Abstract: An impact wrench has a casing accommodating rotatable anvil and shaft, the shaft supporting a hammer having a body with longitudinally extending passages in which pins are received for axial reciprocations which pins are engaged with the anvil in one position. A driving member received in an axial passage of the hammer body is coupled to the shaft to perform rotation and axial movement, the driving member being connected to the hammer body for rotation together therewith, and cooperating with a spring for moving the pins into a position, in which they are engaged with the anvil. The longitudinally extending passages open into the axial passage of the hammer body. Each pin has a bearing surface engageable with a respective bearing surface of the driving member during movement of the pins into the other position, the bearing surface being located on a portion of each pin protruding into the axial passage of the hammer body.

Abstract: A contrivance for the cutting-deforming of cylindrical surfaces comprises a housing wherein are installed in succession a head with at least two deforming rollers and a tool-holder adapted for movement in a plane perpendicular to the direction of a longitudinal feed. The tool-holder has an opening for passing a workpiece to be machined and accommodates a main pair of cutting tools and at least one additional pair of cutting tools. The cutting tools of the main pair are disposed oppositely in relation to a cylindrical surface under machining and in one plane with the deforming rollers. The deforming rollers are disposed relative to the cutting tools of the additional pair at a distance not multiple of a distance between the main and additional pairs of cutting tools equal to 0.1-1.5 of the value of a set-up size of the cutting tools of the main pair.

Abstract: A method for measuring the amplitude of mechanical vibrations comprises the application of a measuring sign in the form of a measuring circle to the surface of the vibrating object, the radius of said measuring circle being of any length selected out of the range of measured values. Each measuring sign vibrating jointly with the object forms a figure of its own and the vibration amplitude of the object is measured along the radius of that particular measuring circle whose visually percepted parts are in contact in the center of the figure formed by said circle.

Abstract: A hand-held fastening element driving tool comprising a body accommodating a reciprocating actuator. The body carries a barrel wherein a striker is movable. The barrel holds a fastening element magazine. The striker consists of two parts closely fitted to each other. One part is a rectangular member whose cross-section follows the contour of a staple-shaped fastening element. The other member, together with the rectangular member, forms a figure circumscribing the head of a stem-shaped fastening element. The barrel cross-section is made as to suit the shape of the striker.

Abstract: A process for preparing a powder-like iron-sodium tartrate complex useful for the preparation of a solvent for cellulose which comprises reacting a salt of trivalent iron with sodium tartrate or primary sodium tartrate or a mixture thereof in an aqueous medium at a molar ratio of said reactants of 1:3.0-3.3 respectively, a concentration of the salt of trivalent iron of 0.5-0.7 mole/l of the starting reaction mixture and at a pH of the reaction mixture of 0.8-5.5 with the formation of a reaction mass containing the desired product; the latter is precipitated from the reaction mass by means of a precipitation agent such as methanol, ethanol, propanol or acetone at a volume ratio of the precipitation agent to the reaction mass of 0.7-1.5:1.0 respectively with the formation of a precipitate of the desired product and a mother liquor; the precipitate of the desired product is separated from the mother liquor and dried at a temperature of from 30.degree. to 105.degree. C.

Abstract: A hydraulically-assisted power steering assembly comprises a housing of a fluid distributor having arranged therein a control valve the central bore of which receives a steering shaft, and a servohydraulic actuator; the steering shaft, servohydraulic actuator and control valve being kinematically linked for the control valve to be capable of axial displacement when the steering shaft is turned. The kinematical linkage includes a tubular sleeve disposed inside the central bore of the control valve to rotate raltive thereto and to be fixed thereto in the axial direction, one end of the sleeve being connected to the steering shaft by way of a screw transmission.

Abstract: There is provided a method wherein the source material, rubber or vulcanization products is pulverized in an extruder wherein it is first compressed by a force of 0.2 to 0.7 MPa, then subjected simultaneously to a pressure ranging from 0.2 to 50 MPa and a shear force ranging from 0.03 to 5 N/mm.sup.2 while heating the material to a temperature ranging from 80.degree. to 250.degree. C. and then cooling said material to a temperature ranging from 15.degree. to 60.degree. C. The source materials can be used rubber goods, such as used tires and rejects of tire industry, footwear and industrial rubber production.

Abstract: A torch for gas-shielded arc welding in a deep narrow groove comprises a current contact torch bit (1) with an electrode (2) and a nozzle for supplying the shielding gas to the welding zone, which communicates with a gas-feeding tube (4) and is provided with at least one row of horizontally arranged holes (5). The nozzle is a closed chamber (3) made as a symmetrical wedge whose sharp edge faces the electrode (2) and is in one plane with the axis thereof. The side walls and bottom of the chamber (3) feature at least one additional row of holes (6) whose axes lie in one plane approximately perpendicular to the walls (7) of the groove.The torch is designed primarily for welding of very thick workpieces.

Abstract: An apparatus for gas-shielded arc welding comprises a mechanism (1) for guiding and feeding an electrode to a welding zone (3), a nozzle (4) for feeding a protective gas medium to the welding zone (3) and a TV transmission camera (6) for realtime monitoring of the welding process. A cover plate (8) made of an optically transparent material is provided at the end (7) of the gas nozzle (4) which is remote from the welding zone (3), and a lens (9) of the TV camera (6) is installed above the cover plate (8) coaxially therewith. The distance ("a") from the cover plate (8) to the lens (9) is selected in such a manner that the zone (3) of sharpness of the lens is located beyond the edge (11) of the gas nozzle (4) which is adjacent to the welding zone (10) and extends over the components of the welding process.An apparatus for gas-shielded arc welding is designed preferably for welding thick plate materials, for example, pressure vessel casings.

Abstract: The burner for metallurgical furnaces comprises a main combustion chamber (7) and an auxiliary combustion chamber (5) presenting a plurality of outlet channels (6) communicating with the main combustion chamber (7). To the main combustion chamber there is fed in a pulsating manner a primary mix of fuel gas and air in stoichiometric ratio, and, during the intervals between the feed pulses, a secondary mix of fuel gas and air with a coefficient of excess air of 1.15 to 1.35 and at a rate of flow corresponding to 1 to 3% of the nominal rate of flow. To the auxiliary combustion chamber (5) there is instead continuously fed an auxiliary mix of fuel gas and air with a coefficient of excess air of 0.65 to 0.85 and at a rate of flow corresponding to 1 to 3% of the rate of flow of the primary mix. The combustion products of the auxiliary mix stay in the auxiliary combustion chamber (5) for a very short time, more particularly for about from 0.005 to 0.01 sec.

Abstract: Disclosed is a trenching machine comprising a vehicle of a tractor type, a drive mechanism, a spoil discharge conveyor assembly, and a digging apparatus including a boom connected with its one end to the vehicle, a power means for raising and lowering the boom, a guide means mounted on the boom, a carrying means moving along the guide means, teeth mounted on the carrying means along alternate first cutting lines and second cutting lines in the direction of movement of the carrying means, the number of the teeth mounted along the first cutting lines being greater than that of the teeth mounted along the first cutting lines across the width of the carrying means being greater than the width of the teeth mounted along the secod cutting lines.

Abstract: Disclosed is a flux intended for use in centrifugal casting of bimetallic pipes and comprising calcium oxide, silicon oxide, boron oxide, sodium oxide and sodium fluoride, said components being contained therein in the following amounts:Percent by weightCaO, the baseSiO.sub.2 : . . 7 to 10B.sub.2 O.sub.3 . . . 10 to 12Na.sub.2 O . . . 18 to 24NaF . . .

Abstract: An inductive transducer intended, according to the invention, for converting the displacement of mechanical objects into an electric signal, comprising primary and secondary coils with cores, connected to one of mutually moving mechanical objects. The coils are arranged one opposite the other with a gap, wherein a main screen connected to the other moving object and at least one auxiliary screen are located. The auxiliary screen is set movably in a plane parallel to the main screen. The inductive transducer of this invention permits obtaining a functional relationship between the output signal and two or more displacements of mechanical objects, and thereby enables the relationship, including the slope thereof, to be controlled by simple means.