Abstract: A refrigerating appliance is provided that includes an inner compartment for storing refrigerated or frozen goods, a cold generator, a refrigerating appliance control system for operating the cold generator, a mains connection for supplying the cold generator and the refrigerating appliance control system with an electrical voltage, and an ice-making machine arranged in the inner compartment. The ice-making machine includes its own control system for its own operation, which controls all functions of the ice-making machine independently of the refrigerating appliance control system. A connection is also provided from the ice-making machine and the ice-making machine control system to the mains connection of the refrigerating appliance.

Abstract: The invention relates to a device for controlling a condensate lift pump (9), comprising a means for detecting at least two condensate levels in a container (20), and a means for activating and for stopping said pump (9) according to said levels, in which said detection means comprises a capacitive detector (101) comprising at least three electrodes (GE, RE, EOFF, EON, EA): a ground electrode (GE); a first level detection electrode (EOFF); and a second level detection electrode (EON), and a processing means (102) comprising a means for measuring the capacitance (C2, C3) between the electrodes. According to the invention, the lengths of said first level detection electrode (EOFF) and second level detection electrode (EON) are defined so as to come into contact with said condensates, when the condensates respectively reach said first level and said second level in said container (20); these electrodes are produced on distinct supports not having a submergible physical continuity between them.

Abstract: There is provided a control device of a permanent-magnet type synchronous motor that sets a synchronous operation current at start-up in response to a current limiting value determined from the temperature of an inverter that supplies three-phase power to the permanent-magnet type synchronous motor, that monitors an output voltage or an output current of the inverter during a rotation stabilizing period after start-up, and that updates the synchronous operation current using this output voltage or output current.

Abstract: A multi-stage compressor is provided that reliably prevents liquid compression in a higher stage compression mechanism and also prevents compression efficiency degradation resulting from overheating of injection refrigerant and from the lubricating oil being raised up together with the injection refrigerant. An injection circuit is branched into a plurality of circuits. A first circuit thereof is communicatively connected to an inside space of a closed housing that is at the same side as the higher stage compression mechanism with respect to an electric motor, and a second circuit is communicatively connected to an inside space of the closed housing that is opposite from the higher stage compression mechanism with respect to the electric motor. The first circuit and the second circuit are provided with a switching mechanism for switching the injection circuit to the first circuit or the second circuit according to the dryness of the injection refrigerant.

Abstract: Disclosed is an air conditioner that provides a displaying apparatus that can present information on a predicted value of the integrated electricity per unit time, a predicted value of the electricity charge per unit time, and a predicted value of the amount of CO2 emission per unit time, at the start of operation.

Abstract: Heat pump assembly for seasonal balancing of temperatures in buildings, includes a heat pump (1) having a cold side and a warm side, respectively. The heat exchangers (2, 3) are connected to the cold and the warm side, respectively, in that one of the heat exchangers (3) is connected to a heating/cooling element (4), in that the other heat exchanger (2) is connected to a heat/cold buffer (6), in that the heat pump (1) is of the type liquid-liquid, and in that a valve assembly (7) is arranged in the heat pump (1) to optionally connect the warm or cold side of the heat pump (1) to the heating/cooling element (4), whereby the heating/cooling element (4) optionally may heat or cool.

Abstract: A self-contained water-to-water heat transfer system is provided that mixes hot water produced by a heat exchange with cold output fluid expelled from the heat pump to make source fluid. More specifically, in order to reduce the fluid flow rate required within a heat pump and substantially prevent freezing of evaporator coils within the heat pump, source water fed into the heat pump is taken from a mixture of the output hot water that was generated in the heat pump and the cool water exiting the heat pump. The system alleviates the need to employ a ground loop outside of a structure that is required by traditional geothermal heating systems.

Abstract: The present invention relates to a refrigerated display case of the type comprising a bearing base and a top glass compartment with an intermediate wall provided with a series of openings, designed to receive from up downwards corresponding ice cream containers made of transparent materials, characterised by the fact that each transparent container is externally provided with projections situated at a height lower than the opening, in such a way to prevent the containers from being completely inserted from up down inside the corresponding opening obtained on the bearing base.

Abstract: A refrigerated display merchandiser is provided that includes a microchannel evaporator positioned within the merchandiser such that both the fins and the tubes of the microchannel evaporator are vertically oriented or substantially vertically oriented with respect to a vertical axis of the refrigerated display merchandiser, thus more reliably ensuring removal of condensate from the microchannel evaporator.

Abstract: A single bracket serves to both attach a TXV bulb to an outer surface of an outlet header and to place a securely hold the distribution assembly in a fixed position with respect to the TXV bulb. A pair of clam shell clamping members on opposite ends of a central member are put in position and clamped to hold the TXV bulb tightly in place against the outlet header and to clamp around the equalizer of the distributor assembly, thereby resulting in a rigid interconnection which maintains the desired positions for each of the components.

Abstract: A data center includes an air-conditioned room, two rack rows formed on a floor surface of the air-conditioned room and each composed of a plurality of racks arranged in a horizontal direction, each of the plurality of racks housing electronic devices in multistage configuration, an air conditioner for conditioning air in the air-conditioned room to eliminate heat generated from the electronic devices housed in the plurality of racks, and a hot zone in the air-conditioned room. The hot zone is defined by the two rack rows arranged on the floor surface of the air-conditioned room such that rear sides thereof are opposite each other at a distance, a ceiling disposed above the two rack rows, two panels disposed at both ends of the two rack rows in the horizontal direction and extending from a lower end of the two rack rows to the ceiling, and two partitions disposed at an upper front top end of the two rack rows and extending to the ceiling.

Abstract: An ice bank of a refrigerator is provided. The ice bank includes an ice accommodation chamber storing ice pieces made by an ice maker, and an ice pressing unit circulating the ice pieces by pressing the ice pieces for preventing sticking of the ice pieces in the ice accommodation chamber.

Abstract: Disclosed is a refrigerator having an ice maker including a main body having cooling chambers therein; doors by which the cooling chambers are opened or closed; and an ice maker comprising a frame disposed in the door, a tray rotatably coupled to the frame, and an overflow preventing unit formed at at least either one of the frame and the tray. Accordingly, it is capable of preventing water in the tray from being discharged out, preventing the moving portion from being restricted, which is caused by freezing of the discharged water, and facilitatingly taking out the made ice.

Abstract: A heat exchanger for an ice machine has the form of a cylinder. In some embodiments, the cylinder is made from an extrusion of a metal such as an aluminum alloy. The heat exchanger includes inner and outer cylindrical walls and one or more refrigeration passages positioned between the inner and outer walls. The inner and outer walls are separated from each other by connecting structures defining the refrigeration passages. The heat exchanger can be extruded as a rectangular panel and subsequently formed into a cylindrical form. Alternatively, the heat exchanger can be extruded as a cylinder, or as an arcuate cylindrical segment in which several of such segments are subsequently joined together (as by welding) into a cylinder. Ice machines that feature ice formation on both the inner and outer walls of the cylinder are also disclosed.

Abstract: A modular cooling system includes a compressor and a microchannel heat exchanger for cooling a heat generating device such as a semiconductor.

Abstract: A cool air supplying fan motor assembly and a refrigerator having the same are disclosed. According to the cool air supplying fan motor assembly and the refrigerator having the same, because the fan motor assembly is configured to be compact, the capacity of a storage space of the refrigerator can be increased, and because a power line that supplies power to the motor does not interfere with the flow of cool air, the refrigerating efficiency of the refrigerator can be increased and vibration and noise can be minimized.

Abstract: The present invention is a unitary cooling apparatus capable of standard freezing time despite heavy insulation. One embodiment of the apparatus includes a zipper component which extends along the edges of a top surface and bottom surface allowing the top and bottom to be pivoted outward or inward and the cooling apparatus flattened along the seams which connect the sides. A plurality of cube structures positioned along a plurality of channels allows rapid cooling using a minimum of frozen fluid.

Abstract: In order to allow a user to conveniently adjust the elevation of the shelf, simplify the structure not to generate noise, stably maintain the selected position of the shelf, and rapidly and considerably adjusting the elevation of the shelf, the present invention discloses an elevation adjustment apparatus for a shelf in a refrigerator comprises a shaft lengthily provided up and down in the inside of the refrigerator; a shelf moved up and down along the shaft; an operating lever hinged to the shelf and having a through hole through which the shaft penetrates; and an elastic member pushing the operating lever to contact the through hole to the shelf and hook them so that the up and down movement of the shelf is selectively restricted.

Abstract: A refrigerant system incorporating a reheat circuit is also provided with pulse width modulation control to adjust the amount of refrigerant being compressed. In particular, in any dehumidification mode of operation, by activating the pulse width modulation control, sensible and latent components of capacity can be controlled independently and with significantly better accuracy. The present invention provides the ability to precisely tailor both humidity and temperature control to the conditioned space demands utilizing less expensive components and in a more efficient manner than in the prior art.

Abstract: If the degree of opening of an electronic expansion valve (14) continues to remain below a specified degree of opening or if the degree of superheat of an evaporator (15) continues to remain above a predetermined degree of superheat, it is determined that the refrigerant circulation amount is in short supply in the water-cooled operation mode, and an air-cooled condenser fan (21) is tuned on.

Abstract: The present invention discloses a heat exchanging apparatus including a plate type heat exchanger auxiliary vessel arrangement whereby the auxiliary vessel contains fluid in more than one phase to enable the corresponding plate type heat exchanger to be flooded with heat exchanger fluid in order to fully employ its heat exchange surfaces in the task of exchanging heat.

Abstract: In a method of treating a hydrocarbon stream, such as a natural gas stream, a partly condensed feed stream (10) is supplied to a first gas/liquid separator (2), where it is separated into a gaseous stream (20) and a liquid stream (30). The liquid stream (30) is expanded and fed (40) into a second gas/liquid separator (3), and the gaseous stream (20) is split into at least two sub-streams (50, 70). A first sub-stream (50) of the at least two sub-streams is expanded, thereby obtaining an at least partially condensed first sub-stream (60), and subsequently fed (60) into the second gas/liquid separator (3). A second sub-stream (70) of the at least two sub-streams is cooled against a cold stream (120), thereby obtaining an at least partially condensed second sub-stream (90, 90a), which is fed (90, 90a) into the second gas/liquid separator (3) from which a gaseous stream (130) and a liquid stream (100, 100a) are removed.

Abstract: A process and apparatus is provided for enhancing the formation of a uniform population of hollow glass microspheres. A burner head is used which directs incoming glass particles away from the cooler perimeter of the flame cone of the gas burner and distributes the glass particles in a uniform manner throughout the more evenly heated portions of the flame zone. As a result, as the glass particles are softened and expand by a released nucleating gas so as to form a hollow glass microsphere, the resulting hollow glass microspheres have a more uniform size and property distribution as a result of experiencing a more homogenous heat treatment process.

Abstract: A substrate protective film composed of chromium metal is formed on a molding surface of a mold base material composed of cemented carbide. The substrate protective film is oxidized by heat treatment or ion implantation, so that a surface protective film composed of chromium oxide is formed. A pair of molds having such a constitution are prepared. Softened glass is pressed between the surface protective films of the paired molds, so that optical glass elements are molded.

Abstract: The invention relates to a method for producing iridescent crystal glass. The glass products produced with the method of present invention have the advantages of good streamline shape, natural color transition, and excellent visual effect, etc.; the method is helpful for accelerating product upgrade, improving product appearance and visual effects, and enhancing competence of products. Therefore, we paint iridescent crystal ink on glass products, and add patterns suitable for household electric appliances and buildings, thereby greatly improving the appearance of the product. In addition, due to the high safety performance of toughened glass and suitability of patterns and colors, iridescent crystal glass products have been accepted by the consumers gradually. The method comprises the following steps: a. cutting; b. edge processing; c. toughening; d. ink preparation; e. iridescent crystal printing; f.

Abstract: Provide is a heat-resistant roll with improved effectively characteristics, a production method thereof, and a method of producing sheet glass using the heat-resistant roll. A method of producing a heat-resistant roll equipped with a roll portion containing 5% by weight or more of clay includes: a grinding step (S101) of grinding a roll surface of the roll portion; and a surface treatment step (S102) of performing surface treatment of smoothening the ground roll surface in a wet state.

Abstract: A gravity bending mould for bending glass sheets, the gravity bending mould comprising a peripheral shaping rail, the peripheral shaping rail having at least one end section, and at least one auxiliary rail mounted on the peripheral shaping rail, the or each auxiliary rail being respectively mounted adjacent to at least a portion of a respective end section by at least one mount that is adapted to permit relative vertical movement of the auxiliary rail with respect to the respective end section, a tripping mechanism for selectively and temporarily disposing the auxiliary rail in a raised position with respect to the respective end section, and a latch mechanism connected to the tripping mechanism, the latch mechanism being adapted to be engaged by an external actuator to cause relative vertical movement of the auxiliary rail with respect to the respective end section, by operation of the tripping mechanism, so that the auxiliary rail is subsequently disposed in a lowered position with respect to the respectiv

Abstract: A thermally stable chalcogenide glass, a process for making the same, and an optical fiber drawn therefrom are provided. A chalcogenide glass having the composition Ge(5?y)As(32?x)Se(59+x)Te(4+y) (0?y?1 and 0?x?2) is substantially free from crystallization when it is heated past the glass transition temperature Tg or drawn into optical fibers. A process for making the thermally stable chalcogenide glass includes purifying the components to remove oxides and scattering centers, batching the components in a preprocessed distillation ampoule, gettering oxygen impurities from the mixture, and heating the components to form a glass melt. An optical fiber formed from the chalcogenide glass is substantially free from crystallization and exhibits low signal loss in the near-infrared region, particularly at wavelengths of about 1.55 ?m.

Abstract: The invention relates to a process and to an installation for preparing a final glass, comprising a main furnace with electrodes and/or overhead burners, which is fed with main batch materials generating a main molten glass, and a submerged-combustion auxiliary furnace, said auxiliary furnace being fed with auxiliary batch materials, the auxiliary molten glass feeding the main furnace toward its upstream end in the first third of its length, the auxiliary glass being substantially of the same composition as the main glass. The downstream zone of the main furnace is thus used to remove both gases coming from the main glass and gases coming from the auxiliary glass, in order to finish melting the batch stones and impurities contained in the auxiliary glass and to homogenize the two glass streams from their redox standpoint, when this is necessary.

Abstract: In a glass processing method according to the invention, in the case of performing chemical vapor deposition or diameter shrinkage of a substrate glass tube G by relatively moving a heating furnace 20 comprising a heating element 21 for annularly enclosing the circumference of the substrate glass tube in a longitudinal direction of the substrate glass tube G with respect to the substrate glass tube G in which an outer diameter is 30 mm or more and a wall thickness is 3 mm or more and is less than 15 mm and an ovality of the outer diameter is 1.0% or less using a glass processing apparatus 1, a temperature of at least one of the heating element 21 and the substrate glass tube G is measured and the amount of heat generation of the heating element 21 is adjusted based on the measured temperature.

Abstract: According to the invention, a system for forming glass fiber from molten glass is disclosed. The system may include a tip plate, a plurality of tips, and a plurality of support members. The plurality of tips may include a plurality of rows of tips. Each of the plurality of support members may support the tip plate. Each of the plurality of support members may be located between two of the plurality of rows of tips.

Abstract: The Furniture Pad Folding Machine is a dry cleaning chine that is multi-faceted; it can clean and disinfect furniture pads and the machine has the ability to fold furniture pads. The machine is portable and can function on the moving truck and at the warehouse.

Abstract: A laundry treating machine including a laundry treating device (100) and a pedestal laundry treating device (200) is disclosed. The laundry treating machine is configured to achieve simultaneous or selective supply of water and simultaneous or selective draining of wash water for the laundry treating device (100) and pedestal laundry treating device (200). The pedestal laundry treating device (200) supports the laundry treating device (100) beneath and outside the laundry treating device. The pedestal laundry treating device (200) has a volume and a height smaller than those of the laundry treating device (100), and has a laundry treating function.

Abstract: Systems and methods are provided that for enable alerts in an enterprise application system (EAS). An alert system receives a request to enable an alert definition for triggering an alert regarding human resources data in the EAS, monitors human resources data entered into the EAS by a manager via a user interface (“UI”), receives data that triggers the alert, and renders the alert in the UI.

Abstract: A lock is disclosed having components formed integrally with a lock body. One example of such an integrally formed component is a biasing member utilized in the operation of a combination locking mechanism. A lock is also disclosed having an inner and outer body. A variety of outer bodies of different aesthetic appearance may be utilized with the same inner body. The lock disclosed herein may be embodied in a variety of styles, one of which is a padlock.

Abstract: The invention relates to an integrative three-segment tripod. The tripod has a main bracket 1 and at least one stand leg, each stand leg including an upper segment, a middle segment and a lower segment, the upper segment is connected to the main bracket 1, the middle segment is telescopically connected to the upper segment, and the lower segment is telescopically connected to the middle segment, wherein the stand leg further includes a locking unit and a safety device, the locking unit is provided at the joints where the middle segment is joined the upper segment and the lower segment, and can fix the middle segment to the upper segment and simultaneously fix the lower segment to the middle segment, and the safety device is associated with the locking unit, which can keep the locking unit in the fixing state when the locking unit is in the locking position.

Abstract: A door lock includes a door catch system for double door-type helicopter doors that can, when being closed, additionally be displaced perpendicularly to the plane of the door opening into the closed position (flush fitting). The door lock includes a catch element (30) associated with the latch element (31) and actively linked therewith, the catch element maintaining the door ‘caught’ directly in front of its locked position when the door is manually closed until the door is translated to its final closed position via the latch element (31).

Abstract: A locking device having a door catch system for helicopter doors, which are embodied as sliding doors, which are to be additionally moved (flush-fitted) into the closed position at right angles to the plane of the door opening in response to their closing movement, consisting of a catch (15a), which is associated with the latch (13) and which is in active connected therewith, by which catch (15a) the sliding door is “caught” directly in front of its locked position in response to a manual closing process until the sliding door has been transferred into its final closed position via the latch (13).

Abstract: A motor unit (9) and the like are arranged on a frame body (3) covered with a cover (6). A rod guide portion (4) is protruded from the frame body (3). A lock rod (14) is disposed in this rod guide portion (4) so as to be freely movable. Weak portions (17, 18) are provided on the rod guide portion (4) and the lock rod (14), respectively. A deadlock mechanism (30) is disposed closer to a tip end side of the rod guide portion (4) than the guide-side weak portion (17) thereof. The deadlock mechanism (30) includes: a lock pin (31) urged to a deadlock engagement position where a region of the lock rod (14), which is closer to the tip end side than the rod-side weak portion (18), is locked; and a lock control member (33) that inhibits movement of the lock pin (31) to a locked position thereof before the weak portions (17, 18) are cut off, and releases such regulation to the lock pin (31) after the weak portion (17, 18) are cutoff.

Abstract: In order to enable a turning of a key of a lock cylinder onto a driven member (shaft 36) in the lock cylinder only when a proper key is inserted, yet to prohibit the turning in case of an overload, an overload lock is arranged therebetween. The driven member (shaft 36) should specifically actuate functions in the vehicle only if the correct key is used. A threshold rotation torque determines the change between the normal and the overload state. In order to improve the lock cylinder, it is furnished that a disengaging lever (40) is mounted in the cylinder housing (30) in a pivotable manner (42) and can be displaced between two pivot positions in a radial plane defined by the longitudinal axis (13) of the lock cylinder. A locking cam (41) belonging to the overload lock is arranged on the free end of the disengaging lever (40).

Abstract: A high security lock includes a lock bolt movable between extended and retracted positions, a bolt retraction gear coupled to the lock bolt, and a manually-driven gear train. When a controller verifies that user-input information is correct for unlocking the lock, the bolt retraction gear and manually-driven gear train are operatively coupled such that the gear train can drive the lock bolt from the extended position to the retracted position.

Abstract: A lock with a support structure includes a tubular element connected to a handle having a positioning hole and a center hole. The center hole contains a lock set having a rotatable lock core connected to a transmission element. The transmission element has separated first and second sides. A transversally slidable element is installed to the tubular element for receiving a bias pressure of an elastic element, and includes a protruding portion and a bearing portion. The protruding portion can be moved between engaged and non-engaged positions of the positioning hole of the handle. The support structure includes a support portion. If the first side of the transmission element approaches the support portion of the support structure, the bearing portion of the transversally slidable element will approach the second side of the transmission element for limiting the displacement of the transversally slidable element when an external force is applied.

Abstract: The efficient production of ethanol from low-cost biomass (e.g., corn, sugar beets, sugar cane, switchgrass and/or paper) has become increasingly important in making ethanol competitive with gasoline and decreasing the United States' dependence on foreign oil. For example, to reduce the cost of transporting biomass to ethanol production facilities, mobile systems for producing ethanol from biomass are provided. Also provided are small-scale ethanol production facilities. For example, instead of transporting biomass to the production facility, the facility is transported to the biomass or is located nearby the source of the biomass. The ethanol production facilities or components thereof may be transported via land, water, or air. Production of other products, such as hydrocarbons, natural gas, hydrogen gas, plastics, polymers, and proteins, can also be made by the methods and facilities. Any product described herein can be made in finished form or un-finished form and moved, e.g., to a fixed facility, e.g.

Abstract: An improved process for enhancing the plant nutrient value of relatively low analysis organic waste material (e.g., sewage sludge) involves treating the waste material with an acid and base in a pipe-cross reactor. The process more particularly involves mixing the waste material with water to form a slurry (or initially taking the waste material as a slurry); pumping the slurry to a pipe-cross reactor for reaction with a base, acid, and water to form a melt: spraying the melt onto a recycling bed of fines in a granulator and flashing off the water contained in the melt as steam; rolling the melt onto recycled fine particles in a granulator to form granulated particles; and drying these granulated particles to form an enhanced plant nutrient value composition (e.g., a fertilizer or soil conditioner having a greater “NPK” value than the original relatively low analysis organic waste material).

Abstract: This invention relates to a rolling mill apparatus and a method of shape control of a rolled strip which enables satisfactory shape control even in extremely thin rolling. A rolling mill apparatus of this invention has a rolling mill, which rolls a rolled strip P between upper and lower work rolls; a shape detecting portion, which detects the degree of flatness of the rolled strip in the width direction of rolled strip which has been rolled by the rolling mill; a spray portion, having a plurality of spray nozzles arranged along the length direction of the upper and lower work rolls, which sprays the upper and lower work rolls with coolant C; and, a shape control portion, which adjusts the spray amount and/or temperature of the coolant C sprayed from the spray portion based on detected information from the shape detecting portion, to control the shape of the rolled strip P.

Abstract: Cold rolled material manufacturing equipment comprises: an unwinding device (21a) for unwinding a hot rolled coil after acid pickling; joining means (23), disposed on the exit side of the unwinding device, for joining the tail end of a preceding coil (25b) to the leading end of a succeeding coil (22a) unwound from the unwinding device; a rolling mill (10a, 10b) for continuously rolling the coils, with the leading end and the tail end of the coils being joined, in one direction; a strip storage device (50), disposed between the joining means and the rolling mill, for storing a strip S in order to perform continuous rolling by the rolling mill during joining of the preceding coil and the succeeding coil by the joining means; a strip cutting device (28) for cutting the strip to a desired length; a winding device (24) for winding the rolled coil; transport means (30) for withdrawing the coil from the winding device, and transporting the coil to the unwinding device (21a, 21b) so that the coil is rolled a pluralit

Abstract: In order to allow a more targeted intervention in a drawing procedure, in particular on a linear drawing device, the invention proposes a linear drawing machine for the linear drawing of a workpiece through a drawing ring, a drawing unit, in which one or more drawing tools grasp the workpiece and draw it linearly in the drawing direction, being situated behind the drawing ring, the linear drawing device being distinguished in particular by a drawing ring which is situated fixed in relation to the drawing direction during the drawing procedure, preferably perpendicularly, and by a workpiece guide situated in front of the drawing ring in the drawing direction, which is displaceable perpendicular to the drawing direction.

Abstract: Methods and apparatus for high velocity electromagnetic metal forming are described for sealing containers (40). The methods include applying an electromagnetic field to the container (40) to seal a metal containing cap (60) to the container (40). One or more containers (40) may be simultaneously sealed. The apparatus includes an actuator (410) that emits the electromagnetic field to seal the caps (60) to the containers (40). The containers (40) may contain a medicine.

Abstract: Through the invention, a closure device for explosive forming with a connection unit movable relative to the explosive forming die between a working position on the die and a rest position is to be configured, so that the explosive forming die can be closed in simple and reliable fashion and, at the same time, the explosion forces supported. This task is solved by a closure device, in which a wedge structure is guided to move on a static holding structure and is motion-coupled to the connection unit, the resulting movement of the connection unit being directed across the movement of the wedge structure.

Abstract: The object of the present invention is to provide a mandrel mill capable of producing a seamless pipe without flaws such as necking. The mandrel mill of the present invention includes a plurality of consecutively provided grooved-roll stands and a mandrel bar 3 provided in a roll groove array formed by the grooved-roll stands so as to continuously elongate a hollow shell 2. Roll grooves 4 of at least a first stand and a second stand are arranged so as to satisfy conditions represented by the following formulas (1) to (4): b?10a+1.5??(1) b?10a?0.2??(2) b??a+1.5??(3) b??a+1.15??(4) wherein a=S/R1, b=C/(R1?S).