Abstract 1, 030, 436. Mixing apparatus with intermeshing screws. FARBENFABRIKEN BAYER A.G. April 9, 1963 [April 11, 1962], No. 14149/63. Heading B1C. In kneading and mixing apparatus having intermeshing screws rotating in the same direction so that the crest and groove of mating screws always engage without clearance, the crest width of the thread is narrower than the width of the base of the grooves and between the turns of the screw the cores are in contact and the centre line between the axial of the screws. As shown a screw has a major diameter D and a minor diameter dK, the groove F extending over a small part only of the axial distance between successive cresto, and the screw cores being enlarged to the effective diameter dK1 for the major part of the distance. This arrangement reduces the material between the screws and the housing to a thickness N with more effective heat transfer; the screws may be formed as sleeves detachable from the drive shafts the distance between which is equal to the effective diameter dK<SP>1</SP> of the screws.
A SCREW APPARATUS WHICH COMPRISES A PAIR OF SCREW SLEEVE MEMBERS DISPOSED FOR ROTATION IN TNE SAME DIRECTION ABOUT PARALLEL AXES WITH THEIR RESPECTIVE SCREW THREADS INTERMESHING, SAID SCREW SLEEVE MEMBERS EACH BEING DISPOSED FOR REMOVABLE MOUNTING UPON A CORRESPONDING DRIVE SHAFT FOR ROTATION WHEREBY, EACH OF SAID SCREW SLEEVE MEMBERS BEING PROVIDED WITH A SPIRAL GROOVE HAVING AN AXIAL DIMENSION LESS THAN THAT OF THE SCREW PITCH, SAID SCREW SLEEVE MEMBERS BEING DISPLACED FOR ROTATION ABOUT PARALLEL AXES SPACED FOR SCRAPPING CONTACT ENGAGEMENT BETWEEN THE SPIRAL GROOVE OF ONE SCREW SLEEVE MEMBER AND THE THREAD COMB OF THE OTHER.
Claim 2
Dependent Claim
100 words
A SCREW APPARATUS WHICH COMPRISES A PAIR OF SCREW SLEEVE MEMBERS DISPOSED FOR ROTATION IN TNE SAME DIRECTION ABOUT PARALLEL AXES WITH THEIR RESPECTIVE SCREW THREADS INTERMESHING, SAID SCREW SLEEVE MEMBERS EACH BEING DISPOSED FOR REMOVABLE MOUNTING UPON A CORRESPONDING DRIVE SHAFT FOR ROTATION WHEREBY, EACH OF SAID SCREW SLEEVE MEMBERS BEING PROVIDED WITH A SPIRAL GROOVE HAVING AN AXIAL DIMENSION LESS THAN THAT OF THE SCREW PITCH, SAID SCREW SLEEVE MEMBERS BEING DISPLACED FOR ROTATION ABOUT PARALLEL AXES SPACED FOR SCRAPPING CONTACT ENGAGEMENT BETWEEN THE SPIRAL GROOVE OF ONE SCREW SLEEVE MEMBER AND THE THREAD COMB OF THE OTHER.