Abstract: A joystick control is disclosed for a change speed gearbox having a support body, an axle rotatably supported by the body, an operating lever connected to the axle by a pivot pin having an axis perpendicular to that of the axle such that the operating lever is rotatable about the axis of the axle and is pivotable relative to the axle about the axis of the pivot pin, two actuating members rotatably supported by the axle and arranged one on each side of the operating lever, each actuating member being connectible to a respective Bowden cable to extend and retract the cable in response to rotation of the actuating member about the axle, and mating formations on the operating lever and the actuating members operative to engage the operating lever selectively for rotation with one or the other of the actuating members in dependence upon the direction in which the operating lever is pivoted relative to the axle about the pivot pin.

Abstract: A control device for a crawler vehicle comprises a control lever activated by an operator about a fulcrum and having a free end, the control lever being displaceable along a longitudinal direction of the vehicle between a proximal position closer to the operator and a distal position further from the operator in order to control a main clutch of the vehicle, the control device further comprising a support element suitable for being fixed to a body of the vehicle in order to support an operator's hand when the hand acts on the control lever, the control lever having an intermediate portion interposed between the free end and the fulcrum, the intermediate portion being so shaped as to partially embrace the support element in the proximal position.

Abstract: A control device for a crawler vehicle, comprising a control lever activated by an operator about a fulcrum and having a free end, the control lever being displaceable along a longitudinal direction of the vehicle between a proximal position closer to the operator and a distal position further from the operator in order to control a main clutch of the vehicle, the control device further comprising a support element suitable for being fixed to a body of the vehicle in order to support an operator's hand when the hand acts on the control lever, wherein the control lever has an intermediate portion interposed between the free end and the fulcrum, the intermediate portion being so shaped as to partially embrace the support element in the proximal position.

Abstract: A joystick control is disclosed for a change speed gearbox in which two selector are separately controllable remotely. The joystick control comprises a support body, an axle rotatably supported by the body, and an operating lever connected to the axle by a pivot pin such that the operating lever is rotatable about the axis of the axle in one plane and is pivotable relative to the axle about the axis of the pivot pin in an orthogonal plane. Two actuating members are rotatably supported by the axle and arranged one on each side of the operating lever. Each actuating member is connectable by a respective Bowden cable to one of the selectors of the gearbox and extends and retracts the cable in response to rotation of the actuating member about the axle.

Abstract: An operating mechanism for a Bowden cable comprises a support bracket, an operating lever, a hub mounted on the support bracket for rotation about a first axis by the operating lever, a transmission lever connectable to the Bowden cable and mounted on the support bracket for pivoting about a second axis orthogonal to the first axis, and an actuating arm connected at one end to the hub and connected at its end remote from the huh by a sliding ball and socket joint to the transmission lever so that rotation of the hub about said first axis causes rotation of the transmission lever about the second axis to extend and retract the Bowden cable. In the invention, sliding axis of the ball and socket joint is inclined relative to both the first axis and the second axis.

Abstract: A joystick control is disclosed for a change speed gearbox having a support body, an axle rotatably supported by the body, an operating lever connected to the axle by a pivot pin having an axis perpendicular to that of the axle such that the operating lever is rotatable about the axis of the axle and is pivotable relative to the axle about the axis of the pivot pin, two actuating members rotatably supported by the axle and arranged one on each side of the operating lever, each actuating member being connectible to a respective Bowden cable to extend and retract the cable in response to rotation of the actuating member about the axle, and mating formations on the operating lever and the actuating members operative to engage the operating lever selectively for rotation with one or the other of the actuating members in dependence upon the direction in which the operating lever is pivoted relative to the axle about the pivot pin.

Abstract: A variable pitch fan is provided, which comprises a plurality of blades (2), a supporting device (3) for supporting the blades (2), a rotation device (18) for rotating the supporting device (3) around a rotation axis (X), so that the blades (2) rotate with the supporting device (3) to control an air flow, and an adjusting device for adjusting a pitch of the blades by tilting each blade (2) around a respective tilt axis (Z), the adjusting device comprising a driven element (4) fixed relative to a blade (2). The adjusting device further comprises a mechanical driving element (5) supported by the supporting device (3) so as to rotate with the supporting device (3), the mechanical driving element (5) being linearly displaceable relative to the supporting device (3) and being coupled to the driven element (4) so that a linear motion of the mechanical driving element (5) is converted into a rotary motion of the driven element (4) around the tilt axis (Z).

Abstract: A control device for a crawler vehicle comprises a control lever activated by an operator about a fulcrum and having a free end, the control lever being displaceable along a longitudinal direction of the vehicle between a proximal position closer to the operator and a distal position further from the operator in order to control a main clutch of the vehicle, the control device further comprising a support element suitable for being fixed to a body of the vehicle in order to support an operator's hand when the hand acts on the control lever, the control lever having an intermediate portion interposed between the free end and the fulcrum, the intermediate portion being so shaped as to partially embrace the support element in the proximal position.

Abstract: A control device for a crawler vehicle, comprising a control lever activated by an operator about a fulcrum and having a free end, the control lever being displaceable along a longitudinal direction of the vehicle between a proximal position closer to the operator and a distal position further from the operator in order to control a main clutch of the vehicle, the control device further comprising a support element suitable for being fixed to a body of the vehicle in order to support an operator's hand when the hand acts on the control lever, wherein the control lever has an intermediate portion interposed between the free end and the fulcrum, the intermediate portion being so shaped as to partially embrace the support element in the proximal position.

Abstract: An operating mechanism is disclosed for a Bowden cable which comprises a support bracket, an operating lever, a hub mounted on the support bracket for rotation about a first axis by the operating lever, a transmission lever connectable to the Bowden cable and mounted on the support bracket for pivoting about a second axis orthogonal to the first axis, and an actuating arm connected at one end to the hub and connected at its end remote from the hub by a sliding ball and socket joint to the transmission lever so that rotation of the hub about said first axis causes rotation of the transmission lever about the second axis to extend and retract the Bowden cable. In the invention, sliding axis of the ball and socket joint is inclined relative to both the first axis and the second axis.

Abstract: A joystick control is disclosed for a change speed gearbox in which two selector are separately controllable remotely. The joystick control comprises a support body, an axle rotatably supported by the body, and an operating lever connected to the axle by a pivot pin such that the operating lever is rotatable about the axis of the axle in one plane and is pivotable relative to the axle about the axis of the pivot pin in an orthogonal plane. Two actuating members are rotatably supported by the axle and arranged one on each side of the operating lever. Each actuating member is connectible by a respective Bowden cable to one of the selectors of the gearbox and extends and retracts the cable in response to rotation of the actuating member about the axle.

Abstract: A steering system for an agricultural vehicle with a hydraulic steering motor incorporates an internal pump, a distribution valve, an input shaft which in use is coupled for rotation by the steering shaft of a vehicle steering wheel, and connectors for hydraulic lines leading to a high pressure source of oil, to an oil reservoir and to hydraulic actuators connected to the steerable wheels of the vehicle. The steering motor is located remotely from the steering shaft and is coupled for rotation with shaft by hydraulic rotary actuators mounted on the steering shaft and the input shaft of the steering motor and arranged in a closed circuit with one another.

Abstract: A steering column includes a hollow shaft, a steering shaft, a steering wheel and a joint. The hollow shaft includes an upper section and a lower section, the upper and lower sections being pivotable relative to one another about a pivot axis. The steering shaft includes a first and a second section, each of the first and second sections of the steering shaft being journalled in the upper and lower sections, respectively, of the hollow shaft. The steering wheel is supported on the first section of the steering shaft and the joint interconnects the first and second sections of the steering shaft. The center of the joint is offset from the pivot axis of the upper and lower sections of the hollow shaft.

Abstract: A steering system for an agricultural vehicle with a hydraulic steering motor incorporates an internal pump, a distribution valve, an input shaft which in use is coupled for rotation by the steering shaft of a vehicle steering wheel, and connectors for hydraulic lines leading to a high pressure source of oil, to an oil reservoir and to hydraulic actuators connected to the steerable wheels of the vehicle. The steering motor is located remotely from the steering shaft and is coupled for rotation with shaft by hydraulic rotary actuators mounted on the steering shaft and the input shaft of the steering motor and arranged in a closed circuit with one another.

Abstract: A lever mounted on a support for pivotal movement between two end positions is acted upon by a toggle spring connected at its opposite ends to the lever and the support to bias the lever away from a centre position of unstable equilibrium towards its two end positions. In the invention, instead of using a conventional coil spring, the toggle spring is constructed a leaf spring.

Abstract: A steering column includes a hollow shaft, a steering shaft, a steering wheel and a joint. The hollow shaft includes an upper section and a lower section, the upper and lower sections being pivotable relative to one another about a pivot axis. The steering shaft includes a first and a second section, each of the first and second sections of the steering shaft being journalled in the upper and lower sections, respectively, of the hollow shaft. The steering wheel is supported on the first section of the steering shaft and the joint interconnects the first and second sections of the steering shaft. The center of the joint is offset from the pivot axis of the upper and lower sections of the hollow shaft.

Abstract: A lever mounted on a support for pivotal movement between two end positions is acted upon by a toggle spring connected at its opposite ends to the lever and the support to bias the lever away from a centre position of unstable equilibrium towards its two end positions. In the invention, instead of using a conventional coil spring, the toggle spring is constructed a leaf spring.

Abstract: A vehicle control device, in particular a clutch mechanism for a tractor, includes a control lever and guide mechanism in which the lever is selectively movable from a first rest position to a second engaged position. The control lever is subjected to the action of an elastic apparatus operable to move the lever into the first rest position if the lever is released before reaching a given point along the guide mechanism. The elastic apparatus also being operable to move the control lever into the second engaged position if the control lever is released past the given point.

Abstract: A vehicle control device, in particular a clutch mechanism for a tractor, includes a control lever and guide mechanism in which the lever is selectively movable from a first rest position to a second engaged position. The control lever is subjected to the action of an elastic apparatus operable to move the lever into the first rest position if the lever is released before reaching a given point along the guide mechanism. The elastic apparatus also being operable to move the control lever into the second engaged position if the control lever is released past the given point.

Abstract: A vehicle control device, in particular a clutch mechanism for a tractor, includes a control lever and guide mechanism in which the lever is selectively movable from a first rest position to a second engaged position. The control lever is subjected to the action of an elastic apparatus operable to move the lever into the first rest position if the lever is released before reaching a given point along the guide mechanism. The elastic apparatus also being operable to move the control lever into the second engaged position if the control lever is released past the given point.