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Патент USA US3092219

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June 4, 1963
R. A. BURGY
3,092,209
SYSTEM FOR CONTROLLING MOVEMENTS OF ELEVATOR DOORS
Filed Sept. '7, 1955
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Patented June 4, 1963
I)
The superstructure 15 supports a three phase induction
3,092,209
SYSTEM FOR CONTROLLING MOVEMENTS
OF ELEVATOR DOORS
Raymond A. Burgy, Maumee, Ohio, assignor to Toledo
Scale Corporation, a corporation of Ohio
Filed Sept. 7, 1955, Ser. No. 532,843
2 Claims. (Cl. 187-52)
motor 13 which is connected through a belt 17 to a large
pulley 16 on the sha?t of which is ?xed a sheave 19. One
bight of a cable 20‘ takes over the sheave 19 while an
other bight thereof takes over an idler sheave 21 and
the lower lay of the cable 20‘ is connected to an arm
22 which projects rigidly upwardly from the door 11.
When the three phase induction motor 18 turns in one
In modern elevator installations power operated mech
direction, e.g. clockwise, the door 11 is moved toward
anisms are employed to open doors automatically when 10 closed position. When the motor 18 turns in the opposite
cars arrive at hoistway entrances and to close doors be
direction the door 11 is moved toward open position.
As illustrated in the wiring diagram of FIG. III the
fore the cars depart. Passengers sometimes attempt to
three phase induction motor 18 is supplied with current
leave or enter cars after the doors have started to close.
‘from three power lines designated L1, L2, and L3. One
To prevent injury to passengers in ‘such circumstances
elevator door closing mechanisms have been equipped 15 terminal 23 of the motor 18 is connected directly and
permanently to line L1. A second terminal 24 is con
with devices which reverse the movement of the doors
nectible through contacts 25 to line L2 or alternatively
and cause them to reopen whenever their leading edges
through contacts 26 to line L3. The third terminal 27
approach or encounter obstructions. Some such devices
of the motor 18 is connectible through contacts 28 to
have electrostatic ?elds which are affected when the door
edges approach persons. Others have yieldable mem 20 line L2 or alternatively through contacts 29‘ to line L3‘.
In order to insure that whenever the second terminal
hers along the leading door edges that act upon mechan
24 is connected through the contacts 25 to line L2 the
ical contacts to close or open circuits. An installation
third terminal 27 will be connected through the contacts
‘may include a projector which directs a ray of light across
29 to line L3, the contacts 25 and 29 are tied together to
the ‘doorway to a photocell which acts to affect circuits
25 make their respective circuits simultaneously and to break
whenever the light ray is eclipsed.
their respective circuits simultaneously. When the ter
When a person attempts to go through a doorway after
minal 24 is connected through the contacts 25 to the line
the door has started to close usually it is preferable to
L2 and the terminal 27 is connected through the con
cause the door to reopen and after remaining open for
tacts 29 to the line L3 the motor 18 will turn in a direc
a brief interval to repeat its closing movement. If how
ever a person lingers in the path of a door the elevator 30 tion to move the door 11 toward closed position. Like
wise in order to insure that whenever the second terminal
may he kept out of service while the door repeatedly
goes through the cycle of reopening, pausing and starting
to close.
24 is connected through the contacts 26 to line L3 the
third terminal 27 will be connected through the contacts
28 to line L2 the contacts 26 and 28 are tied together to
The principal object of this invention is to provide a
control system for ‘door closing mechanism which func 35 make their respective circuits simultaneously and to break
their respective circuits simultaneously. When the ter
tions to reopen a door upon the interposition of an ob
minal 24 is ‘connected through the contacts 26 to line L3
stacle in its path and to halt the door with its leading
and the terminal 27 is connected through the contacts 28
edge in contact with or in juxtaposition to such obstacle
after the door has gone through a reopening, pausing and
to line L2 the motor 18 will turn in a direction to move
starting to close cycle for a predetermined interval.
the door 11 toward open position.
Another object is to provide a system for controlling
When the contacts 25 and 29, 26 and 28 all are open
the closing movements of doors by means of which doors
themotor 18 will stop and the door 11 will stand still
are held open while persons are in or passing through
wherever it is when the motor stops.
The contacts 25 and 29 are shown schematically as
doorways and are reopened upon contact of the leading
tied together by a rod which extends through a door
edges of the doors with persons or objects during a pre
closing relay 31 that is energized by a circuit that or
determined interval and are halted upon contact of the
dinarily is broken at contacts 32. The circuit energiz
leading edges with persons or objects after the expiration
ing the door closing relay 31 ordinarily can be made
of such predetermined interval.
‘by the contacts 32 when a start relay 33 is energized.
Other objects and various features and advantages of
The circuit energizing the start relay 33 ordinarily is
the invention will be apparent upon perusal of the fol
made by contacts 34 when the car operating system is
lowing description as illustrated by the ‘accompanying
conditioned to start the car. The start relay circuit
making contacts 34- are indicated schematically as push
button contacts. The interlock that prevents the car
equipped with a yieldable leading edge, a projector being 55 from starting before the door is closed is not part of
the instant invention and being well known it is not
so located as to direct a ray of light across the doorway
drawings in which:
FIG. I is a schematic elevational view of an elevator
car having door operating mechanism and a sliding door
and a photocell being so located as to receive such ray
illustrated or described herein.
The contacts 26 and 28 which make and break the
circuits that cause the motor ‘18 to turn in a direction
FIG. II is an enlarged fragmentary sectional view
60 to open the door 11 are schematically shown as tied to
taken as indicated by the line II—-II of FIG. I.
gether by a rod which extends to a door opening relay
FIG. III is a wiring ‘diagram of circuits employed in
35 that is energized by a circuit that is made only when
the device of my invention.
of light.
The following description and the accompanying draw
ing are descriptive and illustrative of a preferred embodi
the car is at, or within a few inches of a landing at
which time the circuit is made at contacts such as are
ment of the invention but they are not intended to im 65 schematically indicated at 36. Moreover the circuit
which energizes the door opening relay 35 is always
pose limitations on its scope.
broken at contacts 37 whenever the door closing relay
The elevator car 10 illustrated in FIG. I is shown as
31 is energized. Hence the circuits that cause the ‘motor
having a single side opening door 11 though the inven
18 to turn in a direction to open the door are always
tion is equally applicable to the control of mechanism
for opening and closing multiple doors. The door 11 is 70 broken whenever the circuits are made that cause the
hung from rollers 12 and 13 which roll along a track 14
mounted on a superstructure 15 carried by the car 10.
motor to turn in a direction to close the door.
The circuit that energizes the door opening relay 35
3,092,209
'
4
3
is broken at a door open limit switch 33 whenever the
door is completely open. The circuit that energizes the
door closing relay 31 is broken at a door close limit
switch 39 whenever the door is completely closed.
The circuits so far described are shown in the con
dition that exists with the door standing open at a land
ing.
In order to keep the door standing open for a
brief interval to permit passengers to enter or leave
the car after the door has opened, the circuit that ener
gizes the start relay 33 is broken by energization of a
short interval time relay 40 whose energizing circuit is
broken at contacts 41 when the car stops at a landing.
The short interval time relay 40 holds contacts 42 out
of engagement for a predetermined short interval, e.g.
one second, after the car stops, so that the start relay 15
Hence if the circuit that energizes the safety relay 50
is broken at the contacts 47 by engagement of the sensi
tive edge 48 with a person or object while the timer
56 has pulled in the contacts 59 the start relay 33 will
remain energized and the circuit that energizes the door
closing relay 31 will remain broken and the door will
remain in engagement with the person or object, resum
ing its closing movement when the obstruction is with
drawn.
The hoisting mechanism and the electric circuits con
trolling the hoisting mechanism and controlled by the
movements and positions of the car It) in its hoistway
are not shown. Hoisting mechanism and devices such
as operate contacts 41 to break the circuit that ener
gizes the short interval time relay 40 when the car stops
33 is never energized until that short interval elapses.
at a landing and operate contacts 60 so that when the
When the start relay 33 is energized it separates con
car is standing at a landing a circuit can be made to
tacts 43 and thus deenergizes the door opening relay 35.
energize the start relay 33, e.g. one second after the
Energization of the start relay 33 moves contacts 44
circuit which energizes the short interval time relay 40
into engagement which makes a by-pass hold-in circuit 20 is broken at the contacts 41, are well known and no
that keeps the start relay energized even if the short
feature of any such hoisting mechanism and circuits
interval time relay is reenergized and the original start
which operate contacts 41 and 60 enters into the instant
relay energizing circuit is broken.
invention.
A source of light 45 is arranged to project a ray of
The instant invention is susceptible to variation with
light across the doorway to impinge upon a photocell 25 out departing from the spirit and scope of the subjoined
46 (see FIG. I). The photocell 46 is wired in series
claims.
with contacts 47 of a switch which is opened whenever
Having described the invent-ion, I claim:
a yieldable or sensitive edge 48 is against a person or
1. A system for controlling movements of elevator
other obstruction in the doorway. Also wired in series
doors comprising, in combination, a motor, means, in
with the photocell 46 ‘and sensitive edge contacts 4L7 are 30 cluding a door closing relay, for causing said motor to
contacts of a push button ‘t9.
Eclipse of the beam of
light to the photocell 46, touching the sensitive edge 48,
turn in a door closing direction, means, including a door
opening relay, for causing said motor to turn in a door
or pressing the push button 49 breaks the main circuit
of a normally energized safety relay 5i).
Deenergization of the safety relay 50 breaks, at con
opening direction, a start relay which when energized
acts to condition circuits for simultaneously energizing
tacts 51, the circuit of the door closing relay 31, breaks,
at contacts 52, the by-pass hold-in circuit of the start
ing relay, a safety relay which when energized acts to
said door closing relay and deenergizing said door open
condition circuits for energizing said door closing relay
relay 33, and makes at contacts 53 a circuit which en
ergizes the short interval time relay 4-0. Deenergization
of the safety relay 5% thus causes the door 11 to re
open if it has started to close or keeps it immobile if
and said start relay, said start relay and said safety
relay acting when deenergized to decondition such re
spective circuits, a door adapted to open or close, a door
it has not started to close.
a sensitive edge on said door, a sensitive edge switch
operated thereby, a photocell, means casting a beam of
In day to day operation the circuit of the safety
relay 50 will seldom be broken by touching the sensitive
edge 48 unless the door 11 has partially closed. The
circuit will be broken however time after time, while the
door is wide open, by repeated eclipse of the beam of
light as persons pass through the doorway. ‘Because
of the delaying action of the short interval time relay
4%) the door will not start to close until, e.g. one second
after light is readmitted to the photocell 46.
Since the door 11 will not start to close until after
light is readmitted to the photocell 46 a person who
knowingly or unknowingly lingers in the doorway and
thereby eclipses the light beam might hold up the opera—
tion of the elevator car inde?nitely.
To obviate this
undesirable possibility the circuit that energizes the safety
relay 50 may be shunted around the photocell 46. The
shunt is effected by contacts 55 which are moved into
engagement by a motor operated timer 56 the motor
of which is energized by a circuit that is made at the
contacts 34 whenever the car operating system is con
ditioned to start the car. After a predetermined long
interval, e.g. ?fteen seconds, while the circuit through
the photocell 46 continues to be broken, the circuit
through the contacts 55 is made thus reenergizing the
safety relay 5%. Thereupon the door 11 moves toward
closed position until either the circuit that energizes
the safety relay 55 is broken at the contacts 47 by engage
ment of the sensitive edge 48 with a person or object
or the circuit that energizes the door closing relay 31 is
broken at the limit switch 39.
In either case the door
ceases to move but does not reopen.
The motor operated timer 56 also pulls in contacts
59 which are wired in parallel with the contacts 52.
way, door operating mechanism driven by said motor,
light across said doorway to impinge upon said photo
cell, said sensitive edge switch and said photocell being
wired in series in a circuit for energizing said safety
relay, whereby said safety relay is deenergized either
by interference of an obstruction with said sensitive
edge or by darkening of said photocell by an object in
said doorway, means, including a short interval time
relay, for momentarily delaying reenergization of said
start relay upon reenergization of said safety relay, and
means, including a timer, for establishing circuits for
keeping said start relay energized after a predetermined
period enduring for a plurality of seconds.
2. A system for controlling movements of elevator
doors comprising, in combination, a motor, means, in
cluding a door closing relay, for causing said motor to
turn in a door closing direction, means, including a door
opening relay, for causing said motor to turn in a door
opening direction, a safety relay which when energized
acts to condition circuits for energizing said door clos
mg relay and deenergizing said door opening relay, said
safety relay acting when deenergized to decondition such
circuits, a door adapted to open or close, a doorway,
door operating mechanism driven by said motor, a sen
sitive edge on said door, a sensitive edge switch oper
ated thereby, a photocell, means casting a beam of light
across said doorway to impinge upon said photocell, said
sensitive edge switch and said photocell being wired
1111 series in a circuit for energizing said safety relay,
Wnereby SaId safety relay is deenergized either by inter
ference of an obstruction with said sensitive edge or by
darkening of said photocell by an object in said door
Way, and means, including a timer, for conditioning cir-.
3,092,209
5
ouits for keeping said door opening relay deenergized
and for shunting current around said photocell after a
predetermined period enduring for a plurality of seconds.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,890,809
Forman _____________ __ Dec. 13, 1932
6
1,982,442
2,018,753
Lubkin ______________ __ Nov. 27, 1934
Wechsler ____________ __ Oct. 29, 1935
2,634,828
2,785,772
‘2,806,553
2,900,521
Bruns et al. __________ __ Apr. 14, 1953
Santini _____________ __ Mar. 19, 1957
Eames ______________ __ Sept. 17, 1957
Eames ______________ __ Aug. 18, 1959
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