US1824933A - Thermostatic alarm - Google Patents

Description

Sept. 2.9, 1931. F. .1. scHoLTz THERMOSTATIC ALARM Filed Aug. 2v. 1929 2 Sheets-Sheet 1 atroz nu* Sept. 29, 1931. F. .1. scHoL-rz 1,824,933

THERMOSTATIC ALARM Filed Aug. 27, 1929 2 Sheets-sheet 2 ,I m ,m .MQ F \N\ m Z/ u ...A -A.. rl@ H f/ o l u mi W KN A N I6. si m\ QQ Wwf. M\\ F QN In wil Patented Sept. 29, 1931 FERDINAND J'. SCHOLTZ, 0F WATRTOWN, SOUTH DAKOTA THERMOSTATIC ALARM Application led August 27, 1829. Serial No. 388,791.

This invention relates to thermostatically actuated devices for sounding an alarm or giving a signal of any other character in case the temperature of aparticular object or at a particular point, rises above or sinks below a certain degree and the general object of the invention is to provide a simple, readily ad-Y justed device of this character which will not befliable to get out of order and which will indicate the maximum or minimum temperature to which the alarm has been set. A further object is to 'provide a device of this character which is very simply constructed and which includes a tem erature controlled hand movable across a ial and two contacts movable in the direction of movement of the hand to bring them nearer to or further from the hand, these ycontacts beingwithin thel casing enclosing the ther- 2J mostat and moving over graduations which are-corelated with the fthermometric graduations on the dial.

Other 'objects are to eliminate the possibility of the indicator or hand becoming loose on its stud or shaft and the Vcorrosion or rusting or the collection of dust around said shaft or to eliminate the possibility of the adjusting nut becoming loose, ythus causing inaccuracy in adjusting the temperature.

Another object is to provide pivoted contacts disposed in the path of movement'of the indicator hand, these contacts being connected in circuit with the alarm by wires leading from the pivot points of the contacts, thus preventing any possibility of the wires becoming broken through more or less constant adjustment.

Another object is to provide a construc- 19 tion which eliminates the necessity of removing any part of the cover or casing of the dej vice in order to adjust the contacts.

Other objects will appear in the course of the following description.

My invention is illustrated in the accompanying drawings, wherein Figure 1 is a front elevation `of a thermo.

static alarm constructed in accordance with my invention and shown 1n use w1th a transformer and a signal;

Figure 2 is a side elevation of the thermostatic alarm;

Figure 3 is a face view of the alarm with the outer cover removed;

Figure 4 is a section on the line 4 4 of 5: Figure 3;

Figure 5 is a detailed view of the connectin member 22. j

eferring to the drawings, 10 designates the'peripheral casing of temperature con- G0 trolled element constituting in eilect a thermometer, this casing being formed with an outer face 11 having a slot 12 through which thegraduations 13 on a dial back of the outer face may be read, these graduae( tions being shown as Fahrenheit graduations. f

Thecasing is preferably formed in two sections, the back section being designated 14. The peripheral walls of these two sections are formed with slots 15 for purposes to be later stated.

Riveted or otherwise attached to the back `Wall 14 of the casing is a plate 17 of fibre or other insulating composition having a central opening. Extending through this opening is the shank of a rivet 18, this rivet having a fiange 19 so that this ibre plate 17 is embraced between the ange'and the head of the rivet. The rivet has attached to it the coiled portion 8o 20 of a temperature controlled or thermo-operated element 21 constituting a hand or y pointer which moves over the graduations 13 and which is observable through the glass pane disposed within the slot or opening 12. This thermometric element is formed of a leaf spring and the expansion and contraction of this temperature controlled element operates to shift the hand from one end of the scale or graduations 13 to the other end there- 90 of. The rivet is. tubular and having engagement with this tubular rivet by a screw is a lug 22 projecting radially outward and connected by a wire 23 to a binding post 24 in the peripheral Wall of the casing. Disposed through the peripheral wall of the casing, which casing is of metal, is a binding post 25. Pivotally mounted by means of rivets 26 to the back 'section 14 are metallic arms 27, these arms being alike, the outer ends of the 10o arms extendingjoutward through the slots 15, While the inner ends 'of the arms form contacts 28 disposed in the path of movement of the spring 21. These arms may have frictional contact with the Walls of the slots or be otherwise formed sothat the arms can be shifted in one direction or the other and Will hold rmly in their shifted positions.

The front of the casing is provided on each side ofthe middle with a graduated scale 29 graduated in degrees and correlated with the raduations 13, these contact arms being adgustable in yaccordance with these scales 29.

' For instance when va contact arm is moved so that it is opposite the graduations indieating ten degrees on the scale 29, the arm vvill have its Contact 28 shifted-over to a point signature.

FERDINAND J. SCI-IOLTZ.

tion of the case,

where a rise of ten degrees in temperature l I will cause the spring pointer 21 to contact with the arm and sound the signal or the arm might be shifted to a point Where it may require a movement of the spring ointer 21 to 110 degrees on scale 13 before t is change is made.

As shown in Figure 1, the binding post 24 is connected by a conductor 30 to a signal 31 and thence to a source of current While the binding post 25 is connected by a conductor 32 to the source of current. These Wires may pass through a transformer ifQ for instance, one hundred .and ten volt A. (.1. current is to be used in this signal circuit or the current may be secured from a battery, in which case, of course, no transformer is necessary.

Obviously minor details might be changed without departing from the spirit of the invention, but I regard the particular mounting of the spring pointer 21 as being of importance.

It will be noted that the arms' 27 are each grounded by the rivet 26 which grounds this arm to the metallic casing, thus forming a connection to the return wire connected to -bindmg post 25. It will thus be seen that movement of either one of these arms 27 will not in any Way affect any wiring and will not tend to break or bend any Wires. By this means also, I practically do away with all interior wiring except the Wire 23 which does not move and is, therefore, not liable to become detached or break.

I claim In a thermostatic alarm of the character described, a casing having a metallic section,

an insulating base mounted upon the metallic section, a rivet passing through said insulating base, a thermometric element in the form of a spring having one end coiled and engaged with said rivet, the other end formed to provide'a pointer, the case having a graduated scale over which the pointer moves, a lug carried by the rivet, binding post mounted upon the casing and insulated therefrom to which said lug isxelectrically. connected and contact arms each pivoted to* a metallic por-

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