US PATENT SUBCLASS 91 / 222
.~ Distributor in piston (422)

Current as of: June, 1999
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91 /   HD   MOTORS: EXPANSIBLE CHAMBER TYPE

218  DF  CYCLICALLY OPERABLE {34}
222.~ Distributor in piston (422) {6}
223  DF  .~.~> Oscillating piston (e.g., vane)
224  DF  .~.~> Distributor establishes communication between opposite faces of piston
225  DF  .~.~> Piston traverses pilot port to control distributor motor motive fluid
226  DF  .~.~> Communication into piston through peripheral port {1}
228  DF  .~.~> Piston carries separate inlet and exhaust valves
229  DF  .~.~> Distributor operated by abutment with cylinder head

DEFINITION

Classification: 91/222

(under subclass 218) Apparatus in which a passage is provided entirely within the piston or piston rod for inlet or exhaust of motive fluid and a distributor movable relative to both the piston and cylinder is carried by the piston or piston rod and controls said passage.

SEE OR SEARCH THIS CLASS, SUBCLASS:

49, for expansible chamber motors having constantly applied motive fluid with controlled venting, in which the fluid is vented through the working member.

312, for cyclically operable motors having working member controlled motive fluid for a distributor motor, in which the distributor motor may include a valve piston.

422, for noncyclically operable motors having a valved piston.

SEE OR SEARCH CLASS

73, Measuring and Testing, 248, for expansible chamber type volume or rate of flow meters having a valved piston.