US2203358A - Selective remote control - Google Patents

Selective remote control Download PDF

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US2203358A
US2203358A US180953A US18095337A US2203358A US 2203358 A US2203358 A US 2203358A US 180953 A US180953 A US 180953A US 18095337 A US18095337 A US 18095337A US 2203358 A US2203358 A US 2203358A
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contact
relay
network
energized
selector
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US180953A
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Koenig Werner
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Landis and Gyr AG
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Landis and Gyr AG
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04C—ELECTROMECHANICAL CLOCKS OR WATCHES
    • G04C11/00—Synchronisation of independently-driven clocks
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00007—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using the power network as support for the transmission
    • H02J13/00009—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using the power network as support for the transmission using pulsed signals
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00007—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using the power network as support for the transmission
    • H02J13/0001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using the power network as support for the transmission using modification of a parameter of the network power signal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/20—Smart grids as enabling technology in buildings sector
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52—Outage or fault management, e.g. fault detection or location
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/121—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using the power network as support for the transmission

Definitions

  • the invention relates to a receiving device for a remote control system connected to an alternatin'g current network and designed to control or effect definite operations, and more particularly to such receiving devices controlled by a transmitter, and wherein the selection or control of the different operations is determined by the length of time between two interruptions of the alternating current network.
  • the invention consists in the novel parts, constructio arrangements, combinations and improvements herein shown and described.
  • Figures 1 and 2 show two constructional forms of the invention, wherein a synchronous motor is employed as the driving mechanism.
  • Receiving devices embodying the invention are applicable to the remote control of counting mechanisms of electric multiple tariff meters
  • a contact arm of a contact selector is driven after the first interruption of the circuit by a driving mechanism running at a constant speed, making a quite definite motion and held without potential,
  • the contact selector can be connected through its contact arm and through a back contact of the relay (i. e., a contact on which the movable tongue normally rests) tor of the network, and the device to be controlled connected to at least one selector contact of the relay corresponding to the associated length or period of time between two interruptions.
  • the driving means for the contact selector may be a synchronous motor, oil-normal, or restoring switch controlled by the contact selector.
  • the winding of the contact relay may be connected on one side to one conductor of the network and on the outer side through its operating contact to the other network conductor, and also from time to time to so that contact of the contact selector that is just to one conducwhich. is controlled by an.
  • this contact relay may operate with delayed attraction, the winding of the relay being connected directly to the network.
  • I is the contact selector of the receiving device; contact arm 2 is connected to a back contact 3 of a relay 4; the initial contact 5 is connected on one side through oil-normal switch I to one network conductor A and on the 1. other side through an excitingwinding 6 of a synchronous motor I to the network conductor B; contacts 9 to II are connected to winding I2 and to a holding contact I3 of the relay 4; also contacts I4, I5 are each connected through a winding I6, II of a tilting relay III to network conductor B.
  • a movable contact I9 of relay 4 coacting with holding contact I3 and back contact 3 and controlled by winding I2, is connected to network conductor A.
  • Tilting relay I8 controls a change-over contact arm 24 coacting with contacts 22, 23.
  • the relay 4 is again energized, contact arm 2. of contact selector contact I0. Movable contact I9 is attracted, whereby contact arm 2 is again without potential. Therefore, since there is no interruption of the network A, B, winding II of tilting relay I8 is not energized when contact arm 2 comes on to contact I5. On reaching zero position of the contact arm 2, the off-normal switch 8 is again opened and the synchronous motor 1 thereby stops. Since the network remains switched in, relay 4 will still hold movable contact I9 on holding contact I3.
  • contact arm 2 of selector I opening of the Any accidental interruptions of network A, B after restoration of the network potential result in nothing more than idle rotation of contact arm 2.
  • contact arm 2 is set in rotation.
  • relay 4 which was de-energized on the interruption is again energized, and thereby contact arm 2 is rendered without potential.
  • I5 no energization of windings I6, I 1' of tilting relay I8 can therefore take place. It may then happen that just at this moment a further interruption of network A, B occurs of a duration which is equal to or less than the selected interruption. This is however not to be assumed, and under practical operating conditions rarely, if ever, happens.
  • WhatI'claim is: '1.,A.circuit selector associated with a normally closed power supply network and responsive to the period of time elapsing between two successive momentary interruptions of the network, comprising 'a constant speed electric motor to be energized from the network, a plurality of contacts, a wiper driven by said without sacrificing its chief advan-.
  • a relay connections whereby the relay is energized from the network when the network is closed, connections from the network to the motor for initially energizing the motor and moving the wiper from initial position, said connections including the wiper, one of the selector contacts insaid initial position and a back contact of the relay, means for connecting the motor to the including the back contact of the relay, the wiper and respective other of said will accomplish selection.
  • said means for delaying the opening of the motor connections through the back contact of the relay including a circuit established through the back contact of the relay, the wiper, another 3.
  • the delaying of the opening of the motor connections through the back contact of the relay upon reclosure of the network to allow the motor to meanwhile move the wiper from its initial position is accomplished by making said relay of the delay or retarded action type.

Description

-$ Y/VCV/RO/VOJS MOTOR.
June 4, 1940. w. KOENIG SELECTIVE REMOTE CONTROL Filed Dec. 21, 1937 A3 3 /1 7 arr-wen SWITCH OFF- NORM/1L W a ATTORNEYS l/V VE N TOR Patented June 4, 1940 I 23.3358 SELECTIVE REMOTE CONTROL Werner Koenig, Lucerne. Switzerland, usignor to Landis .2 Gyr, A-G., Zug, Switzerland, a corporatlon of Switzerland Application December 21, m1, Serial No.1,953 In Switzerland December 24, 1936 3 Claims.
The invention relates to a receiving device for a remote control system connected to an alternatin'g current network and designed to control or effect definite operations, and more particularly to such receiving devices controlled by a transmitter, and wherein the selection or control of the different operations is determined by the length of time between two interruptions of the alternating current network.
Objects and advantages of the invention will be set forth in part hereinafter and in part will be obvious herefrom or may, be learned by practice with the invention, the same being realized and attained by means of the instrumentalities and combinations pointed out in the appended claims.
The invention consists in the novel parts, constructio arrangements, combinations and improvements herein shown and described.
The accompanying drawing, referred to herein and constituting a part hereof, illustrates one embodiment of the invention, and together with the description, serves to explain the principles of the invention.
Figures 1 and 2 show two constructional forms of the invention, wherein a synchronous motor is employed as the driving mechanism.
Receiving devices embodying the invention are applicable to the remote control of counting mechanisms of electric multiple tariff meters,
the switching-on and off of lighting networks,
the synchronization of clocks, and are also applicable to the'control of many other kinds of operations. l
In accordance with the invention a contact arm of a contact selector is driven after the first interruption of the circuit by a driving mechanism running at a constant speed, making a quite definite motion and held without potential,
by means of a contact relay energized by the network potential from an adjustable point of the selected length or period of time, and receives I potential after the second interruption of the circuit. The contact selector can be connected through its contact arm and through a back contact of the relay (i. e., a contact on which the movable tongue normally rests) tor of the network, and the device to be controlled connected to at least one selector contact of the relay corresponding to the associated length or period of time between two interruptions. The driving means for the contact selector may be a synchronous motor, oil-normal, or restoring switch controlled by the contact selector. The winding of the contact relay may be connected on one side to one conductor of the network and on the outer side through its operating contact to the other network conductor, and also from time to time to so that contact of the contact selector that is just to one conducwhich. is controlled by an.
ahead of a contact connected to the device to be controlled; or this contact relay may operate with delayed attraction, the winding of the relay being connected directly to the network.
Referring now to the exemplary embodiment of Fig. l, I is the contact selector of the receiving device; contact arm 2 is connected to a back contact 3 of a relay 4; the initial contact 5 is connected on one side through oil-normal switch I to one network conductor A and on the 1. other side through an excitingwinding 6 of a synchronous motor I to the network conductor B; contacts 9 to II are connected to winding I2 and to a holding contact I3 of the relay 4; also contacts I4, I5 are each connected through a winding I6, II of a tilting relay III to network conductor B. A movable contact I9 of relay 4, coacting with holding contact I3 and back contact 3 and controlled by winding I2, is connected to network conductor A. Tilting relay I8 controls a change-over contact arm 24 coacting with contacts 22, 23.
In the diagram of connections shown in Figure 1 it is assumed that network A, B is interrupted. Synchronous motor 1 and consequently also con- 25 tact selector I are then at rest. On switching in the alternating current network A, B circuit A, I9, 3, 2, 5, 6, 15 receives current. Synchronous motor I is thereby set in operation and will start contact arm 2 of contact selector I rotating. Shortly after synchronous motor I is started the off-normal switch 9 is closed, so that the supply of current to winding 6 of synchronous motor I is now effected through this switch. As soon as contact arm 2 comes on to contact 9, relay 4 is 35 energized through circuit A, I9, 3, 2, 9, I2, B. Its movable contact I9 is thereby raised from contact 3, and brought into connection with holding contact I3. Thus primarily a holding current circuit A, I9, I3, l2, B is completed for relay 4, so that 40 the latter remains energized even when contact arm 2 slides away from contact 9. In the second place contact arm 2 is now.without potential.
As soon as contact arm 2 reaches contact I4, a short second interruption of network A, B is 45 effected from the transmitter (not shown). The relay 4 is therefore de-energized, whereby movable contact I9 drops and comes into engagement with contact 3. After the switching in again of the network A, B contact arm 2 of con- 50 tact selector I again receives potential. Since the arm 2 is still on contact I4, winding I6 of tilting relay I8 is energized. The change-over contact arm 24 is consequently moved from contact 23 and connected to contact 22. Thus the conductor connected to change-over contactjarm 24 is connected to the conductor connected to contact 22. For example, by this actuation of the tilting relay l8 the change over of the counting 50 mechanism of a multiple tariff meter to low tarifl' can be effected.
The relay 4 is again energized, contact arm 2. of contact selector contact I0. Movable contact I9 is attracted, whereby contact arm 2 is again without potential. Therefore, since there is no interruption of the network A, B, winding II of tilting relay I8 is not energized when contact arm 2 comes on to contact I5. On reaching zero position of the contact arm 2, the off-normal switch 8 is again opened and the synchronous motor 1 thereby stops. Since the network remains switched in, relay 4 will still hold movable contact I9 on holding contact I3.
from high When the next interruption of the circuit is effected from the transmitter, movable contact I9 will drop from holding contact I3 and engage contact 3. As the two circuit interruptions are only momentary and of extremely short duration, the synchronous motor will easily coast by during the interruption of power and continue to run. At this point, it may be stated that the subject matter of this invention is used in power circuits where the currents carried are not too heavy to render the system impractical. After this first interruption synchronous motor 1 is energized and therewith off-normal switch 8 is closed. Contact arm 2 is now turned by the synchronous motor I and will finally reach contact 9, whereby relay 4 is energized and will remain energized by the closing of the holding contact I3. Contact arm 2 is then again without potential. When the second short interruption of the network A, B is eifected on the arrival of contact arm 2 on contact I5, relay 4 is again denergized, so that movable contact I9 comes into engagement with back contact 3. On the restoration of the network potentiaLwinding I! of the tilting relay is now energized. The changeover contact arm 24 of tilting relay I8 is then brought on to contact 23. The counting mechanism of the multiple tariff meter is now changed over from low to high tariff. As soon as contact arm 2 comes into engagement with contact II, relay 4 is again energized. It then remains energized up to the next interruption of the network A, B, and contact arm 2 remains without potential. In the zero position, contact arm 2 of selector I opening of the Any accidental interruptions of network A, B after restoration of the network potential result in nothing more than idle rotation of contact arm 2. If for example, an interruption of network A, B occurs after the switching in again thereof, contact arm 2 is set in rotation. As soon, however, as it arrives on contact 9; relay 4 which was de-energized on the interruption is again energized, and thereby contact arm 2 is rendered without potential. In the sliding of the contact arm 2 on to contacts I4, I5 no energization of windings I6, I 1' of tilting relay I8 can therefore take place. It may then happen that just at this moment a further interruption of network A, B occurs of a duration which is equal to or less than the selected interruption. This is however not to be assumed, and under practical operating conditions rarely, if ever, happens.
The constructional form according to Figure 2 corresponds essentially to the arrangement according to Figure 1. In Fig.2, however, instead of the relay with an automatic holding contact,
aaoaesa whereupon the I comes on to tors A, B.
a relay with .delay a relay of this kind is employed, it is unnecessary to connect contacts 9 to I I of contact selector I to winding I2 and to a contact I3 of relay 4 (Figure 1) Insuch case it is possible to arrange the remote control system for a larger number of.remote controlled operations than when receiving devices according to Figure 1 are employed. The winding I2 of relay 4 is here connected directly across the two network conduc- On the restoration of the network'potential after interruption, movable contact I9 of relay 4 is not-immediately removed 'from contact 3, but only after atime, which insures with certainty the starting of synchronous motor 'I and closure of the off-normal switch 8. Any further description of the method of operation of the arrangement according to Figure 2 is not necessary, since the. latter corresponds essentially to that of the arrangement of Figure 1.
action is employed. when.
The invention in its broader aspects is not.
limited to the specific mechanisms shown and described but departures may be made therefrom within the scope of the accompanying claims Without departing from the principles of the invention and tages.
WhatI'claim is: '1.,A.circuit selector associated with a normally closed power supply network and responsive to the period of time elapsing between two successive momentary interruptions of the network, comprising 'a constant speed electric motor to be energized from the network, a plurality of contacts, a wiper driven by said without sacrificing its chief advan-.
motor and passing successively over said 0011- tacts, a relay, connections whereby the relay is energized from the network when the network is closed, connections from the network to the motor for initially energizing the motor and moving the wiper from initial position, said connections including the wiper, one of the selector contacts insaid initial position and a back contact of the relay, means for connecting the motor to the including the back contact of the relay, the wiper and respective other of said will accomplish selection.
2. The combination as claimed in claim 1, said means for delaying the opening of the motor connections through the back contact of the relay including a circuit established through the back contact of the relay, the wiper, another 3. The combination as claimed in claim 1, wherein the delaying of the opening of the motor connections through the back contact of the relay upon reclosure of the network to allow the motor to meanwhile move the wiper from its initial position, is accomplished by making said relay of the delay or retarded action type.
WERNER KOENIG.
contacts whereby the second momentary opening of the network
US180953A 1936-12-24 1937-12-21 Selective remote control Expired - Lifetime US2203358A (en)

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Application Number Priority Date Filing Date Title
CH191948T 1936-12-24

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US (1) US2203358A (en)
AT (1) AT156507B (en)
CH (1) CH191948A (en)
DE (1) DE672798C (en)
FR (1) FR829005A (en)
GB (1) GB494792A (en)
NL (1) NL51734C (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2598356A (en) * 1949-11-19 1952-05-27 Mcgraw Electric Co Remote switch control
US2610239A (en) * 1948-09-07 1952-09-09 Shepherd Judson O'd Traffic signal and street light control system
US2757368A (en) * 1956-07-31 System and apparatus for control of electrical circuits
US2935741A (en) * 1954-11-18 1960-05-03 John V Cebular Alarm device, system, and method
US2987703A (en) * 1957-05-09 1961-06-06 Landis & Gyr Ag Preset code receiver for central remote-control systems
US2990537A (en) * 1957-09-13 1961-06-27 Mc Graw Edison Co Remote control system
US3025496A (en) * 1956-09-27 1962-03-13 Landis & Gyr Ag Receiver for remote control impulses
US20060109653A1 (en) * 2004-11-23 2006-05-25 Takacs Laszlo A Lighting fixture with synchronizable optical filter wheel and related method

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1020088B (en) * 1952-06-12 1957-11-28 Licentia Gmbh Arrangement to prevent remote switching from being triggered by interference pulses in central remote control systems
GB1600056A (en) * 1978-03-14 1981-10-14 Texas Instruments Ltd Communication via an electricity supply main

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2757368A (en) * 1956-07-31 System and apparatus for control of electrical circuits
US2610239A (en) * 1948-09-07 1952-09-09 Shepherd Judson O'd Traffic signal and street light control system
US2598356A (en) * 1949-11-19 1952-05-27 Mcgraw Electric Co Remote switch control
US2935741A (en) * 1954-11-18 1960-05-03 John V Cebular Alarm device, system, and method
US3025496A (en) * 1956-09-27 1962-03-13 Landis & Gyr Ag Receiver for remote control impulses
US2987703A (en) * 1957-05-09 1961-06-06 Landis & Gyr Ag Preset code receiver for central remote-control systems
US2990537A (en) * 1957-09-13 1961-06-27 Mc Graw Edison Co Remote control system
US20060109653A1 (en) * 2004-11-23 2006-05-25 Takacs Laszlo A Lighting fixture with synchronizable optical filter wheel and related method
US7348742B2 (en) 2004-11-23 2008-03-25 Energy Focus, Inc. Lighting fixture with synchronizable optical filter wheel and related method

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DE672798C (en) 1939-03-10
CH191948A (en) 1937-07-15
GB494792A (en) 1938-11-01
NL51734C (en) 1942-01-15
FR829005A (en) 1938-06-08
AT156507B (en) 1939-07-10

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