US3169519A

US3169519A - Liquid fuel burners

Info

Publication number: US3169519A
Authority: US
Publication date: 1965-02-16
Anticipated expiration: 1982-02-16

Description

Feb 16, 1965 BUNJl AlzAwA ETAL LIQUID FUEL BuRNERs Filed April 19, 196s w J9 19a J8 INVENTOR. Bunj Aizawa QP NOBUHIKO KATAGIRI United States Patent O 3,169,519 LIQUID FUEL BURNERS Bunji Aizarva and Notauhiko Katagiri, Kaum-shi, Japan, assignors to Toshiba Denki Kigu Kabushilri Kalsha,

Tokyo-t0, Japan, a joint-stock company of Japan Filed Apr. 19, 1963, Ser. No. 274,073 Chinas priority, application Japan, Dec. 17, 1962, 37/55,3St; Jan. 19, 1963, 38/ 1,518 Claims. (Cl. 126-96) This invention relates to liquid fuel burners and more particularly to an improved liquid fuel burner provided with a flame cylinder disposed above a wick, wherein a flame extinguishing plate is mounted in the upper portion of the flame cylinder and is adapted to direct toward the ame burning on said wick, when the entire burner assembly is accidentally tilted or overturned, a blast of wind which reverses its direction.

With the recent development of various types of kerosene stoves including the so-called Wick lifting and lowering type wherein the wick isV immersed in a body of kerosene to feed it to the combustion section by utilizing the capillary action of the wick and the so-called liquid head type wherein the fuel is fed to the wick by gravity from a fuel reservoir positioned above the wick, it has been desired to provide an effective ame extinguishing device which can promptly extinguish the wick llame so as to prevent dangerous lires caused by the fuel flooding into the body ofthe burneror scattering on the floor to come into direct contact with the llame on the wick or the red hot llame cylinder when the liquid fuel burner is accidentally tilted or overturned on the oor.

Heretofore a safety device for liquid fuel burners wherein for example, a` cover is caused to beat and extinguish the ame directly has been proposed, but in this arrangement, if a small gap remains between thek coverl and the Wick, or if the flame extinguishing cover is overheated after long operation, the fuel may be reignited after it has once been extinguished.

It is therefore the principal object of this invention to provide an improved flame extinguishing means for such liquid fuel burners.

In one embodiment of this invention, a llame extinguishing plate is mounted in the flame cylinder which is placed over the wick of a liquid fuel burner, said flame extinguishing plate being so constructed that, when the liquid fuel burner is tilted, it produces a blast of air the direction of which is alternately reversed by oscillation of the flame extinguishing plate.

In accordance with the preferred embodiment of this invention, said llame extinguishing plate is swung by means of a spring in the direction to direct a blast of air toward the flame when a catch associated therewith is released by a latching member which, in the normal state, holds said spring in the energized or charged state. To get more effective extinguishment of the flame, it is desirable to use a plate of resilient member or a rigid plate supported by a spring member. In this manner a strong downward and reverse blast of air can be generated. The said latching member is released by actuation through a push rod connected to a connecting lever 'frranged to be rotated when the liquid fuel burner is tilted or overturned. Thus, the llame extinguishing plate constructed in accordance with this invention operates Very quickly to positively extinguish the wick llame when the burner is tilted or upset.

In addition there is no possibility of reignition after extinguishing since the llame extinguishing plate itself is not brought into contact with the combustion section of the burner even when the temperature of the plate "lee The features of the invention which are believed to be novel are set forth with particularity in the appended claims. The invention itself, however, as to its organization together with further objects and advantages thereof, may best be understood by reference to the following description taken in connection with the accompanying drawing, in which FIG. 1 shows a vertical section of oneembodiment of this invention in the normal condition;

FIG. 2 shows the same vertical section of the liquid fuel burner shown in FIG. 1 when it is tilted; and

FIG. 3 is an enlarged perspective view of certain essential parts of the fuel burner shown in FIGS. 1 and 2.

Referring now to the accompanying drawing illustrating the invention as applied to .a wick lifting Vtype single cylinder kerosene stove, there is provided on the bottom surface of a liquid fuel reservoir 2 an upwardly extending cylindrical wick guide 1 surrounded by a wick 3. Around the wick 3 is provided a burner basket 5 having a cylindrical metal wire net 4. A burner cap 6 is placed over the burner basket 5, which supports a flame cylinder 7. A horizontal shaft 8 is rotatably journalled in a depression provided in the upper portion of the side wall of the llame cylinder 7, and a thin elliptic flame extinguishing plate 9 is mounted on the shaft S. The plate 9 is either resilient as illustrated in FIGS. 1 and 2 or is mounted on the shaft S by means of a spring 21 as illustrated in FIG. 3. The shaft 8 is normally biased in the counterclockwise direction, as viewed in FIG. 3

by a coil spring 10. Secured to the shaft 8 is a cam shaped catch member 11 with its ,projection normally engaging one end of a latching member 12 pivoted on a pivot 13 so as to normally hold the coil spring 10 in its energized or charged State. Opposite to the flat portion 14 at the other end of the latching member 12 is disposed the upper end 16 of a push rod 15 which is arranged to be moved in the vertical direction in parallel with the side surface of the flame cylinder 7. The lower end of the push rod 15 is connected to a connecting lever 17 which is disposed horizontally below the bottom surface of the fuel reservoir 2. The connecting lever 17 is pivoted on a pin 17a substantially at its middle portion and is biased in the counterclockwise direction around the pin 17a by means of a spring 18 having its one end connected to the pin 17a and the other end to the connecting lever 17. The opposite end of the connecting lever 17 is bent at right angle .to extend toward the oor surface through a small opening 19a provided through a platform 19. While the llame extinguishing plate 9 is shown as being mounted on the shaft 8 through a spring plate 21, it may be directly mounted on the shaft if so desired. A knob 22 is secured on one end of the shaft 8 for manual rotation thereof.

The operation of the flame extinguishing Vdevice of this invention will be described hereunder by referring to FIGS. 1 and 2. When the liquid fuel burner is in the normal vertical position as shown in FIG. 1, the lower end of the bent portion of the connecting lever 17 directly rests on the oor to urge the rod in the clockwise direction against the action of the spring 18, thereby to pull down-the push rod 15 and to hold the push member 16 at its upper end separate from the cooperation portion 14 of the latching member 12. Therefore, the other end 12a of the latching member 12 continues to engage the projection of the catch member 8 to hold the llame extinguishing plate 9 in its inoperative position A, as shown in FIG. 1, against the force of the spring 10 thus permitting normal burning condition for the burner to continue. However, when the burner is accidentally tilted or overturned, as shown in FIG. 2, the spring 18 causes the connecting lever 17 to rotate in the counterclockwise direction around the pin 17a so as to raise the push rod 15 to disengage the latching member 12 from the catch member 11. Thereupon, the ame extinguishing plate 9 is rotated to the position C, FIG. 2, by the force stored in the spring 10, around the shaft 8. Then the plate springs back to the position B and then again is brought to the position C by the resiliency of the llame extinguishing plate 9 itself. air which automatically reverses its direction is produced. Thus, more particularly, as the flame extinguishing plate 9 is rotated from the position A to the position Ca downward blast of air is directed to the flame burning on the top periphery of the wick 3 while a large quantity of cool air is caused to flow across said top periphery through the cylindrical metal wire net 4 by quick swinging motion of plate 9 from the position C to the position B. This quick swinging motion of plate 9 is caused by the resilient properties of the construction of the iame extinguishing plate, and a further downward blast is again supplied to the ilame when the plate returns to the position C thus assuring quick and positive ame extinguishment. In order to reset the plate 9 to the original state, the shaft 8 is rotated bymanipulating the knob 22 until the catch member 11 is arrested by the latching member 12 as shown in FIG. 3. Thus, the spring 10 is recharged and the apparatus is restored to the condition of FIG. 1.

In accordance with the provisions of the patent statutes, we have explained the principle and operation of this invention and have illustrated and described what we consider to represent the best embodiment thereof. However, we desire to have it understood that Within the scope of the appended claims, the invention may be practiced otherwise than as specifically illustrated and described.

What is claimed is:

1. A liquid fuel burner comprising a wick and a flame cylinder disposed above said wick, which comprises a flame extinguishing plate which is pivotally mounted in the upper portion of said ame cylinder, spring means adapted to force said extinguishing plate to quicklyswing about its pivot to direct a blast of wind toward the ame In this manner, a blast of` burning on said wick, a latching-mechanism which normally holds said spring means in the energized condition, a push rod associated with said latching mechanism so as to release said mechanism with said rod is pushed, and a connecting lever means which is rotated when said liquid fuel burner is tilted and is connected to said push rod so as to push said rod to release said latching mechanism when said lever means is rotated.

2. A liquid fuel burner according to claim l, in which the arne extinguishing plate is made of a resilient member.

3. A liquid fuel burner according to claim 1, in which the ame extinguishing plate consists of a rigid plate member and a spring member supporting said plate member.

4. A liquid fuel burner according to claim 1, in which the ilame extinguishing plate is secured to a shaft which is journalled on the side of the flame cylinder and the spring means is of coil spring form adapted to cause said shaft to rotate.

5. A liquid fuel burner according to claim l, in which the push rod is arranged to move in the vertical direction in parallel with the back surface of said llame cylinder, the lower end of said push rod is connected to one end of the connecting lever disposed horizontally beneath the bottom of a fuel reservoir, said connecting lever being pivoted on a pin at its middle portion and biased by means of a spring to rotate'to lower said push rod, and the other endof said connecting lever being bent downwardly to directly contact the oor surface.

References Cited by the Examiner UNITED STATES PATENTS 252,098 1/82 Grannis 67-78 FOREIGN PATENTS 64,258 2/ 92 Germany. 80,439 7/ 94 Germany.

7,540 3 13 Great Britain.

JAMES W. WESTHAVER, Primary Examiner.

FREDERICK KETTERER, Examiner.

Claims

1. A LIQUID FUEL BURNER COMPRISING A WICK AND A FLAME CYLINDER DISPOSED ABOVE SAID WICK, WHICH COMPRISES A FLAME EXTINGUISHING PLATE WHICH IS PIVOTALLY MOUNTED IN THE UPPER PORTION OF SAID FLAME CYLINDER, SPRING MEANS ADAPTED TO FORCE SAID EXTINGUISHING PLATE TO QUICKLY SWING ABOUT ITS PIVOT TO DIRECT A BLAST OF WIND TOWARD THE FLAME BURNING ON SAID WICK, A LATCHING MECHANISM WHICH NORMALLY HOLDS SAID SPRING MEANS IN THE ENERGIZED CONDITION, A PUSH ROD ASSOCIATED WITH SAID LATCHING MECHANISM SO AS TO RELEASE SAID MECHANISM WITH SAID ROD IS PUSHED, AND A CONNECTING LEVER MEANS WHICH IS ROTATED WHEN SAID LIQUID FUEL BURNER IS TILTED AND IS CONNECTED TO SAID PUSH ROD SO AS TO PUSH SAID ROD TO RELEASE SAID LATCHING MECHANISM WHEN SAID LEVER MEANS IS ROTATED.