US PATENT SUBCLASS 72 / 439
.~.~.~ Wherein tool is retracted by pinch rolls acting on rectilinearly moving tool-support

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}
439.~.~.~ Wherein tool is retracted by pinch rolls acting on rectilinearly moving tool-support

DEFINITION

Classification: 72/439

Wherein tool is retracted by pinch rolls acting on rectilinearly moving tool support:

(under subclass 437) Apparatus wherein the tool* retracting means includes an elongated member located between two counter-rotating rollers that engage the member.

(1) Note. In use, the rollers are rotated so that their surface tangent to the member travel in a direction to retract the tool and pressure is exerted on the rollers tending to grip the member. The member, and the tool carried thereby, is lifted until the pressure is released, permitting the tool to drop.