Abstract: A transmission device includes a drive shaft and two driven shafts. The drive shaft is connected to a wheel and first engagement rotors are arranged therebeside so that the wheel is located therebetween and can rotate together with them. The first engagement rotors having an axial hole in which a driven shaft is rotatably arranged, the first engagement rotors are coupled or uncoupled with second engagement rotors coaxially arranged therebeside, by extracting or retracting, respectively, at least one mobile tooth rotatable in a seat of the first engagement rotors, each driven shaft being keyed to a second engagement rotor. Driving rotors are arranged around the driven shafts between the wheel and the first engagement rotors and are provided with a brake, so that relative rotation of the driving rotors with respect to the first engagement rotors causes extension or retraction of the mobile tooth according to the relative rotation direction.

Abstract: A transmission device includes a drive shaft and two driven shafts. The drive shaft is connected to a wheel and first engagement rotors are arranged therebeside so that the wheel is located therebetween and can rotate together with them. The first engagement rotors having an axial hole in which a driven shaft is rotatably arranged, the first engagement rotors are coupled or uncoupled with second engagement rotors coaxially arranged therebeside, by extracting or retracting, respectively, at least one mobile tooth rotatable in a seat of the first engagement rotors, each driven shaft being keyed to a second engagement rotor. Driving rotors are arranged around the driven shafts between the wheel and the first engagement rotors and are provided with a brake, so that relative rotation of the driving rotors with respect to the first engagement rotors causes extension or retraction of the mobile tooth according to the relative rotation direction.

Abstract: A transmission device for two or more shafts is provided having two first cylindrical sleeves which are connected to the first shaft and can be mechanically coupled or uncoupled with two second cylindrical sleeves connected to the second shaft or to a third shaft aligned with the second shaft, by tightening or loosening, respectively, two helical springs arranged in a substantially coaxial manner astride these cylindrical sleeves. Two control collars are mechanically coupled with two tubular members, so that the mutual translation of the control collars with respect to the tubular members also causes their mutual rotation, the ends of the helical springs being arranged into seats made in the control collars and in the tubular members so that their mutual rotation tightens or loosens the coils of the helical springs, thereby causing the coupling or the uncoupling, respectively, between the first cylindrical sleeves and the second cylindrical sleeves.

Abstract: Device suitable for transmitting a torque from a first shaft (5) to at least one second shaft (6), wherein the first shaft (5) is mechanically connected to a first cylindrical sleeve (12) which can be mechanically coupled or uncoupled with a second sleeve (13) mechanically connected to the second shaft (6) and arranged in a coaxial way around the first sleeve (12), by extracting or retracting, respectively, a mobile tooth (14) which can rotate in a seat made in the first sleeve (12), a third sleeve (18) being arranged in a coaxial and rotating manner around the first sleeve (12) and being provided with braking means (19; 25), wherein the mobile tooth (14) is provided with a cursor (21) suitable for sliding in a substantially radial manner in a groove (22) made in the third sleeve (18), so that the relative rotation of the third sleeve (18) with respect to the first sleeve (12) causes the extension or the retraction of the mobile tooth (14) according to the direction of this relative rotation.

Abstract: A transmission device for two or more shafts is provided having two first cylindrical sleeves which are connected to the first shaft and can be mechanically coupled or uncoupled with two second cylindrical sleeves connected to the second shaft or to a third shaft aligned with the second shaft, by tightening or loosening, respectively, two helical springs arranged in a substantially coaxial manner astride these cylindrical sleeves. Two control collars are mechanically coupled with two tubular members, so that the mutual translation of the control collars with respect to the tubular members also causes their mutual rotation, the ends of the helical springs being arranged into seats made in the control collars and in the tubular members so that their mutual rotation tightens or loosens the coils of the helical springs, thereby causing the coupling or the uncoupling, respectively, between the first cylindrical sleeves and the second cylindrical sleeves.