US481989A - Electric fire and burglar alarm connection - Google Patents
Electric fire and burglar alarm connection Download PDFInfo
- 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
- Authority
- US
- United States
- Prior art keywords
- burglar alarm
- electric fire
- alarm connection
- connection
- fire
- 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 - Lifetime
Links
Images
Classifications
-
- 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
Description
(No Model.)
. T WILSON.
EL0TBG PIRE AND BUEGLAR LARM 00NNECTION. N0. 48l,989 Patented Se t. 6, 1892'
Publications (1)
Publication Number | Publication Date |
---|---|
US481989A true US481989A (en) | 1892-09-06 |
Family
ID=2550841
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US481989D Expired - Lifetime US481989A (en) | Electric fire and burglar alarm connection |
Country Status (1)
Country | Link |
---|---|
US (1) | US481989A (en) |
Cited By (1)
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 |
-
0
- US US481989D patent/US481989A/en not_active Expired - Lifetime
Cited By (1)
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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