US2698890A - Automatic fire alarm - Google Patents

Automatic fire alarm Download PDF

Info

Publication number
US2698890A
US2698890A US235881A US23588151A US2698890A US 2698890 A US2698890 A US 2698890A US 235881 A US235881 A US 235881A US 23588151 A US23588151 A US 23588151A US 2698890 A US2698890 A US 2698890A
Authority
US
United States
Prior art keywords
pin
fire alarm
alarm
automatic fire
contact
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
Application number
US235881A
Inventor
Edward H Hughes
Henry M Garrett
Wesley S Garrett
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
Priority to US235881A priority Critical patent/US2698890A/en
Application granted granted Critical
Publication of US2698890A publication Critical patent/US2698890A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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

Definitions

  • the present invention relates to improvements in fire alarms and more particularly to a fire alarm which is adapted for home use.
  • An object of the present invention is to provide a simple automatic fire alarm which embodies the provision of a thermo-responsive coil which is adapted to complete the circuit for an alarm upon a predetermined rise in temperature.
  • a further object of the present invention resides in the provision of means whereby the temperature at which the alarm is set off can be preselected without changing the thermo-responsive coil.
  • Figure 1 is a detailed perspective view of the first form of automatic fire alarm shown in the circuit with the alarm;
  • Figure 2 is a front elevational view of a modified form of automatic fire alarm.
  • Figure 3 is a vertical transverse sectional view taken substantially along the plane of line 33 of Figure 2.
  • the numeral designates generally the first form of automatic fire alarm adapted for use in combination with an alarm 12 of conventional form.
  • the automatic fire alarm 10 is comprised of a common support base 14 to which is centrally attached the substantially U-shaped supporting brackets 16, the brackets having angulated ends 18 and 20 for securement to the base 14.
  • the thermo-responsive coil of spring form 26 has its innermost end secured to the pin 28, the pin 28 being rotatably disposed in the legs 22 and 24 of the U-shaped bracket 16.
  • the outer end of the coil 26 is of flat form and is disposed on the base 14, as seen at 30.
  • the end 30 is formed with an elongated slot 32 through which the lug 34 secured to the base 14 can upwardly extend.
  • a nut 36 is engaged on the lug 34 whereby the tension of the coil 26 can be adjusted by adjustment of the end 30 relative to the base 14.
  • a pair of upstanding elements 38 and 40 which have their lower ends angulated at 42 and 44 for securement to the base 14.
  • the angulated portions 42 and 44 are each provided with upstanding lugs to which the wire ends 46 can be secured by means of the nuts 48.
  • the wires 50 and 52 are connected to the conventional alarm 12 and a source of electric power.
  • Each of these elements 38 and 40 have an outstanding contact post 54 and 56 extending therefrom.
  • the pin 28 has a contact rod 58 secured thereto for rotation therewith and the contact posts 54 and 56 extend into the plane of rotation of said contact rod 58.
  • thermo-responsive coil 26' has its inner end connected to the pin 28' while its outer end is secured to the pin 62 extending through the upper portions of the legs 22 and 24 of the U-shaped bracket 16.
  • the pin 28 has a contact rod 58' connected thereto for rotation therewith upon changes in temperature.
  • the U-shaped bracket 16 On opposing sides of the U-shaped bracket 16 are disposed a pair of arcuate straps 64 and 66 which are secured to the base 14.
  • the straps 64 and 66 are formed with elongated arcuate slots 68 and 70.
  • Each of the slots 68 and 70 has a contact post 72 and 74 adjustably secured therein by means of a pair of nuts 76.
  • the contact 58 upon a predetermined rise in temperature, the contact 58 will contact the contact posts 72 and 74, completing the circuit for an alarm.
  • the alarm can be set for various temperatures by adjusting the positioning of the posts 72 and 74 in the slots 68 and 70.
  • pin 28' is shown as having a threaded end 78 to which the internally threaded sleeve 80 can be secured by supporting the rod 58 for rotation with the pin 28.
  • the inner end of the coil 26 terminates in a sleeve 32 which encircles the pin 28 and is secured thereto.
  • the pin 28' is rotatably journaled in the legs 22 and 24 of the U-shaped bracket 16, a washer 84 being carried by the end of the pin having a retaining pin 86 extending therethrough.
  • a fire alarm mechanism comprising a supporting bracket having a thermal responsive coil supported thereby, the outer end of said coil being secured to said bracket and the other centrally disposed end being secured to a pin rotatably journaled in said bracket, said coil being responsive to temperature change to effect rotation of said pin, a pair of diametrically opposed contact posts connected in an alarm circuit, a contact rod secured to said pin for rotation therewith, said contact posts extending into the plane of rotation of said contact rod whereby a predetermined rise in temperature effects contact between said rod and posts to complete the alarm circuit, a pair of upstandnig straps fixedly secured to a base support common to said supporting bracket, said posts being insulated from each other and from said bracket, said straps being formed with arcuate slots, and said contact posts being adjustably disposed in said slots whereby various preselected temperature changes can effect contact between said rod and posts.
  • An automatic fire alarm comprisin' a base member, a U-shaped bracket mounted on said base, a pin rotatably mounted transversely of said bracket, a spiral thermoresponsive element, one end of said element being fixed to said pin, the other end of said element being fixed to said bracket, a contact rod fixed transverse of said pin, a pair of terminal elements mounted on said base, said terminal elements being disposed on opposite sides of said bracket and insulated therefrom, a contact post on each of said terminal elements, said posts extending into the plane of rotation of said contact rod whereby rotation of said contact rod produces bridging of said posts.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fire Alarms (AREA)

Description

Jan. 4, 1955 HUGHES ETAL 2,698,890
AUTOMATIC FIRE ALARM Filed July 9, 1951 Fig.2
3 Bl-METALL/C H93 Edward H. Hughes Henry M- Garrett Wesley 5. Garrett INVENTORS.
BY mm United States Patent AUTOMATIC FIRE ALARM Edward H. Hughes, Henry M. Garrett, and Wesley S. Garrett, Bastrop, La.
Application July 9, 1951, Serial No. 235,881
2 Claims. (Cl. 200-139) The present invention relates to improvements in fire alarms and more particularly to a fire alarm which is adapted for home use.
An object of the present invention is to provide a simple automatic fire alarm which embodies the provision of a thermo-responsive coil which is adapted to complete the circuit for an alarm upon a predetermined rise in temperature.
A further object of the present invention resides in the provision of means whereby the temperature at which the alarm is set off can be preselected without changing the thermo-responsive coil.
Other objects of the present invention are to provide an automatic fire alarm which is exceedingly simple in construction and economical of manufacture.
Various other objects and advantages will become apparent from the detailed description to follow. The best forms in which we have contemplated applying our invention are clearly illustrated in the accompanying drawings, wherein:
Figure 1 is a detailed perspective view of the first form of automatic fire alarm shown in the circuit with the alarm;
Figure 2 is a front elevational view of a modified form of automatic fire alarm; and,
Figure 3 is a vertical transverse sectional view taken substantially along the plane of line 33 of Figure 2.
Referring more particularly to the drawings, wherein like numerals designate like parts throughout, the numeral designates generally the first form of automatic fire alarm adapted for use in combination with an alarm 12 of conventional form.
The automatic fire alarm 10 is comprised of a common support base 14 to which is centrally attached the substantially U-shaped supporting brackets 16, the brackets having angulated ends 18 and 20 for securement to the base 14. The thermo-responsive coil of spring form 26 has its innermost end secured to the pin 28, the pin 28 being rotatably disposed in the legs 22 and 24 of the U-shaped bracket 16. The outer end of the coil 26 is of flat form and is disposed on the base 14, as seen at 30. The end 30 is formed with an elongated slot 32 through which the lug 34 secured to the base 14 can upwardly extend. A nut 36 is engaged on the lug 34 whereby the tension of the coil 26 can be adjusted by adjustment of the end 30 relative to the base 14.
On opposing sides of the U-shaped bracket 16 are disposed a pair of upstanding elements 38 and 40 which have their lower ends angulated at 42 and 44 for securement to the base 14. The angulated portions 42 and 44 are each provided with upstanding lugs to which the wire ends 46 can be secured by means of the nuts 48. The wires 50 and 52 are connected to the conventional alarm 12 and a source of electric power. Each of these elements 38 and 40 have an outstanding contact post 54 and 56 extending therefrom.
The pin 28 has a contact rod 58 secured thereto for rotation therewith and the contact posts 54 and 56 extend into the plane of rotation of said contact rod 58.
It will thus be seen that upon a predetermined rise in temperature, the coil 26 will effect rotation of the pin 28 and rod 58 whereby the outer ends of the rod 58 will contact the posts 54 and 56 for completing the circuit to the alarm 12. A suitable casing 60 could be provided for the alarm but constitutes no part of the present invention.
In the form of the invention shown in Figure 2, the
thermo-responsive coil 26' has its inner end connected to the pin 28' while its outer end is secured to the pin 62 extending through the upper portions of the legs 22 and 24 of the U-shaped bracket 16. The pin 28 has a contact rod 58' connected thereto for rotation therewith upon changes in temperature.
On opposing sides of the U-shaped bracket 16 are disposed a pair of arcuate straps 64 and 66 which are secured to the base 14. The straps 64 and 66 are formed with elongated arcuate slots 68 and 70. Each of the slots 68 and 70 has a contact post 72 and 74 adjustably secured therein by means of a pair of nuts 76.
It will thus be seen that upon a predetermined rise in temperature, the contact 58 will contact the contact posts 72 and 74, completing the circuit for an alarm. The alarm can be set for various temperatures by adjusting the positioning of the posts 72 and 74 in the slots 68 and 70.
Details of the construction are shown best in Figure 3 wherein the pin 28' is shown as having a threaded end 78 to which the internally threaded sleeve 80 can be secured by supporting the rod 58 for rotation with the pin 28.
The inner end of the coil 26 terminates in a sleeve 32 which encircles the pin 28 and is secured thereto. The pin 28' is rotatably journaled in the legs 22 and 24 of the U-shaped bracket 16, a washer 84 being carried by the end of the pin having a retaining pin 86 extending therethrough.
in view of the foregoing, it is believed that an automatic fire alarm has been provided which will accomplish all of the objects hereinabove set forth. Furthermore, in view of the simplicity of the alarm, a more detailed description is deemed unnecessary.
Having described our invention, what is claimed as new is:
1. A fire alarm mechanism comprising a supporting bracket having a thermal responsive coil supported thereby, the outer end of said coil being secured to said bracket and the other centrally disposed end being secured to a pin rotatably journaled in said bracket, said coil being responsive to temperature change to effect rotation of said pin, a pair of diametrically opposed contact posts connected in an alarm circuit, a contact rod secured to said pin for rotation therewith, said contact posts extending into the plane of rotation of said contact rod whereby a predetermined rise in temperature effects contact between said rod and posts to complete the alarm circuit, a pair of upstandnig straps fixedly secured to a base support common to said supporting bracket, said posts being insulated from each other and from said bracket, said straps being formed with arcuate slots, and said contact posts being adjustably disposed in said slots whereby various preselected temperature changes can effect contact between said rod and posts.
2. An automatic fire alarm comprisin' a base member, a U-shaped bracket mounted on said base, a pin rotatably mounted transversely of said bracket, a spiral thermoresponsive element, one end of said element being fixed to said pin, the other end of said element being fixed to said bracket, a contact rod fixed transverse of said pin, a pair of terminal elements mounted on said base, said terminal elements being disposed on opposite sides of said bracket and insulated therefrom, a contact post on each of said terminal elements, said posts extending into the plane of rotation of said contact rod whereby rotation of said contact rod produces bridging of said posts.
References Cited in the file of this patent UNITED STATES PATENTS 1,618,322 Bettenhausen Feb. 22, 1927 1,641,170 Karlson Sept. 6, 1927 1,672,729 Pape -1 June 5, 1928 1,931,238 Phelan Oct. 17, 1933 1,976,954 Mantz Oct. 16, 1934 2,534,103 Camilli Dec. 12, 1950 2,556,582 Hansen June 12, 1951 FOREIGN PATENTS 8,759 Great Britain Apr. 13, 1909 958,043 France Sept. 5, 1949
US235881A 1951-07-09 1951-07-09 Automatic fire alarm Expired - Lifetime US2698890A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US235881A US2698890A (en) 1951-07-09 1951-07-09 Automatic fire alarm

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US235881A US2698890A (en) 1951-07-09 1951-07-09 Automatic fire alarm

Publications (1)

Publication Number Publication Date
US2698890A true US2698890A (en) 1955-01-04

Family

ID=22887264

Family Applications (1)

Application Number Title Priority Date Filing Date
US235881A Expired - Lifetime US2698890A (en) 1951-07-09 1951-07-09 Automatic fire alarm

Country Status (1)

Country Link
US (1) US2698890A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2827533A (en) * 1956-10-13 1958-03-18 Cachelin & Clemence Apparatus for detecting abnormal temperatures
US5825294A (en) * 1997-07-25 1998-10-20 Krueger; Huck H. O. Thermostatic heat detector

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190908759A (en) * 1908-04-10 Baptifaut Alexis Improvements in Fire Alarms.
US1618322A (en) * 1925-06-30 1927-02-22 Charles C Bettenhausen Automatic fire alarm
US1641170A (en) * 1926-04-15 1927-09-06 Gustav V Karlson Light-operated-controlling apparatus
US1672729A (en) * 1924-12-17 1928-06-05 Gen Electric Magnetic cut-out plug
US1931238A (en) * 1926-12-22 1933-10-17 Honeywell Regulator Co Electrical switch
US1976954A (en) * 1931-07-01 1934-10-16 Milwaukee Gas Specialty Co Control device
FR958043A (en) * 1945-04-13 1950-03-02
US2534103A (en) * 1949-09-24 1950-12-12 Gen Electric Three-phase bimetal thermal relay
US2556582A (en) * 1946-01-23 1951-06-12 Dansk Telefonalarm Aktieselska Thermoelectric switch

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190908759A (en) * 1908-04-10 Baptifaut Alexis Improvements in Fire Alarms.
US1672729A (en) * 1924-12-17 1928-06-05 Gen Electric Magnetic cut-out plug
US1618322A (en) * 1925-06-30 1927-02-22 Charles C Bettenhausen Automatic fire alarm
US1641170A (en) * 1926-04-15 1927-09-06 Gustav V Karlson Light-operated-controlling apparatus
US1931238A (en) * 1926-12-22 1933-10-17 Honeywell Regulator Co Electrical switch
US1976954A (en) * 1931-07-01 1934-10-16 Milwaukee Gas Specialty Co Control device
FR958043A (en) * 1945-04-13 1950-03-02
US2556582A (en) * 1946-01-23 1951-06-12 Dansk Telefonalarm Aktieselska Thermoelectric switch
US2534103A (en) * 1949-09-24 1950-12-12 Gen Electric Three-phase bimetal thermal relay

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2827533A (en) * 1956-10-13 1958-03-18 Cachelin & Clemence Apparatus for detecting abnormal temperatures
US5825294A (en) * 1997-07-25 1998-10-20 Krueger; Huck H. O. Thermostatic heat detector

Similar Documents

Publication Publication Date Title
US2199638A (en) Thermostat
US2563341A (en) Humidity control
US2830166A (en) Control connector plug
US2698890A (en) Automatic fire alarm
US2456030A (en) Electric soldering iron
US1402417A (en) Heat-responsive current-controlling device
US2109169A (en) Thermal operated circuit controlling device
US2357533A (en) Automatic alarm switch
US2286518A (en) Fusible protective device
US2740864A (en) Precision thermostatic switch
US2769248A (en) Drier
US1903015A (en) Electric heating pad and control therefor
US2928918A (en) Snap action switch
US2234347A (en) Electric smoothing iron and in support forming current supply plugs for said irons
US2567112A (en) Automatic electrical control for furnaces and fire alarms
US2320873A (en) Thermostat
US2375967A (en) Circuits
US2116858A (en) Thermostat switch
US2898439A (en) Control device
US1824114A (en) Thermostat
US1789548A (en) Indicator switch
US2264276A (en) Thermostat
US2136740A (en) Fire alarm
US2889429A (en) Flasher
US1484816A (en) Thermostatic circuit-controlling device