US930972A - Thermostatic circuit-controller. - Google Patents

Description

W. H KIRNAN. THEEMOSTATH} CIRCUIT CONTROLLER.

APPLICATION FILED PC6117, 1909.

936,972. r I r Patented Aug. 10, 1909.

UNITED STATES ILLIAM H. KIRNAN, or BAYONNE, NEwiER'sEYf TrmRMos'rA'rIo' cIRoUI'r-ooN'r oLLERQ origi -a1 application filed November 7, 1908, Serial lac-[461,452. Dividedand.

l 1909. Serial No. 478,347.

all whom it-mat concern." I Be it known that I, "ILLIAM H. K'IR- xax, a citizen ofthe United States, residing at Bayonne; count-y ofgHudson, State of New Jersey, have invented certain new and useful Improvements in Thermostatic Circuit-Controllers; of which the following is in the condition of the "circuit.

thereby.

It further has for its ob ect tofprovide a thermostatic controller with a semaphore so as to indicate whether or not the thermostat has been actuated so as to ary the circuit, and consists of the featur'hereinafter v described and re ferred to in the claims;

The following isa description of apparatus embodying my invention, reference being had to the accompanying drawing, which shows in perspectlye a thermostat circuit controller together with a circuit controlled Referrlng more'particularly to thedraw- "ings, and 2 are two members'ofa thermo- 4 stat consist-mg preferably of zinc ,or steel and hard rubber strips, connected at the top and supported by a bracket 3 vand having their lower ends connected together.

- by reason of gravity'but preferably have The members so connected constitute athermostat ic couple and actuate a toothed mem-, her 4. Upon tlns toothed member are two 'pawls 5 and J6 pivotally .1nounted'in insuQ lating hearings in a yoke 7. This yoke is pivotally supported'at S and has a slot at its lowerend .throug-hflwhich' passes a screw 9,1sothat the yoke may be adjusted clrcum- I ferentially about the :j'pivotal support 8 The pawls 5 and 6 act quickly and positively j spring extensions 10Yandj1l which are-en;

gaged by adjusting'screws 12 and .13, so as to tend to' keep the forward ends of the pawls in engagement with thetoothed memberi-t, and render the action. still quicker.

One of the pawls hasfan adjustable contact screw 14 the lower ofg-wliich engages 1 I Specification of Letters Patent.

Patented Aug-.10, 1e09,

cumstances hereinafter described,

The two pawls 5 and 6 and the rack j a 'fe so proportioned and located relatively to one 1 another that'the pawls are out of step, that pawls 5and '6 esc apefrom theteeth H with which they engage atdiiferenttimes. Hien the pawl fiengages the first tooth, as shown in Fig. 1, the parts areso'related that as the escapefrom its tooth first. This causes the contact 14 toengage the pawl (Sand form an electrical connection between the two paw ls' so as to vary the conditioii of an electric cirpawls 51nd (3. After thepawl 5has escaped -the first tooth of the rack 4 and so long 'as the pawlfti is still engaging the 'third tooth,

pawls. If the rack l is moved still farther to the right, the "first action will be for the tween the contact 14 and the pawl t3. the pawl 5 being supported by the secbnd tooth. As the toothed member 4 moves still farther .to the right, so that-the pawl .5 escapes the second tooth, the electrical engagement between the two pawls is made again and is broken when the pawl 6 escapes thefourt-h tooth.

further repeatedupona v further niovenient of thefpawls acts asa" detentto"pr ei'enttl1e toothed member from moving to the le ft. The pawls when once in engagement, remain in engagement until the pawlti eseap tooth, howsoever the toothed ;1nember move by. reason of varying degrees of t noedanger of having the electrical "en'gagebroken, except upon a predetermined ,teini perature change in one direction. Tl1e "pi\'- otal'ad ustn'ient of the yoke? 'pei'mits i-the rack fit to bexaried. Thus, as the =yok e 1.

merit of the pawl (3, and their: relation to the rack 4 and also tlie degreet'o whicht ey areout of step can thus be modified. i

this application filed February' 17,

the pawl 6 supports the pawl 5 and there] is Q an electrlcal engagement between the two I pawl 6 to escape from the third tooth, thereby breaking the electrical engagement beof the rack 4 to the right. idvhenever the electrical engagement is made or broken one t. perature oraccident 'lhere is pract cally ment between the pawlsfiand 6 mad c jand moved in either direction, the.1norenient of the pawl 5 would be different from the move withthe lower pawl 6 under certain 'ciris, so that when the rack 4 is moved, the g toothed member 4 moves, the pawl 5 will cuit whose branches are connected to the vThe makingand breaking operation will be :relativerelations of the pawls 5 and 6. tothe The rack 4 carries a projection lG, which, when the rack moves so as to disengage the pawl 5 from the first tooth, comes over a "notch 17 in the arm 18 of a semaphore 19, permitting the semaphore to swing on its pivot 20 and therebyindicate that the thermostat corresponding thereto has been actuated so as to move its rack into the second position.

Where the toothed member 4 is made of conductingmaterial, the parts of the pawls 5 and 6 bearing thereon should preferably be made of insulating material, as shown in the drawing, so that their engagement with the toothed member 4 will not establish an electrical connection between their conducting energizethe magnet 21 when the resistance is in circuit. Whemhowever, the pawls 5 and 6 arein electrical engagement, the resistance 25 is short-circuited thereby and the battery 24 then energizes the magnet 21. Other thermostats having pawls 5 and 6 can be connected at various stations, such as 28 and 29, if desired, so that the magnet 21 will be operated by whichever thermostatic controller may be in abnormal'condition.

It will be seen from the foregoing that the controller is on'ewhich is positive in its actionand which will not permit accidental making or breaking of electrical engagement due to jar, vibration or other causes so as to send in undesired signals. It will positively both close and open the circuit through the magnet 21 fongiven degrees of temperature varying in one direction only.

The, rack 4, t gether with the pawls 5 and 6 adapted to engage said rack and each other, constitutes a quick positively acting switch, controlling the terminals of the circuit of the battery ated by a movement of the thermostat in one direction but not by a movement in the other direction, and wheneverso actuated produces a plurality of alternate makes and breaks upon apredetermined movement of the thermostat, so that for successive degrees of temperature the circuit is made and broken. Thus with the arrangement shown, the circuit can be made three times as the temperature increases. It is not, however, affected by a decrease in temperature. The quick action eliminates the danger of a Sneaking'forfalse contact, and assures a .positive and permanent contact when a given temperature is attained- My n'iventlon permits of Various modifica 24. The switch is actu-' tions without departing from the spirit thereof, and I do not limit it to the particle lar embodiment shown in the drawings.

' This ap lication is a division of my ap-. vplication er. No. 461,452 filed November 7, 1908f What I claim is: 1. The combination of switch locked against movement in one direction, circuit terminals controlled thereby,

a quick acting,

terminals, movable means for electrically connecting and disconnecting said terminals,

and a thermostatic couple acting to move said means positively to vary the electrical connections between said terminals only during an increase in temperature.

3. The combination of a thermostat, a ciricuit having contacts connected therewith,

and means controlled by said thermostat'for electrically connecting said contacts upon a given movement of said thermostat, and a semaphore released by saidthermostat when moved from its normal position.

4. In an electric system, the combination of a thermostat having a plurality of abnormal positions under various abnormal.

conditions, circuit contacts actuated thereby when in a plurality of said positions, and a semaphore released by said thermostat when in the first abnormal position.

5. In an electric system, the combination of a thermostat, a member carrying teethlike projections moved by said thermostat, two pawls engaging teeth on said member, the relations of one pawl with its tooth differing from the relations of the other pawl with its tooth, said pawls having contact surfaces adapted to be electrically connected and disconnected by the'movements of said pawls. 4 I

'6. In an electric system, the-combination of a thermostatic couple, a member carrying teeth-like projections moved by said thermo-' static couple, two pawls engaging teeth on said member, the relations of one pawl with itstooth differing. from the relations of the other pawl with its tooth, and circuit contacts carried by said pawls and brought into engagement and disengagement by the movement of said member. I 7. In an electric-system, the combination of a thermostat, a member carrying teethlike projections adapted to. be moved by said thermostat, a. plurality of pawls engaging" said teeth and out of step with one another as said member moves, and a con; tact-carr ed 'by one of said. pawls and. en

- gaging the other when one pawl leaves a tooth on saidmember, and being disengaged when the other pawl leaves a tooth on said member. y

8. In an electric system, the combination of a thermostat, a toothed rack, two pawl's engaging teeth on said rack and located so as to be out of step with one another as the rack is moved longitudinally relatively to said pawls, said thermostat being adapted toc'ause a relative longitudinal movement betweensald rack and pawls said paw'ls hav-' ing contact surfaces adapted to be electric"- ally connected and disconnected by the movements of said pawls',

9. In an electric system, the combination of a thermostat, a toothed rack moved thereby, two pawls engaging teeth on said rack and located so as to be out of step with one another as the rack is moved, an angularly adjustable member carrying said pawls, the connections of said pawls with said memberbeing out of line with one another and at least one of them out of line with the axis of adjustment of said member said pawls having contact surfaces adapted to be electrically connectedv and disconnected by the movements of said pawls. I I: 10. In an electric system, the combination of a thermostat, a toothed rack moved thereby, two pawls engaging teeth on said rack ,and located so as to be out of step with one another as the rack is moved, an angularly adjustable member to which said p'awls are pivoted, the axes of saidpawls being out of line with one another said pawls having contact surfaces adapted to be. electrically connected and disconnected. by the move-' H. B. BRoWNnnL, M. E. GARRE'rr.

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