US1363530A - Combined steam and hot-air generator - Google Patents

Description

B. A. PHILUPS. COMBINED STEAM AND HOT AIR GENERATOR.

v APPLICATION FILEDYFEB. H, 1919. 1,33 5%, Patented Dec. 28 1920 5 SHEETSSHEE| 1.

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INVENTOR ATREY B. A. PHILLIPS.

COMBINED STEAM AND HOT AIR GENERATOR.

APPLICATION FILED FEB. 11, 1919. v 1,863,539, Patentefi Dec. 28 R920 5 SHEETS-SHEEI 2- B. A. PHILLIPS. I COMBINED STEAM AND HOT AIR GENERATOR.

APPLICATION FILED FEB. H. 1919.

Patented Dec. 28

B. A. PHILLIPS. COMBINED STEAM AND HOT AIR GENERATOR.

APPLICATION FILED FEB. II, I919.

Patented Dec. 2%,, M2&

5 SHEETS-SHEEI 4.

INVENTOR B. A. PHILLIPS. COMBINED STEAM AND HOT AIR GENERATOR.

19895305 APPLICATION FILED FEB. 11, I919- 5 SHEETS-SHEET 5- BEACE A. EHILLIPS, 0F PHILADELPHIA, PENNSYLVANIA.

COMBINED STEAM A1113 HOT-AIR GENERATOR.

Specification of Letters Patent.

Patented Dec. 28, 1920'.

Application filed. February 11, 1919. Serial No. 276,285.

9 b all to hem. it may concern:

it known that I, BRAUE A. PI-rrLLIrs, a citizen ot' the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Combined Steam and Hot-Air Generators, of which the following is a specification.

it is well known that a great amount of the fuel used in furnaces for heating purposes is wasted for the reason that a large portion ot the heat value of tie fuel passes up the chimney; the furnaces being so construt-ted as to be incapable oi absorbing the heat from the fuel as it passes from the tire box to the chimney.

tine object of my invention is to provide heating means which will be so constructed that pr. ctically all of the heat value of the :tuel used therein will be utilized and transmitted for the purpose desired and thereby prevented from passing. unconsumed, up the chimney.

Another object is to so design and ar align the parts of my invention that they can be easily and quickly assembled and put togg'ether.

.inother object is to so construct my invention that it will be durable and opera tive to produce an even and steady degree of heat.

Another object is to so construct and arrange the parts oi my invention that they can be readily cleaned or removed for purposes of repair or replacement.

These objects, and other advantageous ends which will be hereinafter described, I attain in the following manner, reference being had to the accompanying drawings in which Figure 1 is a side elevation of my improved combined steam and hot air generator,

big. 2 is a top plan view of Fig. 1,

Fig. 3 is a sectional. elevation taken on the line 3-3 of Fig. 2,

Fig. l a sectional plan view taken on the line 4-& of Fig. 3,

Fig. 5 is a fragmentary section taken on the line 55 of Fig. 4; and drawn on an enlarged scale,

Fig. 6 is an enlarged sectional view through certain of the elements of my invention and taken on the line at of Fig. 2,

7 is a fragnoent-ary elevation. showing certain damper operating apparatus which forms a part oi my invention,

Fig. 8 is a side view of Fig. 7 and Fig. 9 is a fragmentary elevation, partly in section, showing certain other portions of the damper controlling apparatus.

Referring to the drawings, 10 is a metallic base which is provided in its front portion with a rectangular ledge 11 upon which rests a boiler 12 into which water is fed through a pipe 13. The boiler 12 is provided on its interior with a metallic box 14, said box extending upwardly and stopping short of the top 15 of the boiler, as clearly shown in Fig. 3. The box 14 is of less cross section than the interior of the boiler 12 and, therefore, provides a space around the entire box. Tubular portions 16, 17 and 18 extend from the box 14 outwardly and provide passageways 19, 20 and 21 communicating with the interior of the box 14:. Hollow grate bars or tubes 22 extend entirely through the box let between the passageways 20 and 21. The grate bars are welded or otherwise secured within the box 14: and the open ends of the grate bars communicate with the water spaces forward and rear of the box let, so that the water within said boiler fills the grate bars. Thus, the passageway 20 pro vides an outlet to permit the removal of olinlrers and the passageway 21 permits the removal of the ashes and serves for draft purposes, as will be hereinafter described.

The portion of the 'boX above the grate bars 22 serves as a fire box and combustion chamber 23; the passageway 19 serving to permit fuel to be inserted within the fire box.

Two sleeves 2 1 and 25 (see Figs. 3 and 4) extend entirely through the sides of the boiler 12 and box 14 and provide passageways 26 and 27 which communicate with the combustion chamber 23 for draft purposes, as will be hereinafter described. In similar manner. two other sleeves 28 and 29 extend through the rear of the boiler 12 and fire box 14 and provide passageways 30 and 31 for direct and indirect draft. The passageway 30 communicates with the combustion chamber 23 above the fuel 32, while the passageway 31 communicates with the box 14 below the grates 22.

The boiler 12 has a plurality of water tubes communicating therewith, said water tubes having upright portions 34 Space 36, above the water level 37 in the boiler 12, serves asa steam space or reservoir and steam pipes 38 and 39 extend thrormhthe to. and communicate with the space 86.

A casing 40 surrounds the boiler 12 and between this casing and the boiler is interposed a lining all of asbestos or other heat insulating material. The front plate 42 of the casing d0 has holes therein in alinement with the doorways 19, 20 and 21, and this plate l2 forms a supporting structure 101 doors 43, l4 and 45 for closing the pa. sageways 19, 20 and 21 respectively. The side plates 46211101 47 of the casing 420 are spaced from the sides of the boiler 12, as shown at 18 and 1-9. Thus, the passageways 26 and 27 communicate with the spaces 48 and l9 respectively, as shown in The side plates 46 and 47 have openings 50 and 51 which respectively communi ate with the spaces 48 and 49. These openings 50 and 51 are adapted to be closed by doors 52 and 53 which are hinged to the plates 46 and 47, the hinges being so arranged. as shown in Fig. 1, that the weight of the doors normally close said latter openings.

An intermediate plate 54: has an aperture 5 through which the water tubes extend, said plate 54 resting on a ledge 56 formed on the rear of the base 1.0. Two side plates 57 and 58 and a rear plate 59 form an extension of the casing l0 and these plates rest upon the ledge 56, as shown in Fig. 3. A cover 60 is removably mounted on the top of the plates 57 58 and 59 and hot air pipes 61 extend through the cover 60 and communicate with the space 62 between said latter mentioned plates.

Two inner plates 63 and 6d are spaced from the plates 57 and 58 and together with the top and bottom plates 65 and 66 provide a hot air drum 67. Tie rods 68 extend through. the hot air drum 67 and are secured at their opposite ends to the intermediate plate 54 and rear plate The base 10 has an opening 69 directly under the bottom plate 66 and this opening 69 extends laterally of the base and coinmunieates with an opening 70 in which is positioned a large pipe 71 which is r etangular in cross section, said pipe-leading to the atmosphere and adapted to conduct fresh air to the space 72 below the bottom of the plate 66.

Flue tubes 73 are arranged in staggered position and extend through the hot air drum 67 and, through the top plate 65 and.

bottom plate 66. The opposite open ends of the flue tubes 73 respectively communicate with the spaces 72 and 62. The upper ends of the flue tubes 73 are flanged at 7 1 and gaskets 7 5, preferably gt a resilient material, are interposed between the flange and the top slate 65 so as to prevent leak-- age of any of the gases of combustion into the space 62. The lower ends of the flue tubes 73 are screw threaded and provided with nuts 7 6; there being gaskets 77 interposed between the nuts 76 and the bottom plate 66 to form a seal to prevent gases from the hot air drum 67 from passing into the space 72. The edges of the top plate 65 and bottom plate 66 abut resilient strips 79 and 80 to form a seal and thereby prevent said gases of combustion from passing from the drum into the spaces 62 and 72 at the edges of said latter plates.

, A. water tank 81 is positioned within the space 62 and rests upon lugs 82. Water can be supplied to the tank 91 by means of a pipe 83 and an overflow pipe 84 is provided within said tank, as shown in Fig. 3. The water within the tank 81 serves to moisten the heated air within the space 62 prior to passing upwardly through the pipes 61.

A. sleeve 85 extends and provides opening through the rear plate 59, said sleeve having-an angularly disposed outer edge 6 The sleeve 85 extenos inwardly and forms a mounting for a pipe 87, said pipe being made in telescopic sections 88 and 89 to permit expansion without disengagement. The tor-ward end of the pipe 87 is secured to a flange 90 which provides an opening 91 in the intermediate plate 54- in alinement 'ith the direct draft passageway 30. The sleeve 85 extends into a draft box 92 in which is pivotally mounted an arm 93 having a damper 9 1 pivotally connected thereto, and said damper, by movement of the arm 93, can be moved into engagement with the edge 36 of the sleeve 85 so as to close the opening through said latter sleeve, or the damper can be moved to close an opening 9:) in the draft box 92 which is in alinement with an indirect draft pipe 96, the bottom of said pipe 96 communicating with an opening 97 leading into the hot air drum adjacent its bottom.

The rear plate 59, adjacent the top oi? the hot air drum 67, has an opening 98 which is in alinement with a pipe 99, the latter being made in telescopic sections and communicating with the indirect draft pipe 96 between the opening 97 and the draft box 92. An outlet dra'lt pipe 100 communicates with the top of the draft box 92 and includes an elbow 101 which can be connected by a pipe, (not illustrated), with the chimney.

The steam pipes 38 and 39 communicate with ducts 11.02 and 103. respectively, in a turbine casing 10 These ducts are adapted to conduct the steam from the pipes 38 and 39 and cause it to impact with angularly disposed vanes or blades 105 on a turbine wheel 106 (see Fig. 6). The turbine wheel 106 has a depending shaft 107 which leads into a fan casing 108. A fan 109 'is connected to the shaft 107 and rotates within the casing 108. An arm 1'10 is securedto the bottom of the fan casing 108 and supports an adjustable screw 111, the latter having a recess 112 in its upper end which provides a step bearing for the lower end of the shaft 107.

The steam, under pressure, passing upwardly through the pipes 38 and 39, causes the turbine wheel to rotate, by impacting with the angular vanes or blades 105, and the fan 109 is thus rotated. This rotation of the fan causes an air suction to be taken into the casing 1.08 through an opening 113 in the bottom of said casing 108 and causes the discharge of that air, under pressure, through a pipe 114 which leads from the fan casing into the elbow 101. The portion of the pipe 114 whiehextends into the elbow 101 is tapered to provide a nozzle 115 and the air, under pressure, is delivered into said elbow above the draft box 92 and at an angle to the upright portion of the outlet draft box 100.

The plates 57 and 63 have openings 116 which are in alinement and communicate with the interior of the hot air drum 67 to permit cleaning of said drum between the flue tubes 73. These openings are normally closed by a door 117 which'is hinged to the outer plate 57. The plates 57 and 63 also have openings 118 which are in alinement with each other and which communicate with the interior of the hot air drum 67 at a position between the water tubes 33 and the intermediate plate 54. The openings 118 are slightly above the level of the openings 116 and are normally closed by a door 119 hinged to the outer plate 57.

A shaft 120 extends entirely through the casing 40 and at its opposite ends, outside of said casing, is provided with levers 1.21 and 121 A hand operated lever 122 (see Figs. 1, 7 and 8) is pivotally secured to the shaft 120 outside ofthe casing 40 and when the hand operated lever 122 is moved forwardly and rearwardly, it will rock the shaft 120 and with it the levers 121 and 121. The lever 121 has two arms 123 and 125. The arm 123 is connected by a chain 124 with the door 52. The lever 121. is con nected by a similar chain 124 with the door The arm 125 is provided with a lug 126 which forms a supporting means for the end of a coiled spring 127 ,the other end of saidspring 127 being fitted arounda lug 128 on the hand operated lever 122. The spring 127 serves to move the handoperaterl lever 122 on its pivot and away from the casing 40. A bracket 129 is secured to the side of the casing 40 and forms a guideway for the upper portion of the hand operated lever 122. The inner side surface of said bracket has two recesses 130 and 131 into either of which a pin 132 on the hand operated lever 122 is adapted to fit when the hand operated lever is in either of two positions. Fig. 1 of the drawings shows the pin 132 in the recess 131 while Fig. 7 shows the pin 132 in the recess 130. It will be noted that the spring 127, by moving the hand operated lever 122 on its pivot, holds the pin 132 into engagement with the respective recesses, so that the hand operated lever will not accidentally move from either of its two positions, as illustrated.

The lever 122 is provided with two slots 133 and 134. A stud bolt 135 extends through the slot 133 and can be secured therein in any position within the length of the slot. This bolt 135 forms a pivot con nection for a link 136, said link at its forward end being pivotally connected to one arm of a bell crank lever 137, which is pivotally supported at 138. The other arm 139 of said bell crank lever is connected by a chain 140 with a shutter 141 which is pivotally connected at its top to the door 45, said shutter being adapted to close an opening 142 in said door.

A stud bolt 143 extends through the slot 134 in the lever 122 and can be secured therein in any position within the length of the slot in a manner similar to the belt 135. This bolt 143 forms a pivotal connection with a link 14.4, said link at its rear end being connected to one arm of a bell crank lever 145, the latter being pivotally con nected to the rear of the casing 40. The other arm 146 of said bell crank lever is pivotally connected with a rod 147 (see Figs. 1 and 9). The rod 147 is slidably mounted through an angular portion 148 of a link 149 and has a head 150 at its front end. A coiled cushion spring 151 encircles the rod 147 between the angular portion 148 and the head 150. The link 149 is connected to an arm 152 on a pivot shaft 153 which is attached to the arm 93 and which extends through the draft box 92.

By rocking the hand operated lever 122, the shutter 141 and the damper 9-1 will be simultaneously operated. Thus when the handle is moved into the position shown in Fig. 1. the shutter 141 will be opened and the damper 94 will be moved to close the indirect .draft pipe 96, the draft will then pass through the opening 142 and upwardly toward the grate, through the flue, thence through the passageway 30, pipe 87, draft box 92, outlet draft pipe 100 to the chimney. At the time. the doors 52and 53 will be closed. This arrangement of the draft is preferable in starting a fire, since there is a direct draft upwardly through the flue.

After the fire has been properly started, the hand operated lever 122 can be moved into a position so that its pin 132 enters the recess 130. This movement of the hand operated lever will permit the shutter 141 to close and will cause the damper 9 1 to be moved into engagement with the edge 86 of the sleeve 85, and thereby cut off draft through thepipe 87. This movement of the lever 122 will also cause the doors 52 and 53 to be opened and the draft will then pass through the openings 50 and 51, passageways 26 and 27, combustion chamber 23; thence downwardly between the grate bars, then through the passageway 31, hot air drum 67 and openings 97 and 98 to the indirect draft pipe 96; thence upwardly through the draft box 92 and outlet draft pipe 100.

By the arrangement of the indirect draft passageway 31 and the water tubes 33, as above described, the hot products of combustion will, after passing through said passageway 31, engage the water tubes 33 before engaging with the flue tubes 73. Thus, the water tubes serve as a barrier which preye'ntsthe rapid burning out of the flue tubes and also causes a division and distribution of the products of combustion over a wide and, since these tubes 33 contain water, they willnot rapidly burn out.

The tie rods 68 by being positioned within the hot air drum 67 will expand in proportion to the heat contained in said drum so that the parts will be securely held together and the parts will expand proportionately to each other.

Taking into consideration the expansion of the parts adjacent the rear of my generator, I preferably do not rigidly fix the outlet draft pipe 100 to the draft box, but on the contrary provide a slidable connection for said outlet draft pipe 100 upon the top of the draft box. For this purpose I provide the bottom of the outlet draft pipe 100 with the extended flange 154 and provide guiding strips 155 at each side of said flange. As shown in Figs. 1 and 2, these guiding strips 155 are undercut so that the flange 154C extends thereunder and normally holds, with suflicient tension, to provide a close'fitting joint.

In order to insure even combustion, I provide thermo-acting means which consists of a pivoted lever 156 which is operated by a thermo-acting member 157, which can be connected with one of the steam pipes, as shown in Fig. .1. The lever 156 is connected by a chain 158 with one end of a beam 159, the latter being pivotally supported between its ends onan overhead support 160; The rear end of said beam is connected by a chain 161 to a check damper 162, the check damper being pivoted at its bottom and normally tends to open the draft box 92 to the atmosphere, and thereby check the draft of the chimney.

With this construction, it will be noted that as the heat increases, the thermoacting member 157 will expand and raise the lever 156 and when thus raised, the check damper 162 will tend to fall and open the draft box to the atmosphere and thereby reduce the force of. the draft. Upon cooling, 1 the thermo-acting member 157 contracts and the lever 156 is then lowered to' cause the beam 159 to swing so as to close the check damper and add more draft.

It will thus be noted that in my improved generator, the heat immediately adjacent the fuel serves to convert the water into steam and the hot products of combustion, in the operation of the generator, are caused to pass into the hot air drum 67 to heat the fuel tubes before passing to the chimney. The arrangement of the water tubes 33 and the flue tubes 73 is such as to divide the products of combustion and thereby cause the rapidabsorption of heat by the water tubes and the flue tubes prior to the passing of the gases and other products of combustion up the chimney.

The steam after passing through the turbine casing passes through a pipe 163 which conducts the steam to radiators (not illustrated) and the water of condensation from said steam can be returned through the pipe 13 into the boiler.

While I have thus described my invention as taking a particular form, it will be understood that the various partsof my invention may be changed without departing from the spirit thereof, and hence I do not limit myself to the precise construction set forth, but consider that I am at liberty to make such changes and alterations as fairly come within the scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. The combination of a steam boiler having a water space and a fire box'for containing fuel adapted to heat the water in said space, said fire box including a grate; means for supplying air below said grate; means for taking off products of combustion from above said grate; means for regulating and cutting off said air and products of combustion through said supply and take off means; hot air supply conducting means; means for admitting air above said fuel; means providing a'passag'eway located at a position below the top of said fuel and adapted to conduct products of combustion, after passing downwardly through the fuel, into engage ucnt with said hot air conducting means; means providing a take off passage for said pro-dun is of combustion aiter they engage said hot air conducting means; and means for regulating and cutting oil the passage of air and products of combustion through said latter mentioned air admitting means and passageway; substantially as described.

2. The combination oi a steam boiler having a water space and a fire box for containing fuel adapted to heat the water in said space; hot air supply conducting moans; means providing a passageway communicating with said fire box below the fuel therein for conducting products of combustion from said fire box into engagement with said hot air conducting means; and water conducting means communicating with said water space, said water conducting means providing a battle and positioned so as to be engaged by said products of combustion after leaving the fire box and prior to the engagement of said products of combustion with the hot air conducting means whereby water in said water conducting means will be heated and the products of combustion will be divided and distributed into various spaces to heat the hot air conducting means; substantially as described.

3. The combination of a steam boiler having a water space and a fire box "for containing fuel adapted to heat the water in said space; hot air supply conducting means; means providing a passageway communieating with said fire box below the fuel therein for conducting products oi combustion from said fire box into engagement with said hot air conducting means; and water conducting means communicating with said water space, said water conducting means providing a bafiie and positioned so as to be engaged by said products of combustion after leaving the fire box and prior to the engagement of said products of combustion with the hot air conducting means whereby water in said water conducting means will be heated and the products of combustion will be divided and distributed into various spaces to heat the hot air conducting means, said water conducting means having openings into said water space at different levels whereby a circulation of water therethrough is permitted; substantially as described.

41. The combination of a steam boiler having a water space and a fire box for containing fuel adapted to heat the water in said space; a drum; flue tubes extending through said drum; means for admitting air to said tubes so as to pass therethrough; means for conducting the air from said tubespmeans providing a passageway communicating with said fire box for conducting products of combustion from said fire box into said drum; and water tubes communicating with the water space of said boiler and interposed between said passageway and said fiue tubes whereby the products of combustion engage said water tubes after leaving the fire box and prior to engaging said flue tubes, said water tubes forming a baflie to protect the flue tubes against burning out; substantially as described.

5. The combination of a steam boiler having a water space and a fire box for 0011- taining fuel adapted to heat the water in said space; a casing; a drum mounted within said casing; flue tubes extending through said drum; means for admitting air into the bottom of said casing so as to pass through said flue tubes into the top of said casing; means for conducting air out oi the top oi said casing; means providing a passageway communicating with said fire box for conducting products of combustion from said fire box into said drum; and water tubes communicating with the water space of said boiler and projecting into said drum, said water tubes being interposed between said passageway and said fiue tubes; substan tially as described.

6. The combination of a steam boiler hav ing a water space and a fire box for containing fuel adapted to heat the water in said space; a drum; air conducting means extending through said drum; means providing a conduit for air so as to pass through said air conducting means; means providing a passageway positioned below said fuel and adapted to conduct products of combustion into said drum; means providing a take-off passage for said products of combustion after passing through said drum; means providing a passageway for conducting the products of combustion from the fire box above said fuel, said latter means directly communicating with said take-off passage: means for conducting air to the top of said fuel; means for conducting air to the bottom of said fuel; a door and a shutter for respectively closing said latter conducting means; a damper for closing either of said passageways to the take-off passage; and operatively connecting said damper, door and shutter whereby when said door is closed, the damper will be moved to close said first mentioned passageway to the takeoff passage, and when said door is opened, said shutter will be closed and the damper will be moved to close said second mentioned passageway to the take-off passage; substantially as described.

'2'. The combinationbf a steam boiler hava water space and a fire box for containing fuel adapted to heat the water in said space; a drum; air conducting means extending through said drum; means providing a conduit for air so as to pass through said air conducting means; means providing a passageway positioned below said fuel and 130 adapted to conduct products of combustion into said drum; means providing a take-off passage for said products of combustion after passing through said drum; means providing a passageway for conducting the products of combustion from the fire box above said fuel, said latter means directly communicating with said take-off passage;

first mentioned passageway to thetake-ofli passage and to close the second passageway to said take-off passage and the shutter will be closed; said lever also being operative to effect the closing of said door and the opening of said shutter and to move said damper to close said first mentioned passageway to the take-off passage and open said second mentioned passageway to the take-oft passage; substantially as described. 7

8. T he combination of a steam boiler having a water space and a fire box for containing fuel adapted to heat the water in said space; a drum; air conducting means extending through said drum; means providing a conduit for air so as to pass through said air conducting means; means provid-' ing a passageway positioned below said fuel and adapted to conduct products of combustion' into said drum; means providing a,

take-off passage for said products of combustion after passing through said drum; means providing a passageway for conducting the products of combustion from the fire box above said fuel, said latter means directly communicating with said takeoff passage; means for conducting air to the top of said fuel; means for conducting air to the bottom of said fuel; a door and a shutter for respectively closing said latter conducting means; a damper for closing either of said passageways'to the take-off passage;

means operatively connecting said damper, door and shutter whereby, when said door is closed, the damper-will be moved to close said first mentioned passageway to the take off passage, and when said door is opened, said shutter will be closed and the damperwill be moved to close said second mentioned passageway to the take-off passage; an operating lever; means operatively connecting said lever with said door; means adjustably connecting said shutter; and means adjustably connecting said lever with said damper, whereby, when the lever is operated to open said second mentioned passageway to the take-off passage; substantially as described.

9. The combination of a steam boiler having a water space and a fire box for containing fuel adapted to heat the water in said space; a drum; air conducting means extending through said drum; means providing a conduit for air so as to pass through said air conductin means; means providing a passageway positioned below said fuel and adapted to conduct products of combustion into said drum; means providing a take-off passage for said products of combustion after passing through said drum; means providing a passageway for conducting the products of combustion from the fire box above said fuel, said latter means directly communicating with said take-off passage; means for conducting air to the bottom of said fuel; a door and a shutter for respectively closing said latter conducting means; a damper for closing either of said passageways to the take-off passage; means operatively connecting said damper, door and shutter whereby, when said door is closed, the damper will be moved to close said first mentioned passageway to the take-off passage, and when said door is opened, said shutter will be closed and the damper will be moved to close said second passageway to the take-off passage; an operating lever having two slots therein; means operatively connecting said lever with said door; means connecting said lever with said shutter and including a link having a pivot bolt adjusts ably secured within one of saidslots; and means connecting said lever with said damper and including a link having a pivot bolt adjustably secured within the other of said slots, whereby, when the lever is operated to open the door, the damper will be moved to open said first mentioned passageway to the take-off passage and to close the second passageway to said take-01f passage and the shutter will be closed; said lever said door and the opening of said shutter and to move said damper to close said first mentioned passageway to the take-off passage and open said second mentioned passageway to the take-off passage; substantially as described.

10. The combination of a steam boiler having a water space and a fire box for containing fuel adapted to heat the water in said space; a drum; air conducting means ex tending through said drums; means providing a conduit for air so as to pass through said. air conducting means; means provid ing a passageway positioned below said fuel and adapted to conduct products of combustion into said drum; means providing a take-off passage for said products of combustion after passing through said drum; means providing a passageway for conducting the products of combustion from the fire box above said fuel, said latter means directly communicating with said take-0d passage; means for conducting air to the top of said fuel; means for conducting air to the r bottom of said fuel; a door and a shutter for respectively closing said latter conducting means; a damper for closing either of said passageways. to the take-off passage; an operating lever; means operatively connecting said lever and said drum; means connecting said lever With said shutter; means connecting said lever With said damper whereby, When the lever is operated to open the door, the damper Will be moved to open said first mentioned passageway to the takeoil passage and to close the second passage Way to said take-oi? passage and the shutter will be closed; said lever also being operative to effect the closing of said door and the opening of said shutter and to move said damper to close said first mentioned-passageway to the take-off passage and open said second mentioned passageway to the take-oil passage; means providing a pivotal mounting for said lever; a bracket providing a guideway for said lever and having recesses therein, said lever having arportion adapted to enter either of said recesses; and means automatically operative to move said lever on its pivoted support to cause said portion to enter either of said recesses and thereby prevent accidental operating movement of the lever; substantially as described. In testimony whereol I have signed my name to this specification in the presence of two subscribing Witnesses.

BRACE A. PHILLIPS. Witnesses Many A. INGLAR, CHAS. E. Porrs.

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