay 52 is insui?cient -mounted
spring 92 is varranged to bias the contact mem
to maintain it in the operated position and, there
ber
9| into engagement with contact members 93
fore, contact members 62a are closed. The field tobridge
them. When the arm 90 engages the
winding 38 of the motor 36 is then energized and bridging
member 9|, the latter is moved out of 20'
the rotor‘ 39 is moved upwardly to cause the engagement
with the contact members 93 and
pinion “to engage the gear whecl 4| and at the circuit completed
thereby is opened.
the same time it is caused to rotate to move the
contact arm 53.
,In describing the operation of the control sys
,
tem shown in Fig. 2 of the drawings, it will be
assumed that the conductors '22, 23 and 24 are 25
energized, that the main switch 30 is closed and
_ The circuit for energizing the winding 38 may
be traced from the energized conductor 24
through conductor 15, winding 38, conductor 83,
operating winding-3| is energized, and that the
welding operation is being performed. Operat
ing winding 63 of relay 82 will, therefore, be
contact members 82a and conductors 84 and 82
to the energized conductor 23.
“
In the event that the welding circuit is main- ~
energized and the ?eld winding 38 of the motor 30
36 will be. deenergized. Contact members 93
tained open for a su?iciently long time, the con
tact members 58 will be bridged by the bridging
contact member 56 and the operating winding
3| of the main switch 30 will be shunted. Due
to the fact that the resistor 32 is connected in
will, therefore, be bridged.
may be traced from the energized conductor 24
through conductors 95 and 96, contact members 3.5.
10a of the stop push button switch 10, operating
Winding 3| of_ the main switch 30, conductor 91,
series circuit relation with the operating winding
3| a short circuit is not applied to the system as
will
be readily understood.
The ' circuit
for
~ contact members 93
shunting the operating winding 3| may be traced
40 from one terminal thereof through conductor 85,
'
In the event that itis desired to manually shut
down the set, the push button switch 18 may be
In the event that the welding circuit is com
pleted before the contact members 58 are bridged,
‘5 the contact members 62a ofrelay 62 will be
opened and the winding 38 of the relay will be
deenergized. The rotor 39 will move downwardly
causing the pinion“ to move out of engagement
with the gear wheel 4| and, under the in?uence
of the spring 54, the contact arm 53 will be quick ‘
ly moved to its initial position. It will thus be
main switch 38 will be maintained energized
and conductors 98 and 99 to
the energized conductor 23.
contact members 58, and conductor 86 to the
other terminal of the operating winding 3|.
observed that the-operating winding 3| of the
'
A circuit ‘for energizing operating winding 3|
I I
depressed thereby opening'the energizing cir
cuit to the operating winding 3| of the main
switch so, as will be readily understood. If the
set is shut downand it is desired to manually 45.
start it, the start button ‘1| may be depressed
to ‘complete an obvious energizing circuit for the
operating winding 3|.
In the event that the welding circuit is opened, ,
the impedance of the secondary winding 64 will
be increased/ and the operating winding 63 of 50
the'relay 82 will be deenergized to such an extent
that contact members 62a will be bridged. The
while the welding operation is being performed voperating
winding 38 of the motor 38 will then be
“\and for a predetermined time interval after the ‘ energized and the arm 90 will be moved to engage
55
‘welding circuit is opened. However, if ‘the weld
the bridging member 9|. If the welding opera
ing circuit is again completed before the ex
tion is again initiated before the arm 90 engages
piration of the interval of time, the operation of 4 the bridging member 9|, the operating winding
the main switch will be unaffected.
63 of the relay 62 will be energized to open the
Q After the motor III has been disconnected from contact mem rs 82a'and deenergize the ?eld
the power source, ity is only necessary for the winding 38. Pinion 40 will then be moved out of 80
operator to complete the welding circuit in or
engagement with the gear wheel 4| and the arm
der to reconnect the motor III to the power cir-‘
cuit. 0n completing the welding circuit, the. 90 may be restored to its initial position by means
impedance of the secondary winding 64 will be
of spring 54.
I
erati-ng winding63 to be energized and opening
The circuit for energizing the winding 38 may 65
be traced from the energized conductor 24
contact members 82a. The winding 38 of the
motor 33 will be deenergized, pinion 40 will move
contact members 82a, and conductors IM and
99 to the energized conductor, 23.
reduced to a low value thereby permitting the op
through'conductor 95, winding 38, conductor I80,
70 out of engagement with the gear wheel 4| and v
As longv as the welding circuit is maintained
the spring 54 will retrieve the contact arm 53 to open, ‘the operating winding 53 of the relay 82 70
close contact members 51. 3As soon as contact
members 51 are bridged the energizing circuit
vwill be deenergized to such an extent that con
tact members 82a will be bridged. Therefore,
for the operating winding 3|, which has previous
the ?eld winding 38 of the motor 38 will be ener-f
ly been traced, will be completed. and the main gized and the'bridging member 9| will be main
2,185,046
tained out of engagement with the contact mem
bers 93. However, as soon as the welding circuit
is completed, the operating winding 63 of the
relay 62 will be energized to open contact mem
bers 62a thereby e?ecting the deenergization of
the ?eld winding 38 and permitting the pinion
40 to drop out of engagement with the gear wheel
4!. The spring 54 will then move the arm 90 out
of engagement with the bridging member SI
10 and the energizing circuit for the operating wind
ing 3| of the main switch 30 will be completed,
as traced hereinbefore.
In the modi?cation illustrated in Fig. 2, it will
be observed that the operating winding 3| is
15 energized almost immediately after the welding
circuit is completed due to the fact that it is only
necessary for the arm 90 to move a short distance
to permit the contact members 93 to be bridged.
In the modi?cation illustrated in Fig. 1 of the
20 drawings, it is necessary for the contact arm 53
to be reset to the initial position before the en
ergizing circuit for the operating winding 3! of
the main switch 3|! is completed. While this
period will be relatively short due to the fact
25 that the spring 54 need rotate only the reduction
gearing mechanism, it is considerably longer than
the period required for effecting the energization
of the operating winding 3| when the modi?ca
main switch, a relay provided with an operating
coil energized from the power source and nor
mally closed contact members for connecting said
control motor to the power source, and a trans
former connected in the load circuit and in cir—
cuit with said relay operating coil to control the
operation of said relay, said relay disposed to
maintain said switch means open while the load
circuit is closed.
3. Control apparatus for automatically dis 10
connecting from a power source a motor having
driving connection with a generator for supply
ing current to a load circuit comprising, in com
bination, a main switch for connecting the motor
to the power source, an operating winding for
the main switch, means for opening and closing
said load circuit, a control motor, contact means
operable by said control motor a‘ predetermined
interval of time after energization thereof for
effecting the deenergization of said operating 20
winding and thereby opening said main switch,
a relay provided with normally closed contact
members for connecting said control motor to
the power source, an operating winding for said
relay disposed when fully energized to open said .25
normally closed contact members, and variable
impedance means connected in series circuit re
lation with said' last named operating winding
and to the load circuit, said impedance means
disposed to provide a high impedance when the 30
tion of the invention illustrated in Fig. 2 of the
drawings is employed.
Since certain further changes may be made in load circuit is open and a low impedance when
the load circuit is closed thereby causing said
the above construction and different embodi
normally
closed contact members to be opened
ments of the invention may be made without de
when
the
load circuit is closed and closed when
parting from the scope thereof, it is intended
the load circuit is opened.
'
‘as
that all matter contained in the above descrip
4. Control apparatus for automatically dis
tion or shown in the accompanying drawings
connecting from a power source a motor having
shall be interpreted as illustrative and not in a
driving connection with a generator for supply
limiting sense.
I claim as my invention:
_
1. Control apparatus for automatically discon
necting from a power source a motor having
driving connection with a generator for supply
ing current to a load circuit comprising, in com
bination, means for opening and closing said
load circuit, a main switch for connecting the
motor to the power source, means operable from
the power source for effecting the closure of ‘said
main switch immediately upon closure of the load
circuit, time delay means operable a predeter
mined interval of time after energization there
of for e?ecting the opening of said main switch,
a relay provided with an operating coil and nor
mally closed contact members for connecting
said time delay means to the power'source, and
variable impedance means connected to the load
circuit for controlling the energization of the
operating coil, said relay being controlled by the
variable impedance means to maintain said con
tact members open while the load circuit ‘is
closed and to e?ect a closure of said contact
members in response to the opening of the load
circuit.
2. Control apparatus for automatically dis
connecting from a power source a motor having
driving connection with a generator for supply
ing current to a load circuit comprising, in com
bination, means for opening and closing said
load circuit, a main switch for connecting the.
motor to the power source immediately upon
closure of said load circuit, an operating winding
70
for the main switch, a control motor, switch
means operable by said control motor a prede
termined interval of time after energization
thereof for e?fecting the deenergization of said
operating winding and thereby opening said
ing current to a load circuit comprising, in com
bination, a main switch for'connecting the motor .40
to the power source, an operating winding for
the main switch, means for opening and closing
said load circuit, a control motor, contact means
operable by said control motor a predetermined
interval of time, after energization thereof for .45
effecting the deenergization of said operating
winding and thereby opening said main switch,
a relay provided with normally closed contact
members for connecting said control motor to
the power source, an operating winding for said
relay disposed when fully energized to open said "50
normally closed contact members, and a trans
former having a primary winding connected in
series circuit relation with the load circuit and a
secondary winding connected in series circuit re
lation with said last-named operating winding
thereby causing said normally closed contact
members to be opened when the load circuit is
closed and closed when the load circuit is opened.
5. Control apparatus for automatically dis {co
connecting from a power source a motor having
driving connection with a generator for supply
ing current to a load circuit comprising, in com
bination, means for opening and closing said
load circuit, a main switch for connecting the 65
motor to the power source immediately upon
closure of the said load circuit, an operating
winding for the main switch, a resistor connected
in series circuit relation with said operating
winding, 8. control motor, contact means con l 730
nected in parallel circuit relation with said op
erating winding and disposed to be closed by said '
control motor a predetermined interval of time
after energization thereof for shunting said op
erating winding‘ and thereby opening said main "7Y5
'5.
~ 2,185,046
switch, and a relay provided with normally closed
contact members for connecting said control
motor to the power source, said relay disposed to
maintain said contact members open while the
load circuit is closed.
6. Control apparatus for automatically dis
connecting from a powersource a motor having
driving connection with a generator for supply
ing current to a load circuit comprising, in com
bination, means for opening and closing said load
circuit, a main switch for connecting the’ motor
to the power source immediately upon closure of
said load circuit, an operating winding for the
main switch, a control motor, normally closed
15 contact means connected'in parallel circuit re
lation with said operating winding and disposed
to be closed by said control motor a predeter
mined interval of time‘after energization thereof
for shunting saidoperating winding and thereby
20 opening said main switch,_ a relay provided with
an operating coil and normally closed contact
members for connecting said control motor to
the power source, and variable impedance means
connected to the load circuit for controlling the
energization of the operating coil being con
- trolled by said vvariable impedance means, said
relay to maintain said contact members open
while the load circuit is closed and to effect
closure thereof in response to the opening of
30 the load circuit.
'
7. Control apparatus for automatically con
necting and disconnecting to and from a power
source a motor having driving connection with
a generator for supplying current to a load cir
35 cuit comprising, in combination, means for open
ing and closing said load circuit, a main switch
for connecting the motor to the power source
immediately upon closure of the load circuit, re
lay means connected to be responsive to the
40 closure of the load circuit for effecting the closure
of said main switch, and time delay means for
eifectlng the opening of said main switch at the
expiration of a predetermined interval of time
after the load circuit is opened.
45
_
to complete an energizing circuit for said operat
ing winding,_and a relay provided with normally
closed contact members for connecting said con
trol motor to the power source, said relay being
disposed to maintain said contact members open
while the load circuit is closed.
10. Control apparatus for automatically con
necting and disconnecting to and from a power
source a motor having driving connection with
a generator for supplying current to a load cir
cuit comprising, in combination, a main switch
for connecting the motor to the power source, an
operating winding for the main switch,'means
for opening and closing said load circuit, a con
trol motor, contact means operable by said con
trol motor a predetermined interval of time after 15
energization thereof for effecting the deenergiza-p
tion of said operating winding and thereby open
ing said main switch, said contact means being
disposed when said control motor is deenergized
to complete an energizing circuit for said operat 20
ing winding, a relay provided with normally
closed contact members for connecting said con
trol motor to the power source, an operating
winding for said relay disposed when fully ener
gized to open said normally closed contact mem 25
bers, and variable impedance means connected
in series circuit relation with said last named
operating Winding and to the load circuit, said
impedance means being disposed to provide a
high impedance when the load circuit is opened 80
and a low impedance when the load circuit is
closed thereby causing said normally closed con
tact members to be opened when the load circuit
is closed and closed when the load circuit is
35
opened.
.
11. Control apparatus for automatically con
necting and disconnecting to and from a power
source a motor having driving connection with
a generator for supplying current to a load cir
cuit comprising, in combination, a main switch
for connecting‘ the motor to the powersource, an
operating winding for the main switch, a control
8. Control apparatus for automatically con
necting and disconnecting to and from a power
motor, contact ?means operable by said control
cuit comprising, in combination, means for open
disposed when said control motor is deenergized
to complete an energizing circuit for said operat
motor a predetermined interval .of time after en
ergization thereof for effecting the deenergiza
source a motor having driving connection with . tion of said operating winding and thereby open
a generator for supplying current to aload cir
ing said main switch, said contact means being.
50 ing and closing saidiload circuit, a main switch
for connecting the motor to the power source
ing winding, a relay provided with normally 50
closed contact members for connecting said con
trol motor to the power source, an operating
immediately upon closure of the load circuit,
relay means operable in response to the closure
of the load circuit for effecting the closure of
winding for said relay, and a transformer having
a primary winding connected in series circuit re
lation with the load circuit and a secondary wind 55
ing connected in series circuit relation with said
55 said main switch, ,a' control motor disposed to
be connected for energization to the power source '\
on opening of the load: circuit, and contact means.
‘operable by said control motor a predetermined last named, operating winding.
interval of time after, energization thereof for
12. Control apparatus for automatically con
60 effecting the opening of ‘said main switch. ,
necting and disconnecting to and from a power
9. Control apparatus ‘for automatically con
source a motor having driving connection with a
necting and disconnecting to and from a power generator for supplying current to a load circuit
source a motor havingfdriving connection with comprising, in combination, means for opening 1
/
ya generator for supplying current to a load cir
and closing said load circuit, a main switch for'
cuit comprising, in combination, means fol-‘open rconnecting the motor to the powensource im
ing and closing said load circuit, a main-switch mediately upon closure of the load circuit, an
for connecting the motor to the power source
immediately upon closure of the load circuit, an
operating winding for the main switch, a control
motor, switch means operable by said control
motor a predetermined interval of, time after
energization thereof for e?ecting the deenergiza
tion of said operating winding and thereby open
ing said main switch, said switch means being
disposed when said control motor is deenergized
10
operating winding for the main switch, a resistor
connected in series circuit relation with said
operating winding, normally closed contact
means connected in series circuit relation with
said operating winding and normally open con 70
tact means connectedin parallel circuit relation
with‘ said operating winding, 2. control,~,motor for
operating said contact means to open said nor
mally closed contact means _on energization
76
6
2,185,046
thereof and to close said normally open contact
means a predetermined interval of time after
energization thereof, and a relay provided with
normally closed contact members for connecting
said control motor to the power source, said
relay being disposed to maintain said contact
members open while the load circuit is closed.
13. Control apparatus for automatically connecting and disconnecting to and from a power
source a motor having driving connection with
a generator for supplying current to a load cir
cuit comprising, in combination, a main switch
for connecting the motor to the power source, an
operating winding for the main switch, means for
opening and closing said load circuit, normally
closed contact means connected in series cir
cuit relation with said operating winding for
completing an energizing circuit therefor to
effect the closure of said main switch immediate
ly upon closure of said load circuit, a control
motor for opening said contact means a prede
termined interval of time after energlzation
thereof for deenergizing said operating wind-'
ing and opening said main switch, and a relay
provided with normally closed contact members 10
for connecting said control motor to the power
source, said relay being disposed to maintain
said contact members open while the load circuit
is closed.
,
JOHN H. BIANKENBUEHLER.
15
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