FR2259405A1 - Pres-stressed glass alarm disc - in which fragmentation of the glass breaks a conductor and activates an alarm circuit - Google Patents

Pres-stressed glass alarm disc - in which fragmentation of the glass breaks a conductor and activates an alarm circuit

Info

Publication number
FR2259405A1
FR2259405A1 FR7502877A FR7502877A FR2259405A1 FR 2259405 A1 FR2259405 A1 FR 2259405A1 FR 7502877 A FR7502877 A FR 7502877A FR 7502877 A FR7502877 A FR 7502877A FR 2259405 A1 FR2259405 A1 FR 2259405A1
Authority
FR
France
Prior art keywords
disc
glass
alarm
stressed
pres
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.)
Granted
Application number
FR7502877A
Other languages
French (fr)
Other versions
FR2259405B1 (en
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.)
Saint Gobain Industries SA
Compagnie de Saint Gobain SA
Original Assignee
Saint Gobain Industries SA
Compagnie de Saint Gobain SA
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 Saint Gobain Industries SA, Compagnie de Saint Gobain SA filed Critical Saint Gobain Industries SA
Publication of FR2259405A1 publication Critical patent/FR2259405A1/en
Application granted granted Critical
Publication of FR2259405B1 publication Critical patent/FR2259405B1/fr
Granted legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10082—Properties of the bulk of a glass sheet
    • B32B17/10091—Properties of the bulk of a glass sheet thermally hardened
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10036—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets
    • B32B17/10045—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets with at least one intermediate layer consisting of a glass sheet
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/04—Mechanical actuation by breaking of glass

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Joining Of Glass To Other Materials (AREA)
  • Packaging For Recording Disks (AREA)

Abstract

In a glass alarm disc of the known type in which can electrical conductor connected to a circuit is mounted on a prestressed glass disc and is broken when the disc is damaged so that an alarm or protective device is operated, the improvement whereby at least a part of the electrical conductor is situated in a corner region of the glass disc, the edges or sides of the visible surface of this region being firmly attached to the frame enclosing the glass disc or to some other object. Ensures that on fracture of the disc - which since it is pre-stressed breaks into a large number of small pieces - the electrical conductor is broken, which in earlier devices was not always the case when the disc was mounted in a frame. The principle can also be applied in modified form for the case where the pre-stressed glass disc is laminated to one or more additional glass discs.
FR7502877A 1974-01-30 1975-01-30 Pres-stressed glass alarm disc - in which fragmentation of the glass breaks a conductor and activates an alarm circuit Granted FR2259405A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19742404278 DE2404278C2 (en) 1974-01-30 1974-01-30 Alarm glass pane

Publications (2)

Publication Number Publication Date
FR2259405A1 true FR2259405A1 (en) 1975-08-22
FR2259405B1 FR2259405B1 (en) 1979-10-12

Family

ID=5906019

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7502877A Granted FR2259405A1 (en) 1974-01-30 1975-01-30 Pres-stressed glass alarm disc - in which fragmentation of the glass breaks a conductor and activates an alarm circuit

Country Status (4)

Country Link
BE (1) BE824998A (en)
DE (1) DE2404278C2 (en)
FR (1) FR2259405A1 (en)
IT (1) IT1027417B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3003683A1 (en) * 1980-02-01 1981-08-06 Vereinigte Glaswerke Gmbh, 5100 Aachen MULTI-LAYER ALARM GLASS
DE3105564A1 (en) * 1981-02-16 1982-09-09 Vereinigte Glaswerke Gmbh, 5100 Aachen ALARM GLASS PANEL AND METHOD FOR THEIR PRODUCTION
DE19754295C2 (en) * 1997-12-08 2002-12-12 Claus Baumann Process for the detection of damage to a glass pane

Also Published As

Publication number Publication date
IT1027417B (en) 1978-11-20
FR2259405B1 (en) 1979-10-12
DE2404278B1 (en) 1975-03-13
DE2404278C2 (en) 1975-10-23
BE824998A (en) 1975-07-30

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Legal Events

Date Code Title Description
ST Notification of lapse