US1458168A - Oven thermometer - Google Patents

Description

Jim@ l2, 1923.

G. J. 'DAY OVEN THERMOMETER Filed Aug. `19, i921 WHO rney-s;

Patented .lune l2, 1923.

Utl TT GEORGE J. DAY, OF BUFFALO, NEW YORK.

OVEN THERMMETER.

Application filed .August 19, 1921. Serial No. 493,768.

To all whom it may concern Be it known that I, GEORGE J. Dar, a citizen of the United States, residing at Bualo,

in the county of Erie and State of New` lts chief object is the provision of a detachable thermometer of this character capable of being readily applied to and removed from ordinary or existing oven doors, without in any way altering their construction.

Another object of the invention is to provide a removable thermometer which is simple and compact in construction and which can be manufactured at a low cost..

A. further object is to provide the thermometer with an improved pointer or indicator which is so mounted as to practically eliminate friction, thus insuring its free and reliable action under all conditions.

In the accompanying drawings:

Figure 1 is a front view of an oven showing one form of my improvement applied thereto. Figure 2 is a fragmentary horizontal section, on an enlarged scale, on line 2-2, Fig. 1. Figure 3 is an enlarged fragmentary vertical section on line 3 3, Fig. 1. Figure 4 is an enlarged fragmentary rear view of the oven door showing the thermometer in position thereon. Figure 5 is a perspective view of the thermometer. Figure 6 is an enlarged sectional elevation ofthe dial plate and its pointer 'or indicator-hand. Figure is a perspective View of a modified form of theimprovement. Figure 8 is a rear view of a different style of oven door, equipped with said modified form of thermometer.

Similar characters of reference indicate corresponding parts throughout the several views. y l

In the embodiment ofthe invention shown in Figs. 1-6, the thermometer is shown as applied to a portable oven 10 of well-known constructionvhaving a swinging door 11 providedfwith a transparent vpanel or window pane.v 12 of glass or other appropriate material. The pane is confined in the usual groove or channel, which in the example illustrated in the drawings, is formed between the frame ofthe door and the flanged or rabbeted back-strips 13 suitably secured t'o the inner side of said frame, as shown in Figs. 2, 3 and 4.

Detachably mounted on the inner side of the oven door and in one corner thereof, is the improved thermometer which preferably comprises a rectangular base or bodyv portion 1'4 of sheetvmetal or other appropriate material having suitable ears, flanges or projections 15, 16 at adjacent upright and horizontal edges thereof, adapted to beinserted between the flanged back-strips 13 and the rear side of the window pane, whereby the base is reliably held in place on the door but at the same time removable therefrom. As sh'own in Figs. 2, 3 and 5, these fianges, which are preferably'formed integrally with said base, are raised or offset forwardly therefrom and substantially parallel to the plane thereof, so as to space the base sufficiently from the back of the window pane to receive the remaining elements of the thermometer. v For this purpose, the fianges 15 and 16 are connected with the base by webs 15a, 16a., arranged substantially at right angles to the base.

17 indicates the dial or indicator plate of the thermometer suitably secured to the front side of the base 14 and bearing on its face a substantially semi-circular graduated temperature scale18 which is traversed by a hand or pointer 19. In the preferred construction shown, the dial plate is held against vertical dis lacement by retaining lips 20,21 forme on the base and bent around the upper and lower edges of the dial plate. Horizontal displacement ofthe latter is prevented by the web 15a at one edge of the base and by a forwardly bent re taining flange 22 at its opposite edge.

, Any suitablethermal means may be employed for controlling the movement of the pointer 19, but as shown in the drawings, particularly1 Figs. 2, 3 and 6, these means preferably comprise a forwardly extending post or arbor 23 rigidly secured to the dial plate at the axis of the scale, and a spiral or volute thermost-atic element 24 fastened at its inner end to said post, and carrying the pointer at its free outer' end to which the pointer is suitably secured. rlhis thermostatic element which is constructed of any suitable thermostatic material, enpandsvand contracts in response to varia-tions in tein-` vperature, moving the pointer over the dial in one direction or the other. To protect land conceal the spring, aeover or guard plate 25 may extend' over the front sidethereof, said guard preferably projecting inwardly from the retaining'flange 22. if

desired, the front end of' the vpost 23 may Guard-plate and be upsetl pass through said on the outer side thereof, as shown inl Fig. 2,' to brace;v and stiften the post?. Clearance is provided on both sides ofthe' spiral. spring to permit its free expansion and contraction4 Without friction in response to variations in temperature. y

By vthisv constructionA and arrangement of the thermal spring and the. pointer, bearings and otherv friction-producing parts are eliminate-d,y thus rendering the thermometer' very accurate and sensitive to thermal changes. Furthermore, the' construction is exceedingly" simple and there are no partswvhich arer AWith vgrease or otherwise attaching i'anges areV comparatively thin and the, flanges off'said bacl'estrips are fieXible or resilient', the thermometer can be fric-A tionally interlocked with the door in Ythis manner Without difiicnlty. The thermometer can be as readily remo-ved'by simply- Wijthdrawing its attaching flanges 'from the i corner of the door, in an obvious manner.

In the modification of the improvement shown in Figs. 7 and 8", the base 26 is provided at either side'i'vith 'upright attaching flanges E27 and at its bottom 'with a horizontal attaching' flange 28. This form oi the invention 'is designed more particularly for a: door of the' type shown in Fig. 8', hav

ing on,` its 'inner side ay pluralityof Windows or transparent panels 29 confinedv in sub-v stantially U-shaped guidey frames 30. nr

applying this modified form. of the improvement to ajdoorroff this character, the thermometer is yinsertedi'n the Vopen upper end of one ofthe guide-frames on the inside ofthe door and' foreedto. the lower end thereof, the upright attachingjflanges 27; engagi'ngf` under t, the upright portion-s of" said giiilde'frame and' the horizontal.' attaching flange under the base portion yof' said frame t It Will' be noted that inasmuch as the embodiinont of the invention shown/in Figs. 1 5, is provided at'tWo adjacent sides Vor edgesl With corner-attaching flanges, itis applicable to a door ofthe type illustrated in Fig. 8, as Well* as to; the style of door shown in Fig. I.

The removable character of the ther1nom. y f eter not only perm-its its ready application to existing oven doorsoi various kinds, but also enables it to kbe removed for cleaning its dial from time totime. f

1 claimf as my invention: 'i `1. A detachable thermometerfor an oven door having auwindoiv pane', said thermometer comprising av base having means mounted thereon for indicatingtemperaturem the( base having a marginali attaching portion conystr-notedl to enter between thelvvindovv pane.

2. A detachable,thermometer for' an oven door having a Window pane, said thermomes.

and the frame of the` oven door. A l

ter comprising a base liaving'means mounted thereon for indicating temperatures, the'V base having an attaching lflange arranged.- at,

its edgefor engagement 'with the oven door, said flange being oiiset forwardly froml said base and substantially paralleli to. the pla-ne thereof. f l

.y 3. A detachable thermometer fior an oven: door having a Window pane', saidthermometer comprising a ysubstanti-ally rectangular base having means mounted thereon fory in-y dicating'temperatures,-the base hav-ing marginal attaching fianges projecting from dif.`

ferent edges thereof and'arranged togen; gage corresponding' sides f of' the oven-door groove which receives said pane'.

4.' A detachable thermometer for anoven: y

door having a Window militie,'saidA thermometer comprising a vsubstantially rectangular base having means mounted thereon for iin-- dicating temperatures, the base' hav-infgup right and horizontal attaching flanges arranged at adjacent edges tliereof,l sardi franges being "offset forwardlyl from said' base and substantially parallel f to the plfane thereof 'andi adapted tio-enter between-the Window pane-'andthe frame of the. oven door. v Y

5. A detachablethermometer tor an oven door having a Winde-W pane, said? ther-momee baseV having means mon-nte )thereon for dicatingtempeiatures,`the bafsefh-av' 1 ginal attaching flanges projecting?r from-dir'-v ferent edges thereof and arranged substantially parallel to thepl'ane' of said base. andi Webs connecting saids Ianges ywith the hase and arranged substantially at right'angfles to the base, 'saidfianges-being 'adapted to enter between the Windovv-pane and the frame ofthe oven-door. n 6". The combination .with oven door having af Window-pane and' retaining means therefor, of a removable-t'hermometer' arranged on thel rear side of said door and having attaching meansinserted between the said' Window-pane and saidl retain-ing means. f f I V 7. The combination With'an oven door having l a window-pane and a retaining groove therefor, of a detachable thermometer arran 'ed on the rear side of said door 5 and inclu ing a. base having a marginal attaching flange inserted between said Windowpane and the rear Wall of said retaining groove.

8. An oven thermometer, comprising a 10 base provided on its face with a non-rotary forwardly-projecting post and with a dial having a curved temperature-scale arranged concentrically with said post, a volute thermostatio element arranged on the outer, dialside of said base and having its inner eentral portion fastened to said post, and a pointer fastened to the free outer end of said thermostatic element and traversing said dial.

GEORGE J. DAY.

Certificate of Correction. v It is hereby certified that in Letters Patent No. 1,458,168, granted June 12, 1923,

' upon the application of George J. Day, of Buffalo, New York, for an improvement in Oven Thermometers, errors appear in the printed specification requiring correction as follows: Page 2, lines 4 and 17, for the Word spring read @Ze/ment, and line 12, for the Words spiral spring read thermostatzc element; and that the said. Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 17th day of July, A. D., 1923.

[SEAL] WM. A. KINNAN,

` I y ,-l v Acting yommvlssioner of Patents.

Images