US2896704A

US2896704A - Electric igniting devices for gas stoves or the like

Info

Publication number: US2896704A
Authority: US
Publication date: 1959-07-28
Anticipated expiration: 1976-07-28

Description

H. ALEWELD July 28, 1959 ELECTRIC IGNITING DEVICES FOR GAS STOVES OR THE LIKE Filed Nov. 21,1955

v '3 Sheets Sheet 1 In van or:

July 28, 1959 H. ALEWELD V ELECTRIC IGNITING DEVICES FOR GAS STOVES OR THE LIKE Filed NOV. 21 1955 3 Sheets-Sheet 2 f I. a

- 1n yen r':

July 28, 1959 w D 2,896,704

ELECTRIC IGNITING DEVICES FOR GAS STOVES OR THE LIKE Filed Nov. 21, 1955 5 Sheets-Sheet a ELECTRIC IGNITING DEVICES FOR GAS STGVES OR THE LIKE Heinz Aleweld, Gelsenkirchen, Germany, assignor to Messrs. Metallwerke Gebr. Seppelfricke G.m.b.H., Gelsenkirchen, Germany, a German company Application November 21, 1955, Serial No. 547,972

7 Claims. (Cl. 158-115) Electric igniting devices for gas stoves or the like with gas-regulating taps arranged in a row are already known, which consist of a magnetic apparatus producing hightension pulses by displacement of its iron core, and of a bar arranged behind the gas-regulating taps, which cooperates with the movement linkage of the magnetic apparatus and is displaced longitudinally, in each case on rotation of a gas-regulating tap, into the open position from the closed position, by means of a drive member. Such igniting devices have the disadvantage that after initiation of the ignition the rotary movement of the tap into all intermediate positions is not possible without hindrance by the drive member.

By my present invention this drawback is successfully overcome in the case of a gas stove with gas-regulating taps secured against unintended opening, by novel means comprising a drive member constructed as a plunger firmly connected with the handle of the tap and movably mounted in an arm of the associated tap plug, the length of which plunger being so dimensioned that its free end engages, on axial movement for release of the safety device of the tap handle, in a corresponding guide of said bar, while in the case of relieved tap handles it releases the guide.

Thus, as already mentioned, the object is achieved that after initiation of the ignition and relief of the tap handle, the rotary movement of the tap into all intermediate positions is possible without hindrance by the drive member.

According to-one form of embodiment of the object of my invention it is provided that before or on reaching of the large-flame position of a tap handle, due to the cooperation of a radial securing pin of the tap handle with a stop shoulder in the tap-housing recess present for the movement of the securing pin, the rotation of the tap can only be continued when the axial pressure upon the tap handle has been reduced so far that the securing pin can slide on before the stop shoulder. Thereby the bar is freed again of the elfect of the drive plunger.

In the case of a further form of embodiment of my invention the arrangement is made such that in the case of the use of centrally ignited stoves equipped with a centrally arranged ignition-jet head, an arm of the movement, linkage of the magnetic apparatus, in the pivotal movement caused by the bar, by means of a sprung valve plunger of a valve arranged in the auxiliary gas conduit leading to the ignition jet head, briefly opens this valve, so that a quantity of gas under the pressure of the main gas conduit flows to the ignition jet head.

An example of embodiment is illustrated in the drawmg.

Figure 1 shows, in perspective, a gas stove, wherein the stove plate is hinged upwards and the casing and parts of the gas conduits are shown broken away, in order to make the parts visible which are essential to the invention.

Figure 2 shows the cooking stove according to Figure 1, in aview from above, and

ice

Figure 3 shows the magnetic apparatus for the production of high-tension pulses, in cross-section.

Figure 4 shows a single burner with gas-regulating tap, in perspective and partially in section.

Figure 5 shows, in perspective, the installation of a safety valve with igniting flame and bimetal loop for the feeding of the forked burner tubes of the oven.

Figure 5a shows a horizontal section through the safety valve.

Figures 6, 6a and 7, 7a show, partially in section, the closed position and large-flame position respectively of a gas-regulating tap and the associated tap position, in front elevation.

Figures 8, 8a to 11, 11a show,in similar diagrammatic representations, the four positions of a gas-regulating tap and the different operational connections thereof with the movement linkage of the magnetic apparatus and of the valve of the auxiliary gas conduit.

In Figures 1 and 2 the gas stove is equipped with four burners 1 for four cooking positions, which are grouped about a central ignition jet head 8, with which there cooperates a spark gap 9, which is charged with high-tension current pulses of about 5,000 volts. The ignition jet head 8 is provided with four, jet apertures which are directed towards the individual burners 1. In the region of one of the flame jets issuing from the jet apertures there is provided a strike-back tube 4e, which issues from the

oven burner

4a, 4a or the safety valve 4d of the latter (Figure 5). The ignition jet head 8 communicates with the main gas conduit 5 by means of the gas conduit 7. The auxiliary gas conduit 7 is supervised by a valve 6 with a valve plunger 6a under spring pressure, in such a manner that when the plunger 6a is moved against the action of its spring by means of a lever 10a in the direction towards'the, valve 6, the auxiliary gas conduit 7 is opened. The lever 10a lies in the path of movement of the arm 10 with the journal 11. The latter acts with a short arm 12 upon a helical spring 13 and the soft iron core 14 of the magnetic apparatus M (Figure 3), which is movable between two permanent magnetic poles and influences a primary winding 17 and a secondary winding 19. The primary winding can be interrupted by the

switch

15, 16 disposed in the range of movement of the soft iron core 14, whereby a high-tension current pulse is produced in the secondary winding 19, the one pole of which is connected to the spark gap 9 and. the other pole r of which is connected to earth. If under the action of the

arm

10, 12 the soft iron core 14 approaches its end position, it opens the

switch contacts

15 and 16 of the primary current circuit 17, the condenser 18 of which then suppresses the occurrence of a spark between the

contacts

15 and 16.

The arm 10 of the

movement linkage

10,11, 12 of the magnetic apparatus M is connected by means of the draw rod 21 to one arm of the bell-crank lever 22, the other arm of which is articulated to a horizontally movably mounted coupling bar 23 with a return spring 25. For each of the gas-regulating taps with handles there is provided in the coupling bar 23 a guide slot 24, which lies in the range of movement of a plunger 26 issuing from the handle 4 on a stem 40 of each gas-regulating tap 3, subject to spring pressure, and guided in one arm 27 of the rotatable tap plug (Figure 4). Each gas-regulating tap is secured in known manner against unintended opening by a radial pin 3b, which is guided in an axial slot of the tap housing. This axial slot opens into a peripheral slot 3:: of the tap housing, which permits the rotation of the tap when the tap handle 4, which is under spring actionphas first been moved axially inwards by an appropriate amount. On this axial inward movement of the tap handle 4 in the direction of the arrow A (Figure 4) the plunger26 is caused to follow, and enters pressure upon the tap handle 4 is released, then the pin 3b moves axially back, until it becomes free of the stop shoulder 30, and then can be moved back and forth at will between large-flame position T and economy flame position U. Since on the axial return movement of the tap handle 4 the plunger 26 has also returned, the coupling bar 23 is withdrawn from the action of the plunger and can therefore return into the initial position, following the action of the

springs

25 and 13, and then drive the angle member 22, the draw-rod 21 and the

arm

10, 12 which is then situated again in the position according to Figures 1 and 3. If finally the tap handle 4 is returned to the closure position, then the pin 3b comes, through an additional axial movement, into a recess of the tap housing, in which it is again blocked against unintended rotation.

Figures 8, 8a to 11, 11a show diagrammatically various positions of the tap handle 4 for the setting in operation of a single cooking point, each different position of the tap handle 4 being represented again in a front elevation (8a) beside the plan view. Figure 8 shows the closed position S of the tap handle 4 .with its drive plunger 26. In Figure9 the tap handle 4 is moved axially inwards under the actionof its spring x (Figures 6, 7), until the pin 3b abuts against the rear wall of the recess 3a of the tap housing and the drive plunger 26 has entered the guide slot 24 of the coupling bar 23. The tap handle 4 can now be rotated in the direction towards the large-flame position T. It here takes with itthe horizontally displaceable coupling bar 23 against the action of the spring 25 (Figure 1) and causes, through the bellcrank lever 22 and the draw-rod 21, a pivoting ofthe two-

armed lever

10, 12 against the actionof the spring 13 of the magnetic apparatus M. Thelever a participates in thispivotal movement, opens the valve ,6 of the auxiliary gas conduit '7, and sends a current of gas intothe ignition. jet head 8. At the same time the soft iron core 14- is moved axially, abutting against the spring of the contact 15, removes the latter from the contact 16 and thereby interrupts the current circuit of the ,pri-

mary winding 17 of the magnetic apparatus M, which has the result that in thesecondary winding 19 -a hightension current .pulse occurs, which bridges over the spark gap 9. Four ignition flame jets are produced, which are indicated in Figure 2. Only theburner 1, the tap 3 of which has been opened, is ignited. .The rotation of the tap handle 4 in the direction towards the large-flame position T suffers an interruptionat one point, due to the fact that the-pin 3b of the tapv handle 4 abuts against the wall3c, within the recess 3a ofthe tap housing. If now the axial pressure exerted upon the tap handle 4 is released, the tap handle-follows the action of its spring and returns axially, whereupon the handle 4 can be displaced freely between the large-flame position'T and the economy flame position U. Due to the axial return of the tap handle the plunger 26 is drawn outof the associated slot 24 of the coupling bar 23, which has the result that the latter can return into the horizontal'initial position under the action of its. spring 25. The bell-crank lever 22, the draw-rod 21 and the two-

armed lever

10,12 participate in this return movement, their return pivotal movement being supported by the de-tensioning of the helical spring 13 .ofthe magnetic apparatus M. The 'soft iron core l t here also returns into the position as shown in Figure 3, and in which .the contacts 15, loagain close the current circuit of 'the primarywinding ll. In .thepcase ofievery other gas-regulating tap the deflame jets of the ignition jet head 3 (Figure 2).

, 4 p scribed operational movements of the linkage connection between tap handle 4 with plunger 26 on the one hand and the auxiliary gas valve 6 and magnetic apparatus M on the other hand are repeated. Each time a cross of flame jets, as indicated in Figure 2, is produced between the ignition flame head 8 and the four burner heads. 1.

The fifth tap handle 4b which may be seen from Figure 1 supervises the gas supply to the forked

tube

4a, 4a beneath the oven, which is not illustrated separately, by means of the gas conduit 4c, into which there is also inserted a safety valve id with an ignition flame 4g and a bimetal spring 4h disposed in the region of this ignition flame 4g and supervising the valve plunger 4i (Figures 5 and 5a). This safety valve 4d has the purpose, in the case of ignition failures, of preventing the inflow of unignited gas into the

burner tubes

4a, 4a and thence into the burner space beneath the oven. The ignition flame 4g of the safety valve 4d is ignited by means of a strike-back pipe 4e, which opens above the splash plate F (Figure l) in the region of one of the In order to prevent the ignition spark from jumping over before the gas has flowed through the strike-back pipe 4e from bottom to top, the handle of thisgas-regulating tap14b is preferably connected to its stem by a suitable spring detent, which causes the stem to turn afterrotation of the tap handle through about 45. If the further rotation of the tap 4b is delayed in this position for about 10 seconds, then the ignition flame gas flowing out from the opened safety valve 4d receives an opportunity to rise in the strike-back pipe 4e. If the tap handle is then rotated further so as to rotate the stem through the medium of the spring detent, then the gas has meanwhile reached the upper opening of the. strikeback pipe 4e and ignites, when the spark gap is bridged over ;by the high-tension pulse initiated at the same time. Otherwise this fifthgas-regulating tap 4b differs in no way from the other four gas-regulating taps. This tap also can be shifted freely between large-flame position T and economy-flame position U without participation of the coupling linkage, after the ignition.

I claim; 7

1. In a gas stove or thelike, the combination of a burner, a gas regulating tap therefor, a gas conduit extending from said tap to said burner, said tap injcluding an actuating stern slidable axially from an initial nonrotatable position toa second position wherein it may bero-tated between fully closed and fully open settings through an intermediate position wherein it may be rotatcdto adjust the burner flame, a self-contained mag netic induction apparatus having a high tension spark gapdisposed adjacent said burner and including a slidable actuating core, a secondary conduit for delivering gas to said spark gap, an actuating bar slidable transversely to the axis of the stern of said tap and operatively connected to said core, andmeans carried by ,said stern and operatively engageable with said'bar only when the stem is slid to its second position for sliding the bar,

by rotation of the stem, whereby the stem whenin its intermediate position may be rotated to adjust the burner flame without sliding said bar.

2. The combination as defined in claim 1 together with normally closed valve meansprovided on saidsecondary conduit, and means operatively connecting said valve means to said bar for opening the same :When the bar is slid.

3. The combination as defined in claim 1 wherein said last mentioned means comprise a plunger parallel with and rigidly secured to said stem at one end thereof and having a free other end, said bar being provided with a slot adapted to receive the free end portion of said plunger and said plunger being of such length as to enter said slot only when said stem is slid to its second position.

4. In a gas stove or the like, the combination of a burner, a gas regulating tap therefor, a gas conduit ex= tending from said tap to said burner, said tap including an actuating stem slidable axially from an initial nonrotatable position to a second position wherein it may be rotated between fully closed and fully open settings through an intermediate position wherein it may be rotated to adjust the burner flame, a self contained mag netic induction apparatus having a high tension spark gap disposed adjacent said burner and including a slidable actuating core, a secondary conduit for delivering gas to said spark gap, normally closed valve means provided on said secondary conduit, a longitudinally slidable actuating bar disposed transversely to the aXis of the stem of said tap, resilient means urging said bar in one direction, means responsive to sliding of said bar in the opposite direction for sliding the core of said induction apparatus and opening said normally closed valve means, and means responsive to rotation of said stern for sliding said bar in said opposite direction, said last mentioned means comprising a plunger parallel with and secured at one end thereof to said stem and having a free other end, said bar being provided with a slot adapted to receive the free end portion of the plunger and said plunger being of such length as to enter said slot only when said stem is slid to its second position, whereby the stem when in its intermediate position may be rotated to adjust the burner flame without sliding said bar.

5. The combination as defined in claim 4 together with resilient means for urging said stem to its initial nonrotatable position.

6. In a gas stove or the like, the combination of a burner, a gas regulating tap therefor, a gas conduit extending from said tap to said burner, means for igniting gas at the burner, said last mentioned means including a slidable actuating element, and means responsive to ac tuation of said tap for energizing said last mentioned means, said tap including an actuating stem slidable axially from an initial non-rotatable position to a second position wherein it may be rotated between fully closed and fully open settings through an intermediate position wherein it may be rotated to adjust the burner flame, a stop for said stem at its fully open setting, said stop being eliective only when the stem is in its second position, a handle rigidly secured to the stem, and resilient means for urging the stem to its initial non-rotatable position, said means for energizing the gas igniting means comprising a longitudinally slidable actuating bar disposed transversely to the axis of said stern and provided with a slot extending transversely of the bar, means operatively connecting said bar to said actuating element of the gas igniting means whereby said element may he slid to energize the gas igniting means in response to sliding of the bar in one direction, resilient means for sliding said bar in the opposite direction, and a plunger parallel with said stem and secured at one end thereof to said handle, said plunger having a free other end receivable in the slot of said bar and being of such length as to enter said slot only when said stem is slid to its second position wherein the bar may be slid to energize said gas igniting means by operative engagement of the free end portion of said plunger with a side edge of said slot during rotation of said stem toward said stop when the stem is in its second position, said stem being rotatable to adjust the burner flame Without sliding said bar when the stem is in its intermediate position.

7. In a gas stove vor the like, the combination of a plurality of burners, a plurality of gas regulating taps for the respective burners, gas conduits extending from said burners to the respective taps, a common gas igniting head for said burners, a self-contained magnetic induction apparatus having a high tension spark gap at said head and including a slidable actuating core, a secondary conduit for delivering gas to the spark gap at said head, a normally closed valve on said secondary conduit, each of said taps including an actuating stem slidable axially from an initial non-rotatable position to a second position wherein it may be rotated between fully closed and fully open settings through an intermediate position wherein it may be rotated to adjust the burner flame, a longitudinally slidable actuating bar disposed adjacent said taps transversely to the axes of the stems thereof and provided with slots adjacent the respective taps, means responsive to sliding of said bar in one direction for opening said valve and energizing said induction apparatus, resilient means for sliding said bar in the opposite direction, and a plurality orf plungers parallel with and secured at one end thereof to the stems of the respective taps, each plunger having a free end and being of such length as to permit entry of its free end portion into an adjacent slot in said bar only when the associated stem is slid to its second position whereby to energize said induction apparatus and open said valve by sliding of the bar during rotation of the associated stem in the second position of the latter, but whereby the stems of the respective taps may be independently and individually rotated to adjust the burner flames without sliding said bar when in their intermediate positions.

References Cited in the file of this patent UNITED STATES PATENTS 1,488,975 Brown Apr. 1, 1924 1,600,857 Woods Sept. 21, 1926 1,894,006 Rossi et al. Jan. 10, 1933 2,250,356 Brumba-ugh July 22, 1941 2,520,608 Minnich Aug. 29, 1950 FOREIGN PATENTS 511,005 Belgium May 15, 1952