GB1365380A - Sine tables - Google Patents

Abstract

1365380 Sine tables K O BROWN 16 Aug 1972 [18 Aug 1971] 38715/71 Heading B3B A sine table comprises a lower member 1 having an exposed lower major face 8 for contacting a support, an upper member 2 having an exposed major face 2 to be contacted by a workpiece, said upper member being mounted on said lower member by a pivot 3 whose axis is parallel to both of said major faces, an abutment surface 6 on the lower member, a cylindrical abutment element 5 secured to the upper member wherein the point of contact of the said element 5 with the said abutment surface 6 is angularly offset from a plane 9 parallel to the lower major surface 8 and passing through the pivot axis, such that as the upper exposed surface 2 moves from a horizontal to a vertical position the horizontal component of the distance between the abutment element 5 and the pivot axis first increases and then decreases and at its minimum value is more than half its maximum value. The sine table has a working range of 90 degrees and the said angular offset is 45 degrees with the abutment element 5 being on the end of a column 4.