US643722A - Thermostat. - Google Patents

Thermostat. Download PDF

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Publication number
US643722A
US643722A US69648898A US1898696488A US643722A US 643722 A US643722 A US 643722A US 69648898 A US69648898 A US 69648898A US 1898696488 A US1898696488 A US 1898696488A US 643722 A US643722 A US 643722A
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Prior art keywords
wire
piece
thermostat
contact
movable
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Expired - Lifetime
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US69648898A
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Charles Edward May
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/46—Thermally-sensitive members actuated due to expansion or contraction of a solid
    • H01H37/50—Thermally-sensitive members actuated due to expansion or contraction of a solid with extensible wires under tension

Definitions

  • This invention relates to thermostats for detecting the presence of fire in a building and completing an electric circuit when the building becomes unduly heated for the purpose of operating an alarm.
  • the drawing shows a front view of the thermostat.
  • B is a metallic wire, which is stretched between two supports N, one of which is preferably provided with some approved means, such as a screw n, for adjusting the tension of the wire to a prearranged degree of heat, which is not to be exceeded without giving an alarm.
  • D is a movable contact-piece suspended from the wire B between the supports N and descending by gravity when the wire is heated.
  • the stationary contact-piece is a stationary contact-piece arranged in the downward path of the movable contactpiece.
  • the stationary contact-piece may be set or adjusted vertically in any approved manner, and it preferably consists of a cup partially filled with mercury.
  • A are the line-wires of a battery K, and I is an annu'nciator included in the circuit.
  • One wire A is connected to one of the supports N, and the other wire A is connected to the contact-piece E.
  • ⁇ Vhat I claim is The combination, with a metallic wire, and means for stretching it; of a movable contact-piece suspended from the wire between its ends and descending by gravity when the Wire is heated, and a stationary contact-piece arranged in the downward path of the movable contact-piece, substantially as set forth.

Description

No. 643,722. Pat ented Feb. 20, 1900.
C. E. MAY. THERMOSTAT.
(Application filed Nov. 14, 1898.) (lo Iodul.)
I a 3 w I mm wad wows amvemtoz ww WZ Z M 951 amw UNITED STATES PATENT OFFICE.
CHARLES EDWARD MAY, OF DUNEDIN, NEW ZEALAND.
TH ERMOSTAT.
SPECIFICATION forming part of Letters Patent No. 643,722, dated February 20, 1900.
Application filed November 14, 1898. Serial No. 696,488. (No model.)
To ctZZ whom it may concern:
Be it known that 1, CHARLES EDWARD MAY, of Dunedin, New Zealand, have invented certain new and useful Improvements in Thermostats, of which the following is a specification.
This invention relates to thermostats for detecting the presence of fire in a building and completing an electric circuit when the building becomes unduly heated for the purpose of operating an alarm.
The drawing shows a front view of the thermostat.
B is a metallic wire, which is stretched between two supports N, one of which is preferably provided with some approved means, such as a screw n, for adjusting the tension of the wire to a prearranged degree of heat, which is not to be exceeded without giving an alarm.
D is a movable contact-piece suspended from the wire B between the supports N and descending by gravity when the wire is heated.
E is a stationary contact-piece arranged in the downward path of the movable contactpiece. The stationary contact-piece may be set or adjusted vertically in any approved manner, and it preferably consists of a cup partially filled with mercury.
A are the line-wires of a battery K, and I is an annu'nciator included in the circuit. One wire A is connected to one of the supports N, and the other wire A is connected to the contact-piece E.
When a fire occurs in a building supplied with one or more of these devices and the heat is so great as to cause the movable con tact-piece to complete the circuit, an alarm is sounded.
\Vhat I claim is The combination, with a metallic wire, and means for stretching it; of a movable contact-piece suspended from the wire between its ends and descending by gravity when the Wire is heated, and a stationary contact-piece arranged in the downward path of the movable contact-piece, substantially as set forth.
Dated this 4th day of August, 1898.
CHARLES EDWARD MAY.
lVitnesses:
CHARLES MAY, ROBERT LANGTON.
US69648898A 1898-11-14 1898-11-14 Thermostat. Expired - Lifetime US643722A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US69648898A US643722A (en) 1898-11-14 1898-11-14 Thermostat.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US69648898A US643722A (en) 1898-11-14 1898-11-14 Thermostat.

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US643722A true US643722A (en) 1900-02-20

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US69648898A Expired - Lifetime US643722A (en) 1898-11-14 1898-11-14 Thermostat.

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US (1) US643722A (en)

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