Abstract: An immersion type water heating element assembly. The assembly allows replacement of a water heating element for a hot water tank without removing the electrical supply wires or disconnecting an electrical supply by providing a first main plate having a hole therethrough and permanently attached to a hot water tank. Supply terminals are positioned on the first main plate and permanently wired to an electrical supply for supplying current. A second plate is detachably mounted to the first main plate and includes a water heating element and contact terminals which contact the electrical supply terminals when the second main plate is mounted on the first main plate. The assembly includes a sealing device for preventing water in the hot water tank from leaking through the first main plate and the second main plate. The immersion type heating element attached to the second main plate extends through the hole in the first main plate and into the hot water tank.

Abstract: An aquarium heater override control system for use with an aquarium heater in which the system includes a temperature probe placed in the aquarium environment and a control module with temperature settings, visual indications of power presence, circuit testing and reset buttons connected thereto that provides power to the heater so long as the temperature within the aquarium does not exceed a predetermined threshold value of the override control system.

Abstract: An improved heater and control apparatus (10) suitable for maintaining a proper temperature in a liquid environment such as an aquarium (12) is provided. The apparatus (10) includes a heater element (26) housed within a protective casing (28) to reduce the likelihood of heater element (26) breakage. A number of openings (30) are provided in casing (28) to permit direct contact between the heater element (26) and water in the aquarium (12). The control assembly (16) includes a novel active light display (99). Additional novel features and corresponding advantages of the apparatus (10) are disclosed.

Abstract: A tubular high efficiency, non-contaminating fluid heater includes an elongate tubular member having a coil-like configuration and a sidewall which defines an elongate tubular chamber formed from an inert material through which fluid is adapted to flow. The tubular member includes an inlet and an outlet and a plurality of elongate electrical resistance heaters sheathed with the same inert material are disposed in said tubular chamber for heating the fluid as it flows through the tubular chamber.

Abstract: An aquarium safety heater includes an adjusting screw rotatably held in a packing plug which is sealably secured in an upper portion of glass tube. A heating coil, a thermostat, a bimetal circuit breaker, and an electric controller are mounted within the glass tube. The adjusting screw is adjustable from the exterior of the glass tube for adjusting the electric contact pressure of the bimetal for ensuring reliable operation of the circuit breaker and the electric controller for safely switching off the power supply to the heating coil once the thermostat is out of order, thereby preventing the killing of fish raised in the aquarium.

Abstract: A core remover for removing cores from paper rolls comprising a two-piece heating conducting tube, the top part of the tube having, a smooth tapered tip, containing a thermostat bulb and a heating element for heating the tube, and the connection elements for the thermostat and heating element extending downward through the bottom part of the tube and to the thermostat. The thermostat and heating element are connected so that control of the temperature of the heating element and tube may be made. A core with paper wrapped around it is placed over the tube and heated for a few seconds to loosen the glue. Following that, the core is manually removed and at the same time or after, the inner most sheet of paper is pulled about 2 inches from the center of the paper roll.

Abstract: The warming device of the present invention includes a food tray or pan formed from metal so as to promote the conduction of heat to the food contained in the pan. The pan is held within a sump vessel adapted to contain a heat transfer fluid such as water. The sump vessel is a unitary bowl-shaped container having side and bottom walls and an upper open wide mouth for receiving the food pan whereby the food pan, when inserted, is located within the sump vessel so that the bottom portion of the food pan is spaced from the wall of the sump vessel to define a chamber suited for containing water and steam between the sump vessel and the food pan. The sump vessel has heat-insulating qualities that reduce heat loss and promote the transmission of heat to the food pan. A heat dissipator plate formed from a metal or other conductor of heat is connected to a wall of the sump vessel with an air space between the heat dissipator plate and the sump vessel.

Abstract: A method of combining electric heating with a wood-heated masonry furnace is provided. The masonry furnace has an outer jacket (1) and at least one fire chest (5, 6) arranged therewithin for burning the wood. Cheek conduits (8) between the outer surface of the fire chest and the inner surface of the outer jacket, are provided. The conduits are connected to the fire chest (5, 6) at one end and to a flue (9) at the opposite end. At least one electric resistor element (13) is installed inside the furnace. In order that electrical heating could be easily combined with any existing masonry furnace, holes (14) are drilled in the fire cover (10) of the furnace and the at least one resistor element (13) is arranged to hang from the fire cover (10) in the air space (8, 16) inside the furnace.

Abstract: A hand-held mixing device comprising an electric motor, an elongated shaft extending from the motor, a housing enclosing the motor and a major portion of the shaft, a blade at the free end of the shaft, a heating element extending from the housing, the heating element formed to have at least one coil surrounding the blade, the coil being dimensioned to be spaced from the outer edge of the blade and to form a generally annular gap thereabout. The motor and heating element are electrically connectable to an electrical power source wherein the electrical power to the motor and to the heating element are independently controllable.

Abstract: An electrically-heated spoon including a flat heating device made of a plate-like positive temperature coefficient (PTC) resistor having a periphery side wall of the spoon mounted to the periphery and a handle of the spoon extending from the side wall. A pair of conductive wires in electrical connection with the heating device are embedded in the handle and extend out of a remote end of the handle to define an external connector for connection to an external power source. The plate-like positive temperature coefficient resistor is sandwiched between two insulating plates and then encased by two opposite metal casing members with the conductive wires, which are connected to the resistor, extending through openings formed on the casing members for connection to a power source.

Abstract: The present invention relates to a process permitting the modification of the chemical composition of the inner face of a barrel, consisting in heating and in moistening the inner face of the shell (1) of this barrel, characterized in that it consists in alternately heating and moistening, according to a specified heating power and liquid flow rate, and for a specified time, the heating being distributed over the entire height of the shell.It also relates to a machine implementing this process and comprising a rotating support (12), heating means (19) and moistening means (20, 21, 22) which are vertically displaceable with respect to the main axis of the barrel.Application: barrels for wines and alcohols.

Abstract: To provide a balanced supply of distilled water and undistilled hot water for a household, a condenser coil communicates at one end with a steam generator located above a hot water heater and at its other end well the holding tank of a distilled water system, with a condenser entering the hot water heater near the bottom. The steam generator power input matches the power needed to meet the recovery rate to satisfy undistilled hot water demand under normal conditions. The condenser includes a plurality of loops grouped together so a line drawn from top to bottom through them is no longer than 5 inches. The length of the loops is at least 6 inches and the tubes have inside diameters between 1/4 inch and 5 inches and a total area of at least 25 square inches. Near the outlet of the condenser, the tube bends upwardly by approximately a diameter to create a water holding portion in the lower most loop of the condenser to restrain condensate and maximize heat transfer.

Abstract: An electric immersion heater (10) is provided for heating fluids, such as water in a livestock watering tank. The electric heater includes a heater subassembly (26), a protective cover (39), and a power cord (21) having a power plug (24). The heater subassembly (26) includes a heating element (14) having first and second ends (16A and 16B) and a molded metallic case (12 or 12A) enclosing the heating element (14). The protective cover (39) encloses and hermetically seals the operative connection of a thermostatic switch (18), the first and second ends (16A and 16B) of the heating element (14), and first, second, and third conductors (22A-22C) of the power cord (21). The thermostatic switch (18) is bonded in heat-receiving proximity to the molded case (12 or 12A). Potting compound (38) disposed intermediate of the thermostatic switch (18) and the fluid to be heated is provided as a thermal barrier for restricting the heat flow from the fluid to the thermostatic switch (18).

Abstract: A food warmer is provided which includes a metal food tray having side and bottom walls and a mouth at the top opening upwardly. A hollow well or sump vessel is provided around the food tray. The sump vessel is formed from a highly filled thermosetting plastic resin to provide a rigid monolithic body comprising at least about 15% and preferably about 30% to 80% by weight of an inert mineral filler, e.g. calcium carbonate (CaCO.sub.3) and fiberglass, and about 20% to 50% by weight of a thermosetting plastic resin so that the thermal conductivity of the food tray is at least about 50 times greater than that of the sump vessel. The sump vessel has bottom and side walls that enclose the sides and bottom of the food tray and is adapted to hold liquid, specifically water, as a heat transfer medium. An electric heating element is supported from a wall of the sump vessel between the walls of the sump vessel and the food tray for heating the food when energized.

Abstract: A method and apparatus to melt and withdraw petroleum residue from a storage site at a convenient location while causing the residue from more distant locations to melt and flow in a stream, to the removal location. A heated wand is utilized to heat the petroleum residue. The wand has one pivotally supported end and is moved in an arc about the pivotally supported end across the storage site with removal of heated petroleum residue occurring at substantially the center of the arc.

Abstract: A detachable metallic safety guard for use with a portable electric immersion heater is formed as an endless metallic band defining an open central area for receiving the heating element of the heater with the inner periphery of the band in spaced surrounding relationship to the heating element. The vertical height of the band is greater than the height of the heating element and the band is provided with openings allowing fluid to circulate therethrough. The guard is adapted to be directly attached to the heating element by a pair of clips carried by a diametric crossbar secured at its ends to the band. The band includes at least two tabs extending radially inwardly for providing peripheral support for the heating element. The heater may be a portable floating heater.

Abstract: An electric heating attachment for electrically heating the exterior portion of a sewer vent of a building to keep the vent from clogging from snow and/or ice and frost that may accumulate on the building roof. The attachment has an elongated rod insertable into the vent a with an electric heating tape extending along the length thereof. Laterally extending arms on an upper portion of the rod engage the top edge of the vent to limit the extent of the insertion of the rod into the vent. The section of the rod extending above the lateral arms terminates in a hoop portion having a portion of the heating tape extending therealong to heat the area immediately above the sewer vent to keep this area open to the atmosphere by melting the snow and/or ice above the vent.

Abstract: An engine block heater is for an engine block having passage walls which define a fluid passage. The engine block has a heater socket which extends from the outer surface of the engine block toward its interior. The heater socket is separated from the fluid passage by the passage walls. The engine block heater comprises a heater housing having an exterior heating surface. The exterior surface has substantially the same shape as the heater socket enabling insertion of the heater housing into the heater socket and substantial heat transfer contact between a substantial portion of the exterior heating surface and the heater socket. A connector mounting is attached to the heater housing. The connector mounting is adapted for connection to an electrical power source. The heater housing has a heating element therein which can be heated by electrical connection of the electrical power source to the connector mounting enabling the heater housing to transfer heat to the engine block.

Abstract: A food warmer is provided which includes a food containment vessel or pan having side and bottom walls and a mouth at the top opening upwardly. A hollow well or sump vessel is provided around the food containment vessel. The sump vessel has bottom and side walls that enclose the sides and bottom of the food containment vessel, and is adapted to hold liquid, specifically water, as a heat transfer medium. An electric heating element is provided in the sump vessel between the walls of the sump vessel and the containment vessel for heating the food when energized. The sump vessel is preferably spaced from the food containment vessel to define a chamber between them. The electric heating element is positioned in the chamber, preferably at a location spaced apart from the food containment vessel to heat the food containment vessel by means of radiant and convection heating and by conduction when the sump vessel is filled with water.

Abstract: A sheathed heater wherein before the sheathed heater is assembled, an oxide film is formed on the inner peripheral surface of a metal pipe, and/or the outer surfaces of an internal heater and lead pins thereof which are inserted into the metal pipe by heating them in the presence of oxygen or by applying chemicals thereto, and a heat resistent insulation material member is filled in a space formed between the metal pipe and the internal heater. The color of the oxide film thus formed is light brown, brown or black.

Abstract: A preheat device for preheating an internal combustion aircraft engine having an air intake pipe connected to a cylinder head by threaded mounting bolts is configured as a replacement bolt with a zinc - plated body having a bolt head and threaded shank. The body is made of steel heat treated to grade 8 hardness and tempered at apprximately 1,050 degrees F. and had an axial bore open at the head and extending toward and into the shank. An electric heating element surrounded by a stainless steel sheath is positioned in the bore. The shank has a thread with a flat root to provide a wall thickness approximately 0.060 inch. Each cylinder of the engine is provided with a preheat device in place of a mounting bolt and the preheat devices are connected to each other by a wiring harness connectable to an external power source. When energized the heating element of each preheat device generates heat that in transferred through the screw threads to the cylinder head of the engine cylinder.

Abstract: An electric water heater includes a cylindrical tank with an inner surface defining a water chamber having a central vertical axis. Three sets of three electric immersion heating extend radially inwardly into the water chamber from the inner surface. The heating elements of such set define generally horizontal planes vertically spaced apart along the vertical axis. The heating elements of each set lie in angularly spaced generally vertical planes intersecting the central axis and being spaced approximately 120.degree. apart with the inner ends of the respective heating elements being in overlapping spaced relationship along the vertical axis to provide the most heat at the center of the chamber where it is most needed.

Abstract: A process to clear pipelines carrying fluids viscous and/or rich in organic residues includes the introduction of a heating element inside a pipeline carrying the fluids through a coupling spool which is intercalated in the fluid-carrying pipeline. Simultaneously an electric current is applied to the heating element so that the heat generated by the heating element is transmitted to the viscous fluid or to the compacted residual mass inside the fluid-carrying pipeline, causing the detachment of those residues from the internal wall of the pipeline and re-establishing the conditions for fluid flow.

Abstract: An advance warning control system for controlling the liquid level in a heating tank including an electrical immersion heater to provide a source of radiant energy, a control means operably associated with the immersion heater and the control means including a first normally open bi-metallic switch and a second normally closed bi-metallic switch which together operate to provide an advance warning upon energization of the first switch to give a predetermined time interval before energization of the second switch.

Abstract: A device for accelerating the action of common expansive mortars (M) (used as a replacement for explosive products for demolition and cutting operations on blocks of rock or concrete) comprises at least one heating element (1), which is introduced into the hole (3) within the action of the mortar (M) is to be exerted, in order, to heat the mass of said mortar (M) sufficiently to accelerate the chemical reactions which determine the expansion thereof.

Abstract: The temperature control device comprises heat transfer shells, each of which consists of two shell sections, each of which consists of a metal casting, in which a single temperature control element is embedded. The temperature control element has been formed from a tubular blank to comprise at least one loop and is formed with locating surfaces, which are exposed to recesses formed in the inside and outside peripheral surfaces of the shell section. Owing to that design the metal castings may be made by die casting under relatively high injection pressures and with a much smaller wall thickness so that the inside peripheral contacting surfaces of the shell sections can much more snugly contact the plasticizing cylinder or the nozzle and a temperature change can be effected at a higher rate.

Abstract: An apparatus and a method of assembling a panel heater for use in a corrosive environment includes a planar heating element, a planar non-conductive carrier for supporting a conductive ground plane thereon, a planar heat sink supporting the heating element, and a fluoropolymer envelope enclosing the heating element, the carrier, the ground plane and the heat sink to protect same from corrosive environments. The heat sink and carrier have a coefficient of expansion which is substantially equal to minimize the effects of unequal expansion and contraction of the heater.

Abstract: An improved cartridge heater comprising a electrical resistance heating wire coil enclosed in a stainless steel cylindrical sheath and having bonded thereto a coating containing a solid lubricant and a binder. The solid lubricant providing for ease of removal of the cartridge heater from a bore hole into which it has been inserted for use and providing a barrier to corrosion between the cartridge heater and the metal of the apparatus in which the bore hole is located.

Abstract: A heated rotor is provided to heat and circulate a substance comprising a shaft and at least one electrically heated rotor member supported on the shaft. The rotor member comprises an outer electrically conductive casing and at least one inner electrical conductor, electrically insulated from the casing. The or each inner conductor is electrically connected to the outer electrically conductive casing at an unsupported extremity of the rotor member. The shaft provides separate electrical connections to the or each inner conductor and the casing to enable an electric heating current to flow in the inner conductor between the or each unsupported blade extremity and the shaft.

Abstract: A precooked-food warmer for baby and diet food which is contained in an openable, rigid container comprises a housing that can be fixed to the container and in which is located an electrical heating unit. The unit is equipped with connectors such that energy is supplied to the unit and with a heat-conducting means to transfer heat from the heating unit to liquid or semi-liquid food in the container. A transfer member of a rigid heat-conducting material that is immersible in the food and is detachable from the heating unit is also provided. Preferably, the transfer member defines at least one sword-like section of large surface area that is immersible in the food.

Abstract: An aquarium heater includes a heating coil and a thermostat formed in a glass tube, a thermo-sensitive resistor distantly connected to the thermostat for ensuring a reliable sensing of water temperature in the aquarium without being thermally influenced by the heating coil, and a thermal type circuit breaker provided in a circuit of the thermostat and the heating coil for safely switching off a power supply to the heating coil once the thermostat is out of order to prevent killing of fishes raised in the aquarium.

Abstract: A heater assembly for heating a container of corrosive fluid includes a housing adapted to be located in a container of fluid to be heated, a sealed chamber located in the housing, a heater located in the chamber, an electrically conductive sleeve assembly secured to the housing, and a flexible conduit extending from the sleeve assembly and providing a passageway for conductors providing a source of power to the heater assembly. The flexible conduit includes an electrical conductor connected to ground which is located in the sleeve assembly and the sleeve assembly is swaged to compress the sleeve assembly into the electrical conductor to ground to the electrically conductive housing via the sleeve assembly.

Abstract: A cartridge heater for insertion within a heater bore-hole or cavity having a peripheral cavity wall surface. The cartridge heater includes an elongated generally cylindrical sheath having a heating element disposed therein and having an internal spring chamber intersected by a pair of elongated slots formed in the sheath. A generally V-shaped spring member is disposed within the spring chamber and has a pair of arcuately shaped arm portions projecting outwardly through the elongated slots for frictional engagement against the wall surface of the cavity to retain the cartridge heater within oversize cavities. The spring chamber may be formed as an extension of the forward or rearward ends of the cartridge sheath.

Abstract: An improved mechanical joint structure is provided and adapted for positively retaining a heating element within a bore of a body of a glow plug. The glow plug includes a body, a heating element and a ferrule. The ferrule is sealingly positioned radially between an internal surface of the body bore and a peripheral surface of the heating element. The glow plug further includes a compressing structure for positively compressing an internal surface of the ferrule against the peripheral surface of the heating element in response to the heating element being forced into the body bore by, for example, the gas pressure developed in an operating engine combustion chamber.Unlike conventional brazed or interference joints used in typical glow plugs, the present invention provides a normal force (F.sub.n), for sealing the heating element, and an axially-directed frictional force (F.sub.f), for retaining the heating element, which both increase as the heating element is forced deeper into the body bore.

Abstract: An injection molding thermal gated nozzle having a nose portion which extends forwardly to the cavity. The nozzle has a melt channel which extends through the nose portion to form the gate. An integral electric heating element has a forward portion with a generally rectangular cross section and a number of adjacent coils which form an inwardly tapered inner surface. Part of the inner surface of the forward portion of the heating element forms an inwardly tapered portion of the melt channel adjacent the gate. This direct contact of the heating element with the melt reduces considerably the cycle time of the thermal gate. The forward portion of the heating element is shaped by compressing it between tapered dies. It is then mounted between forward and rearward portions of the nozzle, and the assembly is integrally brazed together in a vacuum furnace.

Abstract: A tubular electric resistance heater includes a tubular sheath enclosing an electric heater coil. As protective overheat safety device is provided at an end of the sheath and includes an electrically conductive tube disposed in a cavity in the end of the sheath and having a closed end electrically connected to the heater coil. A rod-shaped member made of a thermally deformable material extends through the tube from the closed and projects out of the other end of the tube into activating engagement with a normally closed switch located externally of the tubular sheath and electrically connected in series with the tube and thereby the heater coil. Excessive heater coil temperatures cause the rod-shaped member to deform and actuate the switch to its open position to deenergize the heater coil. The rod-shaped member may be made to a memory-alloy or a plastic which changes its structure, e.g., shrinks, or melts at a certain temperature.

Abstract: Both a system and method for simultaneously heat treating a plurality of heat exchanger tubes in the tubesheet of a steam generator are disclosed herein. The system generally comprises a plurality of heater probes receivable within the open ends of the tubes, each of which has a bladder means for detachably securing the probe within the tube, a plurality of hose-like probe guide assemblies positionable over the open ends of the tubes for guiding the heater probes into the tubes, and an end effector having a cup-shaped coupler connected to a robotic arm for delivering the probe guide assemblies over the open ends of different tubes. The ability of each of the heater probes to detachably mount itself into proper position within its respective heat exchanger tubes advantageously frees up the robotic arm so that it can quickly and sequentially install a number of probe guide assemblies and heater probes in different locations within the tubesheet.

Abstract: An immersion heater (1) for use in a chemically corrosive environment. An electrically conductive heating element (7) is immersible in the environment (C) and is capable of a watt-density of at least 30 watts per square inch when current flows through the element. A metallic sheath (9) covers the heating element. A coating (11) is applied over the sheath. The coating is capable of maintaining its coating properties not only when the heater is immersed in the environment, but also when the watt-density of the heating element exceeds 30 watts per square inch, and the temperature of the environment exceeds the boiling point of water.

Abstract: An apparatus for treating silicon wafers in an acid bath, comprising at least one advantageously quartz tank (1) for containing an acid in which the wafers are immersed and with which electrical resistors (14) are associated for heating the acid, the tank (1) being positioned during use in a usual process bench or wet hood (3). The tank (1) comprises tubular ducts (5), advantageously of quartz, which are closed at one end (6) and positioned transversely in the tank (1), and which open at (7) into one of its sides (8), the tubular ducts (5) being arranged to removably receive the electrical resistors (14), which are removably connected to the process bench.

Abstract: A submersible electric aquarium heater includes an open-ended glass tube enclosing an electric resistance heater carried by an axially disposed former. First and second bungs seal the ends of the tube. A printed circuit board carrying an adjustable electronic thermostat is positioned in the tube by first and second locators each including an annular spacer engageable with the tube and a centering post. The centering post of the first locator is insertable within the first bung, while that of the other is fixedly inserted into an end for the axially disposed former. The temperature setting of the thermostat is adjusted by a device mounted for rotation in the tube by the first bung and first locator and including a drum provided with indicia visible through the tube wall to indicate the set temperature.

Abstract: A heater for heating water in an aquarium tank is provided with a thermostat which includes a bimetal strip carrying one contact and another strip carrying another contact. Upon deformation of the bimetal strip in response to temperature changes, the contacts are closed to connect the heater with an electrical supply circuit. The distance between the contacts is initially set by a rotatable cam acting on a curved portion of the bimetal strip. A cylindrical body which supports the cam to rotate the latter is provided with a helical groove in which is engaged an indicator captured in an elongated axial slot formed in a support of the cylindrical body. The support has at least one scale on its surface visible through a glass container of the heater. When the cam is rotated to change the distance between the contacts this change is indicated by the position of the indicator on the scale.

Abstract: A water distillation apparatus has an outer chamber and an inner chamber suspended within the outer chamber by support arms. The inner chamber suspends a heating element to create steam. Heat is transferred from the inner chamber to the outer chamber, wherein the heated water in the outer chamber is allowed to degassify. Degassification removes unpleasant tasting chemicals from the water before distillation. Openings are provided for air circulation to remove the gasses. A condenser is also suspended by the support arms. The stem exits the inner chamber and goes into the condenser. A fan provides air circulation through the condenser. The outer chamber is not penetrated by any openings, thereby precluding the possibility of any leaks. The support arms bear on the outer chamber walls; the inner chamber is removed from the outer chamber for cleaning simply by lifting up. In one embodiment the outer and inner chambers are made of a ceramic material to better regulate heat transfer.

Abstract: An electric cartridge heater for use as an immersion heater in a steam table tank has a tubular elongate stainless steel sheath with a curved inner surface attached to a riser tube adapted to be connected to a wall of the tank and contains an electric heater element. A copper heat transfer member having an enlarged, curved surface complementary to the inner surface of the sheath is urged into close, intimate thermal contact therewith and transfers heat from the sheath to a bimetal thermostat for turning off the heater element in response to a rise in temperature of the sheath above a predetermined level.

Abstract: In a metallic sheathed electric heating element assembly having a resistance element, a sheath surrounding the resistance element, pulverulent electrically insulating material within the sheath and surrounding the resistance element, the insulating material being tightly compacted and extending within the sheath short of an open end thereof, and a terminal pin electrically and mechanically connected to an end of the resistance element within the compass of the sheath, the terminal pin is made in two parts, an inner part to which the resistance element is connected, and an outer part spaced from the inner part, and a thermal switch or cut off electrically connected to and in series between the inner and outer parts of the pin within the sheath but spaced toward the open end from the compacted insulating material, the thermal switch being in good thermal contact with the inner part of the terminal pin.

Abstract: A brewing tank which has a regenerative heater inserted into the tank out of the tank through the wall of the tank having heat insulation, and a brewing regenerative heater which has a regenerator having a regenerative bobbin, a heater wound on the outer periphery of the regenerative bobbin and a regenerative conduit coated on the outer periphery of the regenerative bobbin wherein the regenerator is provided in an outer cylinder. Thus, the brewing tank and the brewing regenerative heater can suitably and efficiently manage the temperature of unrefined soy in a tank.

Abstract: The heating element (14) is in the form of a helical winding (31) made of a resistance heating wire which constitutes the central core of a coaxial cable (32) having a tubular metallic outer sheath and an insulating material interposed between the central core and the outer sheath. The coaxial cable (32) constitutes a helical winding (31). The apparatus can be used in particular for the heat treatment of the small bends of a bundle of tubes in a steam generator in a pressurized water nuclear reactor.

Abstract: A boring device for a lining material in a branched portion of a lined pipe such as a gas-conduit or a city water pipe line to which the lining material has been applied, which device includes a tension coil spring 1, a compression coil spring 2 being connected to the tip of the tension coil spring and having a spring constant smaller than that of the tension coil spring, a head element 5 in the form of a circular truncated cone being connected to the tip of the compression coil spring 2 and having an electric heat-generating device 3 coated with a thermoplastic resin and a single or plural transmission wires 9 being connected to the heat-generating device 3 and being passed in a loosened state through the tension coil spring 1 and the compression coil spring 2, the transmission wires 9 being fixed within the tension coil spring 1 at plural points, and a device N provided in rear of the tension coil spring for rotatably extending the device.

Abstract: A longitudinally flexible electrical heating element for a dryer is provided which permits the heating element to be inserted into and removed from a vertical air inlet conduit located behind the dryer drum from the front of the dryer. A front panel of the dryer is removed and the heating element is inserted or removed through an inlet aperture in the air inlet conduit which opens into the interior of the cabinet.

Abstract: A floating electric water heater for heating livestock watering tanks which maintains the watering tank substantially ice free during low temperatures, thereby providing access to water by a plurality of animals. More particularly, the heater includes a housing supporting an electric heating element for immersion in water to be heated and to a device in the housing for monitoring and regulating operation of the heating element. The device in the housing comprises a temperature responsive switch, which is located in the housing out of contact with the water, and a thermal conductor having both a first end affixed in a thermally conductive manner to a portion of the heating element immersible in the water and a second end affixed in a thermally conductive manner to the temperature responsive switch.

Abstract: A heating system for curing rocket motors includes a plurality of separate lectrical resistance heating elements such as heating rods or cal-rod heaters. The system is floor mounted and has a cantilever supported heating section that is temporarily positioned and sealed within the interior of a rocket motor. The rocket motor is then slowly rotated wherein relative rotation between the rotating rocket motor and the stationary heating section is provided. A plurality of uniquely positioned heating elements are selectively activated at predetermined power levels to tailor proper heating of all interior surfaces of the rocket motor.