US1878143A - Gas range - Google Patents

Description

Sept. 20, 1932. s. H. HOBSON GAS RANGE v 2 Sheets-Sheet 1 Filed May 21. 1927 Sept. 20, 1932- s. H. HOBSON 1,878,143

GAS RANGE Filed May 21. 1927 2 Sheets-Sheet 2 chamber for the produ Patented Sept. 20 119 32 TION, OF ROCKFORD, ILLINOIS,

PATENT: OFFICE or nocxronn, ILLINOIS, ASSIGNOB 'ro GEO. n. norm; confou- A CORPORATION OF ILLINOIS v GAS RAIi'GE "Application filed m 21, 1927. Serial no. 193,276.

This invention relates to gas ranges and" is more particularly devoted to an improve closed top stove so designed and constructed that the use of four or more burners, in front and rear sets, is rendered thoroughly practical, and about the same operating efficiency is. secured as with an ordinary open top stove.

Actual test has shown that if the open top on a gas stove is replaced by a closed top p without any further alterations there will be evidence of very bad floating, showing that combustion is incomplete. This-is due to the fact that the products of combustion are not conducted away from the burners and prevent secondary air from reaching the flame. According to the present invention I, therefore, employ adistributor plate placed between the burners and the closed top and having connection at the back of the stove with an outlet flue. The distributor plate a has openings therein-over the several burners and conforming to the shape thereof. The flame protrudes through these openings vand induces a flow of secondary air upwardly 3| about the burners and through the openings. The openings are'made sufliciently large so as not to give rise to any trouble in case the burners do not register precisely with the openings. Furthermore, t e openings are de- 30 fined by upturned flanges which serve 1n the nature of flues to further induce the upflow' of secondary air through the openings. The upturned flanges also serve to segregate the products of combustion above the distributor plate from the incoming secondary 111" to prevent contamination of the latter. In other words, the upturned flanges perform a dou-' ble function; they serve to induce a good draft of secondary air to prevent contamination of the alr'by the products of combustion. In face, the isolation of the roducts of combustion is 'so complete that there is never any evidence of faulty operation of the rear burners when the front burners are in use or vice versa.

Experiments on the present stove have also shown that the distance between the 'diStIlbutor plate and the top should be not less than an inch and a half in order to aflord an ample cts of combustion.

- up and have so disposed the ports 'These burners,- when 0 with a distributor plate constructed asherehighest.

p The inventi the flame and also 7 of aga's st They also showed that the distance from the d cooking top to the burner should be not less than an inch and seveneighths for eificient r operation. According to the present invention I have, therefore, provided the distributor plate with raised portions at each of the burners wherein the burner openings are pro vided, the raised portions permitting the roper disposition of the burners and of the distributor plate without placing anyundue restriction upon the passage of secondary air between the burners and'the distributor plate to reach the flame. In this way, floating of the flame is avoided and the desiredefliciency is secured. 4

Experiments further showed that ordinary burners, such as are used in open top stoves, are unsuited for the present purpose as they give very low efliciency when dropped to the level. herein required. According to the present invention I have provided especially designed burner giving the desired flame build therein for etc by the secondary air, the which tend to be starved to suchan extent that. floating of the flame jets. therefrom. is quite noticeable, being of the proper draft of secondary air by a unique arrangement of auxiliary portsperated in connection easyaccess ther innermost parts,

inab'o've briefly set forth, operate without any evidence of floating and at a very high efliciencyv at all loads from the lowest to the on is described in greater detail hereinafter by reference to the accompanying drawings in whichj Figure 1 is a plan view of the'co'oking top] ove made in accordance with my invention, the left hand half of the closed top being removed to disclose the ,distributor plate therebeneath, through the openings of which the burners are visible, and one o the' lids in the right hand half being removed to disclose the grate providedin the opening;

Fig. 2 is a longitudinal vertical section taken on the line 2 -2 of Fig. 1 looking in the direction of the arrows; and

Figs. 3, 4 and 5 are e arged sectional I tails taken on the three section lines shown in Fig. 1 looking in the directions indicated, these views servingizo illustrate the novel construction of the burner itself and also the cooperation of the distributor plate therewith,

the formation of the openings in the latter being clearly shown in these views. The same reference numerals are applied t corresponding parts throughout the views.

The cooking top, indicated generally by the reference numeral 6, in the case of a as range back splasher wall '7 and a burner box back 8,

togetherwith a drip pan 9, and the'usual manifold pipe 10. are'provided in conjunction with the cooking top. These appurtenances are shown more or less fragmentarily. .The cooking top is of the closed type and has top plates 11 set in the rabbeted portions 12 thereof, as shown, so as to present a smooth, flat top surface. The topplate has openings '13 closed by lids 14, the number of openings depending upon the number of burners employed; The latter are indicated at 15. In the present case four burners are shown,.two

ifolds 16 of the burners extend forwardly for c0nnection with themanifold pipe 10 in the usual manner. The manifolds for the front burners are made straight, as indicated in on the under side of the coo ing top 6 between the top plate lland the burners l5 and thus provides a combustion chamber at 18. A

secondary air chamber is provided at 19 between the drip pant) and the distributor plate The plate 17 is provided with openings 20 atthe several burners, these openings being i star-shaped to correspond to the shape ofthe 'burners'15 and serving"to restrict the supply of secondary air to a confined continuous area around the flames of each'burner. By

reason of these openings sufiicient secondary,

air will be entrained by the flames and the natural draft produced by the rising heated air and the expanding products of combustion to support complete combustion of the gas mixture delivered from the burners. The provision of the openings of such size and shapeinsures proper operation despite a failure to get the burners in precise registration I therewith. From the point of view of assembling thisis obviously of considerable importance. The wall of each opening 20 is 7 formed by. anupstanding flange 21" further 'defining the confined continuous area around the flames of each burner whichserves to improve the entrainment of secondary air." These flanges are beneficial forall of the burners but are essential only for thevrear burners because here they serve a further and important function namely that of segregating the products of combustion in the combustion chamber 18fron'1 the incoming secondary air. Contamination of the secondary air is thereby prevented and, as a result, there is no evidence of floating inasmuch as combustion is bound tobe complete. The isolation. of the products of combustion is so complete that there is never any evidence of contamination of the secondary air at the rear burners when the front burners are in use, orvice versa, as was frequently the case in' previous designs with which I am familiar. As a matter of fact, previous designs have not succeeded in overcoming this difficulty to a practical extent. I have found that'it is preferable to incline the flanges 21 inwardlytoward parallelism with the inclined sides of the fingers of the burners in the manner 'most clearly illustrated in 5. This seems to cause the secondary air to impinge better upon the flame and makes for greater uni-'" tributor plate. I have also. ound it 'desirin a front set and-two in a rear set. The manable to provide the openings 20 in raised portions 22 on the plate 17. The reason for this afford an ample combustion chamber and the burner was found to operate most efliciently when disposed at not le'ss'than an inch and seven eighths from thetop plate. Thislefttoo little clearance between the distributor plate and the burners for the proper passageof" secondary air about the burners and into the combustion chamber. I avoid this difliculty by the provision of the raised portions, which permit theproper disposition of the burners and likewise the proper disposition of the dis- .tributor plate. The all-around efliciency is accordingly increased. The distributor plate has an opening 23 at the rear end thereof leading into a flue 24 for conducting the products o brackets 25 and 26 are aflixed to the under side of the plate for the support of the front and rear burners, the brackets 25 providing a ledge on one side thereof to support a front burner and another ledge on the other side' thereof to support a rear'burn'er, as indicated in Fig-20.

The-burners 15 as' stated above, are s'pecombustion from the chamber 18 and to provide fingers or branches 27 radiating 7 from a center hole 28. The fingers 27-are drilled to providemain orts 29 in the top thereof in radially space relation, the openings being sufficiently fewerin number and of sufficiently larger size as compared with top stove.

the ports in an ordinary burner, such as is used in an open top stove, that the desired flame build-up is secured to permit the lower disposition of the burner with respect to the cooking top is required in the case of a closed It will be observed that alternate fingers are provided with three ports while intermediate ones are provided with two. ports. There'is, ordinarily, no difliculty in feeding an adequate supply of secondary air about the fingers of the burner to the two outermost ports on the fingers. The third or innermost ports, however, were found to be hard :to reach with secondary air and were starved to such an extent that there was 'considerable evidence of floating especially at the higher loads. 1, therefore, provide auxiliary ports in circumferentially spaced relation about the center hole 28, each of said ports being disposed between the inner ends of two adjacent fingersand directed at an acute angle with reference to the top of the burner, the angle being approximately as clearly indicated in Fig. 4. The jets from these auxiliary ports, which, by the way, are

of'an appreciably smaller size than the main ports so as not to build up too large a flame at the center of the burner, project upwardly and inwardly toward each other substantially as shown in Figs. 3 and 4, thus inducing a cross-draft between the fingers to feed the in nermost ports and also an up-draft through burner having a central secondary air passage and radiating fingers each of which has main flame ports in the top thereof in radially spaced relation, saidplate having a single secondary air opening conforming to the arrangement of said flame orts in the burner,

and a plurality of auxiliary flame orts in the burner wall arranged around sai central secondary air passage near the top thereof and located between the inner ends of the radiating fingers and inclined inwardly and upwardly for projecting flame jets at such an angle with reference to the plane of the top of the burner as-to serve in drawing air currents to the innermost flame ports in the top of the burner. y

In witness of the foregoing I aflix my signature.

' STANLEY H. HOBSON.

the center hole to further feed the said ports.

The cross-draft and the central up-draft are clearly indicated by the'arrows in Fig. 4. With this unique arrangement of auxiliary ports in conjunction with the main ports the innermost ports are fed with secondary air to the same extent as the outermost ports at all loads and there is never any evidence of floating. The efliciency of the burner is, therefore, raised an appreciable degree.

It will be observed that the openings 13 in the top plate 11 have grates provided therein,

as indicated at 31 in Fig. 1. The fingers of these grates extend radially, as shown, and a are disposed between the fingers of the starof the flame striking the grate and also en- This avoids the likelihood.

ables the full flame to reach the cooking ves.

sel. The radiating fingers of the grate are preferably cast integral with the top plate for simplicity and economy.

.I claim:

A gas range. having, in combination, a Bunsen .burner beneath the cooking top in such proximity thereto as to. secure efliclent heating of a vessel supported thereon directly over the. burner, a bottom plate interposed .between the burner and the cooking top and forming with the latter a confined chamber through which the products of combustion from the burner pass to a flue outlet, said

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