Patent ID: 8025467

Claim:
A countersinking-carrier nozzle, which comprises a flat front surface ( 4 ) endowed with a central hole ( 9 ) through which emerges a countersinking drill ( 3 ) in order to establish a depth limit of countersinking when the flat front surface ( 4 ) presses against the countersinking surface ( 13 ); and includes flexible means of retention of the flat front surface ( 4 ) so that it swivels when contacting with a curved countersinking surface ( 13 ) and adapts itself and presses against it tangentially while the pressure is maintained; wherein the flexible means are defined by a ball-and-socket joint ( 2 ) comprising a curvo-concave retention receptacle ( 8 ), with possibility of swivelling, a complementary curvo-convex portion provided in the rear part of the flat front surface ( 4 ), which projects from the receptacle ( 8 ); all this in order to avoid displacement of said complementary curvo-convex portion and of said flat front surface ( 4 ) when the latter abruptly makes contact with the curved surface ( 13 ); wherein the receptacle ( 8 ) is retained in a headstock ( 1 ), with possibility of swivelling, the rear complementary portion of the flat front surface ( 4 ) being provided in one piece ( 8 ) mounted to the headstock ( 1 ); and wherein the receptacle piece ( 8 ) is secured to the headstock ( 1 ) by pins ( 7 ) which run through holes made in the headstock ( 1 ) and in the piece constituting the receptacle ( 8 ).