US2378080A - Thermal switch - Google Patents
Thermal switch Download PDFInfo
- Publication number
- US2378080A US2378080A US494750A US49475043A US2378080A US 2378080 A US2378080 A US 2378080A US 494750 A US494750 A US 494750A US 49475043 A US49475043 A US 49475043A US 2378080 A US2378080 A US 2378080A
- Authority
- US
- United States
- Prior art keywords
- conductor
- frame
- thermal switch
- sheet
- switch
- 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
Links
Images
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
- This invention relates to new and useful improvements in thermal switches for fire alarm systems and the like, the same being a division of my co-pending application Serial No. 476,935, filed-February 24, 1943, for Signal system.
- the principal object of the present invention is to provide a thermal switch which will operate promptly upon submission to heat of a predetermined temperature, for the purpose of closing a signal system or circuits of other nature.
- Another important object of the invention is to provide a thermal switch which can be manufactured in convenient useful units and which can be installed in homes and elsewhere by unskilled labor.
- Figure 1 is a top plan view of the switch.
- Figure 2 is an end elevational view.
- Figure 3 is a transverse sectional view taken on the line 3-3 of Figure 1.
- Figure 4 is a longitudinal sectional view through the device.
- Figure 5 is a perspective view of a sheet of destructible material such as is employed in the switch.
- each of the switch units consists of a frame 1 which may be of any suitable material and each corner of this frame has a bracket 8 apertured to receive suitable securing elements for securing the thermal switch unit to the ceiling as shown in Figure 2.
- a conductor i0 At the inner side portions of opposed sides of the frame I are eyes 9, and back and forth through these eyes is laced a conductor i0. One end of this conductor is anchored as at ll while the other end passes through a bushing ii in the frame I.
- the conductor I is located at the lower side of a sheet I! of Cellophane or some other inflammable material. while under this sheet is located a conductor wire ll which is disposed back and forth in the manner substantially shown in Figure in a direction transverse to the flights of the conductor It.
- the conductor i4 is an- Divided and this application July 14,
- to the conductors i4 and I0, respectively, extend to one part of a signal or warning circuit, or a circuit of some other character.
- the switch will be used in most instances as a switch in a fire alarm circuit.
- this switch In the operation of this switch, it can be seen that should a fire occur in a room or elsewhere, where one of the switches is located, the fire will destroy the sheet [3 of the corresponding thermal switch 6, to the end that the conductor M will lower to engage conductor l0 and close a circuit or system so that an indicator or alarm will become efiective.
- a thermal switch unit comprising an open frame, means to attach the frame to an overhead support so as to mount the frame in a horizontal position, a conductor having a zig-zag bare end portion extended back and forth in spaced flights between and connected to opposed members of the frame at one of its ends and at the ends of the flights thereof to assume a taut horizontal position in the frame, an inflammable sheet of electrical insulating material disposed in the frame and resting on and covering said bare end portion of the conductor, a second conductor wire having a zig-zag bare end portion extended in spaced flights back and forth within the frame upon the inflammable sheet and with its flights transverse to the flights of the first-named conductor, the flights of the second-named conductor being unattached to the frame and free to lower by gravity and engage those of the first-named conductor for closing a circuit when the inflaminvention, what is mable sheet is destroyed by flire, and an insulator
Landscapes
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fire Alarms (AREA)
- Fire-Detection Mechanisms (AREA)
Description
June 12, 1945. w. HILL 2,378,080
THERMAL SWITCH Original Filed Feb. 24; 1943 2 Sheets-Sheet 1 I n l/en tor 6' J0 J/ I Walk/e7. H020 By 2mm June 12, 1945. w. HILL 2,378,080
THERMAL swITcH Original Filed Feb. 24, 1945 2 Sheets-Sheet 2 Inventor Wa/Zher HLZZ/ y Mad W E Patented June 12, 1945 UNITED STATES PATENT OFFICE 1943, Serial No. 494,750
1 Claim.
This invention relates to new and useful improvements in thermal switches for fire alarm systems and the like, the same being a division of my co-pending application Serial No. 476,935, filed-February 24, 1943, for Signal system.
The principal object of the present invention is to provide a thermal switch which will operate promptly upon submission to heat of a predetermined temperature, for the purpose of closing a signal system or circuits of other nature.
Another important object of the invention is to provide a thermal switch which can be manufactured in convenient useful units and which can be installed in homes and elsewhere by unskilled labor.
Other objects and advantages of the invention will become apparent to the reader of the following description.
In the drawings:
Figure 1 is a top plan view of the switch.
Figure 2 is an end elevational view.
Figure 3 is a transverse sectional view taken on the line 3-3 of Figure 1.
Figure 4 is a longitudinal sectional view through the device.
Figure 5 is a perspective view of a sheet of destructible material such as is employed in the switch.
Referring to the drawings wherein like nu merals designate like parts, it can be seen that numeral 6 generally refers to the thermal switch. Each of the switch units consists of a frame 1 which may be of any suitable material and each corner of this frame has a bracket 8 apertured to receive suitable securing elements for securing the thermal switch unit to the ceiling as shown in Figure 2.
At the inner side portions of opposed sides of the frame I are eyes 9, and back and forth through these eyes is laced a conductor i0. One end of this conductor is anchored as at ll while the other end passes through a bushing ii in the frame I.
The conductor I is located at the lower side of a sheet I! of Cellophane or some other inflammable material. while under this sheet is located a conductor wire ll which is disposed back and forth in the manner substantially shown in Figure in a direction transverse to the flights of the conductor It. The conductor i4 is an- Divided and this application July 14,
chored at one end as at l5, while its opposite end passes through the bushing i2.
The wires and 3| to the conductors i4 and I0, respectively, extend to one part of a signal or warning circuit, or a circuit of some other character.
Inasmuch as the sheet of material i3 is of fire destructible material, the switch will be used in most instances as a switch in a fire alarm circuit.
In the operation of this switch, it can be seen that should a fire occur in a room or elsewhere, where one of the switches is located, the fire will destroy the sheet [3 of the corresponding thermal switch 6, to the end that the conductor M will lower to engage conductor l0 and close a circuit or system so that an indicator or alarm will become efiective.
While the foregoing specification sets forth the invention in specific terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.
Having described the claimed as new is: v
A thermal switch unit comprising an open frame, means to attach the frame to an overhead support so as to mount the frame in a horizontal position, a conductor having a zig-zag bare end portion extended back and forth in spaced flights between and connected to opposed members of the frame at one of its ends and at the ends of the flights thereof to assume a taut horizontal position in the frame, an inflammable sheet of electrical insulating material disposed in the frame and resting on and covering said bare end portion of the conductor, a second conductor wire having a zig-zag bare end portion extended in spaced flights back and forth within the frame upon the inflammable sheet and with its flights transverse to the flights of the first-named conductor, the flights of the second-named conductor being unattached to the frame and free to lower by gravity and engage those of the first-named conductor for closing a circuit when the inflaminvention, what is mable sheet is destroyed by flire, and an insulator
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US494750A US2378080A (en) | 1943-02-24 | 1943-07-14 | Thermal switch |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US47693543A | 1943-02-24 | 1943-02-24 | |
US494750A US2378080A (en) | 1943-02-24 | 1943-07-14 | Thermal switch |
Publications (1)
Publication Number | Publication Date |
---|---|
US2378080A true US2378080A (en) | 1945-06-12 |
Family
ID=27045356
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US494750A Expired - Lifetime US2378080A (en) | 1943-02-24 | 1943-07-14 | Thermal switch |
Country Status (1)
Country | Link |
---|---|
US (1) | US2378080A (en) |
-
1943
- 1943-07-14 US US494750A patent/US2378080A/en not_active Expired - Lifetime
Similar Documents
Publication | Publication Date | Title |
---|---|---|
AT269256B (en) | Wiring system for electrical installations in buildings or the like. | |
BE752058A (en) | IONIZATION FIRE ALARM WITH INSULATION MONITORING | |
US2779842A (en) | Device to establish an electrical circuit | |
BR8102353A (en) | BLOCKING DEVICE BETWEEN TWO ELECTRIC APPLIANCES AWAY AND ELECTRICAL INSTALLATION THAT USES IT | |
US2378080A (en) | Thermal switch | |
SE7704199L (en) | INSTALLATION DEVICE FOR ELECTRICAL INSTALLATION APPLIANCES | |
US2774850A (en) | Fire detection conductors | |
US3046536A (en) | Automatic fire alarm energizing means | |
US2058288A (en) | Fire detecting signal system | |
US2755363A (en) | Fire alarm device | |
US1297945A (en) | Automatically-extinguishing electric-lighting system. | |
US2198410A (en) | Fire alarm | |
US2186112A (en) | Safety fuse device | |
US783141A (en) | Thermo-electric signal. | |
US2575883A (en) | Fire alarm | |
CH424911A (en) | Surface-mounted installation box with support element, base part and actuator for an electrical installation device | |
CN2192919Y (en) | Mercury waterproof siren | |
US870068A (en) | Fire-alarm. | |
ES335091A1 (en) | Electric resistance. (Machine-translation by Google Translate, not legally binding) | |
US1300134A (en) | Electric switch for fire-alarms. | |
GB1036777A (en) | Improvements in or relating to methods of and devices for mounting bare electrical resistance wires on an electrical insulating support, and heating apparatus resulting therefrom | |
US1605260A (en) | Automatic fire -alarm | |
US2642511A (en) | Thermal-sensitive actuator for fire alarms | |
US1357325A (en) | Thermostatic circuit-closer | |
CH456748A (en) | Magnetic toggle relay in an electrical switching, control or monitoring device |