"AUTOMATIC VALVE BLOCK ADJUSTER, COMBINATION, VALVE OPERATING MECHANISM, AND INTERNAL COMBUSTION ENGINE". An automatic valve slack adjuster comprising an internal screw thread housing (1); a screw member (3) with external screw thread extending inside the housing; the screw thread (4) of the screw member (3) having an outer shape that is complementary to the threaded shape of the housing's internal thread (2) and fits therewith a predetermined axial clearance, the thread having a symmetrical, trapezoidal shape in axial cross section and exhibiting same frictional resistance against movement in both axial directions; where the flank angles, propeller angle, and number of screw thread entries are selected to ensure that the screw member will rotate and advance axially out of the housing only under the influence of an axial force on its end within the housing. ; and the emergent end (7) of the screw member is adapted to work in conjunction with an adjacent component to receive frictional rotation resistance therefrom.
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