US481989A - Electric fire and burglar alarm connection - Google Patents

Electric fire and burglar alarm connection Download PDF

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Publication number
US481989A
US481989A US481989DA US481989A US 481989 A US481989 A US 481989A US 481989D A US481989D A US 481989DA US 481989 A US481989 A US 481989A
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US
United States
Prior art keywords
burglar alarm
electric fire
alarm connection
connection
fire
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Expired - Lifetime
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Publication of US481989A publication Critical patent/US481989A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
    • H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
    • H01H37/764—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material in which contacts are held closed by a thermal pellet
    • H01H37/765—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material in which contacts are held closed by a thermal pellet using a sliding contact between a metallic cylindrical housing and a central electrode

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Fire Alarms (AREA)
  • Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)

Description

(No Model.)
. T WILSON.
EL0TBG PIRE AND BUEGLAR LARM 00NNECTION. N0. 48l,989 Patented Se t. 6, 1892'
US481989D Electric fire and burglar alarm connection Expired - Lifetime US481989A (en)

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Publication Number Publication Date
US481989A true US481989A (en) 1892-09-06

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US481989D Expired - Lifetime US481989A (en) Electric fire and burglar alarm connection

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3995246A (en) * 1975-02-04 1976-11-30 Morgan John M Device for controlling the temperature and protecting against excessive flow of current of electric installations

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3995246A (en) * 1975-02-04 1976-11-30 Morgan John M Device for controlling the temperature and protecting against excessive flow of current of electric installations

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