US PATENT SUBCLASS 417 / 212
CONDITION RESPONSIVE CONTROL OF DRIVE TRANSMISSION OR PUMP DISPLACEMENT

Current as of: June, 1999
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417 /   HD   PUMPS

212CONDITION RESPONSIVE CONTROL OF DRIVE TRANSMISSION OR PUMP DISPLACEMENT {7}
213  DF  .~> Having condition responsive pumped fluid control
214  DF  .~> Having means to hold or resist movement of pumping element
215  DF  .~> By changing phasing of plural pistons in single chamber
216  DF  .~> Plural pumps with individual or relative control
217  DF  .~> Reversible flow pump
218  DF  .~> Adjustable cam or linkage {3}
223  DF  .~> Disconnectable drive element (e.g., clutch, belt, shifter, etc.)

DEFINITION

Classification: 417/212

(under the class definition) Apparatus in which the pump or means for transmitting motion to the pump from a source of power is provided with control means for either (1) interrupting motion of the pump (e.g., clutch, lock, etc.), (2) varying the rate of motion of the pump (e.g., brake, dashpot, adjustable gearing, etc.), or (3) changing the swept volume of the pumping member of an expansible chamber-type pump (e.g., stroke control); said control means being operable in response to a sensed condition of the pump or pumped fluid.

SEE OR SEARCH THIS CLASS, SUBCLASS:

211.5, for liquid level responsive control of pump displacement, volumetric capacity or drive transmission.

274, for means for varying the volumetric capacity of an expansible chamber-type pump in response to a sensed condition, the capacity varying means not affecting pumping member displacement (e.g., clearance control).