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A set of swashplates having a non-rotary swashplate and a rotary swashplate. The set includes drive means constraining the rotary swashplate and the rotor mast in rotation about the axis of rotation. The drive means are provided with a drive arm driving the rotary swashplate in rotation about the ax

A set of swashplates having a non-rotary swashplate and a rotary swashplate. The set includes drive means constraining the rotary swashplate and the rotor mast in rotation about the axis of rotation. The drive means are provided with a drive arm driving the rotary swashplate in rotation about the axis of rotation by plane connection means including a fork, the drive arm extending in elevation from a first end to a second end that is fastened to the rotor mast, the first portion being held captive laterally between two lateral branches of the fork, the fork being hinged to the rotary swashplate by movement means giving the rotary swashplate a degree of freedom to move in rotation about a radial direction of the rotary swashplate relative to the fork.

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1. A set of swashplates for controlling the pitch of blades of a rotor, the set being provided with a non-rotary swashplate held against any rotation about an axis of rotation and a rotary swashplate suitable for rotating about the axis of rotation, the set including drive means for constraining the

1. A set of swashplates for controlling the pitch of blades of a rotor, the set being provided with a non-rotary swashplate held against any rotation about an axis of rotation and a rotary swashplate suitable for rotating about the axis of rotation, the set including drive means for constraining the rotary swashplate and a rotor mast of the rotor in rotation about the axis of rotation, the drive means being provided with a drive arm driving rotation of the rotary swashplate about the axis of rotation, the drive arm extending in elevation from a first end towards a second end that is to be fastened to a rotor mast, wherein the drive arm drives rotation of the rotary swashplate about the axis of rotation by means of a plane connection including a fork, the first portion being held captive laterally between two lateral branches of the fork, the fork being hinged to the rotary swashplate giving the rotary swashplate a degree of freedom to move in rotation about a radial direction of the rotary swashplate relative to the fork, wherein the drive arm includes a first end portion that is substantially vertical, forming the first end, followed by a rounded intermediate portion having a radius, and a second end portion that is substantially horizontal and forming the second end, the second end portion comprising a ring for engaging around the rotor mast. 2. The set of swashplates according to claim 1, wherein the fork is U-shaped, having an end wall carrying the two branches, the end wall being connected to the rotary swashplate. 3. The set of swashplates according to claim 2, wherein the fork is hinged to the rotary swashplate by movement means comprising a pivot shaft secured to the end wall, the pivot shaft penetrating into a reception orifice of the rotary swashplate. 4. The set of swashplates according to claim 3, wherein the movement means further comprise a shouldered ring or a bearing system interposed between the pivot shaft and the rotary swashplate. 5. The set of swashplates according to claim 1, wherein at least one of the branches has an inside surface facilitating movement in translation of the fork along the drive arm. 6. The set of swashplates according to claim 5, wherein the inside surface of the at least one of the branches is provided with slide means comprising at least one roller carried by at least one branch for facilitating movement in translation of the fork along the drive arm. 7. The set of swashplates according to claim 1, wherein at least one of two branches comprises a movable wall that is movable relative to the other branch forming a movable stop to enable the drive arm to be continuously clamped in the fork between the branches. 8. The set of swashplates according to claim 1, wherein the fork includes an end wall connected to the rotary swashplate, at least one of the branches comprising a movable wall sliding laterally along the end wall. 9. The set of swashplates according to claim 8, wherein the fork includes a spring member interposed between the movable wall and a shoulder of the end wall in order to move the movable wall against an edge face of the drive arm. 10. The set of swashplates according to claim 1, wherein the first end portion of the drive arm extends transversely from a first edge face to a second edge face over a constant width between the branches. 11. A rotorcraft rotor provided with a rotor mast driving a plurality of blades in rotation about an axis of rotation, the rotor including a set of swashplates for controlling the pitch of the blades, the set of swashplates is comprising a non-rotary swashplate retained against any rotation about the axis of rotation and a rotary swashplate suitable for rotating about the axis of rotation, the set of swashplates including drive means constraining the rotary swashplate and the rotor mast in rotation about the axis of rotation, wherein the set of swashplates is a set according to claim 1, the second end of the drive arm being secured to the rotor mast. 12. An aircraft, wherein the aircraft includes a rotor according to claim 11. 13. A set of swashplates for controlling the pitch of blades of a rotor, the set being provided with a non-rotary swashplate held against any rotation about an axis of rotation and a rotary swashplate suitable for rotating about the axis of rotation, the set including drive means for constraining the rotary swashplate and a rotor mast of the rotor in rotation about the axis of rotation, the drive means being provided with a drive arm driving rotation of the rotary swashplate about the axis of rotation, the drive arm extending in elevation from a first end towards a second end that is to be fastened to a rotor mast, wherein the drive arm drives rotation of the rotary swashplate about the axis of rotation by means of a plane connection including a fork, the first portion being held captive laterally between two lateral branches of the fork, the fork being hinged to the rotary swashplate giving the rotary swashplate a degree of freedom to move in rotation about a radial direction of the rotary swashplate relative to the fork, wherein at least one of the branches has an inside surface facilitating movement in translation of the fork along the drive arm. 14. The set of swashplates according to claim 13, wherein the inside surface of the at least one of the branches is provided with slide means comprising at least one roller carried by at least one branch for facilitating movement in translation of the fork along the drive arm. 15. The set of swashplates according to claim 14, wherein the fork is U-shaped, having an end wall carrying the two branches, the end wall being connected to the rotary swashplate. 16. The set of swashplates according to claim 15, wherein the fork is hinged to the rotary swashplate by movement means comprising a pivot shaft secured to the end wall, the pivot shaft penetrating into a reception orifice of the rotary swashplate. 17. The set of swashplates according to claim 16, wherein the movement means further comprise a shouldered ring or a bearing system interposed between the pivot shaft and the rotary swashplate. 18. The set of swashplates according to claim 15, wherein the drive arm includes a first end portion that is substantially vertical, forming the first end, followed by a rounded intermediate portion having a radius, and a second end portion that is substantially horizontal and forming the second end, the second end portion comprising a ring for engaging around the rotor mast. 19. The set of swashplates according to claim 13, wherein at least one of two branches comprises a movable wall that is movable relative to the other branch forming a movable stop to enable the drive arm to be continuously clamped in the fork between the branches. 20. A rotorcraft rotor provided with a rotor mast driving a plurality of blades in rotation about an axis of rotation, the rotor including a set of swashplates for controlling the pitch of the blades, the set of swashplates comprising a non-rotary swashplate retained against any rotation about the axis of rotation and a rotary swashplate suitable for rotating about the axis of rotation, the set of swashplates including drive means constraining the rotary swashplate and the rotor mast in rotation about the axis of rotation, the drive arm extending in elevation from a first end to a second end secured to the rotor mast, wherein the drive arm drives rotation of the rotary swashplate about the axis of rotation by a plane connection including a fork, the first portion being held captive laterally between two lateral branches of the fork, the fork being hinged to the rotary swashplate giving the rotary swashplate a degree of freedom to move in rotation about a radial direction of the rotary swashplate relative to the fork, wherein the drive arm includes a first end vertical portion forming the first end, followed by a rounded intermediate portion having a radius, and a second end horizontal portion forming the second end, the second end portion comprising a ring for engaging around at least a portion of the rotor mast.