US3867729A

US3867729A - Incinerator

Info

Publication number: US3867729A
Application number: US389140A
Authority: US
Inventors: Robert C Helke
Original assignee: MERE IND Inc
Current assignee: LA MERE INDUSTRIES Inc; MERE IND Inc
Priority date: 1973-08-17
Filing date: 1973-08-17
Publication date: 1975-02-25
Anticipated expiration: 1992-02-25
Also published as: DE2439467A1; JPS5054170A; JPS5246030B2; CH578153A5

Abstract

An incinerating toilet device which burns waste in a combustion chamber after which the combustion chamber is cooled. A control system controls the length of the burning and cooling cycles responsive to the temperature of the combustion chamber and the temperature in the exhaust duct from the combustion chamber. The control senses two combustion chamber temperatures, i.e., a first elevated temperature indicative that waste material has been completely burned and a second more elevated temperature indicative of dangerous conditions in the combustion chamber. Responsive to the first elevated temperature, the control deactivates the combustion chamber burning means and responsive to the second elevated temperature, the control renders the important operative portions of the device, and especially the burning and cooling means, inactivatable until the control is replaced. After deactivation of the burning means responsive to the first elevated temperature, the cooling means cools the combustion chamber to a predetermined significantly lower temperature whereupon the control means deactivates the cooling means. In the bottom of the combustion chamber, a waste support member is located having a temperature conductive base portion extending to the exterior of the combustion chamber wall where it is provided with receivers for receiving temperature sensitive probes of the control system.

Description

United States Patent [191 Helke [111 3,867,729 51 Feb. 25, 1975 l INCIN ERATOR [75] Inventor: Robert C. Helke, Walworth, Wis.

[73] Assignee: La Mere Industries Inc., Walworth,

Wis.

[22] Filed: Aug. 17, 1973 21 Appl. No.: 389,140

[52] U.S. Cl. 4/131 [51] Int. Cl A47k 1l/02 [58] Field of Search 4/131, 118, 8; 110/9 E, 110/9 R; 431/79 [56] References Cited UNITED STATES PATENTS 3,103,017 9/1963 La Mere 4/131 3,230,913 l/l966 La Mere... 4/131 X 3,319,588 5/1967 Duncan 110/9 R 3,320,907 5/1967 Duncan 110/9 R 3,323,473 6/1967 Frankel 110/9 R 3,458,873 8/1969 Nordstedt et a1. 4/131 3,694,825 10/1972 Kufrin 4/l3l 3,752,090 8/1973 Frankel et a1 110/9 R Primary Examiner-Henry K. Artis Attorney, Agent, or Firm-Coffee & Sweeney [57] ABSTRACT An incinerating toilet device which burns waste in a combustion chamber after which the combustion chamber is cooled. A control system controls the length of the burning and cooling cycles responsive to the temperature of the combustion chamber and the temperature in the exhaust duct from the combustion chamber. The control senses two combustion chamber temperatures, Le, a first elevated temperature indicative that waste material has been completely burned and a second more elevated temperature indicative of dangerous conditions in the combustion chamber. Re

sponsive to the first elevated temperature, the control deactivates the combustion chamber burning means and responsive to the second elevated temperature, the control renders the important operative portions of the device, and especially the burning and cooling means, inactivatable until the control is replaced. After deactivation of the burning means responsive to the "first elevated temperature, the cooling means cools the combustion chamber to a predetermined significantly lower temperature whereupon the control means deactivates the cooling means.

In the bottom of the combustion chamber, a waste support member is located having a temperature conductive base portion extending to the exterior of the combustion chamber wall where it is provided with receivers for receiving temperature sensitive probes of the control system.

19 Claims, 11 Drawing Figures PATEr-HEB 3; 867. 729 sum 1 5 5 m PUT VOLTAG E PATENTEU FEB 2 519. 5

Sum s o 5 58 FAN MOTOR CIRCUIT PROT FIG.|I

IGNITOR D ASPIRATING NOZZLE AIR VALVE REG.

DEMAN REG AIR

FUEL

1 INCINERATOR BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to incinerators which operate by burning waste during a burning cycle, followed by a combustion chamber cooling cycle, and especially relates to control of the of the cycles. More particularly, the invention relates to control of the burning and cooling cycles in incinerating toilets which are useful for disposing of human wastes.

2. Brief Description of the Prior Art Incinerating toilets and other small household incinerating devices are coming more and more into use as pollution problems grow. For example, such incinerating devices have found use in residences, camping areas, cottages and boathouses, and on vehicles such as house trailers, houseboats and trains, and many other areas. Such devices usually operate on a timed burning cycle followed by a timed cooling cycle. The length of the cycle is often built into the device and it is often unnecessary to complete the full timed burning cycle for incinerating the deposited waste. This, of course, wastes fuel. Moreover, should the timer develop a malfunction or jam during the burning cycle the cycle could continue without terminating and develop extremely high and dangerous temperatures within the combustion chamber. The possibility of extreme temperature conditions necessitates the use of more expensive materials for fabricating the combustion chamber.

SUMMARY OF TI-IE INVENTION The present invention provides an incinerator of the type operating on an untimed burning period or cycle followed by an untimed cooling period or cycle. The burning cycle is terminated responsive to a first elevated temperature in the combustion chamber indicative of completion of burning. The cooling cycle commences and is terminated by reduction of temperature to a lower level so that the devicecan be comfortably reused. Additionally, a second very highly elevated combustion chamber temperature condition indicative of malfunction is detected for completely and permannently deactivating the important components of the incinerator by opening a control switch which cannot be reclosed. This requires the presence of a repairman to replace the switch, at which time he can examine the device and correct the malfunction. The fail-safe provide by the second high temperature shut-off advantageously permits the use of less expensive materials in fabricating the combustion chamber walls, e.g., sheet metal in lieu of the customary cast steel.

An imporved combustion chamber waste support system is also provided in the form of a foraminous platform having a heat conductive support leg impaling the combustion chamber bottom wall and fitted with temperature probes exteriorly of the chamber for sensing temperatures indicative of combustion chamber temperatures.

While this invention is susceptible of embodiment in many different forms, there is shown in the drawings and will herein be described in detail an embodiment and modification thereof, with the understanding that the present disclosure is to be considered as an exemplification of the principles of the invention and is not intended to limit the invention to the embodiment or modification illustrated.

BRIEF DESCRIPTION OF THE DRAWINGS 2-2 in FIG. 1;

FIG. 3 is a section along line 3-3 of FIG.'2 with a trapdoor member removed to expose parts located therebelow;

FIG. 4 is a section through the combustion pot of the device along line 4-4 of FIG. 3;

FIG. 5 is a bottom plan view of the waste support member shown in the device in FIGS. 2-4; I FIG. 6 is a section along line 6-6 of FIG. 5;

FIG. 7 is a top plan view of a base member upon which the waste support member of FIGS. 26 rests;

1 FIG. 8 is a section along line 88 of FIG. 7;

FIG. 9 is a wiring diagram of a controlcircuit useful in the device of FIGS. 1 through 8;

FIG. 10 is a flow scheme for use in modifying the device of FIGS. 1-8 for burning oil in lieu of gas; and

FIG. 11 is a wiring diagram ofa control system useful in the modified device.

DESCRIPTION OF THE PREFERRED EMBODIMENT To a large extent the present invention provides improvements and modifications in an incinerating toilet such "as that shown in Frankel et al. US. Pat. No. 3,338,191 and Frankel et al. US. Application Ser. No. 108,040, filed Jan. 20, 1971. As background material and so far as description of the structure and operation of an incinerating toilet is concerned, US. Pat. No. 3,338,191 and US. Application Ser. No. 108,050 are hereby incorporated herein by reference.

Referring first to FIGS. l-3, the incinerating toilet includes a tear drop shaped cabinet 20 with a housing 22 and an outer sidewall skirt 24 secured by suitable spacer members to the housing 22 to define an air space 26 between housing 22 and skirt 24. Air can' enter air space 26 (FIG. 2) at the bottom of skirt 24 and ports 28 are provided around the upper portion and the lower front portion of housing 22 for entry of air from space 26 into another air space 29 within housing 22. Ports 28a (FIGS. 1 and 2) are also provided for more direct entry of air into the lower portion of space 29. Skirt 24, being shorter than housing 22, also provides a foot well at the front and sides of the device. The double wall structure of housing 22 and skirt 24 adds strength to the unit.

Housing 22 also includes a top deck 30 having a central waste receiving opening 30a with a seat such as split seat 32, with seat opening 32a generally registering with the opening 30a. A lid or cover 34 for opening 320 is secured to a hinge rod 36 (FIGS. 2 and 4) for pivotal movement with rod 36 between open and closed positions. Spacers 340 are provided on the bottom surface of cover 34 for spacing cover 34 from seat 32 when cover 34 is in its closed position. Seat 32 is pivotally mounted on hinge rod 36 for movement between raised and lowered positions. Seat 32 also has spacers 32b for spacing it from top wall 30 when in lowered position.

mounted in the bottom of cabinet 20 is a large and deep combustion pot (FIGS. 2 and 3) defining a combustion chamber 38 containing a waste support member 40. The combustion chamber wall can be formed of sheet metal and has an outer layer of high temperature insulation 39. A gas burner 42 (FIG. 2) is mounted at an elevated position at about the lip of the combustion chamber 38 and trained downward at an angle to the sidewall of the combustion chamber to impinge a flame on the upper surfaceof member 40 generally in the flame foot print area 40a indicated in FIG. 3. An upstream igniter is provided for burner 42 in the form of spark plug 44 which is mounted in a position spaced upstream from the flame supporting outlet or holding port 42a of burner 42 so that the igniter 44 is removed from and protected from contamination with urine salts, splash, slosh, etc. from the raw and burning wastes. An ignition coil 45 services spark plug 44.

A mixture of air and fuel, in this case gas, is supplied by a supply conduit or tube 46 to burner 42 from pressurizer 48 (FIGS. 2 and 3) mounted in the rear of the cabinet 20. Pressurizer 48 has an outlet mixing chamber 50 (FIG. 3) into which a gas line 52 introduces fuel. A gas line solenoid valve 54 (FIG. 2), of the on-off type, is provided for controlling flow of gas through line 52 and into chamber 50, thereby controlling flow of gas to the burner outlet 42a for supporting a flame. Valve 54 is opened during the burning cycle and closed during the cooling cycle although pressurizer 48 functions during both cycles so that combustion air is supplied during the burning cycle and cooling air is supplied to the combustion chamber from nozzle 42 during the cooling cycle.

In the exhaust system for exhausting air and combustion gases from the combustion chamber 38 of the device, there is provided a blower 56 having an outlet at 56a attached to and in communication with siutable vent duct work at57. A motor 58 is provided for driving both pressurizer 48 and blower 56. A housing definnoid 64 through suitable linkage 66 and is returned to a closed position (shown in full lines in FIG. 2) by return spring 67 when solenoid 64 is de-energized.

During the cooling cycle, the plate or hinged vent valve 62 remains in closed position under tension of spring 67. Exhaust blower 56 draws cooling air supplied by pressurizer 48 through conduit 46 and from burner outlet 42a, and air from various leaks in the device, i.e., as permitted by the trapdoor (described below) in the hopper, from around the burner mounting and around vent valve 62, into chamber 60 for exhausting at exhaust outlet 56a. During the burning cycle the vent valve 62 is moved to open position so that much more air is drawn from space 26 (FIG. 2) through ports' 28, thence through space 29 and into inlet chamber 60 for exhausting, at the same time decreasing the flow of air through the combustion chamber which results in a higher combustion chamber burning temperature. Ports 28a permit greater air flow through the portion of space 29 immediately surrounding the combustion chamber 38 for producing aco oling effect on the exterior of the insulated combustion chamber and hopper during the burning cycle. Open vent valve 62 also results in reduction of air flow through the combustion chamber by decreasing the draft on the combustion chamber by blower 56 and the reduced air flow through combustion chamber 38.

Inside cabinet 20 and above the combustion chamber 38, a receptacle or hopper 70 (FIG. 2) extends from top wall 30 to a lower hopper lip 7011 at a hopper bottom outlet which opens into combustion chamber 38 for directing waste into the combustion chamber. A trapdoor 72 is secured by a suitable hinge 74 at the rear wall of hopper 70 for pivotal movement between positions opening and closing the hopper bottom outlet. Suitablelinkages indicated by the dotted lines 76 are provided between the trapdoor 72 and lid 34 for opening trapdoor 72 each-time lid 34 is opened and closing trapdoor 72 each time lid 34 is closed.

The wast support member 40 forms a part of a waste support and combustion chamber temperature sensing system (FIGS. 2-6). In the form shown, the member 40 (FIGS. 2-6) is a four-legged, mushroom-shaped trivet of ceramic, cast steel or other heat resistant material having a waste supporting upper surface and a central bottom convex'projection 40b (FIGS. 2 and 4-6) supported in a concave receiver 80a of a cast iron base member 80 (FIGS. 2, 4, 7 and 8).-The base member 80 is of highly heat conductive material and functions as a heat sink.

Base member 80 has a peripheral flange portion 80b which is secured to the bottom surface of the sheet metal combustion chamber wall 38 by copper brazing or the like so that the receiver 800 projects upwardly within the combustion chamber and receives surface 40b to support the trivet within the combustion chamber. Where the combustion chamber 38 is cast in lieu of being formed of sheet metal, the base 80 can be cast as an integral portion of the combustion chamber walls.

The four legs of the trivet retain the upper platform surface of the trivet fairly level within the combustion chamber. Ports or bores 82 are provided through the platform portion of trivet 40 for drainage of liquid therebelow. Thus, when the flame engages and heats the trivet it burns solidwaste material on the trivet surface and vaporizes liquid from beneath the trivet. The bottom surface 40d of trivet 40 is curved adjacent its outer edge for focusing radiating heat on the combustion chamber bottom wall for faster vaporization and combustion of any liquid or other waste material ben'eath the trivet.

An upwardly projecting slot 80c (FIGS. 7 and 8) is provided in the top portion of base 80 for receiving a locating fin 40c (FIGS. 4-6) extending laterally from the convex projection 40b for properly radially locating the trivet 40 relative to the base member 80. Outside of the combustion chamber, base 80 includes a pair of probe receiving cavities or bores 84 and 86 in which temperature sensitive probes 88 and 90 (FIG. 2) are contained. Probe 88 is a non-resettable high temperature responsive switch which permanently breaks an electrical circuit when it reaches a temperature of about 750F. Probe 90 is a temperature responsive electrical switch which breaks contact at about 450F'. and resets or closes when cooled down.

The 450F. temperature at probe 90 indicates that the temperature in the combustion chamber has reached about 1,500 F. for at least one-half second for the purpose of destroying all odors in the combustion chamber. The 750F. temperature at probe 88 indicates that the combustion cycle is proceeding out of control, possibly due to a failure in probe 90, and may soon reach a dangerous temperature.

A number of electrical components are provided in cabinet for controlling the burning and cooling cycle. For example a DPDT lid switch 92 (FIG. 2) is mounted for actuation by movement of the lid to turn on the blower motor 58 each time lid 34 is opened. Switch 92 is shown in FIG. 2 associated with linkage 76 by which switch 92 is actuated. When the lid 34 is closed, switch 92 initiates the burning cycle. A sail switch 94 (FIGS. 2 and 3') is mounted in the exhaust portion of blower 56 and closes responsive to detection of air flow from blower 56 and reopens when air flow ceases. A temperature responsive blower cooling switch 96 (FIG. 3) is also mounted in the blower exhaust and opens when the temperature in the blower exhaust is below about 120F.

Turning now to FIG. 9, suitable circuitry is provided for controllingoperation of the incinerating toilet on temperature responsive cycles. The circuitry is shown with the lid 34 in raised position with DPDT seat switch contact 92b supplying power through closed control switch 90 to TPDT relay R which closes relay contacts R'l, R-2. and R3. Blower motor 58 is energized through relay contact R-l so that air is circulated through combustion pot 38 during use of the device to carry away odors. The movement of air by' blower 56 through exhaust outlet 56a closes sail switch 94.

After use, the lid 34 is closed, reversing the poles of the seat switch 92. Relay R holds through closed contact R-2 and closed cycle control switch 90. The blower motor 58 is now energized through closed contacts R-land R-2 and the igniter 44 is energized through contact R-3, and switch 92 and the'vent solenoid and gas valve solenoid are energized through said switch 94. Fuel and air are'supplied to the burner 42 sensitive cycle control switch 90, switch 90 opens, de-

energizing relay R so that contacts R-I through R-3 open. This de-energizes the vent solenoid 64, the gas valve solenoid 54 and the igniter 44 and initiates a cool cycle. Blower motor 58 continues to be energized until the temperature in exhaust outlet 56a falls to about 120F. whereupon the temperature sensitive blower cool-down switch 96 opens to de-energize blower motor 58 and terminate the cooling cycle. Cycle control switch 90 recloses at about 100F. The device is then ready for reuse.

As safety features, it will be noted that the gas valve 54 will not open unless sail switch 94 detects flow of air through outlet 56a so that raw gas will not collect in the combustion chamber 38 should there be a failure in ignition. Further, the combustion chamber overheat switch 88 is provided, which opens at about 750F. responsive to a rise in the combustion chamber temperature to an extremely high temperature indicating a malfunction in the system. Switch 88 is not resettable once open so that the user will be required to call a repairman to replace switch 88 and make other necessary repairs prior to further use of the device.

If it is desired to use an oil burner rather than a gas burner in the device, certain modification will be made. For example, referring to FIG. 10, an aspirating oil 6 burner 102 replaces the gas burner 42 and is supplied with air through air valve 104 and fuel oil through fuel valve 106. .Both the air and fuel lines are equipt with pressure regualtors 108 and 110 respectively.

As shown in FIG. 11 certain other modifications'were made in the device using the oil burner. For example, sail switch 94 controls both the fuel valve and. air valve. Additionally, a flame sensor 112 is provided for detecting a flame at burner 102 or at a pilot for burner 102. if no flame is detected within a short interval after the burning cycle commences, flame sensor 112 opens contact FS-l to close air valve 104 and fuel valve 106. This prevents puddling of fuel oil in the combustion chamber in the event there is no ignition.

I claim:

1. An incinerator comprising a casing, wall means defining a combustion chamber in said casing having an outlet exhaust duct extending to the exterior of said casing, inlet means in said casing for delivering waste material to be burned to said combustion chamber, a fuel burner for burning the waste material during a burning cycle in said combustion chamber, means for cooling the combustion chamber during a cooling cycle, and control means for activating both said burner and said cooling means and for deactivating said burner means including a temperature sensor for sensing apredetermined elevated temperature of said combustion chamber and fuel valve means for deactivating said burning means responsive to said elevated temperature without deactivating said cooling means at said temperature.

2. The incinerator of claim 1 including a second temperature sensor in said outlet exhaust duct for deenergizing said blower responsive to a decrease in temperatures from said elevated temperature to a reasonably comfortable temperature substantially lower than said elevated temperature.

3. The incinerator of claim 1 wherein said cooling means comprises draft means for drawing gases from said combustion chamber into said exhaust duct, and including a source of air adjacent said duct, an air valve which is open during the burning cycle for admitting air from thesource into the duct, and means for closing said valve responsive to said elevated temperature.

4. An incinerating device comprising a casing, a combustion chamber in said casing, inlet means in said casing for delivering waste material to be burned to said combustion chamber, means for burning the waste material in said combustion chamber, means for cooling the combustion chamber, and control means for activating and deactivating said burning means and said cooling means including temperature sensing means for sensing a predetermined elevated temperature of said combustion chamber indicative of completion of burning and a predetermined decreased temperature substantially lower than said elevated temperature, and indicative of completion of cooling, means for deactivating the burning means responsive to the elevated temperature and means for deactivating the cooling means responsive to said decreased temperature.

5. The device of claim 4 including replaceably mounted sensing and non-resettable breaking means for sensing a predetermined maximum temperature limit for use of the device significantly greater than said elevated temperature and for breaking to deactivate both the burning and heating means responsive to said temperature limit.

6. An incinerating device comprising a casing, a combustion chamberinsaid casing, inlet means in said casing for delivering waste material to be burned to said combustion chamber, fuel burner means for burning the waste material in said combustion chamber and having a fuel supply conduit with an on-off valve for controlling fuelflow to the burner, means for activating said burner means including means for opening the fuel control valve, a first temperature sensing means for sensing a predetermined first elevated temperature of said combustion chamber, means for resettably deactivating said .burner including means for closing said valve responsive to said first elevated temperature, and a second temperature sensing means for sensing a second elevated temperature of said combustion chamber significantly higher than said first elevated temperature and for deactivating said burner including closing said valve responsive to said second elevated temperature.

7 .An incinerating device comprising a casing, a combustion chamber in said casing, inlet means in said casing for delivering waste material to be burned to said combustion chamber, fuel burner means for burning the waste material during a burning cycle in said combustion chamber and having a fuel supply conduit and fuel supply control valve means, control means for activating and deactivating said burner means including means for opening said valve while activating the burner, means for sensing a predetermined first elevated temperature of said combustion chamber, means responsive to said sensing means for closing said valve, means for sensing a second elevated temperature of said combustion chamber significantly higher than said first elevated temperature for overriding said activating means and rendering said burner inactivatable with said valve closed,

8. The device of claim 7 wherein said cooling means comprises a blower for drawing air through and around the combustion chamber.

9. The device of claim 8 including a sail switch for blocking opening of the fuel valve in the absence of a draft of air by said blower.

10. The device of claim 7 wherein said cooling means comprises draft means for drawing gases from said combustion chamber into said exhaust'duct, and including a source of air adjacent said duct, an air valve which is open during the burning cycle for admitting air from the source into the duct, and means for closing said valve responsive to said elevated temperature, and wherein said overriding means renders said draft means and air valve inactivatable.

' 11. The device of claim 7 including a seat member having a central opening in registry with said inlet means, and a hinged lid for covering and uncovering said opening, said control means'including means responsive to raising said lid to uncovering position for activating said cooling means and means responsive to closing said lid for activating said burner means.

12. The device of claim 11 wherein said overriding means is non-resettable and is replaceably mounted in heat receiving proximity to the combustion chamber.

13. An incinerating device comprising a casing, wall means defining a combustion chamber in said casing having an outlet exhaust duct extending to the exterior of said casing, inlet means in said casing for delivering waste material to be burned in said combustion chamber, means for burning the waste material during a burning cycle in said combustion chamber, means for cooling the combustion chamber during a cooling cycle, a support member for receiving waste to be burned above the combustion chamber bottom wall and having a heat conductive base extending through the bottom wall, and temperature sensor means mounted in said base for sensing a predetermined elevated temperature indicating completion of burning in said combustion chamber for de-energizing said burning means.

14. The device of claim 13 including a second temperature sensor mounted in said base for sensing a second predetermined elevated temperature indicating hazardous thermal conditions in said combustion chamber significantly higher than said first elevated temperature for de-energizing said burning and cooling means.

15. The device of claim 14 wherein said first predetermined elevated temperature is in the range of 400 to 500F. and said second predetermined elevated temperature is above 750F., a third temperature sensor mounted in said outlet exhaust duct for de-energizing said cooling means responsive to a decrease in temperaturefrom said first elevated temperature to a predetermined temperature substantially lower than said first elevated temperature and in the range of about to 1'50F.

16. The device of claim 13 wherein said support member comprises a foraminous trivet having a central bottom convex surface and the base is an upstanding leg with concave top for releasably receiving the convex surface of the trivet for supporting the trivet.

17. The device of claim 13 wherein said support member is foraminous and said burning means is a fuel burner mounted to impinge a flame directly on and under said support member.

18. The device of claim 13 wherein said support member has a bottom surface portion for radiating heat against the combustion chamber bottom wall.

19. The device of claim 18 wherein said supporot member is ceramic and mushroom shaped.

Patent No.

Dated Inventor(s) Robert C Helke It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

* IN THE CLAIMS:

temperaturee [SEAL] FORM PO-IOSO (IO-69) Claims 1, A, 6, '7, l2, l5 and 1 should be deleted and the following claims substituted therefor:

An incinerator comprising a casing, wall means defining a combustion chamber in said casing having a waste receiving wall and an outlet exhaust duct extending to the exterior of said casing, inlet means in said casing for delivering waste material to be burned to said combustion chamber a fuel burner for burning the waste material during a burning cycle in said combustion chamber, means for cooling the combustion chamber during a cooling cycle,

and control means for activating both said burner and said cooling means and for deactivating said burner means including a temperature sensor directly contacting said waste receiving wall for sensing a predetermined elevated tempera ture of said combustion chamber and fuel valve means for deactivating said burning means responsive to said elevated temperature without deactivating said cooling means at said tn's A ttest:

RUTH C. MASON Arresting Officer C MARSHALL DANN ((mzmisximwr rlf'larz'nls and Trademarks USCOMM-DC 60376-P69 U 5 GOVERNMENT PRINTING OFFICE UNITED STATES PATENT cTTTcE Page 2 QERTIFICATE U QQRRECHUN lnventor(s) Robert C. Helke It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Ia An incinerating device comprising a casing,

a combustion chamber in said casing having a waste receiving bottom wall, inlet means in said casing for delivering waste material to be burned to said combustion chamber, means for burning the waste material in said combustion chamber, means for cooling the Combustion chamber,

and control means for activating and deactivating said burning means and said cooling means including a first temperature sensor in direct contact with the waste receiving wall for sensing a predetermined elevated temperature of said combustion chamber indicative of completion of burning and a second temperature sensor for sensing a predetermined decreased temperature substantially lower than said elevated temperature,

and indicative of completion of cooling, means for deactivating the burning means responsive to the elevated temperature and means for deactivating the cooling means responsive to said decreased temperature.

%igmd and gcaitd this [SEAL] ninth y ptemberJ975 A ttes t:

RUTH C. MASON C. MARSH Aftesll'ng ()ff ALL DANN ommzssmner nfPatents and Trademarks FORM FO-IOSO (10-69) USCOMM-DC 60376-P69 u 5. GOVERNMENT PRINTING OFFICE: 930

F ORM 1 0-1050 (10-69) Patent No.

[SEAL] Page 5 UNHED STATES @ATENT @EFEQE QER'EEFELQATE @l? @QRRECTEQN 5 67 729 Dated February 25 1975 Invent fls) Robert C: Helke It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

6., An incinerating device comprising a casing, a

combustion chamber having a waste receiving bottom wall in said casing inlet means in said casing for delivering waste material to be burned to said combustion chamber,

fuel burner means for burning the waste material in said combustion chamber and having a fuel supply conduit with an on-off valve for controlling fuel flow to the burner,

means for activating said burner means including means for opening the fuel control valve; a first temperature sensing means contacting said bottom wall for sensing a predetermined first elevated temperature of said combustion chamber, means for resettably deactivating said burner including means for closing said valve responsive to said first elevated temperature, and a second temperature sensing means contacting said bottom wall for sensing a second elevated temperature of said combustion chamber significantly higher than said first elevated temperature and for deactivating said burner including closing said valve responsive to said second elevated temperature,

,[ignrd and ca e tn's ninth Day at September1975 A zres r:

RUTH QC. MASUN Aziesil'ng ()j'j'iver (I. MARSHALL DANN (omml'ssimwr u /Iaunls and Trademarks USCOMM-DC 60376-P69 u 5 GOVERNMENT PRINTING orncz- 930 o UNlTED STATES PATENT orrrca Page A QER'HFEQATE @F (ZQRREQ'HQN Patent NO. 3,867,729 Dated February 25. 197% Inventor(s) Robert C. Helke It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

7.. An incinerating device comprising a casing,

a combustion chamber with a bottom waste receiving wall in said casing, inlet means in said casing for delivering G waste material to be burned to said combustion chamber, fuel burner means for burning the waste material during a burning cycle in said combustion chamber and having a fuel supply conduit and fuel supply control valve means control means for activating and deactivating said burner means including means for opening said valve while activating the burner means in contact with said wall for sensing a predetermined first elevated temperature of said combustion chamber, means responsive to said sensing means for closing said valve,

6 means in contact with said wall for sensing a second elevated temperature of said combustion chamber significantly higher than said first elevated temperature for overriding said a activating means and rendering said burner inactivatable with $igaed and geaitd this Q m'nlh Bay Q? September1975 Arrest:

Q RUTH c. MASON c. MARSHALL mm est/11g ()fjzcer (ummlssmner (1] Parents and Trademarks LLS. GOVERNMENT PRINIIIU vnmn FORM PO-IOSO (10-69) Page 5 UNITED STATES PATENT ()FHQE Patent No. Dated Robert C. Helke Inventor(s) It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

said valve closed.

12 The device of claim 11 wherein said overriding means is non-resettable.

15. An incinerating device comprising a casing, wall means defining a combustion chamber in said casing having an outlet exhaust duct extending to the exterior of said casing,

inlet means in said casing for delivering waste material to be burned in said combustion chamber, means for burning the waste material during a burning cycle in said combustion chamber,

means for cooling the combustion chamber during a cooling cycle a support member for receiving solid waste to be burned above the combustion chamber bottom wall releasing liquid waste to the bottom wall and having a heat conductive base extending through and forming a part of the bottom wall and temperature sensor and talc ta's ninth il ay 0? September 1975 [SEAL] Arrest:

RUTH C. MaSON (I. MARSHALL DANN Alrexrmg Officer (mnmissimwr oj'Parenls and Trademarks USCOMM-DC BUSIOH-u:

u.s. GOVERNMENT PRINTING OFFICE- 930 Page 6 Q UNITED STATES PATENT @FFICE QERTlFifiATE 9F QGRRECTEQN Patent No. 867 729 Dated February 25 1975 9 Robert C. Helke Inventor(s) It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

means mounted in contact with the bottom wall for sensing a predetermined elevated temperature indicating completion of burning in said combustion chamber for de-energizing said burning means.

14. The device of claim 13 wherein said sensor means a is mounted in said base and including a second temperature sensor mounted in said base for sensing a second predetermined elevated temperature indicating hazardous Q thermal conditions in said combustion chamber significantly higher than said first elevated temperature for de-energizing said burning and cooling means ggntd and gtalcd this ninth Day of September 1975 [SEAL] a Arrest:

RUTH C. MASON c. MARSHALL DANN Arresring Officer (mnmissinmr nfParenls and Trademarks FORM PO-105O (10-69) USCOMM-DC 60376-1 69 U.Sv GOVERNMENT PRINTING OFFICE: a 69- 9 o FORM PO-1D5O (IO-69) UNITED STATES PATENT OFFICE Page 7 Patent No. Dated February 25 975 I Robert C., Helke Inventor(s) It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

20. The device of claim 15 wherein said support member is movably mounted.

Column 8, line 49, "under" should read through Column 8, line 55, "ceramic and" should be deleted. Signed and Sealed this ninth Day Of September 1975 [SEAL] Arrest:

RUTH C. MASON Arresting Officer C. MARSHALL DANN (unmlissiuner uj'Palz'nrs and Trademarkx USCOMM-DC 60376-P69 u.s.covtmmzm PRINTING crncs- 869 93o UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3867729 Dated Inventor(s) Robert C. Helke It is certified that error appears in the above-identified patent and that said Letters Patent are hereby corrected as shown below:

Column 1., Line 50 delete "vide" and insert -vided-.

Column 1, Line 54, delete "imporved" and insert -improved.

Column 2, Line 31, delete "108,040" and insert -lO8,050-.

Column 6, Line 3, delete "equipt" and insert equipped--.

Signed and sealed this 27th day of May 1975.

(SEAL) Attest:

C. MARSHALL DANN RUTH C. MASON Commissioner of Patents Attesting Officer and Trademarks FQRM PC4050 (w'es) USCOMM-DC 60376-P69 Q U.S. GOVERNMENT PRINTING OFFICE 19.9 O3GG'SJ,

Claims

1. An incinerator comprising a casing, wall means defining a combustion chamber in said casing having an outlet exhaust duct extending to the exterior of said casing, inlet means in said casing for delivering waste material to be burned to said combustion chamber, a fuel burner for burning the waste material during a burning cycle in said combustion chamber, means for cooling the combustion chamber during a cooling cycle, and control means for activating both said burner and said cooling means and for deactivating said burner means including a temperature sensor for sensing a predetermined elevated temperature of said combustion chamber and fuel valve means for deactivating said burning means responsive to said elevated temperature without deactivating said cooling means at said temperature.

2. The incinerator of claim 1 including a second temperature sensor in said outlet exhaust duct for de-energizing said blower responsive to a decrease in temperatures from said elevated temperature to a reasonably comfortable temperature substantially lower than said elevated temperature.

3. The incinerator of claim 1 wherein said cooling means comprises draft means for drawing gases from said combustion chamber into said exhaust duct, and including a source of air adjacent said duct, an air valve which is open during the burning cycle for admitting air from the source into the duct, and means for closing said valve responsive to said elevated temperature.

6. An incinerating device comprising a casing, a combustion chamber in said casing, inlet means in said casing for delivering waste material to be burned to said combustion chamber, fuel burner means for burning the waste material in said combustion chamber and having a fuel supply conduit with an on-off valve for controlling fuel flow to the burner, means for activating said burner means including means for opening the fuel control valve, a first temperature sensing means for sensing a predetermined first elevated temperature of said combustion chamber, means for resettably deactivating said burner including means for closing said valve responsive to said first elevated temperature, and a second temperature sensing means for sensing a second elevated temperature of said combustion chamber significantly higher than said first elevated temperature and for deactivating said burner including closing said valve responsive to said second elevated temperature.

7. An incinerating device comprising a casing, a combustion chamber in said casing, inlet means in said casing for delivering waste material to be burned to said combustion chamber, fuel burner means for burning the waste material during a buRning cycle in said combustion chamber and having a fuel supply conduit and fuel supply control valve means, control means for activating and deactivating said burner means including means for opening said valve while activating the burner, means for sensing a predetermined first elevated temperature of said combustion chamber, means responsive to said sensing means for closing said valve, means for sensing a second elevated temperature of said combustion chamber significantly higher than said first elevated temperature for overriding said activating means and rendering said burner inactivatable with said valve closed.

10. The device of claim 7 wherein said cooling means comprises draft means for drawing gases from said combustion chamber into said exhaust duct, and including a source of air adjacent said duct, an air valve which is open during the burning cycle for admitting air from the source into the duct, and means for closing said valve responsive to said elevated temperature, and wherein said overriding means renders said draft means and air valve inactivatable.

11. The device of claim 7 including a seat member having a central opening in registry with said inlet means, and a hinged lid for covering and uncovering said opening, said control means including means responsive to raising said lid to uncovering position for activating said cooling means and means responsive to closing said lid for activating said burner means.

15. The device of claim 14 wherein said first predetermined elevated temperature is in the range of 400* to 500*F. and said second predetermined elevated temperature is above 750*F., a third temperature sensor mounted in said outlet exhaust duct for de-energizing said cooling means responsive to a decrease in temperature from said first elevated temperature to a predetermined temperature substantially lower than said first elevated temperature and in the range of about 100* to 150*F.