Abstract: A device (9) for protecting a direct current electrical system (1) having one or more modules (2) from electric arcs comprises: a first sensor (10) provided with a first ring of ferromagnetic material configured to generate a first signal, representing a oscillating component of a current flowing through a cable inserted into the ring; a conditioning stage (12), having a bandpass filter, for conditioning the first signal; a first threshold comparator (13); a counter (15); a processor (14); a second sensor (19), configured to generate a second signal representing a direct current component of the current flowing through the cable; a second threshold comparator (20).

Abstract: The system comprises a pyrolysis chamber having a tire carcass inlet port and communicating with at least a duct for supplying combustion air, the pyrolysis chamber further communicating with s steam generator and having a stationary bottom of frustum of cone shaped coaxially communicating with the combustion air duct, rotating arm members being moreover provided, associated with the stationary bottom, adapted to cause waste unburnt material to be discharged from an outlet port formed through the stationary bottom.

Abstract: The apparatus comprises a pair of calibrating rollers, rotating in opposite directions, therebetween a pre-extruded rubber profiled member may be inserted having a undefined cross-section, a driving kinematic link being further provided for driving both the calibrating rollers with the same peripheric speed.

Abstract: A machine for retreading worn-out pneumatic tires comprises a chuck which is adapted to support a tire to be retreaded, an arrangement for rotating the tire, a peeling arrangement for removing the worn-out tread, a finishing arrangement for preparing the surface of the carcass for application of a new tread ring thereto, an arrangement for expanding the new ring and positioning the same on the carcass, and an arrangement for pressing the positioned tread ring against the tire, all of the arrangements being mounted on a common support with said chuck either axially or radially of the same for selective sequential movement toward and away from the tire to be retreaded.

Abstract: A machine to perform in one single operating cycle the molding and curing of tread rings for pneumatic tires, including a central drum rotating around its own axis and translatable about itself, surrounded by a stationary annular carrying structure, carrying radially a plurality of hydraulic or pneumatic double acting cylinders, each rod of the said cylinders being provided at its end turned towards the drum with a mold carrying platen to which there is fixedly secured the mold which is part of a complete annular form and which is part of a complete annular form and which may radially translate with synchronous movement, either going near or away from the surface of the said central drum.

Abstract: A mould for curing covered pneumatic tires, includes a tubular drum, provided with an intermediate partition wall subdividing the interior of the drum into two chambers having annular configurations which are internally bounded by a tubular member having axial length substantially equal to that of the drum, each of the chambers being closed by a door hinged to said drum and having an annular interior recess configuration.