Patent ID: 8899825

Claim:
A stirrer device ( 1 a ; 1 b ) including: at least one shaft ( 13 ; 14 ), a first blade-type stirrer assembly ( 3 ) and a second blade-type stirrer assembly ( 2 ), each blade-type stirrer assembly ( 2 , 3 ) including a blade body ( 7 , 6 ) directly or indirectly mounted on and constrained to rotate with said shaft ( 13 ; 14 ), each blade body ( 7 , 6 ) carrying at least one blade ( 5 , 4 ), said first and second stirrer assemblies ( 2 , 3 ) being axially movable relative to each other, wherein the blade body ( 6 ) of the second stirrer assembly ( 2 ) is permanently mounted on the blade body ( 7 ) of the first stirrer assembly ( 3 ) so as to nest freely and telescopically with the blade body ( 7 ) of the first stirrer assembly between at least two positions, a close-together position corresponding to a short configuration in which the blade bodies ( 7 , 6 ) of the stirrer assemblies ( 2 , 3 ) are close together in the axial direction and a spaced-apart position corresponding to a long configuration in which the blade bodies ( 7 , 6 ) of the stirrer assemblies ( 2 , 3 ) are spaced apart from each other in the axial direction, at least the extreme spaced-apart position being defined by an abutment, and wherein the blade body ( 6 ) of the second stirrer assembly ( 2 ) and the blade body ( 7 ) of the first stirrer assembly ( 3 ) telescopically slide one inside another.