An apparatus for oscillating a vane comprising a main lever pivoted at one end about a reference axis, and pivotally coupled at the other end to the vane about a vane axis remote from the reference axis; an angle change assembly connected to the vane such that rotation of the angle change assembl
An apparatus for oscillating a vane comprising a main lever pivoted at one end about a reference axis, and pivotally coupled at the other end to the vane about a vane axis remote from the reference axis; an angle change assembly connected to the vane such that rotation of the angle change assembly rotates the vane; and, a drive assembly, the drive assembly comprising a crank arm adapted to be pivoted about a fixed crank axis; a lever drive arm pivotally connected to the main lever at a point remote from the reference axis and pivotally connected to the main crank remote from the crank axis; a coupling member having first and second coupling arms connected together at a base, the base being adapted to pivot about a coupling axis; an angle drive arm connected at a first end to the angle change assembly for rotation thereof and pivotally connected to the first coupling arm remote from the coupling axis; the second coupling arm being pivotally connected to the lever drive arm remote from the coupling axis, the pivot being free to slide along the lever drive arm.
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The invention claimed is: 1. An apparatus for oscillating a vane comprising: a main lever pivoted at one end about a reference axis, and pivotally coupled at the other end to the vane about a vane axis remote from the reference axis; an angle change assembly connected to the vane such that rotation
The invention claimed is: 1. An apparatus for oscillating a vane comprising: a main lever pivoted at one end about a reference axis, and pivotally coupled at the other end to the vane about a vane axis remote from the reference axis; an angle change assembly connected to the vane such that rotation of the angle change assembly rotates the vane; and, a drive assembly, the drive assembly comprising a crank arm adapted to be pivoted about a fixed crank axis; a lever drive arm pivotally connected to the main lever at a point remote from the reference axis and pivotally connected to the main crank remote from the crank axis; a coupling member having first and second coupling arms connected together at a base, the base being adapted to pivot about a coupling axis; an angle drive arm connected at a first end to the angle change assembly for rotation thereof and pivotally connected to the first coupling arm remote from the coupling axis; the second coupling arm being pivotally connected to the lever drive arm remote from the coupling axis, the pivot being free to slide along the lever drive arm. 2. An apparatus as claimed in claim 1, wherein the lever drive arm comprises a guide running at least partially along its length, the pivot between lever drive arm and second coupling arm being free to move along the guide. 3. An apparatus as claimed in claim 1, wherein the angle change assembly comprises angle change means free to pivot about the reference axis and a linkage connecting the vane to the angle change means such that rotation of the angle change means rotates the vane, the angle drive arm being connected to the angle change means. 4. An apparatus as claimed in claim 3, wherein the angle change means comprises a wheel free to rotate about the reference axis, the angle drive arm being connected to the wheel. 5. An apparatus as claimed in claim 3, wherein the angle change means comprises a first wheel free to rotate about the reference axis, a second wheel free to rotate about a second axis remote from the reference axis and a second linkage means extending between the two wheels, the angle drive arm being connected to the second linkage means. 6. An apparatus as claimed in claim 5, wherein the second linkage means comprises a chain which passes around the first and second wheels. 7. An apparatus as claimed in claim 3, wherein the angle change means comprises an angle change arm pivotally connected to the reference axis, the angle drive arm being pivotally connected to the angle change arm. 8. An apparatus as claimed in claim 7, wherein the pivot between angle change arm and angle drive arm is free to slide along the angle change arm. 9. An apparatus as claimed in claim 8, wherein the angle change assembly further comprises a guide arm having one end pivotally connected to the end of the angle drive arm to restrict the motion of the angle drive arm. 10. An apparatus as claimed in claim 9, wherein the pivot between angle drive arm and guide arm is free to slide along the guide arm. 11. An apparatus as claimed in claim 10, wherein both ends of the guide arm are free to slide on tracks laterally displacing the guide arm. 12. An apparatus as claimed in claim 10, wherein the guide arm is connected and fixed relation to the main lever. 13. An apparatus as claimed in claim 12, wherein the guide arm is curved. 14. An apparatus as claimed in claim 13, wherein the radius of curvature of the guide arm varies along its length. 15. An apparatus as claimed in claim 9, wherein the opposite end of the guide arm is pivotally connected to a fixed point. 16. An apparatus as claimed in claim 9, wherein the opposite end of the guide arm is pivotally connected to the main lever. 17. An apparatus as claimed in claim 1, wherein the first and second coupling arms are co-linear. 18. An apparatus as claimed in claim 1, wherein the first and second coupling arms are co-planar but not co-linear. 19. An apparatus as claimed in claim 18, wherein the coupling member is V shaped.
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