US2559301A - Door control system - Google Patents

Door control system Download PDF

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US2559301A
US2559301A US118410A US11841049A US2559301A US 2559301 A US2559301 A US 2559301A US 118410 A US118410 A US 118410A US 11841049 A US11841049 A US 11841049A US 2559301 A US2559301 A US 2559301A
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door
contacts
switch
closed
relay
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Expired - Lifetime
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US118410A
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Harvey K Jones
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AT&T Corp
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Western Electric Co Inc
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    • EFIXED CONSTRUCTIONS
    • E05LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05FDEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F15/00Power-operated mechanisms for wings
    • E05F15/60Power-operated mechanisms for wings using electrical actuators
    • E05F15/603Power-operated mechanisms for wings using electrical actuators using rotary electromotors
    • EFIXED CONSTRUCTIONS
    • E05LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05YINDEXING SCHEME RELATING TO HINGES OR OTHER SUSPENSION DEVICES FOR DOORS, WINDOWS OR WINGS AND DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION, CHECKS FOR WINGS AND WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05Y2900/00Application of doors, windows, wings or fittings thereof
    • E05Y2900/10Application of doors, windows, wings or fittings thereof for buildings or parts thereof
    • E05Y2900/13Application of doors, windows, wings or fittings thereof for buildings or parts thereof characterised by the type of wing
    • E05Y2900/146Shutters

Description

July 3, 1951 H. K. JONES DOOR CONTROL SYSTEM 4 Sheets-Sheet 1 Filed Sept. 28, 1949 INVEN 70/? H K. JONES ATTORNEY July 3, 1951 H. K. JONES DOOR CONTROL SYSTEM 4 Sheets-Sheet 2 Filed Sept. 28, 1949 FIG. 3
//v vE/v TOR H. A. JONES BY A TTORNEV FIG. 4
JERRY 391 H. K. JONES DOOR CONTROL SYSTEM 4 Sheets-Sheet 3 H. K JONES INVENTOR We r A H F a Filed Sept. 28, 1949 July 3 W51 H. K. JONES DOOR CONTROL SYSTEM 4 Sheets-Sheet 4 Filed Sept. 28, 1949 m/vE/v rop H; K JONES AT TORNEV i atentecl uly 3, 195i DOOR CONTROL SYSTEM 7 Harvey K. Jones, Parkville, Md., assignor to Western Electric Company, Incorporated, New York, N. Y., a corporation of New York Application September 28, 1949, Serial No. 118,410
4 Claims.
This invention relates to door control systems, and more particularly to systems for interlockably controlling doors of auto courts.
Shipping operations to and from buildings, such as, for example, factories and warehouses, often require having doors to the buildings open for considerable periods of time in cold weather.
Two doors have been used so that one or the other of the doors might be closed while the other is open. However, both doors often would be open at the same time. There have been some systems for interlocking the doors so that only one door might be open at a given time but these systems provided no flexibility as to the extent each door could be opened.
An object of the invention is to provide new and improved door control systems.
A further object of the invention is to provide new and improved systems for interlockably controlling doors of auto courts.
An apparatus illustrating certain features of the invention may include a chamber having an entrance doorway and an exit doorway, an entrance door mounted in the entrance doorway for movement between an open position and a closed position, a door mounted in the exit doorway for movement between an open position and a closed position therein, a reversible electric motor for moving the entrance door, a source of electrical power, a limit switch operable by the exit door for preventing operation of the motor when the exit dooris not closed, a second reversible electric motor for moving the exit door, a second limit switch operable by the entrance door for preventing operation of the second-mentioned motor when the entrance door is not closed, means for actuating the first-mentioned motor to open and close the entrance door, and means for actuating the second-mentioned motor to open and close the second-mentioned door.
A complete understanding of the invention may be obtained from the following detailed description of an apparatus forming a specific embodiment thereof, when read in conjunction with the appended drawings, in which: 7
Fig. 1 is a fragmentary, vertical section of an apparatus forming one embodiment of the invention;
Fig. 2 is an enlarged, fragmentary, vertical section of a portion of the apparatus shown in Fig. 1;
Fig. 3 is an enlarged, fragmentary, vertical section taken along line 33 of Fig. 1;
Fig. 4 is an enlarged, fragmentary, vertical section taken along line 44 of Fig. l;
Fig. 5 is a diagrammatic view of a portion of a control system forming part of the apparatus, and
Fig. 6 is a diagrammatic view of the remainder of the control circuit.
Referring now in detail to the drawings, there is shown therein an interlocking system for controlling the operations of an exterior door I and interior door 3 of an auto court 9 (Fig. 1) so that the exterior door cannot be opened if the interior door is open. The system includes a [manually operable, momentary switch l0 (Fig. 5) positioned between a grounded conductor and a conductor of a threephase power line II for energizing a holding relay winding l2, and a normally closed limit switch M (Fig. 6) closed when the interior door is moved from its closed position and opened by a lug I5 movable by a distributor screw l3 (Fig. 3) driven in synchronization With the interior door when the interior door is closed. If the interior door is open, the limit switch l4 (Fig. 6) is closed and a winding 16 of a relay I1 is energized to close contacts I8. The relay winding I2 is energized when the contacts l8 and the switch II] are closed, and closes holding contacts 20 to light a lamp 22 indicating to an attendant inside the building that someone is at the exterior door and wishes the attendant to close the interior door. A bell 24 (Fig. 5) is energized only while the switch I 0 is held closed.
If the interior door 8 (Fig. 1) is closed so that the switch I4 is open, to open the exterior door 1, one of three sets of manually operable interlocked switch contacts 26 and 21, 28 and 29, and 3D and 3|, located outside the exterior door, in-
side the exterior door and inside the interior door respectively, may be actuated to open one of the contacts 26, 28 and 30 and close the corresponding one of the contacts 21, 29 and 3| to energize a holding relay winding 32 of a relay 33 which closes holding contacts 34 and contacts 36-36 to energize a motor 38 to drive a shaft 31 in a direction to open the exterior door. As the exterior door arrives at its open position a limit switch 40 is opened by a lug 39, movable by a screw 4| driven in synchronization with the movement of the door 1 to stop the motor 38, and a limit switch 42 was closed as the door 1 moved away from its closed position and a lug 43 moved out of engagement with the switch 42 to'permit subsequent closing of the door.
Closing of the switch 42 causes energization of a relay winding 44 of a relay 45 to close switch contacts 46 in series with an outside thermostatic switch 48 and in parallel with an inside thermostatic switch 50. The thermostatic switch 50 is closed if the temperature at its location is below room temperature, and the thermostatic switch 48 is closed when the temperature outside the exterior door "I is below 50 F. When either of these thermostats is closed and a manually operable contactor 41 is in engagement with a contact 49 in series with the thermostatic switches 48 and 50, a relay winding 52 of a relay 53 is energized to close contacts 54-54 to a heater fan motor cuit through a relay winding I08 of a relay I09, the limit switch I4 having been closed by opening the interior door. The relay winding I88 then closes motor contacts IIO-I I0 and holding con- 56. The motor 56 drives a fan 51 (Fig. 1) of a Certain features of the heaters 55 and 58 and the control circuit thereof are disclosed and claimed in 'copen'ding applicationSerial No. 118,318, filed September 28, 194.9, by H. W. Hubers for Methods of and Apparatus for Controlling Temperatures of Rooms.
After the exterior door 'I is opened, a truck may be driven up to the interior door 8 and one of manually operable contacts 66, 62 and 64, located outside the exterior door I, inside the auto court and inside the building, respectively, may be actuated manually to close a corresponding one of contacts 66, 68 and I0. (Fig. 5) interlocked therewith. This energizes a relay winding 12 of a relay I3 to close holding contacts 14 and motor controlling contacts I6--16to drive the motor 38 in a door-closing direction. When the exterior door gets to closed position, the limit switch 40 is closed and the limit switch 42 is opened to stop the motor 38 and to break the circuit to the relay winding 44. A limit switch 15 (Fig. 4) openable by a lug ll driven by a screw 18 is closed whenever the door I is not fully open to. cause energization of an exhaust fan motor 19 (Fig. 6). Deehergization of the winding 44 (Fig. 5) opens contacts 46 to stop energization of the motor 56 by outside thermostat 48.
' After the exterior door l (Fig.1) is closed, the interior door 8 may be opened. If it is desired to open the interior door 8 to its. fullest extent, one of manually operable contacts 80 and 82 (Figs. 1 and 6) is opened, whereby a corresponding one of contacts 84 and 86 interlocked therewith is closed. This closes a circuit through the closed one of the contacts 84 and 86 through a relay winding 88 of a relay 89 to close relay contacts 96 90 and 92- to cause energization of an interior door motor 94. to drive a shaft 93 in a direction opening the interiordoor. The interior door. is moved upwardly, permitting the limit switch I4.toclose, until it has been raisedto its wide open position atwhich' time a limit switch 96 is opened by a lug 95 to stop the motor 94. As the interior door was raised to a predetermined partially open position, a limit switch 98 was opened by a lug 91 without affecting the motor circuit. The lugs 95 and Blare movable by a screw 99 and the screw I3, respectively, in synchronization with the movement of the interior door.
Toclose the interior door 8, one of manually operable switch contacts, I00 and I02 (Figs. 1 and 6) located in the auto court and in thebuilding respectively, is opened, thereby closing the corresponding one of contacts I04. and I06. Closing one of the contacts I04 and I06. closes a cirtacts II2 'to reverse the motor 94 to close the interior door. As the door is moved closed, the limit switches 96 and 98 are closed successively by movement of the lugs 95 and 9] and the limit switch I4 is opened at the end of the closing movement, thereby deenergizing the motor 94.
To open the inner door to its partially open position only so that time may be saved in the opening of that door in instances when the door 8 need not be fully opened for loading and unloading operations, one of manually operable, momentary switch contacts I28 and I22 is opened, thereby closing the corresponding one of contacts I24 and I25 interlocked with the contacts I20. and I22, respectively, which closes the circuit to a relay winding I28 of a relay I29. This closes holding contacts I30. and contacts I32, and opens contacts I34 to prevent operation of the circuit for opening the door completely. Closing of contacts I30 keeps the relay winding I28 energized, and closing: of contacts I32 causes energization of the relay winding 88 to run the motor 94 in a door-opening direction. As the interior door reaches its partially open position, the limit switch 98 (Figs. 3 and 6) is opened by the lug 91 to stop the door at that position.
The interior door may be closed from its partially open position by actuating one of the switch contacts I00 and I62. Closing of the in-. terior door causes the lug 15 to open the limit switch I4, which deenergizes the relay i6 so that contacts I40 reclose to permit the exterior door to be opened. Similarly, when the exterior door 1 is openthe limit switch 42 is closed so that the relay winding 44 is energized, thereby opening contacts I42 preventing operation of the interior door 8.
Limit switches I50 (Fig.- 6) and I52 (Fig. 5) are openable by manually operative hoists opening and closing the interior door 8 and the exterior door I, respectively, to stop push button operation of that door. being operated by the manually operative hoist therefor. Switch con-. tacts I60. and I62 interlocked with the switchv contactsand82, respectively, protect the wind-. ings 88 and I08, which-are mechanically interlocked, from strain. if both one of the contacts 80and 82v and one of the contacts I00 and I02 are actuated simultaneously by accident.
Whenever the exterior door I is moved away from its fully closed position, the switch contacts. 42 are closed to energize the winding to close switch. contacts, in serieslwith the outside thermostatic switch 48. If the temperature outside the door. I is below the predetermined minimum temperature at which the switch 48 closes, the switch 48 is closed and causing the relay winding 52 to be energized to close contacts 5454 to the heater fan motor 56:. The motor 56 drives above said value, above which the court would not.
bev unduly cooled when the exterior door is open, the switch 4.8.is.open and only the indoor thermostatic switch v5!]v controls the operation of the fan motor 56. Whenever: the exterior door is in its closed position, the relay contacts 40 in series with the switch 48 are open so. that the outside temperature then has no effect on the operation of the fan motor 56 (Fig. 5).
Contacts I80 and I62 of a key-operable switch I84 are provided in series with relay windings 44 and I6, respectively. In periods of cold weather the contacts I80 and I82 are closed so that the relays I! and 45 are operative to interconnect the circuits controlling the opening andclosing of the doors. In summer, when no heating of the auto court is needed, the contacts I80 and I82 are opened so that each door may be operated inde pendently of the other and the circuit to the thermostatic switches 48 and 50 is broken. A key switch I90 may be opened in summer to prevent operation of the exhaust fan motor I9 since the exterior door is kept open during warm weather and exhaust fumes from trucks need not be drawn artificially from the auto court.
Operation Assuming that a truck comes to the outside of the exterior door 'I, the driver actuates the contact 26 located outside the exterior door. If the interior door 8 is open, the switch I4 is closed so that the relay winding I6 is deenergized, thereby opening contacts I40 to prevent opening the exterior door and closing contacts I8 so that the bell 22 may be actuated. Assuming the interior door to be open, the exterior door will not open. The'driver then closes the switch I to light the lamp 22 indicating to an attendant inside that a truck is at the door, and the attendant closes the interior door, which deenergizes the relay winding It to close contacts I40 and open contacts I8. Opening of contacts I8 breaks the circuit to the lamp 22. The bell 24 is energized only while the switch I0 is held closed.
The attendant then actuates one of the sets of interlocked contacts 28 and 29, and 30 and 3| located inside the interior door and inside the exterior door, respectively, to open one of the contacts 28 and 30 and close the corresponding one of the contacts 29 and 3! to energize the motor 38 in a direction to open the exterior door. As the exterior door arrives at its open position, the lug 39 (Fig. 3) opens the limit switch 40 to stop the motor 38 and closes the limit switch 42 to permit closing the exterior door.
Closing of the switch 42 (Fig. which is closed whenever the exterior door is not fully closed, causes energization of the relay winding 44 to close switch contacts 46 in series with the outside thermostatic switch 48. The thermostatic switch 50 is closed if the temperature at its location is below the desired room temperature. If the outside temperature is sufiiciently below the desired room temperature, the switch 48 is closed. When either of these switches is closed, the relay winding 52 is energized to close the contacts 5454 to the heater fan motor 55, and the motor 58 drives the fan 5'! (Fig. 1) to blow a curtain of warm air across the door opening thereby preventing undue'cooling of the auto court.
After the exterior door I is opened, the truck backs up to the interior door 8, and an attendant or the driver actuates one of switch contacts 60, 62 and 64 (Fig. 5) to close the corresponding one of switch contacts 66, 68 and III. This energizes the motor 38 in a door-closing direction. When the exterior door is moved to its closed position, the lug 4| (Fig. 4) causes the limit switch 40 to close, and opens the limit switch 42 to stop the motor 38 (Fig. '5) and to break the circuit to the relay winding 44. Deenergization of the winding 44 opens the contacts 46 to stop energization by means of outside thermostat 48 of the heater 7 motor 56.
The interior door 8 (Fig. 1) then may be opened. If it is desired to open the interior door to its fully open position, one of switch contacts and 82 (Fig. 6) is opened, whereby the corresponding one of switch contacts 84 and 86 is closed. This causes energization of the interior door motor 94 in a direction opening the interior door. The interior door is moved upwardly as viewed in Fig. 1, the lug I5 (Fig. 3) permitting the limit switch I4 to close, until it has been raised to its wide open position at which time the lug 95 opens the limit switch 9!: to stop the motor 94. As the interior door was moved past its partially open position, the lug 97 opened the limit switch 98 without affecting the motor circuit.
After the truck is loaded or unloaded, one of the switch contacts I00 and I02 (Fig. 6) is opened manually, thereby closing the corresponding one of the switch contacts I04 and I08. Closing the one of the contacts I04 and I06 closes a circuit through the relay winding I88 and the limit switch I4, which was closed by opening the interior door 8. The relay winding I08 then closes motor contacts IIO-I I0 and holding contacts H2 to reverse the motor 94 to close the interior door. As the interior door is moved closed, the limit switches 98 and 98 are closed successively, and the limit switch I I is opened at the extreme of the closing movement, thereby deenergizing the motor 94.
If it is desired to open the interior door 8 only to its partially open position, one of switch contacts I 20 and I22 is opened manually, thereby closing the corresponding one of the contacts I24 and I26 which closes the circuit to the relay winding I28. This closes holding contacts I30 and contacts I32, and opens the switch contacts I34 to prevent operation of the circuit for opening the interior door to its fully open position. Closing of contacts I30 keeps the relay winding I28 energized and closing of the contact I32 causes energization of the relay winding 88 to run the motor 94 in a door-opening direction. As the interior door reaches its partially open position, the lug 94 opens the limit switch 98 to stop the door at that position. The door may be closed as described hereinabove in closing it from its fully open position.
Whenever the interior door 8 is closed, the limit switch I4 is opened by the lug l5 (Fig. 3) to deenergize the relay winding I6 so that the contacts I40 reclose to permit the exterior door to be opened. Whenever the interior door is opened even partially, the switch I4 is closed to prevent opening the exterior door. Similarly, Whenever the exterior door I is closed the limit switch 42 is opened so that the relay winding 44 is deenergized, thereby closing contacts I42 to permit operation of the interior door, and if the exterior door is opened even partially, the switch 42 is closed to cause opening of the contacts I42, thereby preventing opening the interior door.
What is claimed is:
1. A door control system, which comprises a chamber having an entrance doorway and an exit doorway, an entrance door mounted in the entrance doorway for movement between an open position and a closed position, a second door mounted for movement in the exit doorway, a reversible electric motor for moving the entrance door, a source of electrical power, a limit switch closable by the second-mentioned door when the second-mentioned door is not closed, a second reversible electric motor for moving the second-mentioned door, a second limit switch closable by the entrance door when the entrance door is not closed, a blocking relay having a winding in series with the first-mentioned limit switch and the source of electrical power and contacts for preventing operation of the firstmentioned motor when the second-mentioned door is not closed, a second blocking relay having a winding ,in series with the second-mentioned limit switch and the source of electrical power and contacts for preventing operation of the second-mentioned motor when the first-mentioned door is not closed, means including a manually operable switch having normally open contacts in parallel with the winding of the firstmentioned relay and the first-mentioned limit switch for actuating the second-mentioned motor to open and close the second-mentioned door, and means including a manually operable switch having normally open contacts in parallel with the winding of the second-mentioned relay and the second-mentioned limit switch for actuating the first-mentioned motor to open and close the firstmentioned door.
2. A door control system, which comprises a chamber having an entrance doorway and an exit doorway, an entrance door mounted in the entrance doorway for movement between an open position and a closed position, a second door mounted for movement in the exit doorway, a reversible electric motor for moving the entrance door, a source of electrical power, a limit switch closable by the second-mentioned door when the second-mentioned door is not closed, a second reversible electric motor for moving the secondmentioned door, a second limit switch closable by theentrance door when the entrance door is not closed, a blocking relay having a winding in serie with the first-mentioned limit switch and the source of electrical power and contacts for preventing operation of the first-mentioned motor when the second-mentioned door is not closed, a second blocking relay having a winding in series with the second-mentioned limit switch and the source of electrical power and contacts for preventing operation of the second-mentioned motor when the first-mentioned door is not closed, a lock switch having contacts in series with the winding of the first-mentioned relay and the source of electrical power and contacts in series with the winding of the second-mentioned relay and the source of electrical-power for selectively connecting and disconnecting the windings to and from the source of electrical power, means including a manually operable switch having, normally open contacts in parallel with the winding of the first-mentioned relay and the first mentioned limit switch for actuating the secand-mentioned motor to open and close the second-mentioned door, and means including a manually operable switch having normally open contacts in parallel with the Winding of the second-mentioned relay and the second-mentioned having a relay winding andcontacts for can mating the motor to the source of power to energize the motor to open the door when that wind ing is energized, means including a second relay having a relay winding and contacts for connecting the motor to the source of power to energize the motor to close the door when that winding is energized, a limit switch closed when the door is in its closed position, openable by the door when the door arrives at its fully open position and connected in series with the winding of the first-mentioned relay and the source of power, a second limit switch closed when the door is not in its closed position, openable by the door when the door arrives at its closed position and connected in series with the winding of the second-mentioned relay and the source of power, a third limit switch closed when the door isin its closed position, openable by the door when the door arrives at its partially open position and connected in series with the winding of the firstmentioned relay and the source of power and in parallel with the first-mentioned limit switch, a manually operable, normally open, switch connected in series with the relay winding of the second-mentioned relay and the second-mentioned limit switch and in parallel with the thirdmentioned limit switch, a second manually-op erable, normally open, momentary switch connected in series with the relay winding of the first-mentioned relay and the first-mentioned limit switch, a third relay including a relay winding connected in series with the source of power and the third-mentioned limit switch and in parallel with the relay winding of the firstmentioned relay, normally open contacts in series with the winding of the first-mentioned relay and the third-mentioned limit switch and in parallel with the first-mentioned manually operable switch and normally closed contacts in parallel with the last-mentioned contacts and in series with the first-mentioned manually operable switch and the first-mentioned limit switch, and a third manually operable, normally open switch in series with the second-mentioned limit switch and the winding of the second-mentioned relay.
4'. A door control system, which comprises a room having a doorway, a door movable with respect to the doorway between closed position, a partially open position and a fully open position, a three-phase electric power source, a reversible three-phase motor for moving the door, means including a relay having a relay winding and contacts for connecting the motor to the source ofi power to energize the motor to open the door when that winding is energized, means including a second relay having a relay winding and contacts for connecting the motor to the source of power to energize the motor to close the door when that winding is energized, a limit switch closed when the door is in its closed position,
openable by the door when the door arrives at its fully open position and connected in series with the winding of the first-mentioned relay and the source of power, a second limit switch closed source of power, a third limit switch closed when the door is in its closed position, openable by the door when the door arrives at its partially open position and connected in series with the windingv of the first-mentioned relay and the source of power and in parallel with the firstmentioned limit switch, a manually operable, normally open, momentary switch connected in series with the relay winding of the first-mentioned relay and the first-mentioned limit switch and in parallel with the third-mentioned switch, a second manually operable, normally open, momentary switch connected in series with the relay winding of the second-mentioned relay and the second-mentioned limit switch, a third relay including a relay winding connected in series with the source of power and the third-mentioned limit switch and in parallel with the relay winding of the first-mentioned relay, normally open contacts in series with the winding of the first-mentioned relay and the third-mentioned limit switch and in parallel with the first-mentioned manually operable switch and normally closed contacts in parallel with the last-mentioned contacts and in series with the first-men- 10 tioned manually operable switch and the flrst mentioned limit switch, and a third manually operable, normally open, momentary switch in series with the third-mentioned limit switch and the winding of the third-mentioned relay, each of said relays including holding contacts in parallel with the manually operable switches in series with the relay windings thereof.
HARVEY K. JONES.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Name Date White Nov. 11, 1924 Mattingly et a1. Jan. 2, 1934 Fogal June 30, 1936 Number
US118410A 1949-09-28 1949-09-28 Door control system Expired - Lifetime US2559301A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2820627A (en) * 1953-03-30 1958-01-21 Nat Pneumatic Co Inc Door operation and control
DE1260748B (en) * 1953-12-11 1968-02-08 Carl Kauffmann Arrangement of a roller shutter, which can be closed automatically in the event of fire, as a cover for a means of transport set up for continuous movement, e.g. B. an escalator
US20120241108A1 (en) * 2011-03-25 2012-09-27 Thatcher Oaks, Inc. Fabric security barrier, system and/or method for impeding entry into a space

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1515376A (en) * 1921-08-15 1924-11-11 Truscon Steel Co Control system for ventilating sash units
US1942253A (en) * 1929-03-06 1934-01-02 Westinghouse Electrie And Mfg Elevator door operating apparatus
US2045765A (en) * 1931-03-28 1936-06-30 Anna E Fogal Door operator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1515376A (en) * 1921-08-15 1924-11-11 Truscon Steel Co Control system for ventilating sash units
US1942253A (en) * 1929-03-06 1934-01-02 Westinghouse Electrie And Mfg Elevator door operating apparatus
US2045765A (en) * 1931-03-28 1936-06-30 Anna E Fogal Door operator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2820627A (en) * 1953-03-30 1958-01-21 Nat Pneumatic Co Inc Door operation and control
DE1260748B (en) * 1953-12-11 1968-02-08 Carl Kauffmann Arrangement of a roller shutter, which can be closed automatically in the event of fire, as a cover for a means of transport set up for continuous movement, e.g. B. an escalator
US20120241108A1 (en) * 2011-03-25 2012-09-27 Thatcher Oaks, Inc. Fabric security barrier, system and/or method for impeding entry into a space
US8714230B2 (en) * 2011-03-25 2014-05-06 Sennco Solutions, Inc. Fabric security barrier, system and/or method for impeding entry into a space

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