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Patented July 22, 1947
2,424,385
UNITED STATES PATENT OFFICE
7 John F. Cook, Rocklord, Ill., assignor to Barber
Colman Company, Rockford, 11]., a corporation
of Illinois
Application June 27, 1945, Seriai‘No. 601,896
3 Claims. (Cl. 172-239)
The invention relates to closure operator con
trol systems such as gnay be used for operating
doors, gates and the like. It ?nds particular,
although not exclusive, utility as applied to en
trance doors for public garages and similar build—
ings.
The general aim is to improve and simplify
prior control systems of this general type such
as, for example, that shown in H. F. Collins Pat
ent No. 2,262,’! 19, issued November 11, 1941. More
particularly, my objective has been to simplify
2
electric drive motor l6 provided with alternative
ly energizable ?eld windings. Ila and Nb, which
are selectively energized to accomplish rotation
of the motor in a corresponding direction.
Through appropriate speed reducing mechanism,
the motor drives one of the sprockets l8 over
which an endless roller chain I9 is trained. In
the present instance, the winding Ila is energized
for closing the door and the winding I‘Ib for
opening.
To connect the chain IS with the door [0, a
carriage 20 is mounted for traversing movement
along a horizontal. trackway 2! located between
while still retaining performance of their func
the upper and lower reaches of the chain [9. A
tions. As‘ will be evident from a comparison with 15 curved arm 22 is pivotally connected at its oppo
the system disclosed in said Collins patent, I have
site ends to the carriage 20 and to a bracket 23
succeeded in eliminating one of the three limit
bolted to the upper portion of the inner face
switches which are there used, together with its
of the door It. The carriage 20 is ?xed to the
actuator, while still retaining the same overall
chain l9 and, accordingly, when the lower reach
functions for the circuit. This not only reduces 20 of the chain is moved to the left (as viewed in
the cost of the parts but also very considerably
Fig. 1) the door I0 is pulled upwardly and to
simpli?es the initial adjustments required in in~
the rear into its open position. Similarly, when
and lessen the cost of such a system through
elimination of a substantial number of parts,
stalling the apparatus.
‘
Further objects and advantages of the inven
tion will become apparent as the following de
\scription proceeds, taken in connection with the
accompanying drawings, in which:
Figure 1 is a side elevation of a door and op
erating ‘mechanism therefor, as well as for a
control mechanism embodying the present in
vention, the associating building structure being
shown in vertical section.
Fig. 2 is a schematic wiring diagram of the
the lower reach of the chain I9 is moved to the
right or in the opposite direction, the door it
is slid downwardly to its closed position. The
configuration of the arm 22 and the location of
its pivots is such that, when in the position of
Fig. 1, it prevents the door ID from being pushed
up, thus locking it closed. The motor brake also
30 aids in holding the door closed.
The control system for the door operator motor ‘
It includes a control station designated gener
ally as 24 (Fig, 2) and which may be located at
apparatus of Fig. 1.
.
any suitable point either near to or comparatively
For purposes of illustration and explanation 35 remote from the door ID, as may be desired
of its novel features, the invention has been
in a particular installation. The control sta
exempli?ed herein as embodied "in an operating
tion 24 in the particular construction here shown
system for a door or closure member in such as
includes a pair of normally open switch contacts
may be used, for example, in a public garage.
21 arranged to be bridged by depression of the
The door itself may, of course, take various forms 40 “opening” push button 25. Similarly, a “closing”
and since door structures of the general style
push button 26 is arranged, when depressed, to
shown are well known, a brief description will
bridge
a pair of normally open switch contacts
suffice as a preliminary to detailing of the ac
28
and
to open a pair of normally closed back
tuating arrangement for it.7
The particular door shown, (Fig. 1) is of the 45 contacts 29. In addition to the manually oper
ated push button switches noted above, there
so-called overhead type. .It is made up of a pin
are included in the illustrated control system
rality of horizontal sections - ll hingedly con
vtwo limit switches 3| and 32 as part of a limit
nected so that the door may be slid upwardly
switch assembly designated generally as 30. It
and inwardly along a curved trackway l2 on
will be observed that a'third limit switch, desig
which it is supported by rollers l3. When in the
closed position shown the door II) is vertical and 50 nated as ‘33 in the Collins Patent No. 2,262,719
closes a doorway It in a wall l5. When moved
referred to above, has been eliminated in its»
upwardly along the trackway i2 the door ?nally
entirety, together with its actuator which is desig
reaches an open position in which it rests upon
the horizontal upper arms of the trackway.
nated as 50 in said patent, but, as will appear
below, the circuits have been reorganized in a
novel manner herein. so that there is no sacri?ce
The power drive mechanism for the door I 0
is illustrated herein as including a reversible
in function.
' masses
The limit switch ‘assembly 34 illustrated herein
--is, of course, but one of a variety or forms that
may be employed, so far as mechanical construc
tion is concerned. As here shown, it is mounted
adjacent chain I9 (see Fig. 1). ‘Both of the
switches 3| and 32 are normally urged to open
position by suitable spring arrangement (not
shown). The switch 3| is arranged to be closed
advertent gravity descent of the door I! is e?ec
vtively prevented at all times.
Attention may now be given to the connections
employed in-the illustrated control system. With
the supply line Lo connected to the common ter
minal of the motor windings Ho and Nb, the
motor is energized for closing and opening move‘
ments by connecting the other terminals of the
corresponding windings Ila and I‘lb to the sup
by an actuator ?nger 34 loosely Journaled on a
horizontal rockshaft 35. Integral with the actu 10 ply line L1. To initiate opening movement of
the door III the opening switch 25, 21 is closed.
ator ?nger 34 is a two-horned cam lug 3! dis
posed in the horizontal path or movement of a
lug or projection 31 ?xed on the chain I9. When
Thereupon a circuit to the motor winding |1b is
completed through such switch in series with the -
normally closed back contacts 29 of the “closing”
the parts are in the position shown in Fig. 2,
movement of the lower reach of the chain I9 to 15 switch and through the limit switch 3| (through
the left will cause the lug 31 to strike the left
hand horn of the cam 35 and swing it in a
counterclockwise direction so that the ?nger 34
E-)-55—21—51—29—-58—3 |—"59—-|‘Ib—-3I|—55
As soon as the opening movement of the door
I0 starts, the second limit switch 32 is closed
latter to open. Such movement of the ?nger 34 20 automatically thereby completing a holding or
maintaining circuit in shunt with the manually
in a counterclockwise direction is limited by an
operated “opening” switch 25, 21. Thus it will
integral stop ?nger 38 which contacts a ?xed
be noted that the switch 32 has one terminal con
plate 39. Furthermore, an over-center spring
nected to the line L1 through the conductor 3|
biased toggle mechanism serves to snap the actu
releases the contacts 3|, thereby permitting the
ator ?nger 34 to one or the other or its ex 25 while the other terminal of switch 32 is connected
to conductor 58, and then to motor winding I‘Ib,
' tremities of movement toward which it is shifted.
This toggle mechanism includes a pin 40 pivoted
to its upper end to the actuator structure and I
having its lower end projecting loosely through
through 55-10-29.
Consequently, the push
button 25 may be released after a momentary
closure and the door Ill will continue to rise
a hole 4| in the plate 39, a helical compression 30 until it reaches the fully opened position. At the
spring 42 being arranged to encircle the pin.
Also mounted on the shaft 35 is an actuator
for the other limit switch 32 and which is sub
stantially similar to that heretofore described
latter point the limit switch 3| is automatically
opened thereby interrupting the previously iden
ti?ed circuit to the motor winding III) to stop
the motor.
'
To close the door III the push button 28 is
for the switch 3|. This actuator includes a 35
depressed thereby opening the back contacts 29
?nger 43 fastened as an integral projection on a
and closing the main contacts 28. The closing
plate carried on the shaft 35. On this plate is
of contacts 28 completes an energizing circuit
formed a two-horned cam 44 as well as a stop
?nger 45 cooperating with the ?xed plate 39.
for the motor winding Ila with the limit switch
The cam 44 is arranged to be engaged by a second 40 32 again functioning in the circuit, this time in
series with the “closing" switch 28. Thus sup
projection 41 carried by the chain I9. As in the
ply line L is connected to the motor winding I‘Ia
case of the ?rst actuator described, a toggle mech
through 6 |-32-65-—28—63. As soon as the door
anism is provided including a pin 48 and spring
starts to descend, the switch 3| is closed.
49.
.
In general, the actuating arrangements for 45 As the door ID descends, if the operator re
leases the push button 25 at any time the con
the limit switches 31 and 32 are such that both
tacts 28 reopen, thereby interrupting the ener
of these switches remain closed throughout sub
gizing circuit to the motor closing winding Ila.
stantially the full path of travel of the door I0
Moreover, the back ‘contacts .29 are reclosed, re
and are opened only at respective extremities of
its path of travel. Thus the switch 3| is open 50 sulting in the establishment of a circuit for the
motor opening winding Ilb, again through so
only when the door is open, while the other
action of the limit switch 32. Thus, when con
switch 32 is open only when the door is closed.
tacts 29 are reciosed there is a circuit from Ll
With but two limit switches, so related as to
to the winding I'Ib through 6 |—32--65——'|0-29—
time of operation, there is no problem involved
58—3|——59. Consequently the descent of the
55
of initially timing a plurality of switches to open
door I0 is not only stopped upon releasing the
and close precisely in unison.
push button 26, but in addition, the motor I5 is
automatically reenergized to restore the door to
its fully opened position. The advantages of
example, as alternating current supply lines
such an action, from the standpoint of safety,
L1 and L2. The system may, for example, be 60 will be clear. Should a car or person attempt
designedfor operation from a conventional 110
to enter the doorway while the door is closing
volt alternating current supply line. ‘
the operator has only to release the button 23.
Current for the electric drive motor I6 may
be supplied from any suitable source such, for
As a further safety measure, a brake 5| (Fig.
The door will go back up to its safe open position
l) is applied to the motor I6, this brake being 65 without even requiring the attendant to have
presence of mind enough to press the button 25.
normally urged into braking condition by suit
In the event that the operator holds the closing
able spring mechanism (not shown). An electric
push button 25 depressed throughout the closing
solenoid 52 (Fig. 2) serves, when energized, to
movement of the door ID, the door ?nally reaches
release the brake 5|. Energization of the sole
noid is controlled by normally open contacts 53 70 the fully closed position shown in Fig. 1. Upon
reaching such position the limit switch 32 is auto
01 a relay 54 having an actuating winding 55
matically opened, thereby interrupting the previ
interposed in the common supply lead of the
ously identi?ed energizing circuit to the motor
motor ?eld windings I'Ia, I'Ib. In this way the
winding I'Ia so that the motor stops and the door
solenoid 52 is energized when, but only when,
the motor I6 is in operation. Accordingly, in, 75 remains closed.
2,424,885
5
circuit preparatory to completion of the same by
From the foregoing it will be perceived that
the limit switch 32 performs three rather distinct
reclosure of said second manual switch to effect
restoration of the closure member to open position
whenever the third switch is manually released
during closing of the closure member.
2; In a power operator for a closure member,
the combination oi.’ a reversible electric motor
functions in the system, and it is by using this
single switch to accomplish such a variety of
purposes that I have achieved an important over
all simpli?cation in the system. First, the switch
32 serves to interrupt the energizing circuit to the
motor winding Ila at completion of the normal
closing movement 01' the door. Second, the
having a pair of terminals adapted to be alter
natively connected to a supply line for e?ecting,
switch 32 functions to establish a holding circuit 10 respectively, opening and closing movements of
in shunt with the opening switch contacts 21 so
that only a momentary closure of the latter is
the closure member, a pair of leads for connect
ing respective ones of said terminals to a supply
so that such circuit may be automatically com
ing" switch also interposed inthe last-mentioned,
lead between said ,“closing” switch and the supply
required to effect full opening of the door. Third, ' line, a normally open manually operable “closing"
switch interposed in the lead to the closing ter
the switch 32 partially completes an energizing
circuit for the opening winding ill; of the motor, 15. minal, a normally open manually operable l‘open
pleted by reclosure of the contacts 29 to?e?ect
line, a ?rst limit switch and an additional man
emergency reopening oi‘the door after partial
closure of the latter.
ually operable switch interposed in series in the
‘ In analyzing the foregoing circuit it will be seen 20 lead to the opening terminal, said additional
switch being mechanically interconnected with
that there is a lead from the motor closing wind
said “closing" switch to open and close in alter
ing Ila to the supply line L1 in which the man
nation therewith, means for retaining said ?rst
ually operated closing and opening switches are
limit switch closed throughout the path of travel
interposed in series (l1a—63—23—65-'I0—5l2‘|—53—L1), whereas there is a second lead from 25 of the closure member and for opening such
switch only when such closure member is substan
theother motor winding i‘lb to the supply line
tially fully open, a second limit switch also inter
L1 in which the switches 3|, 29 and 32 are all
posed in said lead to said opening terminal be
‘interposed in series (ilb—-59-3i—38—29—10—
tween the supply line and said additional switch,
05-—32—8l-L1). Moreover, there is what
amounts to a cross connection between these two 30 means for retaining said second limit switch
closed throughout the path of travel of the closure
leads constituted by the conductor ‘Hi which is
member and for opening such switch only when
common to the two. Such point of cross con
such closure member is substantially fully closed,
nection, is located in the ?rst lead at a point
and a cross connection between said leads from a
intermediate the “opening" switch 21 and the
‘_‘closing" switch 23, and in the other lead at a 35 point in the lead to the closing terminal inter- '
mediate said "opening” switch and said “closing”
switch to a point in the other lead intermediate
said second limit switch and said additional
point intermediate the limit switch 32 and back
contacts 23 of the “closing” switch. By such inf
terconnection I .am able to accomplish the oper
ation described with but two limit switches act
ing in conjunction with the “opening" and "clos
1 ing” switches and back contacts on the latter.
, I claim as my invention:
'
switch.
40
,
3. In a power operator for a closure member
movable between open and closed positions, the
combination of a reversible electric drive motor
having “opening” and “closing" windings, said
1. In ajower operator for a closure member
windings being adapted for common connection
movable’ between open and closed positions, the
to one terminal or a power source, an intermediate
45
combination or a reversible electric drive motor
terminal supplied from the remaining terminal
having two alternatively available energizing cir
of said power source via a parallel circuit includ
cuits tor e?ecting rotation of the motor in cor—
ing (a) a ?rst manually operable normally open
responding opposite directions for respectively
switch means and (b) a normally closed limit
opening and closing the closure member, means
switch arranged to be openv only when the closure
including a ?rst manually operable switch nor 50 member is fully closed, second manually operable
mally biased to, open position for energizing said
switch means connected to said intermediate ter
opening circuit, said means also including a sec
minal and effective normally to connect the same
ond manually operable switch which is normally
to said "opening" winding but depressible to al
closed and a ?rst limit switch. both connected in
ternatively connect said intermediate terminal to
series with said ?rst manual switch, means ior re 65 said "cl0sing” winding. and a normally closed
taining said ?rst limit switch in closed position
limit switch in series with said "opening” winding
throughout the travel or the closure member and
and arranged to be open only when the closure
for opening the same only when such member is
member ‘is fully open, so that said ?rst and sec
substantially in fully open position, a third man
and manually operable switch means are eilec
ually operable switch normally biased to open po
tive respectively to cause opening and closing or
sition and mechanically connected to said second
the closure member ‘and so that the closure mem
manual switch to open and close in alternation
her will be automatically driven to the open posi
therewith, and means including a second limit
tion upon release of said second switch means
switch operable in timed relation with the closure
with the closure in an intermediate position.
member to remain closed throughout the travel 65
\
JOHN F. COOK.
or such member and open only when the latter
is substantially i'ully closed tor (a) deenergizing
REFERENCES CITED
the motor closing circuit upon completion or a
The
following
references are or record in the
closing movement or the closure member insti
.
tuted ‘by closing 0! said third switch. (1)) com 70 ?le 01' thll patent:
pleting a holding circuit in shunt with said
manualswitchtoretainsaidmotoropening cir
cult energiaedaitermomentary closureoisaid
?rst manual switch, and (c) partially computing
an energizing connection for said motor opening
UNITED'STATES PATENTS '
Number
2,263,719
Name
Date
Collins --.....-..-..-.. Nov. 11, 1341
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