68 results about "Dental drill" patented technology

A first dental drill bit for creating a particularly shaped osteotomy in human jawbones includes: a mounting shank and cutting head. The cutting head includes: four blades protruding from an axis of the bit, each blade having a thickness and being positioned 90 degrees to each adjacent blade to form a cruciform-shaped cross-section. Each of the pair of blades are positioned 90 degrees apart, and the blades of each pair are offset laterally a distance about equal to one-half of the blade thickness. Each blade has a shaped periphery that includes: a first radiused periphery; and a second radiused periphery. The first radiused periphery is shaped to form a spherical frustum-shaped socket portion when rotated about the axis of the drill bit, and includes embedded diamond particles. The second radiused periphery is shaped to form a bullet shaped socket portion when rotated about the axis of the drill bit.

A dental drill bit for creating a particularly shaped osteotomy in a human jawbone includes: a mounting shank and cutting head. The cutting head includes: four blades protruding away from an axis of the drill bit, each blade having a thickness and being positioned 90 degrees to each adjacent blade to form a cruciform-shaped cross-section, with two pairs of the blades each positioned 180 degrees apart. Each of the pair of blades positioned 180 degrees apart are offset laterally a distance about equal to the blade thickness, and each blade has a shaped periphery that includes: a first radiused periphery; and a second radiused periphery. The first radiused periphery is shaped to form a hemisphere frustum-shaped socket portion when rotated about the axis of the drill bit, and the second radiused periphery is shaped to form a bullet shaped socket portion when rotated about the axis of the drill bit.

The application provides a planting mobile phone, which comprises a stopping device and is capable of being connected with a dental drill used for punching, the dental drill is arranged along a Z axis, the stopping device comprises a rotating member, a connecting member and a stopping member, the rotating member is provided with a spiral groove, the connecting member is connected with the spiral groove, the connecting member is capable of moving along the spiral groove, and the stopping member is connected with the connecting member, when the connecting member moves in the spiral groove, the stopping member is capable of moving linearly along the direction of the Z axis, and the length of the dental drill exposed from the stopping device is controlled. The application drives the stopping member to move by rotating the rotating member, the exposed length of the dental drill is adjusted, and then the control of the punching depth of the dental drill is realized. In the whole operation process, the dentist does not need to touch the stopping member, and the risk of infection of the wound and the operation time are reduced.

The present invention relates to a dental handpiece (1), the dental handpiece (1) comprising a head (4), a rotatable hollow shaft (15) rotatably disposed inside the head (4), drive means for rotating the hollow shaft (15), a chuck (26) having an elastic arm (27) for releasably clamping a dental drill (2), wherein the chuck (26) is fixed inside the hollow shaft (15) so as to rotate together with the hollow shaft (15), a ball (14) axially movably disposed inside the rotatable hollow shaft (15) and in direct contact with the elastic arm (27) of the chuck (26), wherein the ball (14) partially protrudes through an opening (17) at the upper end of the hollow shaft (15), the opening (17) being smaller than the size of the ball (14) and being disposed in the head (4) and, when pressed by the user, contacting the partially protruding ball (14) and configured to move the ball (14) downward between the elastic arms (27) so as to deflect the elastic arms (27) radially outward to release the dental drill (2), wherein the elastic arm (27) biases the ball (14) toward the opening (17) inside the rotatable hollow shaft (15) and biasing means for moving the push button (7) away from the ball (14), wherein the push button (7), when released, does not contact the ball (14).

The utility model relates to a dental drill device, a voltage regulator for a dental drill and a pneumatic switch of the voltage regulator. The pneumatic switch comprises a pneumatic valve and an infrared correlation sensor. The pneumatic valve and the infrared correlation sensor can be arranged on the pressure regulator body. A valve body of the pneumatic valve is connected with a high-pressure air source, and a telescopic push rod is arranged on the valve body. The push rod and the infrared correlation sensor are oppositely arranged, the infrared correlation sensor is provided with a transmitting end and a receiving end, and an infrared light path is formed between the transmitting end and the receiving end. When the push rod is driven by high-pressure gas output by the high-pressure gas source to be in an extension state, the push rod shields the infrared light path, and the pneumatic switch is turned on. When the push rod resets and is in a shortened state, the push rod is separated from the infrared light path, and the pneumatic switch is turned off. The pneumatic valve has the beneficial effects that the solid structural part pneumatic valve made of hard materials is adopted for bearing driving force of high-pressure gas, and the pneumatic valve is high in bearing capacity, not prone to being damaged and long in service life.

The utility model belongs to the technical field of medical instruments, and particularly relates to a dental drill guider for implantation, which comprises a handle and a guide sleeve, one end of the handle is provided with a connecting shaft which is bent deviating from the axis, and the guide sleeve is vertically arranged on the connecting shaft. A guide through hole is axially formed in the guide sleeve, an open groove communicated with the guide through hole is axially formed in the side wall of the guide sleeve, and a stop block with a narrowed groove opening is arranged on at least one part of the groove wall of the open groove. The open groove is axially formed in the side wall of the guide sleeve, so that a neck forming dental drill or a machine tapping dental drill can transversely enter the guide sleeve from the side of the guide sleeve, and the situation that the diameter of a drill bit of the dental drill is larger than the diameter of a rotating shaft and cannot be installed in the sleeve is avoided; and the baffle block is additionally arranged on the side wall of the open groove to reduce the size of part of the groove opening, so that the surrounding limitation of the inner wall of the guide sleeve on the dental drill is increased, and the dental drill can stably rotate in the sleeve.

The utility model belongs to the technical field of medical instruments, and particularly relates to a dental drill for implant surgery, which comprises a drill handle and a drill body arranged at one end of the drill handle, the drill body is provided with a plurality of blades axially and spirally distributed, and the blades converge on the end face far away from the drill handle to form an invasion cutting portion with taper. The cutting edges form a chambering part extending spirally on the cambered surface of the drill body, and end chip grooves with the number smaller than that of the cutting edges are formed in the cutting part. The axial end of the drill body is provided with the cutting blade with taper, the inclined groove for cuttings to invade is formed in the hole opening of the pre-formed small hole, so that the dental drill can smoothly drill into the pre-formed small hole, the blade is prevented from being clamped in the small hole, the cutting part is provided with the end chip grooves with the number unequal to that of the blade, and the blade back with the axial compression area unequal to that of the blade is arranged, so that the tooth drill can smoothly drill into the pre-formed small hole. The blades on the invasion cutting part are subjected to different axial pressures, and single blade concentrated stress is formed by using the pressure difference, so that the invasion efficiency is improved.

In some aspects, dental drill guides can include a body defining an outer surface and an interior hole for receiving and positioning a dental drill; a first end of the body defining a tapered lead-in portion of the outer surface; a second end of the body opposite the first end defining at least one lip feature configured to be gripped by a handling tool; an outer circumferentially formed recess around the outer surface; and a seating feature extending from the outer surface.

The invention discloses a machining table for false tooth form machining, and relates to the technical field of false tooth machining equipment, the machining table comprises a workbench, a fixed lamp holder and a tooth machine base are arranged on the two sides of one end of the upper portion of the workbench respectively, and a universal lamp tube is fixedly connected to the middle of the upper portion of the fixed lamp holder; an LED lamp cap is fixedly connected to the end, away from the fixed lamp holder, of the universal lamp tube, a connecting wire is arranged at the output end of the dental machine base, the dental machine base is electrically connected with a carving dental drill through the connecting wire, and a fixed base is fixedly connected to the middle of the end, away from the fixed lamp holder, of the workbench; a transparent baffle is arranged at the end, away from the workbench, of the fixing base. According to the working table, the transparent baffle is arranged in front of the working area, so that both hands are not hindered from passing, the sight is not blocked, meanwhile, disintegrating slag generated during carving is prevented from being splashed to the face area of a worker, the safety during carving is improved, corresponding protection equipment does not need to be worn, the refitting cost is extremely low, and the practicability of the device is enhanced.

1. The name of the product under this design: dental drill. 2. Purpose of this design product: This design product is a medical device used for dental drills. 3. The design key point of this appearance design product lies in the shape. 4. The picture or photo that best illustrates the design points: three-dimensional picture.

The utility model relates to the field of hardware machining, in particular to a drilling and tapping machine for hardware machining, which comprises a base, an air cylinder is fixedly connected to the middle of the right side of the top of the base, a supporting rod is fixedly connected to the driving position of the air cylinder, and a rotating column is rotatably connected to the left side of the lower portion of the supporting rod. The lower portion of the interior of the rotary column is fixedly connected with a tapping drill bit, a plurality of cooling holes are formed in the middle of the rotary column, the other ends of the cooling holes are arranged above the tapping drill bit, and the left side of the top of the supporting rod is fixedly connected with a water storage box. Hardware of different shapes can be clamped and fixed conveniently, meanwhile, the cooling device is installed, the machining face and the non-machining position of the tapping drill bit are cooled, the cooling efficiency is higher, particles such as metal chips and cuttings generated during drilling and tapping can be blocked by installing a baffle and a torque spring, the particles are prevented from being splashed, and the machining efficiency is improved. And the personnel is hurt.

A high-speed dental drill bearing comprises an outer ring, an inner ring and a plurality of rolling bodies located between the outer ring and the inner ring, the rolling bodies are placed in a retainer, the retainer comprises pockets corresponding to the rolling bodies in number, and the hole diameter of an opening, corresponding to one side of the inner ring, of each pocket is larger than that of an opening, corresponding to one side of the outer ring, of each pocket. The hole diameter of each pocket hole is gradually reduced from an opening corresponding to one side of the inner ring to an opening corresponding to one side of the outer ring; the retainer is integrally formed in an injection molding mode, and the retainer makes contact with the outer diameter face of the inner ring and rotates along with the inner ring. The retainer has the advantages that the retainer is integrally formed through injection molding, the tedious process of traditional turning machining is changed, production cost and machining difficulty are reduced, production efficiency is improved, and the problems of low efficiency and high cost caused by complex turning machining are effectively solved.

The novel dental drill bit comprises a drill rod, a limiting part and a spiral drill bit body which are sequentially connected, a reverse spiral groove is formed in the periphery of the spiral drill bit body, the front end of the spiral drill bit body extends from the groove wall of the reverse spiral groove to form a tooth-shaped cutting edge, and the limiting part comprises a limiting sleeve and a connecting part which are arranged in a sleeved mode. The two ends of the connecting part are connected with the drill rod and the spiral drill bit, the spiral drill bit is arranged in the limiting sleeve, the front end of the spiral drill bit partially extends out of the limiting sleeve, the limiting sleeve provides axial limiting for the spiral drill bit, the liquid inlet channel penetrates through the whole drill bit, and a water outlet hole is formed in the center of the front end of the drill bit. The tooth-shaped cutting edges are used for cutting and reaming, a bone disc can be formed in front of the drill bit and used for protecting sinus membrane, the limiting sleeve provides axial limiting for the spiral drill bit, the reverse spiral groove can contain chippings, the working resistance of the drill bit is reduced, the hole wall can be extruded to improve bone density, cooling liquid can flow out of the liquid inlet channel and the liquid outlet hole, bone burn is avoided, and the service life of the spiral drill bit is prolonged. And the use experience of the user can be better improved.

The utility model discloses a dental drill guider for oral implantation, which belongs to the field of medical instruments and comprises a fixing sleeve, a fixing structure is mounted in the fixing sleeve and consists of a fixing plate, a pull rod, a fixing spring and a drawing block, the pull rod is fixedly mounted on the fixing plate, the fixing spring is sleeved on the pull rod, and the drawing block is sleeved on the fixing spring. The pulling block is fixedly installed at the outer end of the pull rod, a replaceable guide sleeve is installed in the fixed sleeve and composed of a sleeve body, two limiting insertion rods and two fixed insertion rods, the two limiting insertion rods are symmetrically and fixedly installed on the outer wall of the sleeve body, and the two fixed insertion rods are symmetrically and fixedly installed on the outer wall of the sleeve body. According to the dental drill guider, by arranging the dental drill guider composed of the fixed sleeve, the fixed structure and the replaceable guide sleeve, the replaceable guide sleeve can be replaced according to needs, the replacement steps are simple and convenient, and therefore the replacement efficiency of the replaceable guide sleeve can be improved.

1. The name of the design product: drill bit of dental drill. 2. The use of the design product: the local part of the design is used as a drill bit of a dental drill, the drill bit of the dental drill is used for cutting and cutting, and the whole dental drill is used for treatment of teeth. 3. The design points of the design product: the shape of the local part. 4. The picture or photo that best shows the design points: perspective view. 5. Other circumstances that need to be explained: in the design application, the solid line is used to represent the local part, and the dotted line is used to represent the part not required to be protected.

An automated dental drill includes a dental drill housing that includes a mouthpiece housing section and a one or more degrees of freedom drive housing section; an end effector drive support having a shaft section that is at least partially positioned in the mouthpiece housing section, and an end effector for the cutting of a native tooth or dental appliance to a desired tolerance. The end effector is positioned on the end effector drive support. The automated dental drill also includes a power source that drives the end effector and is coupled to the end effector and a one or more degrees of freedom drive assembly to direct the end effector along one or more degrees of freedom relative to the mouthpiece housing section.

The invention discloses high-cobalt stainless powder metallurgy high-speed steel and a preparation method and application thereof.The high-cobalt stainless powder metallurgy high-speed steel comprises, by mass, 15%-25% of Cr, 1.4%-1.6% of C, 5%-10% of Co, 0.05%-0.10% of B, 0.1%-0.3% of La and the balance Fe and inevitable impurities, the B and the La are preferably added in the form of lanthanum hexaboride (LaB), and the high-cobalt stainless powder metallurgy high-speed steel is prepared through ball milling, cold pressing, vacuum sintering and multi-section heat treatment processes. The alloy has the advantages of compact structure, fine carbide, pure grain boundary, high hardness of HRC 67-69, salt mist corrosion resistance of more than or equal to 290 hours and excellent wear resistance, and is suitable for manufacturing high-end cutting tools in complex corrosive environments, such as military daggers, dental drill bits, medical cutting instruments, stirring and crushing knives and the like.

A method of surface treating a drill, the drill including a shaft extending along a central longitudinal axis from a proximal end to a distal end, the proximal end of the shaft including a shank adapted for connection to a rotary driver, the shaft further including, distal of the shank, a fluted section including at least one flute extending along the longitudinal length of the fluted section, the method including the steps of: acid etching at least a portion of the fluted section of the shaft in order to create a visible matted effect, subsequently electro-polishing at least the portion of the fluted section of the shaft in order to visibly reduce the matted effect and subsequently creating one or more visual marking within the portion of the fluted section of the shaft.

The invention discloses a device capable of verifying torque in batches, and relates to the technical field of dental drill equipment.The device comprises a lifting assembly, a control assembly is installed on one side of the lifting assembly, a conveying assembly is installed on the front face of the lifting assembly, and a visual verification assembly is installed on the other side of the lifting assembly; conveying frames are fixedly installed on the two sides of the conveying assembly, a conveying belt is wound around the inner sides of the conveying frames, and a first side frame is installed on one side of the conveying assembly. By arranging the conveying assembly, when the torque of an implant is tested, the implant can be arranged on the surface of a conveying belt, the conveying belt is driven to move and convey by utilizing the driving force of a motor, and when the implant is conveyed to the position of a first side frame, a movable clamping plate can be pushed by an air cylinder to clamp the implant on a fixed clamping plate; therefore, the detection efficiency can be improved in a batch conveying mode, and the overall working efficiency can be improved.

An automated dental drill includes an end effector, including a dental tool for disposition at least partially in a patient's mouth and to perform an operation on a tooth. A tooth clamp releasably rigidly attaches to at least one tooth. A drive assembly is controlled by a processor and positions the end effector with a first at least three degrees of freedom, relative to the tooth clamp. The drive assembly remains outside the patient's mouth. A clamp connector connects the tooth clamp to the drive assembly. With the tooth clamp coupled to the drive assembly and the tooth clamp attached to the at least one tooth, position and orientation of the drive assembly remain fixed, relative to the at least one tooth. A passive cantilever arm, mechanically coupled between a support structure and the drive assembly, has a second at least three degrees of freedom and supports the drive assembly.

A non-resorption high-speed mobile phone comprises a head shell, a bearing seat, a non-return sleeve, a flat gasket, a rotating assembly and a rear cover assembly. The bearing seat is installed in one end of the head shell, the rear cover assembly is installed at the other end of the head shell, one end of the rotating assembly is rotatably installed on the bearing seat, the other end of the rotating assembly is rotatably installed on the rear cover assembly, and the rotating assembly is located in the head shell; one end of the non-return sleeve is installed on the bearing seat, the other end of the non-return sleeve can abut against the rotating assembly, and the flat gasket is installed on the bearing seat. The non-resorption high-speed handpiece provided according to the content solves the problems that in the prior art, after a dental drill high-speed handpiece stops working, a mandrel needs to be completely stopped for a long time and can be taken out of an oral cavity after stopping, so that working efficiency is low, the interior of the dental drill high-speed handpiece can be in a negative pressure state after shutdown, and the working efficiency is low. And impurities and liquid in the oral cavity can be adsorbed to enter the inner part to be polluted, so that the service life is greatly shortened.

The present invention relates to a dental handpiece (1) comprising: a dental handpiece (1) comprising: a head (4): a rotatable hollow shaft (15) which is rotatably arranged inside the head (4): a driving means for rotating the hollow shaft (15): a chuck (26) having resilient arms (27) for releasably clamping a dental drill (2), wherein the chuck (26) is fixed into the hollow shaft (15) so as to rotate with same: a ball (14) which is axially movably arranged inside the rotatable hollow shaft (15) and in direct contact with the resilient arms (27) of the chuck (26), wherein the ball (14) partly protrudes through an opening (17) on the upper end of the hollow shaft (15), and wherein the opening (17) is smaller than the size of the ball (14): a push button (7) which is arranged in the head (4) and configured to contact. when pressed by a user. the partly protruding ball (14) and move the ball (14) downwardly in between the resilient arms (27) so as flex the resilient arms (27) radially outwards and release the dental drill (2), wherein the resilient arms (27) bias the ball (14) inside the rotatable hollow shaft (15) towards the opening (17); and a biasing means to move the push button (7) away from the ball (14), wherein the push button (7) is not in contact with the ball (15) when it is released.

A dental handpiece and drill cyclic pressure life testing device includes a base plate, an adjustment seat mounted on one side of the base plate, a support column above the adjustment seat, a mounting block connected to the support column, a dental handpiece mounting seat connected above the mounting block, and a pressure testing bracket mounted on the other side of the base plate. A side mounting plate and a front mounting plate are connected to the pressure testing bracket. A motor and a rotating shaft are mounted on the side mounting plate, the motor driving the rotating shaft to rotate. An eccentric wheel is mounted on the rotating shaft, and a cam is fitted around the eccentric wheel. A push rod is mounted on the front mounting plate, and the cam is connected to the tail of the push rod via a pin. A sleeve is mounted at the front end of the push rod, and a pressure sensor is installed inside the sleeve. A pressure seat is mounted at the front end of the sleeve, and a spring is installed between the pressure seat and the pressure sensor. A pressure block is mounted on the surface of the pressure seat. This invention simulates the continuous working state of a dental drill to complete the life test of the micro-bearings inside the dental drill.

The utility model relates to the technical field of tooth implantation drilling equipment, and provides a multi-blade structure dental drill which comprises a drill rod, a guide blade and a side blade, the guide blade is arranged at one end of the drill rod and used for machining a guide hole in the axial direction of the drill rod. The side cutting edge is arranged on the side face of the drill rod. The side cutting edges extend in the axial direction of the drill rod.

The utility model provides a high-sharpness dental drill with good centering, which comprises a cutter handle and a cutting edge which are connected into a whole. A connector part is arranged at the end, away from the cutting edge, of the cutter handle, the cutting edge comprises spiral cutting edges and end edges, the spiral cutting edges spirally extend along the axis of the cutting edge, and a chip groove is formed between every two adjacent spiral cutting edges. The end edge is arranged at one end of the blade. The end edges comprise centering end edges and cutting end edges, the centering end edges and the cutting end edges are integrally and sequentially arranged outwards along the center of the edge, and the included angle between every two centering end edges is smaller than the included angle between every two cutting end edges. During use, the centering end edge firstly makes contact with the jaw bone, then the cutting end edge conducts drilling, and chippings generated in the drilling process are discharged from the chip discharging groove along with the spiral cutting edge. The centering end edge with the small included angle mainly plays a role in extruding and shearing, cutting resistance is reduced, the cutting force of the inner edge and the cutting force of the outer edge are balanced, the dental drill is prevented from deviating to one side, and drilling precision and stability are improved.

The utility model relates to the technical field of dental drill point detection, in particular to a dental drill point performance detection device for copper-doped hydroxyapatite. The utility model provides a dental drill point performance detection device for copper-doped hydroxyapatite, which can be used for detecting the shape regularity of a drill point and avoiding unstable operation or tooth damage caused by irregular shape. A dental drill point performance detection device for copper-doped hydroxyapatite comprises a bottom frame, a first motor and the like, and the first motor is connected to the upper left portion of the bottom frame. In the rotating process of the drill point, the pressure sensing ring is used for detecting the borne pressure, when the shape of the drill point is irregular, the pressure values detected by the pressure sensing ring are different, and the larger the change of the pressure values detected by the pressure sensing ring is, the more unstable the use of the drill point is. The effects that the shape regularity of the drill point can be detected, and unstable operation or tooth damage caused by the irregular shape is avoided are achieved.

The utility model discloses a stop drill for oral implantation, which relates to the field of oral implantation and comprises a dental drill shell, a dental drill body is arranged in the dental drill shell, a drill bit is arranged at the lower end of the dental drill body and penetrates through the lower end of the dental drill shell, and one side of the dental drill shell is fixedly connected with an inclined rod. By the adoption of the structure, when the threaded rod rotates in the threaded hole, the threaded rod can slowly stretch out of the threaded hole, so that the stop plate can be adjusted to a certain degree when the threaded rod stretches out of the threaded hole, and then the length of the drill bit can be adjusted; the distance of the stopping plate can be adjusted by pushing the adjusting plate forwards and backwards, and the stopping assembly is not directly connected with the drill bit, so that normal work of the drill bit is not affected, meanwhile, the stopping assembly is not separated when the drill bit rotates, and the safety of the device is improved.

An embodiment of the present invention provides a dental drill device comprising: a shank part coupled to a dental handpiece; a drill body part which is connected to a lower part of the shank part, rotates by the rotational force of the dental handpiece, and includes a plurality of spiral grooves arranged at equal intervals on an outer surface thereof and a plurality of lands formed between the spiral grooves, wherein alveolar bone particles generated during drilling of the alveolar bone are moved through the grooves; and a drill blade part formed at a lower part of the drill body part and configured to drill the alveolar bone when rotating, wherein the width of each of the lands is formed to be larger than or equal to 0.4 mm or smaller than or equal to 1 mm.

The utility model relates to the technical field of dental drill equipment, and discloses dental drill equipment for verifying cutting equipment. The lifting table is slidably mounted on the workbench; the dental drilling machine is movably connected below the lifting platform, a detachable drill bit is arranged at one end of the dental drilling machine, and the other end of the dental drilling machine is connected to a motor driven at a preset rotating speed by arranging a hose; the clamp is mounted in the clamp sliding groove in the workbench; one side of the lifting table is connected to a motor driven by a preset load, a rotating seat is arranged at the bottom of the other side of the lifting table and rotationally connected with a rotating block, and a fixing seat for fixing the dental drill is slidably connected to the rotating block through a sliding rod; a first lead screw is arranged in the clamp sliding groove, the first lead screw is in threaded connection with a clamp base at the bottom of the clamp, and the first lead screw rotates to drive the clamp to move. The dental drill equipment for verifying the cutting equipment has the advantages of being capable of testing top cutting of the drill bit and side cutting of the drill bit and capable of flexibly clamping bone blocks.

The utility model belongs to the technical field of oral dental drills, and particularly relates to a dental drill special for an oral cavity. Comprising a handle, the right end of a second connecting plate is a cambered surface, and a plurality of locking grooves are formed in the cambered surface of the second connecting plate on the rear side; a connecting column is horizontally arranged between the two first connecting plates, a sleeve is fixed to the inner side wall of the first connecting plate located on the front side, the front end of the connecting column is independently installed in the sleeve in a penetrating mode, the connecting column is sleeved with a first limiting ring, and a thrust assembly for pushing the connecting column to move backwards is arranged between the first connecting plate located on the front side and the first limiting ring. A button is fixed to the rear end of the connecting column, a key groove communicating inside and outside is formed in the first connecting plate on the rear side corresponding to the button, and the pressing end of the button penetrates out of the key groove and is located on the outer side of the first connecting plate. And a locking block is fixed on the connecting column. According to the angle-adjustable drill, the lock block is controlled by pressing the button to lock or unlock the lock groove, so that the drill with the angle adjusted can be conveniently locked.