US PATENT SUBCLASS 83 / 390
.~.~.~ Fluid pressure yieldable drive means

Current as of: June, 1999
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83 /   HD   CUTTING

374  DF  INTERRELATED TOOL ACTUATING MEANS AND MEANS TO ACTUATE WORK IMMOBILIZER {2}
375  DF  .~ Work clamp {9}
388  DF  .~.~ Clamp driven by yieldable means {2}
390.~.~.~ Fluid pressure yieldable drive means

DEFINITION

Classification: 83/390

(under subclass 388) Device, in which the clamp is moved by piston and cylinder or equivalent device subjected to hydraulic or pneumatic force, and provided with relief valve or other output limiting means.

(1) Note. The disclosure of a relief valve or other out-put limiting device in the fluid pressure drive system is evidence that the drive is "yieldable" rather than "positive" or "resilient".