Rasp type threshing cylinder and elastic concave elements

Claim 1

IN A THRESHER, A CONCAVE INLCUDING A CURVED BASE COMPRISING A PLURALITY OF SPACED STIFF TRANSVERSE BARS SPACED APART UPON AN ARCUATE SWEEP, A CYLINDER HAVING MASCERATING AND RUBBING RASP-BARS THEREON, SAID CYLINDER BEING JOURNALLED FOR ROTATION WITHIN THE SWEEP OF SAID BASE, SAID TRANSVERSE BARS WHEN IN OPERATIVE POSITION BEING SPACED A SUBSTANTIAL RADIAL DISTANCE FROM THE SWEEP OF THE RASP-BAR CYLINDER, ELASTIC RUBBER-LIKE COVERINGS STRADDLING THE TRANSVERSE BARS OF SAID BASE AND OCCUPYING SUBSTANTIALLY ALL OF THE RADIAL SPACING BETWEEN THE RASPBAR CYLINDER AND THE TRANSVERSE BARS, SAID COVERINGS HAVING FACES OF SUBSTANTIAL WIDTH LYING SUBSTANTIALLY TANGENTIAL TO THE PATH OF ROTATION OF THE RASP-BARS AND BEING SPACED CIRCUMFERENTIALLY FROM ADJACENT FACES, WHEREBY GRAIN BEING THRESHED MAY BE COMPRESSED BETWEEN THE RASP-BARS AND THRESHER BARS TO RUB AND SEPARATE THE SURROUNDING PODS WITHOUT COMPRESSING AND ABRADING THE ENCLOSED GRAINS, UNDULY.