US PATENT SUBCLASS 493 / 251
.~.~.~.~ Three point, continuous 180 degree folding

Current as of: June, 1999
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493 /   HD   MANUFACTURING CONTAINER OR TUBE FROM PAPER; OR OTHER MANUFACTURING FROM A SHEET OR WEB

51  DF  CONTAINER MAKING {2}
186  DF  .~ Pliable container (e.g., bag, envelope, etc.) {9}
243  DF  .~.~ Including folding {8}
250  DF  .~.~.~ By mandrel or plunger {3}
251.~.~.~.~ Three point, continuous 180 degree folding

DEFINITION

Classification: 493/251

Three point, continuous 180 deg. folding:

(under subclass 250) Method or apparatus including (a) use of a male forming member about which a sheet or web workpiece is to be wrapped without thrust and a pair of surfaces engaging the workpiece laterally outwardly on the opposite side of the workpiece from the location of the male forming member to exert bending force on the workpiece by movement of at least one of the surfaces of the pair; or, (b) use of a male forming member on which a sheet or web workpiece is shaped as a result of thrust of that member and a pair of reaction surfaces engaging the workpiece laterally outwardly on the opposite side from the location of the male forming member to exert bending force on the workpiece by movement of the forming member; wherein the workpiece is caused to wrap about the forming member on at least three sides in a single action.