US2411752A - Fire alarm contact device - Google Patents

Fire alarm contact device Download PDF

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Publication number
US2411752A
US2411752A US650061A US65006146A US2411752A US 2411752 A US2411752 A US 2411752A US 650061 A US650061 A US 650061A US 65006146 A US65006146 A US 65006146A US 2411752 A US2411752 A US 2411752A
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Prior art keywords
spring
contact
fire alarm
contact device
contacts
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Expired - Lifetime
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US650061A
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Padilla Dante
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00Thermally-actuated switches
    • H01H37/74Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
    • H01H37/76Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
    • H01H37/767Normally open

Definitions

  • This invention relates to improvements in fire alarms, and has particular reference to a contact mechanism therefor.
  • the principal object of this invention is to provide a plurality of contact devices which act as switches under certain conditions to close a circuit and cause an alarm, either visual or audible.
  • a further object of this invention is to produce a device of this character which is neat in appearance and therefore one which will not detract from the appearance of the room in which it is installed; also, a device which is economical to manufacture and easy to install.
  • a further object is to produce a device wherein the various parts are simple, mechanical units which will be positive in operation under all given conditions and therefore a device which cannot become inoperative.
  • a further object is to produce a device which may be attached to any ordinary signaling circuit without alteration in its construction or wiring arrangement.
  • a further object is to provide a device wherein a definite contact is positively assured through the digging action of the ends of the contact spring.
  • a further object is to provide means whereby the spring tension of the spring contact also serves to cause collapse of the fusible block.
  • Fig. 1 is a top plan view of one of my contacts.
  • Fig. 2 is a side elevation of Fig. 1.
  • Fig. 3 is a view similar to Fig. 1, with the top removed and showing the wiring diagram, and
  • Fig. l is a view similar to Fig. 3 showing the parts in position to cause an alarm.
  • Applicant has, therefore, devised a switch or contact device wherein a fusible metal block is positioned between a support and a contact spring in such a manner that the spring is kept from completing a circuit between the two contact connected to the alarm circuit.
  • a fusible metal block is positioned between a support and a contact spring in such a manner that the spring is kept from completing a circuit between the two contact connected to the alarm circuit.
  • the same upon the heating of the block to a predetermined temperature, the same will become soft and allow the 2 spring to move to a position to complete an alarm circuit, so that warning will be given after a predetermined temperature has been reached.
  • the numeral 5 designates the base of my device which is made of any non-conducting material
  • the numeral 6 designates the cover therefor.
  • the base and the cover are mounted at any convenient point by a screw 1.
  • a recess 4 in which is mounted a pair of spaced contacts 8 and 9.
  • the contact 8 is connected by a wire H to one side of an electrical circuit, while the contact 9 is connected by a wire [2 to an'audible signal l3, which signal is in turn connected by a wire M to the opposite side of the circuit.
  • a spring l8 which has a U-shaped portion I! and a pair of divergent arms 18 and 19, which arms underlie inclined surfaces 21 and 22 respectively formed by the cut away portion of the base 5.
  • a fusible block 23 is positioned in the base and serves to hold the spring 16 in the position of Fig. 3, and while in this position the spring is under tension, so that the arms I8 and I9 press against the inclined surfaces 2i and 22 respectively.
  • a switch for fire alarms comprising a pair of spaced, vertically arranged contacts, cam surfaces formed adjacent said contacts, a U-shaped spring having diverging arms engaging said cam surfaces, and a fusible block supporting said spring, whereby said arms engage said cam surfaces under tension and maintain said arms out of engagement with said contacts.

Description

m 2 R U 5 m 10 m G L W 0 "(L 4mm; 7!. m EM 2 2 H a L g D Q y 4 v. H B A Q F U FADKLLA FIRE ALARM CONTACT DEVICE Filed Feb. 25, 1946 New. 26 319 Patented Nov. 26, 1946 UNITED STATES PATENT OFFICE FIRE ALARM CONTACT DEVICE Dante Padilla, Vallejo, Calif.
Application February 25, 1946, Serial N 0. 650,061
2 Claims.
This invention relates to improvements in fire alarms, and has particular reference to a contact mechanism therefor.
The principal object of this invention is to provide a plurality of contact devices which act as switches under certain conditions to close a circuit and cause an alarm, either visual or audible.
A further object of this invention is to produce a device of this character which is neat in appearance and therefore one which will not detract from the appearance of the room in which it is installed; also, a device which is economical to manufacture and easy to install.
A further object is to produce a device wherein the various parts are simple, mechanical units which will be positive in operation under all given conditions and therefore a device which cannot become inoperative.
A further object is to produce a device which may be attached to any ordinary signaling circuit without alteration in its construction or wiring arrangement.
A further object is to provide a device wherein a definite contact is positively assured through the digging action of the ends of the contact spring.
A further object is to provide means whereby the spring tension of the spring contact also serves to cause collapse of the fusible block.
Other objects and advantages will be apparent during the course of the following description.
In the accompanying drawing forming a part of this specification and in which like numerals are employed to designate like parts throughout the same,
Fig. 1 is a top plan view of one of my contacts.
Fig. 2 is a side elevation of Fig. 1.
Fig. 3 is a view similar to Fig. 1, with the top removed and showing the wiring diagram, and
Fig. l is a view similar to Fig. 3 showing the parts in position to cause an alarm.
Many large fires are due to the fact that they are not discovered until they have gained considerable headway, and it would, therefore, be advantageous if an alarm were sounded at the time of the beginning of rise in heat within a given area.
Applicant has, therefore, devised a switch or contact device wherein a fusible metal block is positioned between a support and a contact spring in such a manner that the spring is kept from completing a circuit between the two contact connected to the alarm circuit. However, upon the heating of the block to a predetermined temperature, the same will become soft and allow the 2 spring to move to a position to complete an alarm circuit, so that warning will be given after a predetermined temperature has been reached.
In the accompanying drawing wherein for the purpose of illustration is shown a preferred e-. bodiment of my invention, the numeral 5 designates the base of my device which is made of any non-conducting material, and the numeral 6 designates the cover therefor.
The base and the cover are mounted at any convenient point by a screw 1.
Within the base 5 I provide a recess 4, in which is mounted a pair of spaced contacts 8 and 9. The contact 8 is connected by a wire H to one side of an electrical circuit, while the contact 9 is connected by a wire [2 to an'audible signal l3, which signal is in turn connected by a wire M to the opposite side of the circuit.
In order to complete the electrical circuit between the contacts 8 and 9 I provide a spring l8 which has a U-shaped portion I! and a pair of divergent arms 18 and 19, which arms underlie inclined surfaces 21 and 22 respectively formed by the cut away portion of the base 5.
A fusible block 23 is positioned in the base and serves to hold the spring 16 in the position of Fig. 3, and while in this position the spring is under tension, so that the arms I8 and I9 press against the inclined surfaces 2i and 22 respectively.
The result of this construction is that when a fire does occur the temperature of the room where my device is located will rise, and as soon as the same is high enough to melt the fusible block 23 the same will collapse, as shown in Fig. 4.
This collapse is assisted by the downward pressure of the spring, as the ends of the divergent arms [8 and I9 tend to cam along the inclined surfaces 21 and 22 respectively. It is unnecessary, therefore, for the fusible block to reach a point of actual melting but only to the point of softening.
As the spring l6 moves downwardly, the arms [8 and [9 will engage the contacts 8 and 9 respectively, and due to the tendency of spreading, these ends of the spring will dig into the contacts '8 and 9 and thus assure a very good electrical contact between the spring 16 and the contacts 8 and 9; thus the circuit will be completed and the alarm will be caused to function.
It will thus be seen that I have produced a device which will accomplish all of the objects above set forth.
It is to be understood that the form of my invention herewith shown and described is to be taken as a preferred example of the same and that various changes relative to the material, size, shape and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.
Having thus described my invention, I claim:
1. A switch for fire alarms, comprising a pair of spaced, vertically arranged contacts, cam surfaces formed adjacent said contacts, a U-shaped spring having diverging arms engaging said cam surfaces, and a fusible block supporting said spring, whereby said arms engage said cam surfaces under tension and maintain said arms out of engagement with said contacts.
DAN'IE PADILLA.
US650061A 1946-02-25 1946-02-25 Fire alarm contact device Expired - Lifetime US2411752A (en)

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Application Number Priority Date Filing Date Title
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2552331A (en) * 1947-09-08 1951-05-08 Anthony H Lamb Electric clock fire alarm
US2704840A (en) * 1951-04-28 1955-03-22 Morse Signal Devices Fire alarm system
US2955179A (en) * 1958-09-26 1960-10-04 Filtron Company Inc Control device
US3805257A (en) * 1972-05-11 1974-04-16 D Horowitz Combined fire and burglar alarm

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2552331A (en) * 1947-09-08 1951-05-08 Anthony H Lamb Electric clock fire alarm
US2704840A (en) * 1951-04-28 1955-03-22 Morse Signal Devices Fire alarm system
US2955179A (en) * 1958-09-26 1960-10-04 Filtron Company Inc Control device
US3805257A (en) * 1972-05-11 1974-04-16 D Horowitz Combined fire and burglar alarm

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