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Device for container trunnion grinding Device comprises a bracket attached to a container and including a plate with an inner boring made along a trunnion diameter, and set on the non-machined section of the trunnion. A support with a hole whose axis coincides with the trunnion axis is attached to the plate. An axle is installed in the support hole, a casing able of swinging is mounted on the axle and connected to a cross bar to which U-shaped swinging levers connected by rams in the lower part are coupled. The rams are movably fitted with a screw cross-feed mechanism with a pneumatic grinding machine being attached to its quill. The screw cross-feed mechanism is coupled with a quill of a screw longitudinal feed mechanism of the grinding machine placed inside a handle attached to the swinging lever. A grinding disk or a rolling disk is installed on the grinding machine shaft. |
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Invention relates to an abrasive instrument, containing melted grains. Abrasive grains have a chemical composition in wt % based on oxides: Al2O3 remaining part to 100%, ZrO2+HfO2 16-24%, MgO in such amount that a weight ratio (ZrO2+HfO2)/MgO constitutes from 25 to 65, oxides different from Al2O3, ZrO2, HfO2 and MgO 0-2%. |
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Abrasive tool is made as a casing bearing abrasive elements and consisting of an outer ring and an inner ring, which are set concentrically, coupled to each other and made from a conducting material. The rings are coupled by radially set elements in the form of pins with their number and section being chosen according to the specified current density parameter under the condition that the tool is equally strong in a radial and tangential direction. The space between the outer and inner rings is filled by a high-strength composite material with low density with its thickness being less than the rings width. |
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Method for pulse rolling of raceway of thrust ball bearing race Mandrel in the form of a hollow arbour is used, it is fitted with deforming elements in the form of balls set in the holes evenly provided at the end face of the hollow arbour. The mandrel is imparted with a periodical pulse load by means of a pulse load hydraulic cylinder in which a striker and a waveguide are installed. A workpiece is fixed at a bearing flange set so that to be able of rotating in respect to the longitudinal arbour axis. Rotational movement is imparted to the workpiece by means of the stem of the static load hydraulic cylinder having screw-shaped splines, being placed in the hollow arbour and passing in the spline hole of the said bearing flange. A helical coil compression spring is installed between the end face of the hollow arbour and the bearing flange. |
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Device for abrasive disk grinding Method involves rotation of a grinding disk and translational displacement of a workpiece being treated. The grinding disk is rigidly fixed between two disks from a conducting material which are connected to the negative pole of a power supply source and are set with a gap in respect to the surface of the workpiece connected to the positive pole of the power supply source. An electrolyte is supplied by a connecting pipe to the said gap between the disks and the treated workpiece for the purpose of electrochemical softening of the material on the treated workpiece section with its further removal by the grinding disk. |
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Shaped abrasive particles with inclined sidewall Invention can be used for production of abrasive materials. In compliance with this invention, abrasive particles represent shaped abrasive particles with inclined sidewall. Every shaped abrasive particle contains aluminium alpha-oxide and gas first and second faces separated by thickness t. Said shaped abrasive particles feature forming slope angle α between second face and inclined sidewall making 95-130 degrees or inclined sidewall with radius R between first and second faces. Radius R makes 0.5-2 if thickness t. Abrasive material with coating comprises bottom adhesive layer on the substrate first smooth surface, shaped abrasive particles making the abrasive layer and top adhesive layer. Most shaped abrasive particles are secured to bottom adhesive layer by inclined sidewall and feature orientation angle β equal to 50-85 degrees. Abrasive layer consists of shaped abrasive particles by at least 5% by weight. |
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Encased inker detachable roller Invention relates to inker roller. This roller is located in the case on bolt between its head and cover to run therein. Said case has the recess for inker, bolt head and cover clamps. Bolt head clamp is composed of truncated cone parting face and has the yoke aligned with working roller rotational axis. Cover clamp is composed of circular cylinder parting face. |
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Device comprises a base part to fix a workpiece having the surface for the workpiece fixation as well as a rotational base part having the surface for the adjustment of an inclination angle which is inclined in respect to the axis of the rotational base part. The base part meant for the workpiece fixation is fitted by the surface for the inclination angle adjustment being opposite to the workpiece fixation surface, inclined in respect to the latter and contacting with the surface for the inclination angle adjustment of the rotational base part. The device comprises also a joint unit used to connect the workpiece fixation base part and the rotational base part around a vertical annular projection with the possibility of adjustable rotation, the said projection is provided on the surface of contact interaction of the workpiece fixation base part or the rotational base part to hold the opposite side at turning. |
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Invention provides for high reliability and rigidity of the whole device along with accurate adjustment of inclination angles and of turning of the workpiece fixed on the device. The device comprises a base part to fix a workpiece having the surface for the workpiece fixation as well as a rotational base part having the surface for the adjustment of an inclination angle which is inclined in respect to the axis of the rotational base part. The base part meant for the workpiece fixation is fitted by the surface for the inclination angle adjustment being opposite to the workpiece fixation surface, inclined in respect to the latter and contacting with the surface for the inclination angle adjustment of the rotational base part. The device comprises also a joint unit used to connect the workpiece fixation base part and the rotational base part with the possibility of adjustable rotation. |
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Abrasive mixture for abrasive pastes and tools and method for production thereof Invention relates to mechanical engineering and can be used in making abrasive tools and pastes for polishing articles made of solid materials and paint coats. The abrasive mixture contains as a cutting component abrasive particles which are mixed with a binding material and consist of carbon nanoparticles in form of graphenes with monoatomic thickness with sizes ranging from 0.1 mm to 2 mm and graphene pumice, which is graphene clusters in form of stacks of plane-parallel graphenes joined to each other at one of their ends. When preparing the abrasive mixture, the cutting component is mixed with binding material in a vacuum chamber at low pressure. Pressure is then raised to atmospheric pressure before the binding material begins to harden. |
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Method and device for stop valve sealing surface Processing of sealing surface at stop valve connection pipe end comprises the steps that follow. Valve top part and body built-in elements are remove from stop vale body to clear the body bore. Clamp counter-support is placed via body bore (14) into connection pipe or the other connection pipe and secured to its inner wall. Machining tool with support is fitted into the body and placed on said counter-support. Said tool process the sealing surface. This tool is withdrawn from counter-support and the body via its bore. Aforesaid clamp is detached from connection pipe and withdrawn via body bore. Valve top part and built-in elements are places at the body. Proposed device comprises clamp with counter-support, fastener (47) to interact with connection pipe inner wall, machining tool with support to be mounted at counter-support. |
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Invention relates to machine building and can be used in grinders equipped with grinding body clamp. Grinder comprises rectangular plate and two clamps at its opposite sides. Every said clamp has clamping part displacing at said plate between clamping and unclamping positions to contact with or to move away from the plate side surface. Bearing pin is arranged at said plate, nearby clamping part, as well as a working element with first and second ends engaged with bearing pin to run therewith. Said first end is connected with clamping part while second end extends under clamping part. Said working element can be elastically deformed in directions of stretching and compression between connection end and working end. Hooking element if arranged at said plate opposite said bearing pin to engage with working element working end. |
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High-precision inner surface grinding device Invention relates to machine building and can be used for grinding inner cylindrical and conical bores of precision parts at circular grinders and at repair and small-lot production. Proposed device comprises supports for location surface of revolving processed part, attachment clip with bolts and dog to transmit rotation to said part from the machine tool cage. Besides, it comprises springs secured at clap bolts and machine tool front head to press the part to machine tool stationary centre. |
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Method of grinding taper roller spherical end faces Invention relates to machine building and may be used in bearing production for grinding taper roller spherical end faces. Proposed method comprises fitting of conical roller by its conical surface in the sleeve for both to be revolved about their common axis in lengthwise mirror plane of grinding wheel. Spherical end is ground at 3-position tool with round turntable with three spindles equipped with collet and adjustable stops-pushers and with fixed cam. At first position, sleeve with conical roller is spring loaded at its end relative to stop-pusher and located at the spindle collet and displaced in axial direction to contact of the end of conical roller opposite the processed spherical end with stop-pusher and secured. At second position, rough and finish grinding of conical roller spherical end are performed with axial feed of grinding wheel. At third position, conical roller is pushed from the sleeve by said stop-pusher and fixed cam. |
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Plunger pair and metering pump comprises at least one external part of crystal based on aluminium oxide alpha-modification and at least one internal part of crystal based on aluminium oxide alpha-modification, preferably, leucosapphire with working surface roughness Ra2÷5Å. Said surface smoothness is brought about by processing the cylindrical surfaces of part of crystal based on aluminium oxide alpha-modification. This method comprises drilling the preliminary blanks of part of crystal based on aluminium oxide alpha-modification with the help of diamond tool. Three-stage mechanical processing is performed by diamond tool with lubricant-coolants and sequential decreased in abrasive grain size to 125/100 and/or 100/80 mcm. Internal strain is removed from blanks by annealing at muffle furnace. Surface is processed by semisoft or soft grinding wheel or by lap with diamond 5/3 mcm or 1/0 mcm grain on clock oil. Tribochemical finishing of the surface is performed by colloidal SiO2-based composition. |
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Sharpening-and-finishing apparatus for sharpening of cutting pairs of shearing machines Sharpening-and-finishing apparatus includes a sharpening element and a holder to press a part in the form of a knife or a comb to be sharpened to the sharpening element. The apparatus is equipped with an electrical control system with a position control sensor of the part to be sharpened relative to the belt, a sensor of pressure force of the part to the belt and a temperature sensor in the contact zone of the part with the belt. In order to perform finishing of combs, the apparatus is equipped with a rheostat switch of number of motor revolutions; with that, the sharpening element is made in the form of an endless belt. The holder has the possibility of controlling pressure force of the part to be sharpened to the belt surface owing to changing the spring compression degree and with supply of cooling liquid to the contact zone of the part with the belt. |
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Abrasive article (versions) and method of its forming Invention relates to grinding and may be used for production of abrasive tools, for example, grinding wheels. Abrasive article comprises abrasive body with abrasive grains in binder. Abrasive body comprises the region of passivation including spinel material that covers at least 60% of abrasive grains. Note here that said spinel material can be arranged at interface between abrasive grains and binder matrix. |
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Method of diamond abrasive jet cutting Working fluid flow is forced into nozzle device. Suspension of diamond submicron particles is forced into capillary tube and accelerated therein by pressure difference at capillary tube ends. Note here that capillary tube is subjected to low-frequency oscillations while suspension is subjected to ultrasound oscillations. Working fluid is mixed in nozzle device with suspension to force formed jet to process material. |
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Discretisation method of abrasive tool Radial holes are applied onto cutting surface of the tool in lines parallel to the tool axis. Application is performed by means of a hydroabrasive high-pressure jet in the direction of each line of radial holes per pass. The invention describes discretisation modes of the tool surface, which include values of water pressure in a working circuit, abrasive substance consumption, movement speed of the cutting head with the hydroabrasive jet and size of abrasive particles. |
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Vibration unit with toroidal chamber Vibration unit comprises toroidal working chamber with vibrator fitted at the bed. Working chamber has multistart helical surface with screw grooves inside and outside said working chamber at the angle to its axis in the form polygonal-shape different size pockets made along the working chamber perimeter. Said working chamber is composed of sections, each being composed of circular sector with polyhedral surface. Said sector consists of coiled strip flexed in crease arranged at the angle to strip edges of different length, spacing between them being equal to the length of every side of said pockets to make different-size quadrangle with two parallel sides. Sections are interconnected by free sides of said quadrangles. |
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Invention can be used in manufacturing of diamond cutoff wheels for cutting of hard and brittle materials such as ruby, sapphire, ceramics. A wheel comprises a disk casing with grooves for the depth of (0.05-0.1) of the diamond wheel width being made on its side surfaces. The grooves profile is shaped according to a curve specified by an equation which defines a current curve angle read from the curve start on the wheel periphery, depending on the current curve radius, diamond wheel radius, curve end radius and diamond layer height. Afterwards the diamond layer is electrodeposited on the wheel casing. |
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Machine for chemical finishing hardening processing of parts Machine comprises a drum horizontally set on a frame and fitted by multiple-thread screw surface, devices for its loading and unloading, and a rotary drive. The drum perimeter is fitted by spiral grooves inside the drum which are made as curvilinear pockets with centres of curvature set inside the drum cross-section. The drum is produced from three or more identical rectilinear strips which are twisted in the longitudinal direction in respect to the longitudinal axis and bent by a spiral line in the cross direction on a cylindrical mandrel to form three or more inner curvilinear convex surfaces with the centres of curvature being inside the drum and extensions in the form of helical blades along its whole length. A wave-like spring with flat section of turns is provided as well as a device to adjust the turn pitch by stretching or compression of the spring. |
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Centreless grinding method for very hard powdered material Force attributable to one abrasive grain is defined for an abrasive tool beforehand. Force of cutting grains retention by abrasive tool binding substance is set assuming that cutting force attributable to one abrasive grain does not exceed the force of cutting grain retention by the tool binding substance. Maximal permissible depth of grinding is determined depending on the parameters of very hard powdered material being processed, abrasive tools and grinding modes. Through-feed processing of an item is carried out for the depth not exceeding the maximal grinding depth. |
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Abrasive powder contains silicon oxide, iron oxide, aluminium oxide, calcium oxide, magnesium oxide, manganese oxide and titanium oxide. Ratio of weight fractions of said oxides in abrasive powder are given. |
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Abrasive powder contains silicon oxide, iron oxide, aluminium oxide, calcium oxide, magnesium oxide, manganese oxide and titanium oxide. Ratio of weight fractions of said oxides in abrasive powder are given. |
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Plant comprises a sealed vessel with abrasive particles with the vessel cavity being connected to a supercharger. The supercharger consists of a rotatory ring of a casing and a blade rotor. The blade rotor is fixed on a rotatable base of a trolley and is mounted on a shaft of an internal combustion engine. A nozzle is installed in the rotatory casing ring at a tangent to the circle. |
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Method of sharpening skate blades Method comprises preliminary sharpening the blade fixed in a fixing device by the tool with the fixed abrasive and polishing the working surface of the blade with the rotating polishing pad in the form of a leather buffwheel with use of polishing paste. The latter is uniformly applied to the preheated working surface of the blade. The buffwheel is uniformly passed on the working surface of the blade along it with a rate of 1 to 2 cm/sec first to the one side of the blade, and then to the other. The number of passes is selected from two to eight depending on the material of the blade. The speed of rotation of the buffwheel is selected in the range of from 20 to 30 thousand rev/min. |
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Modular grinder for hole processing Invention relates to machine building and can be used for bore grinding with cooling of rotary or stationary blanks. Modular grinder comprises at least two identical modules fitted on tool holder and jointed together by their butts and centred relative to the tool rotational axis. Every module comprises the case with radial guides for identical segments radially displacing therein and furnished with hones fitted at their ends. Modules at tool holder can be fed into bore to be roughed and finished and allow replacement of segments with worn-out hones with tool dismantling. |
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Abrasive article (versions) and method of its forming Invention relates to processing by abrasives and may be used for production of composite material machining tools. Abrasive article has abrasive body including abrasive grains made of microcrystalline aluminium oxide and contained in glass-like binder. The latter features abrasive grain dissolution factor not exceeding about 1.5 wt %. |
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Proposed device comprises knurling head with roller fitted on pin engaged with stick-like holder. Adapter one side has groove while opposite side can be retained in machine tool clamp. Clamp through lengthwise complex-shape slot accommodates knurling head and pusher to displace there in and along. Roller is secured at one end of said holder, its opposite staying in contact by end surface with said pusher. Pusher opposite end interacts with lever fitted on the holder for angular displacement and with weight fitted on free end. |
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Method of surface hardening for ferromagnetic gear wheels and device for its implementation Invention refers to machine building industry, namely, to surface hardening of gear wheels made from ferromagnetic materials. One gear wheel is mounted on a shaft, the other - on an axis. Interlocking arrangement of the gear wheels is provided. Gear wheels are installed in the inner cavity of a split casing which is filled by cast iron shot with the diameter of 0.1-0.4 mm. The split casing is placed in the through groove of a magnetic conductor. Angular motion of the gear wheel set on the shaft is provided by an external drive along with turning of the other gear wheel in relation to its own axis during 0.1-0.2 hours. The magnetic conductor forms a magnetic circuit and generates a variable magnetic field with its strength in the teeth contact zone of the hardened gear wheels being equal to 1×105-1×106 A/m and the frequency of its oscillations being equal to 20-70 Hz. |
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Hand-held machine with plug-in device Hand-held machine comprises a body (2) made from several parts and consisting of a handle case (4) and a motor case (3) to set a drive motor (5), and a plug-in device set in the hand-held machine. The plug-in device comprises the first plug-in part (16) connected to the drive motor (5) of the hand-held machine and the second plug-in part (17) connected to the other unit (11) of the hand-held machine. At that the first (16) and the second (17) plug-in parts are joined in a common plug-in part (15) which is set in the handle case (4) and from which electric connection cables (13) are laid to at least one electric component (5, 11) placed in the motor case (3). The first plug-in part (16) and the second plug-in part (17) are fitted by plug sockets (20, 21; 22, 23) to plug-in the electric connection cables with the sockets being arranged on the same side and one above the other. |
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Method to obtain blank for pipeline lock Method includes half-yoke manufacturing of sheet metal and producing in it holes for connection bolts. In this process, half-yoke manufacturing and producing holes in it is performed by cutting sheet material with hydroabrasive jet at feed water pressure of 3800-3900 bar, compressed air for abrasive feed pressure - 4.5-5.0 bar, distance from hydroabrasive unit nozzle to sheet material being cut - 3-5 mm and abrasive material consumption of 650-700 g/min. As abrasive material for jet formation the garnet sand with particle size of 0.16-0.2 mm is used. |
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Invention relates to non-metrical ultrasound processing in fluids and can be used for deburring of small-size parts made of light alloys and polymers with low tensile strength and modulus of elasticity. Parts are dipped in processing fluid including a definite concentration of abrasive solids. Ultrasound vibrations are excited in processing fluid. Abrasive solids represent ice crystals to be continuously fed into processing fluid during processing. Crystal size is set to 0.08-0.18 mm. |
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Abrasive article (versions) and method of sapphire cutting therewith Invention relates to abrasive processing and can be used for wafer slicing of mono- and polycrystalline materials. Abrasive article comprises elongated body, binder ply on its surface and abrasive grains contained on said binder ply with mean concentration of abrasive grains of approx. 0.02 car/m and 0.30 car/m. Invention covers the method of sapphire cutting with the help of aforesaid abrasive article. |
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Device for rolling of coarse thread and worms by rollers Invention relates to metal forming. Proposed device comprises spiked rollers resting on two mid self-locating torus-conical washers. One said washer features bulged conical side with radius R1=3.7 q2m/z, while another washer features recessed conical side with radius R2=1.5 q2m/z, where m is thread or worm profile modulus, q is the ratio of thread profile mean diameter to modulus m, z is the number of thread or worm starts. |
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Surface treatment article and method for production thereof Invention relates to composite abrasives and can be used in polishing or finishing metal surfaces in a wide range. The surface treatment article contains an organic matrix and binder. The binder contains a reaction product of a block polyurethane prepolymer and a mixture of aromatic amines. The aromatic amines include polymethylene polyanilines, characterised by functionality equal to or greater than 4. |
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Machine for application of coat on sections Invention relates to woodwork, particularly, to coat applicators. Proposed machine comprises conveyor path for sections and multiple holders arranged along conveyor part. Said holders retain replaceable pressure rollers to make them roll over the section. Said holders comprise latches of retrievable pressure roll pins. Every said pin comprises bearing part fitted in holder channel. Crosswise channel that enters the holder channel accommodates a lock ball loaded by spring into bearing part recess. Said lock ball is retained in pressure element screwed in said crosswise channel. Bearing part recess is composed by continuous groove in bearing part peripheral part. |
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Appliance for grinding deep bore or pipe inner surface This appliance comprises bar connected with rotary drive and furnished with strip circle secured at its end. Bearing inner race is fixed at said bar while two spring-loaded levers with dampers are arranged at bearing outer race. Small wheels are fitted at the ends of said levers to interact with inner surface, wheels rotational axes being parallel with that of said bar. |
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Method of hardening by surface plastic forming Invention relates to machine building and may be used for surface hardening. Billet is coated with the mix of glycerine with abrasive processing slurry. Billet is rolled by cylindrical roller. Constant radial force is applied to said roller. Said roller reciprocates and fed in lengthwise direction. |
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Electromechanical reconditioning of parts Part surface is upset to make grooves thereon and upset sections are levelled. Circular grooves on part surface feature pitch K=0.5…2 mm to make seal of labyrinth type. Circular grooves upset and upset section levelling are performed synchronously at NC machine. Said NC machine has separate system of tool drives to allow automatic displacement of upset and level tools relative to machined part. Note here that levelling tool is delayed relative to upset tool by magnitude equal to 1-2 steps K between said grooves. |
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Tool assembly and tool for cutting or sawing machine Invention relates to tools for cutting or sawing machine. Tool assembly comprises first tool with shaped disc cutting plate, plate first leading element and second part. note here that the latter comprises either plate second leading element, or second tool including shaped disc cutting plate and second plate leading element. Note here that first tool is locked at second part by central clamp. Note also that every cutting plate comprise central hole formed by central edge and peripheral cutting edge that make the tool working part. Note that leading elements of the plates can rotate along with shape disc cutting plate about rotational axis. At least, one of leading elements comprises peripheral leading surface to interact with endless drive. Every plate leading element comprises central locking part including at least one hole for clamping first leading element at second leading element by central clamp. At least one shaped cutting disc includes at least partially recessed section nearby central hole. Note here the recessed allows locking of shaped cutting disc at appropriate plate leading element by clamping said recessed section axially between main part and plate supporting part of appropriate leading element to make, in fact, a flat outer surface of every tool extension. |
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Composition of polishing instrument with bound abrasive Invention relates to compositions of polishing instrument with bound abrasive for final processing of nonmetallic materials, such as optical glass, crystalline materials, synthetic sapphire, silicon carbide, natural and artificial stones, etc. Composition of polishing instrument contains, wt.p. : caoutchouc, selected from butadiene-nitrile, or mixtures of butadiene-nitrile and butadiene-styrene, butadiene-nitrile and polyurethane, butadiene-nitrile and natural caoutchouc - 100, organic peroxide - 0.5-15.0, polishing powder - 300-800, inorganic or organic salt of alkali metal, selected from chloride or bromide of potassium or potassium phthalate - 10-50. As temporary plasticiser oligoetheracrylates are applied. |
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Composition for impregnation of abrasive tool Proposed composition comprises water solution of ammonium sulphate, ammonium bromide and polyvinyl alcohol at the following ratio of components, wt %: ammonium sulphate - 6-9, ammonium bromide - 3-4, polyvinyl alcohol - 3-5, water making the rest. |
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Method for increasing service life of cylinder of pd-10m double-flow internal combustion engine Invention relates to part restoration industry and can be used at repair of a cylinder of PD-10M double-flow internal combustion engine. Restoration is performed by means of an internal grinding method in two stages on an internal grinding machine with further honed finishing based on additional repair size Dp.p3=74.25+0.030 mm. Rough grinding is performed at the first stage, and finish grinding is performed at the second stage. Processing modes for the above grinding and honed finishing operations are described. |
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Abrasive article (versions) and method of its forming Invention relates to processing by abrasives and may be used for production of composite material machining tools. Abrasive article comprises base and abrasive part including three different bonded phases including abrasive particles, metal matrix and impregnating material. Besides there is the substrate area between abrasive part and base including weld joint. |
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Method of abrading jet surface cleaning of concrete and reinforced concrete structures before repair Invention relates to repair and can be used for cleaning the surface of concrete and reinforced concrete by abrasive means. Surface of concrete and reinforced concrete is processed by abrasive means composed by copper-smelting slags at the pressure of 7 atm for 4.0-5.0 min/m2. Consumption of abrasive equals 8-10 kg/m2 while cleaning rate makes 25-30 m2/h. |
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Invention relates to hand tools. Proposed machine comprises case to accommodate drive motor 8 and fan impeller 9, main inlet 4 and air duct 11 extending from said main inlet 4 by drive motor 8 to fan impeller 9. Case 2 has extra inlet 6 communicated with air duct 11. Said extra hole 6 is arranged along airflow between main inlet 4 and impeller 9 in air intake pipe 7 elevated above case wall and inclined to impeller 12. |
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Invention relates to abrasive tool. Proposed material with binder shaped to abrasive wheel comprises ceramic shaped abrasive particles retained by binder. Every said ceramic particle is confined by polygonal base, polygonal vertex and multiple faces connecting said base and said vertex. Note here that adjacent faces are connected by appropriate ribs with mean radius of curvature smaller than 50 mcm. |
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Installation for shock-vibrating processing of long parts Invention relates to machine building and may be used for finish machining of part surfaces in containers vibrating at low frequency. Proposed installation of container consisting of shells ring with vibrator arranged at the bed and end walls rigidly mounted at said bed. Said end walls have through openings and pockets under bottom at the angle of 35°-55° towards said shell ring composed of helical drum half, said drum being cut in axial line and mounted of multistart helical drum sections. Sections consist of two subsections composed by three and more isosceles trapeziums and isosceles triangles with interconnected lateral sides and bases in subsection are opposed. Said sections are interconnected by larger bases of trapeziums. Said subsections are integrated in section so that isosceles triangle bases of one subsection are connected with top base of isosceles trapeziums of second subsection while isosceles triangle bases of second subsection are connected with top base of isosceles trapeziums of first subsection. |
Another patent 2513833.