US 12,318,744 B2
Asymmetrical three-blade screw-type shaft for a mixing and kneading machine
Martin Schötzau, Augst (CH); and Wolfgang Walter, Aalen (DE)
Assigned to BUSS AG, Pratteln (CH)
Filed by BUSS AG, Pratteln (CH)
Filed on Apr. 14, 2023, as Appl. No. 18/134,807.
Application 18/134,807 is a continuation of application No. 16/756,726, granted, now 11,779,891, previously published as PCT/EP2018/076883, filed on Oct. 2, 2018.
Claims priority of application No. 17196908 (EP), filed on Oct. 17, 2017; application No. 18152448 (EP), filed on Jan. 19, 2018; and application No. 18170198 (EP), filed on Apr. 30, 2018.
Prior Publication US 2023/0249143 A1, Aug. 10, 2023
Int. Cl. B01F 27/724 (2022.01); B01F 27/1143 (2022.01); B01F 101/00 (2022.01); B29B 7/42 (2006.01); B29C 48/45 (2019.01); B29C 48/565 (2019.01); B29C 48/685 (2019.01)
CPC B01F 27/724 (2022.01) [B01F 27/1143 (2022.01); B29B 7/421 (2013.01); B29B 7/423 (2013.01); B29B 7/429 (2013.01); B29C 48/45 (2019.02); B29C 48/565 (2019.02); B29C 48/687 (2019.02); B01F 2101/2805 (2022.01); B01F 2215/0422 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A worm shaft (12) for a mixing and kneading machine (100) having a shaft rod (20) having a circular cross-section, on the circumferential surface of which blade elements (22, 22′, 22″, 22′″, 22iv, 22v) are arranged which are spaced apart from one another and which extend outwards from the circumferential surface of the shaft rod (20) wherein the blade elements (22, 22′, 22″, 22′″, 22iv, 22v) are arranged on the circumferential surface of the shaft rod (20), at least in one section extending in the axial direction of the worm shaft (12), in three rows (40) extending in the axial direction of the worm shaft (12), wherein the entire circumferential surface of this section extending in the axial direction of the worm shaft (12) does not comprise any further blade elements except those arranged in the three rows (40), wherein i) at least one of the blade elements (22, 22′, 22″, 22′″, 22iv, 22v) of at least one other of the both rows (40) is different from one of the blade elements (22, 22′, 22″, 22′″, 22iv, 22v) of one of the other rows (40) by being shorter and/or narrower, and/or ii) the rows (40) of the blade elements (22, 22′, 22″, 22′″, 22iv, 22v), viewed in cross-section of the shaft rod (20), are distributed irregularly over the circumference defined by the outer circumferential surface of the shaft rod (20), so that the angular distance between the midpoints M of the outer circumferential surfaces of the blade elements (22, 22′, 22″, 22′″, 22iv, 22v) on the circumferential surface of the shaft rod (20) of adjacent rows (40) differs between at least two of the three rows (4) of the at least other two rows (40);
wherein the angular distance a between the midpoints M of the outer circumferential surface of the blade element (22, 22′, 22″, 22′″, 22iv, 22v) of two of the three rows (40) of the at least one section extending in the axial direction of the worm shaft (12) on the circumferential surface of the shaft rod (20) is 124° to 146°, and the angular distances between the midpoint M of the outer circumferential surfaces of the other row and each of the midpoints M of the outer circumferential surface of the two rows (40) on the circumferential surface of the shaft rod (20) are 102° to 123°.