Month in the Patent Office: A Selection of the More Important Aircraft and Engine Specifications Published Recently Available to Purchase

Means for mounting two structural members on each other about intersecting axes about which said members are permitted independent angular adjustment comprises a locating member, bearings for each of said structural members carried by the locating member adapted to prevent axial movement of the structural members while permitting angular adjustment about their axes relative to the locating member, the locating member being held in position solely by the structural members themselves and by bracing members fixed to the locating member. As applied to an aeroplane tail‐unit (Fig. 1), which comprises an elevator a, tail planes b, b1, and rudders c, c1, the elevator is fixed in a shaft a, angularly adjustable in a journal carried by struts a2, the tail planes b, b1 are fixed on a shaft b2, passing through the fuselage and angularly adjustable therein, and the rudders are fixed on rudder posts c2 each angularly adjustable about an axis which intersects the axis of shafts a1, b2. The rudder posts, are recessed at c3 where they are fitted with sleeves c4 within each of which a plummcr block d (Fig. 2) is carried. A locating member e carrying a ball bearing g for the shaft a1 or b2 is mounted between jaws d1, d2 of block d by means of trunnions rotatable in bushes d3. The trunnions f are assembled by inserting them from within the bearing housing formed in member e and are located by flanges f2. The trunnions f are threaded at f0 for the reception of locating studs by which they are held during the machining of the bearing housing. After this operation the trunnions f are held in position by the outer race g of the ball‐bearing for shaft a1. This bearing is of the self‐aligning type which resists end thrust and is held in position by a distance piece g2 and ring nut g3. The member e is provided with pins e7 extending outwardly on an axis at right angles to the intersecting axes of the trunnions f and shaft a1. Pins e7 attach lugs h carrying fore‐and‐aft tension stays h2, h3 attached to the fuselage.