Patent ID: 9656763
Date: 2017-05-23
CPC Classifications: B64D,F05D,F15B,F16B

Claim:
1. An actuator for a ram air turbine system comprising: a piston rod that is cylindrical in shape and centered about a centerline; a plurality of stow lock pawls supported by the piston rod and able to move radially, each of the plurality of stow lock pawls having an outer surface, an end, a frusto-conical crown with a crown radius positioned between the outer surface and the end, and a frusto-conical relief positioned between the crown and the outer surface; a lock bolt extending along the centerline radially within the piston rod, the lock bolt configured to be axially movable within the piston rod between a stowed position and a deployed position; a plurality of rollers radially outward from the centerline configured to be guided by the lock bolt; and a cylinder having a frusto-conical mating surface with a mating radius, the cylinder positioned radially outward from the piston rod and configured to be axially movable between the stowed position and the deployed position; wherein a ratio of the crown radius of the plurality of stow lock pawls to the mating radius of the cylinder is between 0.90 and 0.98; and wherein the crown and the mating surface both extend at a first angle, and the relief extends at a second angle that is different than the first angle.