US1273644A

US1273644A - Thermo-controlled gas-oven.

Info

Publication number: US1273644A
Application number: US7992816A
Authority: US
Inventors: Benjamin E Meacham
Original assignee: American Stove Co
Current assignee: American Stove Co
Priority date: 1916-02-23
Filing date: 1916-02-23
Publication date: 1918-07-23
Anticipated expiration: 1935-07-23

Description

B. E. MEACHAM.

THERMO CNTROLLED GAS OVEN.

APPLlcAlou men ma. 23. lele.

1 ,273,644. Patented J |115r 23, 1918` 2 SHEETS-SHEET I.

www

B. E. MEACHAM.

HEHMo CONTROLLED GAS ovEN.

APPLICATION flLED FEB.23. |916,

Patented July 23, 1918.

2 SHEE TS-SHEET 2.

BENJAMIN E. MEAOHAM, 0F LORAIN, OHIO 0F ST. `LOUIS, MISSOURI, A. G

sssIeNoa To Ansmann TovE courait?, oar-cannon or New maaar.

THERMO-CONTROLLED GAS-OVEN.

To all whom t may concern.'

Be it known that I, BENJAMIN E. MEACHAM, a citizen of the United States, residing at Lorain, in the county of Lorain and State of Ohio, have invented certain new and useful Improvements in Thermo- Controlled Gas-Ovens, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to improvements in thermo-controlled gas-ovens, and the object of the invention is to so arran e and locate the parts of the thermo-regu ating means as to immediately subject it to the iniiuence of a lowered temperature in the oven occasioned by the openingy of the oven door, whereby an immediate and increased flow of gas isfobtained to restabIish yand maintain a uniform temperature throughout the oven chamber.

This invention pertains to that class of gas ovens in which the heat within the oven 1s controlled by a thermo-actuated gas valve, for the purpose of maintaining a desired predetermined heat within the oven cham- .ber, and the desired predetermined heat capable of being adjusted tosuit the varying conditions of cooking different kinds of In thermo-regulated ovens heretofore known to me, the wthermo-regulating means is so located that there is a great lag in the effect thereof by reason of a cooling or low- Jering of the tem erature in the oven due to the opening of the oven door, and therefore a delay and lag in the increase of the gas How bythe thermo-regulated means to reestablish and maintain a uniform predetermined temperaturegwithin the oven chamber. y i E f In thermo-actuated devices, there-is a lag in their o eration in response to either the rising nor owering of the temperature, because of the time required, im the first instance, to bring the temperature of the therino-device' up to the increased temperature, and due, in the second instance, to the time required to cool the theme-regulated de vice in` the lowering temperature, and this may be aptl referred to as the lag 1u the operation of' theI thermo-actuated device. By reason of this-"fact, thehun-controlled gas-ovens heretofore known to nie, have not quickly responded to the changes in the temperature of the oven chamber, which I Specioatton ot Letters Patent.

Application led February 23, 1916. Serial No.

-in the cool zone of the oven Patented July 23, 191s. 79,928.

have discovered is due largely, if not wholly, to the location of the thermo-actuated devices in the oven chamber.

I overcome this objection in thermo-controlled ovens, heretofore known to me, by so placing the thermo-actuated member that it 1s Within the zone of the cool ortion of the oven caused by the opening o the oven door, and by reason of this, it is subjected to the cool air zone and, therefore, quickly responds to the lowered temperature within the oven, and correspondingly quickly increases the flow of gas to restablish and maintain` a uniform pre-determined heat within the oven chamber.

That portion of the oven chamber which is at the loven door opening and is usually the front end of the oven chamber, is the coolest zone of the chamber, due to the opening o'f the/oven door, and for the purposes of this improvement will be referred to as the cool zone of the oven chamber. This portion of the oven chamber, I nd to be the cool zone thereof when it is first being heatgreatest within the chamber immediately at or adjacent 4the door opening.

My present improvement 1s to make the thermo-device immediately 4 subject Vto the lowering of the temperature by the opening of the door and to raise the cool part of the chamber w en first heating up the oven, to the desired predetermined heat by placing the thermo-actuated member wit in t e oven just above the door opening whereby 1t 41s for the purpose of maintaining a uniform heat throughout the oven, and for the purpose of restab-- lishing a predetermined heat in the oven after 1t is cooled by the opening of the oven door.

I have discovered that when the tempera- -ture at the-center of the ovenand back of and where the door-opening is located, will not be at the same temperature as the center and back portion of the oven, and the thermo-actuated member be ins to cut off the gas before there is a uni orni predetermined temperature throughout the oven. I have also discovered that when the thermo-actuated device is located at about the center of the oven, or back of that point, the tempera-ture at said oint is not sufficiently lowered by the ordinary openin of the oven door to examine the food to bring the thermo-member quickly' under the infiuence of the change of temperature and, therefore, does not quickly respond to turn on the gas `to quickly reestablish the desired predetermined temperature in the oven.

I have also discovered that by placing the thermo-actuated chamber in the front, or door end of the oven, which is its cool zone, it will notbegin to turn olf thegas until the temperature throughout the chamber has been raised to the desired uniform degree and it will quickly respond to a lowering o the temperature due to the opening of the oven door and, therefore, quickly increase the flow ofy gas and quickly reestablish and maintain the desired predetermined temperature in the oven.

In the 'accompanying drawing;

Figure 1 is a perspective view of a gas oven constructed with my improvement.

Fig'. 2 is a front' elevation, partially in section. v

Fig. 3 is a sectional view on the line 3 3 of Fig.. 2, and also partiallyin section.

In carry" out my invention, the usual is provided and this casing ovenA casini.o i has at its nt end the usual oven door 2.

Located in the bottom of the oven is the burner tube 3 communicating with any desired form of burner 4, which burner is only diagrammatically indicated by dotted lines. Located outside of the oven is a housing 5, in which is locateda thermo-actuated lever 6. y The lower end of this lever 6 `is o` eryatively connected with a needle-valve to control the amount of s flowing into the burner in tube 3. E?)

catedV at the upper end of the housing 5 is a fulcrlim 8 for the upper -end of the lever v6 anda thermo-actuated memberl.) engages the lever 6 between itsA fulcrum- 8 and the gas valve 7. This thermo-actuated member or'irod 9 is of the well-known construction' and 4,is not here shown-in detail and isnot necessary `for .the

understan of my present improvement. .As shown in ig. 1, the housing 5 is located at the f nt edge of the oven and the therymo-aetu ted member 9 is in the front end of the oven, and as here shown, extends regulating the evice to be actua at the desired temperatureby .means ofa suitable hand wheel 1i, and this hand wheel 11 is held at its adjusted position by means of a suitable latch 12. Since this forms no part of my present invention, further description here is unnecessary.

For the purpose yof preventing the gas from being completely cut olf by the action of the thermo-member 9, upon the lever 6, I provide a stop-screw 13, which will be set to let just enough gas How to prevent the burner from bein completely or partially extinguished and t us letting the gas escape within the oven, or the burner poppin out or firing back and this is one of t e details of my present improvement which it l is desired to protect by this application.

As shown, the upper end o the housin 5 is in communication with the gas manifol 14, through the means of a' branch pipe 15, in which 1s located a valve 16 forcompletely cutting oif the s to the housing 5.

Owing to the ocation and arrangement of the thermo-actuated member here shown, it is located in the cool zone of the baking chamber when it is being rst heated up to prevent cutting of of the as until the comlete chamber is uniform y heated to the esired predetermined temerature, and it is so located that it is uic y influenced by the cool air'entering t e chamber when the door is apen and, therefore, qhuickly increasing the ow of gas to restab 'sh and maintain within th@ oven chamber the desired predetermined temperature, and it obviates the lag in the operation'of the thermo-control heretofore existin and it obviates the lag in maintaining t e desired predetermined uniform heat in the oven chamber in the constructions heretofore used so far as known to me.

` Having thus described, my invention, what Lclaim and desire to secure by Letters Pat- `ent is:

. 1. A as stove having cooking burners, an`

.oven a ousing communicatingwith the s supply for the cooking burners burners or the oven, the gas supply for the said oven burners communicatlng'with the housinglae y heating the oven, a' fuel valve forthe burner, therein just above the door opemng 10. Thefu1crum 8 is ad'ustable for thel pose of a thermo-actuated member operatively connected14 with, the fuel valve and exten across thev oven in a direction parallel wi the oven door opening and thereby wholly located in the cool Zone of the oven adjacent the door opening to be quickly aifeeted hy the cooling of the oven to turn on the gas and quickly reestablish and maintain the desired predetermined temperature Within the oven chamber.

3. A gas stove having cooking burners, :in oven, a housing connnunicating with the gas supply for the cooking burners, a burner for the oven, the gas supply for the said burner communicating with the housing, a fuel valve for the oven burner, a thermo actuated member extending into the oven, a lever operatively connecting the thermomember with the fuel valve, and means for limiting the closing movement of the lever and therefore the closing movement of the fuel valve for the purpose described.

4. A gas stove having cooking burners, un oven, a housing communicating with the gas supply for the cooking burners, :1, burner for the oven, the gas supply for the said oven, the gas supply .for the said burner communicating with the housing, a lever within the housing, a fuel valve within the housing and connected to one end of the said lever. a thermo-actuated member extending through the housing engaging the said lever and also extending into the cool zone of the oven for the purpose described.

5. A gas stove having cooking burners, an oven, :t housing communicating with the gas supply for the cooking burners, burners for the oven, the gas supply for the said oven burners communicating with the housing, a valve in said housing for controlling the said gas supply to the oven burners, and a thermo actuated member, extending Within the oven and operatively associated with said valve for controlling it.

In testimony whereof I hereunto affix my signature in the presence of two witnesses.

BENJAMIN E. MEACHAM.

W'itnesses:

GEO. L. GLI'rScH, JOHN J. GLUVNA- Copies or this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C.