US PATENT SUBCLASS 166 / 211
.~.~ With spring

Current as of: June, 1999
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166 /   HD   WELLS

206  DF  EXPANSIBLE ANCHOR OR CASING {8}
209  DF  .~ Set by wedge or cam at any point by drop only (e.g., tubing catcher) {2}
211.~.~ With spring

DEFINITION

Classification: 166/211

(under subclass 209) Devices in which the stored energy of a spring is used to effect all or part of the movement of the outwardly movable means to the final position.

(1) Note. A spring used only as a friction drag does not come within the definition.