US PATENT SUBCLASS 123 / 90.57-- .~.~.~.~.~ Vent or bleed means for pressure chamber

US PATENT SUBCLASS 123 / 90.57
.~.~.~.~.~ Vent or bleed means for pressure chamber

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	DF	.~.~.~.~ Hydraulic {4}
90.57		.~.~.~.~.~ Vent or bleed means for pressure chamber

DEFINITION

Classification: 123/90.57

(under subclass 90.55) Device wherein the reciprocating hydraulic adjusting means has a fluid vent from its pressure chamber.

(1) Note. This characteristic is in contrast with the provision of such an outlet from the reservoir, which is relatively common.

(2) Note. The presence of an anti-pump-up provision may be indicated where the medium vented is a liquid; the venting of a gas, on the other hand, indicates merely a provision to maintain the hydraulic fluid in a noncompressible (liquid) state.