US647565A - Electric thermostat for fire-alarms. - Google Patents
Electric thermostat for fire-alarms. Download PDFInfo
- Publication number
- US647565A US647565A US72679199A US1899726791A US647565A US 647565 A US647565 A US 647565A US 72679199 A US72679199 A US 72679199A US 1899726791 A US1899726791 A US 1899726791A US 647565 A US647565 A US 647565A
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- US
- United States
- Prior art keywords
- fire
- alarms
- wires
- electric thermostat
- electric
- 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
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/06—Electric actuation of the alarm, e.g. using a thermally-operated switch
Definitions
- HAMMOND V. HAYES OF CAMBRIDGE, AND GEORGE K. THOMPSON, OF ALDEN, llIASSACHUSETTS, ASSIGNORS TO THE AMERICAN BELL TELEPHONE COMPANY, OF BOSTON, MASSACHUSETTS.
- the thermostat is of the cable form,in which two wire conductors normally out of electrical contact are adapted to complete an electric circuit containing the fire-alarm apparatus by the fusion of a third wire composed of metal melting at a required temperature.
- the two conducting-wires are insulated from each other and from the fusible wire by open-work non-conducting material surrounding one or both of the wires and all three wires in a bunch are surrounded by asbestos cloth, asbestos pa- 1 length of the fusible wire, and Fig. 4 shows a short length of the exterior covering of the cable.
- the two conducting-wires are marked a 662. They are preferably of copper coated with tin. As shown, both are covered with an open-work braiding of insulating material I). Asbestos thread is the best material for such insulating material; but hard linen thread or cotton thread will answer the purpose, and it would also answer the purpose to cover but one of the conducting-wires with the braid.
- the fusible wire is marked a. As shown the imity may be adopted.
- Asbestos thread makes the best insu lation, because there is no ash resulting there from when the fusible wire melts; but such ash as results from the combustion of cotton or linen thread does not materially interfere with the operation of the cable if the braiding is coarse in the sense that the openings between the threads are as large as possible consistent with normal good insulation.
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- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Insulated Conductors (AREA)
Description
Patented Apr. :7, I900.
H. V. HAYES 8v. G. K. THOMPSON.
ELECTRIC THEBMUSTAT FUR FIRE ALARMS.
(Apfilication filed Aug. 10, 1899.)
(No Model.)
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UNITED STATES PATENT OFFICE.
HAMMOND V. HAYES, OF CAMBRIDGE, AND GEORGE K. THOMPSON, OF ALDEN, llIASSACHUSETTS, ASSIGNORS TO THE AMERICAN BELL TELEPHONE COMPANY, OF BOSTON, MASSACHUSETTS.
ELECTRIC THERMOSTAT FOR FIRE-ALARMS.
SPECIFICATION forming part of Letters Patent No. 647,565, dated April 17, 1900.
Application filed August 10, 1899. Serial No. 726,791. (No model.) V
T0 to whom it may concern.-
Be it known thatwe,HAMMOND V. HAYES, residing at Cambridge, and GEORGE K. THOMP- soN, residing at Walden, in the county of Middlesex and State of Massachusetts, have invented certain Improvements in Electric Thermostats for Fire-Alarms, of which the following is a specification.
The thermostat is of the cable form,in which two wire conductors normally out of electrical contact are adapted to complete an electric circuit containing the fire-alarm apparatus by the fusion of a third wire composed of metal melting at a required temperature. In our improved construction the two conducting-wires are insulated from each other and from the fusible wire by open-work non-conducting material surrounding one or both of the wires and all three wires in a bunch are surrounded by asbestos cloth, asbestos pa- 1 length of the fusible wire, and Fig. 4 shows a short length of the exterior covering of the cable.
The two conducting-wires are marked a 662. They are preferably of copper coated with tin. As shown, both are covered with an open-work braiding of insulating material I). Asbestos thread is the best material for such insulating material; but hard linen thread or cotton thread will answer the purpose, and it would also answer the purpose to cover but one of the conducting-wires with the braid. The fusible wire is marked a. As shown the imity may be adopted.
wires and the fusible wire thus insulated from each other are covered with a ribbon of asbestos paper at, wound in an overlapping cylindrical spiral or with any material not destructible by heat unless at a temperature far above that at which the material used for the fusible wirev melts. In the operation this outer covering holds the molten metal to which the fusible wire is reduced by heat until the molten metal penetrating the openwork insulation of the conducting-wires establishes an electrical connection between them. Asbestos thread makes the best insu lation, because there is no ash resulting there from when the fusible wire melts; but such ash as results from the combustion of cotton or linen thread does not materially interfere with the operation of the cable if the braiding is coarse in the sense that the openings between the threads are as large as possible consistent with normal good insulation.
It is unnecessary to show or describe electrio fire-alarm apparatus with which the cable embodying our invention as above described may be used.
We claim- 1. An electric thermostat, consisting of two conducting-wires and a wire of fusible mate rial covered with material not readily de- HAMMOND V. HAYES. GEORGE K. THOMPSON.
Witnesses:
GEO. WILLIS PIERCE, JOSEPH A. GATELY.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US72679199A US647565A (en) | 1899-08-10 | 1899-08-10 | Electric thermostat for fire-alarms. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US72679199A US647565A (en) | 1899-08-10 | 1899-08-10 | Electric thermostat for fire-alarms. |
Publications (1)
Publication Number | Publication Date |
---|---|
US647565A true US647565A (en) | 1900-04-17 |
Family
ID=2716138
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US72679199A Expired - Lifetime US647565A (en) | 1899-08-10 | 1899-08-10 | Electric thermostat for fire-alarms. |
Country Status (1)
Country | Link |
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US (1) | US647565A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2518788A (en) * | 1947-08-14 | 1950-08-15 | Frank W Jackson | Heat responsive alarm cable |
US2992310A (en) * | 1952-07-08 | 1961-07-11 | Babany Albert | Fire detector made of two special electric wires |
-
1899
- 1899-08-10 US US72679199A patent/US647565A/en not_active Expired - Lifetime
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2518788A (en) * | 1947-08-14 | 1950-08-15 | Frank W Jackson | Heat responsive alarm cable |
US2992310A (en) * | 1952-07-08 | 1961-07-11 | Babany Albert | Fire detector made of two special electric wires |
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