US PATENT SUBCLASS 123 / 90.55
.~.~.~.~ Hydraulic

Current as of: June, 1999
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123 /   HD   INTERNAL-COMBUSTION ENGINES

90.1  DF  POPPET VALVE OPERATING MECHANISM {19}
90.48  DF  .~ Tappet {4}
90.52  DF  .~.~ Lash adjustment {1}
90.53  DF  .~.~.~ Self-operating {2}
90.55.~.~.~.~ Hydraulic {4}
90.56  DF  .~.~.~.~.~> Pressure flow upwardly into pressure chamber
90.57  DF  .~.~.~.~.~> Vent or bleed means for pressure chamber
90.58  DF  .~.~.~.~.~> Self-contained
90.59  DF  .~.~.~.~.~> With provision for horizontal positioning

DEFINITION

Classification: 123/90.55

(under subclass 90.53) Device wherein the self-operating adjusting means is of the reciprocating hydraulic chamber type.

(1) Note. Requisite to a device of this nature is the presence, within the tappet element, of a reservoir, a pressure (or power) chamber, and a check valve to isolate the chamber from the reservoir.