US PATENT SUBCLASS 91 / 6
FLUID SUPPLY THROUGH DIVERSE PATHS TO SINGLE EXPANSIBLE CHAMBER

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

6FLUID SUPPLY THROUGH DIVERSE PATHS TO SINGLE EXPANSIBLE CHAMBER {12}
6.5  DF  .~> Three or more cylinders arranged in parallel, radial or conical relationship with rotary transmission axis
7  DF  .~> Selective cyclic and noncyclic operation or parking
8  DF  .~> Semi-compound type {2}
11  DF  .~> Changeable from multiple expansion to simple operation
12  DF  .~> Cyclically operable motor with port reversing {3}
16  DF  .~> Drifting or coasting on lower pressure {2}
19  DF  .~> Diverse paths used to control extent of working member travel
20  DF  .~> Position responsive {4}
28  DF  .~> Second path activated in response to pressure or flow in first path {1}
30  DF  .~> Serially arranged reversing valves
31  DF  .~> One path includes restriction
32  DF  .~> Activation of one path disables second path {1}

DEFINITION

Classification: 91/6

(under the class definition) Apparatus in which a working chamber of the motor is provided with inlet motive fluid which is supplied from different sources at different times or flows through supply paths that are different at the will of the operator or under different operating conditions so as to supply force to act on the same face of the working member at different times.

(1) Note. The supply paths are considered to be different under this definition if the motive fluid flows through one path at one time and flows through the same path and additionally through another path at another time.

(2) Note. Different positions of the motor working member are considered to be different operating conditions under this definition.

(3) Note. Inlet motive fluid under this definition is considered to be any fluid supplied to the expansible chamber during expansion thereof for the purpose of driving the working member. Also, motive fluid which is admitted to a contracting chamber to cushion the working member prior to admission of motive fluid to expand the chamber is also considered to be inlet motive fluid.

SEE OR SEARCH THIS CLASS, SUBCLASS:

282+, for cyclically operable expansible chamber motors having a fluid actuated distributor with fluid supplied to the distributor motor through diverse flow paths.

436, for expansible chamber motors in which inlet fluid to an expanding working chamber is selectively supplemented by fluid pressurized in the contracting chamber. 441, for expansible chamber motors in which a valve is provided to permit ambient fluid to be drawn into a working chamber thereof as, for example, when the load is moving the

working member to expand the chamber faster than inlet fluid can be supplied.

464, for double acting expansible chamber motors having means to simultaneously open opposed working chambers to inlet motive fluid.

SEE OR SEARCH CLASS

60, Power Plants,

563+, for pulsator systems in which the normally constant mass of motive fluid confined between pump and motor chambers of a pulsator system is increased by the addition of pressurized motive fluid from a valve-controlled motive fluid supply means so that the motor is supplied with motive fluid from diverse flow paths. Inclusion of any details of the pulsator pump, for example, reciting the piston or even reciting broadly the type of pump (e.g., "pulsator pump") is sufficient to cause classification in Class 60 although patents merely reciting a "pump" will be classified in Class 91, subclasses 6+ even where the pump is disclosed as being a pulsator type. It is to be noted that a pair of pistons of the same size in the same uniform diameter cylinder with a confined body of fluid therebetween is not a pulsator system, but is considered to be a mere transmission or two piece piston and does not preclude classification of a patent in Class 91. The combination of two pistons in the same cylinder with an additional, controlled supply of motive fluid to the space therebetween, is construed as a means to vary the size of the piston and thus limit the stroke or alternatively, as a Class 91 type working chamber which, after expansion, is filled with locked up fluid which may constitute a fluid link transmission to transmit the output of another working member. See, for example, subclasses 167+ of Class 91. Also see section C of (4) Note of the class definition of Class 91; and subclasses 17+, 51+ and 57+ for specific pumps which form diverse paths and sources of pressurized fluid for a Class 91 motor. See (4) Note under the class definition of Class 91 defining the degree of specificity of the pump which results in classification of Class 60.