US PATENT SUBCLASS 72 / 59
.~.~.~ Corrugating tubular work


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

54  DF  BY APPLICATION OF FLUENT MEDIUM, OR ENERGY FIELD {4}
57  DF  .~ With actuated tool engaging work {1}
58  DF  .~.~ Expanding hollow work {1}
59.~.~.~ Corrugating tubular work


DEFINITION

Classification: 72/59

Corrugating tubular work:

(under subclass 58) Subject matter comprising a step of, or means for, the formation of two or more axially spaced, substantially identical, annular enlargements in cylindrical work.

(1) Note. For placement in this subclass, a patent should be directed to the combination of actuated tool means and internal fluid pressure means so disposed as to produce a series of substantially similar annular ridges and grooves in tubular work; at least two spaced enlargements of similar form and size distinguishes "corrugating" from the more general inflating or expanding operations of the preceding subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

61+, for expanding hollow work against an external die by fluid pressure within the work.