US PATENT SUBCLASS 72 / 453.06
.~.~.~ Pressure additive

Current as of: June, 1999
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72 /   HD   METAL DEFORMING

429  DF  WITH MEANS TO DRIVE TOOL {11}
453.01  DF  .~ Including pneumatic- or fluid-actuated tool support {7}
453.02  DF  .~.~ Multiple or staged drive means {3}
453.06.~.~.~ Pressure additive {3}
453.07  DF  .~.~.~.~> Axially aligned pistons
453.08  DF  .~.~.~.~> Independently actuated means
453.09  DF  .~.~.~.~> Pull-down press

DEFINITION

Classification: 72/453.06

Pressure additive:

(under subclass 453.02) Apparatus wherein one of the means forcing the tool toward the work transmits force to the tool and wherein the other means forcing the tool toward the work transmits force to the tool so that the total force acting on the tool represents the sum of the forces of the two forcing means.