Patent ID: 9533745
Date: 2017-01-03
CPC Classifications: B63H,Y10T

Claim:
1. An assembly comprising a plurality of screws and a propeller provided with at least one blade pivoted rotatably to a cylindrical propeller casing, a hub coupled to an engine and mounted coaxially inside said propeller casing, a kinematic mechanism coupled to said hub, and/or to said propeller casing, and to said at least one blade for adjusting the fluid dynamic pitch of the propeller by means of rotation of said at least one blade about its pivot axis to said propeller casing, said hub being rotatable with respect to said cylindrical propeller casing, or vice versa, for at least one non-zero angular interval (α) of operation of said kinematic mechanism for adjusting the fluid dynamic pitch, said hub being integral with at least one contact surface that is movable between at least one position of disengagement from and at least one position of engagement, direct or indirect, with at least one relative abutment integral with said cylindrical propeller casing, said at least one relative abutment defining at least one limit stop of said at least one angular interval (α), wherein said plurality of screws comprises at least two different screws and said propeller comprises at least one seat for complete installation of at least one screw selected from said plurality of screws, said at least one limit stop abutment comprising at least one region of said at least one screw selected from said plurality of screws and installed completely in said seat, and wherein each screw has at least one stem having a different length with respect to that of the other screws.