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DE102006033708A1 - Door drive with device for emergency use consisting of electro-engine and gearing connected to emergency device using emergency current device - Google Patents

Door drive with device for emergency use consisting of electro-engine and gearing connected to emergency device using emergency current device Download PDF

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Publication number
DE102006033708A1
DE102006033708A1 DE102006033708A DE102006033708A DE102006033708A1 DE 102006033708 A1 DE102006033708 A1 DE 102006033708A1 DE 102006033708 A DE102006033708 A DE 102006033708A DE 102006033708 A DE102006033708 A DE 102006033708A DE 102006033708 A1 DE102006033708 A1 DE 102006033708A1
Authority
DE
Germany
Prior art keywords
emergency
door drive
engine
low voltage
electro
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
DE102006033708A
Other languages
German (de)
Inventor
Hans-Joachim Dipl.-Ing. Molterer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mfz Antriebe & Co KG GmbH
Original Assignee
Mfz Antriebe & Co KG GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE202006001834U external-priority patent/DE202006001834U1/en
Application filed by Mfz Antriebe & Co KG GmbH filed Critical Mfz Antriebe & Co KG GmbH
Priority to DE102006033708A priority Critical patent/DE102006033708A1/en
Publication of DE102006033708A1 publication Critical patent/DE102006033708A1/en
Ceased legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F15/00—Power-operated mechanisms for wings
    • E05F15/60—Power-operated mechanisms for wings using electrical actuators
    • E05F15/603—Power-operated mechanisms for wings using electrical actuators using rotary electromotors
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F15/00—Power-operated mechanisms for wings
    • E05F15/70—Power-operated mechanisms for wings with automatic actuation
    • E05F15/72—Power-operated mechanisms for wings with automatic actuation responsive to emergency conditions, e.g. fire
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2201/00—Constructional elements; Accessories therefor
    • E05Y2201/40—Motors; Magnets; Springs; Weights; Accessories therefor
    • E05Y2201/404—Function thereof
    • E05Y2201/41—Function thereof for closing
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2201/00—Constructional elements; Accessories therefor
    • E05Y2201/40—Motors; Magnets; Springs; Weights; Accessories therefor
    • E05Y2201/404—Function thereof
    • E05Y2201/422—Function thereof for opening
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2201/00—Constructional elements; Accessories therefor
    • E05Y2201/40—Motors; Magnets; Springs; Weights; Accessories therefor
    • E05Y2201/43—Motors
    • E05Y2201/434—Electromotors; Details thereof
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2400/00—Electronic control; Electrical power; Power supply; Power or signal transmission; User interfaces
    • E05Y2400/61—Power supply
    • E05Y2400/612—Batteries
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2800/00—Details, accessories and auxiliary operations not otherwise provided for
    • E05Y2800/20—Combinations of elements
    • E05Y2800/21—Combinations of elements of identical elements, e.g. of identical compression springs
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2800/00—Details, accessories and auxiliary operations not otherwise provided for
    • E05Y2800/20—Combinations of elements
    • E05Y2800/22—Combinations of elements of not identical elements of the same category, e.g. combinations of not identical springs
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2800/00—Details, accessories and auxiliary operations not otherwise provided for
    • E05Y2800/20—Combinations of elements
    • E05Y2800/242—Combinations of elements arranged in parallel relationship
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2800/00—Details, accessories and auxiliary operations not otherwise provided for
    • E05Y2800/20—Combinations of elements
    • E05Y2800/244—Combinations of elements arranged in serial relationship
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2800/00—Details, accessories and auxiliary operations not otherwise provided for
    • E05Y2800/20—Combinations of elements
    • E05Y2800/246—Combinations of elements with at least one element being redundant

Landscapes

  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Power-Operated Mechanisms For Wings (AREA)

Abstract

Door drive consists of electro engine and gearing, with emergency drive device which can be connected to it using an emergency current device. Emergency drive device consists of extra-low voltage engine, coupling and switch device to switch off the electro-engine intended for normal drive and to connect and switch on the extra-low voltage engine. In addition, the extra-low voltage engine has gearing to create a rotational speed slower than normal. An emergency current accumulator is present which can supply the coupling and the extra-low voltage engine by a simple switch connection.

Description

Die Erfindung betrifft einen Torantrieb mit Notbedieneinrichtung bestehend aus einem Elektromotor und einem Getriebe.The Invention relates to a door drive with emergency operation consisting from an electric motor and a gearbox.

Torantriebe mit Notbedieneinrichtungen sind beispielsweise als Feuerschutztorantriebe bekannt. Derartige Feuerschutztorantriebe sind mit Einrichtungen ausgerüstet, die im Brandfall auch ohne Energiezufuhr ein Schließen des Brandschutztores sicher herbeiführen.Torantriebe with emergency operating devices are, for example, as Feuerschutztorantriebe known. Such fire protection door drives are equipped with facilities equipped, in case of fire, even without power supply closing the Safely bring in fire doors.

Üblicherweise sind Torantriebe, die beispielsweise für Sektionaltore, Rolltore, Rollgitter oder Rollläden oder beliebige andere Tore einsetzbar sind mit einer Einrichtung ausgestattet, um vom automatischen Kraftbetrieb auf Handbetrieb umzustellen. Der Handbetrieb ist also ein Notbetrieb des Tores. Eine derartige Notbedienung des Tores kann dann erforderlich werden, wenn ein Netzspannungsausfall auftritt.Usually are door drives, which are used, for example, for sectional doors, roller shutters, Roller grills or shutters or any other goals can be used with a device equipped to switch from automatic power to manual convert. Manual operation is thus an emergency operation of the gate. Such emergency operation of the gate may then become necessary if a mains voltage failure occurs.

Tore für besondere Anwendungen, wie die beispielsweise zuvor genannten Feuerschutztore, sind ebenfalls mit einer Notbetriebseinrichtung ausgestattet. Hierbei sorgt im Notbetrieb eine Einrichtung dafür, dass auch bei Ausfall der Energieversorgung das Tor sicher schließt und damit den Brandabschnitt sichert.Gates for special Applications, such as the aforementioned fire doors, are also equipped with an emergency operation device. This ensures in emergency mode, a device that even in case of failure Energy supply the gate closes safely and thus the fire section guaranteed.

Andere Tore, beispielsweise in Rettungswegen, können auch für einen besonderen Notbetrieb ausgerüstet sein. Besondere Einrichtungen sorgen dafür, dass sich in einer definierten Notsituation der Fluchtweg öffnet oder offen gehalten wird.Other Gates, for example in escape routes, can also be equipped for a special emergency operation. Special facilities ensure that in a defined Emergency situation the escape route opens or kept open.

Bei den vorgenannten Torantrieben wird grundsätzlich zwischen einer Normalbetriebssituation und einer Notbetriebssituation unterschieden. In der Notbetriebssituation realisieren besondere Einrichtungen die Aktivität des Antriebs unabhängig von dem für den Normalbetrieb eingesetzten, durch Netzspannung betriebenen Motoren.at the aforementioned door drives is basically between a normal operating situation and an emergency operation situation. In the emergency operating situation special facilities realize the activity of the drive independently of that for the Normal operation used, powered by mains voltage motors.

Es sind Notbetriebseinrichtungen denkbar, die bei Netzspannungsausfall durch ein Notstromaggregat die normale Netzspannung als Energieversorgung aufrechterhalten. Diese Systeme haben aber den Nachteil, dass eine fehlerfreie Bereitstellung der Energieversorgung nur mit erheblichen Kosten ermöglicht werden kann.It Emergency operation devices are conceivable, which in case of mains voltage failure by an emergency generator the normal mains voltage as energy supply maintained. But these systems have the disadvantage that a error-free provision of the power supply only with considerable Costs possible can be.

Aufgabe der vorliegenden Erfindung ist es daher, einen einfachen Torantrieb an die Hand zu geben, mit dem ein Notbetrieb bei Ausfall der Energiezufuhr eines Antriebes und/oder bei Eintreten einer Brand- oder Fluchtsituation durchgeführt werden kann.task The present invention is therefore a simple door operator to give to the hand, with an emergency operation in case of power failure a drive and / or in the event of a fire or emergency situation carried out can be.

Erfindungsgemäß wird diese Aufgabe durch einen Torantrieb nach Anspruch 1 gelöst. Demnach wird ein Torantrieb mit Notbedieneinrichtung bestehend aus einem Elektromotor und einem Getriebe geschaffen, bei dem eine Notbetriebseinrichtung aktiv über eine Notstromeinrichtung einkuppelbar ist.According to the invention this Problem solved by a door drive according to claim 1. Accordingly, will a door drive with emergency operation consisting of an electric motor and a transmission provided in which an emergency operation device actively over an emergency power device can be coupled.

Bevorzugte Ausgestaltungen der Erfindung ergeben sich aus den sich an den Hauptanspruch anschließenden Unteransprüchen.preferred Embodiments of the invention will become apparent from the main claim subsequent Dependent claims.

Demnach kann die Notbetriebseinrichtung aus einem Kleinspannungsmotor, einer Kupplung und einer Schalteinrichtung zur Abschaltung des für den Normalbetrieb vorgesehenen Elektromotors und zur Einkupplung und Einschaltung des Kleinspannungsmotors bestehen.Therefore can the emergency operation device from a low voltage motor, a Clutch and a switching device for switching off the normal operation provided electric motor and for coupling and engagement consist of low voltage motor.

Weiterhin kann am Kleinspannungsmotor zusätzlich ein Getriebe zur Erzeugung einer gegenüber dem Normalbetrieb reduzierten Drehzahl angeordnet sein.Farther can in addition to the extra-low voltage motor a transmission for generating a reduced compared to the normal operation Be arranged speed.

Schließlich ist vorteilhaft ein Notstromakkumulator vorhanden, der die Kupplung und den Kleinspannungsmotor durch eine einfache Schaltungsverknüpfung versorgen kann.Finally is advantageous an emergency power accumulator present, the clutch and provide the low voltage motor through a simple circuit connection can.

Weitere Merkmale, Einzelheiten und Vorteile der Erfindung ergeben sich aus einem in der Zeichnung dargestellten Ausführungsbeispiel. Es zeigen:Further Features, details and advantages of the invention will become apparent an embodiment shown in the drawing. Show it:

1: eine Seitenansicht eines Ausführungsbeispiels des erfindungsgemäßen Torantriebs und 1 : A side view of an embodiment of the door drive according to the invention and

2: eine Draufsicht auf den erfindungsgemäßen Torantrieb gemäß 1. 2 : A plan view of the door drive according to the invention 1 ,

In den 1 und 2 ist ein Feuerschutztorantrieb 10 dargestellt. Dieser weist ein Getriebe 12 auf, welches über eine Befestigungsschiene 14 an einem gewünschten Ort montierbar ist. An dem Getriebe ist ein Elektromotor 16 montiert. Unterhalb des Elektromotors 16 befindet sich ein elektrischer Anschlußkasten 18 mit Einrichtungen für die Endabschaltung des Torantriebs.In the 1 and 2 is a fire door drive 10 shown. This has a gearbox 12 on which via a mounting rail 14 can be mounted in a desired location. At the transmission is an electric motor 16 assembled. Below the electric motor 16 there is an electrical connection box 18 with devices for the final shutdown of the door drive.

Angeflanscht an dem Elektromotor 16 ist eine elektromechanische Kupplungsvorrichtung 20, an welcher wiederum ein Getriebe 22 mit angeflanschtem Kleinspannungsmotor als Gleichstrommotor anschließt.Flanged to the electric motor 16 is an electromechanical coupling device 20 , on which in turn a transmission 22 connected with flanged low-voltage motor as a DC motor.

Der Torantrieb wird im Normalbetrieb durch den Elektromotor 16, welcher in der Regel mit Wechselstrom oder Drehstrom versorgt wird, bewegt.The door drive is in normal operation by the electric motor 16 , which is usually supplied with alternating current or three-phase current, moves.

Im Notbetrieb, das heißt bei Ausfall der Energieversorgung und/oder dem Eintreten einer besonderen Situation, wird der für den Normalbetrieb vorhandene Elektromotor 16 abgeschaltet. Die Notbetriebseinrichtung, bestehend aus Kupplung 20, Getriebe 22 und Kleinspannungsmotor 24 werden nun mit dem Getriebe 12 verbunden und in Gang gebracht.In emergency mode, that is in case of failure of the power supply and / or the occurrence of a special their situation, is the existing for normal operation electric motor 16 off. The emergency operation device, consisting of coupling 20 , Transmission 22 and low voltage motor 24 be with the gearbox now 12 connected and started up.

Die Kupplung und der Elektromotor werden durch eine einfache Schaltungsverknüpfung von einem Notstrom-Akkumulator versorgt.The Clutch and the electric motor are characterized by a simple circuit connection of powered by an emergency power accumulator.

Die Verwendung des Untersetzungsgetriebes 22 in Verbindung mit dem Kleinspannungsmotor 24 ist von Vorteil, da hier für den Normalbetrieb eine besonders reduzierte Drehzahl erreicht wird. Dies sorgt für eine im Notbetrieb besonders reduzierte Torlaufgeschwindigkeit gegenüber der Geschwindigkeit im Normalbetrieb. Beim Notbetrieb wird dadurch eine bewußt reduzierte Laufgeschwindigkeit des Torblatts erreicht. Mit der damit verbundenen übersichtlichten Torblattbewegung.The use of the reduction gear 22 in conjunction with the extra-low voltage motor 24 is advantageous, since a particularly reduced speed is achieved here for normal operation. This ensures a particularly reduced door speed in emergency operation compared to the speed in normal operation. During emergency operation, a deliberately reduced running speed of the door leaf is thereby achieved. With the associated transparent door leaf movement.

Claims (4)

Torantrieb mit Notbedieneinrichtung bestehend aus einem Elektromotor und einem Getriebe, dadurch gekennzeichnet, daß eine Notbetriebseinrichtung aktiv über eine Notstromeinrichtung einkuppelbar ist.Door drive with emergency operating device consisting of an electric motor and a transmission, characterized in that an emergency operation device can be actively engaged via an emergency power device. Torantrieb nach Anspruch 1, dadurch gekennzeichnet, daß die Notbetriebseinrichtung aus einem Kleinspannungsmotor, einer Kupplung und einer Schalteinrichtung zur Abschaltung des für den Normalbetrieb vorgesehenen Elektromotors und zur Einkupplung und Einschaltung des Kleinspannungsmotors besteht.Door drive according to claim 1, characterized in that that the Emergency operation device from a low-voltage motor, a clutch and a switching device for switching off the normal operation provided electric motor and for coupling and engagement consists of the low voltage motor. Torantrieb nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß am Kleinspannungsmotor zusätzlich ein Getriebe zur Erzeugung einer gegenüber dem Normalbetrieb reduzierten Drehzahl angeordnet ist.Door drive according to claim 1 or 2, characterized that am Extra-low voltage motor in addition a transmission for generating a reduced compared to the normal operation Speed is arranged. Torantrieb nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß zusätzlich ein Notstromakkumulator vorhanden ist, der die Kupplung und den Kleinspannungsmotor durch eine einfache Schaltungsverknüpfung versorgen kann.Door drive according to one of claims 1 to 3, characterized that in addition a Emergency power accumulator is present, the clutch and the low voltage motor can provide by a simple circuit connection.
DE102006033708A 2006-02-06 2006-07-20 Door drive with device for emergency use consisting of electro-engine and gearing connected to emergency device using emergency current device Ceased DE102006033708A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE102006033708A DE102006033708A1 (en) 2006-02-06 2006-07-20 Door drive with device for emergency use consisting of electro-engine and gearing connected to emergency device using emergency current device

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE202006001834.4 2006-02-06
DE202006001834U DE202006001834U1 (en) 2006-02-06 2006-02-06 Door drive with emergency operating device
DE102006033708A DE102006033708A1 (en) 2006-02-06 2006-07-20 Door drive with device for emergency use consisting of electro-engine and gearing connected to emergency device using emergency current device

Publications (1)

Publication Number Publication Date
DE102006033708A1 true DE102006033708A1 (en) 2007-08-23

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Family Applications (1)

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DE102006033708A Ceased DE102006033708A1 (en) 2006-02-06 2006-07-20 Door drive with device for emergency use consisting of electro-engine and gearing connected to emergency device using emergency current device

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DE (1) DE102006033708A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016225078A1 (en) * 2016-12-15 2018-06-21 Gabrijel Rejc Gmbh & Co. Kg Gate with an emergency opening device
US10829989B2 (en) 2016-06-28 2020-11-10 Gabrijel Rejc Motor-operable and vertically movable gate
US10914117B2 (en) 2016-06-28 2021-02-09 Gabrijel Rejc Vertically movable gate with a gate panel
US11499369B2 (en) 2016-12-15 2022-11-15 Gabrijel Rejc Gmbh & Co. Kg Gate with a crash-down prevention mechanism and method for triggering the crash-down prevention mechanism

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10829989B2 (en) 2016-06-28 2020-11-10 Gabrijel Rejc Motor-operable and vertically movable gate
US10914117B2 (en) 2016-06-28 2021-02-09 Gabrijel Rejc Vertically movable gate with a gate panel
DE102016225078A1 (en) * 2016-12-15 2018-06-21 Gabrijel Rejc Gmbh & Co. Kg Gate with an emergency opening device
US11499369B2 (en) 2016-12-15 2022-11-15 Gabrijel Rejc Gmbh & Co. Kg Gate with a crash-down prevention mechanism and method for triggering the crash-down prevention mechanism

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