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Патент USA US2025575

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Dec. 24, 1935.
I
'
A_ p, DANZ
2,025,575
CONTROL SYSTEM
Filed April 11, 1934.
Inventor" :
Arnold P. Danz ,
His Attorney.
2,025,575
Patented Dec. 24, 1935
U N I TJE'D IS TATEES
PATIENT for-F1 or:
; 2.0255575
CONTROL ‘SYSTEM
.Arnold P. DanzyLarchmont, N. Y., assignor to
v General Electric ‘Company, aucorporatiou of
_ 'New' York
x'Application-Ap?lill, 1934,.’Serial No.'i:'720,067
:80laims. (Cl...214—-116)
This invention relates to control systems, more Twinding;~?dr-um‘i=2!I which linl'turn' is rotated by
vparticularly to-systems'for controlling the opera I-means ofaan electric motor‘ 22' to the drive shaft
wtioni‘of- electric motorsand the 1ike,~and- it has‘ for -"-of"whichi-the: drumIZI is connected by means of
"an object the provision of-a— simple, reliable and » suitable gearing?- 2 3.
improved system of this character.
The ‘ trolley motori'22 ‘may § be of any suitable -
More speci?cally the invention relates to ma
‘terial handling- systems; and ‘a more speci?c’ ob
ject of the invention-is-the-provision of means
*type, 5but I like 1 the Z-hoisting - motor ; I6 = is illus
~ztrated as an t alternating current ‘ squirrel cage
~ for preventing the material‘carrieri‘fromi return
lsuppliedqv'rithpower from asuitablesource, rep
‘ ing @with/ material ~' from‘ the ~ unloading- point ~ to
1' resented
the ‘drawing ‘by the three supply lines 10
124,;‘to'~which the‘ motors 22 and I6 are-respec
- the loading point.
The invention‘ is an‘ improvement" on ‘ the > in
vention disclosed in application i-‘Serial “No.
’588§368—\Freese, ?led 'Jan. 23, 1932pand ‘I'do
I15 ‘not herein claimr-anything disclosedin‘ the said
-Freese-application,which as far as the; present
‘ application is "concerned - is to be regarde'deas
prior art.
In: carrying the invention into effect in‘one
form thereof “ an electric motor‘is provided for
' moving a load tea-predetermined limit-of oper
ationye. g., an unloading point; and meansare
linductionl'motor. "Both ~ motors'? and IIB are
itivelyconnected by means-of- conductors 25 and
"26. iSuitable reversing switch’ means, illustrated
as apairofcontactors? and 28, are included in
-' the connections 26 for controlling the direction of
“rotation or» the “hoist motor‘ I 6.
‘In order to» control< the hoisting and lowering
=-operations=of the‘ bucket Ill-at the loading pit I I,
asuit'able control : means ' 30 are provided. ‘Since
these control‘ means are-extremely complicated 20
' and form no'parts of the present invention, they
-are'iillustrated"conventionally-for the purpose of
provided forremoving' the load and reversing simplifying» the drawing.
the ‘direction of rotation of themotor; together
»
~Similar1y,~control' -means‘ 3| -'_are provided for
25 With‘ means responsive to' the ‘continuance of‘xa -' controlling the trolley'motion of ‘ the bucket I 0
load on the motor after‘ operation of'the load re
moval means for again‘ reversing the ‘direction'of
and“ carriage I3~* between a point above the load;
"ing pit‘and'a point‘above the silo I2. Since these
‘ the motor and causing‘ it "to 1' move the "load
‘ control-means ' are‘ also -quite complicated and
‘likewise-*form-no- part ‘of the present invention,
‘in’ the original direction.
they are illustrated‘conventionally in'the draw
In ‘illustrating the'invention'in. one i'ormthere
‘of, it'is' shown'as embodied‘ in‘. a' “bucket-hoist, “mg.
\ trolley-conveyor‘ system.
“Aswitching devicefillustrated‘as a limit switch
For‘ a'b'etter and-more com'pleteunderstanding
' 3 2' ‘ controls the '- operation vof > a ' control device i1
of the inventiom‘reference should now be‘ha'd' to Ilustr'ated-asrarrelay 33when' ‘the carriage I3 is
35 ‘the following speci?cation"and'to'the'accom
located" above the silo. "This control relay- 33- co
' panying'drawing; the single-"?gure of which’ is"a operateswith= a'loa'd-responsive-device 34 for con
simple‘diagrammatical illustration‘ of an embodi " trolling the energiza'tion/of the hoisting and low
ering- cohtactors~2l and 28 when the‘carriage
ment 'of the invention.
‘is-located above‘the’silo. The-load responsive
' Referring‘ now to" the ‘drawing: asuitalole ma
40. terial carrier illustrated‘as a bucket ‘lll‘serves to ~ device; 34 is illustrated‘ as~a switchwhich isso
transport a; material; su’ch‘for 'examplefas' co'al,
~ constructed-1v and arranged “that as ‘ long - as > the
‘bucketi‘l? is‘loaded-“themovable contact 35 is
is supported from a carriage I3 by means of a ~maintained‘~in' engagements-with its cooperating
' from a'loading pit I I to a silo I2. . The bu‘cket‘lll
" rope or cable I4, one end of which is connected
45 ' to the carriage in the manner illustrated and .the
stationary contact-member "35a and~when the
‘bucket’ I I! ‘is-unloaded ‘themovable contact mem
otherv end of whichis connected to a‘ hoisting
ber"36 '~is"~m‘aintained in'‘ engagement 'with its
drum ‘I 5. “An electric motor 'I 5, .Lthe‘driving'shaft
cooperating stationary contact-member36a. ' This
~is‘due'to the‘ fact :that' When the-bucket I 0 is load
of which is connected to ‘the ‘shaft of the wind
ing drum ‘I 5 by means of gearing‘ "I1; is provided ed' a tension exists in v‘the hoisting cable I 4' which
‘is transmitted‘through the carriage to the trolley
for‘ hoisting and ‘lowering theibu'cketdll. "Al
though the motor .'I 6 may be of any suitable type, ‘cable'?ll. FThus'wh-en theibucket is loaded,- the
it is illustrated as an alternating current squirrel " tension in“ the trolley cable Zilbetween the car
'riage l3 andthepull-ey- 31 is sufficient to maintain
cage induction motor.
'
" For the purpose .of transporting the bucket II] "the movable contacts 35 ‘in engagement- with con
55 from a point immediately above the loading pit I I
tacts'35a' against'the vvtension-~of- spring 38 and
tola point 'above’the “silo l2 aniI-beam track 18 “similarly"when‘the-bucket isi unloaded this ten
; upon which the carriage l3 rides,‘ is provided. '—sion 'decreases , and allows ‘the spring 38 to close
'The motion of the. bucket .I 0. and ‘the carriage‘l3 ' the movable contact member “into-engagement
60
.alongithis -I-beam .track'is controlled‘ by means
of a' trolley cable 20 which is wound upon‘ the
" with; v‘the. ‘stationary contact - member ' ‘36a.
"Suitable means illustrated as a vtimedelay-re- 60
2,025,575
lay 40 are provided which cooperate with switch
ing device 34 for preventing an inertia load from
energization of its operating coil, the time delay
energizing the lowering contactor and causing it
to operate the motor [6 in a‘lowering direction
into engagement with the cooperating station
ary contact to complete an energizing circuit
device 40 moves its movable contact member 40a
for the operating coil of the hoisting contactor 5
21. This energizing circuit is traced from the
positive side of the supply source through the
system, the operation of the system itself will be ' contacts 45, 46 in the closed position thereof, con
readily understood from the following detailed ductor 52, contact 41%. interlocking contacts 28a ’
of the lowering contactor, operating coil of hoist- 1g
‘
10 description.
ing contactor 21 to the negative side of the supply
It is assumed that the bucket ID has been load
ed in the pit I I, hoisted to the carriage I3 and source.
‘ Contactor 2T in responding to the energization
moved along the I-beam track'l8 to aposition
directly above the silo’ I2. The trolley motion of its operating coil closes its contact to connect
the motor IE to the supply source 24 for rotation in 15
15 of the bucket I0 is stopped at this point by the
when the bucket In is unloaded.
'
With the above understanding of the appa
ratus and its organization in the completed
control ‘means 3|" under the control of suitable
As the
bucket I0 is brought to rest at a position above
the silo I2, the contact member 4| bridges the
'limitswitch mechanism (not shown).
20 stationary contact members 32 to complete an
energizing circuit for the operating coil of con
trol relay 33, from the positive side of a supply
source through the contacts 32, conductor 42,
operating coil of the relay 33 to the negative side
25 of the source. The relay 33 in responding to the
energization of its operating; coil bridges upper
and lower stationary contact members 333. and
33b. The bridging of the stationary contact mem
bers 33a completes an energizing circuit for the
30 operating coil of the lowering contactor 28, which
a direction to hoist the bucket I0.
,
Simultaneously with the closing of the upper
‘contact member 40a, of the time delay device, the
lower contact member 40b'is operated into en
gagement with its cooperating stationary contacts 20
to complete a holding circuit for the operating
coil of the time delay device 40. After an in
terval of time, the duration of which is deter
mined by the setting of the time delay device 405,
the movable contact 4% is pulled out of engage- 25
ment with its cooperating stationary contacts ,
thereby opening the holding circuit for the oper
ating coil of the time delay‘ device 40. The pur
pose of completing a holding circuit for the op
erating coil of the time element device is to pre- 30
vent an inertia load, arising from accelerating the
circuit is traced from the positive side of a sup
ply source through the stationary contact 335, empty bucket in the upper direction, from oper
conductor 43, contacts 35 and 35a, conductor 43a, ating the lowering contactor 28 and causing the
interlock 21a of the hoisting contactor, operating motor [6 to lower the bucket l0. For example, in
35 coil of lowering contactor 28 to the negative the absence of this time element device or if equiv- 35
side of the supply source. As a result, the lower . alent means werenot provided, the inertia of the
ing contactor 28 is closed and connects the motor bucket Ill during acceleration in the hoisting di
Hi to the supply source 24 for rotation in a di
rection such that the bucket I0 is lowered in the
40 silo. As the bucket l0 descends, the pin 44 on
the bucket engages the movable member 45 of
a limit switch and knocks it over into engage
ment with its stationary contact member 46,
partially to complete an energizing circuit for the
45 operating coil of the hoisting contactor 21.
After the bucket passes the limit switch 45, it
continuesjto descend into the silo until it strikes
the top of the pile of material already in the silo.
As it comes to rest against the material, the trip
50 pin 41 is operated to unlock the jaws and simul
taneously, the tension in the hoist cable disap
pears since the weight of the bucket and its load
is now resting on the top of the pile of material
within the silo. The disappearance of tension
55 in the hoist cable l4 also causes the tensionin
the trolley cable between the carriage l3 and the
pulley 31 to disappear,.thus allowing the spring
38 to snap the movable contact member 35 out
vof engagement with its stationary contact mem
60 ber 35a and to snap the movable contact member
36 into engagement with its cooperating station
ary contact member 359..
The opening movement of the contact member
35 interrupts the energizing circuit of the low
65 ering contactor 28 causing the latter to open its
contacts and deenergize the hoisting motor l6.
Similarly,'the closing movement of the contact
member 36 completes an energizing circuit for
the operating coil of the time delay relay 40.
70 This energizing circuit is traced from the posi
tive side of a supply source through the contacts
33b (in the closed position thereof), operating
coil of time delay relay device 40, conductor 50,
contacts 36, and 36a, conductor 5i to the negative
75 side of the supply source. In responding to the
rection would place su?icient tension on the trol
ley cable 26 to snap the contact member 36 out of
‘engagement with its’ cooperating stationary con- 40
tact member 369. an-dwould snap the movable
contact member 35 into engagement with its co~
operating stationary contact member 359.. The
opening of contacts 36 and 369. would of course
deenergize the operating coil of the device 40 ‘5
and its contacts would‘ open to deenergize and
open the hoisting contactor 21. However, since
the time delay device 405 provides time delay
action in the opening movement of the contact
4%, the holding circuit for the operating coil 50
of the device 40 is maintained for an interval
of time of su?icient duration to allow any tran
sient inertia load to disappear. Thus, the contact
409. of the device 40 and the hoisting contactor
2‘! are maintained closed during an inertia load 55
even though the force of the inertia load is suf
ficient to overpower the spring 38 and open the
switch contact 36.
.
In the event that the bucket ID has not been
unloaded in the silo but starts back up with a 60
full load, the tension on the trolley 20 will, of
course, open the contact 36 and close the con
tact 35. This load'will persist of course until
after the contact 40b of the time element device
has been opened byv the spring 400. The opening 55
of the contact 405 deenergizes the operating coil
of the device 40, allowing the contact 403. to de
energize and open the hoisting contactor 21.
Contactor 21, in opening, of course deenergizes
and stops the motor I6 thereby stopping the hoist- 70
ing operations and also closes its interlock 21a to
complete an energizing circuit for the operating
coil of the lowering contactor 28. This circuit
is the same as previously traced.
The contactor
28 in closing energizes the motor US for operation 75
2,025,575
in the lowering direction. It will also be observed
that its interlock 28a interrupts the circuit of the
hoisting contactor 21.
The bucket is again lowered until it rests
against the top of the pile of material within the
silo, and the described cycle of operation is re
peated until su?icient material has been emptied
out of the bucket to allow the switch contact 36
to remain closed during the hoisting motion.
Assuming now that the bucket has been dumped
10
and is being hoisted, it rises until the pin 44
engages the movable contact member 45,. snap
ping it out of engagement with the stationary
contact 46, and opening the energizing circuit
15 of the hoisting contactor 21. From this point on
the horizontal trolley motion or the bucket I0 and
the lowering of the bucket into the loading pit is
under the control of controllers 30 and 3| re
spectively. As the carriage is moved to the left,
20 the contacts 32 are opened to deenergize the re
lay 33 which in turn opens to deenergize the
time delay relay 40 and further to interrupt the
energizing circuit for the lowering contactor 28.
Time element relay 40 in opening further inter
25 rups the energizing circuit of the hoisting con
05
70
switching device for causing said motor to hoist
the bucket and responsive to continuance of load
in said'bucket during said raising operation for
stopping said motor and causing said motor to 20
bucket during the raising operation for reversing
said motor to lower the bucket to said limit, and 35
means for preventing the reversal of said motor
What I claim as new and desire ‘to secure by 'by an inertia load.
Letters Patent of the United States, is:
'7. A control system for trolley buckets and the
l. A controlsystem comprising an electric mo
like comprising an electric motor, a cable con
tor for controlling the movement of a load in necting said motor with the bucket, reversing 40
one direction, means for removing said load at switching means for controlling the direction of
a limit of operation, means for reversing the rotation of said motor comprising a hoisting con
operation of said motor at said limit, means re
tactor and a lowering contactor, means for re
sponsive to continued load on said motor after moving the load from said motor at a limit of
operation of said load removing means for stop
the lowering operation, a switching device con- 45
ping said reverse operation of said motor, and trolled by the tension of said cable and responsive
a time element device for rendering said load to the removal of said load for actuating said
responsive means inactive for an interval of time hoisting contactor and. responsive to the con
tinuance of said load on said motor for actuat
after removal of said load.
2. A control system comprising an electric mo
ing said hoisting contactor to deenergize said 50
tor for controlling the movement of a load in motor and actuating said lowering contactor to
one direction, means for removing said load at reverse said motor, and a time element device
a limit of operation, means for reversing the set in operation by said switching device for ren
operation of said motor at said limit, means re
dering said device inactive to stop and reverse
sponsive to continuance of load on said motor said motor for a predetermined interval of time 55
after operation of said load removing means for after initiation of said hoisting operation.
again reversing said motor and causing it to
8. A control system comprising an electric mo
move said load in said ?rst mentioned direction tor for controlling movement of a load in one
and means for preventing the reversal of said direction, reversing switching means for control
motor due to inertia loads.
ling the direction of rotation of said motor, means 60
3. A control system comprising an electric mo
for removing the load from said motor at a limit
tor for controlling the movement of a load in of operation, a switching device connected to be
one direction, means for removing said load at a responsive to the removal of said load for actuat
limit of operation, means for reversing the op
ing said switching means to reverse said motor
and responsive to the continuance of load on said 65
eration of said motor at said limit, means re
sponsive to continuance of load on said motor motor for again actuating said switching means
after operation of said load removing means for to reverse said motor and causing it to move said .
again reversing said motor and causing it to load in said ?rst mentioned direction, and a time
delay device set in operation by the removal of
return said load in said first mentioned direc
tion, and means for preventing the return oper
said load for preventing said second reversal of 70
ation of said motor for a predetermined interval said motor for a predetermined interval of time,
of time after the reversal of said motor at said thereby to prevent reversal of said motor due to
an inertia load.
limit.
ARNOLD P. DANZ.
4. A control system for electrically operated
scope of the annexed claims.
60
motor to lower the bucket to a limit of operation, 15
means for dumping the bucket at said limit, a
themselves to persons skilled in the art without
35 departing from the spirit of the invention or the
65
switching device for preventing stopping of said
motor by said switching device for a predeter
mined interval of time after initiation of said 10
reversal operation.
5. A control system for electrically operated
buckets and the like comprising an electric motor
for operating the bucket, means for causing said
ations and modi?cations will readily suggest
as embodied in concrete form, it will be under
stood that the apparatus and connections shown
in the drawing are merely illustrative and that
the invention is not limited thereto since alter
60
buckets and the like, comprising a motor for low
ering the load to a limit of movement, means for
removing said load at said limit, means for re
versing the operation of said motor, a switching
device responsive to continuance of said load after 5
reversal of said motor for stopping said motor,
and a time element device cooperating with said
reverse and lower the bucket to said limit, and
a time element device actuated by said switching
device and cooperating therewith for preventing
said switching device from stopping and revers
ing said motor for a predetermined interval of 25
time after said initiation of said hoist.
6. A control system for electrically operated
buckets and the like comprising an electric motor
for operating the bucket, means for causing said
motor to lower the bucket to a limit of operation, 30
means for dumping the bucket at said limit, means
for reversing said motor to raise the bucket, means
responsive to continuance of the load in the
tactor 21.
Although in accordance with the provision of
the patent statutes this invention is described
15
3
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