Abstract: A device and a method for controlled setting of a coil spring, enabling a coil spring to be blocked in controlled manner with a selected compression length, in particular when compression with touching turns is unfavorable. According to the invention, the device comprises a first support configured to hold the first end of the spring and a second support configured to hold the second end of the spring, the first and second supports being configured to move relative to each other; the device further comprising at least one insertable rest configured to be inserted between certain turns of the spring during compression of the spring.

Abstract: A device and a method for controlled setting of a coil spring, enabling a coil spring to be blocked in controlled manner with a selected compression length, in particular when compression with touching turns is unfavorable. According to the invention, the device comprises a first support configured to hold the first end of the spring and a second support configured to hold the second end of the spring, the first and second supports being configured to move relative to each other; the device further comprising at least one insertable rest configured to be inserted between certain turns of the spring during compression of the spring.

Abstract: A composite material is obtained by mixing with water 100 parts in weight of binder, between 250 and 800 parts in weight of steel-based shot having a granulometric distribution comprised between 120 jim and 3000 jim, between 10 and 15 parts in weight of non-densified silica fume and a highly water-reducing superplasticizer. The ratio between the weight quantity of water and the weight quantity of hydraulic binder is comprised between 0.16 and 0.25. The composite material presents a very high abrasion resistance, an abrasion index measured according to the C.N.R protocol comprised between 0.15 and 1.0, the value of the D10 grain size of the shot being at least eight times greater than the value of the D90 grain size of the hydraulic binder.

Abstract: A thermal quenching installation making use of induction heating. This installation has induction heater means comprising a stationary induction coil, handling means to cause the element to pass through said coil, and cooling means, preferably a shower, disposed downstream from the coil.

Abstract: A vehicle suspension including a subassembly comprising a coil spring mounted between two supports of variable spacing. One of the supports (18) is constrained to move along a trajectory that is curved relative to the other support, and the pitch of an end portion of the corresponding end turn (20a) of the spring (12) varies in a manner that is negative or zero.

Abstract: A composite material is obtained by mixing with water 100 parts in weight of binder, between 250 and 800 parts in weight of steel-based shot having a granulometric distribution comprised between 120 ?m and 3000 ?m, between 10 and 15 parts in weight of non-densified silica fume and a highly water-reducing superplasticizer. The ratio between the weight quantity of water and the weight quantity of hydraulic binder is comprised between 0.16 and 0.25. The composite material presents a very high abrasion resistance, an abrasion index measured according to the C.N.R protocol comprised between 0.15 and 1.0, the value of the D10 grain size of the shot being at least eight times greater than the value of the D90 grain size of the hydraulic binder.

Abstract: A method for fine grinding of mineral particles consists of producing by atomization pellets, made from steel with a high carbon content, or cast iron, with a granular size range less than 15 mm and mixing the pellets with balls, made from steel or cast iron with dimensions between 20 mm and 120 mm, in a rotating grinding mill, the proportion by weight of pellets depending on the granular size of the mineral particles for grinding and the desired reduction ratio.

Abstract: The invention relates to a spring suspension system comprising a helical spring, a sheath, and at least one centering and bearing cup, said spring having an end turn with at least a fraction thereof being covered by said sheath, and which is centered on and bears against said centering and bearing cup. The sheath presents an opening extending around the inner periphery of the sheath and facing towards the spring axis. The fraction of the end turn covered by the sheath is centered on and bears against the centering and bearing cup via spacer means between said sheath and said centering and bearing cup.

Abstract: To make a metal torsion bar having an elongate central body connected to two hexagonal end heads via shoulders, the ends of a torsion bar blank are initially upset while hot so as to form the shoulders of the torsion bar together with cylindrical head blanks, after which each head blank is machined by removing material until the corresponding hexagonal head has been obtained.

Abstract: A method and arrangement of making helical springs from a wire, includes a winding machine for coiling the wire strand to a finished spring. Disposed upstream of the winding machine is a wire gage for measuring a diameter of the wire strand at a predetermined spot of a conical section of the advancing wire strand and producing a control signal commensurate with the registered diameter. The winding machine includes a cutting tool which is actuated in response to the registered control signal, with a new spring coiling cycle being initiated at the same time.

Abstract: A sock for a tie of ballastless rail track that is to be held in a bed of concrete, the sock comprising firstly an elastically deformable case receiving the tie whose bottom edge is chamfered, and secondly a pad lying beneath the tie in the bottom of the case, wherein the bottom portion of the case includes, in its inside wall, recesses guaranteeing compression flexibility thereto even after the wall has been deformed under the effect of hydrostatic pressure from the concrete bed.

Abstract: The invention relates to a device for supporting and wedging a railway rail (R) on a tie (T), the device comprising in particular a resilient pad (1) on which there rests the base (Ra) of the rail (R) and two insulating tabs (2, 2') interposed between the rail (R) and spring clips (A, A') which are fixed on inserts (I, I') secured laterally in the tie (T).According to the invention, said pad (1) comprises a central portion (10) supporting the base (Ra) of the rail (R) and two symmetrical lateral portions (11, 11') of smaller thickness disposed beneath the bottom edges of the tabs (2, 2') which are themselves situated at a level lower than the base (Ra) of the rail (R).

Abstract: Rail support device for unballasted railway track comprising at least one concrete block resting on a flexible base, the assembly being held in an elastomeric shell which is anchored in a bed or mortar covering the lower part of said block, and which has a beading around its top edge. The horizontal cross section of said block is variable and has a maximum area at the level immediately below the beading on the upper edge of the shell so as to limit the relative movement of the block and the shell by means of an elastic force.

Abstract: The invention relates to a metal torsion bar for vehicle suspension, including a straight central part which has a circular cross-section, the central part extending longitudinally between two fixing heads suitable for being rigidly fixed to other mechanical members, the torsion bar being work-hardened by pretwisting and at least the central part of the torsion bar having an annular cross-section. According to the invention, the cross-section of the central part has a radially outside plasticized zone, which has been deformed plastically by the pretwisting, and a radially inside elastic zone, which has been deformed elastically by the pretwisting, the cross-section of the central part of the torsion bar having a total area S and the plasticized zone having an area Sp such that their ratio Sp/S is at least equal to 0.5 and at most equal to 0.6.

Abstract: This invention relates to an insert for fixation of a railway clip comprising an inner conduit, parallel to the rail, intended to receive the rectilinear central portion of the clip, a horizontal rear face on which abuts the rear portion, parallel to the rail, of the clip which is joined to the central portion by a 180.degree. bend and which then extends towards the rail, above the inner conduit, by a substantially perpendicular loop whose end comes into abutment on an insulating stop resting on the base of the rail, wherein the upper face of the insert comprises, towards the inlet orifice of the inner conduit, a retaining boss against which the loop of the clip comes into bearing contact to maintain the clip in a position of equilibrium, where the free end of the central portion is placed in the inlet orifice of the inner conduit.

Abstract: A tool for installing a spring rail fastener includes a main arm whose bottom end is provided with a toe adapted to fit over one of the angled axial ends of the fastener. The main arm is connected near its bottom end, above its toe and by way of a hinge having a transverse pin, to a secondary arm. The secondary arm includes a short first length adapted to be inserted into the housing of an anchoring insert, a second length forming a U-shape bent through 180.degree., a third length that is substantially parallel to the first length and on which the hinge is mounted, and a fourth length extending outwardly and downwardly in inclined manner relative to the third length and terminating in a curved zone.

Abstract: This invention relates to a clip for fastening a rail of a railway on a rail support comprising: a spring clip forming a device for fastening or clamping the rail on a rail support, constituted by a clip made of elastic metal having a first end and a second end and presenting successively, from the first end, a first section forming a substantially rectilinear arm, a second section forming a substantially 180.degree. bend, a third section, a fourth section forming a substantially 180.degree.

Abstract: A method of fixing a rail on a rail-support by metal spikes each comprising a round shaft having a top and terminated by a head for bearing against a rail flange with at least the bottom portion of the spike shaft being received in the rail-support in such a manner that the spike head is directed away from the rail-supporting surface of the rail-support. The bottom portion of the shaft includes at least one zone made of a plastically deformed material, and an antirotation structure is provided co-operating with complementary parts of the rail support for preventing any rotation of the bottom portion of the spike relative to the rail support when a couple below a predetermined value is applied to the top portion of the spike.