US PATENT SUBCLASS 417 / 269
THREE OR MORE CYLINDERS ARRANGED IN PARALLEL, RADIAL, OR CONICAL RELATIONSHIP WITH ROTARY TRANSMISSION AXIS

Current as of: June, 1999
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417 /   HD   PUMPS

269THREE OR MORE CYLINDERS ARRANGED IN PARALLEL, RADIAL, OR CONICAL RELATIONSHIP WITH ROTARY TRANSMISSION AXIS {4}
270  DF  .~> Condition responsive fluid control
271  DF  .~> Motor driven
272  DF  .~> Continuous unidirectional fluid bias on reciprocating member
273  DF  .~> Radial cylinders

DEFINITION

Classification: 417/269

(under the class definition) Apparatus in which the pump comprises three or more cylinders, each cylinder being provided with a relatively reciprocating piston (include diaphragm) to thereby form a plurality of pumping 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. Devices having three or more cylinders arranged in the above defined relationship are intended to be included hereunder only in those instances where the disclosed structure limits the device to a pumping function (e.g., check valve control of admission or discharge of pump fluid to or from the cylinders) or has structure claimed which has utility only in a pumping operation. Therefore, plural cylinder devices of this arrangement which are in fact capable of operation as a motor and which have no features claimed of sole pump utility are classified in Class 91, Motors: Expansible Chamber Type, regardless of whether they are disclosed and claimed generically or solely as pump or motor. However, intended to be classified in this class are plural cylinder devices of the above defined type which are disclosed solely or claimed solely as a pump and which in addition claim means separate from the pump for sensing a condition (excludes direct response via pumping member) to effect control of either (1) the pumped fluid (see subclass 270, indented hereunder) or (2) the pump drive transmission (see subclasses 212+). Also, plural cylinder devices of this type having a significantly claimed motor drive therefor are intended to be classified in this class (see subclass 271, indented hereunder) provided the claims do not reflect control of the drive in response to a sensed pump condition which would cause classification in subclasses 1+.

(2) 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 CLASS

74, Machine Element or Mechanism, appropriate subclasses, for mechanical motion converting apparatus having no pump 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. 91, Motors: Expansible Chamber Type,

472+, for three or more cylinders arranged in parallel, radial, or conical relationship with a rotary transmission axis and which are generic to operation as either a pump or a motor. See note above for the distinction between this subclass and subclasses 472+ in Class 91.

92, Expansible Chamber Devices, appropriate subclasses, for expansible chamber devices having plural parallel, radial, or

conical arranged cylinders in which there is no valving of the pumped fluid claimed and see especially

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.