US1926218A - Ignztek and control device fos - Google Patents

Description

Sept. 12, 1933; w. s. VALMORE 1,926,218

IGNITER AND CONTROL DEVICE FOR OVENS v Filed April 8; 1930 s Shee'lis-Sheet 1 Sept 12, 1933. w. s. VALMORE 1,926,218

IGNI'I'ER AND CONTROL DEVICE FOR OVENS Filed April 8, 1950 3 Sheets-Sheet 3 Patented Sept. 12, 1933 UNITED IGNHTEIR AND @ON'EROL DEVIIDE 170E, @VENS This invention relates to an automatic igniter and control device for use with gas fired ovens and is of general application. although the embodiment of the invention herein disclosed is particularly adapted for use in connection with the oven of a gas range.

One of the objects of the invention is to provide an automatic igniter and safety control device whereby the oven may be automatically m turned on and off in accordance with predetermined conditions.

- A further object of the invention is to provide a safety control device of the character described which is dependable and efficient in operation and which comprises comparatively few parts which can be readily assembled and disassem bled.

Another object of the invention is to provide a safety control device of the character described which is adapted for use in connection with a time clock whereby the clock may be set to turn on the oven burner and ignite the same and after the burner has been in operation for a predetermined period of time, to cut off the supply of 5 gas and to extinguish the burner.

Further and more limited objects of the invention will appear as the description proceeds and by reference to the accompanying drawings in which Fig. 1 is a fragmentary top plan view with certain parts broken away to more clearly illustrate the details of construction and disclosing my safety control device attached to a gas range; Fig. 2 is a fragmentary view partly in plan and partly in horizontal section illustrating certain details of construction andthe manner of securing and arranging the various parts in place; Fig. 3 is a detail view partly in elevation and partly in section illustrating several conduits for controlling the supply of fuel to the several burners; Fig. 4 is a fragmentary view partly in side elevation and partly in section illustrating the thermostat control burner and the valve for controlling the flow of fuel thereto; and Fig. 5 is a fragmentary view partly in vertical section and partly in side elevation illustrating the conduit for delivering fuel to the pilot burner.

Referring now to the drawings the reference character 1 designates a gas range of any conventional form having an oven 2 in which is arranged an oven burner 3 having a supply conduit 4 leading outwardly through the side wall of the oven and provided with a suitable air mixer 5. The range is also provided with the usual cooking top 6 having top burners 7 and 8 thereon. Disposed along the front of the stove is a gas supply pipe or conduit 9 from which lead branches 10 and 11 supplying fuel to the burners 7 and 8. The supply of gas to the burners 7 and 8 is controlled by manually operable valves 12 and 13 in a manner well known to those skilled so in the art.

Leading from the fuel supply pipe 9 is a conduit 14 in which is arranged a valve 15 controlled by a handle 16. The conduit 14 is threadedly secured to a branch connection or union 1'? to which is secured a tube or nipple 18 which is adapted to deliver fuel into the oven burner supply conduit 4. Leading from the connection 17 is a tube or conduit 19 the opposite end of which is connected with a casing 20 in which is arranged a thermostat 21 one end of which is rigidly secured to the casing and the other end of which is connected with a rod 22 which is disposed within the conduit 19. Secured to the opposite end of the rod 22 is a valve member 23 adapted to engage a valve seat 24. 'Carried by the tube or conduit 19 and adjustably positioned thereon is a combination safety and pilot light burner 25 which is adjustably secured in place by means of a screw 26, as shown most clearlv in Fig. 2.

The safety and control burner really consists of two separate burners which are cast in one piece so as to facilitate production and reduce the cost of manufacture. This burner has a flame port 2'7 and a flame port 28. A tube or conduit 29 leads from the supply pipe 9 and connects with the burner 25 so that the flame port 28 is always in constant open communication with the supply of fuel and is adapted to burn continuously. Leading from the connection 17 is a tube or conduit 30 which leads from a point between the valve 23and the source of supply of fuel. The opposite end of the tube 30 connects with the burner 25 and delivers fuel to the flame port 2'7 in a manner to be hereinafter described. The flame port 2'7 is disposed at such an angle with respect to the casing 20 that the flame will impinge against the casing 20 and thus heat the thermostat 21. posed closely adjacent the flame port 28 so that the gas escaping from port 28 will be ignited therefrom. Arranged within the conduit 30. is a valve 31 having a valve operating lever. 32

which is adapted to be connected with a lever 33 forming part of a clock mechanism 34. The details of construction of the time clock forms no part of this invention and are therefore not'di'sclosed as such devices may be purchased in the open market. This clock is so arranged that it vThe flame port 27 isalso dis- 100 will actuate the lever 33 to open the valve 31 for a predetermined period of time and then close the valve. Leading from the conduit 31 at a point in advance of the flame port 27 is an igniter in the form of a perforated tube 35 the supply of gas to which is regulated by means of a regulating valve 36. The flow of fuel to the port 27 is regulated by means of a regulating valve 37. The tube 35 leads through'an opening provided in the side wall of the oven.

In Figs. 1 and 2 the parts are shown in the normal position with the valves 15 and 23 closed. Gas will be supplied to the burner port 28 through the supply pipe 9 and the conduit 29 and the gas issuing through this port will be ignited. In fact the burner 28 constitutes a pilot light which is normally burning. Should the housewife desire to leave the premises and set the range so that the oven burner will be automatically turned on and ignite at say 3 oclock and burn until 4 o'clock and then turn off, the valve 15 will be turned on or opened so as to permit gas to flow therethrough. The time clock 34 will be set so that the lever 33 will be actuated at 3 oclock to open the valve 31 whereupon gas will be delivered to the burner 25 and the flame port 27 and will become ignited from the pilot flame issuing from the port 28. After this burner has been burning for a slight period, the thermostat 20 will become heated and tend to uncoil or expand and move the valve 23 from its seat thus permitting gas to flow through the connection 17 and tube 18 to the conduit 4 and the oven burner 3. Gas will also flow from the conduit 30 through the tube 35 and become ignited from the flame issuing from the port 27. It will therefore be seen that as soon as gas is supplied to the burner 3 it will become ignited from the flame jets issuing from the ports in the tube jet 35; The burner will continue in operation until the clock actuates the lever 33 to close the valve 31 thus cutting off the supply of gas through the conduit 30 whereupon the flame issuing from the port 27 will become extinguished. The thermostat will thus be no longer heated and will cool and contract and close the valve 23 thus cutting oil the supply of gas to the oven burner 3. It will also be seen that my improved control device serves also as a safety device for cutting off the supply of fuel to the burner should the thermostat control burner for any reason become extinguished. In order for the oven burner to remain in operation, it is'necessary that the burner 27 be also in operation. Should it be Bil desired to use the device without the time clock, the valve 31 may be manually opened and disconnected from the time clock whereupon the stove may be operated in the usual manner.

Various changes may be made in the details of construction as well as in the shape or size and manner of securing and arranging the various parts in place without departing from the spirit of my invention. The embodiment of the invention herein disclosed is therefore merely illustrative and is not to be considered in a limiting sense and is intended to be limited only in accordance with the scope of the appended claims.

Having thus described my invention, what I claim is:

1. In a control device of the character described, the combination of an oven and a burner therefor, a fuel supply pipe for said oven burner, a valve in said supply pipe, a thermostat located outside of the oven and operatively connected with said valve, a constantly burning pilot burner, an auxiliary burner disposed outside of the oven and adjacent said thermostat so as to heat the same to open said valve and positioned to be lighted from said pilot burner, said thermostat being responsive only to the heat of said auxiliary burner, an igniter positioned so as to be ignited from said auxiliary burner and operable to ignite said oven burner, and means for supplying fuel to said auxiliary burner and igniter.

2. In a control device of the character described, the combination of an oven and a burner therefor, a fuel supply pipe for said oven burner, a valve in said supply pipe, a thermostat operatively connected with said valve, a constantly burning pilot burner, an auxiliary bumer disposed adjacent said thermostat so as to heat the same to open said valve and positioned so as to be lighted from said pilot burner, said thermostat being responsive only to the heat of said auxiliary burner, an igniter positioned to be ignited from said auxiliary burner and operable to ignite said oven burner, and means for supplying fuel to said auxiliary burner and igniter, said pilot burner and auxiliary burner being positioned outside of the oven and said igniter extending into the oven.

3. In a control device of the character described, the combination of an oven and a bumer therefor, a fuel supply pipe for said oven burner, a valve in said supply pipe, a thermostat operatively connected with said valve, a constantly burning pilot burner, an auxiliary burner disposed outside of the oven and adjacent said thermostat so as to heat the same to open said valve and positioned so as to be lighted from said pilot burner, said thermostat being disposed outside of the oven and responsive only to the heat of said auxiliary burner, an igniter positioned so as to'be ignited from said auxiliary burner and operable to ignite said oven burner, means for supplying fuel to said auxiliary bumer and igniter, and clock controlled means for controlling the flow of fuel to said auxiliary bumer andigniter.

WM. s. VALMORE.

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