Abstract: Shoulder support for a motor includes: a back-plate which is adapted for being associated with the back of an operator through shoulder straps and includes a shaped body to contact with the back of the operator to which a frame is fixed, the frame being substantially L-shaped and includes a first portion, fixed to the back-plate, and a second portion undercut with respect to the first portion and comprising a through opening with substantially vertical through axis, the motor being connected at the top the of second portion; a connection body adapted for being rigidly connected to the motor; and a resilient support element adapted for connecting the connection body to the frame in a floating manner inside a seat defined by the through opening. The resilient support element includes a plurality of springs, having axes, which lay on a plane adapted for being arranged transversally to a vertical direction.

Abstract: A two-stroke internal combustion engine includes: a piston-cylinder group defining a combustion and a pumping chamber, the piston mobile in the cylinder between a bottom dead center where the combustion chamber's volume is maximum and the pumping chamber's volume is minimum, and a top dead center, where the combustion chamber's volume is minimum and the pumping chamber's volume is maximum. The engine also includes an intake conduit communicating with the pumping chamber, an exhaust conduit communicating with the combustion chamber, at least a pair of transfer conduits allowing communication between the pumping and combustion chambers, and at least two primary channels in the piston, individually provided with an inlet facing onto the exhaust conduit and an outlet facing on a respective transfer conduit at least when the piston is at the top dead center. A lateral surface of the piston includes a lowering where the primary channels inlets are located.

Abstract: A cutting tool includes: a loop-wound chain wound about at least a drive crown activated in rotation by a motor, a lubricating circuit of the chain provided with a tank of lubricating fluid, a pump drawn by the motor and having an aspirating conduit of the fluid provided with an aspirating mouth located internally of the tank, and a delivery conduit provided with an outlet mouth located in proximity of the chain, a sensor able to detect the lubricating fluid in the lubricating circuit.

Abstract: A method for controlling the operation of a spark ignition internal combustion engine is described. The engine includes: a combustion chamber, an intake duct for placing the combustion chamber in communication with the external, a throttle valve arranged inside the intake duct, a carburetor for introducing fuel into the intake duct to form an air/fuel mixture to be intaken into the combustion chamber, and a spark plug arranged inside the combustion chamber to generate a spark for igniting the combustion of the air/fuel mixture. The method includes: monitoring the opening degree of the throttle valve; monitoring the speed of the engine, preventing the spark plug from generating the spark, if the opening degree of the throttle valve drops below a first opening degree threshold value and the speed of the engine is greater than a first engine speed threshold value.

Abstract: Herein described is a two-stroke internal combustion engine (100), comprising: a cylinder (135) having a pre-set central axis (B); a piston (145) slidably coupled to the cylinder (135) and suitable to divide the interior volume thereof into two distinct chambers, including a combustion chamber (150) and a pumping chamber (155); an intake duct (160) communicating with the pumping chamber (155); an exhaust duct (170) communicating with the combustion chamber (150); and at least one scavenging duct (180) suitable to place the pumping chamber (155) in communication with the combustion chamber (150); wherein said scavenging duct (180) comprises a terminal portion (190) leading to the combustion chamber (150) which extends with configuration diverging from an inlet section (200) up to an outlet section (205) obtained on a lateral surface of the cylinder (135).

Abstract: A control system for carburation of an internal combustion engine in use conditions comprising following activities: starting the engine with a value of ? equals ?0=?T; constructing a curve ci(?) of the ionization current ? as a function of the angular position a of the crank shaft; selecting, on this curve ci(?), a number of points at intervals ?? of the rotation angle a; calculating value z, equal to integral from 0 to 360° of the curve ci(?), is done by summing products ??×ci for all preselected points; interrupting supply of fuel for some cycles in order to externally modify factor ?0 and take it to value ?1; for value ?1 constructing curve ci(?) and calculating value z1; calculating difference ?z=z1?z0, and if the difference is >?zref in absolute value, intervening on carburation by increasing the quantity of fuel injected in a case of a positive difference (lean mixture) and by reducing the quantity of fuel injected in a case of a negative difference (rich mixture).

Abstract: System for controlling the carburetion of an internal combustion engine comprising the following activities: a) starting the engine; b) determining the factor ?o using any known method; c) measuring the ionization current cio; d) modifying—from outside—the factor ? by a predefined amount equivalent to ?? bringing it to the value ?1=?o+??; e) repeating the measurement of the ionization current ci1; f) calculating the value of the difference of the ionization current A?ci1 equivalent to cio?Ci1; g) repeating operations d. and e. until the difference between the last value of the ionization current o,? and the second last value cin-1 is smaller than ?ci; where ?ci is a predefined value which is assumed to have no influence with respect to the carburetion.

Abstract: A purifying system for combustive air in an internal combustion engine is provided. The system includes an intake conduit of combustive air into the engine, a discharge conduit of the exhaust gases produced by the engine, and a cyclone separator associated to the intake conduit and provided with a collecting tank of detritus, a link conduit which has a greater diameter than the discharge conduit and which is inserted on at least a terminal tract of the discharge conduit, such that a hollow space is defined between the terminal tract and the link conduit, and a connecting conduit destined to connect the collecting tank with the hollow space by flowing into the link conduit upstream of an end of the discharge conduit with respect to an outflow of the exhaust gases.

Abstract: System for controlling the carburetion of an internal combustion engine comprising the following activities: a) starting the engine; b) determining the factor ?o using any known method; c)measuring the ionization current cio; d) modifying—from outside—the factor ? by a predefined amount equivalent to ?? bringing it to the value ?1=?o+??; e) repeating the measurement of the ionization current ci1; f) calculating the value of the difference of the ionization current A?ci1 equivalent to cio-Ci1; g) repeating operations d. and e. until the difference between the last value of the ionization current o, ? and the second last value cin-1 is smaller than ?ci; where ?ci is a predefined value which is assumed to have no influence with respect to the carburetion.

Abstract: A purifying system for combustive air in an internal combustion engine is provided. The system includes an intake conduit of combustive air into the engine, a discharge conduit of the exhaust gases produced by the engine, and a cyclone separator associated to the intake conduit and provided with a collecting tank of detritus, a link conduit which has a greater diameter than the discharge conduit and which is inserted on at least a terminal tract of the discharge conduit, such that a hollow space is defined between the terminal tract and the link conduit, and a connecting conduit destined to connect the collecting tank with the hollow space by flowing into the link conduit upstream of an end of the discharge conduit with respect to an outflow of the exhaust gases.

Abstract: A device for supplying an internal combustion engine (1), comprising a carburettor (72) and an air filter (71) installed on an air intake line (70), through which the air filtered by the filter (71) is conveyed into the carburettor (72), and an anti-backflow element (8) located in series on the air intake line (70) between the carburettor (72) and the air filter (71), in which the anti-backflow element (8) exhibits an external casing (80) comprising a perimetral band (81) including at least a portion substantially circular in development closed by two side walls (82, 83), such as to internally define at least a compartment (84) in communication with the carburettor (72) through a duct (85) opening in the perimetral band (81) and developing tangentially relative to the circularly developing portion, the compartment (84) also in communication with the air filter (71) through a first duct (86) opening in one of the side walls (82, 83).

Abstract: A two-stroke internal combustion engine is provided and includes a casing, a cylinder, a piston skirt, an aspirating port, a carburetor which supplies the casing with an air/fuel mixture, through said aspirating port, a transfer conduit which opens into the cylinder through an air/fuel inlet port, and a fuel storage system, or resonance tube which communicates with a first port located above the aspirating port, and with a second port located below the aspirating port. The first port and the second port are alternatingly opened by the piston skirt, which includes a through-hole having a diameter between 0.5 and 3.0 mm. The through-hole being located, when the piston is mounted in the engine, in a same radial plane as the second port.

Abstract: A fuel injection system for a two-stroke internal combustion engine (1), elastically housed internally of a chamber, comprises a carburetor (30) to which are associated an induction port (9) for an air/fuel mixture and a fuel supply conduit (10) intercepted by means for metering housed in a recess (16) communicating with a second aperture (15) located above the induction port (9), which is in turn connected by an accumulation conduit (12) to a first aperture (14) located below the induction port (9), the apertures (14, 15) being alternatively opened by the piston skirt (3); the accumulation conduit is entirely afforded in the cylinder body.

Abstract: A suction device for cleaning jobs comprising a bladed impeller (1) actuated by a motor and suitable for being housed inside a carcass provided with an inlet opening for an airflow and an outlet opening, where said impeller (1) comprises a first series of blades (2) and a second series of blades (3), which rotate firmly fixed together, coaxial to each other and distributed in a staggered manner, suitable for respectively generating an axial flow and a radial flow, said second series of blades (3) being arranged downstream of the first series of blades (2), with respect to the inlet opening, so that the air sucked in is transmitted from the first series of blades (2) to the second series of blades (3) before it reaches the outlet opening.

Abstract: An engagement system for removably connecting gardening tools and similar type devices to a power unit comprising a drive motor, the system comprising a base element suitable for being fixed to a crankcase housing the drive motor, a fastening element of a tool that can be actuated by a shaft of the drive motor, suitable for coupling with the base element, a button mounted on the base element and suitable for cooperating with a corresponding opening formed on the fastening element to removably lock the elements in an engagement position, the base element being equipped with at least one electrical safety switch actuated elastically by a rod between a first position in which the electrical safety switch is closed and prevents the operation of the drive motor, and a second position in which the electrical safety switch is open and allows the operation of the drive motor, the second position only being obtainable when the fastening element is engaged with the base element.

Abstract: A fuel injection system for a two-stroke internal combustion engine (1) elastically housed in a compartment and comprising a carburettor (30) with which there are associated an induction port (9) for the air/fuel mixture and a fuel feed conduit (10) intercepted by dispenser means fixed to a fuel accumulation system (25) communicating with a first aperture (14) positioned below the induction port (9) and with a second aperture (15) positioned above the induction port (9), said apertures (14, 15) being alternately opened by the skirt of the piston (3), said system comprising a non heat-conducting elastic intake header (22) positioned between the carburettor (30) fixed to the wall (40) of the compartment housing the engine (1) and the feel dispenser means fixed to the fuel accumulation system (25).

Abstract: A portable motorized device (1) for gardening tools having a crankcase (2), a motor (3) housed in the crankcase (2), a drive shaft (4) associated with the motor (4) and suitable for actuating a tool, control device (7) of the motor (3), where said crankcase (2) comprises two hollow substantially symmetrical portions (2a, 2b) divided vertically along a plane parallel to the rotation axis of the drive shaft (4), a grip (5; 55) with which control device (7) of the motor are associated.

Abstract: A diaphragm carburetor (1) for internal combustion engines includes a carburetor body (2,2?) provided with a feed duct (3) of an air/fuel mixture to the engine, the duct (3) being intercepted by at least one butterfly valve (20); a pumping device including a diaphragm pump (6) communicating on one side with the engine and on the other side with a fuel tank, the diaphragm pump (6) being driven by the pulses corning from the engine; a metering device including a diaphragm meter (7) adapted to keep a first chamber (13) and a second chamber (12) separate, with the meter (7) interposed, the first chamber (13) being at environmental pressure, and the second chamber (12) communicating both with the diaphragm pump (6), on the side which communicates with the tank, through a line intercepted by a valve controlled by the meter (7) itself, and with the feed duct (3) of the mixture, where the pumping device and the metering device are integrally made on a single block (5) fixed directly on one side of the carburetor b

Abstract: A fuel injection system for a two-stroke internal combustion engine (1), elastically housed internally of a chamber, comprises a carburettor (30) to which are associated an induction port (9) for an air/fuel mixture and a fuel supply conduit (10) intercepted by means for metering housed in a recess (16) communicating with a second aperture (15) located above the induction port (9), which is in turn connected by an accumulation conduit (12) to a first aperture (14) located below the induction port (9), the apertures (14, 15) being alternatively opened by the piston skirt (3); the accumulation conduit is entirely afforded in the cylinder body.