US1263190A - Thermostatic circuit-closer. - Google Patents

Description

A. l. BENNETTr THERMOSTAHC CIRCUIT CLOSER.

APPLICATION FILED APR. 14, 1917.

1,263, 1 90 Patented Apr; 16, 1918;

2 SHEETS-SHEET 1- I] r o DI I'JJ Z14 4Z3 INVENTOR WITNESSES ATTORN EY A. l. BENNETT.

I THERMOSTATIC ClRCUlT CLOSER. APPLICATION man APR. 14. 1917. 1,263,190. Patented Apr. 16, 1918.

m x is N N m 2 SHEETSSHEET 2 N N Y k 1? R v INVENTOR WITNESSES v AJIBennett ATTORNEY ALBERT I. BENNETT, OF FORT ATKINSON, WISCONSIN.

THERMOSTATIC CIRCUIT-CLOSER.

Specification of Letters Patent.

Patented Apr. 16, 1918.

Application filed April 14, 1917. Serial No. 162,094=.

To all whom it may concern:

Be it known that I, ALBERT I. BENNETT, a citizen of the United States, residing at Fort Atkinson, in the county of Jefierson and State of Wisconsin, have invented new and useful Improvements in Thermostatic Circuit-Closers, of which the following is a specification.

My invention relates to electric automatic fire alarms and has for its objects; first, to provide an efficient electric alarm which is controlled by a sensitive thermostatic switch, which when the thermostat reaches a predetermined degree of heat closes a circuit and thereby actuates the alarm, second, to provide an efiicient automatic electric fire alarm system having a number of alarms and a number of switches whereby when any one of the switches is closed all of the alarms in the system are operated; and thirdly, to provide an electric alarm system having a number of switches and a number of alarms and an annunciator whereby, when one of the switches in the system is closed, all the alarms in the system are actuated and the annunciator is actuated to show which switch is closed.

I attain these objects by the mechanism illustrated in the accompanying drawings forming a part of this specification, in which Figure 1 is a top plan view of an alarm device embodying my invention,

Fig. 2 is a side elevation of the same in partial section,

Fig. 3 is a diagram of the wiring system of my invention.

Like characters of reference indicate like parts in the various views.

In the drawings 1 indicates the base of the alarm. Said base is metallic and is a conductor of electricity. Mounted on said base is a signal 2 of the electromagnetic type comprising electromagnetic elements 3, a vibrating arm 4 of metal and positioned to be actuated by said electromagnetic elements 3, a circuit breaker 5 in operable connection with said vibrating arm and adapted to hold the circuit closed when said arm is in its distant position relative to said electromagnetic elements, and to open the circuit when said arm is in its closed position respecting said electromagnetic elements 3, and a spring pivot 6 for holding said vibrating arm away from said electromagnetic elements, said circuit breaker being in circuit with said electromagnetic elements 3 whereby when said signal is energized the vibrating arm is moved to and fro. An extension arm 7 of said vibrating arm 4 has a knocker 8 at its upper end and is positioned relative to a gong 9 fixedly mounted on said base 1 and insulated therefrom so that it strikes the gong as said arm 4 moves to and fro as hereinbefore described. The electromagnetic elements 3 are mounted upon a frame 10. The spring pivot 6 is also mounted on said frame, said vibrating arm 4, spring pivot 6, frame 10, and base 1 being in metallic contact. A stationary contact 11 of the circuit breaker 5 is mounted upon an extension of frame 10 and is insulated therefrom, said contact being in operable relation with extension 12 of vibrating arm 4. An insulated electric conductor 13 leads from stationary contact 11 to one end of the contactor in the electromagnetic elements 3. Thus one conductor of the circuit to the electromagnetic elements 3 is composed of conductor 13, contact 11, extension 12, vibrating arm 4, frame 10, and base 1. A. binding post 14 is mounted upon base 1 in metallic connection therewith for convenient connection with an electric circuit. An insulated conductor 15 is in electrical connection with the other end of the conductor of electromagnetic elements 3 and leads down underneath the base 1 through a convenient hole therein. A dust cover 16 is mounted on base 1 in a usual manner and has an opening therein to allow arm 7 to operate therethrcugh. The above described electric signal is of usual construction and needs no further description for the present purposes, except to say that when it is in circuit with an electric energizer the arm 4 vibrates to and fro thereby causing knocker 8 to strike gong 9.

A thermostat 17 of usual construction having a contact 18 on its upper surface and a stud 19 projecting from its lower surface is mounted upon base 1 by means of stud l9 and a nut 20 screw threaded thereon. Insulating washers 21 prevent said stud and nut from contacting with said base. An electric conductor 22 has one end confined between the lower washer 21 and nut 20 and is in electric connection with said nut, and said conductor 22 is connected with a binding post 23 mounted upon base 1 and inis formed thereon and positioned in the path of contact 18-of said thermostat. Said contact bar and thermostat witht-heir appurtenant parts form a thermally operated switch which closes .when the thermostat reaches ,a predetermined degree of heat. A stud 29 is mounted on said base 1 and insulated therefrom by insulating washers 30, nuts 31 screw threaded upon said stud confining said base between said washers. Said stud extends upwardly through a hole 32 of contact 'bar 27 located near the free end thereof.

"-A supporting nut 33 is screw threaded upon stud 29 and engages the bottom side of said contact bar. thus supporting one end of the same. A spiral compression spring 35 encircles said stud and bears down upon bar 27 and a pair of washers 34 engages with {the ends of the spring. A nut 36 screw threaded upon said stud engages the other end of said spring and compresses the same. A pointer 37 ofcontact bar 27 extends from the free end of the same. A standard 38 is mounted upon said base 1 by means of nuts 39 screw threaded thereon engaging insulating washers 40 and confining said base between them. Said standard 38 has a scale 41 inscribed thereon in proximity to the pointer 37 whereby it is possible to adf just said contact bar 27 by means of supporting nut 33 so that the contact l8 of 'thermostat 17 will contact the contact point "28 at acertain temperature. By reason of the spring engagement to hold down said contacting bar 27 the thermostat cannot be injured if the temperature were to rise to such a point that contact 18 would move beyond contact point 28. In such an event said contact pushes the contact bar against the spring 35 and raises thesame, no injury being done upon the thermostat thereby.

The conductor 15 is confined between the lower nut 31 and washer 30 and is in metallic contact with stud 29. An electric conductor 42 has one of its ends confined between lower nut 31 and washer 30 and is in electrical contact with said stud 29. A binding post 43 is mounted upon base 1 and is insulated therefrom. The other end of conductor 42 is in electrical contact with said binding post for convenient connection with an electrical circuit for purposes hereinafter described.

An electric battery 44 is provided and is .of usual constructionhaving a feed wire 45 leading from one pole thereof and a return wire 46 leading from the other pole thereof. SeeFig. 3.

It will benoted that the terms feed wire and return wire are used merely to the different wires and do not designate the direction of the flow of the currenttherethrough. Said feed wire leads from said battery to an annunciator of usual construction and having anannunciating'device for each signal inthe system. Each annunciating device consists of an electromagnetic element 48 in operable relation with a pivot arm 49, and having a spring 50 holding said pivot arm normally in a distant position from said electromagnetic element and against a ings 52 are placed in the side of the annunciator casing, there being one for each annunciating device. These sight openings are positioned respecting outer ends of said pivoted arms so that said ends are in registry with their corresponding sight openings when the pivoted arms are in close relation with said magnetic elements whereby it can be determined which alarm circuit is closed. Branches 54 of said feed wire lead to .one end of the electric conductor of each magnetic element 48 of the annunciator. The wires 53 lead from the other ends of .each of said electric conductors of said magnetic elements and are connected to the binding post 23 and are thus in electrical connection with the thermostats 17 as hereinbefore described. Return wires 46' lead from said battery to the binding post 14 of each signal. A wire 55 is connected to the binding post 43 of each signal. 8 l

When the system is installedinabuilding signals are placed at intervals-throughout the building. The annunciator is placed at a convenient position therein. 9'

In the operation of the device the circuits are normally opened and no current flows therethrough. However, if the temperature around one of the signals rises so that the thermostat moves contact 18 into contact with contact point 28 the circuit for that signal is closed and current flows therethrough actuating'the alarm and the annunciator as hereinbefore described. The closing of said circuit alarm closes a circuit by which each of the other alarms in the system is actuated. This second circuit flows through feed wire 45 through the same contactor as the first mentioned circuit to the stud-29 where it branches and by means of conductors 42 and binding posts 43 and the wire 55 flows to each of'the signalsin the system actuating the same and returning over the respective return wires 46. The alarm is given over the whole building and by means of the annunciator it can be determined from a contact point just what switch is closed.

Having thus fully described my invention, I claim:

1. A device of the class described comprising a base, a thermostat thereon, a pair of studs on said base, a contact bar havmg one end pivoted to one stud and its other end engaging the second stud, a nut on said second stud for adjusting the position of the bar in relation to the thermostat, a coil spring on said second stud engaging with the bar, and a nut on the stud for ad usting the tension of the spring, said thermostat and contact bar being included in an electrical circuit.

2. A device of the class described comprising a base, a thermostat located thereon, a pair of studs, a contact bar having one end pivoted to one stud and its other end provided with a hole which engages the second stud, said bar having a downwardly projecting contact point arranged in the path of said thermostat, a nut on the said second stud located below the bar for adjusting the copies of this patent my be obtained for position of the same in respect to the thermostat, a coil spring on the second stud engaging with the upper face of the bar, and a nut on the stud for adjusting the tension of said spring, said thermostat and contact bar being included in an electrical circuit.

3. A device of the class described comprising a casin a thermostat mounted thereon, a pair 0 studs on said base, a contact bar pivoted to one of said studs and having a contact point arranged in the path of said thermostat, the other end of said bar being bent downwardly, and having its end extending horizontally and provided with an opening to engage the second stud, a nut on said second stud for adjusting the position of the bar in relation to the thermostat, a coil spring on said stud engaging with the upper face of the bar and a standard adjacent the extreme end of the bar and pro vided with indicating marks, said thermostat and contact bar being included in an electrical circuit.

In testimony whereof I afiix my signature.

ALBERT I. BENNETT.

five cents each, by addressing the commissioner of 2mm. Washington, D. G.

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