US PATENT SUBCLASS 493 / 250
.~.~.~ By mandrel or plunger

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.~.~.~ By mandrel or plunger {3}
251  DF  .~.~.~.~> Three point, continuous 180 degree folding
252  DF  .~.~.~.~> Mandrel having rectangular surface
253  DF  .~.~.~.~> Forming triangularly folded container surface

DEFINITION

Classification: 493/250

By mandrel or plunger:

(under subclass 243) Method or apparatus including use of (a) a male forming member about which the sheet or web workpiece is wrapped without thrust of the forming member; or, (b) a male forming member on which the sheet or web workpiece is shaped as a result of thrust of that member.

(1) Note. A mandrel is similar in structure to a plunger, but it is not intended to form work by force applied to the mandrel, rather is intended to serve as a reaction member onto which work is formed.