GB1396874A - Magnetic alarm arrangements - Google Patents

Magnetic alarm arrangements

Info

Publication number
GB1396874A
GB1396874A GB3508471A GB3508471A GB1396874A GB 1396874 A GB1396874 A GB 1396874A GB 3508471 A GB3508471 A GB 3508471A GB 3508471 A GB3508471 A GB 3508471A GB 1396874 A GB1396874 A GB 1396874A
Authority
GB
United Kingdom
Prior art keywords
unit
contact unit
magnets
july
members
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
GB3508471A
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.)
EMI Ltd
Original Assignee
EMI 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 EMI Ltd filed Critical EMI Ltd
Priority to GB3508471A priority Critical patent/GB1396874A/en
Priority to ZA725108A priority patent/ZA725108B/en
Priority to DE2237308A priority patent/DE2237308A1/en
Publication of GB1396874A publication Critical patent/GB1396874A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)

Abstract

1396874 Magnetic switches EMI Ltd 19 July 1972 [27 July 1971] 35084/71 Heading H1N An alarm switch for operation on relative movement of two members 1, 4 has a reed contact unit 3 responsive to the magnetic field of two oppositely poled flux sources 5, 6 movable relative to the unit 3 along the line between the poles of the members 1, 4 and a further magnetic member 9 is provided with an aperture allowing flux from the magnets to reach the contact unit. The member 9 may surround the magnets or may be a permanent magnet which biases the contacts of the unit 3. The reeds may be normal or parallel (Fig. 5, not shown) to the path of movement and the contact unit may have a resistor connected between its terminals.
GB3508471A 1971-07-27 1971-07-27 Magnetic alarm arrangements Expired GB1396874A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB3508471A GB1396874A (en) 1971-07-27 1971-07-27 Magnetic alarm arrangements
ZA725108A ZA725108B (en) 1971-07-27 1972-07-24 Improvements in or relating to arrangements including means responsive to magnetic flux
DE2237308A DE2237308A1 (en) 1971-07-27 1972-07-26 ALARM

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3508471A GB1396874A (en) 1971-07-27 1971-07-27 Magnetic alarm arrangements

Publications (1)

Publication Number Publication Date
GB1396874A true GB1396874A (en) 1975-06-11

Family

ID=10373612

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3508471A Expired GB1396874A (en) 1971-07-27 1971-07-27 Magnetic alarm arrangements

Country Status (3)

Country Link
DE (1) DE2237308A1 (en)
GB (1) GB1396874A (en)
ZA (1) ZA725108B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0021611A1 (en) * 1979-06-08 1981-01-07 GKN Fasteners Limited Security system sensor
GB2238664A (en) * 1989-12-02 1991-06-05 Powered Showers Plc Flow switch assembly
WO1998049702A1 (en) * 1997-04-28 1998-11-05 Jackson Research, Inc. Magnetic proximity switch system with slide-by anti-defeat mechanism
ITPI20080061A1 (en) * 2008-07-15 2010-01-16 Alessandro Colella IMPROVEMENT OF A FRAME / FRAME STRUCTURE PREPARED FOR INSTALLATION OF CONTROL SENSORS

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3409649C1 (en) * 1984-03-16 1985-11-07 Heinrich 3550 Marburg Sälzer Device for displaying the movement and / or position of a shut-off device
DE3632367C1 (en) * 1986-09-24 1988-02-18 Heinrich Saelzer Device for remote monitoring of the position and / or movement of a shut-off device
DE8701282U1 (en) * 1987-01-27 1987-05-07 Unirollka-Baufertigteile GmbH, 6927 Bad Rappenau Security window/door
DE19609363A1 (en) * 1996-03-04 1997-09-11 Helmut Fiedler Wireless alarm system for monitoring rooms or houses

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0021611A1 (en) * 1979-06-08 1981-01-07 GKN Fasteners Limited Security system sensor
GB2238664A (en) * 1989-12-02 1991-06-05 Powered Showers Plc Flow switch assembly
GB2238664B (en) * 1989-12-02 1994-06-22 Powered Showers Plc Flow switch assembly
WO1998049702A1 (en) * 1997-04-28 1998-11-05 Jackson Research, Inc. Magnetic proximity switch system with slide-by anti-defeat mechanism
ITPI20080061A1 (en) * 2008-07-15 2010-01-16 Alessandro Colella IMPROVEMENT OF A FRAME / FRAME STRUCTURE PREPARED FOR INSTALLATION OF CONTROL SENSORS

Also Published As

Publication number Publication date
ZA725108B (en) 1973-04-25
DE2237308A1 (en) 1973-02-08

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Legal Events

Date Code Title Description
PS Patent sealed
435 Patent endorsed 'licences of right' on the date specified (sect. 35/1949)
PCNP Patent ceased through non-payment of renewal fee