US PATENT SUBCLASS 72 / 398
.~.~ Movable toward and against portion of work (e.g., floating mandrel)

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

394  DF  BY THREE OR MORE COACTING RELATIVELY MOVABLE TOOLS (I.E., TOOL-COMPLEX) {4}
396  DF  .~ Yieldable face portion or auxiliary tool on tool-couple element {2}
398.~.~ Movable toward and against portion of work (e.g., floating mandrel)

DEFINITION

Classification: 72/398

Movable toward and against portion of work (e.g., floating mandrel):

(under subclass 396) Device wherein said relatively distortable or displaceable part or said distinct member is disposed and arranged to be driven into deforming contact with work by the reaction force derived from the displacement of another portion of work undergoing deformation.

(1) Note. The yieldable tool in this subclass is thus both in active and a passive tool; it takes reaction force from a portion of work and transfers it to another portion of work.

(2) Note. Typical of this subclass is a "floating mandrel" which lies within hollow work while the latter is being subjected to external hammering or pressing treatment by an opposed-face tool couple. The mandrel may serve merely to maintain the interior dimension of the work or it may permit and limit a redimensioning of the interior. (See Figure A of the appended diagram). Examples of tool complex devices: A. Floating mandrel (subclass 398); B. Yieldable auxiliary tool (T3) on actuated tool (T1) (subclass 397). [figure] [figure]

(3) Note. This subclass also accommodates the combination of one or more tools (dies or mere platens) interposed between successive layers of stacked workpieces in a press.