Patent ID: 7318508
Filing Date: 2008-01-15
Classification: F16D

Abstract:
1. A one-way rotational transfer mechanism comprising: a rotary input shaft having a normal surface and a first holding surface which respectively lie in two separate parallel planes normal to an axis of said rotary input shaft; a hollow-cylindrical rotary output shaft, having a cylindrical inner peripheral surface, positioned around said rotary input shaft to be freely rotatable relative to said rotary input shaft; a circumferentially-uneven-width-space forming portion formed on said rotary input shaft adjacent to said normal surface to form at least one accommodation space between said rotary input shaft and said cylindrical inner peripheral surface; a movable member, movable along said axis of said rotary input shaft, which is positioned so that said first holding surface is positioned between said movable member and said normal surface, said movable member having a second holding surface which faces said first holding surface, said second holding surface being normal to said axis; a plurality of balls positioned between said first holding surface and said second holding surface; at least one roller member installed in said accommodation space; and a biasing device which biases said movable member toward said first holding surface so that said balls are sandwiched between said first holding surface and said second holding surface and so that said normal surface and said roller member come into pressing contact with each other, wherein said circumferentially-uneven-width-space forming portion is shaped so that a rotation of said rotary input shaft is transferred to said hollow-cylindrical rotary output shaft via said roller member to which said rotation is applied from said normal surface when said rotary input shaft is rotated.