Patent ID: 7946818

Claim:
A shock absorbing device for an adjustable pitch propeller with feathering blades, each blade of which having a planet gear engaging on a pinion-hub rotated by a drive shaft and composed of a first flanged cylindrical sleeve keyed to the drive shaft, the flange of the first flanged cylindrical sleeve has a plurality of circular cavities uniformly distributed around a circumference of the flange, each cavity containing a resilient insert of elastomer, and a second flanged cylindrical sleeve slid on a cylindrical portion of said first sleeve and ending with said pinion, the terminal flange of the second flanged cylindrical sleeve having a plurality of pins uniformly distributed around a circumference of the flange, each pin engaging a respective annular insert of elastomer, characterized in that through the bottom of each of said circular cavities housing said annular inserts of elastomer of the flange of said first cylindrical sleeve is present a hole coaxial to the axis of a central hole of said annular insert of elastomer and having a diameter larger than a diameter of the central hole of the annular insert of elastomer and of the relative engaging pin and in that said pins extend through said coaxial hole present on the bottom of the respective circular cavities of the flange of said first cylindrical sleeve.