Abstract: An inhalation device that generates an aerosol from a base material including an aerosol source, includes: a heating unit configured to heat the base material to generate the aerosol; and a control unit configured to control an operation of the inhalation device. The control unit is configured to perform: first heating control for controlling a temperature of the heating unit with a temperature lower than a lowest temperature at which the aerosol is generated being set as a target temperature, and second heating control for controlling the temperature of the heating unit with a temperature higher than the lowest temperature being set as the target temperature. The first heating control is performed when authentication processing related to availability of the inhalation device is being performed, and the first heating control is ended and the second heating control is performed when the authentication processing is completed.

Abstract: An aerosol-generating device includes a body housing a power source electrically coupled to an electrical charging port, a heating cavity provided with an insertion opening, a heating system for heating said heating cavity, and a sliding mechanism including at least one sliding lid slidably mounted on the body. The sliding mechanism is selectively operatable between at least a using position where the electrical charging port is covered while the opening is exposed and an electrical loading position where the opening is covered while the electrical charging port is exposed. The sliding mechanism is configured so that in any of its positions at most one of the opening and the electrical charging port is exposed.

Abstract: An electronic cigarette or vaporizer may include a shell and a cartomizer receivable within a chamber within a portion of the shell. A basin may be included in the cartomizer to hold a vaporizable fluid, dry substance, or other vaporizable substance such as a wax. A heating element may be provided within the basin which may have a flexible non-conductive material and a flexible conductive material.

Abstract: The disclosed garments are designed to address the need for athletic upper body garments that do not create or highlight bulging in the wearer's body. These garments comprise an advantageous bottom edge that is defined by a fold crease rather than an elastic band. Methods of making the garments are also disclosed herein.

Abstract: A garment includes a front panel having a top edge, a bottom edge, a first side edge, and a second side edge. The garment further includes a back panel having a top edge, a bottom edge, a first side edge, and a second side edge, the back panel coupled to the front panel. A first limb portion extends from the front panel bottom edge and the back panel bottom edge to form a first limb opening, and a second limb portion extends from the front panel bottom edge and the back panel bottom edge to form a second limb opening. The front panel and the back panel are constructed from a first fabric, and the first limb portion and the second limb portion are constructed from a second fabric having a greater stretch characteristic than the first fabric, the second fabric including a seamless lower edge.

Abstract: An elbow and forearm protection device includes an arm strap that is wrapped around a user's upper arm when the user is playing the game of baseball. A member is attached to the arm strap and an elbow cup is integrated into the member to protect the user's elbow from impact of a baseball while playing the game of baseball. A wrist strap is attached to the member and a palm cup is attached to the wrist strap to receive the edge of the user's palm when the wrist strap is worn around the user's wrist.

Abstract: A pair of athletic shorts with removable “Air-activated warmers” is presented. The elastic shorts have a pillow-pocket lap compartments to the posterior thigh areas, on the inside of the garment. The 2? pillow-pocket lap with sideway opening to outside seam for easy insertion of “Air-activated warmers.” This will allow continuous heat to an athlete's hamstring muscles, during competitive play to minimize hamstring group muscle strains and injuries.

Abstract: A garment to protect against drowning is described includes an item of clothing, an inflatable lung and an inflator. The item of clothing includes a front face intended to cover the abdomen of a user, and a rear face intended to cover the back of the user. The inflatable lung has two abdominal floats connected to each other by a neck portion. The inflator is used to inflate the inflatable lung and is configured to inflate the inflatable lung automatically when the inflator is in contact with water. The front face of the item of clothing includes a receptacle shaped to receive the abdominal floats of the inflatable lung. The receptacle opening out via two openings arranged to allow the inflatable lung to be detachably joined to the item of clothing by insertion of each abdominal float into the receptacle via the respective opening.

Abstract: An insert for sports equipment includes a 3D-printed lattice structure comprising at least one lattice layer designed using computer aided design software and customized according to user preference as to at least one of a size, shape, a thickness and a density of the at least one lattice layer. In some embodiments, the insert further comprises a base layer and/or a backing layer. The insert provides customizable protection, mobility and comfort to the sports equipment to be used in consumer pre-owned sports equipment; or in the process of manufacturing new sports equipment—for example, if a manufacturer chooses to deviate from their traditional/original materials and replaces them with 3D printed components (the insert).

Abstract: A system including a knee pad integrated in a garment is disclosed. The garment includes a front part and a rear part. The front part and the rear part connect via a side seam and an inseam. Each of the side seam and the inseam includes a first member. The knee pad includes a casing. The casing has a convex surface forming an interior region for receiving the knee of a user. Further, the casing includes second members extending from its distal end. The casing is positioned over the knee of the user wearing the garment and the second members connect to the first members at the front part of the garment. The first member and the second member include a hook and loop mechanism, a zipper mechanism, etc. In one embodiment, the first member is made to fold to prevent it from being exposed when not in use.

Abstract: A compression scrub shirt and compression pants may be provided. The compression scrub shirt may include a shirt body, a left sleeve, a right sleeve, a left compression sleeve stitched into a left shoulder of the shirt body and extending out underneath the left sleeve, and a right compression sleeve stitched into a right shoulder of the shirt body and extending out underneath the right sleeve. The compression pants may include a pants body, an elastic waist band, and compression leggings sewn or stitched above the elastic waist band. The compression leggings may extend downward inside the pants body.

Abstract: A four-cornered garment has detachable fringes. The garment includes a piece of clothing with a central cut out for a head and four corners and each corner of the piece of clothing has a slit therein. Each slit includes a first side, a second side, a mitred vertex; and a closure formed of an overlap between the first side and the second side. The closure meets at the mitred vertex. When the closure is closed, the overlap holds one of the detachable fringes in place.

Abstract: An embodiment provides a reversible garment belt, the reversible garment belt including: an elongated belt strap having two ends and two longitudinal edges, the elongated belt strap including: a first layer including a front side and a back side; and a second layer having a front side and a back side, wherein the back side of the second layer is attached to the back side of the first layer, wherein the second layer is made of a material different than a material of the first layer; and a buckle attached to one of the two ends of the elongated belt strap, wherein the buckle includes a reversing capability that allows for the elongated belt strap to be reversed such that one of: the front side of the first layer and the front side of the second layer is outwardly facing. Other aspects are claimed and described.

Abstract: The present disclosure provides a novel wig net cap sewing process, which comprises the following steps: 1, sewing a first hairnet and a second hairnet in combination to form a hairnet; 2, sewing a fixing band and a hair band; 3, sewing a first elastic net, a second elastic net and a third elastic net in combination to form an elastic net; 4, sewing and fixing the hair band on an extension net; 5, sewing the extension net, the fixing band and the elastic net in combination; 6, marking the upper position in the middle of the hairnet with a brush; 7, sewing the hairnet and elastic net; 8, trimming the hairnet after sewing in combination; 9, sewing the selvage along the shape path; 10, trimming the elastic net after sewing; 11, post processing.

Abstract: A button removal jig can disassemble a button into plural parts when the button attached to a fabric is removed from the fabric. The button removal jig includes: a base; a press receiving portion arranged above the base and descending from an initial position when it is pressed; a separation plate arranged below the base and ascending and descending together with the press receiving portion; and a deformation-applying portion extending downward from the press receiving portion for deforming the button. The base includes a first button placing portion for placing the button. The separation plate includes a second button placing portion, which is provided at a position corresponding to the first button placing portion.

Abstract: A headwear assembly for independent use by a person with a disability is provided. The headwear assembly includes headwear configured to cover at least a portion of a head of the person. The headwear assembly further includes a first assistive feature and a second assistive feature. The first assistive feature and the second assistive feature are located on opposing lateral sides of the headwear and are configured for use in applying the headwear assembly and/or removing the headwear assembly from the head of the person. A method of manufacturing a headwear assembly configured for independent use by a person with a disability is also provided. The method includes providing a headwear configured to cover at least a portion of a head of the person. The method further includes operatively connecting a first assistive feature and a second assistive feature on opposing lateral sides of the headwear.

Abstract: One variation of a method for fabricating a dermal heatsink includes: fabricating a substrate defining an interior surface, an exterior surface opposite the interior surface, and an open network of pores extending between the interior surface and the exterior surface; activating surfaces of the substrate and walls of the open network of pores; applying a coating over the substrate to form a heatsink, the coating comprising a porous, hydrophilic material and defining a void network; removing an excess of the coating from the substrate to clear blockages within the open network of pores by the coating; hydrating the heatsink during a curing period; heating the heatsink during the curing period to increase porosity of the coating applied over surfaces of the substrate; and rinsing the heatsink with an acid to decarbonate the coating along walls of the open network of pores in the substrate.

Abstract: The present invention generally relates to a cap adapted to be worn by a user with hairstyles comprising a protruding portion of hair, such as a high ponytail or dreadlocks. The cap comprises a rear aperture located substantially adjacent to the crown wherein hair is unobstructed to protrude. The rear aperture comprises an internal and external lining made from a frictionless material such as satin or silk that minimises frictional damage to the protruding hair. The cap may further comprise a headband constructed from a polyurethane foam such as memory foam, an external lining of the headband being satin or silk. The cap may yet further comprise an inner surface that is completely lined with satin or silk to prevent frictional damage to the user's hair and scalp.

Abstract: A snowboard tracking helmet device is disclosed, which is a helmet for snowboarding or skiing that prevents head injuries, suffocation due to avalanches, and facilitates learning new techniques while riding, as described. The snowboard tracking helmet device comprises a helmet component that is configured in a rounded shape similar to a conventional snowboard helmet. The helmet component includes Bluetooth capabilities which allows users to link up to their smart devices and issue verbal commands to activate the features of the heads-up display. The helmet component comprises a variety of sensors including a vital sign monitor, oxygen sensor, sensors that receive verbal commands, GPS capabilities, and an impact sensor. An avalanche beacon face shield on the helmet component provides a heads-up display to demonstrate various snowboarding tricks in real time, provide a map of the location and provide UV protection.

Abstract: The present disclosure relates to a method and a tracking system for determining position and orientation of a helmet while moving on a vehicle, wherein inertial data of the helmet is measured, by an inertial measurement system of the helmet, during movement of the helmet, wherein inertial data of the vehicle is measured, by an inertial measurement system of the vehicle, during movement of the vehicle, and wherein the position and orientation of the helmet with respect to the vehicle is determined by a processing system, using the inertial data of the helmet and the inertial data of the vehicle.

Abstract: An innovative protective football helmet includes a durable shell having an impact attenuation system, a visor system with a visor, a lower chin bar assembly, and internal impact attenuation assembly. The connection of the visor to the shell is “tool-less,” meaning that no unique tool is required for coupling or removing the visor system. The visor system is not coupled to the lower chin bar assembly, which allows the visor to independently flex and independently elastically deform relative to the chin bar assembly. The visor is configured to match a substantial extent of the frontal shell region, thus the visor does not need to be substantially deformed during the installation process, which eliminates the introduction of additional stresses on the visor during the installation process. The visor also replaces a significant upper extent of a conventional facemask that is both heavy and costly to manufacture.

Abstract: A clip system for attaching accessories to headgears is provided. The clip system comprises a clip assembly having a first clip attachable to a first accessory, a first clip-receiving adaptor attachable to a headgear, and an accessory adaptor attachable to the first clip-receiving adaptor. The first clip-receiving adaptor receives and fastens the first clip. The accessory adaptor receives and fastens an accessory to the first clip-receiving adaptor.

Abstract: A helmet for a rider of an on-road or off-road vehicle protects the rider's head. The helmet also may include various features for enhancing the riding experience. For example, the helmet may include electrical connections for power various features of the helmet. Additionally, the helmet may include earmuffs which reduce road or other noises during operation of the vehicle.

Abstract: A helmet includes a helmet body having a front opening, a closing member attached to the outer side of the helmet body so as to close the opening, and an exterior member attached. The helmet body includes a first outer surface, a first attachment surface to which the closing member is attached, and a second attachment surface which is located between the first outer surface and the first attachment surface and to which the exterior member is attached. The exterior member includes a second outer surface continued to the curved surface shape of the first outer surface, and a side surface. The second outer surface and the side surface form a first angle toward inside of the helmet body. The first outer surface and the second attachment surface form a second angle toward inside of the helmet body. The second angle is larger than the first angle.

Abstract: Aspects herein are directed to, among other things, a knitted component for an article of footwear. The knitted component includes a first knit layer having openings exposing portions of a second knit layer. The first and second knit layers may have different yarn with different properties, such as different colors. On at least one side of the opening, the first knit layer may overlay and be separable from the second knit layer such that a pocket is formed, which may extend continuously into the opening. Stretching the knitted component may expose additional portions of the second knit layer through the openings.

Abstract: The disclosure relates to an anti-sway golf shoe.

Abstract: The present disclosure is directed to articles that include a cured coating that includes a matrix of crosslinked polymers and optionally a colorant (e.g., pigment particles or dye or both). The cured coating can include a matrix of crosslinked polymers. The cured coating is a product of crosslinking a coating composition comprising uncrosslinked polymers (e.g., a dispersion of uncrosslinked polymers in a carrier to form the matrix of crosslinked polymers), wherein the uncrosslinked polymers are crosslinked to form the matrix of crosslinked polymers. The matrix of crosslinked polymers can be elastomeric. The present disclosure is also directed to articles including these bladders, methods of forming these bladders, and methods of making articles including these bladders, where the bladders include the cured coating.

Abstract: A sole structure for an article of footwear includes an upper cushion extending from a first end to a second end, a lower cushion having a first segment attached to the upper cushion adjacent to the first end and including a tray extending towards the second end of the upper cushion, and at least one bladder disposed between the tray of the lower cushion and the upper cushion.

Abstract: A sole structure for an article of footwear defines a footbed and includes a bladder extending from a first end in a forefoot region of the sole structure to a second end in a heel region of the sole structure and a chassis including a lower chassis having a first outsole segment attached to the bladder in the forefoot region and a lower cushioning element attached to the bladder in the heel region.

Abstract: A ballet pointe shoe has an upper which includes a tunnel having an open mouth by way of which a shank insert can be removably and replaceably installed in the tunnel. The tunnel may extend into at least a portion of the base of the toe box of the shoe. The mouth of the tunnel may be revealably concealed beneath an insole and may be accessed via the throat and foot compartment of the upper for installing, removing or replacing a shank insert without even partial deconstruction of the shoe. The shank insert may be one selected from a set of shank inserts which includes ones having different flexural rigidity profiles. An elastic loop may be routed-under a portion of the shank insert extending from the mouth of the tunnel or under a ledge which may be disposed beneath the insole and extends rearward of the mouth. In some embodiments a lower portion of said elastic loop may be releaseably captured between the ledge and a rear portion of said shank insert.

Abstract: A footbed for guiding a user to place footbed accessories. The footbed includes a flexible elongate body configured to support an underside of a foot, the body having an upper surface configured to support the underside of the foot, and a lower surface opposed to the upper surface. The lower surface comprises a footbed accessory region providing a visual indication for placement of a footbed accessory within the footbed accessory region.

Abstract: A knitted component for an article of footwear comprises a knit element and a tongue integrally knitted with the knit element. The knit element includes a lateral throat portion overlapping a lateral edge of the tongue and a medial throat portion overlapping a medial edge of the tongue. The lateral throat portion and the tongue are joined by a first knit structure, and the medial throat portion and the tongue are joined by a second knit structure. The first and second knit structures each include one or more courses having a plurality of knit stitches. Each knit structure may also span multiple adjacent courses. A method of manufacturing the knitted component is also described herein.

Abstract: An apparatus for automatically adjusting tension on retention member to hold multiple objects together. Examples include using retention apparatus to obtain optimal fit and use of a human wearable item such as article of footwear. Sensors may be used to sense changes in movement of the article of footwear, of the person wearing it, or of a third object such as a vehicle carrying the person. A retention member may surround at least a portion of the objects, and an actuator may be included that automatically rotates a rotating member such as a gear or pulley that may be coupled to the retention member. The rotating member may be configured to automatically adjust tension on the retention member many times per second based on control signals from control logic responsive to the sensors.

Abstract: A buckle configured to hold a wrapped weightlifting belt and provide fine adjustments to the snugness or tightness of the weightlifting belt is disclosed. The buckle may include an adjustable element, which allows the buckle to pull-in or ease the two ends of the weightlifting belt. The adjustable element may be a worm screw that can be rotated by a user to move a car of the buckle relative to the body of the buckle. The car may have legs that hold onto one end of the weightlifting belt via holes in the weightlifting belt, while the other end of the weightlifting belt is fixed to a fastener plate of the buckle. The buckle may include a wedge and lever design to latch the buckle closed. Additionally, the buckle's rugged design allows for the manufacture thereof with polymeric materials using low-cost manufacturing techniques, like injections molding.

Abstract: The present disclosure is related to a snap system including a mating component and a snap component that connect by means of a snap fit or otherwise. The mating component simplifies the assembly process by combining a structural component and an attachment point. The snap component is associated with a removable component that mates with the attachment point of the mating component. The snap system includes a mating component that combines a structural component to secure a material and an attachment point to secure a snap component. The design of the structural component allows the mating component to be used with a variety of materials having a variable thickness. The mating component is a versatile feature as the structural component self-adjusts to the thickness of the material provided. The snap system decreases the amount of components necessary for manufacturing which may decrease the cost and improve the visual appeal.

Abstract: A system and method for generating a customizable educational puzzle comprises a processor and a memory. The processor is configured to generate a customizable educational puzzle with determined attachment points based upon educational inquiries. The processor is further configured to request and receive puzzle art work, along with complimentary X and Y axis information which is then used to generate the customizable physical educational puzzle.

Abstract: A watch strap and a watch are disclosed. The watch strap includes a first strap body and a second strap body each having two ends. One end of the first strap body and/or the second strap body is detachably connected to a strap connector. The other end of the first strap body is detachably connected to the other end of the second strap body through cooperation of a coupling mechanism and a button mechanism, so that the first strap body and the second strap body are selectively moved closer to each other to be locked or moved away from each other to be unlocked. In this way, the user can complete the disassembly and assembly of the watch in just one operation.

Abstract: A connection structure includes: a connection pin that includes a first part and a second part between which a step is formed and that connects a first target and a second target by being inserted in an insertion hole; and a pin locker movable in a moving direction in a recess formed in either the first or second target. The pin locker has a pin engaging part that engages with the step of the connection pin and a pin insertion part. One of the recess and the pin locker has a first abutting part, and another has a first abutted part. When the pin locker is at a specific position and the first abutting part abuts the first abutted part, at least either an orientation or a position of the pin insertion part is limited such that the second part is allowed to pass through the pin insertion part.

Abstract: The present invention concerns a fastening member for a strand of a bracelet, adapted to be removably connected to a watch case. The fastening member has a housing in which are held a first and a second pad arranged so as to be able to slide in a direction transverse to the length of the strand and to cooperate respectively with a first and a second pivot secured to the lugs of the watch case; an elastic member arranged so as to move the first and second pads away from each other; and a lock arranged, on the one hand, to lock the fastening member when the lock is in a locked position and, on the other hand, to allow the fastening member to be disconnected from the watch case when the lock is actuated to be brought into an unlocked position and a force allowing the fastening member to be separated from the watch case is applied against the elastic member.

Abstract: An electronic device includes: a housing including a pin; and a strap detachably coupled to the housing. The strap includes: a coupling groove that includes a first end that surrounds the pin and a second end that is open toward a first surface of the strap; and a button including an inclined surface that is inclined with respect to the first surface of the strap and slidable relative to the pin. A first portion of the button is movable into or out of the coupling groove, wherein a gap between the first portion of the button and an inner surface of the coupling groove is expanded as the button moves in a first direction toward a second surface of the strap opposite to the first surface of the strap, and wherein the gap is reduced as the button moves in a second direction opposite to the first direction.

Abstract: A clasp (100) for a watch bracelet including a cover (1) on a first side to a bracelet strand (200) and on a second side to a folding system (300), a connecting device assembled between the bracelet strand and the cover, and including a sledge (3) sliding in a longitudinal direction of the clasp between a first position wherein the sledge is engaged in the cover of the clasp (100), and a second position wherein the sledge is disengaged from the cover (1) of the clasp (100). The clasp (100) comprises a lever (2), provided with a toothed element (20), when pressed along a direction perpendicular to the bottom of the cover, causes the toothed element (20) to move from a rest position, in which the toothed element (20) is in mesh with a rack toothing, to an actuated position, in which the toothed element (20) is released.

Abstract: The present disclosure relates to gemstones, and envisages a method of enhancing brilliance, fire and scintillation of gemstones and gemstones (100) made by the method. The gemstone (100) comprises a metal collet (104) defined by a body having a substantially flat surface (116) and at least one pocket (114) defined in the flat surface (116). At least one jewel (118) secured in the at least one pocket (114). The gemstone (100) further comprises a dome-shaped crystal crown (102) defining an operatively substantially flat base (110), wherein the base (110) is complementary to the flat surface (116) of the collet (104). The dome shaped crystal crown (102) is securely mounted on the collet (104) to enhance the brilliance, fire and scintillation of the gemstone (100). The gemstone (100) comprises a girdle (106) defining the junction between the collet (104) and the dome-shaped crystal crown (102).

Abstract: A portable sunbathing enclosure that includes an enclosure body having a plurality of slender frame members coupled together and operably configured to form a statically fixed upright structure having a fabric material coupled to the plurality of slender frame members to define multiple walls around the enclosure and a bottom wall, wherein inner surfaces of said walls are light reflective and enclose and define a sunbathing cavity for a user. The enclosure defines an upper opening disposed to provide ambient access to the sunbathing cavity and may include a cover selectively removably coupled to the enclosure body, configured to cover the upper opening, and of a transparent material to permit the entry of ultraviolet light.

Abstract: A device for enjoying an outdoor space, wherein the device provides a parasol connected to a distal end of a pole, wherein a parasol fan is disposed along an inner surface of the parasol so as to direct airflow downward in the direction of the pole, and wherein a net disposed downward of the parasol fan, wherein the net defines a compartment between the net and a portion of the inner surface of the parasol that the parasol fan occupies.

Abstract: A bag including a flexible bag body and having a structured closure including rigid ribs. The ribs are arranged in a spatial relationship to selectively stiffen and support the bag body in selected areas to define an overall shape of the bag, and to define at least one unsupported operative region of the flexible material that will be highly flexible due to the lack of overlying strengthening ribs, and act as the structured closure. The ribs may be spaced asymmetrically to define a preferred operative region for folding at an intended location. The bag body may define pockets or other internal organizer structure having an open top and the preferred operative region may be defined in vertical alignment with the open top of the organizer to provide easy access to the open top of the organizer. Bags may have any suitable shape and may include one or more structured closures.

Abstract: A frame for a pull-rod luggage case, including pair of pull rods parallel to each other, a pair of castor seats, an upper beam, a lower beam, and a handle; each of the pull rods at least includes an outer rod and an inner rod telescopically positioned in and out of the outer rod; a lower end of each outer rod is connected to a corresponding castor seat; each of two ends of the handle is fixedly connected with an upper end of a corresponding inner rod; outer rods, the upper beam, and the lower beam define a skeleton.

Abstract: The present disclosure is about assemblies containing shiftable parts like three sided open-frames or independent bars with stub-axles. In some embodiments shiftable parts are designed to ‘slide’ within encompassing tubes. In other embodiments shiftable parts are designed to be ‘turnable’ by attaching them on pivots. These shiftable components are used for mounting general wheels or multi-wheel star assemblies on them. Such assemblies can be either attached to or built into movable objects like luggage or robots to facilitate their movement over stairs. When the wheels are positioned to keep the body of the movable object away from the edges of the stairs, the object can be moved upstairs and also downstairs without getting scratched. When the wheels are shifted to another position, the objects can be easily moved over flat surfaces. One of these positions will be for storing the object in lesser space.

Abstract: A display case for displaying an item includes a first case section, a second case section, a first liner coupled to the first case section, and a second liner coupled to the first case section, and the first liner and the second liner are configured to suspend the item between the first case section and the second case section.

Abstract: The present disclosure provides an electric hair curler. The electric hair curler includes a handle shell and a hair curling tube. A first electric connector is arranged in the handle shell. The hair curling tube is rotatably connected to the handle shell. A heating assembly and a second electric connector are arranged in the hair curling tube. The heating assembly and the second electric connector rotate synchronously with the hair curling tube. The heating assembly is electrically connected to the second electric connector. When the hair curling tube rotates relative to the handle shell, the second electric connector rotates relative to the first electric connector, and the second electric connector is electrically connected to the first electric connector to turn on a circuit where the heating assembly is located.

Abstract: The present device provides a rod for perming eyelashes, the rod including a base formed in a plate shape having a length corresponding to a width of an eye, and a width corresponding to a length of an eyelash, the base having an upper surface formed curvedly, and a plurality of guide convex portions each formed in a rod shape perpendicular to a longitudinal direction and disposed in parallel on the upper surface of the base so as to be spaced apart from one another at preset intervals, in which the base is formed such that a cross-section perpendicular to the longitudinal direction has an semi-elliptical shape, and one side horizontal surface and the other side horizontal surface have different curvatures.