US2058288A

US2058288A - Fire detecting signal system

Info

Publication number: US2058288A
Application number: US14334A
Authority: US
Inventors: Bamonte Giuseppe
Original assignee: Individual
Current assignee: Individual
Priority date: 1935-04-02
Filing date: 1935-04-02
Publication date: 1936-10-20
Anticipated expiration: 1953-10-20

Description

Oct. 20, 1936. e. BAMONTE FIRE DETECTING SIGNAL SYSTEM 2 Sheets-Sfieet l Filed April 2, 1935 ATTORNEY Oct. 20,1936. 3, BAMONTE 2,058,288

FIRE DETECTING SIGNAL SYSTEM Filed April 2, 1955 2 Sheets-Sheet 2 l 'l 8 W E 8 Giuseppe Bamome- BY Wyz5@% ATTOR N EY Patented Oct. 20, 1936 more!) STATES PATENT OFFICE 2 Claims.

This invention relates to signal equipment for the detection of fires and more particularly to devices adapted to function when subjected to abnormally high temperatures to close an electrio circuit by which .a fire alarm is sounded.

It is the primary object of my invention to provide a fire detecting device adapted for servicing in conjunction with a fire alarm system, which device will operate to close an electric cirlO cuit when abnormal heat is applied to same, such as resulting from fire.

A further object is to provide in a device of this character a thermal sensitive member of simple and economical construction, the formation of which facilitates its replacement within a fire detecting device.

Another object of my invention is to provide a fire detecting device which, after it has functioned to send in an alarm will display a conspicuous signal indicating that the device requires resetting.

The invention will be fully and comprehensively understood from a consideration of the following detailed description when read in connection with the accompanying drawings which form part of the application, with the understanding, however, that the improvement is capable of extended application and is not confined to the exact showing of the drawings nor to the precise construction described and, therefore, such changes and modifications may be made therein as do not aiiect the spirit of the invention nor exceed the scope thereof as expressed in the appended claims.

5 In the drawings:

Fig. 1 is a front elevational view of my fire detecting device with the cover thereof partly broken away.

Fig. 2 is a longitudinal sectional view taken on line 2--2 of Fig. 1.

Fig. 3 is a transverse sectional view taken on line 3--3 of Fig. 1.

Fig. 4 is a transverse sectional view taken on line 44 of Fig. 1.

Fig. 5 is a schematic diagram illustrating a typical installation involving the use of my fire detecting device; and

Fig. 6 is a detail view of the thermal sensitive member apart from my device.

Referring to the drawings for a more detailed description thereof, the numeral 1 indicates a sheet metal casing of U-shaped cross-section having opposed longitudinal flanges 8 on each side thereof. A cover 9 is aflixed to the casing I by having its longitudinal edges bent over on themselves to slidably engage on the flanges 8. Into the upper end of the casing l is secured an insulating block ID, a portion of which is cut away to form a recess for the support and housing of an electric switch ll, thereby forming 5 upstanding members I2 and [3. The member I2 .is bored out to receive an electric cable I4, the

conductor terminals of which are connected to the respective terminals of the switch II. The switch ll comprises angular contact members l5 10 which are supported on the block l0 and a contact bar I6 adapted to move into engagement with the members [5 to close the circuit The contact bar I6 is mounted on the slide rod l1 and insulated therefrom by the bushing I8. The 15 rod ll extends thru the member I 3, its projecting end being provided with a hook 19. The opposite end of the rod I1 is supported for sliding action in the bearing 20. A spring 2| surrounds the rod I1 and is so disposed as to urge the contact bar l6 into engagement with the contact members I5. 20

The portion of the casing 1 beyond the member I3 is provided for housing the thermal sensitive member or fusible link 22 and the signal means for indicating that the replacement of the link 22 is required. This signaling means comprises a signal plate 23 carried on a transverse shaft 24 so that the former may be swung into contact with the underside of the cover 9. The cover 9 at this area is perforated to form the grill 25 thru which the position of the signal plate 23 may be readily observed. A spring 26 bearing against the back of the casing 1 presses against the signal plate 23 to urge the latter against the cover 9. The shaft 24 is suitably journalled in the longitudinal sides of the casing I and has affixed to it a hooked pin 21 to project perpendicularly from same.

Reference is now directed to Fig. 6 showing a detailed view of the thermal sensitive member 22, sometimes known as a fusible link. The member 22 comprises a looped member 28, the projecting ends of which are disposed in parallelism with each other and a hooked member 29, the projecting portion of which is disposed between 45 the parallel portions of the member 28. The projecting portions of the

members

28 and 29 contact with each other and are soldered together, it being required however that the solder used be of a sufficiently low melting point to 50 function as hereinafter described. In use the ends of the member 22 are respectively engaged on the hook l9 and the pin 21, as shown in Fig. 2. With the member 22 thus installed, the signal plate 23 will be held in its rearmost posi- 55 tion against the pressure of spring 26, and the contact bar 15 will be held apart from the contacts I5 against the pressure of the spring 2|.

At the occurrence of a fire the fusible link 22 will be subjected to a temperature sufficient to cause the solder thereof to melt, thus permitting the

component parts

28 and 29 to separate from each other. In this fashion the hook I9 is released so that the spring 2| moves the contact bar l6 into contact with the members I5, thus closing the fire signal circuit. Simultaneous with this action the spring 26 moves the signal plate 23 into position against the grill 25 in that the pin 21 has been released.

Reference is now directed to Fig. 5 illustrating a typical installation of a fire alarm system incorporating my fire detecting device indicated by numeral 30. The fire detecting devices 30 may be installed in any desired number and are to be located for example on the ceiling or near the floor so as to be most vulnerable to the eifects of the abnormal temperature resulting from a fire. The various units 30 in a single room may be electrically connected in parallel with each other, the conductors from same being extended to the basement of the building. In an appropriate part of the building, preferably the basement, an annunciator 3| and a fire alarm bell 33 are installed. The fire alarm signal circuit receives its current from a battery 32 or other suitable source. The interconnecting wires are so arranged that when a fire occurs in any part of the building the alarm bell 32 will be sounded and the location of the fire will be indicated on the annunciator 3|.

What is claimed as new is:

l. A fire detecting device comprising a pair of contactors, a switch, a fusible link normally holding said switch open with respest to said con tacts, a spring attached to said link and adapted to close said switch when said link fuses, a signal plate pivotally mounted at one end and normally held out of view by said link, a spring for moving said signal plate to a visible position when the link fuses, a casing enclosing the mentioned mechanism and having a window, said signal plate normally extending to the rear of said casing away from said window and behind said link.

2. A fire detecting device comprising a pair of contactors, a switch, a fusible link normally holding said switch open with respect to said contacts, a spring adapted to close said switch when said link fuses, a signal plate pivotally mounted at one end and normally held out of view by said link, a spring for moving said signal plate to a visible position when the link fuses, a casing enclosing the mentioned mechanism and having a window, said signal plate normally extending to the rear of said casing away from said window and behind said link, a pin to which one end of said link is secured and on which said signal plate is mounted, said signal plate being bent rearwardly away from said pin.

GIUSEPPE BAMONTE.