Abstract: The present invention relates to a formwork system (1) comprising a form lining (2) and at least one shaped element (10) which is attached to the rear side (4) of the form lining (2). The form lining (2) and the shaped element (10) have been produced by a 3D printing method. This is preferably carried out in a common 3D printing process, but the form lining (2) and the shaped element (10) can also be produced in separate 3D printing processes, with the shaped element (10) then being attached to the rear side (4) of the form lining (2). This is effected using at least one first fastening element (50). If, by contrast, the form lining (2) and the shaped element (10) have been produced in a common 3D printing process, the additional use of a first fastening element (50) for fastening the shaped element (10) to the form lining (2) is not required.

Abstract: A water heater includes a tank, an insulation blanket, and an outer shell. The insulation blanket includes a preformed foam assembled from at least two pieces of foam, which together surround the tank. The outer shell includes a lower part surrounding the at least two pieces of foam. The at least two pieces of foam have notches extending along outer comers thereof to form channels between the pieces of foam and the lower part. The channels extend from above the tank to a drain outlet from the lower part to conduct any leakage out of the water heater.

Abstract: A jug for a juicer has sealing features so that its contents may be isolated from the environment when it is not being filled or when used for pouring.

Abstract: An annular shaped-charge and blasting housing and a use method thereof are provided. The annular shaped-charge and blasting housing includes a PVC segment and multiple notch grooves. Grooves are notched on a W-shaped PVC segment formed by machining. The notching angle of the groove and the spacing distance between the grooves can be adjusted according to use requirements. And, the W-shaped PVC segment after being cut may not be limited to have eight notch grooves, and the number of the notch grooves of a single one PVC segment can be adjusted according to actual working conditions. The PVC segment can be folded and closed to form the annular shaped-charge and blasting housing. Therefore, the housing of the embodiments is simple in production, the linear segment can be bended and folded by utilizing the plasticity of the PVC material. The manufacturing process of the housing is simple and feasible.

Abstract: An assembly for assembling a winding group of a bar winding for an electric machine is provided. The winding group includes a plurality of bar conductors, each bar conductor having a first leg, a second leg and a bridge portion connecting the first leg to the second leg, and being shaped so that the first and second legs are mutually spread by a predetermined distance. The assembly includes an annular fixture delimiting a plurality of slots, each slot receiving at least one portion of either the first leg or the second leg, a guiding device defining an annular containment housing, receiving at least partially the first and second legs of the plurality of legs of the plurality of bar conductors that are housed in the plurality of slots, forming at least one radial containment wall for the first and second legs.

Abstract: An appliance includes a vacuum insulated structure that has a peripheral edge including a wrapper and a liner. A mullion is operably coupled to the vacuum insulated structure. A reinforcement assembly is operably coupled to the vacuum insulated structure and the mullion. The reinforcement assembly includes a perimeter frame that is operably coupled to the peripheral edge of the vacuum insulated structure, and a central plate that is operably coupled to the mullion. A door is operably coupled to the reinforcement assembly.

Abstract: A modular indefinite volume combined tank is provided, including a tank body module, a tank bottom module and an inflating module, wherein the tank body module is formed by splicing a plurality of wall plates and connectors, and the wall plates and the connectors form a tank body. The tank bottom module includes a strip-type steel plate, concrete cloth, annular steel plate and a cement foundation. The strip-type steel plate is paved on the cement foundation, the annular steel plate is arranged in the upper side of the outer edge of the strip-type steel plate, the annular steel plate is encircled by a plurality of arc-shaped steel sheets, a ring of annular edge is arranged in the annular steel plate to be connected to the upper tank body, and a layer of concrete cloth is arranged between the lower side of the annular steel plate and the strip-type steel plate.

Abstract: Systems for and methods of evacuating air from a muffler while it is being filled with a fibrous material are disclosed.

Abstract: A device for reducing axle failures on motorized vehicles that includes a sleeve that wraps around the axle and a separate single pieces or two-piece axle guard that wraps around said sleeve. The present invention allows the torsional flex that the axle manufacturer intended to occur but prohibits the axle from bending and possibly breaking. The present invention also acts as a shock-absorber for the axle by absorbing energy that is being transferred through the axle during normal use. Absorbing this energy increases the life of the axle and drive-train and reduces the risk of failure during use.

Abstract: A guy wire anchoring device is provided which can be used to hold a tower in place. The device features a container which has a plurality of solid side panels, which are connected to two adjacent side panels using a side hinge mechanism. As a result, the container can be reversably moved from an essentially flat, folded orientation, to an expanded empty container orientation when un-folded. The container also includes at least one base plate which is hingeably mounted to the lower edge of at least one side panel of the container, and which can be moved to a position wherein it at least partially closes the opening at the bottom of said empty container. The container is adapted to be filled with a suitable, local material such as sand, aggregate, or the like, in order to increase the weight of the guy wire anchoring device. The device includes a guy wire anchoring bracket to which guy wires can be attached.

Abstract: A rivet (1) for fixing cementitious sheets to supports is provided, which rivet comprises a metal rivet body (10) with an axial length Lr, metal rivet head (12) and metal mandrel (14), characterized in that the rivet further comprises at least one polymer tubular member (20) having a length Lm in axial direction (30), Lm being less than Lr, said polymer tubular member being coaxially mounted on the rivet body along its length Lm. In addition, methods for fixing a cementitious sheet to a support by means of such rivets are provided as well as uses of such rivets in the building industry. Also, building systems, comprising a support and a cementitious sheet, which cementitious sheet is fixed to the support by means of at least one of the rivets of the invention is provided herein.

Abstract: A refrigeration device includes a water supply device for supplying water to an ice maker in the interior of the refrigeration device. The refrigeration device has an installation recess in an inner wall of the refrigeration device for inserting the water supply device. The installation recess is closed towards an outer wall of the refrigeration device.

Abstract: A prefabricated reinforced concrete-filled steel pipe sleeve joint includes high-strength outsourcing steel pipes, reinforcement restraining plates, high-tensile reinforcements, transformation separation sleeves and an ordinary outsourcing steel pipe, wherein: two transformation separation sleeves are respectively located at an upper end and a lower end of the ordinary outsourcing steel pipe; one of the transformation separation sleeves, which is located at the upper end of the ordinary outsourcing steel pipe, is connected with one of the high-strength outsourcing steel pipes; the other transformation separation sleeve, which is located at the lower end of the ordinary outsourcing steel pipe, is connected with the other high-strength outsourcing steel pipe; the high-tensile reinforcements penetrate through the ordinary outsourcing steel pipe; upper ends and lower ends of the high-tensile reinforcements are respectively extended to interiors of the high-strength outsourcing steel pipes; the high-tensile reinfo

Abstract: Apparatus for providing a predetermined fluid in a void space (450) of an annulus (320) of a flexible pipe and a method for providing a predetermined fluid in a void space of an annulus are disclosed. The method comprises introducing a predetermined fluid into at least one fluid communication passageway (120), e.g. an elongated conduit, in an annulus (320) of a flexible pipe and, via the passageway (120), communicating the fluid into a void space (450) of the annulus at a plurality of axially spaced apart locations, e.g. via a plurality of spaced apart openings in the wall of the elongated conduit, and at a pressure of less than about around 80 psi.

Abstract: A ballast foundation includes a portable rolled steel enclosure formed from multiple sections and further includes internal bracing. The internal bracing is used to support an upright vertical structural member that connects to an external load (such as a frame structure for a solar array) that is supported by the ballast foundation when the enclosure is filled with concrete.

Abstract: Provided is an exhaust gas purification catalyst with excellent durability against exhaust gas including a poisoning substance. The exhaust gas purification catalyst includes a porous substrate, a catalyst coating layer formed on the porous substrate, and a dummy coating layer formed on the outermost surface of the catalyst coating layer. The catalyst coating layer has a carrier and a noble metal catalyst supported on the carrier. The dummy coating layer includes a carrier having at least alumina and does not include a noble metal catalyst. The dummy coating layer is formed to have a length which, from the end on the exhaust gas inlet side, is 10% to 70% of the entire length of the catalyst coating layer along the exhaust gas flow direction.

Abstract: A tube-type ozone generator 1 including an ozone generation unit 30A is provided. The ozone generation unit 30A includes an outer electrode tube 31 and an inner electrode tube 32 provided inside the outer electrode tube with a discharge gap 36 interposed between the outer and inner electrode tubes 31 and 32. The inner electrode tube 32 has a dielectric tube 33 and a cylindrical electrode 34 being in close contact with an inner circumferential surface of the dielectric tube 33. The electrode 34 is removably disposed inside the dielectric tube 33.

Abstract: A system and method of cooling and ventilating for an electronics cabinet is disclosed. In a particular embodiment, the system includes a cooling unit and a distribution unit in communication with the cooling unit to blow supply air through at least one main supply line. The system further includes at least one supply branch line connected to the at least one main supply line, at least one cabinet supply line connected to the at least one supply branch line, and at least one cabinet having an inlet port and an exit port, wherein the at least one cabinet supply line is connected to the inlet port. In addition, the system includes at least one cabinet return line connected to the exit port and a main return line to receive air exiting from the at least one cabinet, wherein the main return line is in communication with the cooling unit.

Abstract: A locking apparatus of an ice bucket of a refrigerator capable of simplifying the structure of the ice bucket while preventing the cool air of the ice making compartment from leaking and the ice bucket from being shaken, the refrigerator including a locking apparatus accommodating portion formed at a lower portion of the ice making compartment, a lever hingedly coupled to the locking apparatus accommodating portion, and an elastic member configured to elastically bias the lever, wherein the lever is configured to interfere with a locking projection of the ice bucket, and a button portion configured to adjust the position of the locking protrusion by rotating the lever, wherein a gasket mounting portion formed around an opening portion of the ice making compartment is formed to be extended to the inner side of the ice making compartment to make contact with the gasket mounting portion in a two-area contact manner.

Abstract: A method of bending a tube arrangement including an inner tube disposed within an outer tube is performed using a bending die having a concave groove including a curved portion extending around a peripheral surface of the bending die, the curved portion of the concave groove having at least one ridge projecting therefrom. The tube arrangement is located within the concave groove and a force is applied to the tube arrangement in a direction toward the curved portion of the bending die to cause the tube arrangement to conform to the shape of the concave groove. The at least one ridge projecting from the concave groove causes the outer tube to deform such that an interior surface of the outer tube contacts an exterior surface of the inner tube, securing a position of the inner tube within the outer tube.

Abstract: Provided is a blanket installation method, which includes a transporting step of transporting a blanket unit (1), in which the blanket (2) and a transport jig (3) are coupled in one body, between an inner tank (60) and an outer tank in a double shell tank, in a suspended condition, and a mounting step of mounting the blanket unit on a shell plate of the inner tank. According to the method, in the event of installing work of the blanket, the improvement in work efficiency and safety can be achieved.

Abstract: A key for assembling at least a portion of a stay-in-place form-work for casting a structure from concrete or other curable construction materials. The stay-in-place form-work comprises a first elongate panel comprising a first edge component and a second elongate panel comprising a second edge component. The first and second panels are connectable in an edge-to-edge relationship wherein the first and second edge components engage one another. The key comprises a plurality of connector components for slidable engagement with complementary panel connector components on at least one of the first and second panels and a locking component for forcing the first and second edge components into a locked configuration as the key is moved longitudinally relative to the first and second panels while slidably engaged thereto.

Abstract: A method for producing a tube (10) from metal, which consists of an inner tube (5) and at least one outer tube (7) surrounding the same, is provided. To create the outer tube (7), a metal strip (2) running in longitudinally is formed around the inner tube (5) moved in its axial direction so as to form a slit tube in such a way that its edges running in the longitudinal direction lie against one another at a slit extending in the longitudinal direction. The slit is welded to complete an outer tube that is closed all around. The inner tube (5) is cooled and the the finished outer tube (7) is reduced in its diameter until it is in contact with the cooled inner tube (5) in at least one reducing stage.

Abstract: An assembly, which consists of a flexible tubular pipe (1) for transporting hydrocarbon fluids including a metal carcass (10) produced by the short pitched helical winding of a profiled strip, the said strip defining a plurality of intervening gaps (10a) between each winding turn (10b), an inner polymeric sealing sheath, at least one metal armour layer, and an outer polymeric sheath, and of a secondary metal tube (2) coaxial to the tubular pipe (1)

Abstract: In a method of producing a cuff of a sphygmomanometer having an automatic cuff winding mechanism, the cuff includes a band-shaped fluid bladder forming a cavity for inserting a user's arm therein, a shape maintenance member wound on the band-shaped fluid bladder, a band-shaped bag wound on the shape maintenance member, and a cylindrical elastic plate housed in the band-shaped bag. The method includes winding the band-shaped fluid bladder on an outer circumferential surface of a cylindrical jig having approximately the same outer diameter as the cavity of the band-shaped fluid bladder, winding the shape maintenance member on an outer circumferential surface of the band-shaped fluid bladder, winding the band-shaped bag on an outer circumferential surface of the shape maintenance member, removing the cylindrical jig from the band-shaped fluid bladder, and housing the cylindrical elastic plate inside the band-shaped bag.

Abstract: In various embodiments, a tubular comprises a tubular outer sheath defining an inner void; one or more core elements or assemblies disposed within the inner void; and a substantially solid filler in various embodiments disposed within and substantially filling the inner void, where the filler is adapted to give the tubular hoop strength in a crush situation and comprises a polymer with a density of at least 1.0. In some embodiments, these core assemblies comprise an extruded polymer layer typically extruded about core elements in a single pass, fitting about them without a sharp edge and defining an outer shape. The resulting tubular can comprise multiple regions which, though substantially filled, are filled with differing fillers densities.

Abstract: In various embodiments, a tubular comprises a tubular outer sheath defining an inner void; one or more core elements or assemblies disposed within the inner void; and a substantially solid filler in various embodiments disposed within and substantially filling the inner void, where the filler is adapted to give the tubular hoop strength in a crush situation and comprises a polymer with a density of at least 1.0. In some embodiments, these core assemblies comprise an extruded polymer layer typically extruded about core elements in a single pass, fitting about them without a sharp edge and defining an outer shape. The resulting tubular can comprise multiple regions which, though substantially filled, are filled with differing fillers densities.

Abstract: The invention relates to a container for a product for dispensing, comprising a relatively stiff outer container (2) having at least one dispensing opening (3), and a deformable inner container (4) to be filled with the product which is accommodated in the outer container and which likewise has a dispensing opening (5). The inner container is connected to the outer container both in the vicinity of the dispensing opening and at least at one location remote therefrom. The connection is formed in that the outer container has an opening (8) through which protrudes at least one fixing element (10) connected to the inner container. This fixing element is pin-like and has an end part of which the dimensions are larger than those of the opening. The invention further relates to a method for manufacturing such a container.

Abstract: A pipeline system is enclosed including unlined or plastic lined pipes. A mechanical metal to metal connection is employed that can provide a fluid tight seal. A pipe coupling may be employed to span the connection. Plastic lined pipes can have their plastic liners connected to form a fluid tight bladder. Electro-fusion may be employed.

Abstract: A spacer for holding an alignment of two concentric cylinders including at least two arcuate spacer segments, each of the at least two arcuate spacer segments having at least one spacer passage for receiving a part of a coupling bolt, each of the at least two arcuate spacer segments fitting between each of two respective end surfaces of two concentric cylinders, each end surface having a cylindrical seat; and a ring with an outer surface adjoining an inner surface of each of the at least two arcuate spacer segments.

Abstract: Exemplary embodiments and various aspects of the present invention are directed towards a pre-insulated control valve and a strainer of a piping system and a method of pre-insulating a control valve and a strainer. The method involves providing at least one a rigid polymeric foam, casting an insulation layer having a predetermining thickness from the polymeric foam designed to reduce thermal conduction between the valve or the strainer and the surface coming in contact with the valve or the strainer, coupling the control valve or the strainer with the insulation layer to provide a pre-insulated control valve or a pre insulated strainer and engaging the pre-insulated control valve or the pre insulated strainer in the fluid distribution system at multiple predetermined locations.

Abstract: A reelable connection between facing ends of opposed pipe-in-pipe sections in which an end wall connects inner and outer pipes of each section to seal an end of an annular space defined between those pipes is disclosed. In each section, the inner pipe protrudes beyond the end wall and the outer pipe and is joined to an inner pipe of the opposed section, leaving opposed ends of the outer pipes of those sections spaced from each other. An insert positioned between the opposed ends of the outer pipes maintains the outer pipe diameter from one section to the other section across the connection. Also, a method of reeling having the steps of making a connection between such pipe-in-pipe sections, positioning an insert to lie substantially flush between the opposed facing ends of the outer pipes, and winding the sections joined by the connection onto a reel.

Abstract: The current invention relates to an insulating container comprising a vessel and a wrap, wherein the vessel comprises one or more protrusions matched to corresponding recesses, wherein the protrusions have a substantially consistent wall thickness, wherein the wrap and the protrusions cooperate to form one or more void spaces between the wall and the wrap, thereby providing insulating properties to the container.

Abstract: A pipe structure includes a carcass made from an arrangement of hoop segments that join to form a series of articulating joints. A hard yet flexible outer shell is formed around the carcass. The hoop segments are reinforced with fiber to increase strength and reduce weight. The shell anchors to the carcass at intervals along its length to hold the hoop segments together, while providing the flexibility needed for deep water and other high pressure pipe applications.

Abstract: A method and a facility for manufacturing rigid tubular pipes having a double casing for hydrocarbon transport. The pipes include an inner rigid tube (42, 242, 342, 442) that is inserted into an outer rigid tube (16, 216, 316, 416). The facility includes a supporting frame (12, 212, 312, 412) for an inlet end of the outer rigid tube and a movable apron (22, 222, 322, 422). The apron includes a catch (38, 238, 338, 438) for catching the rigid tube and inserting it in the outer rigid tube. The apron includes storage members (68, 268, 368, 468) for receiving stored heating cables (69, 269, 369, 469) and the driving force of the apron makes it possible to deploy a portion having the length of the stored heating cables (69, 269, 369, 469) so as to be able to apply the deployed portion, having the length of the heating cables, along the inner rigid tube (42, 242, 342, 442).

Abstract: A method for closing a fuel tank includes providing a base sized to be received within an interior of a fuel tank filler neck, movably mounting a closure structure on the base, and securing a biasing mechanism to the base wherein the biasing mechanism biases the closure structure into a closed position on the base.

Abstract: A ceramic filter element of ceramic material has an exterior surface that is provided with structural elements. The structural elements are produced by a non-cutting method. The structural elements are molded in the ceramic material in the form of grids, periodic patterns, irregular patterns, lettering or labels.

Abstract: A bracket for mounting a curved shower rod on a previously installed straight shower rod. The bracket includes a body having a first member that defines a first bore for receiving an end of the curved shower rod therein, and a second member defining a second bore for receiving a portion of the straight shower rod therein. The first member extends outwardly from the second member at an angle. The second member comprises first and second regions that are movable away from each other to capture a portion of the straight shower rod between them. A securement mechanism locks the first and second regions together to prevent the bracket from disengaging from the straight shower rod. A second mounting bracket is similarly engaged on an opposite end of the straight shower rod and receives a second end of the curved shower rod therein.

Abstract: A catheter comprises a flexible polymer catheter body including a proximal shaft section and a distal working section, a wire support structure embedded within the distal working section of the catheter body, a proximal adapter mounted to the proximal shaft section of the catheter body, and a wire disposed within the catheter body. The wire has a proximal end and a distal end. The proximal end of the wire being operably connected to the proximal adapter, and the distal end of the wire is anchored to the wire support structure.

Abstract: An electrical conduit coupling comprising a casing and first and second locks is provided. The casing includes opposed first and second openings, and first, second and third crimps. The first, second and third crimps are formed in the casing to provide a smaller diameter in the casing at each crimp. The first lock includes a flange and a plurality of fingers extending from the flange. Each finger includes a first surface and second surface opposite the first surface. A rise portion is located on the first surface of each finger and a tab surface extends from the second surface of each finger. Each finger includes a tip surface extending opposite the first surface and from the second surface.

Abstract: An anchor system is shown for use with a pre-insulated piping system having an inner steel carrier pipe surrounded by a layer of insulation and then by an outer protective jacket. The anchor system includes an inner carrier pipe for insertion within the length of the piping system at a selected point. A steel anchor sleeve surrounds a portion of the length of carrier pipe and insulation. It terminates at one end at an outwardly flaring anchor plate which is subsequently embedded within a concrete anchor block. A steel end cap is welded to a second, opposite end of the sleeve and to the inner carrier pipe at a point along the length of piping which is outside the concrete anchor block and which is spaced apart from the location of the anchor plate, whereby heat from the high temperature fluids in the piping is transferred to the end cap at a location along the length of piping which is distant from the location of the anchor plate.

Abstract: A retaining structure for a honeycomb structure includes a honeycomb structure, a retainer mat, and a housing. The honeycomb structure is a member made of a ceramic material. The retainer mat is in contact with the honeycomb structure and directly retains the honeycomb structure. The housing is in contact with the retainer mat and directly retains the retainer mat. The housing is made of aluminum. The housing includes an inner wall, an outer wall, and a coolant passage. The inner wall is in contact with the retainer mat. The coolant passage is located between the inner wall and the outer wall. An inflow port of the coolant passage is located at one end of the housing. A discharge port of the coolant passage is located at the other end of the housing.

Abstract: A double-wall pipe for a transportation means which includes an outer pipe and an inner pipe extending therein. The outer pipe has two pipe segments which are formed like half-shells and are joined together to form the outer pipe along the longitudinal edges thereof. In this way, it is possible to make both the outer pipe and the inner pipe of metal, such that the wall thickness of the inner pipe can be relatively small.

Abstract: A vacuum insulated cabinet structure for refrigerators and the like includes a plurality of vacuum insulated panels. The cabinet structure may include an “O” or “U” structure that is formed by folding a large panel assembly. The panels may comprise side walls that are heat-sealed together around the perimeters of the panels to form air-tight spaces having a vacuum.

Abstract: A pipe end fitting assembly that includes an outer body having an outer surface, an inner surface defining a first bore, and an end surface, and an inner body having an inner surface defining a second bore and an outer surface. A portion of the inner body outer surface is secured to the outer body inner surface. A passage formed in the outer body includes a first portion extending from the end surface and parallel to the first bore, and a second portion extending from the outer body outer surface to the passage first portion. A pipe end is disposed around and secured to a portion of the inner body outer surface. A jacket is disposed around the pipe and has an end secured to the outer body outer surface. The passage portions are in fluid communication with each other and a space between the jacket and the pipe.

Abstract: A method for producing a tubular catalytic converter, which includes a monolith wrapped in a mat and is disposed in a housing, includes forming a stepped longitudinal fold on a longitudinal side of a housing blank, wherein the longitudinal side on both sides of the fold to be formed is clamped by electrodes of opposite polarity across the fold. Electrode pairs on one side of the fold to be formed are then offset with respect to electrodes on the other side of the fold and the electrodes of opposite polarity move closer together, while a current is flowing between the electrodes of opposite polarity, heating the material in the fold. Opposing longitudinal sides of the tubular housing are then materially joined along the stepped longitudinal fold with the overlap to produce the housing for the tubular catalytic converter.

Abstract: A circular sheet metal duct having a sealant applied across the longitudinal seam. The sealant will improve the efficiency and will reduce or eliminate air leakage from the longitudinal seam. The sealant is applied during the manufacturing processes so that an installer does not have to seal the duct work. The method of manufacturing the sealant is provided.

Abstract: The disclosed subject matter includes a structure and method for making a dual-lumen needle from single lumen needles to take advantage of the much higher economies of scale. Variations include two needles joined by a flow junction and one needle and a single cannula joined by a flow junction. In addition disclosed are methods of using a dual-lumen needle in a two needle access for blood treatment is disclosed in which at least venous flow is provided through a dual-lumen needle with arterial flow just sufficient to provide air infiltration detection in the event of withdrawal of the dual-lumen needle.

Abstract: A rotating machine has a barrel casing and at least one component carrier disposed therein. The component carrier is aligned and supported within the barrel casing using a plurality of carrier alignment fixtures which have alignment shafts that extend through the barrel casing to the component carrier. Each alignment shaft has an eccentric key pin extending from a distal end thereof and an alignment key rotatably-mounted to each eccentric key pin. The alignment keys mate with corresponding keyway slots defined on the component carrier such that when the carrier alignment fixtures are rotated axially, the corresponding alignment keys bias against the keyway slot and shift the position of the component carrier.

Abstract: A tool for grinding an inner diameter even when holders having grindstones are axially connected. A gap enclosed by the inner peripheral surface of a divided tool holder, a draw bar and O-rings is formed in a state in which the draw bar is inserted into a tool holder in which a plurality of divided tool holders are connected in series. A filler is filled into the gap to fix a support bush to the divided tool holder. An adjustment screw of each arm held circumferentially away from each other on the divided tool holder is turned to adjust a distance between a pin and the arm, and the radial projecting amount of each of grindstones is adjusted. The projecting amount is adjusted such that the plurality of grindstones rotate along the same rotational trajectory and the center of the rotational trajectory corresponds to the axis of the draw bar.