635 results about "Screw fixation" patented technology

The utility model discloses a high-efficiency rotary type suspension ball filler with a good aeration effect, which comprises an upper hemisphere and a lower hemisphere, a first fixed chuck is arranged on the outer side surface of the upper hemisphere, and a second fixed chuck is arranged on the outer side surface of the lower hemisphere. The first fixing chuck and the second fixing chuck are fixedly connected through a hexagonal screw, the upper end surface of the first fixing chuck is fixedly connected with a blade structure through a screw, the upper end surface of the blade structure is coated with a first smooth coating structure, and the lower end surface of the blade structure is coated with a second smooth coating structure. And a streamline curved surface structure is arranged on the surface of the blade structure. According to the utility model, a plurality of blade structures are arranged outside the suspended ball filler structure, and the blades are subjected to multifunctional design protection, so that the rotating effect of the suspended ball filler is better during aeration, a biological layer on an internal sponge block can be conveniently and quickly dropped, and the suspended ball filler has the advantages of good degradation effect and high sewage purification efficiency.

The pole piece slitting equipment comprises an upper cutter set and a lower cutter set, at least one of the upper cutter set and the lower cutter set comprises a cutter rotary part, a cutter sleeve and a cutter, and the cutter is annularly arranged on the cutter sleeve; the periphery of the cutter screw comprises a thread area and a non-thread area adjacent to the thread area in the axial direction of the cutter screw. Threads are formed in the inner circumference of the cutter sleeve in the axial direction, the cutter sleeve is arranged on the outer circumference of the cutter screw in a sleeving mode, partial area of the inner circumference of the cutter sleeve is in clamping fit with the non-thread area of the cutter screw, and the remaining area of the inner circumference of the cutter sleeve is in thread fit with the thread area of the cutter screw; when the cutter rotates in a rotating state, the cutter sleeve can move in the axial direction of the threaded area so that the cutter leaning amount of the upper cutter set and the lower cutter set can be adjusted. According to the pole piece slitting equipment, the non-threaded area is in clamping fit with the cutter sleeve, the threaded area of the cutter is beneficial to driving the cutter sleeve to move in the rotating state of the cutter, screw fixing is not needed, manual screw dismounting is not needed, operation is easy, the cutter leaning amount can be reliably adjusted, and meanwhile production efficiency can be improved.

The invention provides a stranding machine for cable manufacturing, and relates to the technical field of cable manufacturing, the stranding machine comprises a pay-off module, a stranding module and a wire outgoing module, the pay-off module comprises a rack, a fixed plate is fixed on the rack, a driving motor is installed on one side of the fixed plate, a rotatable rotating plate is arranged on the other side of the fixed plate, and the driving motor is connected with the driving motor. And an output shaft of the driving motor is connected with a rotating plate, and a plurality of pay-off assemblies are arranged on the rotating plate. An elastic clamping structure of the lock rod and the inserting groove is used for replacing traditional screw fixation, during disassembly, only the position of the sliding plate needs to be adjusted, the push rod is matched with the sliding plate, the lock rod is driven to contract through the connecting rod, the wheel shaft automatically falls off under the gravity effect, reverse operation is carried out during installation, manual contact with the lock rod is not needed in the whole process, and rapid disassembly of the multiple winding rollers is achieved; the mode does not need tools, is convenient and fast, obviously shortens the shutdown time of the machine due to replacement of the winding roller, and ensures the working efficiency of the device.

The invention provides a perforated brick production mold, and belongs to the technical field of perforated brick processing. Comprising a U-shaped fixing plate, one end of the U-shaped fixing plate is inserted into the inner wall of the inserting groove, the other end of the U-shaped fixing plate is fixedly connected with a first fixing plate through a screw, a second fixing plate is fixedly connected to the outer portion of one side of the first fixing plate, and a first round hole groove is formed in the outer wall of the top of the first fixing plate; the end, away from the first fixing plate, of the second fixing plate is fixedly connected with a third fixing plate. By arranging the rotating assembly, the knocking column on the inner wall of the large hole column can be knocked during rotation, so that the large hole column drives the small hole column to shake, bubbles in a concrete mixture in the fixed mold are discharged through vibration generated by cooperation of the knocking column and the small hole column, and meanwhile collapse generated by bubble discharging at the top of the mixture is rolled to be flat.

The utility model discloses a prostate puncture ultrasonic probe fixing and adjusting device, which relates to the field of adjusting devices and comprises a probe rotating and fixing mechanism used for mounting an ultrasonic probe and a multi-axis fine adjustment mechanism connected with the probe rotating and fixing mechanism and used for adjusting the ultrasonic probe. The multi-axis fine adjustment mechanism comprises an axial adjustment assembly, a ball head adjustment assembly and a fixing mechanism installation assembly, and the axial adjustment assembly comprises a Z-axis adjustment component and an X-axis and Y-axis adjustment component installed on the Z-axis adjustment component. By arranging the multi-axis fine adjustment mechanism and the probe rotating and fixing mechanism, the existing structure is optimized, the probe rotating and fixing mechanism uses a probe locking nut to firmly press a probe and the probe rotating and fixing mechanism together, and the problems that in original installation, a screw needs to be screwed manually for fixation, and the loosening risk exists are solved. And the part without sharp protrusion does not scratch a patient during use.

The utility model discloses a kind of foldable protection devices, specifically related to prefabricated stair protection technical field, including multiple kick panels and tread panels, kick panel and tread panel are sequentially arranged distribution from left to right, and the outer side of tread panel is fixedly connected with positioning mechanism;Positioning mechanism two fixed plates, the outer side of fixed plate is rotatably connected with positioning box, the inner side of positioning box is slidably connected with clamping block, one clamping block bottom is fixedly connected with bandage one, another clamping block bottom is fixedly connected with bandage two, the inner side of clamping block is fixedly connected with spring.The utility model is positioned to multiple tread panels by ratchet buckle and bandage, so that protection device formed by kick panel and tread panel can be stably attached with prefabricated stair, without screw fixing, reduce damage to stair surface, facilitate quick installation and removal;Kick panel and tread panel give consideration to the protection of tread and kick panel, provide comprehensive protection, and device can be repeatedly disassembled and used, improve applicability and installation efficiency.

The utility model discloses a connecting and clamping arm telescopic structure of a headphone, which comprises a connecting seat fixed at the end part of a connecting and clamping arm and provided with a first stroke limiting hole, and the connecting and clamping arm is provided with a second stroke limiting hole; the elastic sheet is arranged on the inner side of the lower end of the connecting seat, and a convex part protruding outwards is formed on the elastic sheet; a gear clamping groove matched with the convex part of the elastic sheet is formed in the inner side of the telescopic seat; the decorative cover is provided with a screw hole column, the screw hole column penetrates through the second stroke limiting hole and the first stroke limiting hole to be in butt joint with the counter bore of the telescopic base and is fixed through a first screw, so that the decorative cover and the telescopic base are installed outside the connecting base in a wrapping and clamping mode and can slide in a telescopic mode, and the screw hole column, the first stroke limiting hole and the second stroke limiting hole form a telescopic anti-disengaging structure; an anti-falling function can be realized; and the swing seat is arranged at the lower end of the telescopic seat and can swing in the vertical direction, and a connector of the swing seat is connected with the earphone main body, so that the earphone main body can swing in the vertical direction to automatically adjust the angle so as to be suitable for wearing of different head types, and the comfort is improved.

The application provides a stranding machine for cable manufacturing, and relates to the technical field of cable manufacturing.The stranding machine comprises a pay-off module, a stranding module and a wire outlet module.The pay-off module comprises a rack, a fixed plate is fixed on the rack, a drive motor is installed on one side of the fixed plate, a rotatable rotating plate is arranged on the other side of the fixed plate, an output shaft of the drive motor is connected with the rotating plate, and a plurality of pay-off assemblies are arranged on the rotating plate.The elastic clamping structure of the lock rod and the slot is used to replace the traditional screw fixation, when disassembling, only the position of the sliding plate needs to be adjusted, the push rod is matched with the sliding plate, the lock rod is driven to shrink through the connecting rod, the axle is automatically separated under the action of gravity, and reverse operation can be performed during installation, manual contact with the lock rod is not needed during the whole process, the plurality of winding rollers can be quickly disassembled, the method does not need tools, is convenient and fast, the downtime of the machine due to the replacement of the winding rollers is significantly shortened, and the working efficiency of the device is ensured.

This utility model discloses a novel fixed-base adhesive concealed box, comprising an integrally molded junction box body. The upper sidewalls of the junction box body have socket holes, and the upper end of the junction box body has an outwardly extending reinforcing port. Pre-embedded fixing holes are located at the four corners of the reinforcing port. The bottom of the junction box body has four shallow groove punched holes, and the lower part of the sidewalls of the junction box body has two shallow groove punched holes evenly distributed on each side. This utility model, through the integral molding of the junction box body and the multiple shallow groove punched holes on the sidewalls and bottom, meets the requirement of simultaneously pre-embedding multiple conduits. Furthermore, the pre-embedded fixing holes allow for direct screw fixation to the casting template, solving the problem of inconvenient pre-embedding in ordinary adhesive concealed boxes. Reinforcing ribs are provided between the reinforcing port and the sidewalls of the junction box body, effectively preventing the adhesive concealed box from easily breaking during pre-embedding.

Disclosed herein is a guide device and a driver, which allows for the preparation of an anatomic cavity for screw fixation of an implant or spacer, including the guidance for hole preparation, and guidance for insertion of screws, and or anchors, while selecting the amount of rigidity, and selecting the amount of visibility.

The utility model relates to the technical field of ceramic pots, in particular to a handle mounting structure of a ceramic pot. A handle installation structure of a ceramic pot comprises a handle connecting piece, a handle body and a pot body, and the handle connecting piece and the pot body are integrally formed and arranged on one side of the pot body. The handle connecting piece comprises a first connecting block and a second connecting block, one end of the first connecting block is attached to the pot body, and the other end of the first connecting block is connected with the second connecting block; a positioning mechanism is arranged between the second connecting block and the handle body, the second connecting block is inserted into the handle body through the positioning mechanism, and the second connecting block and the handle body are fixedly connected through screws. The handle installation structure of the whole ceramic pot is firm and stable, and the problem that in the prior art, the handle and the pot body are fixedly connected only through screws, and consequently the handle and the pot body are prone to falling off is solved. In addition, the mode that the handle connecting piece and the handle body are combined and fixed through the screws is fast and convenient, and the handle connecting piece and the handle body can be fast assembled and disassembled.

The invention relates to a component arrangement for a medical device comprising a first component with an outer surface, an inner surface and at least one recess extending between the outer surface and the inner surface, a second component comprising at least one screw boss with a longitudinally extended boss shaft and a bore, wherein the second component is arranged on the outer surface of the first component, the boss shaft projecting axially into the recess, and wherein an end face of the boss shaft does not project axially beyond the inner surface of the first component, and at least one screw with a screw shaft and a screw head, wherein the screw shaft is screwed into the bore and the screw head is axially supported on the inner surface of the first component, wherein the first component is subjected to compression between the screw head and the second component and the boss shaft is subjected to axial tension.which means that the first component is screwed to the second component.

The utility model relates to OLED backlight source technical field especially relates to a kind of ultra-thin OLED backlight source device. Its technical scheme includes rear shell, front shell, OLED backlight source module, drive shaft, driven shaft and mounting shaft, the inside fixed plate is placed in the rear shell upper end, the OLED backlight source module is set on the fixed plate upper end, the front shell is set on the rear shell upper side, the drive shaft and three groups of driven shaft are set in the rear shell inside, the mounting shaft is set in the rear shell side, the screw is set on the mounting shaft upper end, the threaded sleeve is set in the front shell lower end, the ball bearing one rotatingly installed with mounting shaft is embedded and installed in the inside four corners of the fixed plate, the drive shaft one end is provided with torsion block, the through-hole corresponding torsion block is clamped in the inside of the rear shell one end. The utility model is through linkage structure, only through rotating torsion block shell drives multiple screws to be fixed in front shell back, avoid the separate disassembly of multiple fixed parts, so that OLED backlight source module maintenance disassembly is time-saving and convenient.

The invention relates to the technical field of equipment for crushing materials through cutters, in particular to a crushing cutter and a crusher. The crushing cutter comprises a cutter head with a cutting edge and a cutter holder fixed on the cutter shaft, the cutter holder is provided with a mounting surface, the cutter head is fixedly mounted on the mounting surface of the cutter holder through a screw, the cutter head is provided with an adaptive surface adaptive to and attached to the mounting surface, and the screw is mounted at the attached part of the mounting surface and the adaptive surface. One of the top side of the adaptive surface of the tool bit and the top side of the mounting surface of the tool apron is provided with a staggered joint convex part, the other one of the top side of the adaptive surface of the tool bit and the top side of the mounting surface of the tool apron is provided with a matching part matched and attached to the staggered joint convex part, the staggered joint convex part and the matching part form a top joint, opposite to the top surface of the tool shaft, of the tool bit and the tool apron when the crushing tool is used, and the top joint and the mounting surface are staggered; foreign matter entering difficulty is increased, foreign matter does not easily enter a screw mounting area, screws do not easily deform and lose efficacy, and use reliability of the crushing cutter is facilitated.

An prosthetic endcap device for amputated bone comprises an annular body with an expansion shield and integrated fixation elements. The device features a trabeculated surface for tissue integration, multiple transosseous holes for screw fixation, and an intramedullary hole for bone attachment. The expansion shield extends 5-10 mm radially with a bulbous profile at 10-45 degrees. Key dimensions include 3-5 mm body thickness, 15-40 mm height, and 1-2 mm diameter transosseous holes. Construction uses biocompatible materials including titanium alloys and PEEK. The device can connect to a second endcap via adjustable rods for dual-bone applications. Additional features include radiopaque markers, longitudinal grooves for bone ingrowth, and myodesis holes for soft tissue attachment. This innovation addresses amputation challenges with adaptable fixation and growth accommodation.

The utility model relates to the field of industrial instruments, and provides a waterproof treatment structure for a connecting gap of an industrial instrument, and the structure comprises a main body assembly which comprises a housing; the first sealing assembly comprises a groove, a second sealing ring, a third sealing ring, a spring and a mounting hole; the grooves are formed in the four inner sides of the rear end of the shell, the second sealing rings are clamped in the grooves, the third sealing rings are connected to the middles of the second sealing rings in an injection molding mode, the springs are connected to the side edges of the second sealing rings through screws and located on the outer sides of the third sealing rings, and the mounting holes are formed in the four corners of the second sealing rings. The problems that a sealing ring is usually connected between a shell and a cover plate to achieve the sealing and waterproof effect, the shell and the cover plate are fixed through screws, the sealing and waterproof structure achieved through the sealing ring is simple, and the sealing effect is reduced after the sealing ring is used for a long time are solved. And the waterproof effect of the industrial instrument is influenced.

The thermocouple assembly for the heater comprises an installation shell, a convenient installation and disassembly mechanism and an assembly operation mechanism, the convenient installation and disassembly mechanism comprises a clamping groove, a clamping ring is arranged in the clamping groove, two sides of the clamping ring are fixedly connected with fixing plates, connecting holes are formed in the fixing plates, screws are arranged in the connecting holes, and the screws are connected with the clamping groove. Fixing holes are formed in the surfaces of the fixing plates in a penetrating mode. According to the utility model, through the arrangement of the convenient mounting and dismounting mechanism, the clamping rings slide to proper positions along the clamping groove, the clamping groove is arranged at the middle position of the surface of the mounting shell, the number of the clamping rings is two, and the clamping rings can be fixed in the clamping groove through bolts, so that the thermocouple assembly can be quickly positioned during mounting through the matching mode of the clamping groove and the clamping rings; the fixing plate is fixed on the corresponding structure in the heater through the screws, and compared with a traditional mode that the fixing plate is fixed in the heater through an external part, the installation mode greatly simplifies installation steps, and saves a large amount of time and labor cost.

A tool convenient for mounting a square inclined washer belongs to the technical field of tools for mounting square inclined washers and comprises a main body and a movable baffle. The main body is provided with a fixing plate which is provided with a plurality of screw holes. And one edge of the fixing plate is provided with a square inclined gasket bayonet. The movable baffle is in an L shape, one side of the movable baffle is fixed to the screw hole through a screw, and the other side of the movable baffle is perpendicular to the fixed plate. The movable baffle is fixed on the screw hole of the fixing plate and is clamped on the edge of the channel steel, the square inclined gasket is clamped by the square inclined gasket bayonet, at the moment, the square inclined gasket cannot rotate along with the square inclined gasket by screwing the nut, the set position of the square inclined gasket cannot be changed, and the installation is simple and reliable.

A device includes an acromion portion sized and shaped to replicate functions of the native acromion, and a fixation portion connected to the acromion portion, the fixation portion including a first arm portion and a second arm portion spaced apart from the first arm portion, wherein the first arm and second arm portions are positioned such that, when the device is positioned such that the acromion portion is in a native position of the absent native acromion, the first arm portion overlays a superior face of a scapular spine of the scapula and the second arm portion overlays an inferior space of the scapular spine of the scapula, wherein each of the first arm portion and the second arm portion includes at least one screw fixation point extending therethrough and configured to receive a screw therein so as to secure the device to the scapula.

The invention discloses a device for automatically fixing screws on workpieces, which is used for aligning and screwing a first workpiece and a second workpiece and comprises a first positioning assembly, a second positioning assembly, a transfer assembly and a screw screwing assembly, the first positioning assembly is used for shaping and positioning a first workpiece; the second positioning assembly is used for positioning a second workpiece; the transfer assembly is used for transferring the first workpiece to the second workpiece, so that a connecting hole in the first workpiece is aligned with a connecting hole in the second workpiece; the screw hitting assembly is used for hitting screws into the connecting holes formed after the first workpiece and the second workpiece are aligned. Through cooperation of the first positioning assembly, the second positioning assembly, the third positioning assembly, the transfer assembly and the conveying line, the alignment screw-driving fixing process of the outdoor unit chassis and the condenser is achieved, the whole process is automatic, the machining efficiency is high, and the labor intensity of workers and errors of manual operation are reduced.

The utility model discloses a storage battery electrode plate formation frame in the technical field of storage battery production, which comprises a first formation frame and a second formation frame, one side of the first formation frame is provided with the second formation frame, one side of the second formation frame is provided with a socket, the socket is fixedly connected with the second formation frame, a fixed rod is arranged in the socket, and the fixed rod is fixedly connected with the second formation frame. A clamping groove is formed in one side of the socket in an embedded mode, a storage groove is formed in one end of the fixing rod, a spring is arranged in the storage groove, the spring is fixedly connected with the storage groove, a buckle is arranged in the storage groove, and the buckle and the clamping groove are fixed in a clamped mode. According to the pole plate formation frame, convenience is provided for fixation of the two pole plate formation frames, fixation can be completed only by inserting the fixing rods into the sockets and clamping the buckles into the clamping grooves, threaded fixation is not needed, and the working efficiency is effectively improved.

The utility model discloses an easy-to-clean mould incubator which comprises a main body assembly, a mould box body and a mould box body, the quick assembly comprises a base plate, a cylinder, a supporting column, a lantern ring, a through hole and a locking rod; the base plate is placed in the box body, the cylinder is welded to the middle of the base plate, the supporting column is connected into the cylinder in a threaded mode, the lantern ring is connected to the supporting column in a sleeved mode, the through hole is formed in the side edge of the lantern ring, and the locking rod is connected into the through hole in a threaded mode. The mould incubator aims to solve the problems that the interior of an existing mould incubator needs to be cleaned before each culture and after each culture so as to prevent bred bacteria from affecting the culture result, but a supporting plate of the existing mould incubator is placed on a support, the support is fixed in the box through screws, multiple layers of fixable holes are formed in the support, and the fixing effect is poor. The height of the supporting plate can be adjusted, so that cleaning dead angles exist, and the interior of the box body can be damaged if the supporting plate is repeatedly disassembled.

The utility model provides a disposable needleless injection needle which comprises a pressure source instrument connecting part, a liquid medicine injection part, a liquid medicine storage part and a liquid medicine injection part, and a screw sequentially penetrates through a screw hole of the liquid medicine injection part and a screw hole of the liquid medicine storage part and finally enters a threaded hole of the pressure source instrument connecting part to achieve overall fixation. The side wall of the liquid medicine injection part and the side wall of the liquid medicine storage part are fixed through screws, the pressure source instrument connecting part is connected with an external micro-jet injector to obtain a pressure source, and the liquid medicine injection part is connected with an external injection tube to obtain liquid medicine. And the continuous broken injection of the liquid medicine is realized. The utility model has the beneficial effects that a trace amount of medicine can be quickly and accurately injected into the skin surface layer, so that pain and recovery time are reduced; under the condition that the needle head is not replaced, liquid medicine can be added at any time, and convenience and rapidness are achieved.

The utility model discloses a device beneficial to overturning of a floor with two bottoms and one face, and relates to the technical field of floor overturning, the device comprises a supporting assembly, the supporting assembly comprises a supporting bottom plate, a reinforcing assembly comprises a reinforcing plate, and a clamping assembly comprises a clamping body. A supporting bottom plate arranged in the supporting assembly plays a main supporting role, a reinforcing assembly and a clamping assembly are arranged at the top of the supporting bottom plate, a reinforcing plate, a connecting block and a reinforcing rib plate are arranged in the reinforcing assembly, a rib plate hole penetrates through the top of the reinforcing rib plate, and the rib plate hole is fixed to the top of the supporting bottom plate in cooperation with a screw, so that the supporting performance is higher, and the working efficiency is high; the clamping body is matched with the rotating ring to enable the clamping assembly to rotate for face changing, the limiting bin arranged at the top is matched with the limiting rod and the pressing disc to lock the rotating angle for face changing and paint brushing, the telescopic moving plate is further arranged at the bottom, the clamping distance can be controlled, and flexibility is high.

1. Name of the product in this design: Magnetic screwdriver bit holder (1). 2. Purpose of this product design: To be fitted onto the front end of a screwdriver bit to hold screws in place. 3. The key design feature of this product is its shape. 4. The picture or photo that best illustrates the key design points: Design 1 main view. 5. Design 1 is designated as the basic design.

The utility model relates to a vehicle-mounted disinfecting and spraying system, which aims to solve the technical problems that an atomizing net on an atomizing nozzle needs to be integrally replaced when being blocked at present, waste is caused, and the cost is high, and comprises a pipeline and an atomizing component, and the back end of the pipeline is connected with a liquid bin; the two atomization assemblies are connected with two connectors arranged on the two sides of the front end of the pipeline correspondingly. The atomization assembly comprises an atomization head; the atomizing head is connected with the outer end of the connector in a sleeving manner; the atomizing head is fixedly connected with the outer end of the connector through two symmetrically-distributed screws, the screws are matched with penetrating holes in the atomizing head in a penetrating mode, and the inner ends of the screws are in threaded connection with threaded holes formed in the outer wall of the outer end of the connector. The atomizer has the advantage that when the atomizing net on the atomizing head is blocked, the atomizing head can be independently detached to be cleaned or replaced.

This invention belongs to the field of agricultural machinery, and specifically relates to a hydraulic drip irrigation tape cutting peanut planter. Two seeding tray fixing frames are fixed to the sides of the frame at the middle of the machine. Inner baffles of the seeding trays are fixed to the inner frame of the seeding tray fixing frames with fixing screws. Multiple triangular pressure holes are provided on the outer circumference of both seeding trays. A fixing frame is located above the rear frame of the machine, and a hydraulic tape-cutting cutter device is fixed to the outer surface of the fixing frame with fastening bolts. The blade is installed in a width direction parallel to the rear frame of the machine, and its width is greater than the diameter of the drip irrigation tape. A hydraulic oil pipe for cutting the tape is led out from the top of the housing of the hydraulic tape-cutting cutter device. One end of the hydraulic tape-cutting cutter lifting control valve is fixedly installed on the diverter valve fixing frame. The device controls the cutting of the drip irrigation tape, making the peanut planter flexible and time-saving when changing rows for planting, improving work efficiency and reducing costs.

The utility model belongs to the technical field of supports, and particularly relates to an intelligent panel mounting support which comprises a support frame. A plurality of first screw holes are formed in the side wall of the bracket frame; a first screw is in threaded connection with the interior of the first screw hole; the end part of the first screw is rotationally connected with a first rubber block; a plurality of second screw holes are formed in four corners of the side wall of the bracket frame; a second screw is in threaded connection with the interior of the second screw hole; a plurality of first elastic pieces are fixedly connected to the positions, close to the ends of the second screws, of the outer side walls of the first screw holes. The first elastic piece is arranged in an arc shape, the intelligent panel and the support can be stably fixed by arranging the support frame with screws for fixing, and meanwhile, the problem of mechanical damage caused by direct contact between hardware is reduced by arranging the first rubber block; meanwhile, the friction force between the support frame and the wall can be increased, and the problem that the support frame is disengaged and shakes due to long-time placement under the influence of gravity is solved.