US PATENT SUBCLASS 277 / 434
.~ Piston ring or piston ring expander or seat therefor

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.~ Piston ring or piston ring expander or seat therefor {15}
435  DF  .~.~> Having installation, removal assembly, disassembly, or repair feature
436  DF  .~.~> Piston ring having peripheral radially sealing flexible projection (e.g., piston cup, etc.) {2}
440  DF  .~.~> Piston ring surface of dissimilar material or hardness {2}
445  DF  .~.~> Rotation limiting feature (i.e., antirotation) {1}
447  DF  .~.~> Floating piston ring {1}
449  DF  .~.~> Particular piston seat {6}
458  DF  .~.~> Piston ring having single piece noncircular or multiturn (e.g., helical, spiral, oblong, elliptical, polygonal, etc.) shape
459  DF  .~.~> Piston ring including exposed port, slot, pocket, groove, channel, recess, or bevel {3}
466  DF  .~.~> Piston ring displays twisting or torsion
467  DF  .~.~> Particular piston ring expander {12}
489  DF  .~.~> Sectional piston ring structure {2}
493  DF  .~.~> Segmented piston ring
494  DF  .~.~> Separate bridging piece for gap in piston ring {1}
496  DF  .~.~> Split single piece piston ring having opposed asymmetrical mirrored ends {1}
498  DF  .~.~> Split single piece piston ring having other than opposed asymmetrical mirrored ends {1}

DEFINITION

Classification: 277/434

Piston ring or piston ring expander or seat therefor:

(under subclass 345) Dynamic seal comprising an annular seal provided for a part (i.e., a piston) that reciprocates along an axis of an enclosing wall and the seal is for engaging the wall; means to outwardly bias the seal against the enclosing wall; or means (e.g., a seat, etc.) on the part reciprocating along the axis of the enclosing wall to locate or retain the seal or biasing means in an operative position.

SEE OR SEARCH THIS CLASS, SUBCLASS:

310, for a process of dynamic sealing employing a piston ring for an internal combustion engine.

311, for a process of dynamic sealing employing a flexible ring.

909, for a seal having similar sealing structures for a piston and rod.

910, for an O-ring seal.

SEE OR SEARCH CLASS 29, Metal Working, for a method of mechanical manufacture or apparatus to assemble or disassemble,

888.07+, for a method of piston ring or packing manufacture.

92, Expansible Chamber Devices,

172+, for more than nominal detailed structure of a piston except where limited to detailed structure (e.g., a seat, a fluid passageway in seat, etc.) solely intended to cooperate with a piston ring or piston ring expander.

100, Presses,

269.21, for a seal or gasket around a piston for a fluid actuated reciprocationg press.

188, Brakes, for means of retarding motion of or stopping of machines;

72.4+, for a fluid pressure piston axially actuating a brake element or housing against a wheel that may include a seal, or subclass 322.18 for an internal resistance motion retarder including a thrust component used to vary volume in a fluid-filled chamber having a particular retarder component structure with a dynamic sealing ring between a piston and cylinder.