36 results about "Metal nail" patented technology

The utility model discloses an integrated nail for building installation, which relates to the technical field of building installation, and comprises a metal nail and a nail head shell arranged at the top of the metal nail, the nail head shell comprises an outer shell and a propellant powder shell, the inner top of the outer shell is provided with an assembly cavity, and the propellant powder shell is assembled at the inner top of the assembly cavity. The inner diameter of the end, close to the metal nail, of the assembly cavity is shrunk to form an energy gathering part, the bottom end of the propellant powder shell is located at the top of the energy gathering part, so that the distance between the tail end of the metal nail and the propellant powder shell is increased, and at the moment of firing, high-energy gas generated by gunpowder gas expansion achieves gas gathering through the energy gathering part; according to the integrated nail fastener, the metal nail can be quickly ejected outwards along the launching tube, the percussion performance is improved, meanwhile, plastic lengthening is utilized, energy of propellant powder is gathered, the gap between the plastic lengthening section and an inner hole of the launching tube after percussion is reduced, and the purposes that the performance is improved and the integrated nail fastener adapts to various launching tube calibers are achieved.

The present utility model relates to the technical field of construction mounting fasteners, and specifically, to a novel metal nail sleeve for affixing a thermal insulation layer, comprising a nail s

The invention discloses a microstrip hybrid circulator with high isolation, and belongs to the technical field of microwaves and millimeter waves. Comprising a metal plate with a nail bed structure and a mixed circulator main body, and the metal plate comprises a cover plate metal plate and a metal pin array arranged on the face, facing the mixed circulator main body, of the cover plate metal plate; a gap is formed between the metal plate and the mixing circulator main body; the hybrid circulator main body comprises a micro-strip hybrid circulator, a dielectric substrate and a reference ground plane, the micro-strip hybrid circulator is arranged on the side, close to the metal plate, of the dielectric substrate, and the reference ground plane is arranged on the side, away from the metal plate, of the dielectric substrate. The periodic nail bed structure is designed to suppress coupling of surface waves and high-order modes, so that the isolation of the hybrid circulator is improved, and the hybrid circulator is suitable for multiple microwave and millimeter wave fields such as millimeter wave radar systems and the like.

The application discloses a wide-angle beam scanning Luneberg lens antenna with linearly arranged feed sources and a method thereof, wherein the antenna comprises: a first metal plate, the shape of the first metal plate is a truncated circular truncated cone, and the cutting surface is perpendicular to the upper and lower bottom surfaces of the circular truncated cone; a second metal plate, the shape of the second metal plate is the same as that of the first metal plate; a cutting surface is formed between the cutting surfaces of the two metal plates; a Luneberg lens is arranged between the first metal plate and the second metal plate, and the shape of the Luneberg lens matches the shape of the upper bottom surface; two metal nails are symmetrically arranged on the two sides of the cutting surface; and the feed source of the Luneberg lens antenna is arranged on the cutting surface and can move between the two metal nails. The wide-angle beam scanning Luneberg lens with stable gain is obtained by the Luneberg lens with the focal point being shifted to the inside of the lens, the feed source being arranged on the two sides of the focal arc and the two metal nails being introduced outside the cutting lens edge, and can be widely applied to the technical field of antenna engineering.

Metal Spike Garden Sprinkler

The utility model discloses an automatic bartacking machine for cap production, which relates to the technical field of clothing bartacking machines, and particularly comprises a base, a bartacking machine body is arranged on the upper surface of the base, a needle plate is arranged on the upper surface of one side of the base, a needle rod is arranged at the bottom of the bartacking machine body, and the needle rod is arranged on the upper surface of one side of the base. A pressing rod is arranged on the lower surface of one side of the bartacking machine body, a mounting sleeve plate is fixedly mounted on the outer wall of one side of the base, a connecting plate is slidably mounted on the inner wall of the mounting sleeve plate, and a positioning cover is fixedly mounted at the end of the connecting plate. According to the cap sewing machine, the rotating disc can rotate along the end portion of the positioning cover, in the process, the metal nails on the outer surface of the rotating disc can connect and fix a sleeved cap garment, a worker can press and rotate the rotating disc and drive a processed cap to rotate, rapid adjustment of a cap sewing area is achieved, and the sewing efficiency is improved. And the sewing and processing convenience degree of hat clothes can be effectively improved.

The invention relates to a bird repelling bomb adopting plasma ignition and an ignition method thereof.The bird repelling bomb comprises a main shell (11), the main shell (11) is provided with a closed explosive cavity used for being filled with first explosive (14), an ignition hole communicated with the explosive cavity is formed in the main shell (11), and a conductive metal nail (15) is arranged in the ignition hole; the metal nail (15) seals the ignition hole, one end of the metal nail (15) makes contact with the first explosive (14), the other end of the metal nail (15) is exposed out of the main shell (11), and the metal nail (15) is used for making contact with a plasma igniter when the bird repelling bomb is ignited.

The utility model discloses an intelligent prestress carbon fiber cable anchorage device which comprises a guide frame, a sliding bolt is movably inserted into the guide frame in a penetrating mode, a bolt is installed on the upper portion of the sliding bolt in a threaded mode, a pressure sensor is arranged between the guide frame and the bolt, and the pressure sensor is embedded into the guide frame. And metal nails are inserted into the guide frame. The guide frame comprises a frame body, a guide block is fixedly connected to the interior of the frame body, an insertion opening is formed in the rear portion of the frame body, after screws penetrate through the sliding bolts and are installed on a building, when the target carbon fiber cable is stressed to pull the sliding bolts, the guide frame further downwards guides the sliding bolts, and therefore the sliding bolts further clamp the target carbon fiber cable; therefore, the bolt loosens the pressure sensor, pressure data collected by the pressure sensor becomes smaller, an alarm is given out through the intelligent device after the small data is smaller than a threshold value, and data can be conveniently provided for the intelligent device when the sliding bolt is subjected to overlarge tension.

The waste collecting box for metal nail production comprises a collecting box with one end provided with an opening, the two ends of the collecting box are fixedly connected with the end of one side of a transmission shaft respectively, and the other side of the transmission shaft is fixedly connected with a limiting ring in a sleeved mode. The device comprises a collecting box, a plurality of fixing assemblies are arranged on the two sides of an opening of the collecting box respectively, the fixing assemblies are evenly distributed, protective shells are fixedly connected to the outer walls of the two sides of the collecting box respectively, cleaning assemblies are rotationally arranged in the protective shells, hand wheels are fixedly connected to one ends of the cleaning assemblies respectively, and the hand wheels are rotationally arranged outside the protective shells. The collecting box is knocked through the cleaning assembly, residual scrap iron in the collecting box is vibrated out through vibration force generated by knocking, cleaning personnel can clean the scrap iron without entering the collecting box, manpower for manual cleaning is saved, and the personal health of the cleaning personnel is protected.

The utility model is suitable for the technical field of batteries, and discloses a sealing nail, a battery and a vehicle. Wherein the sealing nail is used for being mounted on a top cover body of the battery so as to seal a liquid injection hole in the top cover body. The sealing nail is an integrally-formed metal nail. The metal nail comprises a nail body and a nail cap, the nail body is used for penetrating through the liquid injection hole, the nail body comprises a ventilation rod part, and the ventilation rod part is used for enclosing with the inner side wall of the liquid injection hole to form a ventilation channel for gas to pass through when the ventilation rod part penetrates through the liquid injection hole; the nail cap is arranged at one end of the nail body in a protruding mode and used for being welded to the top cover body. Only one sealing nail provided by the utility model needs to be used in the helium return sealing process, so that the quantity of materials used for sealing the liquid injection hole is reduced, and the operation of the helium return sealing process is simplified. Besides, during helium detection, when a gap exists in welding of the nail cap, helium in the battery can be leaked out through the gap between the nail body and the liquid injection hole and the welding gap of the nail cap in sequence, and therefore it is guaranteed that the battery poor in welding can be effectively detected through helium detection.

The utility model discloses a nailing machine relates to cosmetic powder box production technical field, including movable frame, and the movable frame is fixedly connected with the bottom plate, and the bottom plate is symmetrical with nailing mechanism and nail feeding mechanism on, and the nailing mechanism includes nail feeding platform, and the bottom plate is symmetrical installation pneumatic nailing gun, and has the nail feeding platform and installs the slide nail platform, and the slide nail platform is opened with the nailing groove, and the slide nail platform is slidably provided with the push nail board, and the push nail board inboard is placed with the pin, and the push nail board is used to move the pin to the nailing groove, and the nail feeding mechanism includes the vibration dish, and the nailing mechanism and nail feeding mechanism cooperate, realize automatic nailing, reduce manual operation, and the production speed is improved significantly. Meanwhile, through the nail feeding mechanism can flexible delivery plastic nail or metal nail, adapt to the nailing demand of different material pin, enhance the versatility and flexibility of production line.

The utility model relates to a pair of metal nail clippers with long service life, which comprises a clipper body and a clipper cover, the clipper body is hinged with the clipper cover, and a polishing component is arranged on the clipper body. The polishing assembly comprises a limiting bolt fixedly installed at the bottom of the clamp body, an elastic piece is movably arranged on the outer side of the limiting bolt, a rotating shaft is rotationally connected to the bottom of the elastic piece, and a file is fixedly connected to the outer side of the rotating shaft. According to the metal nail clipper with the long service cycle, through the arranged polishing assembly, a user can more conveniently conduct rough polishing and fine polishing on trimmed nails when using the nail clipper, the situation that a file can be rotated out of the nail clipper body after a clipper cover is opened at first is not needed, the user can conveniently use the nail clipper, and through the arrangement of an elastic piece, the nail clipper is convenient to use. And when the nail clippers are not used, the nail clippers can be hung on a pocket or a waistband of a user through the elastic piece, so that the nail clippers are convenient to carry and place by the user.

This invention provides a vertical tensioning device for the tail counterweight of a belt conveyor, including a floor slab. Guide rods are fixedly connected to both sides of the floor slab, a bracket is fixedly connected to one side of the guide rods, and a first mounting bracket is fixedly connected to one side of the bracket. The device is fixed to the plane by the guide rods and achieves stable anchoring using support pipes and metal nails. This effectively saves a large amount of horizontal space required by traditional tensioning trolleys and towers, and is particularly suitable for working conditions with limited tail space. The conveyor belt forms a loop through a first redirecting roller, a second redirecting roller, and a third redirecting roller, and automatically provides tension through its downward vertical sag. This tensioning method, which relies on the gravity of the sag section of the conveyor belt, can automatically compensate for the plastic elongation generated by the conveyor belt during operation, maintain constant and stable tension, effectively prevent drive slippage, and limit excessive sag. While simplifying the structure and reducing civil engineering costs, it ensures the efficient and stable operation of the belt conveyor.

The utility model provides a tire nail machine gun head rotating structure which comprises a first-stage bearing table and a second-stage bearing table, a rotating mechanism is arranged on the first-stage bearing table, the second-stage bearing table is arranged on a power output shaft of the rotating mechanism, and the second-stage bearing table is driven by the rotating mechanism to rotate relative to the first-stage bearing table. The stroke air cylinder is fixed to the second-stage bearing table, the nail pressing air cylinder slides on the second-stage bearing table, the nail pressing air cylinder acts on the tire nailing machine gun head, and the stroke air cylinder pushes the nail pressing air cylinder and the tire nailing machine gun head to be close to the surface of a tire. The first-stage bearing table provided by the utility model directly deflects the second-stage bearing table through the rotating mechanism, so that the stroke air cylinder and the nail pressing air cylinder can form a proper angle relation with the surface of a tire, the gun head equipment of the tire nailing machine is endowed with the adjusting capacity by utilizing the rotating mechanism, and a pressed metal nail is ensured to have a higher ground gripping effect; and multi-directional road holding force is provided.

This utility model discloses a railing device, relating to the field of railing technology. The device includes a post, a crossbar, and a wooden wedge-shaped locking strip. The post has a rectangular groove on its side; the crossbar has an insertion part at its end, with a wedge-shaped groove at its top; the locking strip has a right-angled trapezoidal cross-section and achieves mechanical self-locking by inserting its inclined surface downwards into the wedge-shaped groove. When the locking strip is inserted, its inclined surface presses against the inner wall of the wedge-shaped groove, forcing the insertion part to expand inwards and press against the inner wall of the rectangular groove, forming a horizontal compressive force; simultaneously, the top of the locking strip presses against the upper edge of the rectangular groove, resisting vertical pull-out force. This device uses an all-wood structure, eliminating the risk of corrosion from metal nails and extending its service life; at the same time, the wedge-shaped self-locking structure provides strong resistance to pull-out and impact, preventing loosening, and is suitable for outdoor scenarios such as parks and boardwalks.

Auxiliary cable guiding equipment is characterized in that the auxiliary cable guiding equipment comprises a mounting base, a mounting frame, a cable drum, a guide wheel support, a guide wheel, a metal nail and a proximity switch, the mounting base is fixedly connected to a paper conveying trolley through bolts, the mounting frame is fixedly connected to the mounting base, the cable drum is mounted on the mounting frame, a power cable is wound around the cable drum, and the proximity switch is connected to the power cable. The power cable is laid on a guide wheel located on the front side of the cable drum, a plurality of metal nails are arranged on the outer edge of a side plate on one side of the guide wheel at intervals, the guide wheel is installed on a guide wheel support, the guide wheel support is arranged on an installation base, a proximity switch is installed on an installation plate arranged on the guide wheel support, and the proximity switch is connected with the installation base. The power cable is prevented from being pulled and broken, and personnel electric shock or equipment damage is avoided.

The application provides a millimeter wave multilayer gap waveguide duplexer and a design method thereof, the duplexer comprising two low-frequency bandpass filters, one high-frequency bandpass filter and two hybrid couplers; each part component is designed by using a periodic gap waveguide transmission line with a multilayer structure; the periodic gap waveguide transmission line with the multilayer structure is a double-layer gap waveguide transmission line structure in a back-to-back form, the transmission line has a three-layer structure, comprising upper and lower cover plate layers and a middle metal nail plate layer, the metal nail plate is attached with periodic square long columns, and the periodic square long columns are distributed on both sides of the metal nail plate. The duplexer can increase assembly error and reduce the overall size of the device to a certain extent.

To improve the convenience of magazines and work implements. [Solution] A magazine 12 is attached to a work machine having an ejection unit that supports nails 3 and a striking unit that strikes the nails 3 supported by the ejection unit, and supplies nails 3 to the ejection unit. The magazine 12 is elongated in shape and made of resin, and has a first magazine cover 43 that defines a nail storage chamber 43a, and a metal nail plate 44 that is integrally formed with the first magazine cover 43 so as to face the storage chamber 43a and guides the movement of nails 3 within the storage chamber 43a.

A push broom with special features to aid in removal of roofing shingles has a metal nail removal tool which is provided on the broom head that functions much like a claw hammer. A user may slide the tool under a nail head and then lifts up on the handle from a standing position to remove the nail. Secondly, the forward-facing edge of the broom body is lined with magnets. This feature allows for easy pickup of nails, staples, and metal debris from grass, pavement and other areas without having to bend over to pick them up, while ensuring that all metal objects are removed.

The utility model discloses a metal nail burr removing device which comprises a bottom plate, a side plate is fixedly connected to the top face of the bottom plate, a first fixing plate is fixedly connected to one side of the top of the side plate, a first air cylinder is fixedly installed on the bottom face of the first fixing plate, the output end of a piston rod of the first air cylinder is fixedly connected with one end of a first connecting rod, and a pressing plate is fixedly installed at the other end of the first connecting rod. A notch is formed in the bottom face of the pressing plate, and a rubber pad is fixedly arranged in the notch. By arranging the first air cylinder, the first connecting rod, the pressing plate, the rubber pad and the like, placed metal nails can be pressed and fixed, and by arranging the second air cylinder, the second connecting rod, the lifting block, the motor, the rotating rod, the connecting plate, the polishing barrel, the polishing brush and the like, the polishing barrel can be lifted and rotated through matched use of the second air cylinder and the motor; and by arranging a positioning rod, a positioning hole, a limiting nut and the like, the grinding barrel is convenient to disassemble, and grinding scraps of the metal nails in the grinding barrel are convenient to clean.

The metal curtain wall system comprises fixed square steel installed on the top of a house, a profiled steel sheet is fixedly installed on the fixed square steel, and a glass wool sound insulation layer and a foam glass heat preservation plate are sequentially arranged on the surface of the profiled steel sheet. A metal nail plate is installed on the upper surface of the foam glass heat preservation plate, an asphalt waterproof coiled material is arranged on the surface of the metal nail plate, elastic adjusting supports are installed on the metal nail plate, a square steel framework system is erected between the adjusting supports, and a decoration plate is laid on the square steel framework system. The multiple waterproof layers are arranged on the roof, so that the waterproof effect during roof transformation is greatly improved, and roof water leakage is avoided; meanwhile, the square steel framework system is fixed through the metal nail disc and the adjusting support, the metal curtain wall formed by the metal decorative plates has certain deformation capacity through the elasticity of the buffer springs, and therefore the metal curtain wall is not prone to being smashed due to the large impact force.

The application relates to a metal nail sharpening device and relates to the field of metal nail processing devices to solve the problem of low efficiency of the metal nail sharpening process. The device comprises a base, a polishing mechanism, a conveying mechanism, a supporting plate and a pressing plate. The base comprises a bottom plate, two end plates vertically fixed on the bottom plate and two side plates fixed on the end plates. The polishing mechanism comprises a polishing roller and a first motor. The polishing roller is rotationally connected to the end plate, and the first motor is used for driving the polishing roller to rotate. The conveying mechanism comprises two rotating rollers, a conveying belt and a second motor. The rotating rollers are rotationally connected to the side plates, the conveying belt is arranged on the rotating rollers, and the second motor is used for driving the rotating rollers to rotate. The supporting plate is fixedly installed on the end plate and is parallel to the polishing roller and is used for bearing the metal nail. The pressing plate is fixedly installed on the side plate and is attached to the inner side surface of the conveying belt. The efficiency of the metal nail sharpening process can be effectively improved.

The present application relates to the technical field of metal nail turning, and discloses a metal nail turning equipment with automatic material ejection, which comprises a lathe, a fixed seat is fixedly installed on the lathe, a motor is fixedly installed on the fixed seat, a sleeve is fixedly installed at the output end of the motor, a first air cylinder is fixedly installed on the inner wall of the sleeve, a plurality of fixed blocks are fixedly installed at the output end of the first air cylinder, a clamping block for clamping a metal nail is slidingly installed between every two adjacent fixed blocks, the turning equipment detects the vibration during the turning process by means of the stepped groove and the vibration detection ball, when the hardness of the metal nail raw material is high, the vibration of the fixed seat increases, the vibration detection ball is separated from the top end of the stepped groove, and falls into the corresponding stepped groove at different levels according to the vibration amplitude, and pulls the pull rod and the end adjusting knob, so that the power seat drives the tool holder to move at a lower speed, the turning speed is slowed down, the cooling device sprays more cooling liquid, and the cooling effect is improved.

A stud isolator with integrated nail protection and sound abatement, providing isolation, nail protection and sound abatement in a single device, with installation of a single product. Such an isolator includes an insertion body sized and configured for insertion into the stud bore hole. The insertion body includes a faceplate attached to the front end of the insertion body, so as to serve as a stop and attachment point to the stud, when the insertion body is inserted into the stud bore hole. The insertion body includes a hollow channel for receipt of a plumbing pipe extending through the stud bore hole. In addition, a metal nail protection collar and sound abatement layer are provided received in the insertion body of the isolator, so as to surround the plumbing pipe received in the isolator.

The invention discloses a heat preservation nail for a steel bar net rack heat preservation plate, a connecting structure and an application method, and belongs to the technical field of heat preservation nails.The heat preservation nail comprises a round cap and a mounting rod, the mounting rod is connected to the middle of the round cap, and a mounting hole is formed in the other side of the mounting rod; the mounting hole in the other side of the mounting rod is a threaded hole or an unthreaded self-tapping hole, and the round cap and the mounting rod are made of non-metal materials. The heat preservation nails and the connecting structure for the steel bar net rack heat preservation plate without the cold and hot bridges are used, non-metal materials are used, heat transfer of the composite heat preservation plate through traditional metal nails can be greatly prevented, and the heat preservation effect of the composite heat preservation plate is improved.

The utility model discloses a portable ceramic mug with internal threads, which belongs to the technical field of cups and comprises a main mug body, a folding handle is arranged on the outer side of the main mug body, a mug cover is in threaded connection with the top of the main mug body, a center piece used for fixing a filtering structure and a water retaining piece is arranged at the top of the mug cover, and the filtering structure is inserted into the center piece through threads. The water retaining piece is hinged to the center piece and fixed to one side of the cup cover. Therefore, according to the portable ceramic mug with the internal threads, the two parallel handle fixing pieces are fixedly arranged on the periphery of the main mug body through the metal nails, the two folding handles penetrate through the corresponding connecting lugs on the two handle fixing pieces, and the portable ceramic mug is convenient to use and carry.

The utility model discloses a cutting die structure for processing a seat foam inner reinforcing block, and relates to the technical field of automobile seats, the cutting die structure comprises an upper die and a lower die matched with the upper die, the upper die comprises an upper die plate, a punching blade arranged on the upper die plate and a magnetic attraction part used for attracting a metal nail, the magnetic attraction part is higher than the bottom surface of the upper die plate, and the lower die is arranged on the lower die plate. The lower die comprises a lower die plate and a supporting column arranged on the lower die plate, the supporting column is matched with the magnetic attraction part, the supporting column is arranged to be higher than the top face of the lower die plate, and a metal nail compression space is formed between the supporting column and the magnetic attraction part after the upper die and the lower die are assembled. The sum of the height of the magnetic attraction part, the height of the supporting column and the height of the metal nail compression space is equal to the thickness of the reinforcing block. According to the cutting die structure for machining the reinforcing block in the seat foam, the structure is simple, the magnetic attraction part is arranged in the cutting die, the metal nails are installed in an embedded mode while the reinforcing block is punched, procedures are saved, and manufacturing working hours are saved.

The utility model discloses a heavy packing box for an engine, which belongs to the field of engine packing and comprises a packing component and a limiting component, the packing component comprises a box body, a bottom plate is clamped at the lower end of the box body, a top cover is clamped at the upper end of the box body, a plurality of pressing blocks are fixedly connected at the lower end of the top cover, and a bottom support is connected at the lower end of the bottom plate. A cross plate is fixedly connected to the lower end of the bottom plate, a cross groove is formed in the upper end of the bottom support, the cross plate is clamped in the cross groove, a bracket is fixedly connected to the lower end of the bottom support, and a plurality of stabilizing blocks are fixedly connected to the lower end of the bracket; according to the engine packaging box, the packaging assembly is matched with the limiting assembly, the engine packaging box can be attached to the periphery and the bottom of an engine, so that the multiple limiting protection effect is achieved, the engine is prevented from shaking, metal nails are avoided, the weight is reduced, and the practicability of the packaging box is enhanced; and meanwhile, through mutual cooperation of the structures, the packaging box can be disassembled and assembled conveniently, and disassembling, assembling and replacing convenience is improved.

The utility model discloses a clamping device for metal nail processing, which comprises a conveying channel, a supporting ring is arranged at the tail end of the conveying channel, a plurality of clamping components are arranged on the supporting ring, the clamping components are circumferentially and uniformly distributed, one end of the supporting ring is rotatably sleeved with a supporting disc, and one end face of the supporting disc is coaxially and fixedly connected with one end of a fixing shaft. The bottom of one end face of the supporting ring is in transmission connection with one side of a transmission shaft through a gear set in meshed connection, the transmission shaft is rotationally connected with the bottom of a supporting disc in a sleeved mode, the transmission shaft is sleeved with a pressing disc, the pressing disc is rotationally arranged in the supporting ring, and a fixing disc is installed at the end of the other side of the transmission shaft. A sharpened and cut-off metal nail is limited and fixed through the clamping assembly, the accuracy of the clamping position is guaranteed through the two symmetrically-arranged clamping plates, the metal nail is prevented from slipping, the nail cap of the metal nail is pressed through cooperation of the pressing disc, and the machining efficiency of the metal nail is improved.

The application discloses a skull repair fixing method, which comprises a drilling fixing part and a connecting part; the drilling fixing part comprises a drilling expansion fixing part; the drilling expansion fixing part is annular with an opening; the center position of the drilling expansion fixing part is a conical screw hole; two sides of the opening of the drilling expansion fixing part are respectively provided with bone flap fixing parts; after the drilling expansion fixing part is placed into a drilling hole on a skull, a screw is screwed into the conical screw hole, and the drilling expansion fixing part is clamped in the drilling hole after expansion; the two ends of the connecting part are respectively provided with a clamping groove for clamping a bone flap and a clamping groove for clamping a skull. The skull repair fixing method is simple in operation, does not need metal nail fixing, and has no additional protruding part on the skull, so that the mental state of a patient after operation is better.