US PATENT SUBCLASS 251 / 233
.~.~ Leverage variable during operation


Current as of: June, 1999
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251 /   HD   VALVES AND VALVE ACTUATION

213  DF  MECHANICAL MOVEMENT ACTUATOR {10}
231  DF  .~ Lever {5}
233.~.~ Leverage variable during operation


DEFINITION

Classification: 251/233

(under subclass 231) Subject matter wherein the lever is so arranged that its effective length varies as the lever swings through its actuating range, to vary the relation between effective force and the resistance of the actuated valve at various stages of its movement.

SEE OR SEARCH THIS CLASS, SUBCLASS:

237+, for levers having sliding contact wherein there is no appreciable mechanical advantage obtained by the sliding contact.

SEE OR SEARCH CLASS

137, Fluid Handling,

531, for valves having direct response to condition change in which a reciprocating valve has a variable lever arm biasing means.