US PATENT SUBCLASS 277 / 467
.~.~ Particular piston ring expander

Current as of: June, 1999
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277 /   HD   SEAL FOR A JOINT OR JUNCTURE

345  DF  SEAL BETWEEN RELATIVELY MOVABLE PARTS (I.E., DYNAMIC SEAL) {10}
434  DF  .~ Piston ring or piston ring expander or seat therefor {15}
467.~.~ Particular piston ring expander {12}
468  DF  .~.~.~> Separate and other than metal
469  DF  .~.~.~> Bias limiting feature
470  DF  .~.~.~> Adjustable loading feature
471  DF  .~.~.~> Thermal expansion feature
472  DF  .~.~.~> Annular expander nested in annular groove of the piston ring {3}
477  DF  .~.~.~> Slotted or undulating circular band including inclined or axially facing seat for the piston ring {1}
482  DF  .~.~.~> Circumferentially spaced separately seated radially acting bias feature {1}
484  DF  .~.~.~> Radially extending tongue formed from expander
485  DF  .~.~.~> Undulating periphery providing axially extending face against inner perimeter of the piston ring
486  DF  .~.~.~> Bias feature adjoining opposed ends of split or segmented piston ring
487  DF  .~.~.~> Segmented
488  DF  .~.~.~> For axially adjacent piston rings

DEFINITION

Classification: 277/467

Particular piston ring expander:

(under subclass 434) Piston ring expander wherein the piston ring has inherent specific biasing means or a separate specific biasing means to outwardly bias the piston ring against the enclosing wall.

(1) Note. Do speculate on the resilient nature of the ring. There must be some indication of this resilient nature by a

ring being defined as resilient or expansible, or by a structure causing expansion (e.g., wedging surfaces forcing a ring outwardly, etc.).

SEE OR SEARCH THIS CLASS, SUBCLASS:

447+, for expansion means created by the relative movement of a floating piston ring in its groove.