GB2122346A - Combined thermometer-fire alarm device - Google Patents

Combined thermometer-fire alarm device Download PDF

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Publication number
GB2122346A
GB2122346A GB08301524A GB8301524A GB2122346A GB 2122346 A GB2122346 A GB 2122346A GB 08301524 A GB08301524 A GB 08301524A GB 8301524 A GB8301524 A GB 8301524A GB 2122346 A GB2122346 A GB 2122346A
Authority
GB
United Kingdom
Prior art keywords
pointer
temperature
switch
fire alarm
sensor
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.)
Granted
Application number
GB08301524A
Other versions
GB2122346B (en
GB8301524D0 (en
Inventor
Daiyu Hara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of GB8301524D0 publication Critical patent/GB8301524D0/en
Publication of GB2122346A publication Critical patent/GB2122346A/en
Application granted granted Critical
Publication of GB2122346B publication Critical patent/GB2122346B/en
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K5/00—Measuring temperature based on the expansion or contraction of a material
    • G01K5/48—Measuring temperature based on the expansion or contraction of a material the material being a solid
    • G01K5/56—Measuring temperature based on the expansion or contraction of a material the material being a solid constrained so that expansion or contraction causes a deformation of the solid
    • G01K5/62—Measuring temperature based on the expansion or contraction of a material the material being a solid constrained so that expansion or contraction causes a deformation of the solid the solid body being formed of compounded strips or plates, e.g. bimetallic strip
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K3/00—Thermometers giving results other than momentary value of temperature
    • 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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Fire-Detection Mechanisms (AREA)
  • Fire Alarms (AREA)

Abstract

The device comprises a helical bimetallic temperature sensor; a pointer connected to said sensor so as to be movable in response to the expansion and contraction of said temperature sensor caused by changes in the ambient temperature, whereby the pointer provides a visual indication of said ambient temperature; a switch mounted adjacent the path of movement of said pointer at a position corresponding to a predetermined elevated temperature and actuable by means carried by said pointer when it moves to said position; and an audible alarm activated by actuation of said switch, thereby to provide an audible warning that said predetermined temperature has been reached. As disclosed, the pointer carries a magnet which operates a reed switch mounted on the rear face of a dial 1. A circuit activates a buzzer when a battery for the alarm drops below a certain voltage output. <IMAGE>

Description

SPECIFICATION Combined thermometer-fire alarm device This invention relates to a combined thermometerfire alarm device comprising a thermometer linked to a fire alarm so that when a predetermined high ambient temperature is sensed by the thermometer the fire alarm automatically sounds a warning.
In one type of thermometer known in the art, a bimetallic member in a spiral form is provided which expands and contracts as the ambient temperature varies and as it does so it moves a pointer across a calibrated dial. This type of thermometer, of course, only provides a visual indication of temperature.
Meanwhile fire alarms have been available which comprise temperature sensor linked to a buzzer which automatically produces a bussing sound when predetermined high temperature is sensed.
These alarms, however, do not provide any visible indication of temperature.
This invention has been developed for the purpose of obviating the aforesaid disadvantages of the prior art, and it has for its object the provision of a combined thermometer-fire alarm device comprising a thermometer providing a visual indication of both normal as well as abnormally high ambient temperatures, linked to a fire alarm which is sounded automatically when the ambient temperature reaches a predetermined high level.
In accordance with the present invention there is provided a combined thermometer-fire alarm device which comprises a helical bimetallic temperature sensor; a pointer connected to said sensor so as to be movable in response to the expansion and contraction of said temperature sensor caused by changes in the ambient temperature, whereby the pointer provides a visual indication of said ambient temperature; a switch mounted adjacent the path of movement of said pointer at a position corresponding to a predetermined elevated temperature and actuable by means carried by said pointer when it moves to said position; and an audible alarm activated by actuation of said switch, thereby to provide an audible warning that said predetermined temperature has been reached.
A preferred device of this invention comprises a reed switch which is actuated by a magnet carried by the pointer of the thermometer, to activate a buzzer when the predetermined high ambient temperature is reached.
The invention will now be described further with reference to the accompanying drawings, in which: Figure 1 is a perspective view of a combined thermometer-fire alarm device in accordance with a preferred embodiment ofthe invention; Figure 2 shows the back of the front cover of the device as viewed from the rear of the device shown in Figure 1; Figure 3 is a front view of the dial of the device; Figure 4 is a right side view of the dial of the device shown in Figure 3; Figure 5 is a view of the back of the dial of the thermometer as viewed from the rear of the device shown in Figure 1; Figure 6 is a sectional view of the reed switch, taken along the center line; and Figure 7 is an electric circuit diagram.
In the drawings, the numeral 1 designates a temperature-calibrated dial of a thermometer formed eg of aluminium. The numeral 2 designates an arborjournalled on bearings 3 and projecting through opposite side surfaces of the dial 1.The arbor 2 has a pointer 4 secured to its upper end, and a helical bimetallic temperature sensor 6 secured at its center to the lower end of the arbor 2. The numeral 5 designates a guide securedly fixed to the back of the dial 1 and having its forward end portion bent perpendicular to the surface of the dial 1 to provide a bent portion formed with a slit to receive a free forward end portion of the bimetallic sensor 6.
The numeral 7 designates a reed switch of the known type shown in Figure 6, which is affixed in a recess on the back of the dial in a position corresponding to a predetermined high temperature indicated on the dial 1 at which the audible alarm is to be sounded. The reed switch 7 may be affixed to the recess on the back of the dial 1 through a base plate.
Secured to the back of the pointer 4 is a magnet 8 which is brought, as the pointer 4 moves, to a position adjacent to that of the reed switch 7. The numerals 9, 10 and 11 designate a buzzer, a battery and a case, respectively, of the audible alarm. The numerals 1 1b and 1 1c designate sound-releasing openings in the case 11, and numeral 17 is a voltage sensor for sensing the voltage level of the battery 10.
Operation of the embodiment described is as follows. Expansion and contraction of the helical bimetallic sensor 6 due to changes in ambient temperature, cause the forward end of the bimetallic sensor 6 to slidably move in the slit of the guide plate 5 to allow the helical bimetallic sensor 6 to move clockwise and counterclockwise about its center. As a result, the pointer 4 moves as the arbor is rotated by the movement of the bimetallic sensor 6, to thereby visually indicate the ambient temperature.If the ambient temperature rises and reaches the preset high temperature level (48 C, for example) at which it is desired that the audible alarm be sounded, the pointer 4 moves to the position on the dial 1 opposite to that of the reed switch 7 at the back of the dial 1 whereupon the reed switch 7 is closed by the magnet 8 and the circuit of the buzzer 9 is formed. This actuates the buzzer 9 which makes a continuous buzzing sound.
As soon as the voltage of the battery 10 of the buzzer circuit drops below a predetermined level, the voltage sensor 17 senses such drop and actuates an oscillating section 18 to transmit pulses to the buzzer 9 to form and break the circuit of the buzzer 9, to cause the buzzer 9 to operate intermittently, thereby providing an audible warning of the need to recharge or replace the battery.
From the foregoing description, twill beappreci- ated that the combined thermometer-fire alarm device illustrated can be used both as a thermometer under normal conditions, and at the same time can serve as a fire alarm when the room temperature rises to an inordinately high level and there is a risk of a fire breaking out. In addition, the device enables such abnormally high temperature conditions to be visually indicated. The device is thus of great benefit in helping to provide a warning of a fire risk.

Claims (4)

1. A combined thermometer-fire alarm device, comprising a helical bimetallic temperature sensor; a pointer connected to said sensor so as to be movable in response to the expansion and contraction of said temperature sensor caused by changes in the ambient temperature, whereby the pointer provides a visual indication of said ambient temperature; a switch mounted adjacent the path of movement of said pointer at a position corresponding to a predetermined elevated temperature and actuable by means carried by said pointer when it moves to said position; and an audible alarm activated by actuation of said switch, thereby to provide an audible warning that said predetermined temperature has been reached.
2. A device according to Claim 1, wherein said pointer is adapted to move across a dial which is calibrated to indicate said ambienttempernture.
3. A device according to Claim 1 or Claim 2, wherein said switch is a reed switch and said means for actuating said switch carried by said pointer is a magnet.
4. A combined thermometer-fire alarm device substantially as hereinbefore described with reference to the accompanying drawings.
GB08301524A 1982-06-24 1983-01-20 Combined thermometer-fire alarm device Expired GB2122346B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9466682U JPS59923U (en) 1982-06-24 1982-06-24 Thermometer with fire alarm

Publications (3)

Publication Number Publication Date
GB8301524D0 GB8301524D0 (en) 1983-02-23
GB2122346A true GB2122346A (en) 1984-01-11
GB2122346B GB2122346B (en) 1986-05-21

Family

ID=14116566

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08301524A Expired GB2122346B (en) 1982-06-24 1983-01-20 Combined thermometer-fire alarm device

Country Status (4)

Country Link
JP (1) JPS59923U (en)
DE (1) DE3303020A1 (en)
FR (1) FR2529331A1 (en)
GB (1) GB2122346B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60166354U (en) * 1984-04-13 1985-11-05 石橋　晃 Electromagnetic footlifter
JPH029825Y2 (en) * 1984-12-21 1990-03-12
JPH029826Y2 (en) * 1984-12-21 1990-03-12
JPH0332370Y2 (en) * 1987-04-17 1991-07-09
JPH0325793Y2 (en) * 1987-12-26 1991-06-04

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US815417A (en) * 1905-06-26 1906-03-20 Harleston Corbett Gesner Filter.
GB346183A (en) * 1929-05-21 1931-04-09 Schmidt'sche Heissdampf-Gesellschaft, Mit Beschraenkter Haftung
GB413264A (en) * 1932-10-07 1934-07-12 Gen Electric Improvements in and relating to electro-dynamic devices for the conversion of measuring values
GB630441A (en) * 1943-03-06 1949-10-13 Leo Roman Bolte Improvements in or relating to thermostatically controlled electric sadirons or similar appliances
GB992079A (en) * 1963-03-29 1965-05-12 Rudolf Blessing Clocks
GB1025527A (en) * 1962-06-22 1966-04-14 Powers Regulator Co Temperature sensing device
GB1284361A (en) * 1970-02-02 1972-08-09 Kroyer K K K Cooking utensil
GB2077470A (en) * 1980-06-04 1981-12-16 Perkins Jean K Fluid temperature indicator

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7319092U (en) * 1974-03-21 Wolf K Fire alarm triggering device
US2822534A (en) * 1955-09-16 1958-02-04 Frank R Odlum Fire alarm
US3281813A (en) * 1964-04-20 1966-10-25 Mcdonalds System Inc Temperature sensing and indicating system
NL165878C (en) * 1975-02-14 1981-05-15 Eerste Nl Fab Manometers CONTROL DEVICE FOR ADJUSTING THE WATER TEMPERATURE OF A CENTRAL HEATING BOILER DEPENDING ON THE OUTDOOR TEMPERATURE.
JPS5511916Y2 (en) * 1976-07-03 1980-03-14
US4302753A (en) * 1978-01-26 1981-11-24 Pittway Corporation Multi-function combustion detecting device
JPS5588658U (en) * 1978-12-13 1980-06-19

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US815417A (en) * 1905-06-26 1906-03-20 Harleston Corbett Gesner Filter.
GB346183A (en) * 1929-05-21 1931-04-09 Schmidt'sche Heissdampf-Gesellschaft, Mit Beschraenkter Haftung
GB413264A (en) * 1932-10-07 1934-07-12 Gen Electric Improvements in and relating to electro-dynamic devices for the conversion of measuring values
GB630441A (en) * 1943-03-06 1949-10-13 Leo Roman Bolte Improvements in or relating to thermostatically controlled electric sadirons or similar appliances
GB1025527A (en) * 1962-06-22 1966-04-14 Powers Regulator Co Temperature sensing device
GB992079A (en) * 1963-03-29 1965-05-12 Rudolf Blessing Clocks
GB1284361A (en) * 1970-02-02 1972-08-09 Kroyer K K K Cooking utensil
GB2077470A (en) * 1980-06-04 1981-12-16 Perkins Jean K Fluid temperature indicator

Also Published As

Publication number Publication date
FR2529331A1 (en) 1983-12-30
JPS59923U (en) 1984-01-06
GB2122346B (en) 1986-05-21
DE3303020A1 (en) 1984-01-05
GB8301524D0 (en) 1983-02-23

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PCNP Patent ceased through non-payment of renewal fee