(under the class definition) Elements comprising a rotatable, oscillatable, or reciprocable machine element (usually a plate or a cylinder) having a surface or a groove formed therein of predetermined contour which will impart a prescribed motion of reciprocation or oscillation such as generally cannot be obtained by gear wheels or link motion, to a follower slidably contacting with such surface or groove.
SEE OR SEARCH CLASS
123, Internal-Combustion Engines,
90.48, 90.6, for a cam or a follower in a poppet valve operating mechanism.
