Stirrer device and a method of adjusting it

A stirrer device (1b) 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 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,
• wherein the first stirrer assembly (3) is adapted to assume at least two different axial positions relative to said shaft (13;
• 14) and said device includes retaining means for retaining the first blade-type stirrer assembly (3) relative to the shaft (13;
• 14) in at least one of said two different axial positions, and
• of the type in which said shaft (14) is vertical, said at least two axial positions assumed by the first stirrer assembly (3) being a high position and a low position, characterized in that the retaining means include two grooves (24, 27) in the internal wall of the blade body (7) of the first stirrer assembly (3), said grooves (24, 27) being of different lengths and spaced angularly to cooperate selectively with an abutment (12) on said shaft (14) to enable the first blade-type stirrer assembly (3) to move between the high position and the low position.

A stirrer device (1b) 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 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,
• wherein the first stirrer assembly (3) is adapted to assume at least two different axial positions relative to said shaft (13;
• 14) and said device includes retaining means for retaining the first blade-type stirrer assembly (3) relative to the shaft (13;
• 14) in at least one of said two different axial positions, and
• of the type in which said shaft (13) is vertical, said at least two different axial positions assumed by the first stirrer assembly (3) being a high position and a low position, characterized in that the retaining means include a groove (27) in the internal wall of the blade body (7) of the first stirrer assembly (3), said groove (27) being adapted to cooperate with an abutment (11) on said shaft (13) to enable movement between the high position and the low position.