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GB1414982A - Device responsive to the opening of a door - Google Patents

Device responsive to the opening of a door

Info

Publication number
GB1414982A
GB1414982A GB344572A GB344572A GB1414982A GB 1414982 A GB1414982 A GB 1414982A GB 344572 A GB344572 A GB 344572A GB 344572 A GB344572 A GB 344572A GB 1414982 A GB1414982 A GB 1414982A
Authority
GB
United Kingdom
Prior art keywords
unit
magnet
alarm
contact unit
jan
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.)
Expired
Application number
GB344572A
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.)
GRANLEY PRODUCTS LONDON Ltd
Original Assignee
GRANLEY PRODUCTS LONDON Ltd
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 GRANLEY PRODUCTS LONDON Ltd filed Critical GRANLEY PRODUCTS LONDON Ltd
Priority to GB344572A priority Critical patent/GB1414982A/en
Publication of GB1414982A publication Critical patent/GB1414982A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/08—Mechanical actuation by opening, e.g. of door, of window, of drawer, of shutter, of curtain, of blind
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
    • H01H36/0006—Permanent magnet actuating reed switches
    • H01H36/0046—Limit switches, also fail-safe operation or anti-tamper considerations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
    • H01H3/16—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. for a door switch, a limit switch, a floor-levelling switch of a lift
    • H01H3/161—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. for a door switch, a limit switch, a floor-levelling switch of a lift for actuation by moving a closing member, e.g. door, cover or lid

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

1414982 Movable magnet switches GRANLEY PRODUCTS (LONDON) Ltd 24 Jan 1973 [25 Jan 1972] 3445/72 Heading H1N A switch which is operable on movement of its permanent magnet 8 has a magnetic contact unit 2 or 3 and a magnetic shunt 4 extending from one end of the contact unit but spaced from the other end thereof. When used as part of a burglar alarm system the reed contact unit 2 is normally held closed by the magnet 8 (in the position shown dotted) and the contact unit 3 is normally open due to the flux direction of the shunt 4. The unit 2 is in series and the unit 3 shunts an alarm which operates on deenergization (Fig. 3, not shown) and as the magnet 8 moves toward the full line position shown unit 2 is opened and unit 3 is closed. If a separate magnet is brought near the assembly in an attempt to defeat the alarm the unit 3 will be operated to effect operation of the alarm.
GB344572A 1972-01-25 1972-01-25 Device responsive to the opening of a door Expired GB1414982A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB344572A GB1414982A (en) 1972-01-25 1972-01-25 Device responsive to the opening of a door

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB344572A GB1414982A (en) 1972-01-25 1972-01-25 Device responsive to the opening of a door

Publications (1)

Publication Number Publication Date
GB1414982A true GB1414982A (en) 1975-11-26

Family

ID=9758473

Family Applications (1)

Application Number Title Priority Date Filing Date
GB344572A Expired GB1414982A (en) 1972-01-25 1972-01-25 Device responsive to the opening of a door

Country Status (1)

Country Link
GB (1) GB1414982A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0364206A1 (en) * 1988-10-11 1990-04-18 Sanden Corporation Post-mix beverage dispenser unit
WO1998049702A1 (en) * 1997-04-28 1998-11-05 Jackson Research, Inc. Magnetic proximity switch system with slide-by anti-defeat mechanism
FR2907595A1 (en) * 2006-10-19 2008-04-25 Bubendorff Sa DEVICE FOR DETECTION OF THE RELATIVE POSITION OF TWO ELEMENTS WITH IMPROVED INTEGRATION

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0364206A1 (en) * 1988-10-11 1990-04-18 Sanden Corporation Post-mix beverage dispenser unit
US5086951A (en) * 1988-10-11 1992-02-11 Sanden Corporation Portable post-mix beverage dispenser unit
WO1998049702A1 (en) * 1997-04-28 1998-11-05 Jackson Research, Inc. Magnetic proximity switch system with slide-by anti-defeat mechanism
FR2907595A1 (en) * 2006-10-19 2008-04-25 Bubendorff Sa DEVICE FOR DETECTION OF THE RELATIVE POSITION OF TWO ELEMENTS WITH IMPROVED INTEGRATION
US7916019B2 (en) 2006-10-19 2011-03-29 Commissariat A L'energie Atomique, Etablissement Public A Caractere Industriel Et Commercial Device for detecting the relative position of two elements via electric circuit section having mechanical function in at least one of the elements

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Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee