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Sept. 24, 1946. P. c. McLEMORE 2,408,328 APPARATUS FOR CULTIVATION OF PLANTS Original Filed Oct. 11, 1939 - 2 Shèets-Sheet l Offa , %auta 2,408,328 Patented Sept. 24, 1946 UNITED STATESÃPATENT OFFICE › 2,408328 APPARATUS FOR CULTIVATION OF PLANTS Price Chrenlelgh McLemore, Montgomery, Ala. 9 Original application October 11, 1939, Serial No. › :298,870; Divided and this application Novem ber 4, 1940, Serial No. 364,140_ ?? Claims. (Cl. 126_27?.2)_' , tion of plants. ` 'The present application is a division of my' pending application Serial No. 298,8'70, ?ler Oc tober 11, 1939, issued as Patent No. 2327204, on August 17, 1943 _ i ' “ " 2' ume, and also, each point in its cross section is at only a minimum distance from the surface. _Hence when a.. ?ame is applied to both grass blades and to a stemmed plant, the grass may be cooked, scorched and burned before the stemmed Myinvention relates to apparatus forcultiva `plant receives substantial injury. ,This results chie?y from the shape of the subject treated. Rapidly applied heat, that is, a high temperature ' While the speci?c illustration and detailed de scription is directed to the cultivation of cotton gradient, will also-selectively act as between a plants, it is to be understood that this is byeway smaller plant and a larger plant of the same 10 of exempli?cation and not byway of limitation. species. The invention is applicable to the cultivation of This principle of selective _reaction to applied high temperature ?nds itslmost useful, though v other crops, such as corn, legumes, potatoes, tomatoes, sugar cane, and even tocrops such as beets. My apparatus may be employed with the by no means only, application to the cultivation and even to such types as bushesand trees, if desired, particularly when it concerns the prob which will hereinafter appear. cultivation of annual plants or perennial plar'?ts, 15 of row crops such as cotton, and it has particular value in the case of cotton for reasons some of lem of suppressing weeds or casual or incidental plants as against those'intended to constitute- the , crop or to furnish the crop. 20 within a short time, say a few weeks after?plant Also, while the apparatus herein disclosed is ›, particularly applicable to the cultivation of row crops, the invention in its broader aspect is not limited to row crops, as will be apparent herein? after. ~ i ' Theitype of plant which lends itself most read ily to this mode of cultivation' is that which ~ The principle upon which the apparatus of my invention proceeds is the discovery that there is a marked -di?'erence in the resistivity of plants ing, grows su?iciently and is of such acharacter that it will produce or 'develop a stemg system that is materially larger in body, both as to di-› ameter and ,as to height, than the obnoxious vegetation which is to be destroyed vorinhibited. Advantage may be taken in` the di?erential in growth: between the stem plant `and the grass or e other obnoxious vegetation by setting out young plants instead of growing the plants in place „to this application of heat, particularly heat at from seed. For a crop such as cotton, which it high temperature. It is known that frost-and 30. protected from freezing will -produce for several cold affect various plants 'quite differently. r l: ?n\d that there are at least equal differenc'es in their reaction to 'applied heat, although the di?erences in reaction are intensi?ed, according to my invention, inasmuch as the heat is applied under control as to place or point of application, as well as in respect to time, Volume and intensity'. Theplant that will endure cold does not neces sarily-react in. the same manner to applied high temperature. › ~ I have found that by the application of heat under suitable control, and' as to, time, tempera ture, Volume, and point or 'region of application, years on the same root and stem system, the difierentia? in size may be obtained at an earlier_ date than would be possible from seed grown plants.- Since, however, most row crops -are grown in place from seed, thespeci?c description of v an embodiment of' my invention herein_ set forth assumes seed planting. Since an initial rapid growth, or an advanced stage of growth are 40 favorable factors,_I `intend the same to be. in cluded within the scope of the present invention. The apparatus of my present invention ?nd par ticular_ application on any row crop which, by natural or arti?cial means, may be made to yield certain of the vari?tiesin: a stand of vegetation of mixed character may be selectively destroyed. 45 a stem system whichis materially larger, and hence moresheat resistant, than the accompany The useful application of the principle involved in my invention resides not so much 'in the ing obnoxiousvegetation. or rapiclly applied heat, particularly' at high tem peratures, that is, applied at a high tempera is at present attainable; The chief object of the present invention' is to natural resistance to hotter or colder 'climates of provide apparatus for the cultivation of crops, diiieret kinds of plants or vegetation, but rather in the different e?ect? of, or reaction to\ suddenly 50 particularly such as cotton, at a lower cost _than ture diiierential. ' such a process is' comparable v . It .has heretofore been attempted to mech anize certain steps in the production of cotton to singeing. The shape- of a blade of grass is ` ?ber; The .original bottleneck in the production ` such that it presents a large area for a given vol 55, Qi cotton was in the separation of the seeds from ~ . the fiber, which was solved by the cotton gin. 4 . i?cation of the apparatus shown in Fle-ures The planting of the seeds by machinery is, of and 2 where the bumers are carrled in advmce course, a simple matter. Harvesting the cotton, as by mechanical cotton pickers, is a demon strated possibility but ,for the present is uneco nomic for the reason that up to the present time of the tractor. invention, the cultivation of cotton 'in conjunc tion with the apparatus of my present invention no adequate and universally applicable mechan will now ?be described. ical device ,for destroying or inhibiting the growth of obnoxious vegetation, such as grass The ?eld to be planted-is plowed, bedded and 'planted as usual, with the exception that, pref and weeds, has been developed. ,Hence hand cul erably, care is taken to produce as ?at a seed bed as possible. V In general, planting should fol tivation has been unavoidable. With the re 4 As a specific example and embodiment of my . ` quirement for human labor in cultivating the low immediately after bedding in order to insure cotton there is little economic advantage in the use of a mechanical cotton picker when the labor available for that step must be maintained on account of the necessity for manual cultivation a clean seed ?bed. of the cotton in the earlier stages. ` As soon as the cotton reaches a good and full stand it is first plowed and the dirt thrown back towards the cotton. During the next several weeks the cotton should be plowed as often as may be necessary to prevent Another object of the present invention is to provide apparatus for cultivating cotton by ma the growth of obnoxious vegetation, preferably at and harvesting cotton may be mechanized. A further object of the invention is to improve around the cotton by each plowing operation. least once a week. While not essential, material chinery so that hand cultivation may be Vdis 20 ly improved results are obtained if as much dirt as possible, without' covering the plant, is thrown pensed with and the entire operation of raising Cultivation is continued in this manner until the cotton plant has four leaves, or, in other the crop in quality and yield. By the use of the present apparatus, less disturbance of the root 25 words, about-four weeks old. At' about this stage of growth the plants may be chopped into a system of- the cotton plant is occasioned, and the crop proceeds more rapidly. Also, less waste of . stand of hills each containing four to six stalks. Chopping may ?be done in a number of ways, as, fertilizer is entailed by the use of the present for example, by plowing across the rows in such ap'paratus, and I have found that crops such as cotton which normally require considerable :30 a manner as to cover or turn under all cotton except' theidesired hills, which preferably should quantities of chemical fertilizers to insure nor be spaced about two feet on centers. Chopping ,mal yield and quality, may ?be cultlvated with a material reduction in the quantity of fertilizer may also be done, if desired, by hand labor, where required. This reduction in quantity of fer by the unwanted plants are removed by hoeing or tilizer is accomplished by the more effective re 35 by any mechanical contrivance which will, in e! moval of the obnoxious vegetation than here fect, remove'the unwanted plants.` After chop ping the cotton should, in general, be swept at tofore was possible. The reduction in the amount once. For the next two or three weeks sweeping is of fertilizer used may also in part be due to continued as often as may be necessary to keep transformations, either Chemical or physical, in the fertilizer due to the heat employed, with the 40 all young grass covered, prei'erably at least once result that the active constituents are rendered aweek. better available to the plants throughout their When about six weeks old the cotton will have growing period, instead of being lost by solution grown to a fairly substantial size, each stalk in rain or other irrigation waters. being, say about 17/5" in diameter and from 4" In the preferred form of apparatus of my inven 45 to 6" tall. ,By this time the obnoxious vegeta ticn will have become very di?icu?t to control 'tion heat is generated in the form of a blast of by sweeping alone. The apparatus of my inven ?ame which is caused to impinge upon the ground tion may› now be employed to effect the de alongside of the plants in the row in such a man struction of the obnoxious vegetation. As previ 'ner as to destroy the obnoxious vegetation with out at the same time doing any substantial injury 50 ously noted, the apparatus preferably comprises bumers for applying the heat in the form of to the row crop plants. Now in, order to acquaint those skilled in the art with the constr-uctlon and operation of spe ci?c embodiments of my invention I shall de a. ?ame. The bumers or other means for pro -Jecting heat are preferably mounted upon a ve hicle which is adapted to be moved along at a scribe, in conjunction with the accompanying 55 substantially constant velocity so that the time of application of the ?ame multiplied bythe drawings, apparatus embodying specific examples temperature thereof will be _e?ective to destroy of my invention. the obnoxious vegetation, but will not injure the In the drawings: ‹ Figure 1 is a side elevational view, more or less crop. Preferably, the bumers or the Llike are diagrammatic, of a tractor provided with bumers 80 mounted upon an ordinary farm tractor which has an automatic speed governor as' is well known and fuel supply means in accordance with my in the art, so that the tractor may bepropelled invention; at a predetermined constant velocity. Obviously, Figure 2iis a front elevational view of the same, the bumers or the like could be mounted upon` showing the method of treating the obnoxious a vehicle which is drawn by the tractor, or if `vegetation and the crop plants; / Figure 3 is' a diagram illustrating how/differ `desired constant speed could be attained?with' ences in form a?ect the selective ability to with- ~ animals as the motive force.` 'The apparatus ispreferably designed so that 'the ?ame may be directed to e?ect destruction stand applied high temperatures; Figure 4 is a similar diagram, showing how variations in size of cross section a?'ect the re sistivity to high temperatures; 70 of the obnoxious vegetation of approximately two to four inches on both sides of the row. With this type oi' apparatus the obnoxious vegetation Figure 5 illustrates how the same plant at dif in the center of the' row may be controlled by tereni; stages of growth has different resistivity plowing. to applied high temperatures; and Figure 6 is a fragmentary illustration Of a, mod .75 Although it is not essential, I prefer that the v cotton be swept after each burning. Burnlng equipment. and through the conn'ecting arms ?s, may be repeated as often as is necessary to sup- ' ~|9 and connectlng rod 20, the sweeps !3 and the burners IS may be raised and lowered. suitable bracing means (not shownimay be employed for supporting the sweeps and burners. Power mechanism may be employed, if desired, to raise press the obnoxious vegetation, preferably once a week for the next four to six weeks or until mature plants are obtained. As the plants grow older, more intense heat for longer intervals of time may be?applied to e?ect the destruction of the obnoxious Vegeta tion, without injury to the cotton plants them and lower these parts. ” The arm IS has a horizontal extension 22 at the rear end and upon this horizontal portion are selves. In the latter stages of growth, obnoxious 10 mounted, by means or brackets 23, 23 the indi vidual burners 25, 25. The burners are adjust vegetation of practically any size may be re able as to height in the lbrackets 23 as by means moved by ?aming. `With the young cotton, how of the set screw adjustment 24. In each of the ever, care must be exercised to prevent injury to banks of burners here shown I have indicated the cotton plant. For this reason it is preferable that the cotton be swept during the interval 15 four individual burners 25, but obviously the number may be larger or smaller, as desired. The prior to the ?rst burning often enough to prevent burners 25, 25 may generate a free ?ame of from the growth of obnoxious vegetation until the 2" to 21/2" in diameter ?by 12" to 16" long, and plants are large enough to withstand ñaming, as they are spaced from the surface of the ground previously noted. The ?rst several burnings should preferably, therefore, be frequent enough 20 a distance of approximately 6", in the speci?c in stance here illustrated, so that the ?ames from so as to insure that no obnoxious vegetation these :burners bathe the ground and the stems reaches an advanced stage of growth. Tests have of the cotton plants 21. Preferably, although shown that grasses and other forms of obnoxious not necessarily, heat barriers in the form of as vegetation are burned almost _instantly by the torch ?ame if the ?ame is applied as soon as the 25 ?'bestos or transite plates 28 are carried on brack ets 29 from the arm extensions 22, 22 so as to obnoxious vegetation breaks through the ground. As previously noted, the burning is continued interpose their insulating e?ect between the burn ers and the foliage and tops of the cotton plants 'at intervals until a mature and fruiting plant is or other crop plants in the row. These shields obtained. The burning may then be discontinued and the cotton left until the bolls open. The 30 are not Strictly necessary, but they permit the burners to be brought more closely together ad cotton may then be picked, either by hand labor jacent the foot or stem of the plant without do or by a mechanical device, as desired; ing any unnecessary injury to the foliage and Referring now to Figures 1 and 2, I have shown tops. Since the ?bodies of the burners 25, 25, par a tractor of known construction, comprising diri gible wheels l at the front and driving wheels 2 35 ticularly in the :blow torch type of burner, grow quite hot these shields, in addition to limiting the at the rear. The front wheels l are steered by projection of ?ame, limit or guard the plants a suitable steering mechanism including the against contact with the hot burner parts. steering wheel 3, Operating mechanism in the A supply tank 3I is carried on brackets 29, 29 front post 4 to steer the tractor as desired. The front and rear wheels are connected by a suitable 40 upon the vehicle. chassis frame 5, and upon this frame and partly in it is mounted a power plant including an in ternal combustion engine having suitable fue] ` supply means, an exhaust pipe, and suitable con trols'for governing the starting, stopping, and speed of the engine. The tractor is provided with an automatic speed governor for maintaining a fixed speed as is well known in. the art. A cool ing system, including the radiato?' 6, is mounted at the front end of the chassis frame and a suitable hood 1, which forms a protection for the engine and houses fuel and water tanks for the engine, extends rearwardly from the top of the radiator 6. The tractor is provided with a suit able seat 8 for the operator, and in convenient position from the seat are the usual controls for governing the operation of the tractor. The In this case the b?'ackets are mounted upon the top of the tractor hood 1, although any other suitable, preferably elevated, position may be employed. The location of the tank 3| is not of importance except that where gravity feed is desired the tank should be suit ably elevated. The tank may be carried upon an other vehicle or at some other location on the same vehicle, if desired. The tank 3| is provided with a ?ller cap 30, which is preferably .capable of affecting an air seal, and the tank in the pres ent instance is adapted to be put under air pres sure :by means of a hand air pump 32, a gauge 33 being provided to indicate the pressure in the tank. For :burners of the blow torch type here illustrated, this pressure may be'of the order of from 10 to 50 lbs. per square inch. › As shown in Figure 2, four banks of burners !6, for servicing two rows of plants simultane rear wheels 2 are spaced to go outside of two ously, are provided. From the tank 3! a supply rows and the front wheels I are located so as to travel between the same two rows, as is clear GU line 34, provided with a suitable shut-off valve from Figure 2. This type of tractor,` commonly employed for agricultural purposes, is equipped with a cross-bar 9 at the front. The cross bar 9 is secured to the frame of the tractor as by means of brackets |0-|0. This type of tractor is fre quently supplied with' sweeps either extending 35, extends to a cross pipe 36, each end of which is extendecl downwardly as at 31 to connect with a manifold 38 at each side of the tractor. The manifold 38 is provided with T connections 39, 39 leading o?' through suitable ?exible con nections 40, 40 to the individual burners 25. The ?exible connections may be of a rubber-like ma- V in front of the cross bar 9 or to the rear of the terial immune to the action of oil, such as neo same. Likewise, at the rear of the tractor a simi prene or Thiokol, or alternatively it may be a lar cross bar |2 mounts the rea-r sweeps 13 upon a suitable mounting arm 14. A similar arm !5 70 flexible metal turbing, or ?exible metal hose, or armored hose, or any other suitable ?exible pres connected to the cross bar 9 at the front may sure and oil-resisting connection. Each ?exible normally support sweeps such as those at !3 but, in the present Construction, there is held mount ed upon the lower part of the arm [5 a bank of oil burners IS.. By- means of a lever l'? or like hose 40 connects to its individual burner 25 through a regulating valve 42. A removable screen is mounted at 43 in the line between the 7 8 fuel supply tank and the burner tip so as to screen or strain out any scale or other solid impurities which might plug up the :burner ori?ces. I have shown the vaporizing type of burner, such as the common blow torch embodies. The that the ratio of area to Volume of the blades of grass as compared with the stem of the cotton v ' plant is immensely greater. Likewise, the dis tance of any living cell in the grass blade from the surface is very much less than the distance of a burners are initially heated up and upon becom ing heated they serve to vaporize the fuel which cell in the central part of the stem 46 from the surface. So that, even if the stem 46 should be is fed to them under pressure and project a hot,_ singed upon the surface, the living cells in the colorless and smokeless flame, as is well known central part of the stem would receive no injury, to those skilled in the art. The ;bank of burners 10 whereas the entire blade of grass would be de stroyed. IS, instead of being carried rearwardly on the arm l5 may ibe carried on an arm 44 projecting Even in the case of stemmed vegetation of forwardly of the ;cross bar 9, as shown in Fig smaller diameter than that of the crop plant 46 ure 6, the bank of burners; in that case, being as shown in Figure 4, it will at once be appre mounted upon a horizontal portion 45 of the 15 ciated that the smaller stems 48, 48 would be de arm 44 so as to be carried in front of the vehicle stroyed before the stem 46 would receive sub instead 'of ?behind the_ front wheels I. stantial injury if the two were subjected to a The particular form of burner is optional With high temperature ?ame for a short period of in my invention. That is to say, while I have time. shown the vaporizing type of burner (and this 20 is the preferred type), I intend to include with in the invention any alternative form of burner or heat projecting means for accomplishing the The principle of selectively causing inJury by the application of heat is applicable to plants of the samekind of di?erent size, as may ?be seen in Figure 5. Assume that the older plant 50 same purpose in substantially the same mannner. and the younger plant 49 are subjected to the For example, an atomizing type of burner de 25 same projected heat, it will be obvious that the pending upon the dellvery of oil through an ori younger plant 49 will perish before the older ?ce at very high pressure may be u-tilized. In that plant 50 is seriously aifected. Quite obviously, as case, a suitable power pump and storage tank _ between vegetation of a lighter structure, such as may ;be employed. The pump in that case may blades of grass, and that of a heavier structure, be driven from the tractor engine or any other 80 such as stemmed plants, there is a wide margin suitable source of power, and one or more or all which my invention may be employed to take advantage of. _ i › of the burners may be supplied with pressure from the same source. An air atomizing or steam atomizing burner` of the cannon type may also be employed, if de sired. In that event, means for generating a suit able atomizing ?uid pressure,'as, for example, an air compressor and tank, or a steam ?boiler, for generating the atomizing pressure, may be carried by the tractor or on a vehicle Operating in con I prefer a higher temperature differential, such as is Secured either by a ?ame, since the heat transfer not only is more rapid but is instantly discontinued as the nozzle or burner passes. While I have indicated certain ways in which my invention may be embodied and practiced, it is to be understood that the above speci?c 40 illustrations are but exemplifications of the basic junction therewith. concept, and that I do not intend to be limited by The vaporizing or blow torch type of burner the speci?c illustrations except as the following is` generally preferable for the reason that an un claims are speci?cally directed to the same. con?ned ?ame generated by this form of burner In the more or less schematic showing of Fig is shorter, that is, burns in shorter length and in 45 ures 1 and 2, four burners on each side of each less space than an atomizing type of burner, row are shown. Obviously the number of ?burn although I do not mean by this to exclude others ers may vary with local conditions and different by the above indicated preference. crops. However, the burners shown, when at The operation of the device shown in Figures' 1 tached to a tractor running four miles per hour and 2 is as followsz- The operator of the tractor and generating ?ames from 2" to 21/2" in diam having put the burner banks IS into operation, eter by 12" to 16" long if directed into free space, drives the tractor along the two rows as indi are on the average satisfactory for the cultivation cated in Figure 2 at a speed`which is adjusted of cotton as previously outlined. 'For other row to the ?ame and to the selective action upon the crops, or other local or unusual conditions, either r crop plants and obnoxious vegetation as deter mined by the size of the plants 21, the density of the obnoxious vegetation, and similar factors. Usually the tractor is driven at a rate of about 55 fewer or more burners may be used as required, and it is to be understood that the size of plants determines to a large extent the intensity and I amount of heat which they will withstand with four miles per hour, at a substantially uniform out injury, and the operator is .expected to vary speed throughout the length of the row. When 60 the procedure accordingly. ' the ?ame is developed in good Volume and directed One great advantage of the present system of upon the ground at the base of the crop plants cultivation is that it is substantially independent 21, it cooks, sears and singes the grass and other of the soil conditions. That is to say, even obnoxious vegetation without doing substantial though the ground might be too wet for cultiva injury to the crop plants, such as the cotton tion by plowing or sweeping, the apparatus of my plants 21 illustrated in Figure 2. One reason invention may be employed if the ground is ?rm why a stemmed plant is less subject to injury enough to support the tractor, or any other con than grass or other obnoxious vegetation of that veyance suitable for the application of heat in type is illustrated in Figure 3. v accordance with my invention In Figure 3 I have shown a cross section, and The sweeps shown in Figure 1 at the rear of diagram?natically, the stem 46 of a stemmed the tractor are preferably employed immediately plant. This is, .of course, on an enlarged scale. after flaming, but it is to be understood that this At 41 I have shown in cross section, and diagram is optional and 'they may be dispensed with. matically, leaves of grass constituting the ob The operation of ?aming, according to my in noxious vegetation. Now it will at once Ibe seen 75 vention, appears to have a greater retarding ef 25408328 r v v . - 9. , mere-cutting'o? of as_ much as is' destroyed by the ?aming. In other words, ?aming_ appears to give a greater setback to plant growth than does i equivalent injury by mechanical means., _ . 10 . , pair of burners carried by said mounting means upon opposite sides of an intermediate vertical plane which extends longitudinally of the vehicle and which intermediate vertical plane is adapted to coincide substantially with the crop row in the operation of the vehicle, each of said' burners feet upon the growth of noxious plants than the I claim: - e _ being directed diagonally down toward the sur 1. A ?ame cultivator comprising a vehicle hav face .of the supporting ground short of 'the line of intersection of the" plane and the ground. vehicle on the ground, aupair of burners 'con nected to the vehicle ,for travel therewith, and 10 said burners comprising means for projecting a Volume of' ?ame which spreads along the ground fuel supply means carried by said vehicle for sup- › and ?oods across the intersection of the plane and plying said burners, said burners being disposed ing ground engaging wheels for supportingthe 'the ground for impinging directly against the upon opposite sides of a vertical plane which ex- _ tends longitudinally of thevehicle and parallel weeds and the plants in the piant row, lifting burner being dir'ected diagonally downwardly in means substantially vertically around said trans verse pivot axis to raise and lower said burners, to the line of forward travel of the vehicle, each ` 15 mechanism operative to Swing said“ mounting a direction substantially crosswise of said vehicle for causing its ?ame ”to strike the surface of the ground supporting the `vehicle at a point short of a fuel tank on said vehicle, and supply connec tions for conducting the fuel from\ said tank to the line of interséction 'of the said plane and the, 20 said burners, said supply connections comprising sections of fiexible hose to accommodate the ground, said burners and fuel supply means co- I Operating to cause each burner to project a rela tively long` otherwise uncon?ned ?ame which is aforesaid vertical movement of said burners. g ' '5. A row crop cultivator forbathing the bases of the crop plants and weeds in a row with ?ame, spread by impingement' _against the ground to form a laterally widened sheet of ?ame of shallow .25 comprisingthe combination with a vehicle having ground engaging wheels for supporting the vehicle, _said vehicle being adapted to travel along the depth which flows along the ground and ?oods across the line of intersection of 'the said plane and the ground_ ~ . ` , crop row to be treated, offa blast burner con i 2. The cultivator of claim 1 wherein the vehicle is self-propelled and has a speed control governor whereby the time of application of the ?ame to an object exposed to the ?ame is de?nitely deter V _ nected to the vehicle for travel therewith, fuel supply means carried by said vehicle for supply ing said burner,said burner being disposed' to mined. tudinally of the vehicle and paralle? to the line of _forward travel of the vehicle, said burner being directed diagonally downwardly in a direction ` 3. A row crop cultivator for bathing the bases one side of a vertical plane which extends longi of the crop plants and the weeds in and along the ,sides of a row with ?ame, comprising the 'com substantially at right angles to said vertical longi bination with a 'vehicle 'having ground engaging tudinal plane for causing its ?ame to strikethe wheels for supporting the vehicle and adapted to' ground at a point short of the line of intersection travel along the row to be treated, of a burner tof thesaid plane and the ground and in a direc system carried by said vehicle comprising a liq 40 tion substantially 'at right angles to said plane, uid fuel tank, and a pair of high pressure liquid - and a. shield connected to said vehicle and fuel burners fed therefrom and mounted on said _adapted td travel between the burner and the vehicle upon opposite sides of an'intermediate crop row in the operation of the vehicle, said vertical plane which extends longitudinallyof the shield having its lower edge spaced 'from the vehicle in'the direction of itsintended line of 45 ground, said burner being of a'high capacity blast travel, and which, plane is adapted to coinclde type projecting a relatively long uncon?ned ?ame substantially with the crop row in the use of said vehicle, each of said burners being directed di which passes under the lower edge of 'said shield and ?oods into and through the plant row, where _agonally down toward the surface of 'the sup- ' by as the vehicle moves along the row 'the bases porting ground short of _the line of intersection of 50' of the crop plants and the weeds in said row are the plane and the ground, _and having means for bathed in ?ame. ? , _ projecting a relatively long uncon?ned blast of 6. In a ?ame cultivator adapted to cultivate high intensity ?ame against and along the sur' row crops by the ?ame method, 'the combination face of 'theground in a direction substantially a vehicle having ground .engaging wheels for transverse to the line of travel, said burner sys 55 ofv supporting the vehicle, a pair of burners con tem and. burners being of the high pressure _type nected to saidvehicle for travel therewith,` and Operating at pressures up to approximately 50 lbs. 'fuel supply means carried by said vehicle for sup per square inch for causing each of said burners plying said burners, said burners being disposed to project a voluminous blast of ,free ?ame of ap upon opposite sides of 'a vertical plane which ex proximately'lmto 16 in'chesin' length,` and the discharge ends of said burners adapted tof-be 60 tends longitudinally of the vehicle and parallel ~ to the line of forward travel of the vehicle, each spaced from the ground a distance of approxi mately 6 inches so that the ?ames fromI-said burners bathe the ground' along and on each side burner being directed diagonally downwardly in a direction substantially crosswise of, said vehicle and toward said plane for causing its ?ame to of said line of _intersectionin a voluminous high 65 strike the surface of the ground at a?point short' intensity ?ame./ i ` ' of the line of intersection of the said plane and 4. In a ?ame cultivator adapted to cultivate the ground, whereby the ground serves as ade row crops bythe ?ame method, the combination flecting means for causing each ?ame to'spread of a vehicle having 'ground engagíng wheels for› ' supporting the vehicle, . vertically swinging mounting means pivotally connected to said ve hicle „on a substantially ,horizontal transverse pivot 'axis and 'extending rearwardly from said ` axis 'whereby the rear portion of said mount pivot 70 out and to ?ood across the line of intersection of the said plane and the ground in_ the form of a thin sheet of ?ame ?owing along the ground, so / that_ the impingement of the ?ames against the plants in the' crop rows is con?ned substantially ing means 'can swing substantially vertically, a 75 _entirely to the base portions of the plants and' , frago/3,398' i 11' 12 , destructive inJu?-yto the upper portions of the › by said mounting .means `for supplying said' _ burners; said burners being disposed upon opposite . r v sides of a vertical' plane which extends with re 7. A row crop cultivator for bathing the bases spect to 'said mounting means parallel to the in of the crop plants and the weeds in and along the sides of a row with ?ame, comprising' the com- _5 tended line of forward travel thereof, each burner being directed diagonally downwardly in a direc bination, of mounting means for mounting on a vehicle, said vehicle having ground engaging „ tion substantially crosswise of said vertical plane for causing its ?ame to strike the surface of the wheels for supporting the same andwhich'is .ground at a point short of the line of inter-sec adapted to travel along the row to be tr?ated, a plants is avoided. burner system carried` by said mounting means 10 tion of the said plane and the'ground, said burners 'and fuel supply means cooperating to cause each comprising a liquid fuel tank, and a pair of high' / burner to project a relatively long otherwise unpressure liquid fuel burners fed therefrom and con?ned ?ame which is spread by' impingement mounted on saidmo?mting means upon! opposite sides of an intermediate vertical plane which ex _ . against the ground to form a laterally widened tends with respect to said mounting means in the 15 sheet of ?ame of shallow depth which -?ows along the ground and ?oods_ across the line of inter direction of its intended line of travel; and which section of the said plane and 'the ground. plane'is adapted to coincide substantially with 10.; A row crop cultivator for bathing the bases the crop row in the use „of said mounting means, I i of the crop plants and weeds 'in a row with ?ame, each of' said burners being directed diagonally , down toward the surface of the. ground'short of 20 comprising-the combination, of mounting means for mounting on a vehicle,-said vehicle 'having `the line of intersection of the plane and the ground, and having means for projecting _a rela- .` ground engaging› wheels for supporting the ve hicle, said vehicle being adapted to travel along tively long uncon?ned blast of high -intensity ?ame against and along the surface of the ground the crop row to be treated, a blast 'burner con in a direction substantially transverse to the line 25 nected to said mounting means for travel there with, fuel supply means carried by said mount ing means for' supplying said burner, said burner of travel, said burner system and`burners being of the high pressure type Operating at_ pressures being disposed to. one side of a vertical plane up. to approximately 50 lbs. per square inch for' which extends 'with 'respect to said mounting causing each of said burners to project a volumi nous blast of free ?ame of appro'ximately 12 to 16„ 30 means parallel to the intended line of forward inches in length, and the discharge ends of said , travel thereof, said burner being directed diago nally downwardly in a direction substantially at bume?'s'adapted to be spaced from the ground?a distance of approximately 6 inches so that the _ right angles to said vertical longitudinal plane for causing its ?ame to strike the ground at a ?ames from said burners bathe the ground along and on each side of said line of intersection/in a '35 point short of the line of intersection of the said voluminous high intensity ?ame. plane and the ground and in a direction substan ing means pivotally connected to said 'support t means on a substantially horizontal transverse type projecting a relatively long uncon?nedl?ame tially at right angles to said plane,_ and a shield 8. In a ?ame cultivator adapted to cultivate connected to said mounting means and adapted row crops by the ?ame method, the combination, to travel between _the 'burner and the crop row of support means 'for mounting on a vehicle, said vehicle having ground engaging wheels for sup- 40 in the operation of the vehicle, said shield being adapted to -have its lower edge spaced from the porting the vehicle, vertically swinging mount- ` ground, said burner being of a high .capacity blast which passes under the lower edge of said shield pivot axis and extending rearwardly from said pivot axis whereby the rear portion of said mount- 45 and floods into and through the plant row; where by asthe burner is moved along the row the bases ing means. can swing substantially vertically, a of the cropplants and the weeds in said row _ pair of burners carried by said mounting means are bathedin ?ame. upon opposite sides of an intermediate vertical ` 11. In a ?ame `cultlvator adapted to cultivate plane which extends transversely of said pivot axis and which intermediate vertical plane is “row crops bythe ?ame method, the combination, of mounting means for mounting on a vehicle, adapted to coincide substantially with the crop sald vehicle having ground engaging wheels for row in; the intended› movement of 'said support supporting the vehicle, a pair of burners connected' means, each ofsaid burners being directed'di to said mounting means for travel therewith. and agonally down toward the surface of the ground short of the line of intersection of the plane and .55 fuel supply means carried by said .mounting means for supplying said burners, said burners being dis the ground, said burners ccmprising means for posed, upon opposite 'sides of a vertical plane projecting a Volume of ?ame whiclrspreads along which extends with respect to- said mounting . the ground and ?oods across the intersection of *means parallel to the intended line of forward ` the plane and?the ground for impinging directly against the weeds and the plants in the plant row, 60 travel -thereof, each burner being' directed diago nally downwardly in' a direction substantially lifting mechanism operative to swing said mount crosswise of said vertical plane and toward said ing means substantially ?ertically around said plane for causing its ?ame to strike the surface transverse pivot axis to . iee and lower said› of the ground at a point short of the line of in burners, a fuel tank adapted to be mounted on p said support means, and 'supply connections for 65 tersection of the, said plane and the ground. whereby the ground serves as a de?ecting means conducting the fuel from said tank to said burners, said supply connections comprising sec- _ for causing each flame to _spread out and to ?ood across the line of intersection of- the said plane tions of ?exible hose to accommodate the afore- _ I said vertical movement of said burners. and the _ground in the form of a thin sheet of 9. A ?ame cultivator comprising the combina- 70 ?ame. ?owing along the ground, so that the im pingement, of the ?ames against the plants in the - tion. of mounting means for mounting on a ve hicle, said vehicle having ground engaging wheels ' crop rows is conflned substantially entirely to the for supporting the vehicle on the ground. a pair of burners connected to said mounting means for . travel therewith, and fuel supplyxmeanslcarried 75' base portions of the plants and destructive injury › to the upper portions of the plants is avoided. PRICE CHRENLEIGH MCLEMORE.