US PATENT SUBCLASS 91 / 216 R
.~ Cylinder and piston have relative reciprocation on fixed axis

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

196  DF  MOVING CYLINDER {4}
216 R.~ Cylinder and piston have relative reciprocation on fixed axis {3}
217  DF  .~.~> Reciprocating piston and cylinder
216 A  DF  .~.~> Moving cylinder having follow-up
216 B  DF  .~.~> Cyclical moving cylinder

Unofficial Alpha Subclasses: R A B

DEFINITION

Classification: 91/216

(under subclass 196) Apparatus in which the cylinder has a piston therein, the cylinder having absolute movement back and forth in a fixed straight line.

(1) Note. This definition does not include motors in which

the relative movement between the piston and cylinder includes any motion other than rectilinear reciprocation unless the additional relative movement is merely for the purpose of valving.

SEE OR SEARCH THIS CLASS, SUBCLASS:

167+, for expansible chamber motors having separately controlled plural chambers extensible as a unit wherein one of the chambers may be formed by a moving cylinder.