US PATENT SUBCLASS 417 / 437
EXPANSIBLE CHAMBER TYPE

Current as of: June, 1999
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417 /   HD   PUMPS

437EXPANSIBLE CHAMBER TYPE {40}
438  DF  .~> Liquid coolant introduced into gas pump chamber or inlet
439  DF  .~> Having additional chamber intake connection from nonpumping space
440  DF  .~> Having separate noncyclic valve (e.g., bypass, etc.) {1}
442  DF  .~> Selectively usable plural inlet or outlet distributors for single chamber
443  DF  .~> Pressure responsive distributor opened responsive to pumping member position {1}
446  DF  .~> Having means for holding pressure responsive distributor open
447  DF  .~> Pressure responsive distributor continuously biased open
448  DF  .~> Pump mounted in vertical tubular flow conduit removable as unit by driving rod manipulation {2}
451  DF  .~> Valve element mounted in fixed chamber wall removable with pumping member {1}
454  DF  .~> Including valve assembly, disassembly, or inspection facilitating means
455  DF  .~> Having valve parts relatively moved for nonvalving function
456  DF  .~> Relatively movable serial distributors {2}
460  DF  .~> Moving cylinder {7}
470  DF  .~> Biasing means effects induction stroke of abutment driven, vacuum producing pumping member
471  DF  .~> Biasing means effects eduction stroke of abutment driven, pressure producing pumping member
472  DF  .~> Bellows-type chamber {1}
474  DF  .~> Elongated flexible chamber wall progressively deformed {2}
478  DF  .~> Inlet and discharge distributors at opposite ends of tubular flexible wall pumping chamber
479  DF  .~> Distributor formed from integral portion of flexible wall pumping member
480  DF  .~> Valve in collapsible wall pumping member
481  DF  .~> Oscillating pumping member {2}
485  DF  .~> Delivery to different ports on successive strokes
486  DF  .~> Plural pumping members in single pump chamber {1}
489  DF  .~> Control by withdrawal or tilting of pump piston relative to cylinder
490  DF  .~> Pumping member position controlled port {8}
502  DF  .~> Multiple cyclic outlet paths
503  DF  .~> Multiple cyclic inlet paths
504  DF  .~> Plural outlet paths to single discharge line acting under different conditions
505  DF  .~> Electrically or magnetically actuated distributor
506  DF  .~> Distributor movement adjustable
507  DF  .~> Distributor moved by separate fluid responsive surface {1}
509  DF  .~> Distributor part forms traversed movable pump chamber wall portion
510  DF  .~> Mechanically actuated distributor {5}
521  DF  .~> Plural pumping chambers {7}
540  DF  .~> Having pulsation dampening fluid receiving space {3}
545  DF  .~> Valved piston {7}
555.1  DF  .~> Fluid serially moved to opposite side of pumping member {2}
557  DF  .~> Pump chamber in constant communication with inlet or discharge conduit
558  DF  .~> First distributor includes passage controlled by second distributor (i.e., inlet and outlet)
559  DF  .~> Having pumping chamber pressure responsive distributor {8}

DEFINITION

Classification: 417/437

(under the class definition) Apparatus comprising a chamber having a wall portion or pumping member movable to effect a change in volume of said chamber and means to control the flow of pump fluid into or out of said chamber.

(1) Note. The term distributor as used in the titles and definitions under this subclass is defined as a means which comprises or includes a part which is movable relative to the pumping member of an expansible chamber-type pump to control a pump fluid port or passage in such a manner as to

cyclically control supply or discharge of pump fluid to or from the pump.

(2) Note. Collected in this subclass are original copies of patents directed to expansible chamber-type pumps in which the means for controlling flow of pump fluid into or out of the pump chamber is selectively controlled by a human operator (e.g., manually operated valve, finger obturated port), it being necessary for the operator to operate said fluid control means during each complete cycle of expansion and contraction of the pump chamber to enable the pump to perform its pumping function.