US PATENT SUBCLASS 91 / 472
THREE OR MORE CYLINDERS ARRANGED IN PARALLEL RADIAL OR CONICAL RELATIONSHIP WITH ROTARY TRANSMISSION AXIS

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

472THREE OR MORE CYLINDERS ARRANGED IN PARALLEL RADIAL OR CONICAL RELATIONSHIP WITH ROTARY TRANSMISSION AXIS {10}
473  DF  .~> Condition responsive control of drive transmission
474  DF  .~> Separate fluid supply or discharge paths
475  DF  .~> Having yieldable drive transmission
476  DF  .~> Separate motive fluid control for each working chamber {4}
482  DF  .~> Means varies cyclic relation between reciprocating member and control valve therefor {1}
484  DF  .~> Control valve seating surface contact maintained by fluid pressure bias {1}
486  DF  .~> Motive fluid bypass to or from assembly {3}
490  DF  .~> Motive fluid supply or discharge through piston
491  DF  .~> Radially disposed cylinders {6}
499  DF  .~> Cylinders parallel to rotation axis {6}

DEFINITION

Classification: 91/472

(under the class definition) Apparatus comprising three or more cylinders each cylinder being provided with a relatively reciprocating piston (includes diaphragm) to thereby form a plurality of working chambers, the cylinders or a transmission element in common operative engagement with said cylinders or pistons being adapted to rotate about a fixed axis; said cylinders being physically arranged in a manner such that their longitudinal axes either (1) intersect at a common point or (2) extend parallel to said axis of rotation.

(1) Note. See note in class 417, Pumps, subclass 269 for a statement of the line between this class and Class 417 regarding plural cylinder devices of the above stated type.

(2) Note. Since all devices having three or more cylinders arranged in the above defined relationship are intended to be included under this definition regardless of whether the disclosure or claims are directed to a pump or a motor, provided the device is in fact capable of operation as a motor, such terminology as "motive fluid", "working member" and "working chamber", as used in this definition or those

indented hereunder, should be construed as equally applicable to pumping apparatus and synonymous with the terms, "pumped fluid", "pumping member" and "pumping chamber", respectively.

(3) Note. The recital in the claims of a plurality of cylinders is sufficient to cause classification under this definition if the claimed device has a disclosure of three or more cylinders arranged in the above defined relationship. However, the specific designation in the claims of only one or a pair of three or more disclosed cylinders precludes classification under this definition and would be classified elsewhere in the class (e.g., subclasses 243+, if of the moving cylinder type).

(4) Note. To fall within the scope of this definition the motor must be of the type which includes at least three cylinders and none of said three may be formed integral with the relatively reciprocating piston of another.

SEE OR SEARCH THIS CLASS, SUBCLASS: 6.5, for motors having three or more cylinders arranged in parallel, radial, or conical relationship with a rotary transmission axis and in which motive fluid is supplied to at least one of said cylinders through diverse flow paths.

SEE OR SEARCH CLASS

74, Machine Element or Mechanism, appropriate subclasses, for mechanical motion converting devices having no motive fluid valving or porting claimed and see especially

22, for apparatus for converting rotary motion to reciprocating and rotary motion and subclass 55 for apparatus employing a cam and slide for converting rotary motion to or from reciprocating or oscillating motion.

92, Expansible Chamber Devices, appropriate subclasses, for expansible chamber devices having plural parallel, radial, or conically arranged cylinders in which there is no valving of motive fluid claimed. The mere recital of a ported element or housing which cooperates with or surrounds the cylinders is sufficient to exclude classification in Class 92 if, by disclosure, the element or housing cooperates with the cylinders to perform a valving function. See especially the following subclasses: 12.1+, for displacement control of plural cylinders arranged in parallel, radial, or conical relationship with a rotary transmission axis; 56+, for plural rotating cylinders; 68+, for relatively movable working members interconnected with a common rotatable shaft; and 146+, for plural unitarily mounted cylinders.

417, Pumps,

269+, for pumps having three or more cylinders arranged in parallel, radial, or conical relationship with a rotary

transmission axis.