D¢¢- 3, 1946- _ H. B. HoLTHousE 2,412,088 UNIT HEATER Filed Nov. 12, 1941 y '7 Sheets-Sheet 1 Dec. 3, 1946. H. B. HoLTHousE 2,412,088 UNIT HEATER Filed Novß 12. 1941 7 Sheets-Sheet 2 NN l I l I l l b l N l l 92 ll l/ ä Dem 3, 1946. H HOLTHOUSE ` 2,412,088 UN I T HEATER Filed Nov. l2, 1941 ‘7 Sheets-Sheet I5 Dec. 3, 1946. ' H. B. HQL'rHousE 2,412,088 UNIT HEATER Filed Nov. 12, 1941 l 'r sheets-sheet 4 îï i', ß l?" 'N ‘n Dec. 3, 1946. H.B. HoL'rHousE.' 2,412,088 UNIT HEATER ' Filed Nov. 12, 1941, 7 ¿heats-sheet 5 Dec. 3, 1E§46.`A __H. B. HoLTHousÈ ' ì . 2,412,088 UNIT HEATER Filed Nov. 12, 1941 n ‘ 7 sheets-sheet e f De¢.3,1946. ' Hamm-HOUSE y' 2,412,088» v UNIT 'HEATER Filed Nov. 12, V15241 @1 'I sheets-sheet 7 U1 95/ N,î ' ' gli" .1 1 | I CQ ‘ä jab” ¿,103 ' 103 f3' 103%@6/2/07? 2,412,088 Patented Dec. 3, 1946 -UNITED STATES PATENT ori-‘ice ` 2,412,088 UNIT HEATER Harry B. Holthouse, Chicago, Ill., assignor to Galvin Manufacturing Corporation, Chicago, Ill., a corporation of Illinois ' Application November 12, 1941, serial No. 418,774 (ci. 12e-11o) 11 Claims. 2 l This invention relates generally to air heating systems and in particular to a self-contained air lowing description when taken in connection. with the accompanying drawings in which: heating unit including a burner of internal com bustion type operated in conjunction with an in ternal combustion «engine and assembled with the engine as a portable unit to provide for thev sup ply of heated air at any desired location. of the invention as applied to the heating of the> engines of an airplane for starting purposes, the heater for the purposes of illustration being shown enlarged relative to the size of the air Fig. 1 is a perspective view showing one form ' It is an object of this invention to providel an > plane; ' « Fig. 21S-a fragmentary lsectional view of the improved air heating system. Another object of this invention is to provide 10 inlet to the airplane duct system shown in Fig. 1 showing the positioning of a cap thereon when a portable air heating unit which is compact in assembly, simple and rugged in construction and the airplane is innight; t A further object of this invention is to provide a portable air heating unit capable of heating an airplane engine for starting purposes in a mini with the engine removed therefrom; Fig. 5 is a. sectional view of the heating unit mum of time. ’ Fig. 6 is a sectionalrview as seen along line 6 in Fig. 5 showing fuel vaporizing means used in ' - Fig. 3 is a plan view of the complete heating eilicient in operation to deliver a relatively large volume of air at a high‘temperature to a source ` ` unit shown in Fig.»1; Fig. 4 is a side view of the heating unit of Fig. 1 remote from the heating unit; v as seen along the line 5-5 in Fig. 3; Yet another object of this invention is'to pro vide a self-contained air heating unit for heating airplane engines having means providing for its the operation of thel heater or burner portion of the complete heating unit; ' Fig. 7 is a plan view of another form of a com .being simply and easily moved about under all plete heating unit; ` weather conditions; provide a duct system for heating airplane en ` ~ ~- Fig. 8 is a -side view of the heating unit of Fig. A still further object of this invention is to 25 7; - Fig. 9 is a sectional view as seen along the line gines which is carried in the airplane wings and 9-9 in Fig. 7 showing the construction of the. having a common inlet adapted tobe operatively connected with a source of heat when the plane is stationary. » ` 30 A particular feature of this invention is found ' heater combustion chamber; Fig. 10 is a sectional view taken along the line Ill-_I0 in Fig. 7; Fig-.11 is a side elevational view of another inthe provision of a portableheating unit in modified form of the invention; f cluding a heater of internal lcombustion type - Fig. 12 is an end elevational view as seen look operated in conjunction with an internal com bustion engine which is light in weight, and com 35 ingtoward the right in Fig. 11‘; ' posed entirely of preassembled parts compactly and conveniently arranged, but 'individually re.-- Fig. 13 is a sectional view taken along the lineV I3-I3 in Fig. 11; and » . ‘ , Fig. 14 is a modiñed form of the heating unit movable from the unit to facilitate work on the shown 1n Figs. 11-13. _ i l unit_ With the unit parts of a preassembled con In the practice of this invention there is pro strurtion a complete part can be carried for re 40 vided a portable self-contained air heating unit placement purposes so that the unit may be oper comprising a heater _of internal combustion type ated with but a minimum of lost time. adapted to be operated entirely in_conjunction ' Anoth'er feature of this invention is found in the provision of a duct system for carrying heated with an internal combustion engine. The heater air to the engines and cabin of an airplane which 45 and the operating engine therefor are carried on a carriage or like portable means with the heater - l is carried in the leading edge of the airplane extending longitudinally of the carriage and thek wings and provided with a commonoutlet for engine disposed laterally to one side of the > operative connection with a source of heat when heater.V A fuel tank for supplying fuel to both the plane is stationary. In flight means-are pro vided for covering the inlet so that the heat de 50 the heater and the engine is arranged laterally to the same side of the heater as the engine and veloped by the engines is fed through the ductv in substantial alignment with the engine on an system to provide a de-icing action at the lead ing edge of the Wings. 1 A Further objects, features and advantages of A this invention will become apparent from .the fol axis substantially parallel to the longitudinal axis of the heater. The longitudinal length of the complete heating unit is de?ned substantially~ 2,412,088 ' 3 ~ j of the conditioning unit 39 extends into the air by the longitudinal length`> of the heater so that the unit is capable of being compactly and con chamber I6. vThe housing member 4I is ~con structed of a high heat conducting material and includes an air and fuel mixing chamber 43a veniently assembled in a relatively small space. The engine «includes a fan mounted on the crank shaft thereof to provide air> for burning in the heater andair for circulating through a passage in the heaterv arranged in thermal relation with the heater1 combustion chamber. The engine and fan assembly, the heater, and the fuel tank are separately removable from the portable means as preassembled units to facilitate assembly and' service work on the heating unit. at the closed end thereof, and an equalizing chamber 44 adjacent thereto, the mixing cham rated-by ber 43a and a heat equalizing conducting chamber partition 44 being plate sepaf-> 46 Í having perforations 41 over the >upper portion thereof. The equalizing chamber 44 in turn is separated from the combustion passage 34a by a heat insulating plate 48 having perforations 49 arranged peripherally therein. Positioned axial ' With reference to the drawings, one form of the heating unit of this invention is shown in Figs. 3 and 4 as including a burner or heater I0 of internal combustion type, an air cooled inter nal combustion engine I I and a fuel tank I2 coin mon to the engine and heater. These three parts ly through the housing member 4I and supported ' y in the housing end 42, and partition plates 46 and 48 is a heating element or conduit portion 5Iv having an inlet end 52 extending from the'hous- ' ing end 42 and an outlet portion 53 projetcing outwardly from the open housing end 43 into the - are mounted on a common sled orportable sup porting member I3, but individually secured thereto; securing straps I8' and I2' being used for the heater I0 and tank I2, respectively, while 20 combustion passage. 34a. . Arranged in a spaced concentric relation about ' the base (not shown)y for the engine II is sup extends into the air chamber I6 is a conduit por that' portion of the housing member 4I which tion 54 in sealed engagement at one end 56 with _The'heater I6 is comprised of a substantially 25 thebase `portion 2I of the member 22 and con cylindrical housing member I4 having a combus nected. at its opposite end 51 with an exhaust conduit 58 from the internal combustion engine tion chamber I5 and an air chamber I6 therein. The combustion chamber I5 has a tubular outer II. The annular space formed 4within the con duit 54 and about the housing member '4I of the wall I1 closed at one end by a cover plate I8 and at its opposite end I9 by the base >portion 2| 30 fuel conditioning unit 39 is divided 'into con of a substantially cup-shaped member 22 which K nected passages 45, 50, and 55 by a substantially L-shaped bafile plate 59a adapted to direct the defines the air chamber I6. The open end of ‘exhaust gases entering the conduit 54 from the the member 22 is closed by a cover or end plate exhaustpipe 58 to travel axially in one direction 23 for the housing member I'4. Thus as is evi dent from Fig. 3 the air chamber- I 6 and combus 35 of the conduit 54 to the end'56 thereof, and then ported directly on the sled -or base member I3. tion chamber I5 are in alignment axially of the housing I4 and separated from eachother by the base portion 2 I of the cup-shaped member 22. These two chambers are spaced from the , heater housing I4 by ñns 24 angularly spaced about the combustion chamber I5 and extending axially thereof, to provide an annular passage 26 about the chambers I5 and I6 (Fig. 5). . An in let 21 to the passage 26 is at one end 25 of the housing I4 and an outlet 28 therefor is at the' housing end 29. As shown in Figs. 3 and 4 the housing end 29 is of substantially bell shape and adapted for releasable connection with a flexible air conduit 3| for conducting the heated air to a source remote from the heater. V tion chamber I5 and is retained therein in an assembly position by welding or like means to the shaped member 22. into the combustion passage 34a. As indicated by the arrows in Fig'. 6 this directed flow of the exhaust gases occurs by virtue vof the gas passing successively through the passages 45,56 and 55 and thence into the inlet 52 of the heating ele ment 5I. Since the housing member 4I, parti tion plate 46 and heating element 5I are' con structed of a material having high heat con-' ductivity, the heat from the engine exhaust gases passingv about- the housing 4I is readily trans ferred to the heat conditioning yunit 39 for a pur Thev fuel conditioning unit 39 is provided with The combustion chamber I5 (Figs. 3 and 5) is divided into 'four axially extending passages 34a-_34d by' a partition member 36 of substan tially X-shape and of a construction providing for the connecting of such four passages to form a. single serpentine passage. The partition mem ber 36 is coextensive in length with the combus 60 fins 24. By virtue continuous passage I5, the inlet 31 and both located in- the of the heating element 5I, from where it is dis charged through the heating# element outlet 53 Air to be 50 ` pose now to be explained. heated is circulated through the passage 26 by a. fan 32 mounted on the engine crankshaft 33 aswill be later described. ' axially in an opposite direction into the inlet 52 of this construction of the in the combustion chamber outlet 38'of the passage are base portion 2Il of the cup an inlet 6U at the closed end 42, thereof, in which is positioned an air and fuel nozzle 59. As seen from Figs. 5 and 6' the nozzle 59 hasl one end 65 thereof extending through the conduit 54 into the air chamber I6. The end 65 of the fuel nozzle 59 is connected through a pipe 6I with a fuel pump 62 operatively supported on the engine II, and in fluid connection with the fuel tank I2 through pipe 63. The pump 62 is common to both ' - theengine II and heater I0 so as to supply fuel to both thereof during-the normal operation of ` the heating unit. The fuel from the nozzle 59 is introduced into the mixing chamber 43 of the _fuel conditioning unit 39 together with combus tion «air from the air chamber I6, this air for ' combustion being admitted into the fuel nozzle through ports 64 in the end 65 and` through tubes Located within the air chamber I5 and at the 66 arranged about the inlet 60 and connecting the inlet 31 to the combustion passages 34a-_34d is a fuel conditioning unit (Fig. 6) designated gen 70 mixing chamber 43 with the air chamber I 6. 'I‘he erally as 39 and including a substantially tubu fuel thus admitted into the -mixing chamber 43 lar shaped' housing 4I closed at one end 42 and is vaporized therein for mixing together with the open at its opposite or outlet end 43 for fluid con air, the vaporous mixture passing through the apertures 41 in the partition plate 46 into the nection with the combustion chamber passage 34a. As is evident from Fig. 6 the greater part 75 equalizing chamber 44 from where it is discharged . 2,412,088 5 ~ . . - 6 ‘ through the apertures neat insulating plate u embodiment, as determined by the combined di into the combustion passage 34a. This vaporous mensions of the heater I0 and engine II laterally of the heating unit is twenty-four inches. 'I‘his mixture is mixed with the exhaust gases from embodiment includes an internal combustion en the heating element outlet 53 for burning there with in the combustion chamber I5, combustion> Ul gine rated at about one horse -power'and a half, with the heater and engine having a> fuel con being initiated by spark means S .positioned in the combustion chamber passage 34a. and con sumption during a run of >one hour under'full Ü nected in operative association with the engine load conditions of 2.3 gallons. The fuel tank I 2 is relatively large‘for an engine of this size and has magneto (not shown). Supplementary air `for .combustion is supplied through ports 10 connect 10 a capacity of about 8 gallons. The fan 32 is ca pable of delivering about 1100 cubic feet per min ing the passage 34a with the air chamber I6, and tubes 15 connecting the passage 34e with the - chamber I6. The gases from combustion are. exhausted from the combustion passage outlet ute from the heater outlet 28 when running at a speed of about 3600 R. P. M., the _temperature of the heated air at the outlet 28 during normal op-v 38 into the tail pipe assembly 1K6V for discharge 15 eratingconditions being about 140° C. Theen tire weight of the complete heating unit includ from the heater. .The air for combustion is supplied to the air chamber |6 by the fan 32, which, as previously mentioned, also supplies the al1` for circulating ing the base I3 does not exceed 270 pounds so that the unit can be moved about rather easily by one man by sliding the base I3, The relatively solid- through the passage 26. As is seen from Fig. 5 20 assembly arrangement of the heater I0, engine the housing/or scroll 61 for the fan 32 is provided _ with an inlet 68 and an outlet or mouth 69. 'I'he inlet 1| (Fig. 4) to the air chamber I6 is posi tionedwithin the inlet 21 lto the annular passage 26, with the mouth 69 of the fan housing 61 being movable within the inlet 21 to the passage 26 and releasably connected therewith. By virtue of’ this , construction the air delivered by the fan 32 is divided so that a portion thereof is supplied t0 theair chamber I6, and the remaining portion circulated through the annular passage 26,` The housing 61 and fan 32 are preassembled with the II and fuel tank I2 adapts the heating unit for installation in >a minimum of space, the low height of. the unit providing for a low center of gravity which increases the ease with which the unit can be handled and moved about without danger of tipping over, and also» serves to retain the unit more rigid during its operation so as to reduce excessive vibration thereof. The portability of the heating unit under some 30 conditions of its operation, such as where .it is utilized for the heating of airplane engines, may be facilitated by providing the base I3 with engine II so as to be movable therewith as a wheels |20 (Figs. 3 and 4). ' The wheels |20, a unit, The heater or burner |0 is completely pre assembled independently of the engine and fan pair of which is illustrated, may be lrubber-tired and are rotatably supported at the end |2I of the assembly, and tank I2, with each of these three pre-assembled units being separately secured to base member I3 on mounting means including a bracket or brace |22 having one portion thereof the base member I3, as above described. Since secured to the base member I3, and the other vthe connection of the fan scroll 61 with the air „portion | 23 thereof extending outwardly from inlet portion 21 of the heater I0v is accomplished 40 the base end |2| in a direction inclined upwardly equally> well regardless of whether the outlet from the longitudinal plane of the base mem 69 is inserted Within the inlet 21, or the inlet 21 ber. The longitudinal extent of the portion |23 is ñtted about the outlet 69, each partmay be is proportioned relative to a corresponding wheel removed from the base I 3`independently of the |20 such that the wheel is lifted above the ground, other to facilitate assembly and service work on when the base member is in a horizontal posi the heater. tion. In other words the wheel is in substan From a consideration of Figs. 3 and v4 it is tially a clearlng‘lposition relative to the ground seen that the burner I0 is positioned longitudi when the heating unit is being slidably moved nally of the base or supporting member I3 with about on the base member I3. By virtue of this the engine and fan assembly disposed laterally 50 assembly the wheels |20 are fixedly retained in j to one side and at the end, 25 thereof. The an operating positionvso as to be constantly ready fuel tank I2 is arranged laterally to the same When sliding of the heating unit on the _ ' for use. y side of the heater I0 and in alignment- with the sled or base member I3 beco'mes inconvenient engine Il on an axis substantially parallel to the or difficult the heating unit may be wheeled about longitudinal axis of the heater I0. This ar on'the wheels |20 by simply raising or lifting rangement of the heater |0, engine II, and fuel the base end |24, a handle |26 being provided for tank I2 provides for a compact assembly of the this purpose. The handle |26 is of substantially heating unit in a confined space, the height and U-shaped configuration with the legs |21 there length of which is determined essentially by the of being slidably supported in brackets |28 so as height and length of the heaterl I0 and the width 60 to be extensible from the -base member. Stop ' by the combined dimensions of the heater I0 and portions |29 at the Afree end of each leg member engine il laterally of the heating unit. Since I21- prevent the handle |26 from being pulled the engine shaft 33 extends parallel with the lon- ' out of operative _connection with the base member gitudinal axis of the heater I0, the fan. 32 for I3. On lifting of the base member end |24 the the heater I0 and fan unit 11 for coolingv the 65 wheels |20 are lowered into engagement with the engine |I are also positionedy in alignment on an ground, with the continued raising of the base axis substantially parallel to the longitudinal axis member resting the entire weight of the heating of the" heater I 0, with the two fans 32 and 11 and - unit on the wheels. The lifting Aand lowering of 'A exhaust conduit 58 all being` arranged within the the base member end |24 is accomplished with the wheels |20 functioning as a pivot point so dimensions of the base I3. In one embodiment of the invention the overall heightof the heat that the unit is gradually lifted and lowered to ing unit is less than 15 inches'and of a length completely eliminate any sudden dropping there not exceeding four feet, these dimensions defining of. The heating unit is thus capable of being substantially the corresponding dimensions of slidably moved about on the base I3, or wheeled ' the heater I0. The transverse dimension of this about on the wheels |20 with equal facility since 2,419,088 7 Y 8 flning walls for the air circulating passage 28'. The combustion chamber I8' (Figs. 9 and 10) is divided longitudinally by partition members 88 both manners of moving the unit are equally available for use.' A heating unit of the type described is illus vtrated in Fig. 1 applied to the heating of air plane engines for starting purposes. The air into four passages 8|a-8Id which are inter connected to provide a continuous pe through the combustion chamber i5'. These pas sages are, of a size to provide for the use of a plane is shown as including a fuselage 18 having wings 18, with each wing 18 carrying a pair of engines-88 and 8| thereon enclosed by a cowl 88. The plane cabin 82 is disposed between the pair of inlets 31’ leading to the passage 8|avand 82 and at the leading edge of each wing 18, the opposite ends of the duct terminating substan tialLv atthe wing ends the outermost engines 8| within a corresponding cowl 88. As is clearly 15 respects to the Vunit 38 fully described above in connection with Fig. 6. In turn, each outlet 88' is provided with an exhaust tail assembly 18 a pair of outlets 38’ leading from the passage 8|d. wings 18 and in the fuselage 18- in a usual manner. 10 Each inlet 31' is operatively associated with a A duct 83 is positioned transversely of the cabin fuel conditioning unit 38 which is similar in all which-_is similar to the corresponding assembly of Fig. 3. The two fuel conditioning units 38 in the inlets 31' are operated concurrently with only lets 88 and 88 being provided inthe duct 83 at Vone spark S being needed to initiate combustion. ’ the inner engines 88 andouter engines 8 I, respec 'I'he engine Il’ and fuel tank I2' operatively tively. so that the heated air entering the duct 20 associated with the heater i8', are correspond inlet 81 is substantially equally distributed about ingly larger than the like parts in the heating the engines 88 and 8| -within the space defined unit of Fig. 3 but are relatively arranged and op by _their corresponding cowls.~ The inlet 81 is erated in all respects similar thereto. A further ,arranged substantially intermediate the inner description thereof is believed, therefore, to be engines 88 and below the cabin 82 and is adapted 25 unnecessary. Because of the relatively low or shown in Fig. 1 the duct 83 is of a reduced sec tion after leaving the inner engines 88, with out for operative releasable connection with the pancake assembly of the complete heating unit, a heater I8 through the ñexible conduit 3|. This operative connection may be of the usual bayonet type. A duct portion 88 is attached to the duct 88 for carrying heated air into the cabin 82. With the duct system in the plane connecting the engines and cabin, heat is readily supplied - platform or shelf 82a (Fig. 8) may be supported 30 thereto by simply connecting the heater |8 _to the inlet 81. v ‘ above the heater or burner |8'> for supporting a second heating unit or to carry flexible connect ing tubes, such as the tube 3|, for conveying the heated air from the heater outlet to a desired 10 cation remote from the heater. The platform 82a is supported on frame members 83 located about the heater |8’ and extending upwardly » By virtue of the arrangement of the duct'83 in the wings 18 and at the leading edge of such wings, it may be utilized during normal flying operation to provide a de-icing means. Thus 35 from the base member |3 to a position above the when the plane is in flight a cover or cap means veniently positioned thereon without being too heater I8'. By virtue of the flat assembly of the heating unit, the platform 82 is relatively low. » so that a second heating unit can be very con |8| (Fig. 2) having pins |32 for bayonet assem 40 high to operate or service. It is obvious, of course, bly with corresponding slots |33 in the inlet 81, that a similar platform structure is' also applica- l . is positioned over the inlet to plugthe same. Ible for use with'the heating unit of Fig. 3`. With the inlet 81 stopped a portion of the air An arrangement of the heating unit of Figs. l-6 within the cowls 88 heated by the engines is fed with the engine || and i2 in a superposed rela-,_ into the duct 88 to heat the same, circulation tion with the heater I8 is shown in Figs'. 1p1-14. of the air in the duct being accomplishedV by the The base I8’ is provided with a frame structure several openings therein at 88 and 88. ' designated generally as 88 and including upright ‘ ' In Figs. 7-10 there is shown a heating unit which is substantally similar in all respects to the heating unit of Figs. l-6, except for some . changes in the construction of the burner, the corner posts 88. heating unit of Fig. 7 being somewhat larger longitudinally of the heating unit are pivotally‘ supported at 88 and |8|, respectively. between ' corresponding posts 88 for pivotal movement lat- ’ erally outwardly from the unit. Except for the trays 8.1 and 88 the sides and ends of the frame structure 85 are entirely open, a top |82 provid than the heating unit of Fig..2 so that the burner thereof is constructed to provide for a relatively higher output of heated air. Side trays 81 and 88 extending , Similar numerals . ing a cover for the heating unit and functioning of reference primed shall be used, therefore. in Figs. '1-10 to indicate parts thereof correspond also as a'brace for the uprights 88. are a combustion chamber i8' and an air cham completely about the heater |8. The pairs of The outlets ~ ' ~ '28a of the air passage in the heater, three of ing to Figs. 1_6. _ ' which are used in the heating unit of Fig. 11, Referring to Figs.l '7 and 9, the heater or burner are thus readily accessible for operative connec I8’ is seen to include a housing member 88 of 60 tion with flexible conduit means 8|. substantially rectangular form and having an 'I'he heater I8 is secured directly to the base open side 8| which is supported directly on the I8’ by mating gusset plates |88 (Fig. 13) of semi base member i3. Enclosed within the housing 88 'circular shape andladapted together to extend ber I8', these two chambers being of a substan 65 mating lplates |83 are spaced longitudinally of tially rectangular cross-section and arranged longitudinally of the housing member 88 but spaced therefrom by radiating fins 82.- The fins 82 are substantially co-extensive in length with thefcombustion chamber I8' and form- an air circulating passage 28’ thereabout having an in let 21' and an outlet 28’. As is best seen in F18. Y 9 the fins 82 at the bottom ofthe heater I8' serve to space the chamber I8' from the base member "i8 lo that the member i8 forms one of the Icon the heater and in their mating assembly provide supporting legs |88 at the bottom of the heater, and a longitudinally extending platform portion |88 at the top thereof. As shown in Fig. 11 the platform portion |88 at the heater end 28 is adapted to alone support the engine || thereon, with the remaining top' portions |88 serving as supports for the fuel tank l2. The scroll >81 for ` blower or air .circulating fan 32 is\carried directly 75 on the top of the heater at the end 281 thereof. " 2,412,088 ' . ' - 9 . » The scroll 61, thev engine I|,_and the fuel tank I2 are thus positioned in longitudinal alignment laterally ofthe heater I0 and directly thereabove, with the engine II located between the scroll 61 - and the fuel tank I2, but with all of these parts . ~ . 10 for operating the burner, and a fuel tank com mon to both the‘burner and the engine, each of which is of a preassembled construction and adapted for individual mountingon a common . supporting or base member, Assembly as well as servicing Awork is thus appreciably simplified since each of these units is capable of being com pletely checked before being assembled into its confined within the longitudinal length of the heater I0. By virtue of this assembly of the heat ing unit the over all length of the heating unit is relative position in the complete heating unit.` deiined substantially by the'length of the heater I0, while the width thereofI is determined sub 10A Since these unit parts for a particular heating unit are interchangeable, they may be kept` stantially by the transverse dimension or diam in stock» in their preassernbled form so as .to be ` , ~ readily substituted for corresponding parts_ With reference to Fig. 14 the heating unit which require servicing. The hea-ting units are of Fig. 1l is shown with a .platform structure thus adapted for heavy duty service since a part 15 |01, in place of the gusset plates |03, for sup requiring attentioncan be worked on while the porting the engine II and fuel tank I2. The corresponding workable part is in operation.V platform |01 is carried on upwardly extending The overall heating unit is >very compactly ar- y frame members |05 positioned at the ends and ranged and capable of a high heat output‘soas . to each side of the heater I0 and extending to make it particularly applicable for use in heat upwardly from the base I3’ to a position imme ing the engines of transport or bombing planes diately above the heater I 0. The engine4 II ' for starting purposes. It is readily appreciated and fuel tank I2 are -suitably mounted on the eter of the heater I0. platform |01 in alignment on an axis substan that in cases of emergency, the engines must be heated in a minimum _of time and by means tially parallel to the longitudinal axis- of the heater I0, the engine I I Abeing positioned between 25 capable of being quickly and easily -moved about under all Weather conditions. This ease of han the fuel tank I2 and the fan scroll 61 which is -dling is accomplished in the unit by the provision supported directly on the heater I0. of lboth vsled and wheel means which are equally As previously mentionedl side trays. 91 and 98 available for use. The heating unit of this inven are extended longitudinally of the heating unit and pivotally supported from the uprights 96. 30 tion is entirely complete within itself and its operation is initiated concurrently with the oper The trays 91 and 9_8 in their open positions, as -ation of the internal combustion engine asso indicated in dotted lines in Fig. >12, are adapted ciated therewith. It is apparent, of course, that to receive therein the ilexible conduit means 3| the heating unit may be retained 4in operation corresponding to the three outlets 28a (Fig. 11i , each yconduit when deiiated being foldable into a 35 While it is being transported or moved about so that it need be started onlyV once regardless of compact bundle. With the conduit means in a the number of engines to be heated or the loca folded condition within a corresponding tray, tion of the planes carrying these engines. the trays are closed against the heating unit so Although specific reference has been made to as to appear as a side thereof, as shown in full lines in Fig. 12. The flexible conduits are thus 40 the use of this invention for heating airplane engines. it is to be understood that this is only completely out of the way when the heating one application thereof, and that the heating unit is to be transported or moved about, and unit may be satisfactorily used for the -heating immediately available simply by the pivotal mov of cabins, tents, and auto trailers or the like. ing of the trays laterally outwardly from the Further, although the present invention has heating unit. v been described with speciiic reference to several The maneuverability of the heating unit for all preferred embodiments thereof, it is to be under ` weather conditions is facilitated by the provi stood that it is not to be so limited since changes sion of collapsible or folding wheels |08 which are operatively mounted on the sled member I3’` Y can be made therein which are within the full substantially intermediate the ends thereof. 50 intended scope of this invention as defined by the When the wheels |08 are not in use they are adapted to be >folded to a> position indicated by dotted lines in Fig. 12 above the base member I3’ and to opposite sides of the heater I0. They are thus removed entirely Within the confines of ' appended claims. I claim: , ‘ ' _ I 1. A portable air heating unit having a base member for supporting a burner of internal com bustion type and an internal combustion engine for operating said burner, a fuel tank common to said burner and engine, housing means for said burner having therein a combustion chamber and the frame structure 95 whereby to increase the ease in handling the heating unit for moving'it about on the base or sled member I3'. When a passage for the air to be heated in thermal re the wheels |08 are in an operating position the heating unit is maintained substantially level bv 60 lation with said combustion chamber, said hous ing means having a length substantially equal to the provision of a pivotal end support or foot. |09 the longitudinal length of said base, means driven pivoted to the sled member I3' at III. As shown by said engine for supplying fuel from said fuel in Fig. 11 the foot member |09, is pivotally mov tank to said combustion chamber and engine, able in a counter-clockwise direction to its dotted line position on the top of the sled memberv I3'. 65 air moving means operatively connected with said In its unit supporting position the foot member engine for supplying air to said combustion cham ber and air passage. means operatively associated |09 is moved to its full line position and retained therein by a clip member II2 secured at its end with said combustion chamber for vaporizing the fuel supplied'thereto for mixing together with I I3 to the base member I3' and open at its oppo site end I I4 to provide a slotted recess for receiv vthe air for combustion, and conduit means for the exhaust gases from .said engine arranged in ing the foot |09. . thermal relation with said fuel vaporizing means From a consideration of the above description and drawings. it is seen that the invention pro to heat the same, said engine and fuel tank being positioned in substantial alignment on an axis v vides a portable self-contained heating unit eom posed of a burner an internal combustion engine substantially parallel to the longitudinal axis of ' ~ 2,412,088 . . 11 ` said housing means and being confined substan ‘with an internal combustion engine, common sup porting means for said engine and burner, a ing means. ` housing member for said burner having a com 2. In a self-contained air-'heating system in bustion chamber therein and a passage for air cludingv means providing for its portability, a fil to be heated arranged >in a thermal relation with heater of internal combustion type having a said' combustion chamber, means for supplying length substantially coextensive with the length fuel to said engine and combustion chamber in of said portable means, an internal combustion cluding a fuel tank carried on said supporting engine for operating said heater, a. fuel tank com ‘ means, air moving means in driven connection mon to said heater and internal combustion en with said engine, and means dividing the flow gine, said heater having a passage therein for of air from said air moving means to said com air to be heated, means driven by said engine and bustion chamber and said air passage, means tially within the longitudinal length of said hous fluid -connected'with said tank for supplying fuel supporting said air movingmeans, fuel tank, and to said engine and heater, air moving means op engine in substantial alignment laterally to one erated by said engine for circulating air to be- 15 side of said‘ burner, with the longitudinal length heated through said passage and supplying air and vertical height of said unit being defined for combustion to said heater, means in said substantially by the corresponding dimensions of heater for vaporizing the fuel supplied-to said said burner, and the dimensions of said engine heater for' mixing together with said combustion and fuel tank laterally of said burner being sub air, with said engine and fue1 tank being po'si tioned in substantial alignment on an axis sub stantially parallel to the longitudinal axis of said, heater, and means supporting all of said heater, -engine, fuel tank and air moving means sub stantially within the dimensions of said portable means. 3. A unit for heating air including a longitudi nally extending heater >of internal combustion type adapted for operation in conjunction with stantially equal so as to provide for a substan- ' tially uniform width of saidunit over the complete length thereof. < 6.' A unit for heating air including a burner of internal `combustion type Aadapted to be operated in conjunction with an internal combustion en gine having a fuel tank and conduit means for ' exhaust gases, a housing member for said burnerv having therein a combustion chamber and an air passage arranged in thermal relation with said an internal combustion engine having a fuel tank, 30 combustion chamber, said engine and fuel tank said heater including means defining a combus being disposed laterally to one side of said hous tion chamber. said enginev being disposed at one ing, means- supplying fuel to said combustion end of said heater and said fuel tank being dis chamber from said fuel tank, air moving means posed at the opposite end of said heater, means operated by said engine for delivering air to said supporting said engine and tank in` alignment on combustion chamber and air passage, heat trans an axis substantially parallel to the longitudinal fer means in said housing member adapted to axis of said heater and substantially within the utilize the exhaust gases from said conduit means _ longitudinal length thereof, said heater includ « to prepare the air and fuel supplied to said com ing‘means defining a passage for air to be heated bustion chamberv for burning therein, means for arranged in thermal relation with said combus 40 carrying the exhaust gases in said conduit means tion chamber, aix'- moving means operatively con» into thermal relation with said fuel preparing nected with said engine for circulating air through means, and portable means for said unit includ said passage.'conduit means fluid connecting said ing a mounting member adapted to carry said en ' air moving means and said air passage, means gine, burner and fuel tank in their above-de in said conduit means for by-passing a portion fined relative positions, with the longitudinal di of the air delivered by said air moving means to mension of said mounting member being deñned . said- combustion chamber, andmeans for supply substantially by -the length of said housing mem ing fuel to said combustion chamber-'and engine ber, and the lateral dimension of said mounting . from said tank including fuel moving means com member substantially by the combined dimen mon to said heater and engine and operatively sions of said housing member andengine laterally connected with said engine. of„said unit, with said fuel tank, housing mem; 4. A system for heating air including a burner ber and engine all being confined within the di of internal combustion type adapted for opera mensions of said mounting member and within tion in commotion with an internal combustion a verticaldimension defined substantially by the engine land operatively assembled therewith on vertical height of said housing member. a common mounting means for transportation 7. An air heating system having a burner of as a unit, a housing member for said burner hav lng a combustion chamber therein and an air ~passage arranged in thermal relation with said internal combustion type and adapted for-` opera- ' . .tion in conjunction with an internal combustion , ' by said engine for delivering air to said burner and air passage, a fuel system for said burner and engine including `a fuel tank carried on said mounting means and pumping means operatively positioned against said base member, a combus tion chamber within said housing means spaced engine. a portable base member adapted to carry combustion chamber, air moving means operated 60 said burner 'and engine, housing means for/said burner having the lower side> thereof open and , from said base member and housing means to " supported on said engine, means-supporting said 65 form an‘air passage, means operated by said en fuel tank, engine and air moving means in align--_ gine for supplying air to said combustion cham? ment to one side of said housing member and ber and air passage, a fuel system for said burner within the distance defined substantially -by the and engine including a fuel tank, and means sup longitudinal `length of the housing member, with“ porting said engine and fuel tank in substantial .l the vertical height.v of said transportable unit " alignment between opposite ends of said housing being defined substantially bythe vertical height means and'on an axis substantially parallel with vof said housing member. the longitudinal axis of said housing means. y 5. A portable air heating unit- including a lon- . _ 8. An air heating unit including portable means gitudinally extending burner ofßinternal combus for carrying a burner of internal combustion non type adapted for _operation in conjunction 75 l type and an internal combustion‘engine opera 1 2,412,088 ' 13 ç _ tively associated with said burner, with said burner being of a preassembled construction and including a housing member having therein a combustion chamber and a passage forv air to be _ 14 . - 10. A portable air heating unit including a heater of internal combustion type operated solely by an internal combustion engine, said heater having a combustion chamber and a passage for air to be heated thermally related with said com heated arranged in thermal relation with said' bustion chamber, a basev member for supporting combustion chamber, air moving 'means opera said heater, frame means secured to said base tively connected with said engine for delivering member and extending upwardly therefrom about aix' to said combustion chamber andl air passage, said heater, a mounting member carried on said a fuel system for said engine and burner includ frame means above said heater for supporting 10 ing a fuel tank mounted on said portable means and full moving means operatively supported on , said engine, a Vfuel tank common to'said heater and engine supported on said mounting member, said engine, said air and fuel moving means being air moving means operatively connected 'with said preassembled‘with said engine, and said engine engine for supplying air to said combustion cham and fuel tank being disposed laterally .to one ber and air passage, and means _for supplying fuel side of said burner, and means for independently ß to said engine and heater from saidfuel tank securing said burner, eng1ne,'and fuel tank on operatively supported on said engine, with said said portable means so that each of said three fuel tank, engine and air moving means being lparte'. is separately removable >from said port arranged Y substantially within -the longitudinal able means, y 9. A portable air heating unit including a heater 20 length of said heatenand said base member and mounting member being substantially co-exten of internal combustion type operated in conjunc y sive in lens-th with said heater. ytion with an internal combustion engine, said 11. A heating system including a longitudinally heater having a combustion chamber and a pas \ sage for air to be heated thermally related with said combustion chamber, a supporting member for said heater, a fuel tank common to said en»` extending burner and a power unit, said burner being 'of the internal combustion type' and adapted for operation in conjunction with said power unit and _operatively assembled therewith on common mounting means for transportation as a unit, said burner having a combustion chamber there ing means being spaced longitudinally of said heater with each thereof having a portion posi 30 in, means forming a passage for air to be heated arranged about said combustion chamber, and‘in‘ tioned at the top of said heater, with at, least heat conducting relation therewith, a fuel supply one of said top portions serving as a support for gine and heater, a plurality of means for securing ' said heater to said supporting member, said secur system including a fuel tank and means operated _ said engine, and at least another of said top por by said power unit ‘for delivering fuel to said com tions serving as a support for said tank, air mov bustion chamber, air moving means operated by ing means operatively connected with said engine said power unit, means for dividing the flow of >for supplying air to said combustion chamber and _air from said air moving means to said combus air passage, and means for moving- fuel to said tion chamber and said air passage, and means engine and combustion chamber from said fuel supporting said airmoving means, fuel tank and tank~ operatively supported on said engine, with said fuel tank, engine and air moving means being 40 power unit in substantial alignment on an axis substantially parallel to the longitudinal axis of confined substantially within the longitudinal said burner and substantially within the longi length of said heater, and said heater defining lLtée longitudinal length of said supporting mem l'. , tudinal length thereof. ' ' v , HARRY B. HOLTI'HOUSE.