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The invention comprises a grille blade, a frictional blade assembly for grilles using blades, and a grille assembly using blades, each blade defining a first and second end and upper and lower sides, being of uniform cross-sectional shape and size along its length, each blade defining a generally st

The invention comprises a grille blade, a frictional blade assembly for grilles using blades, and a grille assembly using blades, each blade defining a first and second end and upper and lower sides, being of uniform cross-sectional shape and size along its length, each blade defining a generally streamline-shaped tube, the tube defining a first edge, a second edge and an internal space and being formed from an integral sheet of relatively thin material, whereby the sheet is bent back upon itself and one sheet edge is secured below another, the internal space at the first edge being of generally circular cross-section over an arc of approximately 270°, a circular cross-section having a diameter of between 0.002" and 0.004" less than that of abutments over which the blades are to be rotatably attached.

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1. A frictional blade assembly for grilles to be used in association with air ventilation systems wherein said assembly comprises: a first thermoplastic support bar defining a stem, which stem defines a longitudinal axis, and having a plurality of coplanar abutments extending essentially normal t

1. A frictional blade assembly for grilles to be used in association with air ventilation systems wherein said assembly comprises: a first thermoplastic support bar defining a stem, which stem defines a longitudinal axis, and having a plurality of coplanar abutments extending essentially normal to one side of said axis, each of said abutments being more or less the same length and having an outer surface of uniform generally cylindrical shape and having more or less the same diameter, and said abutments being formed integrally as part of said support bar; a plurality of blades, each of said blades defining a first and second ends and upper and lower sides, and being of uniform cross-sectional shape and size along its length, each said blade defining a generally streamline-shaped tube, said tube defining a first edge, a second edge and an internal space, the tube being formed from an integral sheet of relatively thin material whereby the sheet is bent back upon itself and one sheet edge is secured below another, said internal space at said first edge being of generally circular cross-section over an arc of approximately 270°, said circular cross-section having a diameter of between 0.002" and 0.004" less than that of said abutments, said first end of said blades being rotatably attached to respective said abutments by inserting a said abutment into said internal space at the first edge of said blade, whereby a frictional fit between each said abutment and a respective said blade is obtained; pairs of longitudinal rib means formed along the length of each side of each blade, members of each pair being essentially in opposition to each other and members of at least one pair defining a space therebetween, and, and second thermoplastic support bar defining a stem, which stem defines a longitudinal axis, and having a plurality of coplanar abutments extending essentially normal to one side of said axis, said second bar being affixed to said second ends of said blades at said first edges, whereby said blades may be rotated relative to said first and second bars against a frictional resistance. 2. A frictional blade assembly as claimed in claim 1 wherein said second thermoplastic support bar is essentially indentical to said first support bar. 3. A frictional blade assembly as claimed in claim 2 wherein said blades have a width greater than 0.490" and less than 1.010". 4. A frictional blade assembly as claimed in claim 3 wherein each said abutment defines a tapered free end. 5. A frictional blade assembly as claimed in claim 4 wherein said blades are less than or equal to 24" in length and said abutments are less than or equal to 1.0" in length, said abutment length being exclusive of the length of said tapered free end of said abutment. 6. A frictional blade assembly as claimed in claim 5 wherein said stems of said thermoplastic support bars define stem extension portions extending along said axis from said stems. 7. A frictional blade assembly as claimed in claim 6 wherein said thermoplastic is a thermoplastic polyester containing 20 to 30% glass fibres. 8. A frictional blade assembly as claimed in claim 7 wherein said blades are roll-formed from sheet aluminum, said sheet aluminum being of a pre-determined thickness. 9. A frictional blade assembly as claimed in claim 8 wherein the diameters of said abutments and the said aluminum thickness are related to the amount of total grille area by the following relationship: ##EQU## 10. A frictional blade assembly as claimed in claim 2 wherein said surface of each of said abutments defines groove means extending along said surface. 11. A frictional blade assembly as claimed in claim 6 wherein said stem extensions define a trapezoidal cross-section. 12. A frictional blade assembly as claimed in claim 4 wherein said tapered free end defines a frusto-conical shape. 13. A frictional blade assembly as claimed in claim 1 wherein said internal space at said second edge of said blades is of generally circular cross-section over an arc of approximately 270° and including third and fourth thermoplastic support bars, each of said third and fourth bars defining a stem, which stem defines a longitudinal axis, and having a plurality of coplanar abutments extending essentially normal to one side of said axis, each said abutment of said third bar being inserted into said internal space at the second edge of a respective said blade at said first end of said blade, each said abutment of said fourth bar being inserted into said internal space at the second edge of a respective said blade at said second end of said blade. 14. A frictional blade assembly as claimed in claim 13 wherein each of said abutments of said third and fourth bars defines a circular cross-section and has a diameter of between 0.002" and 0.004" greater than that of said circular cross-sectional portion of said internal space at said second edge of said blades. 15. A frictional blade assembly as claimed in claim 14 wherein said second, third, and fourth bars are essentially identical to said first bar. 16. A grille assembly for use in association with air ventilation systems wherein said assembly comprises: a frictional blade assembly, and, a grille frame means in which said blade assembly is supported; wherein said blade assembly comprises: a first thermoplastic support bar defining a stem, which stem defines a longitudinal axis, and having a plurality of coplanar abutments extending essentially normal to one side of said axis, each of said abutments being more or less the same length and having a smooth outer surface of uniform cylindrical shape and having more or less the same diameter and defining a tapered free end, said abutments being formed integrally as part of said support bar; a plurality of blades, each of said blades defining a first and second ends and upper and lower sides, and being of uniform cross-sectional shape and size along its length, each said blade defining a generally streamline-shaped tube, said tube defining a first edge, a second edge and an internal space, the tube being formed from an integral sheet of relatively thin material whereby the sheet is bent back upon itself and one sheet edge is secured below another, said internal space at said first edge being of generally circular cross-section over an arc of approximately 270°, said circular cross-section having a diameter of between 0.002" and 0.004" less than that of said abutments, and said first end of said blades being rotatably attached to respective said abutments by inserting a said sbutment into said internal space at the first edge of said blade, whereby a frictional fit between each said abutment and a respective said blade is obtained; pairs of longitudinal rib means formed along the length of each side of each blade, members of each pair being essentially in opposition to each other and members of at least one pair defining a space therebetween, and, a second thermoplastic support defining a stem, which stem defines a longitudinal axis, and having a plurality of coplanar abutments extending essentially normal to one side of said axis, said second bar being affixed to said second ends of said blades at said first edges, whereby said blades may be rotated relative to said first and second bars against a frictional resistance. 17. A grille assembly as claimed in claim 16 wherein said second thermoplastic support bar is essentially identical to said first support bar. 18. A grille assembly as claimed in claim 17 wherein said frame means defines a first recess, said recess being adaptable to receive and support said frictional blade assembly. 19. A grille assembly as claimed in claim 18 wherein said stems and said first recess define trapezoidal cross-sections whereby said support bars may be dovetailed into said first recess. 20. A grille assembly as claimed in claim 19 wherein said stem extends outwardly of said recess whereby to define a clearance between said blades and said grille frame means. 21. A grille assembly as claimed in claim 16 wherein said internal space at said second edge of said blades is of generally circular cross-section over an arc of approximately 270° and including third and fourth thermoplastic support bars each of said third and fourth bars defining a stem, which stem defines a longitudinal axis, and having a plurality of coplanar abutments extending essentially normal to one side of said axis, each said abutment of said third bar being inserted into said internal space at the second edge of a respective said blade at said first end of said blade, each said abutment of said fourth bar being inserted into said internal space at the second edge of a respective said blade at said second end of said blade. 22. A grille assembly as claimed in claim 21 wherein said frame means defines first and second recesses, said first recess being adaptable to receive and support said first and second support bars and said second recess being adaptable to receive and support said third and fourth support bars. 23. A grille assembly as claimed in claim 22 wherein said second, third and fourth support bars are essentially identical to said first support bar and wherein said stems and said first and second recesses define trapezoidal cross-sections whereby said support bars may be dovetailed into said first and second recesses. 24. A blade for use in an air ventilation grille, said grille including thermoplastic support bars having a plurality of coplanar abutments of cylindrical shape, said blade defining a first and second end, and being of uniform cross-sectional shape and size along its length, each said blade defining a generally streamline-shaped tube, said tube defining a first edge, a second edge and an internal space, the tube being formed from an integral sheet of relatively thin material whereby the sheet is bent back on itself and one sheet edge is secured below another, said internal space at said first edge being of generally circular cross-section over an arc of approximately 270°, said circular cross-section having a diameter of between 0.002" and 0.004" less than that of said abutments, said first end of said blades being adaptable to be rotatably attached to a said abutment by inserting said abutment into said internal space at the first edge of the blade, whereby a frictional fit between the abutment and the blade is obtained, pairs of longitudinal rib means formed along the length of each side of each blade, members of each pair being essentially in opposition to each other and members of at least one pair defining a space therebetween. 25. A blade as claimed in claim 24 wherein said rib means comprises at least one external groove and internal ridge formation extending along the length of the blade on each side thereof, the said formations on each side defining a space therebetween.