US3753256A

US3753256A - Fire alarm system

Info

Publication number: US3753256A
Application number: US00176726A
Authority: US
Inventors: G Mcdonald
Original assignee: Lee Raymond Organization Inc
Current assignee: Lee Raymond Organization Inc
Priority date: 1971-08-31
Filing date: 1971-08-31
Publication date: 1973-08-14
Anticipated expiration: 1990-08-14

Abstract

A portable battery powered fire alarm device employing a bellows charged with a substance which causes expansion of the bellows. This expansion actuates a battery powered alarm.

Description

Unitw States Patent 11 1 McDonald Aug. 14, 1973 [54] FTRE ALARM SYSTEM 3,470,341 9/1969 Beddoe ZOO/83.31 X 2,471,838 5/1949 Ross 1 200/83 C [75] Inventor: Grover Knoxv'ue' 2,757,361 7/1956 Cameron 1 200/83 c Tenn- 2,697,766 12/1954 Goldmuntz 337/117 X [73] Assignee: The Raymond Lee Organization,

Inc., New York, N.Y. Primary ExaminerJohn W. Caldwell [22] Flled' 1971 Assistant ExaminerWilliam M. Wannisky [21] Appl. No.: 176,726 Att0rneyTheodore Jay, Esq.

Related U.S. Application Data [63] Continuation of Ser. No. 831,537, June 9, 1969,

abandoned.

- [57] ABSTRACT [52] U.S. Cl IMO/227.1, 200/83 R, 337/117 {51] Int. Cl G08b 21/00, HOlh 25/32 [58] Field 01 seal-e11 337/1 17; 200/83 c, A POrtable batery Powered fire alarm dev'ce 3 N. 2 7 2 111g a bellows charged With a substance WhlCh causes y expansion of the bellows. This expansion actuates a [56] References Cited battery powered alarm.

UNITED STATES PATENTS 1,187,334 6/1916 Keppler 340 2271 1 Claim, 5 Drawing Figures Patented Aug. 14,- 1973 3,753,256

INVENTOR. GROVE/E C. M DONAL D FIRE ALARM SYSTEM CROSS REFERENCES TO RELATED APPLICATIONS This is a continuation of application Ser. No. 831,537 filed 06/09/69 now abandoned.

SUMMARY OF THE INVENTION My bellows is hollow and is filled with a mixture of alcohol and water which will cause the bellows to expand at a selected temperature, the temperature depending upon the relative proportions of the two fluids. A normally open switch connected in circuit with batteries and an alarm such as a bell is closed by this expansion and actuates the alarm.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings: FIG. 1 is a side view of my invention;

FIG. 2 is a cross sectional view thereof;

FIG. 3 is an enlarged detail view of the bellows; FIG. 4 is a detail view of parts of the invention; and FIG. 5 is a circuit diagram of my invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS Referring now to FIGS. 1-5, a hollow bellows arranged vertically in a guide 12 has its bottom end welded or otherwise secured to the guide and its upper end free to move extends through an opening into the bottom end of a vertical hollow chamber 14. A removable side mounted plug 16 in the bellows permits the bellows to be filled with any mixture of alcohol and water whereby the bellows will expand at any selected temperature from 178 F to 210 F depending upon the relative proportions of alcohol and water. The bellows has a plunger 30 at its top end adjacent a plunger actuated switch 20. Normally the plunger is spaced from the switch which is then open. When the bellows expands, plunger 30 moves into contact with the switch and closes same.

Switch 18 has one lead 22 connected in series with batteries 24 to one side of a buzzer or bell 26. Switch 18 has another lead 28 connected to the other side of the bell. When the switch is closed, the'leads 22 and 28 are connected together to complete the circuit'and actuate the bell to sound the alarm. The switch, batteries,

lead and armature of the bell are disposed within the container with the remainder of the bell extending outside.

Flash light or transistor batteries can be used. While I have described my invention with particular reference to the drawings, such is not to be considered aslimiting its actual scope.

I claim:

1. A portable, battery powered fire alarm device comprising:

a. a hollow chamber defining a casement for the alarm device;

b. a guide extending through one wall of the chamber and into communication with the interior of the chamber;

0. a hollow bellows mounted within the guide, said bellows having:

1. a stationary end secured to the guide,

2. another end free to move within the guide and into communication with the interior of the chamber;

3. a liquid within the bellows which liquid being ca pable of extending the free end of the ballows along the guide and into communication with the interior of the chamber as a result of the volumetric expansion of the liquid itself at a predetermined temperature, said liquid being a mixture of alcohol and water and 4. a side mounted plug which permits the addition of any mixture of alcohol and water to the system;-

d. a plunger mounted integrally with the free end of the bellows; I

e. a normally open pressure sensitive switch disposed within the interior of the chamber. and in a normally spaced alignment with the plunger; and

f. an electrically actuated alarm connected in circuit with the switch, said alarm being actuated when the switch is closed;

Whereby upon the volumetric expansion of the liquid at the predetermined temperature, the free end of the bellows is expanded and carries the plunger into direct contact with the switch, said contact resulting in the closing of the switch and the consequent actuation of the alami.

Claims

1. A portable, battery powered fire alarm device comprising: A. A HOLLOW CHAMBER DEFINING A CASEMENT FOR THE ALARM DEVICE; B. A GUIDE EXTENDING THROUGH ONE WALL OF THE CHAMBER AND INTO COMMUNICATION WITH THE INTERIOR OF THE CHAMBER; C. A HOLLOW BELLOWS MOUNTED WITHIN THE GUIDE, SAID BELLOWS HAVING:

1. A STATIONARY END SECURED TO THE GUIDE,

3. A LIQUID WITHIN THE BELLOWS WHICH LIQUID BEING CAPABLE OF EXTENDING THE FREE END OF THE BALLOWS ALONG THE GUIDE AND INTO COMMUNICATION WITH THE INTERIOR OF THE CHAMBER AS A RESULT OF THE VOLUMETRIC EXPANSION OF THE LIQUID ITSELF AT A PREDETERMINED TEMPERATURE, SAID LIQUID BEING A MIXTURE OF ALCOHOL AND WATER; AND

4. A SIDE MOUNTED PLUG WHICH PERMITS THE ADDITION OF ANY MIXTURE OF ALCOHOL AND WATER TO THE SYSTEM; D. A PLUNGER MOUNTED INTEGRALLY WITH THE FREE END OF THE BELLOWS; E. A NORMALLY OPEN PRESSURE SENSITIVE SWITCH DISPOSED WITHIN THE INTERIOR OF THE CHAMBER AND IN A NORMALLY SPACED ALIGNMENT WITH THE PLUNGER; AND F. AN ELECTRICALLY ACTUATED ALARM CONNECTED IN CIRCUIT WITH THE SWITCH, SAID ALARM BEING ACTUATED WHEN THE SWITCH IS CLOSED; Whereby upon the volumetric expansion of the liquid at the predetermined temperature, the free end of the bellows is expanded and carries the plunger into direct contact with the switch, said contact resulting in the closing of the switch and the consequent actuation of the alarm.