Railway brake block

FIELD: railway transport.

SUBSTANCE: invention relates to the railway transport, in particular to brake blocks of the railway transport brakes. Brake block without metal support plate has metal insert containing the main body, two wing-shaped feathers integrated into the main body, located on its opposing sides, digressed wherefrom and having backside surfaces adjacent to the backside surface of the brake block. It also has two mostly parallel feathers spreading in radial direction and integrated into the main body and/or to the wing-shaped feathers. Parallel feathers form the keyway. When the brake block is installed at the brake head the keyway passes through the hole located in the brake head.

EFFECT: invention increases the technical characteristics of the block.

8 cl, 19 dwg

 

Background of invention

The technical field to which the invention relates.

This application relates to the field of composition railway brake blocks.

Description of the prior art,

Rail cars are maintained and forwarded to the steel wheels. The running surface on the outer circumference of the wheels rolling on steel rails. The brakes of a railroad car includes brake pads, which are in frictional adhesion to the surfaces skating wheels. The brake pads are held brake heads, which, in turn, with the possibility of movement hold the brake lever mechanism consisting of a system of levers and pneumatic cylinder. Brake pads consist of different materials, which are selected by their frictional characteristics and effect on the service life of the surfaces skating wheels. Many brake pads are composites made from materials having different characteristics. In a typical composite brake pads materials with different friction characteristics rest on the rolling surface of the wheels during braking. This can be achieved by placing inserts of different materials in the friction surface of the Shoe, consisting of a main material of the brake the heat pads.

Standard rail brake pads in North America is produced with metal backing plates that serve as a support for a friction material, for attaching and holding the brake pads on the brake heads. One type railway brake pads also includes a metal insert as a whole is attached by welding to the metal base plate prior to forming the brake pads, for example, by forming on a support plate. Cm. U.S. patent No. 6241058, entitled "Brake pad with insert, glued to the base plate". Friction material brake pads often contains a mixture of abrasive materials, organic and inorganic fillers and resins. The metal insert may be selected to ensure the best handling of the wheel rolling surface.

In other places in the world the brake pads are produced without metal backing plates, and they usually include skeletal frame. In the result, it is difficult or impossible to obtain benefits from the metal insert from lack of adequate means for supporting and holding the metal insert.

The invention

The advantage of this invention is to provide a metal insert, uniquely configured for use in a brake is ladkah without metal backing plates, and brake pads, including the metal insert. An additional advantage of this invention to provide metal inserts that can be used with the brake pads with a wire framework supports without them.

Brake pads have a friction surface, which during braking rests against the convex rolling surface of the wheels of the rail vehicle. The rolling surface of the wheel is a surface of rotation, which may be convex-conical surface, or a combination of convex-conical and cylindrical surfaces or other surfaces of revolution. The surface of the brake pad has a concave surface of rotation, which corresponds to the portion of the convex surface of the wheel. These surfaces of revolution defined forms (not necessarily a straight line), rotating around the axis formed by the wheel axle. Thus, the friction surface of the brake pads has a generally axial and radial length, and the brake pad has a radial thickness extending from the friction surface. Signs of metal inserts and brake pads corresponding to different variants of implementation of this invention, will be described here with reference to the generally axial, circular and radial directions.

Briefly, according to one the mu variant of implementation of this invention obtained brake pad without the metal base plate. Brake pad formed of a friction surface for the stop in the rolling surface of the wheel and the opposite rear surface to be placed in contact with the brake cylinder, and attach to it. Brake pad has a metal insert that contains a main body having a surface lying in the friction surface of the brake pads. The main body is held in the radial direction from the friction surface and passes to the rear surface of the brake pads. Two cryoablate tabs are integral with the main body of metal inserts, located on its opposite sides and are held in side of her, and also have a back surface that is contiguous with the rear surface of the brake pads. Two generally parallel projection, passing in the radial direction, are in one piece with the main body and/or cilobradine ledges. Parallel projections have dimensions adapted to pass over the back surface of the brake pads, forming the keyway. When the brake pad is installed on the brake head, the keyway passes through the hole in the brake cylinder. The keyway forms the structure for attaching the brake pads to the brake head. A metal insert embedded, for example, by formula the Oia, in the friction material.

According to another variant embodiment of the invention between the radial ends of the parallel ridges of the insertion is the bridge to derive the private key way. According to another variant embodiment of the invention cryoablate ledges and main body have through holes for the passage of the friction material. Thus, the friction material is not interrupted fully insert located between the ends in the circumferential direction (longitudinal direction) brake pads, thus holding both ends connected to each other.

According to another variant of the invention, the brake pad has a wire frame that interacts with a metal insert to create additional resistance to bending and cracking. The wire frame is configured so that a metal insert embedded in the Central part of the wire frame. The wire frame has one end of the fixed part, each of which passes around the circumference (in transverse direction) of the metal insert beyond the length cryoablate protrusions of the metal insert. The wire frame has two short parallel section, which can be placed along the metal insert near kr is Loubressac projections. Short parallel sections connected with attached one end of the sections on the opposite side of the metal insert. Arcuate sections at opposite ends of the metal insert connect a short section and is attached to one end of the section. Arcuate support section attached to one end of the section where they intersect and are welded to each other at their point of intersection. Short sections and curved sections form a slot for the metal insert. A metal insert and a wire frame embedded, for example, by forming the friction material. According to one variant of the invention, the wire frame may be welded to the metal insert.

According to another variant embodiment of the invention, the proposed metal insert for brake pads. Brake pad formed of a friction surface for the stop in the rolling surface of the wheel and the opposite rear surface to be placed in contact with the brake cylinder, and attach to it. The metal insert includes a main body having a friction surface to be placed in frictional surface of the brake pads. The main body is held in the radial direction from the friction surface. Two cryoablate ledge constituting a single C is white with the main body, located on its opposite sides and pass away from him, and also have a back surface to a location adjacent to the rear surface of the brake pads. Two generally parallel, passing in the radial direction of the lip form a single whole with the main body and/or cilobradine ledges. Parallel projections have dimensions adapted to pass over the back surface of the brake pads, forming the keyway.

Brief description of drawings

Other signs and other objectives and advantages of this invention will be apparent from the following description of the preferred variants of its implementation given with reference to the drawings, in which:

figure 1 is a perspective view of a variant of an insert brake pads, corresponding to this invention;

2, 3 and 4 are views in plan, vertical and side view, respectively, of the insert shown in figure 1;

5 is a perspective view of a second variant of an insert brake pads, corresponding to this invention;

6, 7 and 8 in plan, vertical and side view, respectively, of the brake pads, shown in figure 5;

Fig.9 is a perspective view of the third variant of an insert brake pads, corresponding to this invention;

figure 10, 11 and 12 are views in plan, vertical and side stawk the brake pads, shown in Fig.9;

Fig is a perspective view of the insertion brake pads and United with her wire frame to enhance brake pads;

Fig, 15 and 16 species in the plan, vertical and side view of a variant of execution of the brake pads with metal insert, corresponding to this invention;

Fig is a sectional view made along line 17-17 on Fig;

Fig is a sectional view made along line 18-18 in Fig; and

Fig is a sectional view made along line 19-19 on Fig.

Description of the preferred embodiments of the invention

Figure 1-4 shows the insert for brake pads without the metal base plate. Brake pad formed surface friction to stop the rolling surface of the wheel and the opposite rear surface to be placed in contact with the brake cylinder, and attach to it. Metal insert 9 has a main body 10 having a friction surface 11 for the location in the friction surface of the brake pads. The main body 10 is held away from the friction surface. Two wing-shaped protrusion 12, 13 are integrated with the main body, are on opposite sides of the main body and away from him. Cryoablate the projections have a back surface 14 to a location adjacent to the rear surface that is mosney pads and provide support to the brake head. Two generally parallel, passing in the radial direction of the protrusion 15, 16 are integral with the main body 10 and/or cilobradine projections 12, 13. Parallel projections 15, 16 are of such dimensions that they pass over the back surface of the brake pads, thus forming the keyway 17.

Figure 5-8 shows a second variant of the design of metal inserts, corresponding to this invention. In this and subsequent embodiments of the invention such signs have the same reference position. The second variant embodiment of the invention differs from the first by the presence of the bridge 18 between the parallel projections 15, 16 for forming a closed key way.

On Fig.9-12 shows the third embodiment of the metal insert, corresponding to this invention. The third variant embodiment of the invention differs from the first version to have more long cryoablate protrusions 12, 13 and holes 19, 20 in cryoablate the protrusions and the main body for passage of molding material.

On Fig shows a metal insert with the connected wire frame 22. The wire frame is attached to one end of the branches 23, 24, 25 and 26 held in the transverse direction outward from the main body of the insert generally in the plane of the wing-shaped protrusions. Wet and 23 and 24 are connected at the distal ends of the short branch 27. The branches 25 and 26 are connected at the distal ends of the short branch 28. At the proximal ends of the branches 23, 24, 25 and 26 are short branches 29, 30, which is parallel to the projections 15, 16 in the shown design. Short branches 29, 30 are connected with pairs of branches 23, 24, 25 and 26 of arcuate branches 31, 32 (shown in two of the four), which create resistance to rotation of the branches 23, 24, 25 and 26 from the friction surface of the metal insert after the wire frame and the insert embedded in the brake pad. Arched branches support the intersection of different fixed one end of the branches and are welded to each other where they intersect. Short branches and arching branches form a slot for the metal insert.

Now with links to Fig-19 will be described brake pad with embedded metal insert and a wire frame. Brake pad 40 has a friction surface 41 and the rear surface 42. The back surface is shown as cylindrical, and the friction surface - as conical. From the rear surface of the retreat lugs 43 and 44, which are of such size and location that they are in holes in the surface of the brake head (not shown). Also from the back surface recedes protrusion 45 that contains the bracket, which passes through a hole in the surface of the brake the heat of the head and which can be grasped for holding the brake pads relative to the brake head.

Turning to Fig, which is a form of cross-section made perpendicular to the axis of the wheel, you can see how the metal insert 10 and the wire frame 22 are buried in the friction material 50. This is also clear when reading the section views shown in Fig and 19.

Brake pads corresponding to this invention, in a typical embodiment, is formed by molding the friction material around the insert and the wire frame, temporarily held in position in the mold. In one embodiment, the friction material can be added to the mold in one or more stages. Thus, the friction material may vary from the rear side to the friction surfaces. The material of the rear side can be designed to provide rigidity or to obtain strength and rigidity, while the wear of the friction material surface can be another material, selected to obtain the necessary friction characteristics and wear characteristics. Near the rear surface of the brake pads can be embedded reinforcing mesh 52 (see Fig). After forming the friction surface may be subjected to mechanical processing to produce a primary contact for the metal insert, and for frictional the material.

Described herein embodiments of the brake pads with metal insert different resistance to cracking, despite the fact that the metal insert is not supported by the metal support plate. The elimination of the support plate and the welding operation simplifies the manufacture of brake pads without losing the advantages of metal inserts. In some embodiments, application of the invention is even applicable exception to the wire frame.

Thus, after a detailed description of our invention and, in particular, as required by the patent laws, what requires protection by the patent deed, formulated in the following claims.

1. Brake pad, formed of friction material without metal support plate, with the specified brake pad is formed of a friction surface for the stop in the rolling surface of the wheel and the opposite rear surface to be placed in contact with the brake cylinder, and attaching to it, with the specified brake pad has a metal insert that contains a main body having a surface lying in the friction surface of the brake pads, and specified the main body passes in a radial direction away from the friction surface and passes to the said rear surface is rnost brake pads, two cryoablate lugs are integral with the main body, located on its opposite sides and passing away from him, and having a back surface adjacent to the rear surface of the brake pads, and two generally parallel projection, passing in the radial direction and are integral with the main body and/or cilobradine ledges, and these parallel projections are for the back surface of the brake pads, forming the keyway, thus, when the brake pad is installed on the brake head, the keyway passes through the hole in the brake cylinder.

2. Brake pad according to claim 1, in which between the radial ends of the parallel ridges of the insertion is the bridge to derive the private key way.

3. Brake pad according to claim 1, in which cryoablate the tabs and the main body metal inserts have through holes for the passage of the friction material.

4. Brake pad according to claim 1, in which a metal insert embedded in the wire frame, with one end of the fixed part extending from the metal insert for cryoablate tabs.

5. Brake pad according to claim 1, in which is connected a passage passing through each cryoablate the ledge and through the building is the main building of the metal insert, ensuring continuity of the friction material all over the brake pads.

6. Metal insert for brake pads, with the specified brake pad is formed of a friction surface for the stop in the rolling surface of the wheel and the opposite rear surface to be placed in contact with the brake cylinder, and attaching to it, and the specified metal insert includes a main body having a friction surface to be placed in frictional surface of the brake pads, with the specified main body is held in the radial direction from the friction surface, two cryoablate lugs are integral with the main body, located on its opposite sides and retreating from it, and also having a back surface that is positioned adjacent to the rear surface of the brake pads, and two generally parallel, passing in the radial direction of the lip that are integral with the main body and/or cilobradine ledges, and these parallel projections have dimensions adapted to pass over the back surface of the brake pads, forming the keyway.

7. The insert according to claim 6, in which between the radial ends of the parallel ridges of the insertion is the bridge to derive the private key way.

8. The insert according to claim 7, in which cryoablate the tabs have apertures for the passage of molding material.



 

Same patents:

FIELD: machine building.

SUBSTANCE: invention relates to machine building, namely, to friction bake shoe linings of disk brakes. Proposed device comprises moulding material attached to load bearing plate with opposite surfaces, one or several out-of-round extrusion orifices arranged over the plate depth, and ledges or any other fixed mounting ledge. Aforesaid moulding material is arranged above aforesaid opposite surfaces after extruding through aforesaid extrusion orifices to produce a homogeneous structure. In this structure moulding material on one side of load bearing plate acts as friction material of the lining, and, on the other side, it acts as a noise-reducing element. The number, shape and arrangement of extrusion orifices may vary to vary noise-reducing properties of the block, thus, reducing risks of brake system components locking.

EFFECT: improved noise-reducing properties.

49 cl, 8 dwg

Braking block // 2296253

FIELD: automotive industry.

SUBSTANCE: braking block comprises metallic frame and friction lining secured to the frame with a glue. The mass of the glue layer relates to the mass of the friction lining as 1:100-1:150.

EFFECT: enhanced reliability.

Wheeled vehicle // 2273570

FIELD: transport engineering; brake systems of wheeled vehicles.

SUBSTANCE: proposed wheeled vehicle contains brake mechanisms, brake mechanism liquid cooling device, stop signaling electric system and windshield washer including reservoir with liquid, pump and pump drive motor electrically coupled with supply source through switch. Washer is furnished with two-position electromagnetic valve whose input is connected with pump, and normally open output, with washer, and normally closed output, with brake mechanism cooling device through normally-closed electromagnetic valve. Electromagnet of two-position valve is connected to stop signaling circuit, electromagnet of normally-closed valve, to threshold device electrically coupled with supply source and brake mechanism temperature sensor, and switch is furnished with electromagnetic switching drive connected to stop signaling circuit. Friction pads are secured on brake disks, and brake shoes are made hollow, with partitions inside. Input of brake shoe space is hydraulically connected with pump of brake mechanism cooling device, and output, with reservoir with liquid.

EFFECT: improved efficiency of braking and traffic safety.

1 dwg

Friction unit // 2250397

FIELD: mechanical engineering; friction units containing reinforcing metal framework, for example blocks for automobile disk brakes; friction units for various machines and mechanisms.

SUBSTANCE: proposed friction unit has metal framework with holes and friction member molded to it and provided with projections corresponding to holes in framework; projections are received by these holes. Novelty of invention consists in height of projections which is lesser than depth of holes; surface which is not brought in contact with framework inside holes has recesses in at least one of projections. Proposed friction unit enhances resistance of joint of framework with friction member to shear loads.

EFFECT: enhanced resistance to shear loads; reduced mass; low requirements for strength of composite material; facilitated procedure of manufacture.

2 dwg

Friction disc // 2241153
The invention relates to the field of engineering, namely for friction products, and is intended for use as a friction clutch

The invention relates to the brake pads railway rolling stock and can be used in railway transport

The invention relates to the field of transport engineering and is intended for mounting of the friction lining to the support plates in the mechanisms of friction interaction

Friction products // 2200883
The invention relates to the field of engineering, namely for friction products, designed for operation in different friction mechanisms

The invention relates to a transport machine building, and is intended for drum-type brakes

The invention relates to the field of railway transport and for the design of the brake pads of disc brakes

FIELD: railway transport.

SUBSTANCE: invention relates to railway transport, particularly to railway vehicle block brakes. Block brake comprises at least one-layer composite friction element, wire carcass and two solid inserts. Aforesaid wire carcass is pressed in the composite friction material on the block brake rear side. Solid inserts are jointed with the wire carcass. Each of two solid inserts has at least one ledge on the brake rear part, on every side along the insert length. One of the said ledges is arranged in central boss, on both sides from the block center.

EFFECT: higher-efficiency braking, increased durability and longer life.

4 cl, 4 dwg

Friction product // 2361131

FIELD: machine building.

SUBSTANCE: invention relates to friction products, particularly, to blocks and linings of the vehicle disk and drum brakes. The proposed friction product includes a polymer composite friction element with ferromagnetic particles from magnetically soft material. Additionally, it comprises the particles of magnetically hard material with the ratio of magnetically soft-to-magnetically hard particles making from 1:1 to 1.5:1, respectively. As a result, friction properties are improved due to accelerated stabilisation of friction characteristics during initial operation in, primarily, out-of-town conditions. This has been achieved because of constant heating of proposed product during reversal magnetisation under temperatures that cause no fast destruction of friction composite polymer matrix.

EFFECT: improved friction properties.

FIELD: engineering industry.

SUBSTANCE: invention refers to engineering industry, and namely to manufacturing methods of friction items with firm inserts, which are meant for various transport types. Method is realised by hot moulding of shoe from polymer compound in a moulding tool under pressure at simultaneous alignment thereof with metal frame and firm inserts. Hot moulding is carried out in moulding tool with grooves located in a punch that forms the shoe working surface in firm insert location areas. Process projections are formed from polymer friction material on shoe working surface in those zones; then, shoe working surface is machined and process projections are removed, thus providing arrangement of working surfaces of firm inserts and polymer friction material in one plane. Moulding tool used for shoe manufacturing consists of a matrix and upper and lower punches. Punch forming the shoe working surface is equipped with grooves meant for each of the inserts arranged in location areas of firm insert working surfaces. Each groove is bigger than the appropriate insert.

EFFECT: providing the possibility of manufacturing railroad transport means brake shoe and locating working surfaces of firm inserts and working surface of friction material of shoe friction element in one and the same plane, providing efficient operation from the very beginning of brake shoe operation, and minimising the number of expensive friction material waste appearing during machining of shoe working surface.

2 cl, 3 dwg, 4 ex

FIELD: transport.

SUBSTANCE: braking block comprises metal carcass, composite material friction element and two solid inserts arranged symmetrically relative to the block horizontal axis and overlapping its friction part over the width. The said metal carcass represents a wire carcass representing two closed frames press-fitted into the block rear part friction material and perforated tin press-fitted into the block rear part composite friction material. Inner parts of the said frames are partially interoverlapped and bent outwards from the block rear part to form an ear designed to pass the cotter. Rear nonoperating part of every cotter has consoles arranged on each side of the aforesaid inserts all along their length. One of the said consoles is bent towards the block rear surface and arranged in the central boss, the other one being located between the central and auxiliary bosses. Each of the inserts is fitted into one of the wire carcass frames and jammed therein. The inserts, along with the carcass, are pressed in the composite friction material so that the insert console rear surfaces are located in one plate with the perforated tin of the block rear side.

EFFECT: higher durability and safety, longer service life, sable braking capacity and wheel surface recovery in braking.

3 cl, 3 dwg

Stop block // 2345922

FIELD: transport.

SUBSTANCE: stop block contains shoe with handle attached to runner by two rivets. Shoe has groves with antifriction material pressed-in. Groves in shoe may be made as slots in form of dovetail. Inserts may be made of powdered metal consisting of: 8-10 % Fe, 0.6-1 % Al2O3, 3.5-5 % C, 3.5-4.5 % Sn, with remaining part of Cu.

EFFECT: improvement of device performance and avoiding wheel locking.

3 cl, 2 dwg

FIELD: transport.

SUBSTANCE: brake block incorporates a carcass with mounting ledges arranged at the block rear edges, a boss with a central bore designed for fastening inside the shoe. The carcass rear is coated with a steel plate. There are chambers filled with friction elements arranged on the working surface side. The said steel plate represents a plate-like section spring with the ledges fitted under the show points of bearing. There is a corrugated fluoroplastic heat-resistant lining arranged between the steel plate and the carcass. The aforesaid spring and lining are furnished with cuts made opposite the carcass mounting ledges and the boss hole. The aforesaid chambers are divided into cells filled with friction elements. The chambers, cells and friction elements represent truncated pyramids or cones with their smaller base turned towards the carcass working surface and with lateral walls inclined at the angle α=10-15° to form a fixed dovetail joint. The carcass side surfaces feature two openings arranged on both sides opposite the chambers.

EFFECT: reliable and efficient braking at high speed, longer brake block life ensured by elastic interaction between brake block and shoe, reduced noise.

9 cl, 6 dwg

FIELD: transport.

SUBSTANCE: flangeless brake block incorporates a steel plate, a cast iron arc-like body furnished with friction elements arranged on the block friction side. The block body rear side has a boss with a hole receiving a wedge-type cotter. A lateral stop comes from the said boss, its surface representing a tapered surface with inclination of the generating line from the boss top towards the stop of β=30° and getting transformed into triangular reinforcements running perpendicular to the block side surface from its rear side. The block arc-like body main part represents a carcass with the chambers that can be divided into cells housing the friction elements. The chambers, or cells and friction inserts corresponding to them represent truncated pyramids or cones with their smaller bases turned towards the block friction surface and their walls inclined at the angle of α=10° to 15° to form a fixed joint of the dovetail type. The steel plate covering the main section rear side represents a plate shaped spring with ledges arranged under the shoe point of bearing and rests on the stop bulges. A corrugated heat-resistant fluoroplastic lining is arranged between the aforesaid spring and the block body.

EFFECT: reliable and efficient braking in high-speed conditions, longer life and lower noise.

8 cl, 8 dwg

FIELD: transport.

SUBSTANCE: braking block incorporates a steel plate, a black iron arc-like body made up of the main and section parts with a passage made therein and friction elements. The said friction elements are placed in the block main part body on the friction surface side and into the section body part, i.e. in the block passage. The block arc-like body main part represents a carcass with chambers that can be divided into cells to house the friction elements. The chambers, or cells and friction inserts corresponding to them represent truncated pyramids or cones with their smaller bases turned towards the block friction surface and their walls inclined at the angle of α=10° to 15° to form a fixed joint of the dovetail type. The steel plate covering the main section rear side represents a plate shaped spring with ledges arranged under the shoe point of bearing and rests on the stop bulges. A corrugated heat-resistant fluoroplastic lining is arranged between the aforesaid spring and the block body. The section part passage lateral wall is furnished with a truncated-pyramid cavities with their smaller bases facing the block passage friction surfaces, the said cavities housing the appropriate friction elements to form the aforesaid dovetail joint.

EFFECT: reliable and efficient braking in high-speed conditions, longer life and lower noise.

8 cl, 8 dwg

FIELD: machine building.

SUBSTANCE: brake block contains a polymer friction composite material with U-shaped transverse recess made on its working surface. The polymer friction composite material is fixed on a metal frame with U-shaped ledge in its central part. The said composite material incorporates an additional polymer friction element containing 40 to 96% of metal chips pressed in along the perimeter of the U-shaped recess on the working surface.

EFFECT: greater distance run between overhauls of the wheel pair.

2 dwg

FIELD: railway transport; brake systems.

SUBSTANCE: proposed brake shoe contains composite friction member, metal skeleton made of steel strip and hard insert welded to skeleton and arranged in central part of shoe, wire framing, central boss and two side bosses. Wire framing consists essentially of two closed frames press-fitted into composite friction material from rear side of shoe over perimeter of shoe, whose inner parts are relatively overlapped and bent outwards relative to rear part of shoe, thus forming eye to pass cotter pin. Central boss is provided with hole for cotter, pin. Two side bosses are made of composite friction material. Metal skeleton made of steel strip has width less than width of wire framing, being bent to radius of rear surface of shoe and press-fitted into rear surface of shoe between side bosses and under central boss. Composite friction member consists of two longitudinal layers of material. Strength of layer arranged from rear side of shoe is greater than that of layer arranged from working side of shoe.

EFFECT: increased strength of shoe.

2 dwg

FIELD: railway transport; vehicle brakes.

SUBSTANCE: proposed brake shoe of rail vehicle has off-axial conical working surface and cylindrical rear surface. Distance between axis of rotation of rear surface of shoe and working surface is greater than distance between axis of rotation of working surface and shoe working surface.

EFFECT: improved operating characteristic of shoe owing to reduction of possibility of cracking and breaking of edge parts of shoe in operation.

2 dwg

Up!