BR7700764A - Chave ativada por forca magnetica e alarme contra ladroes que contem a mesma - Google Patents

Chave ativada por forca magnetica e alarme contra ladroes que contem a mesma

Info

Publication number
BR7700764A
BR7700764A BR7700764A BR7700764A BR7700764A BR 7700764 A BR7700764 A BR 7700764A BR 7700764 A BR7700764 A BR 7700764A BR 7700764 A BR7700764 A BR 7700764A BR 7700764 A BR7700764 A BR 7700764A
Authority
BR
Brazil
Prior art keywords
stamps
contain
same
magnetic strength
key activated
Prior art date
Application number
BR7700764A
Other languages
English (en)
Portuguese (pt)
Inventor
N Cohen
Original Assignee
N Cohen
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 N Cohen filed Critical N Cohen
Publication of BR7700764A publication Critical patent/BR7700764A/pt

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/14—Switches operated by change of acceleration, e.g. by shock or vibration, inertia switch
    • H01H35/144—Switches operated by change of acceleration, e.g. by shock or vibration, inertia switch operated by vibration
    • 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
BR7700764A 1976-02-09 1977-02-08 Chave ativada por forca magnetica e alarme contra ladroes que contem a mesma BR7700764A (pt)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/656,098 US4057773A (en) 1976-02-09 1976-02-09 Magnetic switch

Publications (1)

Publication Number Publication Date
BR7700764A true BR7700764A (pt) 1977-10-11

Family

ID=24631613

Family Applications (1)

Application Number Title Priority Date Filing Date
BR7700764A BR7700764A (pt) 1976-02-09 1977-02-08 Chave ativada por forca magnetica e alarme contra ladroes que contem a mesma

Country Status (12)

Country Link
US (1) US4057773A (US20080094685A1-20080424-C00004.png)
JP (1) JPS5297171A (US20080094685A1-20080424-C00004.png)
BR (1) BR7700764A (US20080094685A1-20080424-C00004.png)
CA (1) CA1083206A (US20080094685A1-20080424-C00004.png)
CH (1) CH613806A5 (US20080094685A1-20080424-C00004.png)
DE (1) DE2705065A1 (US20080094685A1-20080424-C00004.png)
FR (1) FR2340609A1 (US20080094685A1-20080424-C00004.png)
GB (1) GB1577782A (US20080094685A1-20080424-C00004.png)
IT (1) IT1077809B (US20080094685A1-20080424-C00004.png)
MX (1) MX142994A (US20080094685A1-20080424-C00004.png)
NL (1) NL7701300A (US20080094685A1-20080424-C00004.png)
SE (1) SE7701318L (US20080094685A1-20080424-C00004.png)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4258358A (en) * 1978-08-16 1981-03-24 International Quartz Ltd. Door opening sensing and alarm producing device
US4531029A (en) * 1982-01-08 1985-07-23 Currillies Trimble Cricket switch
US4513271A (en) * 1982-07-16 1985-04-23 Minnesota Mining And Manufacturing Company Momentary contact magnetic switch
US4553134A (en) * 1982-12-23 1985-11-12 Alarm Accessory Ltd. Electrical alarm system for installation in a window casing
CA1245104A (en) * 1988-02-18 1988-11-22 Harry K. Rehberg Door alarm
US4837557A (en) * 1988-03-04 1989-06-06 Raywheel, Inc. Combination alarm and lock device with sensitivity adjustment
GB2226701A (en) * 1988-12-30 1990-07-04 She William Yung Lee Electrical switch
US5530428A (en) * 1993-04-06 1996-06-25 Woods; Randall Security alarm switch
US5554833A (en) * 1994-09-26 1996-09-10 Johnson; Wayne Magnetic switch tripping system
US5929731A (en) * 1996-05-08 1999-07-27 Jackson Research, Inc. Balanced magnetic proximity switch assembly
US5877664A (en) * 1996-05-08 1999-03-02 Jackson, Jr.; John T. Magnetic proximity switch system
US5673021A (en) * 1996-05-22 1997-09-30 Woods; Randall Magnetic switch assembly for detecting unauthorized opening of doors or windows
US5880659A (en) * 1997-03-17 1999-03-09 Woods; Randell Magnetic switch assembly for detecting unauthorized opening of doors or windows
US5977873A (en) * 1998-03-04 1999-11-02 Woods; Randall Alarm switch
US6087936A (en) * 1998-12-29 2000-07-11 Woods; Randall Vibration sensor
WO2023141187A1 (en) * 2022-01-19 2023-07-27 Baker Hughes Oilfield Operations Llc Magnetic switch arrangement

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH240703A (de) * 1943-11-30 1946-01-15 Auderset Pierre Vorrichtung zum Anzeigen von Druckverlusten in Luftreifen.
US3281735A (en) * 1965-04-14 1966-10-25 Blumish Thomas Magnetic switch having swingably supported permanent magnet actuating means
US3539741A (en) * 1969-08-08 1970-11-10 Mallory & Co Inc P R Magnetically activated door switch
US3806852A (en) * 1972-10-02 1974-04-23 Stanley Works Switch activating hinge

Also Published As

Publication number Publication date
NL7701300A (nl) 1977-08-11
IT1077809B (it) 1985-05-04
MX142994A (es) 1981-02-03
FR2340609A1 (fr) 1977-09-02
JPS5297171A (en) 1977-08-15
SE7701318L (sv) 1977-08-10
US4057773A (en) 1977-11-08
CH613806A5 (US20080094685A1-20080424-C00004.png) 1979-10-15
GB1577782A (en) 1980-10-29
CA1083206A (en) 1980-08-05
DE2705065A1 (de) 1977-10-06
FR2340609B3 (US20080094685A1-20080424-C00004.png) 1979-10-05

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