US2697215A - Temperature change and fire alarm apparatus - Google Patents

Temperature change and fire alarm apparatus Download PDF

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Publication number
US2697215A
US2697215A US259345A US25934551A US2697215A US 2697215 A US2697215 A US 2697215A US 259345 A US259345 A US 259345A US 25934551 A US25934551 A US 25934551A US 2697215 A US2697215 A US 2697215A
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US
United States
Prior art keywords
relay
circuit
contacts
fire alarm
contact
Prior art date
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Expired - Lifetime
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US259345A
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English (en)
Inventor
Jr James Morris
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Individual
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Individual
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Publication date
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Publication of US2697215A publication Critical patent/US2697215A/en
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Classifications

    • 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

  • the invention can be used due to friction between the roller and the retarded or Yet again, the propeller shaft of a ship is a sensitive piece of machinery wherein an abnormal heating is indicative of undesirable conditions.
  • Figure 1 is a circuit diagram of a fire accordance with the invention
  • Fig. 2 is a broken front elevation of a mounting conalarm system in 2,697,215 Patented Dec. 14, 1954 elevation of the appropriate cover used below it;
  • Figure 9 is a front elevation of part of a Wheatstone bridge where a comparision of temperatures at difierent places is obtained.
  • Figure 10 is a similar view of a complementary part at the other place.
  • the ratio arms 16 and 17 consist of fixed resistors, with a potentiometer adjustment 18 between the series arms 14 and 17.
  • a voltage sensitive indicator 19 is connected across the bridge in well known manner.
  • the second closure is provided by'the contact set 33 which consists of a moving contact balanced between two fixed contacts.
  • the control of this set is efiected by means of a pair of solenoids 34,, 35,, arranged in opposition on either side thereof and balanced by potentiometer 36.
  • the one solenoid 34 is arranged in series with the bridge and will be affected. by any change in. the current therein; the other solenoid 35 is independent of the bridge.
  • the third closure is that over contacts 38 of relay 39 arranged in series with the indicator 19 across the Wheatstone bridge.
  • the total current through the Wheatstone bridge i. e. that through the solenoid 34, may be of the order or 50 milli-amperes splitting, when the bridge is balanced, into two parts each of 25 milli-amperes through each of the two parallel branches of the bridge.
  • the resistance of said solenoid 34- is small, say 1 ohm, as compared with that of the bridge as a whole which, with each of the arms at 150 ohms would have an equivalent resistance of 150 ohms.
  • the order of current through the indicator 19 necessary to engage contacts 20 and 21 would be measured in micro-amperes, and would correspond to a change in the relative resistance of arms 13 and 14 of /2 ohm.
  • a fault in the nature of a short on arm 13 or in the nature of a break in 14 will engage contacts 20, 22, and/or operate relay 39, and/or close contacts 33.
  • relay 28 may also be energized by the closing of contacts 20, 22 and by the closing of contacts 33. However energized, relay 28 operates to disable the fire alarm circuit, provided relay 23 has not become energized and closed its holding circuit before the energization of relay 28.
  • FIGs. 2, 3, 4, and 5 an arrangement of two sets of three detectors b1 and 01 is shown in which they are mounted under a ceiling 41, and carried by supports 42.
  • the detectors [)1 may be considered as the more sensitive detectors and the detectors c1 as the less sensitive detectors.
  • the two sets of detectors are enclosed by a cover 43 provided with holes 44 to attord access for the air to the interior and the bottom of the cover has on it imperforate channels 45 to receive the less sensitive detectors c1 and to protect them still further from the heat.
  • detectors b1 and 01 are in separate supports42 below the ceiling 41, either side by side as in Figs. 6 and 8 or end to end as in Fig. 7., the supports 42 having secured to their lower ends a cover 43 having holes 44 below the more sensitive under the less sensitive detectors c1, whereby they are protected.
  • Figs. 9 and 10 an arrangement is shown wherein the more sensitive detector b1 is shown in its position and the less sensitive 01 is shown as completely removed from it and is protected, not by a cover as in the previous arrangements described, but by being removed to any desired distance.
  • An electrically operated alarm system comprising an electric circuit including two parallel branches, a
  • a bridge connection across the branches including a voltage sensitive indicator having a movable electrical contact and a relay in series with the indicator including a normally open contact, the indicator being operatively responsive to a lesser current than the relay, a fire alarm circuit and a defect alarm circuit each including a normally open contact, a relay solenoid in control of each normally open contact, the solenoid in control of the said contact in the fire alarm circuit being relatively slow operating, and a normally open circuit for each alarm circuit relay solenoid, each normally open circuit including a fixed contact, the two fixed contacts being alternatively engageable by the movable contact of the indicator, the fixed contact in the circuit for the solenoid in control of the contact in the defect alarm circuit being connected in parallel with the normally open contact of the relay in the bridge connection and a normally closed contact in the circuit for the relay solenoid in control of the contact in the fire alarm circuit operatively related to the solenoid in control of the contact in the defect alarm circuit.
  • circuit for the relay solenoidin control of the contact in the defect alarm circuit includes another movable contact in parallel with the contact of the relay in the bridge connection, together with a solenoid responsive to current changes in the electric circuit and arranged in control of the said other movable contact.

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  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire Alarms (AREA)
  • Fire-Detection Mechanisms (AREA)
US259345A 1950-12-04 1951-12-01 Temperature change and fire alarm apparatus Expired - Lifetime US2697215A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB301288X 1950-12-04
GB251051X 1951-10-25

Publications (1)

Publication Number Publication Date
US2697215A true US2697215A (en) 1954-12-14

Family

ID=26257500

Family Applications (1)

Application Number Title Priority Date Filing Date
US259345A Expired - Lifetime US2697215A (en) 1950-12-04 1951-12-01 Temperature change and fire alarm apparatus

Country Status (6)

Country Link
US (1) US2697215A (xx)
BE (1) BE507587A (xx)
CH (1) CH301288A (xx)
DE (1) DE969456C (xx)
FR (1) FR1056104A (xx)
NL (2) NL165764B (xx)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3071713A (en) * 1959-01-20 1963-01-01 Grinnell Corp Automatic rate of rise-responsive fire protection circuit
US3188617A (en) * 1962-01-03 1965-06-08 Specialties Dev Corp Condition responsive system with prevention of false indication
US3350702A (en) * 1965-01-26 1967-10-31 Ruth A Herman Infrared detection system for fault isolation and failure prediction
US20100158068A1 (en) * 2008-12-22 2010-06-24 Embraer - Empresa Brasileira De Aeronautica S.A. Bleed leakage detection system and method

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1566727B1 (de) * 1967-09-08 1972-03-09 Rheinische Braunkohlenw Ag Temperaturmessanordnung fuer eine Feueralarmanlage
DE2627357C3 (de) * 1976-06-18 1981-05-27 Preussag Ag Feuerschutz, 2060 Bad Oldesloe Temperaturmelder

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1326304A (en) * 1919-12-30 Automatic fire
US1718857A (en) * 1919-12-22 1929-06-25 Elliott Otto Breedon Automatic fire alarm
US1977121A (en) * 1926-09-11 1934-10-16 Ericsson Telefon Ab L M Fire alarm system
US2041114A (en) * 1934-11-14 1936-05-19 Louis F B Carini Electrical discharge tube circuits
US2060215A (en) * 1931-05-05 1936-11-10 American District Telegraph Co Electric temperature and burglar alarm system
US2074262A (en) * 1934-09-22 1937-03-16 Kidde & Co Walter Supervised electric alarm system
US2486753A (en) * 1946-03-29 1949-11-01 Union Switch & Signal Co Hot bearing detector

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE146034C (xx) *
DE633386C (de) * 1926-04-26 1936-07-28 Charles Edward Adrianus Maitla Schaltungsanordnung fuer Alarmanlagen
DE735401C (de) * 1939-07-29 1943-05-14 Walther & Cie Ag Schutzschaltung fuer Feuermelder mit Differential-Thermoelementen
DE895416C (de) * 1942-04-30 1953-11-02 Siemens Ag Feuer- oder Gefahrmeldeanlage, insbesondere fuer Schiffe
DE867819C (de) * 1950-04-28 1953-02-19 Normalzeit G M B H Schaltungsanordnung zur UEbertragung von Meldungen von oertlich verteilt liegenden Meldestellen nach einer zentralen Meldesammelstelle

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1326304A (en) * 1919-12-30 Automatic fire
US1718857A (en) * 1919-12-22 1929-06-25 Elliott Otto Breedon Automatic fire alarm
US1977121A (en) * 1926-09-11 1934-10-16 Ericsson Telefon Ab L M Fire alarm system
US2060215A (en) * 1931-05-05 1936-11-10 American District Telegraph Co Electric temperature and burglar alarm system
US2074262A (en) * 1934-09-22 1937-03-16 Kidde & Co Walter Supervised electric alarm system
US2041114A (en) * 1934-11-14 1936-05-19 Louis F B Carini Electrical discharge tube circuits
US2486753A (en) * 1946-03-29 1949-11-01 Union Switch & Signal Co Hot bearing detector

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3071713A (en) * 1959-01-20 1963-01-01 Grinnell Corp Automatic rate of rise-responsive fire protection circuit
US3188617A (en) * 1962-01-03 1965-06-08 Specialties Dev Corp Condition responsive system with prevention of false indication
US3350702A (en) * 1965-01-26 1967-10-31 Ruth A Herman Infrared detection system for fault isolation and failure prediction
US20100158068A1 (en) * 2008-12-22 2010-06-24 Embraer - Empresa Brasileira De Aeronautica S.A. Bleed leakage detection system and method
US8696196B2 (en) * 2008-12-22 2014-04-15 Embraer S.A. Bleed leakage detection system and method

Also Published As

Publication number Publication date
NL85577C (xx)
FR1056104A (fr) 1954-02-24
CH301288A (de) 1954-08-31
DE969456C (de) 1958-06-04
NL165764B (nl)
BE507587A (xx)

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