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87 results about "Body space" patented technology

Water tank

A water tank is disclosed. According to one aspect of the present disclosure, a water tank may include: a tank body having a tank body space formed therein; a tank cover configured to cover the tank body space and be coupled to the tank body; a reinforcing member that is at least partially accommodated in the tank body space and is respectively coupled to the tank body and the tank cover to reinforce rigidity of the tank body or the tank cover; and a fastening part configured to couple the reinforcing member and the tank cover.
Owner:COWAY CO LTD

Extensible functional cabin

The utility model relates to an extensible function cabin which comprises a main cabin structure, a main body space is formed in the main cabin structure, and an installation opening is formed in the side portion of the main cabin structure. The telescopic cabin body is arranged at the mounting opening and located in the main body space, the size of the telescopic cabin body is matched with the size of the mounting opening, and the telescopic cabin body can move out of the mounting opening to the outer side of the main cabin structure and extend to form an extension space. According to the extensible functional cabin, the telescopic cabin body can be moved to the outer side of the main cabin structure during use, the internal space of the main cabin structure is prevented from being occupied, and the problem that the occupied space affects use of the space of the main cabin is solved. Besides, the space expansion of the telescopic cabin body is realized by adopting a telescopic function, the size ratio of the unfolded state to the folded state can be 4: 1 to 10: 1, and compared with an expansion space formed by outwards unfolding a hinged linkage plate, the telescopic cabin body has the advantages of large expansion space and small size after folding, and can meet the requirements of people on space use.
Owner:SHANGHAI YUYI TECHNOLOGY CO LTD

Center column assembly for nuclear fusion device

The invention relates to the technical field of nuclear fusion device installation, and discloses a central column assembly for a nuclear fusion device, and the central column assembly comprises a main body part which is internally provided with a main body space; the Dewar base is located at the bottom of the main body space; the central column bottom plate is positioned at the bottom of the Dewar base and is connected with the main body part in a leveling manner; the bottom of the central column main body is fixedly connected with the central column bottom plate, a rotatable rotating part is formed at the top of the central column main body, and the central column main body is detachably connected with the Dewar base; wherein the central column main body is constructed into at least two sections of split columns in the axial direction, and at least two adjacent sections of split columns are detachably matched with each other. The central column assembly for the nuclear fusion device is higher in precision, richer in adjusting function and good in structural reliability.
Owner:聚变新能(安徽)有限公司

Water tank

A water tank is disclosed. According to one aspect of the present disclosure, a water tank includes a tank body having a tank body space formed therein; a tank cover configured to cover the tank body space and be coupled with the tank body; and a tank cover reinforcing part formed on the tank cover to reinforce rigidity of the tank cover, wherein the tank cover includes a tank cover surface formed to be rounded so as to be convex in a direction opposite to the tank body space, and the tank cover reinforcing part can be formed to protrude on the tank cover surface.
Owner:COWAY CO LTD

Double-valve-body softening valve with roller structure

The double-valve-body softening valve with the roller structure comprises a first valve body and a second valve body, the first valve body is provided with a water inlet, a first water outlet and a salt suction opening, the second valve body is provided with a water outlet and a second water outlet, a first roller is rotationally arranged in a first valve cavity in a sleeved mode through a first driving device, and a second roller is arranged in a second valve cavity in a sleeved mode through a second driving device. A second roller is rotationally sleeved with the second valve cavity through a second driving device, and the first roller and the second roller are controlled to rotate anticlockwise through the first driving device and the second driving device correspondingly, so that butt-joint openings in the rollers communicate with through holes in the valve body inner barrel correspondingly. Therefore, the passage between different chambers and the water outlet, the water outlet or the salt suction port is realized, so that the functions of normal operation, backwashing, regeneration, conventional washing or water replenishing of the softening valve are realized. The internal structure of the valve body is simple, the waterway switching logic is convenient, and the space in the valve body is utilized to the maximum extent, so that the water passing area and flux are remarkably improved, and the water treatment efficiency is greatly improved.
Owner:ZHENGZHOU KANGRUN FLUID EQUIP CO LTD

Electric compressor and water heating heater integrated mechanism for new energy vehicle

The utility model relates to an electric compressor and water heating heater integrated mechanism for a new energy vehicle, which relates to the technical field of automobile part production, and comprises an electric scroll compressor body and a water heating electric heating assembly, and the electric scroll compressor body and the water heating electric heating assembly are respectively and fixedly arranged on a two-in-one controller. According to the electric scroll compressor, the electric scroll compressor body, the water heating electric heating assembly and the two-in-one controller are integrated into the same structure, a traditional split type installation mode is broken through, redundant space occupation among components is reduced, compact layout is achieved, meanwhile, through double-face installation and a base limiting structure, three-dimensional compact layout is further achieved, and the electric scroll compressor is more compact in structure. The limited vehicle body space requirement of the new energy vehicle is met; and the shell, the connector and other components are shared, the overall size is reduced by about 30%-40% compared with a split type scheme, and a layout space is vacated for a battery pack or other key components.
Owner:ANHUI DYNE AUTO AIR CONDITIONER LTD

cleaner

A cleaner may include an intake portion configured to draw in debris from a surface to be cleaned, and a drum that is rotatable while arranged in the intake portion, and including: a body including: a first end along a rotational axis of the drum, the first end having a first end outer diameter and including: a body connecting portion, and a body spaced portion spaced from the body connecting portion along the rotational axis, and a second end along the rotational axis opposite the first end and having a second end outer diameter that is larger than the first end outer diameter, and a connecting body couplable to the first end of the body, and including a connecting portion connectable to the body spaced portion, wherein with the connecting body coupled to the first end of the body, the connecting portion is connected to the body spaced portion.
Owner:SAMSUNG ELECTRONICS CO LTD

Elastic piece, keyboard, electronic equipment and keyboard sleeve

The invention relates to the technical field of keyboards, in particular to an elastic piece, a keyboard, electronic equipment and a keyboard sleeve. An elastic piece is applied to a keyboard and comprises a first part, a second part, a third part and a trigger part. The second part is connected between the first part and the third part, a cover body space is defined by the first part, the second part and the third part, and the trigger part is located in the cover body space; the first part comprises a main body part and a forming part, the main body part is connected with the second part, the forming part is connected with the trigger part, the forming part is located on the side, away from the cover body space, of the trigger part, a buffer space is defined by the forming part and the trigger part, and in the first direction, the projection of the forming part at least partially covers the projection of the buffer space; the first direction is the arrangement direction of the first part and the second part. In the deformation process of the elastic piece, the elastic force change of the deformation of the elastic piece is smooth, and the sudden change of the elastic force is reduced. When the elastic piece is applied to the keyboard, fingers of a user are not prone to fatigue, and use is easy.
Owner:HUAWEI TECH CO LTD

Quartz under dome product processing jig and processing method

The application relates to a quartz lower DOME product processing jig which comprises three graphite jigs, the lower part of the side of each graphite jig is formed with a spherical surface groove, the middle part is formed with an arc surface groove, and the top part is formed with a flange groove; the arc surface groove is connected with the spherical surface groove; the spherical surface grooves of the three graphite jigs enclose a ball head space for accommodating a ball head; the arc surface grooves of the three graphite jigs enclose a pipe body space for accommodating a pipe body; and the flange grooves of the three graphite jigs enclose a flange space for accommodating a flange; the ball head space, the pipe body space and the flange space are coaxially distributed. The processing jig provided by the application encloses the coaxially distributed ball head space, the pipe body space and the flange space by the three graphite jigs, is used for sequentially attaching the ball head, the pipe body and the flange, and can jointly guarantee the coaxiality of the flange, the pipe body and the ball head and the runout of the ball head; meanwhile, the three graphite jigs are designed by using the self-centering principle of three-jaw chucks, and do not need to fix and adjust parts for many times.
Owner:ZHEJIANG FULEDE QUARTZ TECH CO LTD

Portable data acquisition device developed based on Arduino

A portable data acquisition device developed based on Arduino comprises a mainboard module, a shell, a ventilation plate and a sensor module, the mainboard module, the shell and the ventilation plate are connected to form a main body space, the sensor module is assembled on the shell, the sensor module is partially exposed in an external space of the main body space, and the mainboard module is electrically connected with the sensor module. According to the portable data acquisition device developed based on Arduino, detection of a plurality of environmental indexes can be completed, and the sensors are integrated together, so that the portable data acquisition device is convenient to carry, and the defect that space is occupied due to independent installation is avoided.
Owner:TONGJI UNIV

Medical non-woven fabric production disinfection equipment

The invention belongs to the technical field of disinfection equipment, and particularly relates to medical non-woven fabric production disinfection equipment which comprises a cabinet. A feeding port is formed in one side of the cabinet body, and a discharging port is formed in the other side of the cabinet body. The interior of the cabinet body is detachably connected with a plurality of supporting shafts through bolts. The end part of the supporting shaft extends to the outer side wall of the cabinet body; the middle of the supporting shaft is rotationally connected with a roller with holes. Wherein a bearing is arranged between the roller with the hole and the supporting shaft; the side wall, located outside the cabinet body, of the supporting shaft is communicated with an air adding connector. Through a plurality of rollers with holes which are distributed up and down and matched with flow deflectors capable of flexibly controlling the spraying direction, multiple times of efficient penetrating contact between gas and non-woven fabric in a limited cabinet body space is achieved, and therefore the length of a traditional long-distance high-temperature channel needed for achieving sufficient soaking and contact is reduced, and the service life of the non-woven fabric is prolonged. The utilization rate of disinfection gas is improved; and the overall space occupation of equipment is reduced.
Owner:YANGZHOU AOTELONG NONWOVENS CO LTD

Intelligent optimization of culture space mushroom cabin

The application discloses a kind of intelligent optimization cultivation space's fungus mushroom cabin, including cabin section head, folding cabin section body and mobile mechanism, the folding cabin section body is placed between cabin section head and cabin section tail, by increasing or reducing the number of folding cabin section body, flexible combination and adjustment are carried out, to respond to planting demand realizes the expansion or reduction of fungus mushroom cabin cabin body space, the mobile mechanism is symmetrically arranged in the cavity of folding cabin section body, and it is used for the position control of three-dimensional cultivation frame, controls out planting personnel passageway, maximum degree reasonable use fungus mushroom cabin cabin space.The intelligent optimization cultivation space's fungus mushroom cabin, by combination type structure setting, can reasonably according to the number of fungus mushroom three-dimensional cultivation frame, realize the flexible adjustment and expansion of fungus mushroom cabin cultivation space, to adapt to different use requirements, in addition, carry out automatic sealing treatment while assembling and locking, keep the sealing effect of combination type fungus mushroom cabin connecting place.
Owner:KANGSHUAI SHANGHAI COLD CHAIN TECHNOLOGY CORP LTD

Support assembly and unmanned vehicle

The utility model belongs to the technical field of unmanned vehicles, and discloses a support assembly and an unmanned vehicle. The support assembly is used for installing a plurality of different sensors. The support assembly comprises an installation shell, a connecting frame and an installation frame, the installation shell is installed on the vehicle body, the connecting frame is installed on the installation shell, the installation frame is installed on the connecting frame, and the multiple different sensors are installed at different positions of the installation frame respectively. A plurality of different sensors are mounted at different positions of the mounting frame respectively, the bracket assembly can be mounted on the vehicle body through the mounting shell, the sensors can be mounted in advance and mounted on the bracket assembly, the sensors do not need to be mounted through a plurality of mounting brackets in the vehicle body space, the operation space is large, and the mounting efficiency is improved. The installation difficulty is reduced, the installation efficiency is improved, the support assembly can be directly installed on the vehicle body, and operation is convenient and fast.
Owner:SHANGHAI ECAR TECHNOLOGY CO LTD

Machining equipment

The utility model provides processing equipment which comprises a lathe bed, a stand column, workbenches and spindle boxes, two independent working areas, namely a first lathe body space and a second lathe body space, are formed on the lathe bed, and each space is provided with at least two movable workbenches, at least two movable spindle boxes and spindles matched with the workbenches and the spindle boxes in a one-to-one mode. The machining equipment is further provided with a first tool magazine and a second tool magazine which are respectively used for providing tools for the main shafts. By means of the design, the working efficiency and flexibility of the machining equipment are greatly improved, different cutters can be rapidly replaced and the position of the workbench can be rapidly adjusted when different parts are machined, the diversity and adaptability of machining are effectively improved, and meanwhile operation independence of each working area and reasonable utilization of space are guaranteed.
Owner:SHENZHEN HUALING INTELLIGENT EQUIP CO LTD

Multi-boat launching and recovering device and method and boat

PendingCN121180372ACargo handling apparatusLifeboat handlingTransfer mechanismHull
The invention belongs to the technical field of ships, and discloses a multi-boat launching and recycling device and method and a ship. The multi-boat launching and recovering device comprises a stern slide way retracting and releasing mechanism, a parking mechanism and a transferring mechanism, the stern slide way retracting and releasing mechanism, the parking mechanism and the transferring mechanism can park shipborne boats, at least the stern slide way retracting and releasing mechanism and the parking mechanism can park the shipborne boats in rows, parallel loading of the multiple shipborne boats is achieved, and the deck space on a boat body is fully utilized. According to the multi-boat launching and recovering method, the shipborne boats loaded on the stern chute launching and recovering mechanism, the transferring mechanism and the parking mechanism can be launched in sequence, and a launching or recovering scheme can be flexibly planned according to the current loading condition of the shipborne boats on the boat body. According to the ship, the ship body space can be fully utilized, and shipborne boats can be flexibly loaded and laid.
Owner:RES INST 708 OF CHINA STATE SHIPBUILDING CORP

Synchronous control method, system and device for dual-domain controller and medium

The invention provides a double-domain controller synchronous control method, system and device and a medium, and belongs to the technical field of vehicles. The method comprises the following steps: driving a master domain controller to output a synchronization instruction to a slave domain controller; wherein a phase-locked loop module is arranged in the slave domain controller. And when it is confirmed that the slave domain controller receives the synchronization instruction, performing synchronization adjustment through the phase-locked loop module according to the synchronization instruction. And when it is confirmed that the slave domain controller and the master domain controller are successfully synchronized, adjusting an offset signal output by the slave domain controller to the master domain controller. And adjusting the synchronization instruction according to the offset signal, determining a driving period according to the offset signal and the adjusted synchronization instruction, and driving the master domain controller and the slave domain controller to perform regulation and control operation on the corresponding actuator in the driving period. The synchronous control efficiency is improved, and the vehicle body space is saved.
Owner:CHINA FAW CO LTD

Windshield crossbeam assembly and automobile

The application provides a windshield crossbeam assembly and a car. The windshield crossbeam assembly comprises a first crossbeam and a second crossbeam. The first crossbeam is provided with an opening extending along a first direction. The opening direction of the opening is perpendicular to the first direction. The second crossbeam is connected with the first crossbeam and is located below the opening. The second crossbeam forms a closed cavity below the opening. The car provided by the application comprises a car body and the windshield crossbeam assembly. The windshield crossbeam assembly is installed at the car head of the car body. The first direction is the width direction of the car body. The closed cavity formed by the second crossbeam is located below the opening of the first crossbeam, so that the car body space can be optimized. The first crossbeam with the opening structure can reduce the injury value of the head collision of pedestrians and meet the requirements of pedestrian protection. The closed cavity of the second crossbeam can meet the torsional stiffness of the whole car and the requirements of the car body NVH.
Owner:ZHEJIANG ZEEKR INTELLIGENT TECH CO LTD +1

A general measuring device and method for body posture and longitudinal axis direction in free state

ActiveCN116734798BBody postureMachine
A kind of free state body posture and longitudinal axis direction general measuring equipment and method, including first longitudinal axis marker pole and second longitudinal axis marker pole, wherein first longitudinal axis marker pole includes vertically arranged first main branch rod.The positive effect of the present application is that the present application is not affected by the influence of the machine belly shelter, and the universality is strong, and the weapon system calibration of the warplane can be created at any time in the field environment, the longitudinal axis of the machine body is measured in the free state of the machine body, compared with the previous old method, the universality is stronger, and the previous method can be used on a few machine models, and the present method can be used on all machine models.The method of the present application requires less operators, saves manpower compared with the old method, and the body posture determination process can be completed by a single person independently, and through on-site use demonstration, the measurement of the body space posture can be completed by a single person in 2-5 minutes after being skilled.
Owner:中国人民解放军71901部队保障部

Waterproof grid-connected cabinet shell

The utility model discloses a waterproof grid-connected cabinet shell, and belongs to the technical field of grid-connected cabinet production. The waterproof grid-connected cabinet shell comprises a grid-connected cabinet outer shell, a sealing door is arranged in front of the grid-connected cabinet outer shell, a connecting strip is hinged to one side of the sealing door, a sealing groove is formed in the front end face of the grid-connected cabinet outer shell, silica gel strips are fixedly connected to the rear end face of the sealing door and the rear end face of the connecting strip, and the silica gel strips are located in the sealing groove. By pulling the sealing door, the sealing door moves the moving frame, the moving frame, the extension block, the moving rod and the mounting frame to move synchronously, the moving rod and the mounting frame can move to the outside from the inside of the grid-connected cabinet shell, a worker can conveniently carry out mounting operation in a spacious external space, inconvenience of operation in a narrow cabinet body space is avoided, and the mounting efficiency is greatly improved. And during later maintenance, the mounting frame can be conveniently pulled out for maintenance, so that the maintenance difficulty is reduced, the maintenance time is shortened, and the maintenance convenience and operability of the whole grid-connected cabinet are improved.
Owner:ANHUI FEISHIQI TECHNOLOGY CO LTD

Sealed fruit and vegetable box for refrigerator

The utility model discloses a sealed fruit and vegetable box for a refrigerator, which comprises a main body unit comprising a box body and a box cover matched with the box body, the bottom end of the box body is fixedly provided with a base, and the top end of the box cover is provided with a handle; when the space of the box body is adjusted, the pull rod is pulled to enable the connecting plate to move upwards along the guide rod and compress the spring, the guide structure ensures stable movement, the connecting plate ascends to drive the clamping block to be separated from the clamping groove, the isolation plate is allowed to rotate to be vertical, and the space of the box body is adjusted. After the pull rod is released, the spring rebounds to push the connecting plate to descend, the clamping block enters the limiting groove of the base to fix the isolation plate, the space of the box body is separated through the design, and the problems that the space is not flexible, fruits are difficult to place in a classified mode, object taking difficulty and time are increased, and efficiency is reduced due to the fact that a refrigerator sealing fruit and vegetable box is usually integrally formed due to sealing requirements are solved.
Owner:JIANGSU ZHONGKE RUITENG GLASS TECH CO LTD

Central column assembly for a nuclear fusion device

The application relates to the technical field of nuclear fusion device installation, and discloses a center column assembly for a nuclear fusion device, which comprises a main body part, a Dewar base, a center column bottom plate and a center column main body; the inside of the main body part is formed with a main body space; the Dewar base is located at the bottom of the main body space; the center column bottom plate is located at the bottom of the Dewar base and is connected with the main body part in a leveling mode; the bottom of the center column main body is fixedly connected with the center column bottom plate, and the top of the center column main body is formed with a rotatable rotating part; the center column main body is detachably connected with the Dewar base; wherein the center column main body is constructed as at least two sectional columns in the axial direction, and at least two adjacent sectional columns are detachably matched. The center column assembly for the nuclear fusion device designed according to the application has higher precision, richer adjustment functions and good structural reliability.
Owner:聚变新能(安徽)有限公司

Structural component and electronic equipment

The utility model provides a structural assembly and electronic equipment. The structural assembly comprises a first structural member, a second structural member and a colloid. The first structural part comprises a first bonding surface, the second structural part comprises a second bonding surface, and a first gap is formed between the first bonding surface and the second bonding surface. The first bonding face is provided with a first groove structure, the second bonding face is provided with a second groove structure, and a first groove body space defined by the first groove structure and a second groove body space defined by the second groove structure are communicated with the first gap to form a glue containing space. A first groove body space defined by the first groove structure and a second groove body space defined by the second groove structure are respectively communicated with the first gap to form a glue accommodating space. The glue containing space is filled with the glue, and a glue structure is formed in the first gap and the groove body space extending from the first gap to the two sides, so that the glue receiving area and the direction of the bonding grasping force are increased, and the bonding reliability and the yield of the electronic equipment are improved.
Owner:BEIJING XIAOMI MOBILE SOFTWARE CO LTD

Bottom rotating type paste bottle

The utility model discloses a bottom rotating type paste bottle. The bottom rotating type paste bottle comprises a bottle body unit, an assembling unit, a driving unit, a lifting unit and a positioning unit. The bottle body unit comprises a bottle body and a column body which extends downwards from the bottom of the bottle body, the assembling unit is located below the bottle body, the column body extends into an assembling through hole of the assembling unit, the driving unit comprises a driving seat and a driving column which extends downwards from the driving seat, the driving seat is fixedly installed on the assembling unit, and the driving column extends downwards from the driving seat. The driving column extends into a column body penetrating hole of the column body, the lifting unit comprises a lifting seat and a driven rod extending downwards from the bottom of the lifting seat, the lifting seat is contained in a bottle body space of the bottle body in a lifting mode, the driven rod extends into a driving hole of the driving column, the driven rod and the driving column are installed in a screwed mode, and the positioning unit comprises a positioning part and a positioning groove. The positioning part is arranged on the column body, the positioning groove is formed in the position far away from the assembling end, and the positioning part can enter or exit from the positioning groove.
Owner:YUYAO SUN RAIN SPRAYER

High-voltage cabinet box body

The utility model discloses a high-voltage cabinet box body, the high-voltage cabinet box body comprises a main cabinet body, an auxiliary cabinet body and a cover body, two sides of the main cabinet body are provided with connecting units capable of connecting the auxiliary cabinet body or the cover body, each connecting unit comprises at least one rectangular frame, and the back of the auxiliary cabinet body is provided with a first U-shaped frame capable of being inserted into the rectangular frame from top to bottom. A second U-shaped frame capable of being inserted into the rectangular frame from top to bottom is arranged on the back face of the cover body, the rectangular frame is connected with the first U-shaped frame and the second U-shaped frame through bolts, a first wire passing hole is formed in the position, located in the rectangular frame, of the side face of the main cabinet body, and heat dissipation holes are formed in the bottom face of the rectangular frame. The high-voltage cabinet box body has a better space expansion function, and the problem of insufficient space of the main cabinet body is solved.
Owner:XUANCHENG RUIBO ELECTRIC CO LTD

Discectomy tool

A discectomy device for clearing material out of a disc space of a patient having a body, a first rotatable member at the distal portion of the body, and a second rotatable member at the distal portion of the body spaced from the first rotatable member. A transverse axis passes through the first and second rotatable members. A first mechanism is actuable to rotate the first and second rotatable members about the transverse axis. A mechanism can be provided to expand the rotatable members to increase the distance between the rotatable members. The rotatable members in some versions can be detached from the device for placement within the disc space.
Owner:COMBINATION SPINE INC

Metal mask and method for mounting component

To provide a metal mask and a mounting method of a mounting component capable of suppressing deterioration in bonding strength of an electrode of the mounting component to a pad while suppressing occurrence of a failure due to solder paste protruding from the pad.SOLUTION: In the mask body 4 of the metal mask, a plurality of openings 41 are formed corresponding to the plurality of pads 22 fixed to the mounting surface 21 of the substrate 2. The mask body 4 limits the region in which the solder paste 5 is printed on the mounting surface 21 and the pads 22 to the region of the openings 41. The area of each opening 41 is greater than or equal to the area of the corresponding pad 22. When the mask body 4 is placed in the masking position, the position of each opening 41 is shifted outward from the corresponding pad 22 with respect to the body space. A part of the pad 22 becomes a pad margin 22a deviated from a range where the opening 41 overlaps.SELECTED DRAWING: Figure 6
Owner:MITSUBISHI ELECTRIC CORP

Cooling type heat retention property testing device and method based on dynamic heat balance principle

The invention belongs to the technical field of textile performance testing, and discloses a cooling type heat retention property testing device and method based on a dynamic heat balance principle. Comprising a box body assembly, a heating system arranged above the box body assembly, a temperature measuring system penetrating through the side wall of the box body assembly and extending into the box body assembly, a reflective heat insulation system laid in the box body assembly and a sample fixing system. The temperature measuring system comprises a temperature measuring probe and a thermocouple tester, one end of the temperature measuring probe penetrates through the side wall of the box body assembly, the other end of the temperature measuring probe is connected with the thermocouple tester, an opening is formed in the center of the top of the box body assembly, and the sample fixing system is arranged at the opening of the top of the box body assembly. The warmth retention property testing device designed by the invention is adaptive to a thick velvet bag test, breaks through the thickness limitation of traditional instruments such as YG606 and the like, can accommodate a velvet bag sample with the thickness of 2-15cm through the top opening design and enough box body space, and solves the technical problem that a thick velvet bag cannot be tested.
Owner:BOSIDENG DOWN WEAR LTD