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Патент USA US3047106

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July 31, 1962
_1. E. MAGr-:E
3,047,096
CONTROL FOR AN ELEVATOR OLOsURE
Filed Dec. 22, 195e
«./ÚHNEDWÄÑD #714655 INVENTOR
BY
ßg/¿M
AT1-omar
United States' Patent O ”
CC
l
2
performing the door movement operations with a mini
3 047 696
mum of abrupt changes in the forces that are applied to
CONTRÜL FOR AÑ E’LEVATOR CLGSURE
the operating equipment.
John Edward Magee, Ardsley, NSY., assignm- to Otis Ele
vator Company, New York, NX., a corporation of
New llersey
control mechanism.
Another object of the invention is to safeguard trans
ferring passengers while minimizing unnecessary door
`
This invention relates to >door control mechanism, es
movements.
pecially for horizontally sliding elevator doors equipped
with protective mechanism used extensively in installa
tions operating without attendants.
Y
operating efficiency by providing improved elevator door
.
((21.187-48)
,
It is an object `of the invention to improve elevator
Filed Dec. 22, 1958, Ser. No. 782,145
4 Claims.
3,047,096
Patented July 31, 1962
,
It is common practice in present day elevator installa
tions to effect the closing of the elevator car and hoistway
doors automatically. In such installations, safety devices,
or protective mechanisms, have been provided that are
responsive to the presence `of a person in the closing path
of the doors to stop their closing movement, thereby min
`
It is still another Iobject of the invention to provide a
control for elevator doors 'which
passenger
transfer time.
A further object of the invention is to provide a door
control which permits the closing of the doors at hi-gh
speed while minimizing wear and tear of the door oper
ating equipment Iand safeguarding transferring passengers. ‘ I
The invention will be described Iby reference to one
preferred embodiment in which a `car door and a hoistway
imizing the possibilityïof injuring Ethe person. Also, it is
door of the power operated, side opening type and door
usual in such installations not only to stop the doors in 20 protective mechanisms of the light beam and mechanical
closing yupon detection of a person in their path, but to
safety shoe types similar to those shown and described in
reopen them either lfully »or partially to allow the-person to
the aforementioned Bruns patent are utilized. Such a
enter or leave the carunimpeded. Prior safety devices
light beam device detects the presence `of a person in the
utilized yto accomplish this include the light beam type
elevator entranceway any distance `from the leading edge
which is responsive to the presence of a person in the>
of the car door While the mechanical safety shoe, form
closing path of the door yand any distance from the leading
ing the leading edge of »the car door, is yactuated as the
edge of the door, and the -mechanical safety shoe type,
vleading edge contacts a person in its path.
carried by the door »and forming its leading edge to be
ln this preferred embodiment the doors are opened
actuated by a person coming into contact with it. Such
incident to the car stopping at a floor landing, and at ythe
safety `devices are described and disclosed in Ithe patent 30 expiration of a predetermined time interval termed the
to Bruns No. 2,634,828, issued April 14, 1953.
“door open dwell” period, which is preset‘to allow nor
Many installations are equipped with both these safety
mal passenger transfer to take place, the doors are moved
devices. In such `arrangements the light beam device de
toward their fully closed position. Incident to the clos
tects the presence of a person in the entranceway and
ing of the doors, the light beam protective device be
the mechanical `safety shoe device detects the contacting 35 comes effective to detect a person in their closing path.
of a person with the leading edge of the door, both safety
If the closing path of the doors is not obstructed by a
devices operating independently of each other to control
passenger arriving late, Ithe doors continue at normal
the door movements. Since the light beam device detects
closing speed to their fully closed position. Should the
a person in the door’s closing path regardless of the dis
light beam be interrupted by a late transferring passen
tance from the leading edge of the door, ya door is often 40 ger, the closing speed of the doors is reduced below nor
prevented from moving toward its closed position al
though the transferring passenger may have ample room
to enter or leave the car.
To overcome this defect, some
mal closing speed and the doors continue moving toward
their fully closed position at Áthis reduced speed. Oncey
the closing speed is reduced by such an initial detection
prior art arrangements disable the light- beam device if
of a transferring passenger, it is so maintained so long
the beam remains interrupted continuously for a prede 45 as the doors continue moving toward their fully closed
termined time. Such an yarrangement is disclosed in the
position, thereby allowing passengers to clear the en
patent to Santini No. 2,785,771, lwherein if the light beam
tranceway. As the doors thus move toward their closed
is interrupted for less than four seconds the closing door
position at the reduced speed, should the leading edge
is stopped and reopened, but if the light beam remains
of the car door meet an obstruction in its path the me
continuously interrupted for more than four seconds, the 50 chanical safety shoe is actuated, causing the door operat
light beam device is disabled and lthe door is closed; re
ing mechanism to stop the closing movement of the
liance being placed on the mechanical Asafety shoe to
doors. As the obstruction to the closing movement of
prevent injury to transferring passengers. Frequently, if
the doors is removed and the mechanical safety shoe is
intending passengers `arrive at spaced intervals (intervals
released, the doors resume moving in the closing direc
of less than four seconds in the Santini system), this stop
tion at normal closing speed provided that the light beam
ping and reopening iof the `door to allow passenger trans
is also unobstructed. However, if the light beam re
fer occurs repeatedly and requires -the elevator to stand
mains broken by a person inthe closing path or is again
at 'a landing fora considerable time.
obstructed, the closing speed is again reduced below
With such prior art arrangements, the apparatus that
the normal closing speed and is so maintained until Ithe
effects the movements of the door is required to start, 60 doors reach their fully closed position unless the doors
accelerate, stop and reverse the door movement many
are again stopped by actuation of the mechanical safety
times each day as quickly las practicable. Wear and tear
shoe. In this manner both 'the light beam and mechani
on the mechanism inevitably Kaccompanies such usage.
cal safety shoe devices cooperate to effect a persistent
Also, as a general proposition, the degree of this wear
closing effort of the doors after the normal passenger
and ltear is somewhat proportional to the speed with which 65 transfer time has expired to expedite late passenger trans
these operations are accomplished. Therefore, the desire
fer While safeguarding transferring passengers, thus ex
to handle elevator door movements in the least practicable
pediting elevator service and minimizing door movements.
time imposes a heavy burden 'on the mechanism that ef
An additional advantage of the cooperation of the
fectuates their movements. Without unduly restricting
safety devices in controlling door movements is that the
passenger transfer, thisA desire can ‘be realized and the 70 light beam device detects lan obstructing passenger in the
wear and tear on -the equipment can Ibest be minimized,
closing path of the door and reduces the speed of the>
all else being equal, by limiting the door movements and
door in approaching that obstructing passenger before it
3,047,096
3
4
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AMT, such as the RCA 6Sl7 high gain, sharp “cut of ”
encounters the passenger. Therefore the door may be
pentode, having its control grid connected to point X
for amplifying the signal appearing across resistor R1.
operated at high speed and if an obstructing passenger
breaks the light beam and then remains in the closing
path of the door, which is now traveling at reduced speed,
lthe leading edge of the door contacts that passenger with
Yminimal force and the door operating mechanism quickly
Coil B of the light beam switch is connected in the
anode circuit of tube AMT. »So long as the lightrbeam '
for each tube PHT is not obstructed, a positive potential
exists at point X of a value to cause suflìcient current
stops the closing door. Also, by merely stopping the
iiow through tube AMT and coil B to ymaintain the light
door while it is closing at the reduced speed, door move
merits and wear ‘and tear on the door operating equip
beam switch operated and in turn light beam switch ~
lO contacts B1 separated. DMA andV DMF designate, re
spectively, the armature and iield of a reversible direct
Should the light lbeam safety device become disabled
ment are minimized.
s
'at the expiration of the normal “door open dwell” period,
current driving motor lfor mechanisnrto operateV both
the` door is immediately moved toward its fully closed
position at the reduced speed Ywithout waiting for the
the car and hoistway doors' at a floor landing.
An understanding of the invention can best be gained Y
from a description of the sequences of voperations begin- ~
‘expiration of a predetermined “failure time,” as in prior
s
ning with a door opening operation. Assume that the
Features and Aadvantages of the invention will be seen
vcar is traveling between ñoor landings so that the iield
from the above and from the following description of
and brake switch H is operated. Under such conditions
the coil XNT of the hall time switch is maintained
energized and condenser C1 is maintained in fully
art arrangements.
' operation of one preferred embodiment when considered
in conjunction with the drawing `in which:
charged condition through engaged tield and brake switch
FIGURE l is a simplified schematic Wiring diagram
. -embodying the invention, as applied to that portion of
contacts H2.
,
Next assume that the car arrives at a ñoor landing in
response to a call lfor service at that landing and in so
control of the -elevator doors, including circuits for door
protective mechanisms; and
25 doing actuates door zone switch DZ to closed condition.
an elevator power and control system which relates to
Incident to the car stopping at the floor landing, tield
and brake switch H releases, separating its contacts H2
to interrupt the circuit of coil XNT and condenser C1.
»FIGURE ls is a spindle sheet Yfor use in side-by-side
alignment with FIGURE 1 for locating the coils and
>contacts in FIGURE l.
With reference to lthe drawing, to facilitate and simplify
Switch XNT is delayed in releasing, by the discharge of`
the disclosure, only certain portions of the elevator con 30 condenser C1 through its coil. Switch H also engages-its
trol circuits are shown and these relate to the control of
contacts H3 to complete a circuit for coil D0 of the
elevator doors at a floor landing. Also for convenience,
only the contacts of field and brake switch H are shown
door open switch, the circuit extending from supply line
W-l- through door open limit switch DOL, field and
»in the wiring diagram, this switch being operated in the
brake switch contacts H3, door zone »switch DZ, hall time
usual mannerby any one of several elevator control sys 35 switch contacts XN'Dl and'coil DO to supply line W-.
tems incident to the car starting Iand stopping at a floor
Door open switch DO, upon operation, engages its con
landing and only its contacts, as shown in the circuits of
tacts D01, short circuiting the now separated contacts
FIGURE l, being involved Vin the operation of the sub
ject invention.
'I‘he electromagnetic switches employed in the system
illustrated are designated `as follows:
H2 of the field and brake switch, completing the circuit
for coil XNT and condenser C1 to maintain switch XNT
40 operated. Door open switch D0 also separates contacts
D03, removing a short circuit from armature DMA and
'
engages contacts D02, DD4, completing a circuit for
B--Light beam switch
door motor armature DMA, causing it to rotate in a di-V
' DC--Door close switch
rection to move the door toward its fully opened position,
the latter circuit extending from supply line W -[-_ throughy
45
DIf--Door protective switch
D02, DMA and D04 to supply line W--.
XNT-_Hall time switch
As the door moves in the opening direction, door close`
VI_n the wiring diagram, identifying letters are applied to , limit switch DCL is actuated by door movement to
closed condition in preparation for a subsequent door
the coils of the electromagnetic switches and, with ref
closing operation. As the door arrives at its fully opened
erence numerals appended thereto, are applied to the
position, door open limit switch DOL is actuated by
vcontacts 'of the switches to differentiate between different
door movement to open condition, interrupting the circuit
-sets of contacts on the same switch, al1 contacts being
of coil D0 of the door open switch.
'shown for the unoperated condition of the switches.
Switch DO, upon releasing, separates its contacts D02
' Door close limit switch DCL and door open limit
, DO--Door open switch
switch DOL are actuated by door movement and are il
55 and D04, interrupting the circuit of armature DMA and .
lustrated -for the closed position of the door. Door zone
engages contacts D03, short-'circuiting armature DMA to
switch DZ is actuated by car movement to establish a
lzone at a floor Vlanding within which the door may be
opened »and is shown for the position'ofthe car at a
brake the door motor dynamically, stopping the opening
car door entranceway; two sources of light L1 and L2
for the photo tubes, arranged on the opposite side of the v
deemed suli'icient to allow for normal passenger transfer
movement of the door.
This switch also separates its
contacts D01, interrupting the circuit o-f coil XNT of
ñoor landing. Mechanical safety shoe switch SSC is 60 the hall time switch andV condenser C1, which condenser
starts to discharge through a portion of adjustable re
actuatableto open condition, as the leading edge of the
sistor R2 and coil XNT. 4Hall time switch XNT is de
car door encounters a person in its closing path and re
layed in releasing for a -time interval determined by the
turns 'to unactuated condition `as the leading edge of the
resistor R2 capacitor C1 timing circuit, which time
car door loses contact with that person.
I Supply lines W-l- and W- apply unidirectional pow 65 interval is termed the “door open dwell” period, during
which the doors are kept in their fully opened position
erto the circuits of FIGURE 1. Resistors and capacitors
to allow yfor normal passenger transfer at the landing
are designated generally as R Iand C, respectively. The
and at the expiration of which a door closing operation
circuits for the light ‘beam type protective mechanism
is initiated, as will be described.
Y
are illustrated in the upper portion of FIGURE 11 and
It may be noted that the duration of this “door open
include ‘two photo tubes PHTI and PHTZ, such as the
dwell” period may be preset to establish a time interval
RCA 91S gas iilled type, positioned on one side of the
at a ñoor landing for a particular installation by changing
the position of the »adjustable tap on resistor R2 to vary
forwhich they are provided; and an amplifying tube 75 the discharger time of condenser C1.
entranceway in line respectively with the photo tubes
3,047,096
5
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After condenser C1 has discharged to a value where
the excitation of coil XNT is no longer sufficient to hold
the hall time switch operated, switch XNT releases, en
gaging its contactsr XNTZ to complete a circuit for coil
DC of the door »close switch thereby initiating a door
closing operation, the circuit extending from supply line
W+ through DCL, SSC, XNTZ and DC to supply line
W--. Switch XNT also separates its contacts XNTl, for
purposes to be explained later.
Switch DC, upon operation, engages contacts DC1
preparing a circuit through contacts H1 for the coil DP
of the door protective switch. Switch DC also separates
contacts DCS removing the shortcircuit from armature
DMA and engages contacts DC2, DC4, completing a
circuit for armature DMA, causing the armature to ro
tate in a direction to move the door toward its closed
position, the latter circuit extending from supply line
W+ through DC4, DMA yand DC2 to supply line W--.
t
6
closing path of -the door after initial detection by the
light beam device, the safety devices cooperate íirst to
reduce the closing speed of the door, as the light beam
is broken, and then `to stop the door as the leading edge
of the door encounters the obstructingpassenger. ÁIn
this manner the closing movement of the ldoor is stopped
only when necessary. Also, inasmuch as the leading edge
of thedoor encounters the obstructing passenger to stop
the do-or while it is traveling at the reduced speed, the
possibility of injury to that passenger is minimized. Fur
thermore, stopping the door while it is traveling at the
reduced speed minimizes “shock” to the door operating
mechanism.
Now assume -that the obstructing passenger moves out
`of contact with the leading edge but remains in the clos
ing path of the door thereby releasing 'the mechanical
safety shoe switch SSC but maintaining the light beam
interrupted. As the mechanical safety shoe switch SSC
As the door begins to move in the closing direction,
returns to closed condition, a circuit for coil DC of the
door open limit switch DOL is actuated by door move 20 door close switch is completed through contacts XNTZ
ment to closed condition in preparation for a subsequent
and switch DCL. Switch DC operates, separating con
door opening operation, but without effect at this time
tacts D03 to remove the Vshort circuit from armature
since contacts XNTl are already separated, »as has been
DMA, engaging its contacts DC2 and DC4 in the arma
previously stated. '
ture, circuit yand contacts DCI in series with coil DP,
Now assume that after the expiration of the normal
causing the door to resume moving in the closing direc
“door open dwell” period and as the door begins moving
tion at reduced speed. It should be understood that if
in the closing direction, an intending passenger, arriving
the obstructing passenger not only moves out of contact
late, interrupts the light beam extending across the en
with the leading edge but also moves entirely out of the '
tranceway. As the light beam is thus interrupted, the
potential existing at point X is lowered, reducing the
magnitude of the current conducted by amplifying tube
closing path of the door, the light beam is then unob
30 structed and switch DP remains in released condition.
in such a case, as switch DC operates, the door moves
AMT and passing through coil B of the light beam
switch, connected in the anode circuit of tube AMT, suf
in the closing direction `at normal clos-ing speed, contacts
DCl engaging merely to prepare a circuit for coil DP
íiciently to cause switch B to release. Switch B engages
of the- door protective switch for a subsequent interrup
its contacts B1, completing a circuit through contacts
tion of the light beam. Should the light beam again be
DCI and H1 for coil DP of the door protective switch,
interrupted, contacts Bl engage causing switch DP to
which becomes self holding through its contacts DPI
operate and Kreduce the closing speed of the door below
thereby remaining in operated condition even if the light
normal, -as has been previously explained. It should be
beam is reestablished to separate contacts B1 again.
understood that once the closing speed yof the door is
Switch DP, upon operation, engages its contacts DP2, 40 thus reduced, the reduction in speed is maintained un
short circuiting la portion of resistor R3 to' reduce the
less the door is stopped by actuation of mechanical safety
amount of resistance -in parallel with `armature DMA
shoe switch SSC.
thereby decreasing the -current ñow through the »armature
As the door approaches its fully closed position,- door
to reduce the closing speed of the Vdoor a predetermined
close limit switch DCL is actuated by door movement
value below normal closing speed. In this manner late 45 to open condition interrupting the circuit of coil DC.
passenger transfer is detected before the leading edge of
Switch DC releases, separating its contacts DC2, DC4
the door encounters a transferring passenger and las a
and engaging its contacts DCS in the larmature circuit to
result the closing speed of the door is reduced to allow
stop the closing movement of the door.
'
such late passengers -to enter or leave the car.` At the
‘Incident to starting the car away from the ñoor land
same time, since the door `continues to close at reduced 50 ing, ñeld and brake switch H operates, engaging its con
speed instead of reopening or stopping, as -in the afore
tacts H2 to complete »a circuit for coil XNT and con
mentioned prior -art arrangements, late passengers tend
denser C1 in preparation for the next floor llanding stop.
to move quickly in or out of the car and the departure
As the car leaves the floor landing, door Zone switch -DZ
of the car is not unduly delayed. It may be noted that
is actuated by car movement to open condition, disabling
the adjustable tap on resistor R3 may be so‘positioned 55 the door open switch DO, preventing it from opening the
as to obtain the most practicable reduction in speed to
door between floor landings.
'
accomplish the foregoing benefits.
In summary, it may be noted that the safety devices
Next assume that while the door is thus closing at
cooperate to control the door movements after the nor
reduced speed, the leading edge of the door comes into
mal passenger transfer time has expired by providing
contact with a person- in its closing path, actuating me 60k advanced detection of an obstruction in the closing path
chanical safety shoe switch SSC to open condition to
of the door and upon such detection, effecting a reduction
interrupt the circuit for coil DC of the door close switch.
in the closing speed to allow passenger transfer. How
Switch DC, upon releasing, separates contacts DC2, DC4
ever, should the leading edge of the door encounter an
interrupting the armature circuit :and engages contacts
obstruction, the closing movement of the door is stopped.
DCS, short circuiting armature DMA t-o stop the closing 65 When the obstruction is removed from the leading edge
movement of the door thereby allowing lthe late transfer
of the door, the door resumes closing »at normal speed
ring passenger to move out of the path of the door. Con
provided that an obstruction is not detected in the en
tacts DCI also separate, interrupting the circuit of coil
tranceway by the light beam. If such an obstruction is
DP of the door protective switch. Switch DP releases,
so detected by the light beam, the door continues mov
separating its contacts DPZ to insert all of resistor R3 in
ing in the closing direction but at the reduced approach>
parallel with armature DMA in preparation for a resump
speed, enabling the obstructing person to move out of
tion of the door closing operation `at normal closing speed
its path before the `door reaches him. In this manner
once the obstruction is removed, 'as will be described
unnecessary door movements 'are minimized, yet lateV
later.
:transferring passengers are Áallowed to enter or leave the
It may be noted that should a person remain in the 75 car while a persistent effort is made to close the door
3,047,096
8
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subsequently reestablished only so long as said door con
and :discourage passengers aniving after :the expiration
tinues moving in the closing direction, object-detecting
of the normal door open dwell period from unduly in
terfering ywith the door closing operation. Since the -ad
vanced detection mechanism reduces the speed of the
door before the leading edge encounters theV obstruction,
means for detecting the presenceA of an object adjacent
:the stopping of the door is effected Iat this reduced ap
the leading edge of said door in the closing path of said
door, and swi-tching means operatively responsive to such
detection by said object-detecting means for causing said
{proach speed, minimizing shock to the door operating
mechanism. Also when the leading edge of the door
door operating means to stop the closing movement ofsaid
door and return said speed reducing means' to unactuated
strikes an'obstruotion in its path, it does so while the
door is traveling -at the reduced approach speed, min
imizing the danger of injury -to the transferring passenger
condition.
v
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2. A control for a horizontally sliding type elevator
door mounted for sidewis’e movement for opening and`
closing an elevator entranceway to passenger transfer,
and making practicable the use of relatively higher than
usual door closing speeds to obtain fas-ter door operation.
It should also be noted, that should the light beam
safety device become disabled, such as by failure of the
photo tubes PHT, lights L or amplifying tube AMT,
the door will close at reduced speed upon expiration
of the normal door open dwell period without waiting
said control comprising, door operating means for open
ing and closing operation of said door, object-sensingv
means including a transmitter of radiant energy Vposi
tioned on one side of said entranceway and directing a '
beam of radiant energyV horizontally across said entrance- y
way across the path of passengers transferring through
said entranceway, and a radiant energy receiver posi
prior art arrangements, thereby maintaining the car in 20 tioned on the other side of said entranceway in line with
said beam of energy and responsive to said beam, said
service while safeguarding transferring passengers.
object-sensing means being operatively responsive to in
By proper selection for a particular elevator installa
terruption of said beam by a transferring passenger dur
tion of the duration of the door open dwell period during
ing a door closing operation of said door operating means,
which normal passenger transfer may take place and of
means for reducing the speed of said door below normal
the amount by which the closing speed of the door is
for the expiration of a certain “failure” Vtime, as in
closing speed in closing, said speed reducing means being
actuated by operation of said object-sensing means and
remaining so actuated notwithstanding that said kbeam
reduced upon an initial advance detection of a late trans
ferring passenger, the subject door control appreciably
‘expedites elevator service and minimizes maintenance of
the door operating mechanism withoutrunduly hindering
subsequently is reestablished only so long as Vsaid door
30
passenger transfer.
Although the invention has been described according
to a >preferred embodiment using light beam and me
chanical safety shoe type safety devices, cooperating to
control door movements, the invention is just as> appli
' cable to a combination using the light beam type safetyV
device in conjunction and cooperating with a proximity
type detector which detects a person within a predeter
mined distance in advance of the leading edge of the
closing door. Such a proximity type detector is de
scribed and disclosed in the aforementioned Bruns patent
with particular reference to the upper portion of FIGURE
4 therein. With such an arrangement, by substitutingV
a pair of normally engaged contacts DPX of the auxiliary
door protective relay DPX shown in the aforementioned
FIGURE 4 .of the Bruns patent for the mechanical safety 45
shoe switch SSC in the circuits Vof FIGURE 1 herein, sub
` stantially the same operation is obtained as that disclosed
for the preferred embodiment.
»
As changes can be made in the above described system
and many apparently different embodiments of this inven
tion can be made without departing from the scope there
of, it is intended that all matter contained in the above
description or shown on the accompanying drawing be
interpreted as illustrative only and not ín a limiting
sense.
,
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What is claimed is:
1. A control for a horizontally sliding type elevator
door mounted for sidewise movement for opening and
`closing an elevator entranceway to passenger transfer,
said control comprising, door operating means for open 60
ing` and closing operation of said door, object-sensing
means including a/,transmitter of radiant energy posi
continues moving in the closing direction, object-detect
ing means for detecting the presence of an object con
tiguous the leading edge of said door in the closing path
of said door, and switching means operatively responsive
to such detection by said object-detecting means for caus
ing said door operating means to stop the closing move
ment of said door for only so long as said detection
persists, said speedreducing means returning to unactu
ated condition as said door is stopped by said door oper- '
ating means, said speed reducing means again being actu
atable by operation of said object-sensing means after
said detection ceases Ffor againreducing the closing speed
of said door.
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3. A control for «a sliding type elevator door mounted
for opening and closing an elevator entranceway to pas
senger transfer, said control comprising, proximity-detect-r
ing means operatively responsive to the presence of an
object in the closing path of said'door within a prede
termined range in vadvance of the leading edge of said,
door, switching means operatively responsive to operation
0f said proximity-detecting means, said switching means ,
being actuated from a lirst condition to .a second condi
tion when said proximity-detecting means responds to
the presence of an object within said range and being
returned to unactuated condition when said object ceases
to be within said range, door operating means'for opening
and closing said door, said dooropera-ting means being
operatively responsive to actuation of said switching
means by said proximity-detecting means to stop the
closing movement of said door upon actuation of said
switching means to said second condition and to resume l Y '
movmg said door in a closing direction upon return of
said switching means to unactuated condition, object
sensing means lincluding a radiant energy ytransmitter
positioned on one side of said entranceway and directing
way across the path of passengers transferring through 65 a beam. of energy across said entranceway across the path
said entranceway and a radiant energy receiver posi
of passengers transferring through said entranceway and
tioned on the other side of said entranceway in line with
a control device positioned on the other side of said
said beam of energy and responsive to said beam, said
entranceway in line with said beam of energy and opera
object-sensing means being operatively responsive to in
tively responsive to interruption of said beam «by a 11ans
terruption of said beam by a transferring passenger during 70 ferring passenger during a door closing operation of said
a door closing operation of said door operating means,
doer operating means, means for reducing the speed of
means for reducing the speed of said door below normal
said door below normal closing speed during closing
closing speed in closing, said speed reducing means being
movement of said door, said speed reducing means being
actuated by operation of said object-sensing means and
actuatable by operation of said controlV device of said
remaining so actuated notwithstanding that said beam is 75 object-sensing means, and holding means responsive to
tioned on one side of said `entranceway and directing a
beam of radiant energy horizontally across said entrance
3,047,096
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said door operating means for maintaining said actuated
speed reducing means actuated only so long as said door
continues moving in the closing direction.
l
an object to stop the closing movement of said door
and returning said switching means to said first condi
tion when detection ceases to resume closing said door,
speed reducing means for `reducing the speed of said door .
4. In an elevator system in which a car serves several
ñoor landings of a building, a control for a sliding eleva-> 5 ` in closing below normal closing speed, object-sensing
means including a radiant energy transmitter positioned
tor door mounted on said car for sidewise movement to
on one side of said entranceway and directing a beam
open and close an entranceway to said car, said control
of energy across said entranceway in the path of pas
comprising, door operating means for opening and clos
ing said doors; switching means operable from a first
sengers transferring through said entranceway _at said
condition to a second condition and to a third condi
tion, said switching means when in said ñrst condition
being effective to maintain said door operating means in
landings and a control device positioned on the side of
said entranceway opposite to said transmitter and in the
path of said energy beam, said -control device being op
a door-closing condition, when in said second condition
eratively responsive to interruption of said beam during
a door closing operation of said door operating means,
stop said door and when in said third condition being 15 said control device of said object-sensing means when
being etïective to cause said door operating means to
effective to maintain said door operating means in a
so responsive causing actuation of said speed reducing
means to „reduce the closing speed of said door, and
holding means responsive to such actuation, of said speed
cident to the car stopping at a floor landing in response
reducing means by said object-sensing means for main
to a call for service to actuate said switching means
from said second condition to said third condition for 20 taining said speed reducing means actuated only so long
as said door continues to move in a closing direction, said
initiating a door opening operation of said door oper
holding means also being responsive to said switching
ating means and lbeing effective to return said switching
means for releasing said speed reducing Vmeans upon
means to said second condition as the door arrives at its
fully opened position; timing means for actuating said
actuation of said switching means to said second condi
tion by said object-detecting means for restoring the
switching means from said second condition to said first
normal closing-speed of said door.
condition upon expiration of a predetermined time after
said door reaches its fully opened position to initiate a
References Cited in the file of this patent
closing operation of said door operating means, object
UNITED STATES PATENTS
detecting means for detecting the presence of an object
door-opening condition; initiating means operable in
against the leading edge of said door in the closing path 30
of said door, said detecting means actuating said switch
ing means to said second condition upon detection of such
2,634,828
V2,806,553
2,900,521
Bruns ______________ __ Apr. 14, 1953
Eames _________ _______ Sept. 17, 1957
Eames ______________ __ Aug. 18, 1959
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