Patent ID: 8288639

Claim:
An improved union group ( 1 ) for locking a music instrument (P) to a support element (A) including: one or more support organs ( 2 , 3 ) suitable to be associated with said support element (A) and to support said music instrument (P); a seal body ( 4 ) arranged close to at least one of said support organs ( 2 , 3 ); connection means ( 5 ) suitable to permanently bind said music instrument (P) to said support organs ( 2 , 3 ), characterized in that said connection means ( 5 ) include a bayonet joint ( 6 ), a part of which is given by a shaped portion ( 7 ) connected with said seal body ( 4 ) wherein said shaped portion ( 7 ) comprises a cylindrical stem ( 8 ) which defines a longitudinal axis of rotation (z) and at an end ( 8 a ) is provided with a pair of tongues ( 9 , 10 ) protruding from the outer surface ( 8 b ) of said cylindrical stem ( 8 ) symmetrically with respect to said axis of rotation (Z) and according to a plane orthogonal to said axis of rotation (Z) and having a base body ( 16 ) in which an axial through hole ( 17 ) is defined, suitable to be coupled with an end (E) of said support element (A) to interpose itself between said support organs ( 2 , 3 ) and said support element (A) wherein said axial through hole ( 17 ) is divided into: a lower nut screw ( 18 ) suitable to engage with a screw made in said end (E) of said support element (A); an upper hole ( 19 ), facing one of said support organs ( 2 , 3 ) and communicating with said lower screw nut ( 18 ) compared to which presents larger dimensions, suitable to receive said shaped portion ( 7 ) giving rise to the remaining part of said bayonet joint ( 6 ) and wherein said upper hole ( 19 ) presents in cross section a substantially elliptical profile ( 19 â€²) which defines a, major axis (Y) and a minor axis (X), and wherein said lower screw nut ( 18 ) and said upper hole ( 19 ) of said axial hole ( 20 ) define inside said base body ( 16 ) a ledge wall ( 20 ) close to which the lower edge ( 8 c ) and said tongues ( 9 , 10 ) of said cylindrical stem ( 8 ) strike and wherein the inner wall ( 19 a ) which delimits said upper hole ( 19 ) of said axial hole ( 17 ) has at said ledge wall ( 20 ) at least one annular groove ( 21 ) suitable to receive said tongues ( 9 , 10 ) of said cylindrical stem ( 8 ).