US PATENT SUBCLASS 49 / 238
.~.~.~ Shiftable cam

Current as of: June, 1999
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49 /   HD   MOVABLE OR REMOVABLE CLOSURES

208  DF  MOUNTED FOR MULTIDIRECTIONAL OR OBLIQUE MOVEMENT {7}
236  DF  .~ One direction imparts gravitational bias to swinging closure; e.g., rising hinge {2}
237  DF  .~.~ Biased by inclined cam and descending slide or roller {2}
238.~.~.~ Shiftable cam

DEFINITION

Classification: 49/238

(under subclass 237) Device wherein the inclined surface is movable to change its inclination so that the sliding or rolling surfaces are urged in opposite directions.