US PATENT SUBCLASS 72 / 438
.~.~.~ With means to control force of blow

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  DF  .~.~ Wherein energy is stored by retraction of tool {3}
438.~.~.~ With means to control force of blow

DEFINITION

Classification: 72/438

With means to control force of blow:

(under subclass 437) Apparatus provided with means for regulating or adjusting the power (either latent or developed) available for deformation.

(1) Note. Examples of disclosures include a spring-urged tool wherein the spring compression may be varied, a drop-hammer wherein the lift of the tool may be varied, and a lever-urged tool wherein the mechanical advantage of the lever may be varied.