US PATENT SUBCLASS 417 / 460
.~ Moving cylinder

Current as of: June, 1999
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417 /   HD   PUMPS

437  DF  EXPANSIBLE CHAMBER TYPE {40}
460.~ Moving cylinder {7}
461  DF  .~.~> Cylinder rotates or oscillates about longitudinal axis
462  DF  .~.~> Unidirectionally rotating cylinder {1}
464  DF  .~.~> Cylinder oscillates about axis transverse to longitudinal axis {1}
466  DF  .~.~> Inlet or discharge controlled by cooperating port in reciprocating cylinder and fixed member
467  DF  .~.~> Relatively movable cylinders
468  DF  .~.~> Having integral pump piston or external pumping face
469  DF  .~.~> Cylinder and piston reciprocate on common axis

DEFINITION

Classification: 417/460

(under subclass 437) Apparatus in which the expansible chamber pump comprises a cylinder having a piston (includes diaphragm) movable therein and in which incident to the operation of the pump, the cylinder has an absolute movement.

(1) Note. Those pumps in which it involves an obvious matter of choice or reversal of parts whether the piston is stationary and the cylinder movable or vice versa will not be classified under this definition even if the claims identify the cylinder as the movable element. However, where the claims set forth a specific power transmission element (e.g., crank) for moving the cylinder, classification under this definition results.

(2) Note. An open ended cylindrical member or sleeve in which the piston reciprocates and which has an absolute sliding, rotary, or oscillating motion on its longitudinal axis is not considered to be a moving cylinder under this definition and is classified in subclass 509, below. However, if the cylindrical member carries or has formed as a part thereof the end wall of the expansible chamber (i.e., abutment) it is considered to be a cylinder and is included under this definition even if the sole disclosed purpose of the sliding, rotating, or oscillatory movement is for valving pumped fluid.

(3) Note. A cylinder which has an absolute reciprocating, rotary or oscillatory motion on an axis other than the longitudinal axis thereof is included under this definition even if the sole disclosed purpose of such motion is for the valving of pumped fluid and regardless of whether the cylinder forms a portion of the chamber end wall (e.g., the entire abutment surface for the pumped fluid may be provided by a stationary valve element).

SEE OR SEARCH THIS CLASS, SUBCLASS:

269, for pumps having three or more cylinders arranged in parallel, radial, or conical relationship with a rotary transmission axis which cylinders may move incident to the operation of the pump. 449, for a pump mounted in a vertical tubular flow conduit removable as a unit by driving rod manipulation and having a fixed piston and moving cylinder.

457, for an expansible chamber-type pump having serially arranged distributors for controlling inlet or discharge of pump fluid wherein one of the distributors is formed in part by a moving cylinder having a port cooperating with a stationary ported member.

SEE OR SEARCH CLASS

91, Motors: Expansible Chamber Type,

472+, for motors or pumps having three or more parallel or radially arranged cylinders which may move incident to operation of the motor or pump and subclasses 196+ for an expansible chamber-type motor or a device disclosed and claimed generically as a pump or motor which has a moving cylinder.

92, Expansible Chamber Devices,

117+, for cylinders mounted for movement incident to expansion or contraction of the expansible chamber.