US PATENT SUBCLASS 72 / 437
.~.~ Wherein energy is stored by retraction of tool

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

429  DF  WITH MEANS TO DRIVE TOOL {11}
435  DF  .~ Mechanical potential-energy drive means only {2}
437.~.~ Wherein energy is stored by retraction of tool {3}
438  DF  .~.~.~> With means to control force of blow
439  DF  .~.~.~> Wherein tool is retracted by pinch rolls acting on rectilinearly moving tool-support
440  DF  .~.~.~> Wherein tool is retracted by flexible strap

DEFINITION

Classification: 72/437

Wherein energy is stored by retraction of tool:

(under subclass 435) Apparatus wherein latent power is generated by moving the tool away from the work or away from a cooperating tool.