NL7802433A - Fire door automatic locking mechanism - has time controlled electromagnetic circuit holding doors open during working hours - Google Patents

Fire door automatic locking mechanism - has time controlled electromagnetic circuit holding doors open during working hours

Info

Publication number
NL7802433A
NL7802433A NL7802433A NL7802433A NL7802433A NL 7802433 A NL7802433 A NL 7802433A NL 7802433 A NL7802433 A NL 7802433A NL 7802433 A NL7802433 A NL 7802433A NL 7802433 A NL7802433 A NL 7802433A
Authority
NL
Netherlands
Prior art keywords
locking mechanism
automatic locking
during working
working hours
open during
Prior art date
Application number
NL7802433A
Other languages
Dutch (nl)
Original Assignee
Handelmaatschappij Brinkman En
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
Application filed by Handelmaatschappij Brinkman En filed Critical Handelmaatschappij Brinkman En
Priority to NL7802433A priority Critical patent/NL7802433A/en
Publication of NL7802433A publication Critical patent/NL7802433A/en

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05C—BOLTS OR FASTENING DEVICES FOR WINGS, SPECIALLY FOR DOORS OR WINDOWS
    • E05C17/00—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith
    • E05C17/56—Devices for holding wings open; Devices for limiting opening of wings or for holding wings open by a movable member extending between frame and wing; Braking devices, stops or buffers, combined therewith by magnetic or electromagnetic attraction or operated by electric or electromagnetic means

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power-Operated Mechanisms For Wings (AREA)

Abstract

The automatic locking mechanism comprises an electromagnet with open magnetic circuit, working with a moving armature, together with a d.c. energising circuit for the magnet, and which can be cut off. It is partic. for holding fire doors in buildings open during working hours. It has a measuring circuit for the self-induction of the electromagnet, which is higher when the armature is pulled than when it is released. This controls a timing circuit, cutting off the energising current through the electromagnet when a predetermined time has elapsed after self-induction has reached the higher value occurring when the armature is pulled.
NL7802433A 1978-03-06 1978-03-06 Fire door automatic locking mechanism - has time controlled electromagnetic circuit holding doors open during working hours NL7802433A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL7802433A NL7802433A (en) 1978-03-06 1978-03-06 Fire door automatic locking mechanism - has time controlled electromagnetic circuit holding doors open during working hours

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7802433A NL7802433A (en) 1978-03-06 1978-03-06 Fire door automatic locking mechanism - has time controlled electromagnetic circuit holding doors open during working hours

Publications (1)

Publication Number Publication Date
NL7802433A true NL7802433A (en) 1979-09-10

Family

ID=19830445

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7802433A NL7802433A (en) 1978-03-06 1978-03-06 Fire door automatic locking mechanism - has time controlled electromagnetic circuit holding doors open during working hours

Country Status (1)

Country Link
NL (1) NL7802433A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4401346A (en) * 1981-03-19 1983-08-30 Aircraft Dynamics Corporation Apparatus for controlling the operation of a door
US4440428A (en) * 1981-09-01 1984-04-03 Jessup Frank L Apparatus for delaying the closing of a door
WO2015180769A1 (en) * 2014-05-28 2015-12-03 Abb Technology Ltd A device and a method for controlling a magnetic door holder, and a magnetic door holder

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4401346A (en) * 1981-03-19 1983-08-30 Aircraft Dynamics Corporation Apparatus for controlling the operation of a door
US4440428A (en) * 1981-09-01 1984-04-03 Jessup Frank L Apparatus for delaying the closing of a door
WO2015180769A1 (en) * 2014-05-28 2015-12-03 Abb Technology Ltd A device and a method for controlling a magnetic door holder, and a magnetic door holder

Similar Documents

Publication Publication Date Title
ES8308149A1 (en) Mechanically operated switch with automatic opening.
US3492037A (en) Magnetic touch latch
US2888290A (en) Door with magnetic catch
EP0916814A3 (en) Apparatus and method of controlling electromagnetic valve
WO1989010510A3 (en) Pulsed hydraulic valve
GB2105132A (en) Electronic device for the energization of an electromagnetic element
NL7802433A (en) Fire door automatic locking mechanism - has time controlled electromagnetic circuit holding doors open during working hours
GB1066100A (en) Electromagnetic brakes and clutches
JPS5714832A (en) Camera provided with data imprinting device
JPS5497003A (en) Method of and device for optimizing tape energization for magnetic tape device
JPS56160736A (en) Electromagnetic relay with pivotal armature with permanent magnet
ES8305525A1 (en) Multi-chopping drive circuit for an electromagnetic print hammer or the like.
DE3564841D1 (en) Electric lock with a particularly shaped keeper, especially for the entrance doors of secured rooms
ES8607506A1 (en) Automatically controllable valve device.
FR2387405A1 (en) Electrically operated valve for vehicle gas heater - has mechanical safety latch withdrawable for preventing accidental movement of armature of electromagnet
DE3778298D1 (en) METHOD AND DEVICE FOR CONTROLLING AN ELECTROMAGNET, WHOSE EXCITATION BY A HALF-WAVE CURRENT CAUSES THE OPERATION OF A MOVABLE PIECE.
GB1296484A (en)
JPS51140344A (en) Method and apparatus for automatically closing anti-smoke fire door
FR2309031A1 (en) AC electric circuit breaker - has electromagnet with solid rectangular cross-section core and armature connected to rod and rocker to actuate contacts
JPS57144364A (en) Opening and closing device for gas valve closed automatically
JPS5713714A (en) Driving device for electromagnet
JPS5664683A (en) Electronic time piece having alarm
FR2360982A2 (en) Sensitive electromagnetic relay with two iron cores - has permanent magnet between cores and has control coil forming flat structure
GB1490696A (en) Electromagnetic relays
JPS6439010A (en) Electromagnetic locking device

Legal Events

Date Code Title Description
BV The patent application has lapsed